Style and security

Added tests, revised logging

Removed dependency on env file

Try reformatting unit file

Comments clarification

Added readme

Added readme

.cursor/rules/snyk_rules.mdc

@@ -0,0 +1,14 @@
+---
+alwaysApply: true
+always_on: true
+trigger: always_on
+applyTo: "**"
+description: Snyk Security At Inception
+---
+
+# Project security best practices
+
+- Always run snyk_code_scan tool for new first party code that is generated in a Snyk-supported language.
+- If any security issues are found based on newly introduced or modified code or dependencies, attempt to fix the issues using the results context from Snyk.
+- Rescan the code after fixing the issues to ensure that the issues were fixed and that there are no newly introduced issues.
+- Repeat this process until no new issues are found.

.github/workflows/go-ci.yaml

@@ -7,18 +7,38 @@ on:
     branches: [ main ]
 
 jobs:
+  # Common setup job that other jobs can depend on
+  setup:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version: '1.26.0'
+      - uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cache/go-build
+            ~/go/pkg/mod
+          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+          restore-keys: |
+            ${{ runner.os }}-go-
+      - run: go mod tidy
+
   # Lint job
   lint:
+    needs: setup
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
       - uses: golangci/golangci-lint-action@v9
         with:
-          version: v2.12.2
+          version: v2.10
           args: --timeout 5m
 
   # Test job
   test:
+    needs: setup
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
@@ -29,9 +49,10 @@ jobs:
 
   # Security scan job
   security:
+    needs: setup
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
-      - uses: securego/gosec@v2.26.1
+      - uses: securego/gosec@master
         with:
           args: ./...

.gitignore

@@ -15,4 +15,4 @@ bot.db
 
 # All config files except for the default
 config/*
-!config/default.json
+!config/default.json

.roo/mcp.json

@@ -0,0 +1,3 @@
+{
+  "mcpServers": {}
+}

README.md

@@ -4,8 +4,7 @@ A scalable, multi-bot solution for Telegram using Go, GORM, and the Anthropic AP
 
 ## Design Considerations
 
-- AI-powered (Anthropic Claude)
-- Voice message support (ElevenLabs STT + TTS) — optional, enabled per bot via config
+- AI-powered
 - Supports multiple bot profiles
 - Uses SQLite for persistence
 - Implements rate limiting and user management
@@ -52,40 +51,6 @@ A scalable, multi-bot solution for Telegram using Go, GORM, and the Anthropic AP
    go build -o telegram-bot
    ```
 
-## Trying Out New Behavior Safely
-
-Want to experiment with a different personality, tone, or set of instructions without disturbing the bot your users already talk to? Run a second, separate bot just for testing.
-
-Each bot profile is its own config file with its own Telegram token, and bots are fully independent — separate identity, separate chat history, separate settings. So a "test twin" is quick to set up:
-
-1. Create a new bot with [@BotFather](https://t.me/BotFather) and copy its token.
-2. Copy your existing config to a new file, e.g. `cp config/mybot.json config/mybot-test.json`.
-3. In the new file, paste the new token, give it a different `id`, and edit `system_prompts` to try your changes.
-4. Start it alongside your main bot. Chat with the test bot, tweak its prompt, and restart the test bot to try again — your real users never see the experiments.
-5. Happy with the result? Copy the same change into your main bot's config and restart it.
-
-> [!NOTE]
-> A test bot always needs its **own** token. Telegram only lets one running bot listen on a given token, so you can't point a second copy at your live bot — give the twin its own @BotFather bot instead.
-
-## Configuration
-
-Each bot is one JSON file in `config/` (see `config/default.json` for the template). Keys of note:
-
-| Key                | Type   | Default     | Description |
-| ------------------ | ------ | ----------- | ----------- |
-| `max_tokens`       | number | `1000`      | Maximum output tokens per reply. **Thinking tokens count toward this limit** — raise it (e.g. `4000`+) whenever `thinking` is `"adaptive"`, or a turn can spend the whole budget on reasoning and produce no text. |
-| `thinking`         | string | *(omitted)* | Reasoning mode: `"adaptive"` (the model decides when and how much to think) or `"disabled"`. Omit the key entirely to use the model's own API default. If the configured model doesn't support the chosen mode, the API rejects the request with a 400 — owners/admins see the raw error, regular users get the generic fallback. Check [Anthropic's model docs](https://platform.claude.com/docs/en/build-with-claude/adaptive-thinking) for per-model support. |
-| `thinking_display` | string | *(omitted)* | `"summarized"` or `"omitted"`. Only valid together with `"thinking": "adaptive"`. Controls whether the API returns a readable summary of the reasoning (logged, never sent to chat). Thinking is billed the same either way; when omitted, the API's per-model default applies. |
-
-Every reply logs one accounting line — `[usage] model=... in=... out=... thinking=... stop=...` — so thinking spend (billed even when its text is omitted) stays visible in `journalctl`/`docker compose logs`. A `stop=max_tokens` line is accompanied by an error-level warning that the reply was truncated.
-
-> [!TIP]
-> For deep request/response debugging, the Anthropic Go SDK ships `option.WithDebugLog(...)` (dumps full HTTP bodies with auth headers redacted). It is not wired into the bot — dev-only, add it temporarily to the client constructor if you ever need wire-level traces.
-
-### Future: persistent memory
-
-The Anthropic memory tool (`memory_20250818`) is a candidate future feature for cross-conversation recall (a self-hosted analog of ChatGPT's "memory"). The Go SDK already ships the types (`BetaMemoryTool20250818Param` and its tool-union slot plus the six-command union: `view`/`create`/`str_replace`/`insert`/`delete`/`rename`), but — unlike the Python/TypeScript/Java SDKs — provides **no handler helper**: the bot would have to hand-write client-side command dispatch against per-chat storage, including strict path validation (canonicalize and confine every model-supplied path under a fixed memory root; reject `..`/symlink traversal) and a no-secrets policy for stored content. Not implemented yet.
-
 ## Systemd Unit Setup
 
 To enable the bot to start automatically on system boot and run in the background, set up a systemd unit.

album_buffer.go

@@ -1,88 +0,0 @@
-package main
-
-import (
-	"context"
-	"sort"
-	"time"
-
-	"github.com/go-telegram/bot/models"
-)
-
-const albumFlushWindow = 1 * time.Second
-
-type pendingAlbum struct {
-	items                                       []*models.Message
-	chatID, userID                              int64
-	username, firstName, lastName, languageCode string
-	isPremium                                   bool
-	messageTime                                 int
-	businessConnectionID                        string
-	timer                                       *time.Timer
-}
-
-func (b *Bot) bufferAlbumItem(
-	ctx context.Context,
-	msg *models.Message,
-	chatID, userID int64,
-	username, firstName, lastName string,
-	isPremium bool,
-	languageCode string,
-	messageTime int,
-	businessConnectionID string,
-) {
-	b.albumBuffersMu.Lock()
-	defer b.albumBuffersMu.Unlock()
-
-	album, exists := b.albumBuffers[msg.MediaGroupID]
-	if !exists {
-		album = &pendingAlbum{
-			chatID:               chatID,
-			userID:               userID,
-			username:             username,
-			firstName:            firstName,
-			lastName:             lastName,
-			isPremium:            isPremium,
-			languageCode:         languageCode,
-			messageTime:          messageTime,
-			businessConnectionID: businessConnectionID,
-		}
-		b.albumBuffers[msg.MediaGroupID] = album
-	}
-	album.items = append(album.items, msg)
-
-	if album.timer != nil {
-		album.timer.Stop()
-	}
-	mediaGroupID := msg.MediaGroupID
-	album.timer = time.AfterFunc(albumFlushWindow, func() {
-		b.flushAlbum(ctx, mediaGroupID)
-	})
-}
-
-func (b *Bot) flushAlbum(ctx context.Context, mediaGroupID string) {
-	b.albumBuffersMu.Lock()
-	album, exists := b.albumBuffers[mediaGroupID]
-	if !exists {
-		b.albumBuffersMu.Unlock()
-		return
-	}
-	delete(b.albumBuffers, mediaGroupID)
-	items := album.items
-	captured := *album
-	b.albumBuffersMu.Unlock()
-
-	sort.Slice(items, func(i, j int) bool { return items[i].ID < items[j].ID })
-
-	if !b.checkRateLimits(captured.userID) {
-		b.sendRateLimitExceededMessage(ctx, captured.chatID, captured.businessConnectionID)
-		return
-	}
-
-	b.handlePhotoMessage(
-		ctx, items,
-		captured.chatID, captured.userID,
-		captured.username, captured.firstName, captured.lastName,
-		captured.isPremium, captured.languageCode, captured.messageTime,
-		captured.businessConnectionID,
-	)
-}

anthropic.go

@@ -4,333 +4,137 @@ import (
 	"context"
 	"errors"
 	"fmt"
-	"net/http"
 	"strings"
-	"sync/atomic"
 	"time"
 
-	"github.com/anthropics/anthropic-sdk-go"
-	"github.com/anthropics/anthropic-sdk-go/packages/param"
+	"github.com/liushuangls/go-anthropic/v2"
 )
 
+// ErrModelNotFound is returned when the configured Anthropic model is no longer available
+// (deprecated or removed). Callers can use errors.Is to detect this and surface an
+// actionable message to admins/owners while keeping the response vague for regular users.
 var ErrModelNotFound = errors.New("model not found or deprecated")
 
-const maxFileNotFoundRetries = 3
+func (b *Bot) getAnthropicResponse(ctx context.Context, messages []anthropic.Message, isNewChat, isOwner, isEmojiOnly bool, username string, firstName string, lastName string, isPremium bool, languageCode string, messageTime int) (string, error) {
+	// Use prompts from config
+	var systemMessage string
+	if isNewChat {
+		systemMessage = b.config.SystemPrompts["new_chat"]
+	} else {
+		systemMessage = b.config.SystemPrompts["continue_conversation"]
+	}
 
-const defaultMaxTokens = 1000
+	// Combine default prompt with custom instructions
+	systemMessage = b.config.SystemPrompts["default"] + " " + b.config.SystemPrompts["custom_instructions"] + " " + systemMessage
 
-const mcpUnsupportedSentinel = "format not currently supported by the Anthropic API"
+	// Handle username placeholder
+	usernameValue := username
+	if username == "" {
+		usernameValue = "unknown" // Use "unknown" when username is not available
+	}
+	systemMessage = strings.ReplaceAll(systemMessage, "{username}", usernameValue)
 
-var mcpUnsupportedCount atomic.Uint64
+	// Handle firstname placeholder
+	firstnameValue := firstName
+	if firstName == "" {
+		firstnameValue = "unknown" // Use "unknown" when first name is not available
+	}
+	systemMessage = strings.ReplaceAll(systemMessage, "{firstname}", firstnameValue)
 
-type mcpCall struct{ server, name, input string }
+	// Handle lastname placeholder
+	lastnameValue := lastName
+	if lastName == "" {
+		lastnameValue = "" // Empty string when last name is not available
+	}
+	systemMessage = strings.ReplaceAll(systemMessage, "{lastname}", lastnameValue)
 
-func (b *Bot) getAnthropicResponse(ctx context.Context, chatID int64, messages []anthropic.BetaMessageParam, isEmojiOnly bool, username string, firstName string, lastName string, isPremium bool, languageCode string, messageTime int, onSegment func(string) error) (string, error) {
-	staticPrompt := strings.TrimSpace(b.config.SystemPrompts["custom_instructions"])
+	// Handle language code placeholder
+	langValue := languageCode
+	if languageCode == "" {
+		langValue = "en" // Default to English when language code is not available
+	}
+	systemMessage = strings.ReplaceAll(systemMessage, "{language}", langValue)
 
+	// Handle premium status
+	premiumStatus := "regular user"
+	if isPremium {
+		premiumStatus = "premium user"
+	}
+	systemMessage = strings.ReplaceAll(systemMessage, "{premium_status}", premiumStatus)
+
+	// Handle time awareness
+	timeObj := time.Unix(int64(messageTime), 0)
+	hour := timeObj.Hour()
+	var timeContext string
+	if hour >= 5 && hour < 12 {
+		timeContext = "morning"
+	} else if hour >= 12 && hour < 18 {
+		timeContext = "afternoon"
+	} else if hour >= 18 && hour < 22 {
+		timeContext = "evening"
+	} else {
+		timeContext = "night"
+	}
+	systemMessage = strings.ReplaceAll(systemMessage, "{time_context}", timeContext)
+
+	if !isOwner {
+		systemMessage += " " + b.config.SystemPrompts["avoid_sensitive"]
+	}
+
+	if isEmojiOnly {
+		systemMessage += " " + b.config.SystemPrompts["respond_with_emojis"]
+	}
+
+	// Debug logging
 	InfoLogger.Printf("Sending %d messages to Anthropic", len(messages))
-
-	maxTokens := int64(defaultMaxTokens)
-	if b.config.MaxTokens > 0 {
-		maxTokens = int64(b.config.MaxTokens)
+	for i, msg := range messages {
+		for _, content := range msg.Content {
+			if content.Type == anthropic.MessagesContentTypeText {
+				InfoLogger.Printf("Message %d: Role=%v, Text=%v", i, msg.Role, content.Text)
+			}
+		}
 	}
-	params := anthropic.BetaMessageNewParams{
-		Model:     b.config.Model,
-		MaxTokens: maxTokens,
+
+	// Ensure the roles are correct
+	for i := range messages {
+		switch messages[i].Role {
+		case anthropic.RoleUser:
+			messages[i].Role = anthropic.RoleUser
+		case anthropic.RoleAssistant:
+			messages[i].Role = anthropic.RoleAssistant
+		default:
+			// Default to 'user' if role is unrecognized
+			messages[i].Role = anthropic.RoleUser
+		}
+	}
+
+	model := anthropic.Model(b.config.Model)
+
+	// Create the request
+	request := anthropic.MessagesRequest{
+		Model:     model, // Now `model` is of type anthropic.Model
 		Messages:  messages,
-		Betas:     []anthropic.AnthropicBeta{anthropic.AnthropicBetaFilesAPI2025_04_14},
-	}
-
-	if staticPrompt != "" {
-		blocks := []anthropic.BetaTextBlockParam{
-			{Text: staticPrompt, CacheControl: anthropic.NewBetaCacheControlEphemeralParam()},
-		}
-		tail := buildUserContext(username, firstName, lastName, isPremium, languageCode, messageTime)
-		if isEmojiOnly {
-			if rule := strings.TrimSpace(b.config.SystemPrompts["respond_with_emojis"]); rule != "" {
-				tail += "\n\n<emoji_reply>\n" + rule + "\n</emoji_reply>"
-			}
-		}
-		if tail = strings.TrimSpace(tail); tail != "" {
-			blocks = append(blocks, anthropic.BetaTextBlockParam{Text: tail})
-		}
-		params.System = blocks
+		System:    systemMessage,
+		MaxTokens: 1000,
 	}
 
+	// Apply temperature if set in config
 	if b.config.Temperature != nil {
-		params.Temperature = param.NewOpt(float64(*b.config.Temperature))
+		request.Temperature = b.config.Temperature
 	}
 
-	if thinking, ok := thinkingParamFromConfig(b.config.Thinking, b.config.ThinkingDisplay); ok {
-		params.Thinking = thinking
-	}
-
-	if len(b.config.MCPServers) > 0 {
-		mcpServers := make([]anthropic.BetaRequestMCPServerURLDefinitionParam, 0, len(b.config.MCPServers))
-		tools := make([]anthropic.BetaToolUnionParam, 0, len(b.config.MCPServers))
-		for _, s := range b.config.MCPServers {
-			srv := anthropic.BetaRequestMCPServerURLDefinitionParam{
-				Name: s.Name,
-				URL:  s.URL,
-			}
-			if s.AuthorizationToken != "" {
-				srv.AuthorizationToken = param.NewOpt(s.AuthorizationToken)
-			}
-			mcpServers = append(mcpServers, srv)
-
-			toolset := &anthropic.BetaMCPToolsetParam{
-				MCPServerName: s.Name,
-			}
-			if len(s.AllowedTools) > 0 {
-				toolset.DefaultConfig = anthropic.BetaMCPToolDefaultConfigParam{
-					Enabled: param.NewOpt(false),
-				}
-				toolset.Configs = make(map[string]anthropic.BetaMCPToolConfigParam, len(s.AllowedTools))
-				for _, tool := range s.AllowedTools {
-					toolset.Configs[tool] = anthropic.BetaMCPToolConfigParam{
-						Enabled: param.NewOpt(true),
-					}
-				}
-			}
-			tools = append(tools, anthropic.BetaToolUnionParam{OfMCPToolset: toolset})
-		}
-		params.MCPServers = mcpServers
-		params.Tools = tools
-		params.Betas = append(params.Betas, anthropic.AnthropicBetaMCPClient2025_11_20)
-	}
-
-	for attempt := 0; attempt < maxFileNotFoundRetries; attempt++ {
-		joined, streamErr := b.streamMessages(ctx, params, onSegment)
-		if streamErr == nil {
-			return joined, nil
-		}
-		var apiErr *anthropic.Error
-		if !errors.As(streamErr, &apiErr) || apiErr.StatusCode != http.StatusNotFound {
-			return "", fmt.Errorf("error creating Anthropic message: %w", streamErr)
-		}
-		missingFileID := extractMissingFileID(streamErr)
-		if missingFileID == "" {
+	resp, err := b.anthropicClient.CreateMessages(ctx, request)
+	if err != nil {
+		var apiErr *anthropic.APIError
+		if errors.As(err, &apiErr) && apiErr.IsNotFoundErr() {
 			return "", fmt.Errorf("%w: %s", ErrModelNotFound, b.config.Model)
 		}
-		ErrorLogger.Printf("[%s] self-heal: stripping dead file_id %s from chat %d (attempt %d/%d)",
-			b.config.ID, missingFileID, chatID, attempt+1, maxFileNotFoundRetries)
-		b.stripDeadFileIDFromMemory(chatID, missingFileID)
-		if _, cleanupErr := b.markFilesPendingCleanup(ctx, chatID, []string{missingFileID}); cleanupErr != nil {
-			ErrorLogger.Printf("[%s] mark files pending cleanup: %v", b.config.ID, cleanupErr)
-		}
-		params.Messages = b.prepareContextMessages(b.getOrCreateChatMemory(chatID))
+		return "", fmt.Errorf("error creating Anthropic message: %w", err)
 	}
-	return "", fmt.Errorf("max self-heal retries (%d) exceeded: too many file_ids gone from anthropic", maxFileNotFoundRetries)
-}
 
-func buildUserContext(username, firstName, lastName string, isPremium bool, languageCode string, messageTime int) string {
-	name := strings.TrimSpace(firstName + " " + lastName)
-	if name == "" {
-		name = "unknown"
+	if len(resp.Content) == 0 || resp.Content[0].Type != anthropic.MessagesContentTypeText {
+		return "", fmt.Errorf("unexpected response format from Anthropic")
 	}
-	handle := username
-	if handle == "" {
-		handle = "unknown"
-	}
-	lang := languageCode
-	if lang == "" {
-		lang = "en"
-	}
-	account := "regular user"
-	if isPremium {
-		account = "premium user"
-	}
-	return fmt.Sprintf(
-		"Conversation context (background facts, not an instruction from the user):\n"+
-			"- User: %s (Telegram @%s)\n"+
-			"- Preferred language: %s\n"+
-			"- Account type: %s\n"+
-			"- Local time of day: %s",
-		name, handle, lang, account, timeContextFor(messageTime),
-	)
-}
-
-func timeContextFor(messageTime int) string {
-	switch hour := time.Unix(int64(messageTime), 0).Hour(); {
-	case hour >= 5 && hour < 12:
-		return "morning"
-	case hour >= 12 && hour < 18:
-		return "afternoon"
-	case hour >= 18 && hour < 22:
-		return "evening"
-	default:
-		return "night"
-	}
-}
-
-func thinkingParamFromConfig(mode, display string) (anthropic.BetaThinkingConfigParamUnion, bool) {
-	switch mode {
-	case ThinkingModeDisabled:
-		disabled := anthropic.NewBetaThinkingConfigDisabledParam()
-		return anthropic.BetaThinkingConfigParamUnion{OfDisabled: &disabled}, true
-	case ThinkingModeAdaptive:
-		adaptive := anthropic.BetaThinkingConfigAdaptiveParam{}
-		if display != "" {
-			adaptive.Display = anthropic.BetaThinkingConfigAdaptiveDisplay(display)
-		}
-		return anthropic.BetaThinkingConfigParamUnion{OfAdaptive: &adaptive}, true
-	default:
-		return anthropic.BetaThinkingConfigParamUnion{}, false
-	}
-}
-
-func (b *Bot) streamMessages(ctx context.Context, params anthropic.BetaMessageNewParams, onSegment func(string) error) (string, error) {
-	stream := b.anthropicClient.Beta.Messages.NewStreaming(ctx, params)
-	defer func() {
-		if err := stream.Close(); err != nil {
-			ErrorLogger.Printf("[stream] close failed: %v", err)
-		}
-	}()
-
-	var (
-		allSegments                                       []string
-		currentKind                                       string
-		currentText                                       strings.Builder
-		currentThinking                                   strings.Builder
-		currentInputJSON                                  strings.Builder
-		currentTUseName, currentTUseServer, currentTUseID string
-		currentTResultUseID, currentTResultServer         string
-		currentTResultIsError                             bool
-		currentTResultContent                             string
-		mcpCalls                                          = map[string]mcpCall{}
-		startInputTokens                                  int64
-		finalUsage                                        anthropic.BetaMessageDeltaUsage
-		stopReason                                        string
-	)
-
-	for stream.Next() {
-		e := stream.Current()
-		switch e.Type {
-		case "message_start":
-			startInputTokens = e.AsMessageStart().Message.Usage.InputTokens
-
-		case "message_delta":
-			md := e.AsMessageDelta()
-			finalUsage = md.Usage
-			if md.Delta.StopReason != "" {
-				stopReason = string(md.Delta.StopReason)
-			}
 
-		case "content_block_start":
-			cbs := e.AsContentBlockStart()
-			currentKind = cbs.ContentBlock.Type
-			currentText.Reset()
-			currentThinking.Reset()
-			currentInputJSON.Reset()
-			switch currentKind {
-			case "mcp_tool_use":
-				currentTUseName = cbs.ContentBlock.Name
-				currentTUseServer = cbs.ContentBlock.ServerName
-				currentTUseID = cbs.ContentBlock.ID
-			case "mcp_tool_result":
-				currentTResultUseID = cbs.ContentBlock.ToolUseID
-				currentTResultServer = cbs.ContentBlock.ServerName
-				currentTResultIsError = cbs.ContentBlock.IsError
-				currentTResultContent = cbs.ContentBlock.JSON.Content.Raw()
-			}
-
-		case "content_block_delta":
-			cbd := e.AsContentBlockDelta()
-			switch cbd.Delta.Type {
-			case "text_delta":
-				if currentKind == "text" {
-					currentText.WriteString(cbd.Delta.Text)
-				}
-			case "thinking_delta":
-				if currentKind == "thinking" {
-					currentThinking.WriteString(cbd.Delta.Thinking)
-				}
-			case "input_json_delta":
-				if currentKind == "mcp_tool_use" {
-					currentInputJSON.WriteString(cbd.Delta.PartialJSON)
-				}
-			}
-
-		case "content_block_stop":
-			switch currentKind {
-			case "text":
-				seg := strings.TrimSpace(currentText.String())
-				if seg != "" {
-					allSegments = append(allSegments, seg)
-					if onSegment != nil {
-						if cbErr := onSegment(seg); cbErr != nil {
-							ErrorLogger.Printf("[stream] onSegment failed: %v", cbErr)
-						}
-					}
-				}
-			case "mcp_tool_use":
-				mcpCalls[currentTUseID] = mcpCall{
-					server: currentTUseServer,
-					name:   currentTUseName,
-					input:  currentInputJSON.String(),
-				}
-				InfoLogger.Printf("[mcp] tool_use server=%q name=%q id=%q input=%s",
-					currentTUseServer, currentTUseName, currentTUseID, currentInputJSON.String())
-			case "mcp_tool_result":
-				preview := currentTResultContent
-				if len(preview) > 500 {
-					preview = preview[:500] + "...(truncated)"
-				}
-				InfoLogger.Printf("[mcp] tool_result tool_use_id=%q server=%q is_error=%v content=%s",
-					currentTResultUseID, currentTResultServer, currentTResultIsError, preview)
-				if strings.Contains(currentTResultContent, mcpUnsupportedSentinel) {
-					total := mcpUnsupportedCount.Add(1)
-					call := mcpCalls[currentTResultUseID]
-					ErrorLogger.Printf("[%s][mcp][unsupported] connector could not serialize result "+
-						"(total=%d): server=%q tool=%q input=%s tool_use_id=%q",
-						b.config.ID, total, call.server, call.name, call.input, currentTResultUseID)
-				}
-			case "thinking", "redacted_thinking":
-				if summary := strings.TrimSpace(currentThinking.String()); summary != "" {
-					if len(summary) > 500 {
-						summary = summary[:500] + "...(truncated)"
-					}
-					InfoLogger.Printf("[thinking] block complete: %s", summary)
-				} else {
-					InfoLogger.Printf("[thinking] block complete (content omitted)")
-				}
-			default:
-				if currentKind != "" {
-					InfoLogger.Printf("[mcp] block type=%q (unhandled)", currentKind)
-				}
-			}
-			currentKind = ""
-		}
-	}
-
-	if err := stream.Err(); err != nil {
-		return "", err
-	}
-
-	if stopReason != "" || finalUsage.OutputTokens > 0 {
-		inputTokens := finalUsage.InputTokens
-		if inputTokens == 0 {
-			inputTokens = startInputTokens
-		}
-		InfoLogger.Printf("[usage] model=%s in=%d out=%d thinking=%d stop=%s",
-			params.Model, inputTokens, finalUsage.OutputTokens,
-			finalUsage.OutputTokensDetails.ThinkingTokens, stopReason)
-		if stopReason == "max_tokens" {
-			ErrorLogger.Printf("[usage] response truncated at max_tokens=%d - raise max_tokens (thinking counts toward it)",
-				params.MaxTokens)
-		}
-	}
-
-	if len(allSegments) == 0 {
-		return "", emptyStreamError(stopReason, finalUsage.OutputTokensDetails.ThinkingTokens, params.MaxTokens)
-	}
-	return strings.Join(allSegments, "\n\n"), nil
-}
-
-func emptyStreamError(stopReason string, thinkingTokens, maxTokens int64) error {
-	if stopReason == "max_tokens" {
-		return fmt.Errorf("output budget exhausted before any text (thinking used %d of %d max_tokens) - raise max_tokens",
-			thinkingTokens, maxTokens)
-	}
-	return fmt.Errorf("unexpected response format from Anthropic")
+	return resp.Content[0].GetText(), nil
 }

anthropic_files.go

@@ -1,172 +0,0 @@
-package main
-
-import (
-	"bytes"
-	"context"
-	"errors"
-	"fmt"
-	"net/http"
-	"strings"
-	"time"
-
-	"github.com/anthropics/anthropic-sdk-go"
-)
-
-const fileNotFoundPrefix = "File not found: "
-
-func formatUploadFilename(botID uint, chatID int64, tgMessageID int, ext string) string {
-	return fmt.Sprintf("tg-%d-%d-%d.%s", botID, chatID, tgMessageID, ext)
-}
-
-func (b *Bot) uploadImageToAnthropic(ctx context.Context, data []byte, filename, contentType string) (string, error) {
-	resp, err := b.anthropicClient.Beta.Files.Upload(ctx, anthropic.BetaFileUploadParams{
-		File:  anthropic.File(bytes.NewReader(data), filename, contentType),
-		Betas: []anthropic.AnthropicBeta{anthropic.AnthropicBetaFilesAPI2025_04_14},
-	})
-	if err != nil {
-		return "", fmt.Errorf("anthropic files upload: %w", err)
-	}
-	return resp.ID, nil
-}
-
-func (b *Bot) deleteFileFromAnthropic(ctx context.Context, fileID string) error {
-	_, err := b.anthropicClient.Beta.Files.Delete(ctx, fileID, anthropic.BetaFileDeleteParams{
-		Betas: []anthropic.AnthropicBeta{anthropic.AnthropicBetaFilesAPI2025_04_14},
-	})
-	if err == nil {
-		return nil
-	}
-	var apiErr *anthropic.Error
-	if errors.As(err, &apiErr) && apiErr.StatusCode == http.StatusNotFound {
-		return nil
-	}
-	return fmt.Errorf("anthropic files delete %s: %w", fileID, err)
-}
-
-func (b *Bot) compensatingDelete(ctx context.Context, fileIDs []string) {
-	for _, fid := range fileIDs {
-		if err := b.deleteFileFromAnthropic(ctx, fid); err != nil {
-			ErrorLogger.Printf("[%s] compensating delete for %s: %v", b.config.ID, fid, err)
-		}
-	}
-}
-
-func extractMissingFileID(err error) string {
-	if err == nil {
-		return ""
-	}
-	var apiErr *anthropic.Error
-	if !errors.As(err, &apiErr) {
-		return ""
-	}
-	if apiErr.StatusCode != http.StatusNotFound {
-		return ""
-	}
-	return parseMissingFileIDFromBody(apiErr.RawJSON())
-}
-
-func parseMissingFileIDFromBody(raw string) string {
-	idx := strings.Index(raw, fileNotFoundPrefix)
-	if idx == -1 {
-		return ""
-	}
-	rest := raw[idx+len(fileNotFoundPrefix):]
-	end := strings.IndexFunc(rest, func(r rune) bool {
-		return (r < 'a' || r > 'z') &&
-			(r < 'A' || r > 'Z') &&
-			(r < '0' || r > '9') &&
-			r != '_'
-	})
-	if end == -1 {
-		return rest
-	}
-	return rest[:end]
-}
-
-func (b *Bot) hardDeleteScope(ctx context.Context, query string, args ...interface{}) error {
-	var rows []Message
-	if err := b.db.Unscoped().Where(query, args...).Find(&rows).Error; err != nil {
-		return fmt.Errorf("scan rows: %w", err)
-	}
-	if len(rows) == 0 {
-		return nil
-	}
-	if err := b.db.Where(query, args...).Delete(&Message{}).Error; err != nil {
-		return fmt.Errorf("soft delete: %w", err)
-	}
-
-	hardDeletable := make([]uint, 0, len(rows))
-	for _, row := range rows {
-		if b.deleteRowFiles(ctx, row) {
-			hardDeletable = append(hardDeletable, row.ID)
-		}
-	}
-	if len(hardDeletable) == 0 {
-		return nil
-	}
-	if err := b.db.Unscoped().Where("id IN ?", hardDeletable).Delete(&Message{}).Error; err != nil {
-		return fmt.Errorf("hard delete: %w", err)
-	}
-	return nil
-}
-
-func (b *Bot) deleteRowFiles(ctx context.Context, row Message) bool {
-	if len(row.ImageFileIDs) == 0 {
-		return true
-	}
-	allOk := true
-	for _, fid := range row.ImageFileIDs {
-		if err := b.deleteFileFromAnthropic(ctx, fid); err != nil {
-			ErrorLogger.Printf("[%s] anthropic delete %s (row %d): %v", b.config.ID, fid, row.ID, err)
-			allOk = false
-		}
-	}
-	return allOk
-}
-
-func stripDeadFileIDs(src []string, deadSet map[string]struct{}) (survivors []string, dirty bool) {
-	survivors = make([]string, 0, len(src))
-	for _, fid := range src {
-		if _, dead := deadSet[fid]; dead {
-			dirty = true
-			continue
-		}
-		survivors = append(survivors, fid)
-	}
-	return survivors, dirty
-}
-
-func (b *Bot) markFilesPendingCleanup(ctx context.Context, chatID int64, deadFileIDs []string) (int, error) {
-	if len(deadFileIDs) == 0 {
-		return 0, nil
-	}
-	deadSet := make(map[string]struct{}, len(deadFileIDs))
-	for _, id := range deadFileIDs {
-		deadSet[id] = struct{}{}
-	}
-	var rows []Message
-	if err := b.db.WithContext(ctx).
-		Where("bot_id = ? AND chat_id = ? AND image_file_ids IS NOT NULL", b.botID, chatID).
-		Find(&rows).Error; err != nil {
-		return 0, fmt.Errorf("scan rows for cleanup: %w", err)
-	}
-	now := time.Now()
-	updated := 0
-	for _, row := range rows {
-		survivors, dirty := stripDeadFileIDs(row.ImageFileIDs, deadSet)
-		if !dirty {
-			continue
-		}
-		if len(survivors) == 0 {
-			row.ImageFileIDs = nil
-			row.FilesCleanedAt = &now
-		} else {
-			row.ImageFileIDs = survivors
-		}
-		if err := b.db.WithContext(ctx).Save(&row).Error; err != nil {
-			return updated, fmt.Errorf("update row %d: %w", row.ID, err)
-		}
-		updated++
-	}
-	return updated, nil
-}

anthropic_files_test.go

@@ -1,191 +0,0 @@
-package main
-
-import (
-	"testing"
-	"time"
-
-	"github.com/stretchr/testify/assert"
-)
-
-func TestFormatUploadFilename(t *testing.T) {
-	cases := []struct {
-		botID       uint
-		chatID      int64
-		tgMessageID int
-		ext         string
-		want        string
-	}{
-		{1, 12345, 42, "jpg", "tg-1-12345-42.jpg"},
-		{7, -1001234567890, 1, "png", "tg-7--1001234567890-1.png"},
-		{0, 0, 0, "webp", "tg-0-0-0.webp"},
-	}
-	for _, tc := range cases {
-		got := formatUploadFilename(tc.botID, tc.chatID, tc.tgMessageID, tc.ext)
-		assert.Equal(t, tc.want, got)
-	}
-}
-
-func TestParseMissingFileIDFromBody(t *testing.T) {
-	cases := []struct {
-		name string
-		body string
-		want string
-	}{
-		{
-			name: "canonical Anthropic file-not-found body",
-			body: `{"type":"error","error":{"type":"invalid_request_error","message":"File not found: file_011CNha8iCJcU1wXNR6q4V8w"}}`,
-			want: "file_011CNha8iCJcU1wXNR6q4V8w",
-		},
-		{
-			name: "trailing punctuation after the id is excluded",
-			body: `something File not found: file_abc123! more text`,
-			want: "file_abc123",
-		},
-		{
-			name: "body without the prefix yields empty",
-			body: `{"type":"error","error":{"message":"Model not found: claude-foo"}}`,
-			want: "",
-		},
-		{
-			name: "id at the very end of the buffer",
-			body: `File not found: file_xyz789`,
-			want: "file_xyz789",
-		},
-		{
-			name: "empty body",
-			body: "",
-			want: "",
-		},
-	}
-	for _, tc := range cases {
-		t.Run(tc.name, func(t *testing.T) {
-			assert.Equal(t, tc.want, parseMissingFileIDFromBody(tc.body))
-		})
-	}
-}
-
-func TestStripDeadFileIDs(t *testing.T) {
-	dead := map[string]struct{}{
-		"file_a": {},
-		"file_b": {},
-	}
-	cases := []struct {
-		name          string
-		input         []string
-		wantSurvivors []string
-		wantDirty     bool
-	}{
-		{
-			name:          "no overlap returns input verbatim",
-			input:         []string{"file_x", "file_y"},
-			wantSurvivors: []string{"file_x", "file_y"},
-			wantDirty:     false,
-		},
-		{
-			name:          "partial overlap returns survivors and reports dirty",
-			input:         []string{"file_a", "file_x", "file_b", "file_y"},
-			wantSurvivors: []string{"file_x", "file_y"},
-			wantDirty:     true,
-		},
-		{
-			name:          "all dead returns empty survivors and dirty",
-			input:         []string{"file_a", "file_b"},
-			wantSurvivors: []string{},
-			wantDirty:     true,
-		},
-		{
-			name:          "empty input is not dirty",
-			input:         []string{},
-			wantSurvivors: []string{},
-			wantDirty:     false,
-		},
-	}
-	for _, tc := range cases {
-		t.Run(tc.name, func(t *testing.T) {
-			survivors, dirty := stripDeadFileIDs(tc.input, dead)
-			assert.Equal(t, tc.wantSurvivors, survivors)
-			assert.Equal(t, tc.wantDirty, dirty)
-		})
-	}
-}
-
-func TestMarkFilesPendingCleanup(t *testing.T) {
-	b, _ := setupBotForTest(t, 123)
-	chatID := int64(555)
-
-	row1 := Message{
-		BotID:        b.botID,
-		ChatID:       chatID,
-		UserID:       777,
-		Username:     "u",
-		UserRole:     "user",
-		Text:         "look at these",
-		Timestamp:    time.Now(),
-		IsUser:       true,
-		ImageFileIDs: []string{"file_a", "file_x"},
-	}
-	assert.NoError(t, b.db.Create(&row1).Error)
-
-	row2 := Message{
-		BotID:        b.botID,
-		ChatID:       chatID,
-		UserID:       777,
-		Username:     "u",
-		UserRole:     "user",
-		Text:         "screenshot",
-		Timestamp:    time.Now(),
-		IsUser:       true,
-		ImageFileIDs: []string{"file_a", "file_b"},
-	}
-	assert.NoError(t, b.db.Create(&row2).Error)
-
-	row3 := Message{
-		BotID:        b.botID,
-		ChatID:       chatID,
-		UserID:       777,
-		Username:     "u",
-		UserRole:     "user",
-		Text:         "another",
-		Timestamp:    time.Now(),
-		IsUser:       true,
-		ImageFileIDs: []string{"file_x", "file_y"},
-	}
-	assert.NoError(t, b.db.Create(&row3).Error)
-
-	row4 := Message{
-		BotID:        b.botID,
-		ChatID:       999,
-		UserID:       777,
-		Username:     "u",
-		UserRole:     "user",
-		Text:         "other chat",
-		Timestamp:    time.Now(),
-		IsUser:       true,
-		ImageFileIDs: []string{"file_a"},
-	}
-	assert.NoError(t, b.db.Create(&row4).Error)
-
-	updated, err := b.markFilesPendingCleanup(t.Context(), chatID, []string{"file_a", "file_b"})
-	assert.NoError(t, err)
-	assert.Equal(t, 2, updated, "rows 1 and 2 should have been updated")
-
-	var r1 Message
-	assert.NoError(t, b.db.First(&r1, row1.ID).Error)
-	assert.Equal(t, []string{"file_x"}, r1.ImageFileIDs)
-	assert.Nil(t, r1.FilesCleanedAt)
-
-	var r2 Message
-	assert.NoError(t, b.db.First(&r2, row2.ID).Error)
-	assert.Empty(t, r2.ImageFileIDs)
-	assert.NotNil(t, r2.FilesCleanedAt)
-
-	var r3 Message
-	assert.NoError(t, b.db.First(&r3, row3.ID).Error)
-	assert.Equal(t, []string{"file_x", "file_y"}, r3.ImageFileIDs)
-	assert.Nil(t, r3.FilesCleanedAt)
-
-	var r4 Message
-	assert.NoError(t, b.db.First(&r4, row4.ID).Error)
-	assert.Equal(t, []string{"file_a"}, r4.ImageFileIDs)
-	assert.Nil(t, r4.FilesCleanedAt)
-}

anthropic_test.go

@@ -1,143 +1,197 @@
 package main
 
 import (
-	"encoding/json"
+	"fmt"
 	"strings"
 	"testing"
 	"time"
-
-	"github.com/anthropics/anthropic-sdk-go"
 )
 
-func TestTimeContextFor(t *testing.T) {
-	cases := []struct {
+// TestLanguageCodeReplacement tests that language code is properly handled and replaced
+func TestLanguageCodeReplacement(t *testing.T) {
+	// Test with provided language code
+	systemMessage := "User's language preference: '{language}'"
+
+	// Test with a specific language code
+	langValue := "fr"
+	result := strings.ReplaceAll(systemMessage, "{language}", langValue)
+
+	if !strings.Contains(result, "User's language preference: 'fr'") {
+		t.Errorf("Expected language code 'fr' to be replaced, got: %s", result)
+	}
+
+	// Test with empty language code (should default to "en")
+	langValue = ""
+	if langValue == "" {
+		langValue = "en" // Default to English when language code is not available
+	}
+	result = strings.ReplaceAll(systemMessage, "{language}", langValue)
+
+	if !strings.Contains(result, "User's language preference: 'en'") {
+		t.Errorf("Expected default language code 'en' to be used, got: %s", result)
+	}
+}
+
+// TestPremiumStatusReplacement tests that premium status is properly handled and replaced
+func TestPremiumStatusReplacement(t *testing.T) {
+	systemMessage := "User is a {premium_status}"
+
+	// Test with premium user
+	isPremium := true
+	premiumStatus := "regular user"
+	if isPremium {
+		premiumStatus = "premium user"
+	}
+	result := strings.ReplaceAll(systemMessage, "{premium_status}", premiumStatus)
+
+	if !strings.Contains(result, "User is a premium user") {
+		t.Errorf("Expected premium status to be replaced with 'premium user', got: %s", result)
+	}
+
+	// Test with regular user
+	isPremium = false
+	premiumStatus = "regular user"
+	if isPremium {
+		premiumStatus = "premium user"
+	}
+	result = strings.ReplaceAll(systemMessage, "{premium_status}", premiumStatus)
+
+	if !strings.Contains(result, "User is a regular user") {
+		t.Errorf("Expected premium status to be replaced with 'regular user', got: %s", result)
+	}
+}
+
+// TestTimeContextCalculation tests that time context is correctly calculated for different hours
+func TestTimeContextCalculation(t *testing.T) {
+	// Test cases for different hours
+	testCases := []struct {
 		hour     int
 		expected string
 	}{
-		{3, "night"},
-		{5, "morning"},
-		{11, "morning"},
-		{12, "afternoon"},
-		{17, "afternoon"},
-		{18, "evening"},
-		{21, "evening"},
-		{22, "night"},
-		{23, "night"},
-	}
-	for _, tc := range cases {
-		ts := int(time.Date(2025, 5, 15, tc.hour, 0, 0, 0, time.Local).Unix())
-		if got := timeContextFor(ts); got != tc.expected {
-			t.Errorf("timeContextFor(hour=%d) = %q, want %q", tc.hour, got, tc.expected)
-		}
-	}
-}
-
-func TestBuildUserContext(t *testing.T) {
-	noon := int(time.Date(2025, 5, 15, 12, 0, 0, 0, time.Local).Unix())
-
-	got := buildUserContext("alice", "Alice", "Smith", true, "de", noon)
-	for _, want := range []string{"Alice Smith", "@alice", "Preferred language: de", "premium user", "afternoon"} {
-		if !strings.Contains(got, want) {
-			t.Errorf("buildUserContext premium: missing %q in:\n%s", want, got)
-		}
+		{3, "night"},      // Night: hours < 5 or hours >= 22
+		{5, "morning"},    // Morning: 5 <= hours < 12
+		{12, "afternoon"}, // Afternoon: 12 <= hours < 18
+		{17, "afternoon"}, // Afternoon: 12 <= hours < 18
+		{18, "evening"},   // Evening: 18 <= hours < 22
+		{21, "evening"},   // Evening: 18 <= hours < 22
+		{22, "night"},     // Night: hours < 5 or hours >= 22
+		{23, "night"},     // Night: hours < 5 or hours >= 22
 	}
 
-	got = buildUserContext("", "", "", false, "", noon)
-	for _, want := range []string{"User: unknown (Telegram @unknown)", "Preferred language: en", "regular user"} {
-		if !strings.Contains(got, want) {
-			t.Errorf("buildUserContext fallback: missing %q in:\n%s", want, got)
-		}
-	}
+	for _, tc := range testCases {
+		t.Run(fmt.Sprintf("Hour_%d", tc.hour), func(t *testing.T) {
+			// Create a timestamp for the specified hour
+			testTime := time.Date(2025, 5, 15, tc.hour, 0, 0, 0, time.UTC)
 
-	got = buildUserContext("bob", "Bob", "", false, "en", noon)
-	if !strings.Contains(got, "User: Bob (Telegram @bob)") {
-		t.Errorf("buildUserContext firstname-only: got:\n%s", got)
-	}
-}
+			// Get the hour directly from the test time to ensure it's what we expect
+			actualHour := testTime.Hour()
+			if actualHour != tc.hour {
+				t.Fatalf("Test setup error: expected hour %d, got %d", tc.hour, actualHour)
+			}
 
-func TestThinkingParamFromConfig(t *testing.T) {
-	cases := []struct {
-		name    string
-		mode    string
-		display string
-		ok      bool
-		want    map[string]any
-	}{
-		{"unset omits param", "", "", false, nil},
-		{"unknown value omits param", "bogus", "", false, nil},
-		{"adaptive no display", ThinkingModeAdaptive, "", true,
-			map[string]any{"type": "adaptive"}},
-		{"adaptive summarized", ThinkingModeAdaptive, ThinkingDisplaySummarized, true,
-			map[string]any{"type": "adaptive", "display": "summarized"}},
-		{"adaptive omitted", ThinkingModeAdaptive, ThinkingDisplayOmitted, true,
-			map[string]any{"type": "adaptive", "display": "omitted"}},
-		{"disabled", ThinkingModeDisabled, "", true,
-			map[string]any{"type": "disabled"}},
-	}
-	for _, tc := range cases {
-		t.Run(tc.name, func(t *testing.T) {
-			union, ok := thinkingParamFromConfig(tc.mode, tc.display)
-			if ok != tc.ok {
-				t.Fatalf("ok = %v, want %v", ok, tc.ok)
+			// Calculate time context using the same logic as in anthropic.go
+			var timeContext string
+			if actualHour >= 5 && actualHour < 12 {
+				timeContext = "morning"
+			} else if actualHour >= 12 && actualHour < 18 {
+				timeContext = "afternoon"
+			} else if actualHour >= 18 && actualHour < 22 {
+				timeContext = "evening"
+			} else {
+				timeContext = "night"
 			}
-			if !tc.ok {
-				return
-			}
-			raw, err := json.Marshal(union)
-			if err != nil {
-				t.Fatalf("marshal: %v", err)
-			}
-			var got map[string]any
-			if err := json.Unmarshal(raw, &got); err != nil {
-				t.Fatalf("unmarshal %s: %v", raw, err)
-			}
-			if len(got) != len(tc.want) {
-				t.Fatalf("wire shape %s: got %d keys, want %d (%v)", raw, len(got), len(tc.want), tc.want)
-			}
-			for k, v := range tc.want {
-				if got[k] != v {
-					t.Errorf("wire shape %s: key %q = %v, want %v", raw, k, got[k], v)
-				}
+
+			// Check if the calculated time context matches the expected value
+			if timeContext != tc.expected {
+				t.Errorf("For hour %d: expected time context '%s', got '%s'",
+					actualHour, tc.expected, timeContext)
 			}
 		})
 	}
 }
 
-func TestBackwardCompatibleParams(t *testing.T) {
-	params := anthropic.BetaMessageNewParams{
-		Model:     "claude-test",
-		MaxTokens: defaultMaxTokens,
-		Messages: []anthropic.BetaMessageParam{
-			anthropic.NewBetaUserMessage(anthropic.NewBetaTextBlock("hi")),
-		},
-	}
-	raw, err := json.Marshal(params)
-	if err != nil {
-		t.Fatalf("marshal: %v", err)
-	}
-	var got map[string]any
-	if err := json.Unmarshal(raw, &got); err != nil {
-		t.Fatalf("unmarshal: %v", err)
-	}
-	if _, present := got["thinking"]; present {
-		t.Errorf("zero Thinking union must omit the key; body: %s", raw)
-	}
-	if mt, ok := got["max_tokens"].(float64); !ok || int(mt) != defaultMaxTokens {
-		t.Errorf("max_tokens = %v, want %d; body: %s", got["max_tokens"], defaultMaxTokens, raw)
-	}
-}
+// TestSystemMessagePlaceholderReplacement tests that all placeholders are correctly replaced
+func TestSystemMessagePlaceholderReplacement(t *testing.T) {
+	systemMessage := "The user you're talking to has username '{username}' and display name '{firstname} {lastname}'.\n" +
+		"User's language preference: '{language}'\n" +
+		"User is a {premium_status}\n" +
+		"It's currently {time_context} in your timezone"
 
-func TestEmptyStreamError(t *testing.T) {
-	err := emptyStreamError("max_tokens", 3900, 4000)
-	for _, want := range []string{"output budget exhausted", "3900", "4000"} {
-		if !strings.Contains(err.Error(), want) {
-			t.Errorf("max_tokens case: %q missing %q", err.Error(), want)
-		}
+	// Set up test data
+	username := "testuser"
+	firstName := "Test"
+	lastName := "User"
+	isPremium := true
+	languageCode := "de"
+
+	// Create a timestamp for a specific hour (e.g., 14:00 = afternoon)
+	testTime := time.Date(2025, 5, 15, 14, 0, 0, 0, time.UTC)
+	messageTime := int(testTime.Unix())
+
+	// Handle username placeholder
+	usernameValue := username
+	if username == "" {
+		usernameValue = "unknown"
 	}
-	if got := emptyStreamError("end_turn", 0, 1000).Error(); got != "unexpected response format from Anthropic" {
-		t.Errorf("generic case = %q", got)
+	systemMessage = strings.ReplaceAll(systemMessage, "{username}", usernameValue)
+
+	// Handle firstname placeholder
+	firstnameValue := firstName
+	if firstName == "" {
+		firstnameValue = "unknown"
 	}
-	if got := emptyStreamError("", 0, 1000).Error(); got != "unexpected response format from Anthropic" {
-		t.Errorf("no-stop-reason case = %q", got)
+	systemMessage = strings.ReplaceAll(systemMessage, "{firstname}", firstnameValue)
+
+	// Handle lastname placeholder
+	lastnameValue := lastName
+	if lastName == "" {
+		lastnameValue = ""
+	}
+	systemMessage = strings.ReplaceAll(systemMessage, "{lastname}", lastnameValue)
+
+	// Handle language code placeholder
+	langValue := languageCode
+	if languageCode == "" {
+		langValue = "en"
+	}
+	systemMessage = strings.ReplaceAll(systemMessage, "{language}", langValue)
+
+	// Handle premium status
+	premiumStatus := "regular user"
+	if isPremium {
+		premiumStatus = "premium user"
+	}
+	systemMessage = strings.ReplaceAll(systemMessage, "{premium_status}", premiumStatus)
+
+	// Handle time awareness
+	timeObj := time.Unix(int64(messageTime), 0)
+	hour := timeObj.Hour()
+	var timeContext string
+	if hour >= 5 && hour < 12 {
+		timeContext = "morning"
+	} else if hour >= 12 && hour < 18 {
+		timeContext = "afternoon"
+	} else if hour >= 18 && hour < 22 {
+		timeContext = "evening"
+	} else {
+		timeContext = "night"
+	}
+	systemMessage = strings.ReplaceAll(systemMessage, "{time_context}", timeContext)
+
+	// Check that all placeholders were replaced correctly
+	if !strings.Contains(systemMessage, "username 'testuser'") {
+		t.Errorf("Username not replaced correctly, got: %s", systemMessage)
+	}
+	if !strings.Contains(systemMessage, "display name 'Test User'") {
+		t.Errorf("Display name not replaced correctly, got: %s", systemMessage)
+	}
+	if !strings.Contains(systemMessage, "language preference: 'de'") {
+		t.Errorf("Language preference not replaced correctly, got: %s", systemMessage)
+	}
+	if !strings.Contains(systemMessage, "User is a premium user") {
+		t.Errorf("Premium status not replaced correctly, got: %s", systemMessage)
+	}
+	if !strings.Contains(systemMessage, "It's currently afternoon in your timezone") {
+		t.Errorf("Time context not replaced correctly, got: %s", systemMessage)
 	}
 }

bot.go

@@ -8,17 +8,16 @@ import (
 	"sync"
 	"time"
 
-	"github.com/anthropics/anthropic-sdk-go"
-	"github.com/anthropics/anthropic-sdk-go/option"
 	"github.com/go-telegram/bot"
 	"github.com/go-telegram/bot/models"
+	"github.com/liushuangls/go-anthropic/v2"
 	"gorm.io/gorm"
 )
 
 type Bot struct {
 	tgBot           TelegramClient
 	db              *gorm.DB
-	anthropicClient anthropic.Client
+	anthropicClient *anthropic.Client
 	chatMemories    map[int64]*ChatMemory
 	memorySize      int
 	chatMemoriesMu  sync.RWMutex
@@ -26,11 +25,10 @@ type Bot struct {
 	userLimiters    map[int64]*userLimiter
 	userLimitersMu  sync.RWMutex
 	clock           Clock
-	botID           uint
-	albumBuffers    map[string]*pendingAlbum
-	albumBuffersMu  sync.Mutex
+	botID           uint // Reference to BotModel.ID
 }
 
+// Helper function to determine message type
 func messageType(msg *models.Message) string {
 	if msg.Sticker != nil {
 		return "sticker"
@@ -38,11 +36,13 @@ func messageType(msg *models.Message) string {
 	return "text"
 }
 
+// NewBot initializes and returns a new Bot instance.
 func NewBot(db *gorm.DB, config BotConfig, clock Clock, tgClient TelegramClient) (*Bot, error) {
+	// Retrieve or create Bot entry in the database
 	var botEntry BotModel
 	err := db.Where("identifier = ?", config.ID).First(&botEntry).Error
 	if errors.Is(err, gorm.ErrRecordNotFound) {
-		botEntry = BotModel{Identifier: config.ID, Name: config.ID}
+		botEntry = BotModel{Identifier: config.ID, Name: config.ID} // Customize as needed
 		if err := db.Create(&botEntry).Error; err != nil {
 			return nil, err
 		}
@@ -50,9 +50,11 @@ func NewBot(db *gorm.DB, config BotConfig, clock Clock, tgClient TelegramClient)
 		return nil, err
 	}
 
+	// Ensure the owner exists in the Users table
 	var owner User
 	err = db.Where("telegram_id = ? AND bot_id = ?", config.OwnerTelegramID, botEntry.ID).First(&owner).Error
 	if errors.Is(err, gorm.ErrRecordNotFound) {
+		// Assign the "owner" role
 		var ownerRole Role
 		err := db.Where("name = ?", "owner").First(&ownerRole).Error
 		if err != nil {
@@ -62,12 +64,13 @@ func NewBot(db *gorm.DB, config BotConfig, clock Clock, tgClient TelegramClient)
 		owner = User{
 			BotID:      botEntry.ID,
 			TelegramID: config.OwnerTelegramID,
-			Username:   "",
+			Username:   "", // Initialize as empty; will be updated upon interaction
 			RoleID:     ownerRole.ID,
 			IsOwner:    true,
 		}
 
 		if err := db.Create(&owner).Error; err != nil {
+			// If unique constraint is violated, another owner already exists
 			if strings.Contains(err.Error(), "unique index") {
 				return nil, fmt.Errorf("an owner already exists for this bot")
 			}
@@ -77,7 +80,8 @@ func NewBot(db *gorm.DB, config BotConfig, clock Clock, tgClient TelegramClient)
 		return nil, err
 	}
 
-	anthropicClient := anthropic.NewClient(option.WithAPIKey(config.AnthropicAPIKey))
+	// Use the per-bot Anthropic API key
+	anthropicClient := anthropic.NewClient(config.AnthropicAPIKey)
 
 	b := &Bot{
 		db:              db,
@@ -87,9 +91,8 @@ func NewBot(db *gorm.DB, config BotConfig, clock Clock, tgClient TelegramClient)
 		config:          config,
 		userLimiters:    make(map[int64]*userLimiter),
 		clock:           clock,
-		botID:           botEntry.ID,
+		botID:           botEntry.ID, // Ensure BotModel has ID field
 		tgBot:           tgClient,
-		albumBuffers:    make(map[string]*pendingAlbum),
 	}
 
 	if tgClient == nil {
@@ -104,6 +107,7 @@ func NewBot(db *gorm.DB, config BotConfig, clock Clock, tgClient TelegramClient)
 	return b, nil
 }
 
+// Start begins the bot's operation.
 func (b *Bot) Start(ctx context.Context) {
 	b.tgBot.Start(ctx)
 }
@@ -113,6 +117,7 @@ func (b *Bot) getOrCreateUser(userID int64, username string, isOwner bool) (User
 	err := b.db.Preload("Role").Where("telegram_id = ? AND bot_id = ?", userID, b.botID).First(&user).Error
 	if err != nil {
 		if errors.Is(err, gorm.ErrRecordNotFound) {
+			// Check if an owner already exists for this bot
 			if isOwner {
 				var existingOwner User
 				err := b.db.Where("bot_id = ? AND is_owner = ?", b.botID, true).First(&existingOwner).Error
@@ -128,7 +133,7 @@ func (b *Bot) getOrCreateUser(userID int64, username string, isOwner bool) (User
 			if isOwner {
 				roleName = "owner"
 			} else {
-				roleName = "user"
+				roleName = "user" // Assign "user" role to non-owner users
 			}
 
 			err := b.db.Where("name = ?", roleName).First(&role).Error
@@ -146,6 +151,7 @@ func (b *Bot) getOrCreateUser(userID int64, username string, isOwner bool) (User
 			}
 
 			if err := b.db.Create(&user).Error; err != nil {
+				// If unique constraint is violated, another owner already exists
 				if strings.Contains(err.Error(), "unique index") {
 					return User{}, fmt.Errorf("an owner already exists for this bot")
 				}
@@ -189,9 +195,10 @@ func (b *Bot) createMessage(chatID, userID int64, username, userRole, text strin
 	return message
 }
 
+// storeMessage stores a message in the database and updates its ID
 func (b *Bot) storeMessage(message *Message) error {
-	message.BotID = b.botID
-	return b.db.Create(message).Error
+	message.BotID = b.botID           // Associate the message with the correct bot
+	return b.db.Create(message).Error // This will update the message with its new ID
 }
 
 func (b *Bot) getOrCreateChatMemory(chatID int64) *ChatMemory {
@@ -205,12 +212,14 @@ func (b *Bot) getOrCreateChatMemory(chatID int64) *ChatMemory {
 
 		chatMemory, exists = b.chatMemories[chatID]
 		if !exists {
+			// Check if this is a new chat by querying the database
 			var count int64
 			b.db.Model(&Message{}).Where("chat_id = ? AND bot_id = ?", chatID, b.botID).Count(&count)
-			isNewChat := count == 0
+			isNewChat := count == 0 // Truly new chat if no messages exist
 
 			var messages []Message
 			if !isNewChat {
+				// Fetch existing messages only if it's not a new chat
 				err := b.db.Where("chat_id = ? AND bot_id = ?", chatID, b.botID).
 					Order("timestamp desc").
 					Limit(b.memorySize * 2).
@@ -218,14 +227,15 @@ func (b *Bot) getOrCreateChatMemory(chatID int64) *ChatMemory {
 
 				if err != nil {
 					ErrorLogger.Printf("Error fetching messages from database: %v", err)
-					messages = []Message{}
+					messages = []Message{} // Initialize an empty slice on error
 				} else {
+					// Reverse from newest-first to chronological order for conversation context.
 					for i, j := 0, len(messages)-1; i < j; i, j = i+1, j-1 {
 						messages[i], messages[j] = messages[j], messages[i]
 					}
 				}
 			} else {
-				messages = []Message{}
+				messages = []Message{} // Ensure messages is initialized for new chats
 			}
 
 			chatMemory = &ChatMemory{
@@ -240,84 +250,65 @@ func (b *Bot) getOrCreateChatMemory(chatID int64) *ChatMemory {
 	return chatMemory
 }
 
-func (b *Bot) stripDeadFileIDFromMemory(chatID int64, deadFileID string) {
-	b.chatMemoriesMu.Lock()
-	defer b.chatMemoriesMu.Unlock()
-	cm, exists := b.chatMemories[chatID]
-	if !exists {
-		return
-	}
-	for i := range cm.Messages {
-		if len(cm.Messages[i].ImageFileIDs) == 0 {
-			continue
-		}
-		survivors := make([]string, 0, len(cm.Messages[i].ImageFileIDs))
-		for _, fid := range cm.Messages[i].ImageFileIDs {
-			if fid != deadFileID {
-				survivors = append(survivors, fid)
-			}
-		}
-		cm.Messages[i].ImageFileIDs = survivors
-	}
-}
-
+// addMessageToChatMemory adds a new message to the chat memory, ensuring the memory size is maintained.
 func (b *Bot) addMessageToChatMemory(chatMemory *ChatMemory, message Message) {
 	b.chatMemoriesMu.Lock()
 	defer b.chatMemoriesMu.Unlock()
 
+	// Add the new message
 	chatMemory.Messages = append(chatMemory.Messages, message)
 
+	// Maintain the memory size
 	if len(chatMemory.Messages) > chatMemory.Size {
 		chatMemory.Messages = chatMemory.Messages[len(chatMemory.Messages)-chatMemory.Size:]
 	}
 }
 
-func (b *Bot) prepareContextMessages(chatMemory *ChatMemory) []anthropic.BetaMessageParam {
+func (b *Bot) prepareContextMessages(chatMemory *ChatMemory) []anthropic.Message {
 	b.chatMemoriesMu.RLock()
 	defer b.chatMemoriesMu.RUnlock()
 
+	// Debug logging
 	InfoLogger.Printf("Chat memory contains %d messages", len(chatMemory.Messages))
 	for i, msg := range chatMemory.Messages {
-		InfoLogger.Printf("Message %d: IsUser=%v, Text=%q Images=%d", i, msg.IsUser, msg.Text, len(msg.ImageFileIDs))
+		InfoLogger.Printf("Message %d: IsUser=%v, Text=%q", i, msg.IsUser, msg.Text)
 	}
 
-	var contextMessages []anthropic.BetaMessageParam
+	// Note: consecutive messages with the same role are permitted.
+	// The Anthropic API automatically merges them into a single turn rather than
+	// returning an error. This can happen after a /clear (which only deletes user
+	// messages, leaving assistant messages in the DB) followed by a restart.
+	// See: https://platform.claude.com/docs/en/api/messages
+	var contextMessages []anthropic.Message
 	for _, msg := range chatMemory.Messages {
-		blocks := contentBlocksForMessage(msg)
-		if len(blocks) == 0 {
+		role := anthropic.RoleUser
+		if !msg.IsUser {
+			role = anthropic.RoleAssistant
+		}
+
+		textContent := strings.TrimSpace(msg.Text)
+		if textContent == "" {
+			// Skip empty messages
 			continue
 		}
-		var param anthropic.BetaMessageParam
-		if msg.IsUser {
-			param = anthropic.NewBetaUserMessage(blocks...)
-		} else {
-			param = anthropic.BetaMessageParam{
-				Role:    anthropic.BetaMessageParamRoleAssistant,
-				Content: blocks,
-			}
-		}
-		contextMessages = append(contextMessages, param)
+
+		contextMessages = append(contextMessages, anthropic.Message{
+			Role: role,
+			Content: []anthropic.MessageContent{
+				anthropic.NewTextMessageContent(textContent),
+			},
+		})
 	}
 	return contextMessages
 }
 
-func contentBlocksForMessage(msg Message) []anthropic.BetaContentBlockParamUnion {
-	var blocks []anthropic.BetaContentBlockParamUnion
-	if msg.IsUser && len(msg.ImageFileIDs) > 0 {
-		multi := len(msg.ImageFileIDs) > 1
-		for i, fileID := range msg.ImageFileIDs {
-			if multi {
-				blocks = append(blocks, anthropic.NewBetaTextBlock(fmt.Sprintf("Image %d:", i+1)))
-			}
-			blocks = append(blocks, anthropic.NewBetaImageBlock(anthropic.BetaFileImageSourceParam{FileID: fileID}))
-		}
-	}
-	if textContent := strings.TrimSpace(msg.Text); textContent != "" {
-		blocks = append(blocks, anthropic.NewBetaTextBlock(textContent))
-	}
-	return blocks
+func (b *Bot) isNewChat(chatID int64) bool {
+	var count int64
+	b.db.Model(&Message{}).Where("chat_id = ? AND bot_id = ?", chatID, b.botID).Count(&count)
+	return count == 0 // Only consider a chat new if it has 0 messages
 }
 
+// roleHasScope reports whether role (with pre-loaded Scopes) contains the given scope name.
 func roleHasScope(role Role, scope string) bool {
 	for _, s := range role.Scopes {
 		if s.Name == scope {
@@ -327,6 +318,8 @@ func roleHasScope(role Role, scope string) bool {
 	return false
 }
 
+// hasScope reports whether the user identified by userID holds the given scope for this bot.
+// Owners implicitly hold all scopes regardless of their assigned role.
 func (b *Bot) hasScope(userID int64, scope string) bool {
 	var user User
 	if err := b.db.Preload("Role.Scopes").
@@ -340,44 +333,52 @@ func (b *Bot) hasScope(userID int64, scope string) bool {
 	return roleHasScope(user.Role, scope)
 }
 
+// publicBotCommands are shown to every user in the Telegram command palette.
 var publicBotCommands = []models.BotCommand{
 	{Command: "stats", Description: "Get bot statistics. Usage: /stats or /stats user [user_id]"},
 	{Command: "whoami", Description: "Get your user information"},
 	{Command: "clear", Description: "Clear chat history (soft delete). Admins: /clear [user_id]"},
 }
 
+// adminBotCommands are shown only in admin/owner chats via BotCommandScopeChatMember.
 var adminBotCommands = []models.BotCommand{
 	{Command: "clear_hard", Description: "Clear chat history (permanently delete). Admins: /clear_hard [user_id]"},
 	{Command: "set_model", Description: "Switch the AI model (admin/owner only). Usage: /set_model <model-id>"},
 }
 
+// registerAdminCommandsForUser scopes the full command palette to a specific user's private chat.
+// In Telegram private chats, chat_id == user_id, so both fields carry the same value.
+// Errors are logged but treated as non-fatal: the user retains access via permission checks.
 func (b *Bot) registerAdminCommandsForUser(ctx context.Context, telegramID int64) {
 	allCommands := make([]models.BotCommand, 0, len(publicBotCommands)+len(adminBotCommands))
 	allCommands = append(allCommands, publicBotCommands...)
 	allCommands = append(allCommands, adminBotCommands...)
 	_, err := b.tgBot.SetMyCommands(ctx, &bot.SetMyCommandsParams{
 		Commands: allCommands,
-		Scope:    &models.BotCommandScopeChat{ChatID: telegramID},
+		Scope:    &models.BotCommandScopeChatMember{ChatID: telegramID, UserID: telegramID},
 	})
 	if err != nil {
 		ErrorLogger.Printf("Failed to register admin commands for user %d: %v", telegramID, err)
 	}
 }
 
+// setElevatedCommands registers the full command palette (public + admin) for every user
+// whose role carries the model:set scope, or who is the bot owner. Called once at startup
+// and uses the freshly created tgBot directly (b.tgBot is not yet assigned at that point).
 func setElevatedCommands(tgBot TelegramClient, users []User) {
 	allCommands := make([]models.BotCommand, 0, len(publicBotCommands)+len(adminBotCommands))
 	allCommands = append(allCommands, publicBotCommands...)
 	allCommands = append(allCommands, adminBotCommands...)
 	for _, u := range users {
 		if u.TelegramID == 0 {
-			continue
+			continue // skip placeholder users not yet seen in a chat
 		}
 		if !u.IsOwner && !roleHasScope(u.Role, ScopeModelSet) {
 			continue
 		}
 		_, err := tgBot.SetMyCommands(context.Background(), &bot.SetMyCommandsParams{
 			Commands: allCommands,
-			Scope:    &models.BotCommandScopeChat{ChatID: u.TelegramID},
+			Scope:    &models.BotCommandScopeChatMember{ChatID: u.TelegramID, UserID: u.TelegramID},
 		})
 		if err != nil {
 			ErrorLogger.Printf("Warning: could not set admin commands for user %d: %v", u.TelegramID, err)
@@ -395,6 +396,7 @@ func initTelegramBot(token string, b *Bot) (TelegramClient, error) {
 		return nil, err
 	}
 
+	// Register public commands for all users.
 	_, err = tgBot.SetMyCommands(context.Background(), &bot.SetMyCommandsParams{
 		Commands: publicBotCommands,
 		Scope:    &models.BotCommandScopeDefault{},
@@ -404,6 +406,10 @@ func initTelegramBot(token string, b *Bot) (TelegramClient, error) {
 		return nil, err
 	}
 
+	// Register full command palette (public + admin) scoped to each known elevated user.
+	// BotCommandScopeChatMember targets the user's private DM with the bot (chat_id == user_id).
+	// Elevation is determined by scope rather than role name, so renaming roles requires no code change.
+	// This is best-effort: failures are logged but do not prevent the bot from starting.
 	var allUsers []User
 	if err := b.db.Preload("Role.Scopes").Where("bot_id = ?", b.botID).Find(&allUsers).Error; err != nil {
 		ErrorLogger.Printf("Warning: could not query users for command scoping: %v", err)
@@ -415,12 +421,14 @@ func initTelegramBot(token string, b *Bot) (TelegramClient, error) {
 }
 
 func (b *Bot) sendResponse(ctx context.Context, chatID int64, text string, businessConnectionID string) error {
+	// Pass the outgoing message through the centralized screen for storage and chat memory update
 	_, err := b.screenOutgoingMessage(chatID, text)
 	if err != nil {
 		ErrorLogger.Printf("Error storing assistant message: %v", err)
 		return err
 	}
 
+	// Prepare message parameters
 	params := &bot.SendMessageParams{
 		ChatID: chatID,
 		Text:   text,
@@ -430,6 +438,7 @@ func (b *Bot) sendResponse(ctx context.Context, chatID int64, text string, busin
 		params.BusinessConnectionID = businessConnectionID
 	}
 
+	// Send the message via Telegram client
 	_, err = b.tgBot.SendMessage(ctx, params)
 	if err != nil {
 		ErrorLogger.Printf("[%s] Error sending message to chat %d with BusinessConnectionID %s: %v",
@@ -439,23 +448,9 @@ func (b *Bot) sendResponse(ctx context.Context, chatID int64, text string, busin
 	return nil
 }
 
-func (b *Bot) sendOneSegment(ctx context.Context, chatID int64, text, businessConnectionID string) error {
-	params := &bot.SendMessageParams{
-		ChatID: chatID,
-		Text:   text,
-	}
-	if businessConnectionID != "" {
-		params.BusinessConnectionID = businessConnectionID
-	}
-	if _, err := b.tgBot.SendMessage(ctx, params); err != nil {
-		ErrorLogger.Printf("[%s] Error sending segment to chat %d with BusinessConnectionID %s: %v",
-			b.config.ID, chatID, businessConnectionID, err)
-		return err
-	}
-	return nil
-}
-
+// sendStats sends the bot statistics to the specified chat.
 func (b *Bot) sendStats(ctx context.Context, chatID int64, userID int64, targetUserID int64, businessConnectionID string) {
+	// If targetUserID is 0, show global stats
 	if targetUserID == 0 {
 		totalUsers, totalMessages, err := b.getStats()
 		if err != nil {
@@ -466,6 +461,7 @@ func (b *Bot) sendStats(ctx context.Context, chatID int64, userID int64, targetU
 			return
 		}
 
+		// Do NOT manually escape hyphens here
 		statsMessage := fmt.Sprintf(
 			"📊 Bot Statistics:\n\n"+
 				"- Total Users: %d\n"+
@@ -474,42 +470,15 @@ func (b *Bot) sendStats(ctx context.Context, chatID int64, userID int64, targetU
 			totalMessages,
 		)
 
-		if b.hasScope(userID, ScopeStatsViewAny) {
-			type topEntry struct {
-				UserID   int64
-				MsgCount int64
-			}
-			var top []topEntry
-			if err := b.db.Model(&Message{}).
-				Select("user_id, COUNT(*) as msg_count").
-				Where("bot_id = ? AND is_user = ? AND deleted_at IS NULL", b.botID, true).
-				Group("user_id").
-				Order("msg_count DESC").
-				Limit(3).
-				Scan(&top).Error; err != nil {
-				ErrorLogger.Printf("Error fetching top users: %v", err)
-			} else if len(top) > 0 {
-				statsMessage += "\n\n🏆 Most Active Users:"
-				for i, entry := range top {
-					var u User
-					if err := b.db.Select("username").Where("telegram_id = ? AND bot_id = ?", entry.UserID, b.botID).First(&u).Error; err != nil {
-						u.Username = fmt.Sprintf("ID:%d", entry.UserID)
-					}
-					name := u.Username
-					if name == "" {
-						name = fmt.Sprintf("ID:%d", entry.UserID)
-					}
-					statsMessage += fmt.Sprintf("\n%d. @%s — %d messages", i+1, name, entry.MsgCount)
-				}
-			}
-		}
-
+		// Send the response through the centralized screen
 		if err := b.sendResponse(ctx, chatID, statsMessage, businessConnectionID); err != nil {
 			ErrorLogger.Printf("Error sending stats message: %v", err)
 		}
 		return
 	}
 
+	// If targetUserID is not 0, show user-specific stats
+	// Check permissions if the user is trying to view someone else's stats
 	if targetUserID != userID {
 		if !b.hasScope(userID, ScopeStatsViewAny) {
 			InfoLogger.Printf("User %d attempted to view stats for user %d without permission", userID, targetUserID)
@@ -520,6 +489,7 @@ func (b *Bot) sendStats(ctx context.Context, chatID int64, userID int64, targetU
 		}
 	}
 
+	// Get user stats
 	username, messagesIn, messagesOut, totalMessages, err := b.getUserStats(targetUserID)
 	if err != nil {
 		ErrorLogger.Printf("Error fetching user stats: %v\n", err)
@@ -529,6 +499,7 @@ func (b *Bot) sendStats(ctx context.Context, chatID int64, userID int64, targetU
 		return
 	}
 
+	// Build the user stats message
 	userInfo := fmt.Sprintf("@%s (ID: %d)", username, targetUserID)
 	if username == "" {
 		userInfo = fmt.Sprintf("User ID: %d", targetUserID)
@@ -550,6 +521,7 @@ func (b *Bot) sendStats(ctx context.Context, chatID int64, userID int64, targetU
 	}
 }
 
+// getStats retrieves the total number of users and messages from the database.
 func (b *Bot) getStats() (int64, int64, error) {
 	var totalUsers int64
 	if err := b.db.Model(&User{}).Where("bot_id = ?", b.botID).Count(&totalUsers).Error; err != nil {
@@ -564,30 +536,36 @@ func (b *Bot) getStats() (int64, int64, error) {
 	return totalUsers, totalMessages, nil
 }
 
+// getUserStats retrieves statistics for a specific user
 func (b *Bot) getUserStats(userID int64) (string, int64, int64, int64, error) {
+	// Get user information from database
 	var user User
 	err := b.db.Where("telegram_id = ? AND bot_id = ?", userID, b.botID).First(&user).Error
 	if err != nil {
 		return "", 0, 0, 0, fmt.Errorf("user not found: %w", err)
 	}
 
+	// Count messages sent by the user (IN)
 	var messagesIn int64
 	if err := b.db.Model(&Message{}).Where("user_id = ? AND bot_id = ? AND is_user = ?",
 		userID, b.botID, true).Count(&messagesIn).Error; err != nil {
 		return "", 0, 0, 0, err
 	}
 
+	// Count responses to the user (OUT)
 	var messagesOut int64
 	if err := b.db.Model(&Message{}).Where("chat_id IN (SELECT DISTINCT chat_id FROM messages WHERE user_id = ? AND bot_id = ? AND deleted_at IS NULL) AND bot_id = ? AND is_user = ?",
 		userID, b.botID, b.botID, false).Count(&messagesOut).Error; err != nil {
 		return "", 0, 0, 0, err
 	}
 
+	// Total messages is the sum
 	totalMessages := messagesIn + messagesOut
 
 	return user.Username, messagesIn, messagesOut, totalMessages, nil
 }
 
+// isOnlyEmojis checks if the string consists solely of emojis.
 func isOnlyEmojis(s string) bool {
 	for _, r := range s {
 		if !isEmoji(r) {
@@ -597,12 +575,14 @@ func isOnlyEmojis(s string) bool {
 	return true
 }
 
+// isEmoji determines if a rune is an emoji.
+// This is a simplistic check and can be expanded based on requirements.
 func isEmoji(r rune) bool {
-	return (r >= 0x1F600 && r <= 0x1F64F) ||
-		(r >= 0x1F300 && r <= 0x1F5FF) ||
-		(r >= 0x1F680 && r <= 0x1F6FF) ||
-		(r >= 0x2600 && r <= 0x26FF) ||
-		(r >= 0x2700 && r <= 0x27BF)
+	return (r >= 0x1F600 && r <= 0x1F64F) || // Emoticons
+		(r >= 0x1F300 && r <= 0x1F5FF) || // Misc Symbols and Pictographs
+		(r >= 0x1F680 && r <= 0x1F6FF) || // Transport and Map
+		(r >= 0x2600 && r <= 0x26FF) || // Misc symbols
+		(r >= 0x2700 && r <= 0x27BF) // Dingbats
 }
 
 func (b *Bot) sendWhoAmI(ctx context.Context, chatID int64, userID int64, username string, businessConnectionID string) {
@@ -632,11 +612,13 @@ func (b *Bot) sendWhoAmI(ctx context.Context, chatID int64, userID int64, userna
 		role.Name,
 	)
 
+	// Send the response through the centralized screen
 	if err := b.sendResponse(ctx, chatID, whoAmIMessage, businessConnectionID); err != nil {
 		ErrorLogger.Printf("Error sending /whoami message: %v", err)
 	}
 }
 
+// screenIncomingMessage centralizes all incoming message processing: storing messages and updating chat memory.
 func (b *Bot) screenIncomingMessage(message *models.Message) (Message, error) {
 	if b.config.DebugScreening {
 		start := time.Now()
@@ -652,8 +634,9 @@ func (b *Bot) screenIncomingMessage(message *models.Message) (Message, error) {
 		}()
 	}
 
-	userRole := "user"
+	userRole := string(anthropic.RoleUser)
 
+	// Determine message text based on message type
 	messageText := message.Text
 	if message.Sticker != nil {
 		if message.Sticker.Emoji != "" {
@@ -662,31 +645,34 @@ func (b *Bot) screenIncomingMessage(message *models.Message) (Message, error) {
 			messageText = "Sent a sticker."
 		}
 	}
-	if message.Voice != nil {
-		messageText = "[Voice message]"
-	}
 
 	userMessage := b.createMessage(message.Chat.ID, message.From.ID, message.From.Username, userRole, messageText, true)
 
+	// Handle sticker-specific details if present
 	if message.Sticker != nil {
 		userMessage.StickerFileID = message.Sticker.FileID
-		userMessage.StickerEmoji = message.Sticker.Emoji
+		userMessage.StickerEmoji = message.Sticker.Emoji // Store the sticker emoji
 		if message.Sticker.Thumbnail != nil {
 			userMessage.StickerPNGFile = message.Sticker.Thumbnail.FileID
 		}
 	}
 
+	// Get the chat memory before storing the message
 	chatMemory := b.getOrCreateChatMemory(message.Chat.ID)
 
+	// Store the message and get its ID
 	if err := b.storeMessage(&userMessage); err != nil {
 		return Message{}, err
 	}
 
+	// Add the message to the chat memory
 	b.addMessageToChatMemory(chatMemory, userMessage)
 
 	return userMessage, nil
 }
 
+// screenOutgoingMessage handles storing of outgoing messages and updating chat memory.
+// It also marks the most recent unanswered user message as answered.
 func (b *Bot) screenOutgoingMessage(chatID int64, response string) (Message, error) {
 	if b.config.DebugScreening {
 		start := time.Now()
@@ -701,11 +687,13 @@ func (b *Bot) screenOutgoingMessage(chatID int64, response string) (Message, err
 		}()
 	}
 
-	assistantMessage := b.createMessage(chatID, 0, "", "assistant", response, false)
+	// Create and store the assistant message
+	assistantMessage := b.createMessage(chatID, 0, "", string(anthropic.RoleAssistant), response, false)
 	if err := b.storeMessage(&assistantMessage); err != nil {
 		return Message{}, err
 	}
 
+	// Find and mark the most recent unanswered user message as answered
 	now := time.Now()
 	err := b.db.Model(&Message{}).
 		Where("chat_id = ? AND bot_id = ? AND is_user = ? AND answered_on IS NULL",
@@ -716,8 +704,10 @@ func (b *Bot) screenOutgoingMessage(chatID int64, response string) (Message, err
 
 	if err != nil {
 		ErrorLogger.Printf("Error marking user message as answered: %v", err)
+		// Continue even if there's an error updating the user message
 	}
 
+	// Update chat memory with the message that now has an ID
 	chatMemory := b.getOrCreateChatMemory(chatID)
 	b.addMessageToChatMemory(chatMemory, assistantMessage)
 
@@ -725,26 +715,31 @@ func (b *Bot) screenOutgoingMessage(chatID int64, response string) (Message, err
 }
 
 func (b *Bot) promoteUserToAdmin(promoterID, userToPromoteID int64) error {
+	// Check if the promoter has the user:promote scope
 	if !b.hasScope(promoterID, ScopeUserPromote) {
 		return errors.New("only admins or owners can promote users to admin")
 	}
 
+	// Get the user to promote
 	userToPromote, err := b.getOrCreateUser(userToPromoteID, "", false)
 	if err != nil {
 		return err
 	}
 
+	// Get the admin role
 	var adminRole Role
 	if err := b.db.Where("name = ?", "admin").First(&adminRole).Error; err != nil {
 		return err
 	}
 
+	// Update the user's role
 	userToPromote.RoleID = adminRole.ID
 	userToPromote.Role = adminRole
 	if err := b.db.Save(&userToPromote).Error; err != nil {
 		return err
 	}
 
+	// Surface admin commands in the newly promoted user's private chat.
 	b.registerAdminCommandsForUser(context.Background(), userToPromoteID)
 	return nil
 }

bot_test.go

@@ -1,105 +0,0 @@
-package main
-
-import (
-	"testing"
-
-	"github.com/stretchr/testify/assert"
-)
-
-func TestContentBlocksForMessage(t *testing.T) {
-	t.Run("empty message yields no blocks", func(t *testing.T) {
-		blocks := contentBlocksForMessage(Message{IsUser: true})
-		assert.Empty(t, blocks)
-	})
-
-	t.Run("user text only yields one text block", func(t *testing.T) {
-		blocks := contentBlocksForMessage(Message{IsUser: true, Text: "hello"})
-		assert.Len(t, blocks, 1)
-		assert.NotNil(t, blocks[0].OfText)
-		assert.Equal(t, "hello", blocks[0].OfText.Text)
-	})
-
-	t.Run("user single image without caption — no label, no text", func(t *testing.T) {
-		blocks := contentBlocksForMessage(Message{
-			IsUser:       true,
-			ImageFileIDs: []string{"file_solo"},
-		})
-		assert.Len(t, blocks, 1)
-		assert.NotNil(t, blocks[0].OfImage)
-		assert.NotNil(t, blocks[0].OfImage.Source.OfFile)
-		assert.Equal(t, "file_solo", blocks[0].OfImage.Source.OfFile.FileID)
-	})
-
-	t.Run("user single image with caption — image before text", func(t *testing.T) {
-		blocks := contentBlocksForMessage(Message{
-			IsUser:       true,
-			Text:         "is this right?",
-			ImageFileIDs: []string{"file_solo"},
-		})
-		assert.Len(t, blocks, 2)
-		assert.NotNil(t, blocks[0].OfImage, "image block must come before text per Anthropic guidance")
-		assert.Equal(t, "file_solo", blocks[0].OfImage.Source.OfFile.FileID)
-		assert.NotNil(t, blocks[1].OfText)
-		assert.Equal(t, "is this right?", blocks[1].OfText.Text)
-	})
-
-	t.Run("user album (multi-image) labels each with Image N:", func(t *testing.T) {
-		blocks := contentBlocksForMessage(Message{
-			IsUser:       true,
-			Text:         "compare these",
-			ImageFileIDs: []string{"file_a", "file_b", "file_c"},
-		})
-		assert.Len(t, blocks, 7)
-		assert.Equal(t, "Image 1:", blocks[0].OfText.Text)
-		assert.Equal(t, "file_a", blocks[1].OfImage.Source.OfFile.FileID)
-		assert.Equal(t, "Image 2:", blocks[2].OfText.Text)
-		assert.Equal(t, "file_b", blocks[3].OfImage.Source.OfFile.FileID)
-		assert.Equal(t, "Image 3:", blocks[4].OfText.Text)
-		assert.Equal(t, "file_c", blocks[5].OfImage.Source.OfFile.FileID)
-		assert.Equal(t, "compare these", blocks[6].OfText.Text)
-	})
-
-	t.Run("assistant message with images-set is text-only (defensive)", func(t *testing.T) {
-		blocks := contentBlocksForMessage(Message{
-			IsUser:       false,
-			Text:         "I see your screenshot",
-			ImageFileIDs: []string{"file_should_be_ignored"},
-		})
-		assert.Len(t, blocks, 1)
-		assert.NotNil(t, blocks[0].OfText)
-		assert.Equal(t, "I see your screenshot", blocks[0].OfText.Text)
-	})
-
-	t.Run("whitespace-only text is skipped but images survive", func(t *testing.T) {
-		blocks := contentBlocksForMessage(Message{
-			IsUser:       true,
-			Text:         "   \n  ",
-			ImageFileIDs: []string{"file_x"},
-		})
-		assert.Len(t, blocks, 1)
-		assert.NotNil(t, blocks[0].OfImage)
-	})
-}
-
-func TestStripDeadFileIDFromMemory(t *testing.T) {
-	b, _ := setupBotForTest(t, 100)
-	chatID := int64(42)
-
-	cm := b.getOrCreateChatMemory(chatID)
-	cm.Messages = []Message{
-		{IsUser: true, Text: "first", ImageFileIDs: []string{"file_a", "file_b"}},
-		{IsUser: false, Text: "reply"},
-		{IsUser: true, Text: "third", ImageFileIDs: []string{"file_b", "file_c"}},
-	}
-
-	b.stripDeadFileIDFromMemory(chatID, "file_b")
-
-	assert.Equal(t, []string{"file_a"}, cm.Messages[0].ImageFileIDs, "file_b should be removed from message 1")
-	assert.Empty(t, cm.Messages[1].ImageFileIDs, "assistant message untouched")
-	assert.Equal(t, []string{"file_c"}, cm.Messages[2].ImageFileIDs, "file_b should be removed from message 3")
-}
-
-func TestStripDeadFileIDFromMemory_UnknownChatIsNoop(t *testing.T) {
-	b, _ := setupBotForTest(t, 100)
-	b.stripDeadFileIDFromMemory(99999, "file_anything")
-}

clock.go

@@ -1,25 +1,32 @@
+// clock.go
 package main
 
 import "time"
 
+// Clock is an interface to abstract time-related functions.
 type Clock interface {
 	Now() time.Time
 }
 
+// RealClock implements Clock using the actual time.
 type RealClock struct{}
 
+// Now returns the current local time.
 func (RealClock) Now() time.Time {
 	return time.Now()
 }
 
+// MockClock implements Clock for testing purposes.
 type MockClock struct {
 	currentTime time.Time
 }
 
+// Now returns the mocked current time.
 func (mc *MockClock) Now() time.Time {
 	return mc.currentTime
 }
 
+// Advance moves the current time forward by the specified duration.
 func (mc *MockClock) Advance(d time.Duration) {
 	mc.currentTime = mc.currentTime.Add(d)
 }

config.go

@@ -6,50 +6,50 @@ import (
 	"os"
 	"path/filepath"
 	"strings"
-)
 
-type MCPServer struct {
-	Name               string   `json:"name"`
-	URL                string   `json:"url"`
-	AuthorizationToken string   `json:"authorization_token,omitempty"`
-	AllowedTools       []string `json:"allowed_tools,omitempty"`
-}
-
-const (
-	ThinkingModeAdaptive      = "adaptive"
-	ThinkingModeDisabled      = "disabled"
-	ThinkingDisplaySummarized = "summarized"
-	ThinkingDisplayOmitted    = "omitted"
+	"github.com/liushuangls/go-anthropic/v2"
 )
 
 type BotConfig struct {
-	ID                string            `json:"id"`
-	TelegramToken     string            `json:"telegram_token"`
-	MemorySize        int               `json:"memory_size"`
-	MessagePerHour    int               `json:"messages_per_hour"`
-	MessagePerDay     int               `json:"messages_per_day"`
-	TempBanDuration   string            `json:"temp_ban_duration"`
-	Model             string            `json:"model"`
-	Temperature       *float32          `json:"temperature,omitempty"`
-	MaxTokens         int               `json:"max_tokens,omitempty"`
-	Thinking          string            `json:"thinking,omitempty"`
-	ThinkingDisplay   string            `json:"thinking_display,omitempty"`
-	SystemPrompts     map[string]string `json:"system_prompts"`
-	Active            bool              `json:"active"`
-	OwnerTelegramID   int64             `json:"owner_telegram_id"`
-	AnthropicAPIKey   string            `json:"anthropic_api_key"`
-	ElevenLabsAPIKey  string            `json:"elevenlabs_api_key"`
-	ElevenLabsVoiceID string            `json:"elevenlabs_voice_id"`
-	ElevenLabsModel   string            `json:"elevenlabs_model"`
-	DebugScreening    bool              `json:"debug_screening"`
-	MCPServers        []MCPServer       `json:"mcp_servers,omitempty"`
-	ConfigFilePath    string            `json:"-"`
+	ID              string            `json:"id"`
+	TelegramToken   string            `json:"telegram_token"`
+	MemorySize      int               `json:"memory_size"`
+	MessagePerHour  int               `json:"messages_per_hour"`
+	MessagePerDay   int               `json:"messages_per_day"`
+	TempBanDuration string            `json:"temp_ban_duration"`
+	Model           anthropic.Model   `json:"model"`
+	Temperature     *float32          `json:"temperature,omitempty"` // Controls creativity vs determinism (0.0-1.0)
+	SystemPrompts   map[string]string `json:"system_prompts"`
+	Active          bool              `json:"active"`
+	OwnerTelegramID int64             `json:"owner_telegram_id"`
+	AnthropicAPIKey string            `json:"anthropic_api_key"`
+	DebugScreening  bool              `json:"debug_screening"` // Enable detailed screening logs
+	ConfigFilePath  string            `json:"-"`               // Set at load time; not serialized
 }
 
+// Custom unmarshalling to handle anthropic.Model
+func (c *BotConfig) UnmarshalJSON(data []byte) error {
+	type Alias BotConfig
+	aux := &struct {
+		Model string `json:"model"`
+		*Alias
+	}{
+		Alias: (*Alias)(c),
+	}
+	if err := json.Unmarshal(data, &aux); err != nil {
+		return err
+	}
+	c.Model = anthropic.Model(aux.Model)
+	return nil
+}
+
+// validateConfigPath ensures the file path is within the allowed directory
 func validateConfigPath(configDir, filename string) (string, error) {
+	// Clean the paths to remove any . or .. components
 	configDir = filepath.Clean(configDir)
 	filename = filepath.Clean(filename)
 
+	// Get absolute paths
 	absConfigDir, err := filepath.Abs(configDir)
 	if err != nil {
 		return "", fmt.Errorf("failed to get absolute path for config directory: %w", err)
@@ -61,11 +61,13 @@ func validateConfigPath(configDir, filename string) (string, error) {
 		return "", fmt.Errorf("failed to get absolute path for config file: %w", err)
 	}
 
+	// Use filepath.Rel to check if the path is within the config directory
 	rel, err := filepath.Rel(absConfigDir, absPath)
 	if err != nil || strings.HasPrefix(rel, "..") || strings.Contains(rel, "..") {
 		return "", fmt.Errorf("invalid config path: file must be within the config directory")
 	}
 
+	// Verify file extension
 	if filepath.Ext(absPath) != ".json" {
 		return "", fmt.Errorf("invalid file extension: must be .json")
 	}
@@ -107,11 +109,6 @@ func loadAllConfigs(dir string) ([]BotConfig, error) {
 				continue
 			}
 
-			if config.Thinking == ThinkingModeAdaptive && config.MaxTokens > 0 && config.MaxTokens < 4000 {
-				InfoLogger.Printf("[%s] thinking=adaptive with max_tokens=%d: thinking tokens count toward max_tokens; consider >= 4000",
-					config.ID, config.MaxTokens)
-			}
-
 			config.ConfigFilePath = validPath
 			configs = append(configs, config)
 		}
@@ -145,29 +142,6 @@ func validateConfig(config *BotConfig, ids, tokens map[string]bool) error {
 		return fmt.Errorf("missing 'model' field")
 	}
 
-	switch config.Thinking {
-	case "", ThinkingModeAdaptive, ThinkingModeDisabled:
-	default:
-		return fmt.Errorf("invalid 'thinking' value %q: must be %q or %q (or omitted)",
-			config.Thinking, ThinkingModeAdaptive, ThinkingModeDisabled)
-	}
-
-	switch config.ThinkingDisplay {
-	case "":
-	case ThinkingDisplaySummarized, ThinkingDisplayOmitted:
-		if config.Thinking != ThinkingModeAdaptive {
-			return fmt.Errorf("'thinking_display' requires 'thinking': %q (the API rejects display with thinking disabled)",
-				ThinkingModeAdaptive)
-		}
-	default:
-		return fmt.Errorf("invalid 'thinking_display' value %q: must be %q or %q (or omitted)",
-			config.ThinkingDisplay, ThinkingDisplaySummarized, ThinkingDisplayOmitted)
-	}
-
-	if config.MaxTokens < 0 {
-		return fmt.Errorf("'max_tokens' must be greater than 0 when set")
-	}
-
 	if config.MessagePerHour <= 0 {
 		return fmt.Errorf("'messages_per_hour' must be greater than 0")
 	}
@@ -181,6 +155,7 @@ func validateConfig(config *BotConfig, ids, tokens map[string]bool) error {
 
 func loadConfig(filename string) (BotConfig, error) {
 	var config BotConfig
+	// Use filepath.Clean before opening the file
 	file, err := os.OpenFile(filepath.Clean(filename), os.O_RDONLY, 0)
 	if err != nil {
 		return config, fmt.Errorf("failed to open config file %s: %w", filename, err)
@@ -199,12 +174,15 @@ func loadConfig(filename string) (BotConfig, error) {
 	return config, nil
 }
 
+// Reload reloads the BotConfig from the specified filename within the given config directory
 func (c *BotConfig) Reload(configDir, filename string) error {
+	// Validate the config path
 	validPath, err := validateConfigPath(configDir, filename)
 	if err != nil {
 		return fmt.Errorf("invalid config path: %w", err)
 	}
 
+	// Use filepath.Clean before opening the file
 	cleanPath := filepath.Clean(validPath)
 	file, err := os.OpenFile(cleanPath, os.O_RDONLY, 0)
 	if err != nil {
@@ -221,9 +199,12 @@ func (c *BotConfig) Reload(configDir, filename string) error {
 		return fmt.Errorf("failed to decode JSON from %s: %w", validPath, err)
 	}
 
+	c.Model = anthropic.Model(c.Model)
 	return nil
 }
 
+// PersistModel updates the model field in memory and writes it back to the config file on disk.
+// Only the "model" key is changed; all other fields are preserved verbatim.
 func (c *BotConfig) PersistModel(newModel string) error {
 	if c.ConfigFilePath == "" {
 		return fmt.Errorf("config file path not set; cannot persist model")
@@ -250,6 +231,6 @@ func (c *BotConfig) PersistModel(newModel string) error {
 		return fmt.Errorf("failed to write config: %w", err)
 	}
 
-	c.Model = newModel
+	c.Model = anthropic.Model(newModel)
 	return nil
 }

config/default.json

@@ -4,19 +4,18 @@
     "telegram_token": "YOUR_TELEGRAM_BOT_TOKEN",
     "owner_telegram_id": 111111111,
     "anthropic_api_key": "YOUR_SPECIFIC_ANTHROPIC_API_KEY",
-    "elevenlabs_api_key": "",
-    "elevenlabs_voice_id": "",
-    "elevenlabs_model": "",
     "memory_size": 10,
     "messages_per_hour": 20,
     "messages_per_day": 100,
     "temp_ban_duration": "24h",
-    "model": "claude-haiku-4-5",
+    "model": "claude-3-5-haiku-latest",
     "temperature": 0.7,
-    "max_tokens": 1000,
     "debug_screening": false,
     "system_prompts": {
-        "custom_instructions": "You are Atom, a helpful assistant texting through a limited Telegram interface with a 15-word maximum. Write like texting a friend - use shorthand, skip grammar, use slang/abbreviations. The system cuts off anything longer than 15 words.\n\n- Address the user by their first name, and reply in their preferred language (both are in the conversation context).\n- Use time-appropriate greetings based on the user's local time of day.\n- If a user asks about buying apples, inform them that we don't sell apples.\n- When asked for a joke, tell a clean, family-friendly joke about programming or technology.\n- If someone inquires about our services, explain that we offer AI-powered chatbot solutions.\n- For any questions about pricing, direct users to contact our sales team at [email protected].\n- If asked about your capabilities, be honest about what you can and cannot do.\nAlways maintain a friendly and professional tone.",
-        "respond_with_emojis": "The user's message contains only emoji. Reply using only emoji."
+        "default": "You are a helpful assistant.",
+        "custom_instructions": "You are texting through a limited Telegram interface with 15-word maximum. Write like texting a friend - use shorthand, skip grammar, use slang/abbreviations. System cuts off anything longer than 15 words.\n\n- Your name is Atom.\n- The user you're talking to has username '{username}' and display name '{firstname} {lastname}'.\n- User's language preference: '{language}'\n- User is a {premium_status}\n- It's currently {time_context} in your timezone. Use appropriate time-based greetings and address the user by name.\n- If a user asks about buying apples, inform them that we don't sell apples.\n- When asked for a joke, tell a clean, family-friendly joke about programming or technology.\n- If someone inquires about our services, explain that we offer AI-powered chatbot solutions.\n- For any questions about pricing, direct users to contact our sales team at [email protected].\n- If asked about your capabilities, be honest about what you can and cannot do.\nAlways maintain a friendly and professional tone.",
+        "continue_conversation": "Continuing our conversation. Remember previous context if relevant.",
+        "avoid_sensitive": "Avoid discussing sensitive topics or providing harmful information.",
+        "respond_with_emojis": "Since the user sent only emojis, respond using emojis only."
     }
 }

config_test.go

@@ -2,18 +2,21 @@ package main
 
 import (
 	"encoding/json"
-	"fmt"
 	"os"
 	"path/filepath"
 	"strings"
 	"testing"
+
+	"github.com/liushuangls/go-anthropic/v2"
 )
 
+// Set up loggers
 func TestMain(m *testing.M) {
 	initLoggers()
 	os.Exit(m.Run())
 }
 
+// TestBotConfig_UnmarshalJSON tests the custom unmarshalling of BotConfig
 func TestBotConfig_UnmarshalJSON(t *testing.T) { //NOSONAR go:S100 -- underscore separation is idiomatic in Go test names
 	jsonData := `{
 		"id": "bot123",
@@ -35,7 +38,7 @@ func TestBotConfig_UnmarshalJSON(t *testing.T) { //NOSONAR go:S100 -- underscore
 		t.Fatalf("Failed to unmarshal JSON: %v", err)
 	}
 
-	expectedModel := "claude-v1"
+	expectedModel := anthropic.Model("claude-v1")
 	if config.Model != expectedModel {
 		t.Errorf("Expected model %s, got %s", expectedModel, config.Model)
 	}
@@ -45,8 +48,10 @@ func TestBotConfig_UnmarshalJSON(t *testing.T) { //NOSONAR go:S100 -- underscore
 		t.Errorf("Expected ID %s, got %s", expectedID, config.ID)
 	}
 
+	// Add more field checks as necessary
 }
 
+// TestValidateConfigPath tests the validateConfigPath function
 func TestValidateConfigPath(t *testing.T) {
 	execDir, err := os.Getwd()
 	if err != nil {
@@ -91,6 +96,7 @@ func TestValidateConfigPath(t *testing.T) {
 		},
 	}
 
+	// Create a subdirectory for testing
 	subDir := filepath.Join(execDir, "subdir")
 	if err := os.MkdirAll(subDir, 0755); err != nil {
 		t.Fatalf("Failed to create subdir: %v", err)
@@ -116,7 +122,9 @@ func TestValidateConfigPath(t *testing.T) {
 	}
 }
 
+// TestLoadConfig tests the loadConfig function
 func TestLoadConfig(t *testing.T) {
+	// Create a temporary directory
 	tempDir, err := os.MkdirTemp("", "config_test")
 	if err != nil {
 		t.Fatalf("Failed to create temp dir: %v", err)
@@ -127,6 +135,7 @@ func TestLoadConfig(t *testing.T) {
 		}
 	}()
 
+	// Valid config JSON
 	validConfig := `{
 		"id": "bot123",
 		"telegram_token": "token123",
@@ -142,6 +151,7 @@ func TestLoadConfig(t *testing.T) {
 		"anthropic_api_key": "api_key_123"
 	}`
 
+	// Invalid config JSON
 	invalidConfig := `{
 		"id": "bot123",
 		"telegram_token": "token123",
@@ -149,11 +159,13 @@ func TestLoadConfig(t *testing.T) {
 		"model": "claude-v1"
 	}`
 
+	// Write valid config file
 	validPath := filepath.Join(tempDir, "valid_config.json")
 	if err := os.WriteFile(validPath, []byte(validConfig), 0644); err != nil {
 		t.Fatalf("Failed to write valid config: %v", err)
 	}
 
+	// Write invalid config file
 	invalidPath := filepath.Join(tempDir, "invalid_config.json")
 	if err := os.WriteFile(invalidPath, []byte(invalidConfig), 0644); err != nil {
 		t.Fatalf("Failed to write invalid config: %v", err)
@@ -206,6 +218,7 @@ func TestLoadConfig(t *testing.T) {
 	}
 }
 
+// TestValidateConfig tests the validateConfig function
 func TestValidateConfig(t *testing.T) {
 	tests := []struct {
 		name          string
@@ -338,7 +351,9 @@ func TestValidateConfig(t *testing.T) {
 	}
 }
 
+// TestLoadAllConfigs tests the loadAllConfigs function
 func TestLoadAllConfigs(t *testing.T) {
+	// Create a temporary directory
 	tempDir, err := os.MkdirTemp("", "load_all_configs_test")
 	if err != nil {
 		t.Fatalf("Failed to create temp dir: %v", err)
@@ -351,7 +366,7 @@ func TestLoadAllConfigs(t *testing.T) {
 
 	tests := []struct {
 		name           string
-		setupFiles     map[string]string
+		setupFiles     map[string]string // filename -> content
 		expectConfigs  int
 		expectError    bool
 		expectErrorMsg string
@@ -509,6 +524,7 @@ func TestLoadAllConfigs(t *testing.T) {
 
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
+			// Clear the tempDir before each test
 			if err := os.RemoveAll(tempDir); err != nil {
 				t.Fatalf("Failed to remove temp dir: %v", err)
 			}
@@ -516,6 +532,7 @@ func TestLoadAllConfigs(t *testing.T) {
 				t.Fatalf("Failed to create temp dir: %v", err)
 			}
 
+			// Write the test files directly
 			for filename, content := range tt.setupFiles {
 				err := os.WriteFile(filepath.Join(tempDir, filename), []byte(content), 0644)
 				if err != nil {
@@ -535,7 +552,9 @@ func TestLoadAllConfigs(t *testing.T) {
 	}
 }
 
+// TestBotConfig_Reload tests the Reload method of BotConfig
 func TestBotConfig_Reload(t *testing.T) { //NOSONAR go:S100 -- underscore separation is idiomatic in Go test names
+	// Create a temporary directory
 	tempDir, err := os.MkdirTemp("", "reload_test")
 	if err != nil {
 		t.Fatalf("Failed to create temp dir: %v", err)
@@ -546,6 +565,7 @@ func TestBotConfig_Reload(t *testing.T) { //NOSONAR go:S100 -- underscore separa
 		}
 	}()
 
+	// Create initial config file
 	config1 := `{
 		"id": "bot123",
 		"telegram_token": "token123",
@@ -565,11 +585,13 @@ func TestBotConfig_Reload(t *testing.T) { //NOSONAR go:S100 -- underscore separa
 		t.Fatalf("Failed to write initial config: %v", err)
 	}
 
+	// Initialize BotConfig
 	var config BotConfig
 	if err := config.Reload(tempDir, "config.json"); err != nil {
 		t.Fatalf("Failed to reload config: %v", err)
 	}
 
+	// Verify initial load
 	if config.ID != "bot123" {
 		t.Errorf("Expected ID 'bot123', got '%s'", config.ID)
 	}
@@ -577,6 +599,7 @@ func TestBotConfig_Reload(t *testing.T) { //NOSONAR go:S100 -- underscore separa
 		t.Errorf("Expected Model 'claude-v1', got '%s'", config.Model)
 	}
 
+	// Update config file
 	config2 := `{
 		"id": "bot123",
 		"telegram_token": "token123_updated",
@@ -595,10 +618,12 @@ func TestBotConfig_Reload(t *testing.T) { //NOSONAR go:S100 -- underscore separa
 		t.Fatalf("Failed to write updated config: %v", err)
 	}
 
+	// Reload config
 	if err := config.Reload(tempDir, "config.json"); err != nil {
 		t.Fatalf("Failed to reload updated config: %v", err)
 	}
 
+	// Verify updated config
 	if config.TelegramToken != "token123_updated" {
 		t.Errorf("Expected TelegramToken 'token123_updated', got '%s'", config.TelegramToken)
 	}
@@ -613,6 +638,7 @@ func TestBotConfig_Reload(t *testing.T) { //NOSONAR go:S100 -- underscore separa
 	}
 }
 
+// TestBotConfig_UnmarshalJSON_Invalid tests unmarshalling with invalid model
 func TestBotConfig_UnmarshalJSON_Invalid(t *testing.T) { //NOSONAR go:S100 -- underscore separation is idiomatic in Go test names
 	jsonData := `{
 		"id": "bot123",
@@ -640,11 +666,14 @@ func TestBotConfig_UnmarshalJSON_Invalid(t *testing.T) { //NOSONAR go:S100 -- un
 	}
 }
 
+// Helper function to check substring
 func contains(s, substr string) bool {
 	return strings.Contains(s, substr)
 }
 
+// TestTemperatureConfig tests that the temperature value is correctly loaded
 func TestTemperatureConfig(t *testing.T) {
+	// Create a temporary directory
 	tempDir, err := os.MkdirTemp("", "temperature_test")
 	if err != nil {
 		t.Fatalf("Failed to create temp dir: %v", err)
@@ -655,6 +684,7 @@ func TestTemperatureConfig(t *testing.T) {
 		}
 	}()
 
+	// Create config with temperature
 	configWithTemp := `{
 		"id": "bot123",
 		"telegram_token": "token123",
@@ -670,6 +700,7 @@ func TestTemperatureConfig(t *testing.T) {
 		"anthropic_api_key": "api_key_123"
 	}`
 
+	// Create config without temperature
 	configWithoutTemp := `{
 		"id": "bot124",
 		"telegram_token": "token124",
@@ -684,6 +715,7 @@ func TestTemperatureConfig(t *testing.T) {
 		"anthropic_api_key": "api_key_123"
 	}`
 
+	// Write config files
 	withTempPath := filepath.Join(tempDir, "with_temp.json")
 	if err := os.WriteFile(withTempPath, []byte(configWithTemp), 0644); err != nil {
 		t.Fatalf("Failed to write config with temperature: %v", err)
@@ -694,27 +726,35 @@ func TestTemperatureConfig(t *testing.T) {
 		t.Fatalf("Failed to write config without temperature: %v", err)
 	}
 
+	// Test loading config with temperature
 	configWithTempObj, err := loadConfig(withTempPath)
 	if err != nil {
 		t.Fatalf("Failed to load config with temperature: %v", err)
 	}
 
+	// Verify temperature is set correctly
 	if configWithTempObj.Temperature == nil {
 		t.Errorf("Expected Temperature to be set, got nil")
 	} else if *configWithTempObj.Temperature != 0.42 {
 		t.Errorf("Expected Temperature 0.42, got %f", *configWithTempObj.Temperature)
 	}
 
+	// Test loading config without temperature
 	configWithoutTempObj, err := loadConfig(withoutTempPath)
 	if err != nil {
 		t.Fatalf("Failed to load config without temperature: %v", err)
 	}
 
+	// Verify temperature is nil when not specified
 	if configWithoutTempObj.Temperature != nil {
 		t.Errorf("Expected Temperature to be nil, got %f", *configWithoutTempObj.Temperature)
 	}
 }
 
+// Additional tests can be added here to cover more scenarios
+
+// TestBotConfig_PersistModel verifies that PersistModel updates the model both in memory
+// and on disk while leaving all other config fields unchanged.
 func TestBotConfig_PersistModel(t *testing.T) { //NOSONAR go:S100 -- underscore separation is idiomatic in Go test names
 	tempDir, err := os.MkdirTemp("", "persist_model_test")
 	if err != nil {
@@ -744,14 +784,17 @@ func TestBotConfig_PersistModel(t *testing.T) { //NOSONAR go:S100 -- underscore
 		ConfigFilePath: configPath,
 	}
 
+	// Successful model update
 	if err := config.PersistModel("claude-sonnet-4-6"); err != nil {
 		t.Fatalf("PersistModel() unexpected error: %v", err)
 	}
 
+	// In-memory model must be updated immediately
 	if string(config.Model) != "claude-sonnet-4-6" {
 		t.Errorf("in-memory model: got %q, want %q", config.Model, "claude-sonnet-4-6")
 	}
 
+	// On-disk model must be updated; other fields must be preserved
 	data, err := os.ReadFile(configPath)
 	if err != nil {
 		t.Fatalf("Failed to read updated config file: %v", err)
@@ -767,111 +810,9 @@ func TestBotConfig_PersistModel(t *testing.T) { //NOSONAR go:S100 -- underscore
 		t.Errorf("on-disk id should be preserved: got %v, want %q", raw["id"], "bot1")
 	}
 
+	// Error case: empty ConfigFilePath must return an error
 	noPath := BotConfig{Model: "claude-v1"}
 	if err := noPath.PersistModel("claude-sonnet-4-6"); err == nil {
 		t.Error("PersistModel with empty ConfigFilePath: expected error, got nil")
 	}
 }
-
-func thinkingTestConfig(id string) BotConfig {
-	return BotConfig{
-		ID:              id,
-		TelegramToken:   "token-" + id,
-		MemorySize:      10,
-		MessagePerHour:  10,
-		MessagePerDay:   100,
-		TempBanDuration: "1h",
-		Model:           "claude-test",
-	}
-}
-
-func TestThinkingConfig(t *testing.T) {
-	cases := []struct {
-		name     string
-		thinking string
-		display  string
-		wantErr  string
-	}{
-		{"absent", "", "", ""},
-		{"adaptive", ThinkingModeAdaptive, "", ""},
-		{"disabled", ThinkingModeDisabled, "", ""},
-		{"adaptive summarized", ThinkingModeAdaptive, ThinkingDisplaySummarized, ""},
-		{"adaptive omitted", ThinkingModeAdaptive, ThinkingDisplayOmitted, ""},
-		{"legacy enabled rejected", "enabled", "", "invalid 'thinking'"},
-		{"case sensitive", "Adaptive", "", "invalid 'thinking'"},
-		{"unknown display", ThinkingModeAdaptive, "verbose", "invalid 'thinking_display'"},
-		{"display without thinking", "", ThinkingDisplaySummarized, "'thinking_display' requires"},
-		{"display with disabled", ThinkingModeDisabled, ThinkingDisplayOmitted, "'thinking_display' requires"},
-	}
-	for i, tc := range cases {
-		t.Run(tc.name, func(t *testing.T) {
-			cfg := thinkingTestConfig(fmt.Sprintf("bot-think-%d", i))
-			cfg.Thinking = tc.thinking
-			cfg.ThinkingDisplay = tc.display
-			err := validateConfig(&cfg, map[string]bool{}, map[string]bool{})
-			if tc.wantErr == "" {
-				if err != nil {
-					t.Fatalf("validateConfig(thinking=%q display=%q) = %v, want nil", tc.thinking, tc.display, err)
-				}
-				return
-			}
-			if err == nil {
-				t.Fatalf("validateConfig(thinking=%q display=%q) = nil, want error containing %q", tc.thinking, tc.display, tc.wantErr)
-			}
-			if !contains(err.Error(), tc.wantErr) {
-				t.Errorf("error %q does not contain %q", err.Error(), tc.wantErr)
-			}
-		})
-	}
-}
-
-func TestMaxTokensConfig(t *testing.T) {
-	var withValue BotConfig
-	if err := json.Unmarshal([]byte(`{"max_tokens": 4000}`), &withValue); err != nil {
-		t.Fatalf("unmarshal: %v", err)
-	}
-	if withValue.MaxTokens != 4000 {
-		t.Errorf("MaxTokens = %d, want 4000", withValue.MaxTokens)
-	}
-
-	var withoutValue BotConfig
-	if err := json.Unmarshal([]byte(`{}`), &withoutValue); err != nil {
-		t.Fatalf("unmarshal: %v", err)
-	}
-	if withoutValue.MaxTokens != 0 {
-		t.Errorf("MaxTokens = %d, want 0 when absent", withoutValue.MaxTokens)
-	}
-
-	neg := thinkingTestConfig("bot-maxtok-neg")
-	neg.MaxTokens = -1
-	if err := validateConfig(&neg, map[string]bool{}, map[string]bool{}); err == nil {
-		t.Error("validateConfig(max_tokens=-1) = nil, want error")
-	}
-	zero := thinkingTestConfig("bot-maxtok-zero")
-	zero.MaxTokens = 0
-	if err := validateConfig(&zero, map[string]bool{}, map[string]bool{}); err != nil {
-		t.Errorf("validateConfig(max_tokens=0) = %v, want nil", err)
-	}
-}
-
-func TestThinkingConfigLoad(t *testing.T) {
-	jsonData := `{
-		"id": "bot-think-load",
-		"thinking": "adaptive",
-		"thinking_display": "omitted",
-		"max_tokens": 4096
-	}`
-	var cfg BotConfig
-	if err := json.Unmarshal([]byte(jsonData), &cfg); err != nil {
-		t.Fatalf("unmarshal: %v", err)
-	}
-	if cfg.Thinking != ThinkingModeAdaptive {
-		t.Errorf("Thinking = %q, want %q", cfg.Thinking, ThinkingModeAdaptive)
-	}
-	if cfg.ThinkingDisplay != ThinkingDisplayOmitted {
-		t.Errorf("ThinkingDisplay = %q, want %q", cfg.ThinkingDisplay, ThinkingDisplayOmitted)
-	}
-	if cfg.MaxTokens != 4096 {
-		t.Errorf("MaxTokens = %d, want 4096", cfg.MaxTokens)
-	}
-}

database.go

@@ -38,11 +38,17 @@ func initDB() (*gorm.DB, error) {
 	}
 	sqlDB.SetMaxOpenConns(1)
 
+	// AutoMigrate the models
 	err = db.AutoMigrate(&BotModel{}, &ConfigModel{}, &Message{}, &User{}, &Role{}, &Scope{})
 	if err != nil {
 		return nil, fmt.Errorf("failed to migrate database schema: %w", err)
 	}
 
+	// Enforce unique owner per bot using raw SQL
+	// Note: SQLite doesn't support partial indexes, but we can simulate it by making a unique index on (BotID, IsOwner)
+	// and ensuring that IsOwner can only be true for one user per BotID.
+	// This approach allows multiple users with IsOwner=false for the same BotID,
+	// but only one user can have IsOwner=true per BotID.
 	err = db.Exec(`CREATE UNIQUE INDEX IF NOT EXISTS idx_bot_owner ON users (bot_id, is_owner) WHERE is_owner = 1;`).Error
 	if err != nil {
 		return nil, fmt.Errorf("failed to create unique index for bot owners: %w", err)
@@ -65,7 +71,7 @@ func createDefaultScopes(db *gorm.DB) error {
 		ScopeStatsViewOwn, ScopeStatsViewAny,
 		ScopeHistoryClearOwn, ScopeHistoryClearAny,
 		ScopeHistoryClearHardOwn, ScopeHistoryClearHardAny,
-		ScopeModelSet, ScopeUserPromote, ScopeTTSUse,
+		ScopeModelSet, ScopeUserPromote,
 	}
 	for _, name := range all {
 		if err := db.FirstOrCreate(&Scope{}, Scope{Name: name}).Error; err != nil {
@@ -82,11 +88,12 @@ func createDefaultScopes(db *gorm.DB) error {
 		ScopeStatsViewOwn, ScopeStatsViewAny,
 		ScopeHistoryClearOwn, ScopeHistoryClearAny,
 		ScopeHistoryClearHardOwn, ScopeHistoryClearHardAny,
-		ScopeModelSet, ScopeUserPromote, ScopeTTSUse,
+		ScopeModelSet, ScopeUserPromote,
 	}
 	assignments := map[string][]string{
 		"user":  userScopes,
 		"admin": elevatedScopes,
+		// owner gets the same scopes as admin; owner uniqueness is enforced by the IsOwner flag
 		"owner": elevatedScopes,
 	}
 	for roleName, scopes := range assignments {

elevenlabs.go

@@ -1,99 +0,0 @@
-package main
-
-import (
-	"bytes"
-	"context"
-	"encoding/json"
-	"fmt"
-	"io"
-	"mime/multipart"
-	"net/http"
-)
-
-const (
-	elevenLabsTTSURL       = "https://api.elevenlabs.io/v1/text-to-speech/"
-	elevenLabsSTTURL       = "https://api.elevenlabs.io/v1/speech-to-text"
-	elevenLabsDefaultModel = "eleven_multilingual_v2"
-)
-
-func (b *Bot) generateSpeech(ctx context.Context, text string) (io.Reader, error) {
-	model := b.config.ElevenLabsModel
-	if model == "" {
-		model = elevenLabsDefaultModel
-	}
-	body, err := json.Marshal(map[string]string{
-		"text":     text,
-		"model_id": model,
-	})
-	if err != nil {
-		return nil, fmt.Errorf("elevenlabs TTS marshal error: %w", err)
-	}
-	req, err := http.NewRequestWithContext(ctx, http.MethodPost,
-		elevenLabsTTSURL+b.config.ElevenLabsVoiceID, bytes.NewReader(body))
-	if err != nil {
-		return nil, fmt.Errorf("elevenlabs TTS request error: %w", err)
-	}
-	req.Header.Set("Content-Type", "application/json")
-	req.Header.Set("xi-api-key", b.config.ElevenLabsAPIKey)
-
-	resp, err := http.DefaultClient.Do(req)
-	if err != nil {
-		return nil, fmt.Errorf("elevenlabs TTS error: %w", err)
-	}
-	if resp.StatusCode != http.StatusOK {
-		defer func() { _ = resp.Body.Close() }()
-		errBody, _ := io.ReadAll(resp.Body)
-		return nil, fmt.Errorf("elevenlabs TTS error: status %d: %s", resp.StatusCode, errBody)
-	}
-	return resp.Body, nil
-}
-
-func (b *Bot) transcribeVoice(ctx context.Context, fileID string) (string, error) {
-	audioBytes, err := b.downloadTelegramFile(ctx, fileID)
-	if err != nil {
-		return "", err
-	}
-
-	var buf bytes.Buffer
-	mw := multipart.NewWriter(&buf)
-	if err := mw.WriteField("model_id", "scribe_v1"); err != nil {
-		return "", fmt.Errorf("multipart write error: %w", err)
-	}
-	part, err := mw.CreateFormFile("file", "audio.ogg")
-	if err != nil {
-		return "", fmt.Errorf("multipart create file error: %w", err)
-	}
-	if _, err := io.Copy(part, bytes.NewReader(audioBytes)); err != nil {
-		return "", fmt.Errorf("multipart copy error: %w", err)
-	}
-	if err := mw.Close(); err != nil {
-		return "", fmt.Errorf("multipart close error: %w", err)
-	}
-
-	req, err := http.NewRequestWithContext(ctx, http.MethodPost,
-		elevenLabsSTTURL, &buf)
-	if err != nil {
-		return "", fmt.Errorf("create STT request error: %w", err)
-	}
-	req.Header.Set("Content-Type", mw.FormDataContentType())
-	req.Header.Set("xi-api-key", b.config.ElevenLabsAPIKey)
-
-	sttResp, err := http.DefaultClient.Do(req)
-	if err != nil {
-		return "", fmt.Errorf("elevenlabs STT request error: %w", err)
-	}
-	defer func() { _ = sttResp.Body.Close() }()
-
-	if sttResp.StatusCode != http.StatusOK {
-		body, _ := io.ReadAll(sttResp.Body)
-		return "", fmt.Errorf("elevenlabs STT error: status %d: %s", sttResp.StatusCode, body)
-	}
-
-	var result struct {
-		Text string `json:"text"`
-	}
-	if err := json.NewDecoder(sttResp.Body).Decode(&result); err != nil {
-		return "", fmt.Errorf("elevenlabs STT decode error: %w", err)
-	}
-	return result.Text, nil
-}

go.mod

@@ -3,37 +3,21 @@ module github.com/HugeFrog24/go-telegram-bot
 go 1.26.0
 
 require (
-	github.com/anthropics/anthropic-sdk-go v1.57.0
-	github.com/go-telegram/bot v1.22.0
+	github.com/go-telegram/bot v1.19.0
+	github.com/liushuangls/go-anthropic/v2 v2.17.1
 	github.com/stretchr/testify v1.11.1
-	golang.org/x/sync v0.22.0
-	golang.org/x/time v0.15.0
+	golang.org/x/time v0.14.0
 	gorm.io/driver/sqlite v1.6.0
-	gorm.io/gorm v1.31.2
+	gorm.io/gorm v1.31.1
 )
 
 require (
-	github.com/bahlo/generic-list-go v0.2.0 // indirect
-	github.com/buger/jsonparser v1.2.0 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
-	github.com/invopop/jsonschema v0.14.0 // indirect
 	github.com/jinzhu/inflection v1.0.0 // indirect
 	github.com/jinzhu/now v1.1.5 // indirect
-	github.com/kr/pretty v0.3.1 // indirect
-	github.com/mailru/easyjson v0.9.2 // indirect
-	github.com/mattn/go-sqlite3 v1.14.48 // indirect
-	github.com/pb33f/ordered-map/v2 v2.3.1 // indirect
+	github.com/mattn/go-sqlite3 v1.14.34 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	github.com/rogpeppe/go-internal v1.14.1 // indirect
-	github.com/standard-webhooks/standard-webhooks/libraries v0.0.1 // indirect
 	github.com/stretchr/objx v0.5.3 // indirect
-	github.com/tidwall/gjson v1.19.0 // indirect
-	github.com/tidwall/match v1.2.0 // indirect
-	github.com/tidwall/pretty v1.2.1 // indirect
-	github.com/tidwall/sjson v1.2.5 // indirect
-	github.com/wk8/go-ordered-map/v2 v2.1.8 // indirect
-	go.yaml.in/yaml/v4 v4.0.0-rc.6 // indirect
-	golang.org/x/text v0.40.0 // indirect
-	gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c // indirect
+	golang.org/x/text v0.34.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -1,100 +1,30 @@
-github.com/anthropics/anthropic-sdk-go v1.45.0 h1:rWnpyBpm9OAm97jyH5bi6W4SRCwJeNY/RyhaJ7CHSUI=
-github.com/anthropics/anthropic-sdk-go v1.45.0/go.mod h1:bx5vWuHFuGPkELH8Z4KUiNSohFnUwScdpTyr+50myPo=
-github.com/anthropics/anthropic-sdk-go v1.52.0 h1:1TB9jt4DN87VMwS/hB1VK26tYzK0ipEOtqPaPGFtJQg=
-github.com/anthropics/anthropic-sdk-go v1.52.0/go.mod h1:3EfIfmFqxH6rbiLcIP4tPFyXL/IHakx2wDG4OU+TIEI=
-github.com/anthropics/anthropic-sdk-go v1.57.0 h1:iEAcPbUKfJ2Iqz9uN/jEndCNW2+x7OYLHDidXDhPjI0=
-github.com/anthropics/anthropic-sdk-go v1.57.0/go.mod h1:3EfIfmFqxH6rbiLcIP4tPFyXL/IHakx2wDG4OU+TIEI=
-github.com/bahlo/generic-list-go v0.2.0 h1:5sz/EEAK+ls5wF+NeqDpk5+iNdMDXrh3z3nPnH1Wvgk=
-github.com/bahlo/generic-list-go v0.2.0/go.mod h1:2KvAjgMlE5NNynlg/5iLrrCCZ2+5xWbdbCW3pNTGyYg=
-github.com/buger/jsonparser v1.2.0 h1:4EFcvK1kD4jyj6YqNK6skK6w+y7FHHBR+XBCtxwu/6g=
-github.com/buger/jsonparser v1.2.0/go.mod h1:6RYKKt7H4d4+iWqouImQ9R2FZql3VbhNgx27UK13J/0=
-github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/dnaeon/go-vcr v1.2.0 h1:zHCHvJYTMh1N7xnV7zf1m1GPBF9Ad0Jk/whtQ1663qI=
-github.com/dnaeon/go-vcr v1.2.0/go.mod h1:R4UdLID7HZT3taECzJs4YgbbH6PIGXB6W/sc5OLb6RQ=
-github.com/go-telegram/bot v1.20.0 h1:4Pea/qTidSspr4WBJw9FbHUMNhYeqszBqQUfsQEyFbc=
-github.com/go-telegram/bot v1.20.0/go.mod h1:i2TRs7fXWIeaceF3z7KzsMt/he0TwkVC680mvdTFYeM=
-github.com/go-telegram/bot v1.21.0 h1:Va/PbGc2vBDdv57GCUEEVV6ROlHWiC6SklJY9Hvhzps=
-github.com/go-telegram/bot v1.21.0/go.mod h1:i2TRs7fXWIeaceF3z7KzsMt/he0TwkVC680mvdTFYeM=
-github.com/go-telegram/bot v1.22.0 h1:zK29OoTYMmR5emJrCtGa2SjaGleeZiUB/C1i7kc2lXE=
-github.com/go-telegram/bot v1.22.0/go.mod h1:i2TRs7fXWIeaceF3z7KzsMt/he0TwkVC680mvdTFYeM=
-github.com/invopop/jsonschema v0.13.0 h1:KvpoAJWEjR3uD9Kbm2HWJmqsEaHt8lBUpd0qHcIi21E=
-github.com/invopop/jsonschema v0.13.0/go.mod h1:ffZ5Km5SWWRAIN6wbDXItl95euhFz2uON45H2qjYt+0=
-github.com/invopop/jsonschema v0.14.0 h1:MHQqLhvpNUZfw+hM3AZDYK7jxO8FZoQeQM77g8iyZjg=
-github.com/invopop/jsonschema v0.14.0/go.mod h1:ygm6C2EaVNMBDPpaPlnOA2pFAxBnxGjFlMZABxm9n2I=
+github.com/go-telegram/bot v1.19.0 h1:tuvTQhgNietHFRN0HUDhuXsgfgkGSaO8WWwZQW3DMQg=
+github.com/go-telegram/bot v1.19.0/go.mod h1:i2TRs7fXWIeaceF3z7KzsMt/he0TwkVC680mvdTFYeM=
 github.com/jinzhu/inflection v1.0.0 h1:K317FqzuhWc8YvSVlFMCCUb36O/S9MCKRDI7QkRKD/E=
 github.com/jinzhu/inflection v1.0.0/go.mod h1:h+uFLlag+Qp1Va5pdKtLDYj+kHp5pxUVkryuEj+Srlc=
 github.com/jinzhu/now v1.1.5 h1:/o9tlHleP7gOFmsnYNz3RGnqzefHA47wQpKrrdTIwXQ=
 github.com/jinzhu/now v1.1.5/go.mod h1:d3SSVoowX0Lcu0IBviAWJpolVfI5UJVZZ7cO71lE/z8=
-github.com/kr/pretty v0.2.1/go.mod h1:ipq/a2n7PKx3OHsz4KJII5eveXtPO4qwEXGdVfWzfnI=
-github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
-github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
-github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
-github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
-github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
-github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
-github.com/mailru/easyjson v0.9.2 h1:dX8U45hQsZpxd80nLvDGihsQ/OxlvTkVUXH2r/8cb2M=
-github.com/mailru/easyjson v0.9.2/go.mod h1:1+xMtQp2MRNVL/V1bOzuP3aP8VNwRW55fQUto+XFtTU=
-github.com/mattn/go-sqlite3 v1.14.44 h1:3VSe+xafpbzsLbdr2AWlAZk9yRHiBhTBakioXaCKTF8=
-github.com/mattn/go-sqlite3 v1.14.44/go.mod h1:pjEuOr8IwzLJP2MfGeTb0A35jauH+C2kbHKBr7yXKVQ=
-github.com/mattn/go-sqlite3 v1.14.47 h1:jOBI62gS7nKeZv+as1oGEy0+1qISgXwH/QBlR6KbfIo=
-github.com/mattn/go-sqlite3 v1.14.47/go.mod h1:6JTjA44L93a0QCyJef5YvlPoKXntQPjzWv5gtm9sB6w=
-github.com/mattn/go-sqlite3 v1.14.48 h1:7XHIgl0a8HwOaiK4E47ozLkST78rR9+OtNGx27D/TFs=
-github.com/mattn/go-sqlite3 v1.14.48/go.mod h1:6JTjA44L93a0QCyJef5YvlPoKXntQPjzWv5gtm9sB6w=
-github.com/pb33f/ordered-map/v2 v2.3.1 h1:5319HDO0aw4DA4gzi+zv4FXU9UlSs3xGZ40wcP1nBjY=
-github.com/pb33f/ordered-map/v2 v2.3.1/go.mod h1:qxFQgd0PkVUtOMCkTapqotNgzRhMPL7VvaHKbd1HnmQ=
-github.com/pkg/diff v0.0.0-20210226163009-20ebb0f2a09e/go.mod h1:pJLUxLENpZxwdsKMEsNbx1VGcRFpLqf3715MtcvvzbA=
+github.com/liushuangls/go-anthropic/v2 v2.17.1 h1:ca3oFzgQHs9/mJr+xx2XFQIYcQLM2rDCqieUx0g+8p4=
+github.com/liushuangls/go-anthropic/v2 v2.17.1/go.mod h1:a550cJXPoTG2FL3DvfKG2zzD5O2vjgvo4tHtoGPzFLU=
+github.com/mattn/go-sqlite3 v1.14.34 h1:3NtcvcUnFBPsuRcno8pUtupspG/GM+9nZ88zgJcp6Zk=
+github.com/mattn/go-sqlite3 v1.14.34/go.mod h1:Uh1q+B4BYcTPb+yiD3kU8Ct7aC0hY9fxUwlHK0RXw+Y=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/rogpeppe/go-internal v1.9.0/go.mod h1:WtVeX8xhTBvf0smdhujwtBcq4Qrzq/fJaraNFVN+nFs=
-github.com/rogpeppe/go-internal v1.14.1 h1:UQB4HGPB6osV0SQTLymcB4TgvyWu6ZyliaW0tI/otEQ=
-github.com/rogpeppe/go-internal v1.14.1/go.mod h1:MaRKkUm5W0goXpeCfT7UZI6fk/L7L7so1lCWt35ZSgc=
-github.com/standard-webhooks/standard-webhooks/libraries v0.0.1 h1:uOfcYT+3QungH6tIGSVCR/Y3KJmgJiHcojJbMTPDZAI=
-github.com/standard-webhooks/standard-webhooks/libraries v0.0.1/go.mod h1:L1MQhA6x4dn9r007T033lsaZMv9EmBAdXyU/+EF40fo=
 github.com/stretchr/objx v0.5.3 h1:jmXUvGomnU1o3W/V5h2VEradbpJDwGrzugQQvL0POH4=
 github.com/stretchr/objx v0.5.3/go.mod h1:rDQraq+vQZU7Fde9LOZLr8Tax6zZvy4kuNKF+QYS+U0=
 github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
 github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
-github.com/tidwall/gjson v1.14.2/go.mod h1:/wbyibRr2FHMks5tjHJ5F8dMZh3AcwJEMf5vlfC0lxk=
-github.com/tidwall/gjson v1.19.0 h1:xwxm7n691Uf3u5OFjzngavjGTh55KX5q/9w9xHW88JU=
-github.com/tidwall/gjson v1.19.0/go.mod h1:V37/opeE/JbLUOfH0QTXiNez2l0RUjYUhpT4szFQAfc=
-github.com/tidwall/match v1.1.1/go.mod h1:eRSPERbgtNPcGhD8UCthc6PmLEQXEWd3PRB5JTxsfmM=
-github.com/tidwall/match v1.2.0 h1:0pt8FlkOwjN2fPt4bIl4BoNxb98gGHN2ObFEDkrfZnM=
-github.com/tidwall/match v1.2.0/go.mod h1:eRSPERbgtNPcGhD8UCthc6PmLEQXEWd3PRB5JTxsfmM=
-github.com/tidwall/pretty v1.2.0/go.mod h1:ITEVvHYasfjBbM0u2Pg8T2nJnzm8xPwvNhhsoaGGjNU=
-github.com/tidwall/pretty v1.2.1 h1:qjsOFOWWQl+N3RsoF5/ssm1pHmJJwhjlSbZ51I6wMl4=
-github.com/tidwall/pretty v1.2.1/go.mod h1:ITEVvHYasfjBbM0u2Pg8T2nJnzm8xPwvNhhsoaGGjNU=
-github.com/tidwall/sjson v1.2.5 h1:kLy8mja+1c9jlljvWTlSazM7cKDRfJuR/bOJhcY5NcY=
-github.com/tidwall/sjson v1.2.5/go.mod h1:Fvgq9kS/6ociJEDnK0Fk1cpYF4FIW6ZF7LAe+6jwd28=
-github.com/wk8/go-ordered-map/v2 v2.1.8 h1:5h/BUHu93oj4gIdvHHHGsScSTMijfx5PeYkE/fJgbpc=
-github.com/wk8/go-ordered-map/v2 v2.1.8/go.mod h1:5nJHM5DyteebpVlHnWMV0rPz6Zp7+xBAnxjb1X5vnTw=
-go.yaml.in/yaml/v4 v4.0.0-rc.6 h1:1h7H1ohdUh93/FyE4YaDa1Zh64K6VVbjF4K6WUxMtH4=
-go.yaml.in/yaml/v4 v4.0.0-rc.6/go.mod h1:aZqd9kCMsGL7AuUv/m/PvWLdg5sjJsZ4oHDEnfPPfY0=
-golang.org/x/sync v0.20.0 h1:e0PTpb7pjO8GAtTs2dQ6jYa5BWYlMuX047Dco/pItO4=
-golang.org/x/sync v0.20.0/go.mod h1:9xrNwdLfx4jkKbNva9FpL6vEN7evnE43NNNJQ2LF3+0=
-golang.org/x/sync v0.21.0 h1:HLII4xRRTtCRkxYp4HNFF0Js/Og6q2i++KXbg0gHCwM=
-golang.org/x/sync v0.21.0/go.mod h1:9xrNwdLfx4jkKbNva9FpL6vEN7evnE43NNNJQ2LF3+0=
-golang.org/x/sync v0.22.0 h1:SZjpbeLmrCk4xhRSZFNZW5gFUeCeFgjekvI/+gfScek=
-golang.org/x/sync v0.22.0/go.mod h1:9xrNwdLfx4jkKbNva9FpL6vEN7evnE43NNNJQ2LF3+0=
-golang.org/x/text v0.37.0 h1:Cqjiwd9eSg8e0QAkyCaQTNHFIIzWtidPahFWR83rTrc=
-golang.org/x/text v0.37.0/go.mod h1:a5sjxXGs9hsn/AJVwuElvCAo9v8QYLzvavO5z2PiM38=
-golang.org/x/text v0.38.0 h1:sXmwo9DwP3OK9EZ7PqAdaooSGozfl/3a6/xJcbzPRhE=
-golang.org/x/text v0.38.0/go.mod h1:YXZt3QhHUKYT53r2lLKFIVi6Ao1jdzrTR/KQ09qyxF4=
-golang.org/x/text v0.40.0 h1:Ub2Z6/xjgF1WrYQz2nuITOEegKFtiIy+rieRJ5lHZKs=
-golang.org/x/text v0.40.0/go.mod h1:hpnzDAfGV753zIKo+wk3u1bVKCGPbrnF7+7LBF/UHVY=
-golang.org/x/time v0.15.0 h1:bbrp8t3bGUeFOx08pvsMYRTCVSMk89u4tKbNOZbp88U=
-golang.org/x/time v0.15.0/go.mod h1:Y4YMaQmXwGQZoFaVFk4YpCt4FLQMYKZe9oeV/f4MSno=
+golang.org/x/text v0.34.0 h1:oL/Qq0Kdaqxa1KbNeMKwQq0reLCCaFtqu2eNuSeNHbk=
+golang.org/x/text v0.34.0/go.mod h1:homfLqTYRFyVYemLBFl5GgL/DWEiH5wcsQ5gSh1yziA=
+golang.org/x/time v0.14.0 h1:MRx4UaLrDotUKUdCIqzPC48t1Y9hANFKIRpNx+Te8PI=
+golang.org/x/time v0.14.0/go.mod h1:eL/Oa2bBBK0TkX57Fyni+NgnyQQN4LitPmob2Hjnqw4=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
-gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
-gopkg.in/yaml.v2 v2.2.8 h1:obN1ZagJSUGI0Ek/LBmuj4SNLPfIny3KsKFopxRdj10=
-gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gorm.io/driver/sqlite v1.6.0 h1:WHRRrIiulaPiPFmDcod6prc4l2VGVWHz80KspNsxSfQ=
 gorm.io/driver/sqlite v1.6.0/go.mod h1:AO9V1qIQddBESngQUKWL9yoH93HIeA1X6V633rBwyT8=
 gorm.io/gorm v1.31.1 h1:7CA8FTFz/gRfgqgpeKIBcervUn3xSyPUmr6B2WXJ7kg=
 gorm.io/gorm v1.31.1/go.mod h1:XyQVbO2k6YkOis7C2437jSit3SsDK72s7n7rsSHd+Gs=
-gorm.io/gorm v1.31.2 h1:3o8FXNo9v9S858gil+3LlZA1LkCOzgb4g5BL64FgaCo=
-gorm.io/gorm v1.31.2/go.mod h1:XyQVbO2k6YkOis7C2437jSit3SsDK72s7n7rsSHd+Gs=

handlers.go

@@ -7,214 +7,22 @@ import (
 	"strconv"
 	"strings"
 
-	"github.com/anthropics/anthropic-sdk-go"
 	"github.com/go-telegram/bot"
 	"github.com/go-telegram/bot/models"
-	"golang.org/x/sync/errgroup"
+	"github.com/liushuangls/go-anthropic/v2"
 )
 
-func (b *Bot) handleVoiceMessage(ctx context.Context, message *models.Message, userMsg Message, chatID, userID int64, username, firstName, lastName string, isPremium bool, languageCode string, messageTime int, businessConnectionID string) {
-	if b.config.ElevenLabsAPIKey == "" {
-		if err := b.sendResponse(ctx, chatID, "I don't understand voice messages.", businessConnectionID); err != nil {
-			ErrorLogger.Printf("Error sending voice-unsupported message: %v", err)
-		}
-		return
-	}
-
-	if !b.hasScope(userID, ScopeTTSUse) {
-		if err := b.sendResponse(ctx, chatID, "You don't have permission to use voice features.", businessConnectionID); err != nil {
-			ErrorLogger.Printf("Error sending permission denied message: %v", err)
-		}
-		return
-	}
-
-	transcript, err := b.transcribeVoice(ctx, message.Voice.FileID)
-	if err != nil {
-		ErrorLogger.Printf("Error transcribing voice message from user %d: %v", userID, err)
-		if err := b.sendResponse(ctx, chatID, "Sorry, I couldn't understand your voice message.", businessConnectionID); err != nil {
-			ErrorLogger.Printf("Error sending transcription error message: %v", err)
-		}
-		return
-	}
-
-	if err := b.db.Model(&userMsg).Update("text", transcript).Error; err != nil {
-		ErrorLogger.Printf("Error updating voice transcript in DB: %v", err)
-	}
-	b.chatMemoriesMu.Lock()
-	if mem, exists := b.chatMemories[chatID]; exists {
-		for i := len(mem.Messages) - 1; i >= 0; i-- {
-			if mem.Messages[i].ID == userMsg.ID {
-				mem.Messages[i].Text = transcript
-				break
-			}
-		}
-	}
-	b.chatMemoriesMu.Unlock()
-
-	chatMemory := b.getOrCreateChatMemory(chatID)
-	contextMessages := b.prepareContextMessages(chatMemory)
-	response, err := b.getAnthropicResponse(ctx, chatID, contextMessages, false, username, firstName, lastName, isPremium, languageCode, messageTime, nil)
-	if err != nil {
-		ErrorLogger.Printf("Error getting Anthropic response for voice: %v", err)
-		if err := b.sendResponse(ctx, chatID, b.anthropicErrorResponse(err, userID), businessConnectionID); err != nil {
-			ErrorLogger.Printf("Error sending anthropic error response: %v", err)
-		}
-		return
-	}
-
-	audioReader, err := b.generateSpeech(ctx, response)
-	if err != nil {
-		ErrorLogger.Printf("Error generating speech, falling back to text: %v", err)
-		if err := b.sendResponse(ctx, chatID, response, businessConnectionID); err != nil {
-			ErrorLogger.Printf("Error sending text fallback: %v", err)
-		}
-		return
-	}
-
-	if _, err := b.screenOutgoingMessage(chatID, response); err != nil {
-		ErrorLogger.Printf("Error storing assistant voice response: %v", err)
-	}
-
-	params := &bot.SendAudioParams{
-		ChatID: chatID,
-		Audio:  &models.InputFileUpload{Filename: "response.mp3", Data: audioReader},
-	}
-	if businessConnectionID != "" {
-		params.BusinessConnectionID = businessConnectionID
-	}
-	if _, err := b.tgBot.SendAudio(ctx, params); err != nil {
-		ErrorLogger.Printf("Error sending audio to chat %d: %v", chatID, err)
-	}
-}
-
-func (b *Bot) uploadPhotoFromItem(ctx context.Context, item *models.Message, chatID int64) (string, error) {
-	photo := largestPhotoSize(item.Photo)
-	data, err := b.downloadTelegramFile(ctx, photo.FileID)
-	if err != nil {
-		return "", fmt.Errorf("download %s: %w", photo.FileID, err)
-	}
-	filename := formatUploadFilename(b.botID, chatID, item.ID, "jpg")
-	return b.uploadImageToAnthropic(ctx, data, filename, "image/jpeg")
-}
-
-func (b *Bot) handlePhotoMessage(
-	ctx context.Context,
-	items []*models.Message,
-	chatID, userID int64,
-	username, firstName, lastName string,
-	isPremium bool,
-	languageCode string,
-	messageTime int,
-	businessConnectionID string,
-) {
-	if len(items) == 0 {
-		return
-	}
-
-	uploaded := make([]string, len(items))
-	caption := ""
-	g, gctx := errgroup.WithContext(ctx)
-	for i, item := range items {
-		if item.Caption != "" {
-			caption = item.Caption
-		}
-		if len(item.Photo) == 0 {
-			continue
-		}
-		i, item := i, item
-		g.Go(func() error {
-			fileID, err := b.uploadPhotoFromItem(gctx, item, chatID)
-			if err != nil {
-				return err
-			}
-			uploaded[i] = fileID
-			return nil
-		})
-	}
-	if err := g.Wait(); err != nil {
-		ErrorLogger.Printf("[%s] photo upload failed: %v", b.config.ID, err)
-		var successful []string
-		for _, fid := range uploaded {
-			if fid != "" {
-				successful = append(successful, fid)
-			}
-		}
-		b.compensatingDelete(ctx, successful)
-		if sendErr := b.sendResponse(ctx, chatID, "Sorry, I couldn't process one of your images.", businessConnectionID); sendErr != nil {
-			ErrorLogger.Printf("Error sending photo failure message: %v", sendErr)
-		}
-		return
-	}
-	finalUploaded := make([]string, 0, len(uploaded))
-	for _, fid := range uploaded {
-		if fid != "" {
-			finalUploaded = append(finalUploaded, fid)
-		}
-	}
-	if len(finalUploaded) == 0 {
-		return
-	}
-
-	chatMemory := b.getOrCreateChatMemory(chatID)
-	userMessage := b.createMessage(chatID, userID, username, "user", caption, true)
-	userMessage.ImageFileIDs = finalUploaded
-	if err := b.storeMessage(&userMessage); err != nil {
-		b.compensatingDelete(ctx, finalUploaded)
-		ErrorLogger.Printf("[%s] store photo message failed: %v", b.config.ID, err)
-		if sendErr := b.sendResponse(ctx, chatID, "Sorry, I had trouble saving your message.", businessConnectionID); sendErr != nil {
-			ErrorLogger.Printf("Error sending store failure message: %v", sendErr)
-		}
-		return
-	}
-	b.addMessageToChatMemory(chatMemory, userMessage)
-
-	contextMessages := b.prepareContextMessages(chatMemory)
-	joined, err := b.getAnthropicResponse(
-		ctx, chatID, contextMessages, false,
-		username, firstName, lastName, isPremium, languageCode, messageTime,
-		func(seg string) error {
-			return b.sendOneSegment(ctx, chatID, seg, businessConnectionID)
-		},
-	)
-	if err != nil {
-		ErrorLogger.Printf("Error getting Anthropic response for photo: %v", err)
-		if sendErr := b.sendResponse(ctx, chatID, b.anthropicErrorResponse(err, userID), businessConnectionID); sendErr != nil {
-			ErrorLogger.Printf("Error sending anthropic error response: %v", sendErr)
-		}
-		return
-	}
-	if _, storeErr := b.screenOutgoingMessage(chatID, joined); storeErr != nil {
-		ErrorLogger.Printf("Error recording assistant turn: %v", storeErr)
-	}
-}
-
+// anthropicErrorResponse returns the message to send back to the user when getAnthropicResponse
+// fails. Admins and owners receive an actionable hint when the model is deprecated; regular users
+// always get the generic fallback to avoid leaking internal details.
 func (b *Bot) anthropicErrorResponse(err error, userID int64) string {
-	isElevated := b.hasScope(userID, ScopeModelSet)
-
-	if errors.Is(err, ErrModelNotFound) && isElevated {
+	if errors.Is(err, ErrModelNotFound) && b.hasScope(userID, ScopeModelSet) {
 		return fmt.Sprintf(
 			"⚠️ Model `%s` is no longer available (deprecated or removed by Anthropic).\n"+
 				"Use /set_model <model-id> to switch. Current models: https://platform.claude.com/docs/en/about-claude/models/overview",
 			b.config.Model,
 		)
 	}
-
-	if isElevated {
-		var apiErr *anthropic.Error
-		if errors.As(err, &apiErr) {
-			body := apiErr.RawJSON()
-			if len(body) > 800 {
-				body = body[:800] + "...(truncated)"
-			}
-			out := fmt.Sprintf("⚠️ Anthropic API error %d:\n%s", apiErr.StatusCode, body)
-			if apiErr.RequestID != "" {
-				out += fmt.Sprintf("\nRequest-ID: %s", apiErr.RequestID)
-			}
-			return out
-		}
-		return fmt.Sprintf("⚠️ Anthropic call failed: %v", err)
-	}
-
 	return "I'm sorry, I'm having trouble processing your request right now."
 }
 
@@ -226,9 +34,11 @@ func (b *Bot) handleUpdate(ctx context.Context, tgBot *bot.Bot, update *models.U
 	} else if update.BusinessMessage != nil {
 		message = update.BusinessMessage
 	} else {
+		// No message to process
 		return
 	}
 
+	// Extract businessConnectionID if available
 	var businessConnectionID string
 	if update.BusinessConnection != nil {
 		businessConnectionID = update.BusinessConnection.ID
@@ -237,6 +47,8 @@ func (b *Bot) handleUpdate(ctx context.Context, tgBot *bot.Bot, update *models.U
 	}
 
 	if message.From == nil {
+		// Channel posts and some automated messages have no sender — ignore them.
+		// see: https://core.telegram.org/bots/api#message
 		return
 	}
 
@@ -250,17 +62,31 @@ func (b *Bot) handleUpdate(ctx context.Context, tgBot *bot.Bot, update *models.U
 	messageTime := message.Date
 	text := message.Text
 
+	// Check if it's a new chat (before storing the message so the flag is accurate).
+	isNewChatFlag := b.isNewChat(chatID)
+
+	// Screen incoming message (store to DB + add to chat memory)
+	userMsg, err := b.screenIncomingMessage(message)
+	if err != nil {
+		ErrorLogger.Printf("Error storing user message: %v", err)
+		return
+	}
+
+	// Determine if the user is the owner
 	var isOwner bool
-	if b.db.Where("telegram_id = ? AND bot_id = ? AND is_owner = ?", userID, b.botID, true).First(&User{}).Error == nil {
+	err = b.db.Where("telegram_id = ? AND bot_id = ? AND is_owner = ?", userID, b.botID, true).First(&User{}).Error
+	if err == nil {
 		isOwner = true
 	}
 
+	// Always create/get the user record — on the very first message and on all subsequent ones.
 	user, err := b.getOrCreateUser(userID, username, isOwner)
 	if err != nil {
 		ErrorLogger.Printf("Error getting or creating user: %v", err)
 		return
 	}
 
+	// Update the username if it has changed
 	if user.Username != username {
 		user.Username = username
 		if err := b.db.Save(&user).Error; err != nil {
@@ -268,45 +94,27 @@ func (b *Bot) handleUpdate(ctx context.Context, tgBot *bot.Bot, update *models.U
 		}
 	}
 
-	if message.MediaGroupID != "" && len(message.Photo) > 0 {
-		b.bufferAlbumItem(ctx, message, chatID, userID, username, firstName, lastName,
-			isPremium, languageCode, messageTime, businessConnectionID)
-		return
-	}
-	if len(message.Photo) > 0 {
-		if !b.checkRateLimits(userID) {
-			b.sendRateLimitExceededMessage(ctx, chatID, businessConnectionID)
-			return
-		}
-		b.handlePhotoMessage(ctx, []*models.Message{message},
-			chatID, userID, username, firstName, lastName,
-			isPremium, languageCode, messageTime,
-			businessConnectionID)
-		return
-	}
-
-	userMsg, err := b.screenIncomingMessage(message)
-	if err != nil {
-		ErrorLogger.Printf("Error storing user message: %v", err)
-		return
-	}
-
+	// Check if the message is a command — applies on every message, including the very first.
 	if message.Entities != nil {
 		for _, entity := range message.Entities {
 			if entity.Type == "bot_command" {
 				command := strings.TrimSpace(message.Text[entity.Offset : entity.Offset+entity.Length])
 				switch command {
 				case "/stats":
+					// Parse command parameters
 					parts := strings.Fields(message.Text)
 
+					// Default: show global stats
 					if len(parts) == 1 {
 						b.sendStats(ctx, chatID, userID, 0, businessConnectionID)
 						return
 					}
 
+					// Check for "user" parameter
 					if len(parts) >= 2 && parts[1] == "user" {
-						targetUserID := userID
+						targetUserID := userID // Default to current user
 
+						// If a user ID is provided, parse it
 						if len(parts) >= 3 {
 							var parseErr error
 							targetUserID, parseErr = strconv.ParseInt(parts[2], 10, 64)
@@ -323,6 +131,7 @@ func (b *Bot) handleUpdate(ctx context.Context, tgBot *bot.Bot, update *models.U
 						return
 					}
 
+					// Invalid parameter
 					if err := b.sendResponse(ctx, chatID, "Invalid command format. Usage: /stats or /stats user [user_id]", businessConnectionID); err != nil {
 						ErrorLogger.Printf("Error sending response: %v", err)
 					}
@@ -372,6 +181,11 @@ func (b *Bot) handleUpdate(ctx context.Context, tgBot *bot.Bot, update *models.U
 						return
 					}
 					newModel := strings.TrimSpace(parts[1])
+					// No upfront model validation:
+					// - The go-anthropic library constants are not enumerable at runtime (Go has no const reflection).
+					// - A live /v1/models probe would add a network round-trip and show in the API audit log.
+					// - An invalid model ID will produce a 404 on the next real message, which routes through
+					//   anthropicErrorResponse and already delivers an actionable admin-facing hint.
 					if err := b.config.PersistModel(newModel); err != nil {
 						ErrorLogger.Printf("Failed to persist model change: %v", err)
 						if err := b.sendResponse(ctx, chatID, fmt.Sprintf("Model updated in memory to `%s`, but failed to save to config file: %v", newModel, err), businessConnectionID); err != nil {
@@ -416,48 +230,42 @@ func (b *Bot) handleUpdate(ctx context.Context, tgBot *bot.Bot, update *models.U
 		}
 	}
 
+	// Rate limit check applies to all message types including stickers.
 	if !b.checkRateLimits(userID) {
 		b.sendRateLimitExceededMessage(ctx, chatID, businessConnectionID)
 		return
 	}
 
-	if message.Voice != nil {
-		b.handleVoiceMessage(ctx, message, userMsg, chatID, userID, username, firstName, lastName, isPremium, languageCode, messageTime, businessConnectionID)
-		return
-	}
-
+	// Build context once — shared by the sticker and text response paths.
 	chatMemory := b.getOrCreateChatMemory(chatID)
 	contextMessages := b.prepareContextMessages(chatMemory)
 
+	// Check if the message contains a sticker
 	if message.Sticker != nil {
 		b.handleStickerMessage(ctx, chatID, userMsg, message, contextMessages, businessConnectionID)
 		return
 	}
 
+	// Proceed only if the message contains text
 	if text == "" {
 		InfoLogger.Printf("Received a non-text message from user %d in chat %d", userID, chatID)
 		return
 	}
 
+	// Determine if the text contains only emojis
 	isEmojiOnly := isOnlyEmojis(text)
 
-	joined, err := b.getAnthropicResponse(
-		ctx, chatID, contextMessages, isEmojiOnly,
-		username, firstName, lastName, isPremium, languageCode, messageTime,
-		func(seg string) error {
-			return b.sendOneSegment(ctx, chatID, seg, businessConnectionID)
-		},
-	)
+	// Get response from Anthropic
+	response, err := b.getAnthropicResponse(ctx, contextMessages, isNewChatFlag, isOwner, isEmojiOnly, username, firstName, lastName, isPremium, languageCode, messageTime)
 	if err != nil {
 		ErrorLogger.Printf("Error getting Anthropic response: %v", err)
-		if sendErr := b.sendResponse(ctx, chatID, b.anthropicErrorResponse(err, userID), businessConnectionID); sendErr != nil {
-			ErrorLogger.Printf("Error sending response: %v", sendErr)
-		}
-		return
+		response = b.anthropicErrorResponse(err, userID)
 	}
 
-	if _, storeErr := b.screenOutgoingMessage(chatID, joined); storeErr != nil {
-		ErrorLogger.Printf("Error recording assistant turn: %v", storeErr)
+	// Send the response
+	if err := b.sendResponse(ctx, chatID, response, businessConnectionID); err != nil {
+		ErrorLogger.Printf("Error sending response: %v", err)
+		return
 	}
 }
 
@@ -467,11 +275,14 @@ func (b *Bot) sendRateLimitExceededMessage(ctx context.Context, chatID int64, bu
 	}
 }
 
-func (b *Bot) handleStickerMessage(ctx context.Context, chatID int64, userMessage Message, message *models.Message, contextMessages []anthropic.BetaMessageParam, businessConnectionID string) {
+func (b *Bot) handleStickerMessage(ctx context.Context, chatID int64, userMessage Message, message *models.Message, contextMessages []anthropic.Message, businessConnectionID string) {
+	// userMessage was already screened (stored + added to memory) by handleUpdate — do not call screenIncomingMessage again.
 
+	// Generate AI response about the sticker
 	response, err := b.generateStickerResponse(ctx, userMessage, contextMessages)
 	if err != nil {
 		ErrorLogger.Printf("Error generating sticker response: %v", err)
+		// Provide a fallback dynamic response based on sticker type
 		if message.Sticker.IsAnimated {
 			response = "Wow, that's a cool animated sticker!"
 		} else if message.Sticker.IsVideo {
@@ -481,16 +292,19 @@ func (b *Bot) handleStickerMessage(ctx context.Context, chatID int64, userMessag
 		}
 	}
 
+	// Send the response
 	if err := b.sendResponse(ctx, chatID, response, businessConnectionID); err != nil {
 		ErrorLogger.Printf("Error sending response: %v", err)
 		return
 	}
 }
 
-func (b *Bot) generateStickerResponse(ctx context.Context, message Message, contextMessages []anthropic.BetaMessageParam) (string, error) {
+func (b *Bot) generateStickerResponse(ctx context.Context, message Message, contextMessages []anthropic.Message) (string, error) {
+	// contextMessages already contains the sticker turn (added by screenIncomingMessage as
+	// "Sent a sticker: <emoji>"), so the full conversation history is preserved.
 	if message.StickerFileID != "" {
 		messageTime := int(message.Timestamp.Unix())
-		response, err := b.getAnthropicResponse(ctx, message.ChatID, contextMessages, true, message.Username, "", "", false, "", messageTime, nil)
+		response, err := b.getAnthropicResponse(ctx, contextMessages, false, false, true, message.Username, "", "", false, "", messageTime)
 		if err != nil {
 			return "", err
 		}
@@ -501,6 +315,7 @@ func (b *Bot) generateStickerResponse(ctx context.Context, message Message, cont
 }
 
 func (b *Bot) clearChatHistory(ctx context.Context, chatID int64, currentUserID int64, targetUserID int64, targetChatID int64, businessConnectionID string, hardDelete bool) {
+	// If targetUserID is provided and different from currentUserID, check permissions
 	if targetUserID != 0 && targetUserID != currentUserID {
 		requiredScope := ScopeHistoryClearAny
 		if hardDelete {
@@ -514,6 +329,7 @@ func (b *Bot) clearChatHistory(ctx context.Context, chatID int64, currentUserID
 			return
 		}
 
+		// Check if the target user exists
 		var targetUser User
 		err := b.db.Where("telegram_id = ? AND bot_id = ?", targetUserID, b.botID).First(&targetUser).Error
 		if err != nil {
@@ -524,34 +340,58 @@ func (b *Bot) clearChatHistory(ctx context.Context, chatID int64, currentUserID
 			return
 		}
 	} else {
+		// If no targetUserID is provided, set it to currentUserID
 		targetUserID = currentUserID
 	}
 
+	// Delete messages from the database
+	//
+	// Assumption: this bot is primarily used in private DMs, where each user's messages
+	// are stored with chat_id == their own user_id — not the caller's chat_id. Scoping
+	// a cross-user delete by the caller's chatID would therefore match 0 rows.
+	//
+	// When clearing another user's history the default (targetChatID == 0) deletes all
+	// of that user's messages across every chat for this bot — the natural meaning of
+	// "/clear <userID>" (wipe their entire history with the bot).
+	//
+	// When targetChatID != 0 the deletion is scoped to that specific chat, which is
+	// useful for group moderation ("/clear <userID> <chatID>").
 	var err error
 	if hardDelete {
+		// Permanently delete messages
 		if targetUserID == currentUserID {
-			err = b.hardDeleteScope(ctx, "chat_id = ? AND bot_id = ?", chatID, b.botID)
+			// Own history — delete ALL messages (user + assistant) in the current chat.
+			err = b.db.Unscoped().Where("chat_id = ? AND bot_id = ?", chatID, b.botID).Delete(&Message{}).Error
 			InfoLogger.Printf("User %d permanently deleted their own chat history in chat %d", currentUserID, chatID)
 		} else {
 			if targetChatID != 0 {
-				err = b.hardDeleteScope(ctx, "chat_id = ? AND bot_id = ?", targetChatID, b.botID)
+				// Chat-scoped: delete ALL messages (user + assistant) in the specified chat.
+				err = b.db.Unscoped().Where("chat_id = ? AND bot_id = ?", targetChatID, b.botID).Delete(&Message{}).Error
 				InfoLogger.Printf("Admin/owner %d permanently deleted chat history for user %d in chat %d", currentUserID, targetUserID, targetChatID)
 			} else {
-				err = b.hardDeleteScope(ctx,
-					"bot_id = ? AND (user_id = ? OR (chat_id = ? AND is_user = ?))",
-					b.botID, targetUserID, targetUserID, false)
+				// Bot-wide: delete all of the user's own messages across every chat, then delete
+				// assistant messages from their DM chat (where chat_id == user_id by Telegram convention).
+				err = b.db.Unscoped().Where("bot_id = ? AND user_id = ?", b.botID, targetUserID).Delete(&Message{}).Error
+				if err == nil {
+					err = b.db.Unscoped().Where("chat_id = ? AND bot_id = ? AND is_user = ?", targetUserID, b.botID, false).Delete(&Message{}).Error
+				}
 				InfoLogger.Printf("Admin/owner %d permanently deleted all chat history for user %d", currentUserID, targetUserID)
 			}
 		}
 	} else {
+		// Soft delete messages
 		if targetUserID == currentUserID {
+			// Own history — delete ALL messages (user + assistant) in the current chat.
 			err = b.db.Where("chat_id = ? AND bot_id = ?", chatID, b.botID).Delete(&Message{}).Error
 			InfoLogger.Printf("User %d soft deleted their own chat history in chat %d", currentUserID, chatID)
 		} else {
 			if targetChatID != 0 {
+				// Chat-scoped: delete ALL messages (user + assistant) in the specified chat.
 				err = b.db.Where("chat_id = ? AND bot_id = ?", targetChatID, b.botID).Delete(&Message{}).Error
 				InfoLogger.Printf("Admin/owner %d soft deleted chat history for user %d in chat %d", currentUserID, targetUserID, targetChatID)
 			} else {
+				// Bot-wide: delete all of the user's own messages across every chat, then delete
+				// assistant messages from their DM chat (where chat_id == user_id by Telegram convention).
 				err = b.db.Where("bot_id = ? AND user_id = ?", b.botID, targetUserID).Delete(&Message{}).Error
 				if err == nil {
 					err = b.db.Where("chat_id = ? AND bot_id = ? AND is_user = ?", targetUserID, b.botID, false).Delete(&Message{}).Error
@@ -569,20 +409,28 @@ func (b *Bot) clearChatHistory(ctx context.Context, chatID int64, currentUserID
 		return
 	}
 
+	// Evict the relevant in-memory cache entry so the next access rebuilds from
+	// the now-clean DB. Applies to all cases: own history, cross-user
+	// scoped to a specific chat, and bot-wide cross-user clear.
 	b.chatMemoriesMu.Lock()
 	if targetUserID == currentUserID {
+		// Own history is always scoped to the current chat.
 		delete(b.chatMemories, chatID)
 	} else if targetChatID != 0 {
+		// Admin cleared a specific chat — evict that chat's cache.
 		delete(b.chatMemories, targetChatID)
 	} else {
+		// Bot-wide clear: primary use-case is DMs where chatID == userID.
 		delete(b.chatMemories, targetUserID)
 	}
 	b.chatMemoriesMu.Unlock()
 
+	// Send a confirmation message
 	var confirmationMessage string
 	if targetUserID == currentUserID {
 		confirmationMessage = "Your chat history has been cleared."
 	} else {
+		// Get the username of the target user if available
 		var targetUser User
 		err := b.db.Where("telegram_id = ? AND bot_id = ?", targetUserID, b.botID).First(&targetUser).Error
 		if err == nil && targetUser.Username != "" {

handlers_test.go

@@ -17,6 +17,7 @@ import (
 )
 
 func TestHandleUpdate_NewChat(t *testing.T) {
+	// Setup
 	db := setupTestDB(t)
 	mockClock := &MockClock{
 		currentTime: time.Now(),
@@ -24,7 +25,7 @@ func TestHandleUpdate_NewChat(t *testing.T) {
 
 	config := BotConfig{
 		ID:              "test_bot",
-		OwnerTelegramID: 123,
+		OwnerTelegramID: 123, // owner's ID
 		TelegramToken:   "test_token",
 		MemorySize:      10,
 		MessagePerHour:  5,
@@ -36,6 +37,7 @@ func TestHandleUpdate_NewChat(t *testing.T) {
 
 	mockTgClient := &MockTelegramClient{}
 
+	// Create bot model first
 	botModel := &BotModel{
 		Identifier: config.ID,
 		Name:       config.ID,
@@ -43,6 +45,7 @@ func TestHandleUpdate_NewChat(t *testing.T) {
 	err := db.Create(botModel).Error
 	assert.NoError(t, err)
 
+	// Create bot config
 	configModel := &ConfigModel{
 		BotID:           botModel.ID,
 		MemorySize:      config.MemorySize,
@@ -56,34 +59,40 @@ func TestHandleUpdate_NewChat(t *testing.T) {
 	err = db.Create(configModel).Error
 	assert.NoError(t, err)
 
+	// Create bot instance
 	b, err := NewBot(db, config, mockClock, mockTgClient)
 	assert.NoError(t, err)
 
 	testCases := []struct {
-		name       string
-		userID     int64
-		wantSubstr string
+		name     string
+		userID   int64
+		isOwner  bool
+		wantResp string
 	}{
 		{
-			name:       "Owner First Message",
-			userID:     123,
-			wantSubstr: "Anthropic call failed:",
+			name:     "Owner First Message",
+			userID:   123, // owner's ID
+			isOwner:  true,
+			wantResp: "I'm sorry, I'm having trouble processing your request right now.",
 		},
 		{
-			name:       "Regular User First Message",
-			userID:     456,
-			wantSubstr: "I'm sorry, I'm having trouble processing your request right now.",
+			name:     "Regular User First Message",
+			userID:   456,
+			isOwner:  false,
+			wantResp: "I'm sorry, I'm having trouble processing your request right now.",
 		},
 	}
 
 	for _, tc := range testCases {
 		t.Run(tc.name, func(t *testing.T) {
+			// Setup mock response expectations for error case to test fallback messages
 			mockTgClient.SendMessageFunc = func(ctx context.Context, params *bot.SendMessageParams) (*models.Message, error) {
 				assert.Equal(t, tc.userID, params.ChatID)
-				assert.Contains(t, params.Text, tc.wantSubstr)
+				assert.Equal(t, tc.wantResp, params.Text)
 				return &models.Message{}, nil
 			}
 
+			// Create update with new message
 			update := &models.Update{
 				Message: &models.Message{
 					Chat: models.Chat{ID: tc.userID},
@@ -95,23 +104,24 @@ func TestHandleUpdate_NewChat(t *testing.T) {
 				},
 			}
 
+			// Handle the update
 			b.handleUpdate(context.Background(), nil, update)
 
+			// Verify message was stored
 			var storedMsg Message
 			err := db.Where("chat_id = ? AND user_id = ? AND text = ?", tc.userID, tc.userID, "Hello").First(&storedMsg).Error
 			assert.NoError(t, err)
 
+			// Verify response was stored
 			var respMsg Message
-			err = db.Where("chat_id = ? AND is_user = ?", tc.userID, false).
-				Order("timestamp DESC").
-				First(&respMsg).Error
+			err = db.Where("chat_id = ? AND is_user = ? AND text = ?", tc.userID, false, tc.wantResp).First(&respMsg).Error
 			assert.NoError(t, err)
-			assert.Contains(t, respMsg.Text, tc.wantSubstr)
 		})
 	}
 }
 
 func TestClearChatHistory(t *testing.T) {
+	// Setup
 	db := setupTestDB(t)
 	mockClock := &MockClock{
 		currentTime: time.Now(),
@@ -119,7 +129,7 @@ func TestClearChatHistory(t *testing.T) {
 
 	config := BotConfig{
 		ID:              "test_bot",
-		OwnerTelegramID: 123,
+		OwnerTelegramID: 123, // owner's ID
 		TelegramToken:   "test_token",
 		MemorySize:      10,
 		MessagePerHour:  5,
@@ -131,6 +141,7 @@ func TestClearChatHistory(t *testing.T) {
 
 	mockTgClient := &MockTelegramClient{}
 
+	// Create bot model first
 	botModel := &BotModel{
 		Identifier: config.ID,
 		Name:       config.ID,
@@ -138,6 +149,7 @@ func TestClearChatHistory(t *testing.T) {
 	err := db.Create(botModel).Error
 	assert.NoError(t, err)
 
+	// Create bot config
 	configModel := &ConfigModel{
 		BotID:           botModel.ID,
 		MemorySize:      config.MemorySize,
@@ -151,18 +163,22 @@ func TestClearChatHistory(t *testing.T) {
 	err = db.Create(configModel).Error
 	assert.NoError(t, err)
 
+	// Create bot instance
 	b, err := NewBot(db, config, mockClock, mockTgClient)
 	assert.NoError(t, err)
 
+	// Create test users
 	ownerID := int64(123)
 	adminID := int64(456)
 	regularUserID := int64(789)
 	nonExistentUserID := int64(999)
 	chatID := int64(1000)
 
+	// Create admin role
 	adminRole, err := b.getRoleByName("admin")
 	assert.NoError(t, err)
 
+	// Create admin user
 	adminUser := User{
 		BotID:      b.botID,
 		TelegramID: adminID,
@@ -174,6 +190,7 @@ func TestClearChatHistory(t *testing.T) {
 	err = db.Create(&adminUser).Error
 	assert.NoError(t, err)
 
+	// Create regular user
 	regularRole, err := b.getRoleByName("user")
 	assert.NoError(t, err)
 	regularUser := User{
@@ -187,11 +204,15 @@ func TestClearChatHistory(t *testing.T) {
 	err = db.Create(&regularUser).Error
 	assert.NoError(t, err)
 
+	// Create test messages for each user.
+	// Each user's messages are stored with chat_id == their own user_id, mirroring
+	// how Telegram private DMs work (chat_id == user_id in 1-on-1 bot conversations).
+	// Using a shared artificial chatID here would mask the cross-user delete bug.
 	for _, userID := range []int64{ownerID, adminID, regularUserID} {
 		for i := 0; i < 5; i++ {
 			message := Message{
 				BotID:     b.botID,
-				ChatID:    userID,
+				ChatID:    userID, // per-user chat, not a shared chatID
 				UserID:    userID,
 				Username:  "test",
 				UserRole:  "user",
@@ -204,6 +225,7 @@ func TestClearChatHistory(t *testing.T) {
 		}
 	}
 
+	// Test cases
 	testCases := []struct {
 		name           string
 		currentUserID  int64
@@ -266,7 +288,7 @@ func TestClearChatHistory(t *testing.T) {
 			targetUserID:  adminID,
 			hardDelete:    false,
 			expectedError: true,
-			expectedCount: 5,
+			expectedCount: 5, // Messages should remain
 			expectedMsg:   "Permission denied. Only admins and owners can clear other users' histories.",
 		},
 		{
@@ -275,7 +297,7 @@ func TestClearChatHistory(t *testing.T) {
 			targetUserID:  nonExistentUserID,
 			hardDelete:    false,
 			expectedError: true,
-			expectedCount: 5,
+			expectedCount: 5, // Messages should remain for admin
 			expectedMsg:   "User with ID 999 not found.",
 		},
 		{
@@ -288,23 +310,29 @@ func TestClearChatHistory(t *testing.T) {
 			expectedMsg:   "Chat history for user @regular (ID: 789) has been cleared.",
 		},
 		{
+			// targetChatID scopes the delete to a specific chat; messages in other chats survive.
+			// We seed messages with ChatID == userID (per-user DM), so targeting a different chatID
+			// should leave the user's messages untouched (expectedCount == 5).
 			name:          "Admin clears regular user's history scoped to non-matching chat",
 			currentUserID: adminID,
 			targetUserID:  regularUserID,
-			targetChatID:  int64(9999),
+			targetChatID:  int64(9999), // a chat the user has no messages in
 			hardDelete:    false,
 			expectedError: false,
-			expectedCount: 5,
+			expectedCount: 5, // messages in chat 789 are unaffected
 			expectedMsg:   "Chat history for user @regular (ID: 789) has been cleared.",
 		},
 	}
 
 	for _, tc := range testCases {
 		t.Run(tc.name, func(t *testing.T) {
+			// Reset messages for the test case
 			if tc.name != "Owner hard deletes regular user's history" {
+				// Delete all messages for the target user
 				err = db.Where("user_id = ?", tc.targetUserID).Delete(&Message{}).Error
 				assert.NoError(t, err)
 
+				// Recreate messages for the target user
 				for i := 0; i < 5; i++ {
 					message := Message{
 						BotID:     b.botID,
@@ -321,16 +349,20 @@ func TestClearChatHistory(t *testing.T) {
 				}
 			}
 
+			// Setup mock response expectations
 			var sentMessage string
 			mockTgClient.SendMessageFunc = func(ctx context.Context, params *bot.SendMessageParams) (*models.Message, error) {
 				sentMessage = params.Text
 				return &models.Message{}, nil
 			}
 
+			// Call the clearChatHistory method
 			b.clearChatHistory(context.Background(), chatID, tc.currentUserID, tc.targetUserID, tc.targetChatID, tc.businessConnID, tc.hardDelete)
 
+			// Verify the response message
 			assert.Equal(t, tc.expectedMsg, sentMessage)
 
+			// Count remaining messages for the target user
 			var count int64
 			if tc.hardDelete {
 				db.Unscoped().Model(&Message{}).Where("user_id = ? AND chat_id = ?", tc.targetUserID, chatID).Count(&count)
@@ -343,6 +375,7 @@ func TestClearChatHistory(t *testing.T) {
 }
 
 func TestStatsCommand(t *testing.T) {
+	// Setup
 	db := setupTestDB(t)
 	mockClock := &MockClock{
 		currentTime: time.Now(),
@@ -350,7 +383,7 @@ func TestStatsCommand(t *testing.T) {
 
 	config := BotConfig{
 		ID:              "test_bot",
-		OwnerTelegramID: 123,
+		OwnerTelegramID: 123, // owner's ID
 		TelegramToken:   "test_token",
 		MemorySize:      10,
 		MessagePerHour:  5,
@@ -362,6 +395,7 @@ func TestStatsCommand(t *testing.T) {
 
 	mockTgClient := &MockTelegramClient{}
 
+	// Create bot model first
 	botModel := &BotModel{
 		Identifier: config.ID,
 		Name:       config.ID,
@@ -369,6 +403,7 @@ func TestStatsCommand(t *testing.T) {
 	err := db.Create(botModel).Error
 	assert.NoError(t, err)
 
+	// Create bot config
 	configModel := &ConfigModel{
 		BotID:           botModel.ID,
 		MemorySize:      config.MemorySize,
@@ -382,17 +417,21 @@ func TestStatsCommand(t *testing.T) {
 	err = db.Create(configModel).Error
 	assert.NoError(t, err)
 
+	// Create bot instance
 	b, err := NewBot(db, config, mockClock, mockTgClient)
 	assert.NoError(t, err)
 
+	// Create test users
 	ownerID := int64(123)
 	adminID := int64(456)
 	regularUserID := int64(789)
 	chatID := int64(1000)
 
+	// Create admin role
 	adminRole, err := b.getRoleByName("admin")
 	assert.NoError(t, err)
 
+	// Create admin user
 	adminUser := User{
 		BotID:      b.botID,
 		TelegramID: adminID,
@@ -404,6 +443,7 @@ func TestStatsCommand(t *testing.T) {
 	err = db.Create(&adminUser).Error
 	assert.NoError(t, err)
 
+	// Create regular user
 	regularRole, err := b.getRoleByName("user")
 	assert.NoError(t, err)
 	regularUser := User{
@@ -417,8 +457,10 @@ func TestStatsCommand(t *testing.T) {
 	err = db.Create(&regularUser).Error
 	assert.NoError(t, err)
 
+	// Create test messages for each user
 	for _, userID := range []int64{ownerID, adminID, regularUserID} {
 		for i := 0; i < 5; i++ {
+			// User message
 			userMessage := Message{
 				BotID:     b.botID,
 				ChatID:    chatID,
@@ -432,6 +474,7 @@ func TestStatsCommand(t *testing.T) {
 			err = db.Create(&userMessage).Error
 			assert.NoError(t, err)
 
+			// Bot response
 			botMessage := Message{
 				BotID:     b.botID,
 				ChatID:    chatID,
@@ -447,6 +490,7 @@ func TestStatsCommand(t *testing.T) {
 		}
 	}
 
+	// Test cases
 	testCases := []struct {
 		name           string
 		command        string
@@ -515,12 +559,14 @@ func TestStatsCommand(t *testing.T) {
 
 	for _, tc := range testCases {
 		t.Run(tc.name, func(t *testing.T) {
+			// Setup mock response expectations
 			var sentMessage string
 			mockTgClient.SendMessageFunc = func(ctx context.Context, params *bot.SendMessageParams) (*models.Message, error) {
 				sentMessage = params.Text
 				return &models.Message{}, nil
 			}
 
+			// Create update with command
 			update := &models.Update{
 				Message: &models.Message{
 					Chat: models.Chat{ID: chatID},
@@ -533,19 +579,22 @@ func TestStatsCommand(t *testing.T) {
 						{
 							Type:   "bot_command",
 							Offset: 0,
-							Length: 6,
+							Length: 6, // Length of "/stats"
 						},
 					},
 				},
 			}
 
+			// Handle the update
 			b.handleUpdate(context.Background(), nil, update)
 
+			// Verify the response message contains the expected text
 			assert.Contains(t, sentMessage, tc.expectedMsg)
 		})
 	}
 }
 
+// Helper function to get username by ID for test
 func getUsernameByID(id int64) string {
 	switch id {
 	case 123:
@@ -565,11 +614,13 @@ func setupTestDB(t *testing.T) *gorm.DB {
 		t.Fatalf("Failed to open test database: %v", err)
 	}
 
+	// AutoMigrate the models
 	err = db.AutoMigrate(&BotModel{}, &ConfigModel{}, &Message{}, &User{}, &Role{}, &Scope{})
 	if err != nil {
 		t.Fatalf("Failed to migrate database schema: %v", err)
 	}
 
+	// Create default roles and scopes
 	err = createDefaultRoles(db)
 	if err != nil {
 		t.Fatalf("Failed to create default roles: %v", err)
@@ -581,6 +632,8 @@ func setupTestDB(t *testing.T) *gorm.DB {
 	return db
 }
 
+// setupBotForTest creates a minimal Bot instance backed by an in-memory DB.
+// It follows the same pattern as the existing handler tests to avoid duplication.
 func setupBotForTest(t *testing.T, ownerID int64) (*Bot, *MockTelegramClient) {
 	t.Helper()
 	db := setupTestDB(t)
@@ -615,9 +668,13 @@ func setupBotForTest(t *testing.T, ownerID int64) (*Bot, *MockTelegramClient) {
 	return b, mockTgClient
 }
 
+// TestAnthropicErrorResponse verifies that model-deprecation errors surface actionable
+// details only to admin/owner, and that regular users and non-model errors always get
+// the generic fallback.
 func TestAnthropicErrorResponse(t *testing.T) { //NOSONAR go:S100 -- underscore separation is idiomatic in Go test names
 	b, _ := setupBotForTest(t, 123)
 
+	// Create admin user
 	adminRole, err := b.getRoleByName("admin")
 	assert.NoError(t, err)
 	assert.NoError(t, b.db.Create(&User{
@@ -625,6 +682,7 @@ func TestAnthropicErrorResponse(t *testing.T) { //NOSONAR go:S100 -- underscore
 		RoleID: adminRole.ID, Role: adminRole,
 	}).Error)
 
+	// Create regular user
 	userRole, err := b.getRoleByName("user")
 	assert.NoError(t, err)
 	assert.NoError(t, b.db.Create(&User{
@@ -662,18 +720,11 @@ func TestAnthropicErrorResponse(t *testing.T) { //NOSONAR go:S100 -- underscore
 			wantMissing: "/set_model",
 		},
 		{
-			name:        "owner receives elevated detail for non-API error",
+			name:        "owner receives generic message for non-model error",
 			err:         otherErr,
 			userID:      123,
-			wantSubstr:  "Anthropic call failed:",
-			wantMissing: "I'm sorry",
-		},
-		{
-			name:        "regular user receives generic message for non-model error",
-			err:         otherErr,
-			userID:      789,
 			wantSubstr:  "I'm sorry",
-			wantMissing: "Anthropic call failed",
+			wantMissing: "/set_model",
 		},
 	}
 
@@ -688,9 +739,12 @@ func TestAnthropicErrorResponse(t *testing.T) { //NOSONAR go:S100 -- underscore
 	}
 }
 
+// TestSetModelCommand verifies that /set_model enforces permissions, validates input,
+// updates the model in memory, and persists the change to the config file on disk.
 func TestSetModelCommand(t *testing.T) { //NOSONAR go:S100 -- underscore separation is idiomatic in Go test names
 	b, mockTgClient := setupBotForTest(t, 123)
 
+	// Point the config at a temporary file so PersistModel can write to disk.
 	tempDir, err := os.MkdirTemp("", "set_model_cmd_test")
 	assert.NoError(t, err)
 	defer func() { _ = os.RemoveAll(tempDir) }()
@@ -700,6 +754,7 @@ func TestSetModelCommand(t *testing.T) { //NOSONAR go:S100 -- underscore separat
 	assert.NoError(t, os.WriteFile(configPath, []byte(initialJSON), 0600))
 	b.config.ConfigFilePath = configPath
 
+	// Create admin and regular users
 	adminRole, err := b.getRoleByName("admin")
 	assert.NoError(t, err)
 	assert.NoError(t, b.db.Create(&User{
@@ -715,6 +770,8 @@ func TestSetModelCommand(t *testing.T) { //NOSONAR go:S100 -- underscore separat
 
 	chatID := int64(1000)
 
+	// Seed chat 1000 with a prior message so isNewChatFlag is false for all subtests.
+	// Commands are only processed in the non-new-chat branch of handleUpdate.
 	assert.NoError(t, b.db.Create(&Message{
 		BotID: b.botID, ChatID: chatID, UserID: 789, Username: "regular",
 		UserRole: "user", Text: "hello", IsUser: true,
@@ -777,6 +834,7 @@ func TestSetModelCommand(t *testing.T) { //NOSONAR go:S100 -- underscore separat
 		})
 	}
 
+	// Verify the successful update took effect in memory and on disk.
 	t.Run("model change persisted in memory and on disk", func(t *testing.T) {
 		assert.Equal(t, "claude-sonnet-4-6", string(b.config.Model))
 		data, err := os.ReadFile(configPath)
@@ -785,10 +843,12 @@ func TestSetModelCommand(t *testing.T) { //NOSONAR go:S100 -- underscore separat
 	})
 }
 
+// TestHasScope verifies that scope checks honour role assignments and the owner bypass.
 func TestHasScope(t *testing.T) { //NOSONAR go:S100 -- underscore separation is idiomatic in Go test names
 	const ownerID int64 = 100
 	b, _ := setupBotForTest(t, ownerID)
 
+	// Admin user
 	adminRole, err := b.getRoleByName("admin")
 	assert.NoError(t, err)
 	assert.NoError(t, b.db.Create(&User{
@@ -796,6 +856,7 @@ func TestHasScope(t *testing.T) { //NOSONAR go:S100 -- underscore separation is
 		RoleID: adminRole.ID, Role: adminRole,
 	}).Error)
 
+	// Regular user
 	userRole, err := b.getRoleByName("user")
 	assert.NoError(t, err)
 	assert.NoError(t, b.db.Create(&User{

logger.go

@@ -5,13 +5,23 @@ import (
 	"os"
 )
 
+// For log management, use journalctl commands:
+//   - View logs: journalctl -u telegram-bot
+//   - Follow logs: journalctl -u telegram-bot -f
+//   - View errors: journalctl -u telegram-bot -p err
+// Refer to the documentation for details on systemd unit setup.
+
+// Initialize loggers for informational and error messages.
 var (
 	InfoLogger  *log.Logger
 	ErrorLogger *log.Logger
 )
 
+// initLoggers sets up separate loggers for stdout and stderr.
 func initLoggers() {
+	// InfoLogger writes to stdout with specific flags.
 	InfoLogger = log.New(os.Stdout, "INFO: ", log.Ldate|log.Ltime|log.Lshortfile)
 
+	// ErrorLogger writes to stderr with specific flags.
 	ErrorLogger = log.New(os.Stderr, "ERROR: ", log.Ldate|log.Ltime|log.Lshortfile)
 }

main.go

@@ -8,30 +8,38 @@ import (
 )
 
 func main() {
+	// Initialize custom loggers
 	initLoggers()
 
+	// Log the start of the application
 	InfoLogger.Println("Starting Telegram Bot Application")
 
+	// Initialize database
 	db, err := initDB()
 	if err != nil {
 		ErrorLogger.Fatalf("Error initializing database: %v", err)
 	}
 
+	// Load all bot configurations
 	configs, err := loadAllConfigs("config")
 	if err != nil {
 		ErrorLogger.Fatalf("Error loading configurations: %v", err)
 	}
 
+	// Create a WaitGroup to manage goroutines
 	var wg sync.WaitGroup
 
+	// Set up context with cancellation
 	ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt)
 	defer cancel()
 
+	// Initialize and start each bot
 	for _, config := range configs {
 		wg.Add(1)
 		go func(cfg BotConfig) {
 			defer wg.Done()
 
+			// Create Bot instance without TelegramClient initially
 			realClock := RealClock{}
 			bot, err := NewBot(db, cfg, realClock, nil)
 			if err != nil {
@@ -39,14 +47,17 @@ func main() {
 				return
 			}
 
+			// Start the bot in a separate goroutine
 			go bot.Start(ctx)
 
+			// Keep the bot running until the context is cancelled
 			<-ctx.Done()
 
 			InfoLogger.Printf("Bot %s stopped", cfg.ID)
 		}(config)
 	}
 
+	// Wait for all bots to finish
 	wg.Wait()
 
 	InfoLogger.Println("All bots have stopped. Exiting application.")

models.go

@@ -8,10 +8,10 @@ import (
 
 type BotModel struct {
 	gorm.Model
-	Identifier string `gorm:"uniqueIndex"`
+	Identifier string `gorm:"uniqueIndex"` // Renamed from ID to Identifier
 	Name       string
 	Configs    []ConfigModel `gorm:"foreignKey:BotID;constraint:OnDelete:CASCADE"`
-	Users      []User        `gorm:"foreignKey:BotID;constraint:OnDelete:CASCADE"`
+	Users      []User        `gorm:"foreignKey:BotID;constraint:OnDelete:CASCADE"` // Associated users
 	Messages   []Message     `gorm:"foreignKey:BotID;constraint:OnDelete:CASCADE"`
 }
 
@@ -22,36 +22,35 @@ type ConfigModel struct {
 	MessagePerHour  int    `json:"messages_per_hour"`
 	MessagePerDay   int    `json:"messages_per_day"`
 	TempBanDuration string `json:"temp_ban_duration"`
-	SystemPrompts   string `json:"system_prompts"`
+	SystemPrompts   string `json:"system_prompts"` // Consider JSON string or separate table
 	TelegramToken   string `json:"telegram_token"`
 	Active          bool   `json:"active"`
 }
 
 type Message struct {
 	gorm.Model
-	BotID          uint   `gorm:"index"`
-	ChatID         int64  `gorm:"index"`
-	UserID         int64  `gorm:"index"`
-	Username       string `gorm:"index"`
-	UserRole       string
+	BotID          uint      `gorm:"index"`
+	ChatID         int64     `gorm:"index"`
+	UserID         int64     `gorm:"index"`
+	Username       string    `gorm:"index"`
+	UserRole       string    // Store the role as a string
 	Text           string    `gorm:"type:text"`
 	Timestamp      time.Time `gorm:"index"`
 	IsUser         bool
 	StickerFileID  string
 	StickerPNGFile string
-	StickerEmoji   string
-	DeletedAt      gorm.DeletedAt `gorm:"index"`
-	AnsweredOn     *time.Time     `gorm:"index"`
-	ImageFileIDs   []string       `gorm:"type:text;serializer:json"`
-	FilesCleanedAt *time.Time     `gorm:"index"`
+	StickerEmoji   string         // Store the emoji associated with the sticker
+	DeletedAt      gorm.DeletedAt `gorm:"index"` // Add soft delete field
+	AnsweredOn     *time.Time     `gorm:"index"` // Tracks when a user message was answered (NULL for assistant messages and unanswered user messages)
 }
 
 type ChatMemory struct {
 	Messages             []Message
 	Size                 int
-	BusinessConnectionID string
+	BusinessConnectionID string // New field to store the business connection ID
 }
 
+// Scope name constants — used in DB seeding, hasScope checks, and tests.
 const (
 	ScopeStatsViewOwn        = "stats:view:own"
 	ScopeStatsViewAny        = "stats:view:any"
@@ -61,7 +60,6 @@ const (
 	ScopeHistoryClearHardAny = "history:clear_hard:any"
 	ScopeModelSet            = "model:set"
 	ScopeUserPromote         = "user:promote"
-	ScopeTTSUse              = "tts:use"
 )
 
 type Scope struct {
@@ -77,14 +75,16 @@ type Role struct {
 
 type User struct {
 	gorm.Model
-	BotID      uint  `gorm:"uniqueIndex:idx_user_bot;index"`
-	TelegramID int64 `gorm:"uniqueIndex:idx_user_bot;not null"`
+	BotID      uint  `gorm:"uniqueIndex:idx_user_bot;index"`    // Foreign key to BotModel
+	TelegramID int64 `gorm:"uniqueIndex:idx_user_bot;not null"` // Unique per (telegram_id, bot_id) pair
 	Username   string
 	RoleID     uint
 	Role       Role `gorm:"foreignKey:RoleID"`
-	IsOwner    bool `gorm:"default:false"`
+	IsOwner    bool `gorm:"default:false"` // Indicates if the user is the owner
 }
 
+// idx_user_bot is a composite unique index on (bot_id, telegram_id),
+// allowing the same Telegram user to be registered independently on each bot.
 func (User) TableName() string {
 	return "users"
 }

rate_limiter.go

@@ -33,20 +33,26 @@ func (b *Bot) checkRateLimits(userID int64) bool {
 
 	now := limiter.clock.Now()
 
+	// Check if the user is currently banned
 	if now.Before(limiter.banUntil) {
 		return false
 	}
 
+	// Reset hourly limiter if an hour has passed since the last reset
 	if now.Sub(limiter.lastHourlyReset) >= time.Hour {
 		limiter.hourlyLimiter = rate.NewLimiter(rate.Every(time.Hour/time.Duration(b.config.MessagePerHour)), b.config.MessagePerHour)
 		limiter.lastHourlyReset = now
 	}
 
+	// Reset daily limiter if 24 hours have passed since the last reset
 	if now.Sub(limiter.lastDailyReset) >= 24*time.Hour {
 		limiter.dailyLimiter = rate.NewLimiter(rate.Every(24*time.Hour/time.Duration(b.config.MessagePerDay)), b.config.MessagePerDay)
 		limiter.lastDailyReset = now
 	}
 
+	// Check if the message exceeds rate limits.
+	// Reserve from both limiters first, then cancel both if either is over budget.
+	// This prevents consuming a token from one limiter when the other rejects.
 	dailyRes := limiter.dailyLimiter.ReserveN(now, 1)
 	hourlyRes := limiter.hourlyLimiter.ReserveN(now, 1)
 	if dailyRes.DelayFrom(now) > 0 || hourlyRes.DelayFrom(now) > 0 {
@@ -54,6 +60,7 @@ func (b *Bot) checkRateLimits(userID int64) bool {
 		hourlyRes.CancelAt(now)
 		banDuration, err := time.ParseDuration(b.config.TempBanDuration)
 		if err != nil {
+			// If parsing fails, default to a 24-hour ban
 			banDuration = 24 * time.Hour
 		}
 		limiter.banUntil = now.Add(banDuration)

rate_limiter_test.go

@@ -5,22 +5,27 @@ import (
 	"time"
 )
 
+// TestCheckRateLimits tests the checkRateLimits method of the Bot.
+// It verifies that users are allowed or denied based on their message rates.
 func TestCheckRateLimits(t *testing.T) {
+	// Create a mock clock starting at a fixed time
 	mockClock := &MockClock{
 		currentTime: time.Date(2023, 10, 1, 0, 0, 0, 0, time.UTC),
 	}
 
+	// Create a mock configuration with reduced timeframes for testing
 	config := BotConfig{
 		ID:              "bot1",
 		MemorySize:      10,
-		MessagePerHour:  5,
-		MessagePerDay:   10,
-		TempBanDuration: "1m",
+		MessagePerHour:  5,    // Allow 5 messages per hour
+		MessagePerDay:   10,   // Allow 10 messages per day
+		TempBanDuration: "1m", // Temporary ban duration of 1 minute for testing
 		SystemPrompts:   make(map[string]string),
 		TelegramToken:   "YOUR_TELEGRAM_BOT_TOKEN",
 		OwnerTelegramID: 123456789,
 	}
 
+	// Initialize the Bot with mock data and MockClock
 	bot := &Bot{
 		config:       config,
 		userLimiters: make(map[int64]*userLimiter),
@@ -29,39 +34,52 @@ func TestCheckRateLimits(t *testing.T) {
 
 	userID := int64(12345)
 
+	// Helper function to simulate message sending
 	sendMessage := func() bool {
 		return bot.checkRateLimits(userID)
 	}
 
+	// Send 5 messages within the hourly limit
 	for i := 0; i < config.MessagePerHour; i++ {
 		if !sendMessage() {
 			t.Errorf("Expected message %d to be allowed", i+1)
 		}
 	}
 
+	// 6th message should exceed the hourly limit and trigger a ban
 	if sendMessage() {
 		t.Errorf("Expected message to be denied due to hourly limit exceeded")
 	}
 
+	// Attempt to send another message immediately, should still be banned
 	if sendMessage() {
 		t.Errorf("Expected message to be denied while user is banned")
 	}
 
-	mockClock.Advance(time.Minute)
+	// Fast-forward time by TempBanDuration to lift the ban
+	mockClock.Advance(time.Minute) // Banned for 1 minute
 
-	mockClock.Advance(time.Hour)
+	// Advance time to allow hourly limiter to replenish
+	mockClock.Advance(time.Hour) // Advance by 1 hour
 
+	// Send another message, should be allowed now
 	if !sendMessage() {
 		t.Errorf("Expected message to be allowed after ban duration")
 	}
 
+	// Send additional messages to reach the daily limit
 	for i := 0; i < config.MessagePerDay-config.MessagePerHour-1; i++ {
 		if !sendMessage() {
 			t.Errorf("Expected message %d to be allowed towards daily limit", i+1)
 		}
 	}
 
+	// Attempt to exceed the daily limit
 	if sendMessage() {
 		t.Errorf("Expected message to be denied due to daily limit exceeded")
 	}
 }
+
+// To ensure thread safety and avoid race conditions during testing,
+// you can run the tests with the `-race` flag:
+// go test -race -v

telegram_client.go

@@ -1,3 +1,4 @@
+// telegram_client.go
 package main
 
 import (
@@ -7,11 +8,9 @@ import (
 	"github.com/go-telegram/bot/models"
 )
 
+// TelegramClient defines the methods required from the Telegram bot.
 type TelegramClient interface {
 	SendMessage(ctx context.Context, params *bot.SendMessageParams) (*models.Message, error)
-	SendAudio(ctx context.Context, params *bot.SendAudioParams) (*models.Message, error)
 	SetMyCommands(ctx context.Context, params *bot.SetMyCommandsParams) (bool, error)
-	GetFile(ctx context.Context, params *bot.GetFileParams) (*models.File, error)
-	FileDownloadLink(f *models.File) string
 	Start(ctx context.Context)
 }

telegram_client_mock.go

@@ -1,3 +1,4 @@
+// telegram_client_mock.go
 package main
 
 import (
@@ -8,16 +9,15 @@ import (
 	"github.com/stretchr/testify/mock"
 )
 
+// MockTelegramClient is a mock implementation of TelegramClient for testing.
 type MockTelegramClient struct {
 	mock.Mock
-	SendMessageFunc      func(ctx context.Context, params *bot.SendMessageParams) (*models.Message, error)
-	SendAudioFunc        func(ctx context.Context, params *bot.SendAudioParams) (*models.Message, error)
-	SetMyCommandsFunc    func(ctx context.Context, params *bot.SetMyCommandsParams) (bool, error)
-	GetFileFunc          func(ctx context.Context, params *bot.GetFileParams) (*models.File, error)
-	FileDownloadLinkFunc func(f *models.File) string
-	StartFunc            func(ctx context.Context)
+	SendMessageFunc   func(ctx context.Context, params *bot.SendMessageParams) (*models.Message, error)
+	SetMyCommandsFunc func(ctx context.Context, params *bot.SetMyCommandsParams) (bool, error)
+	StartFunc         func(ctx context.Context)
 }
 
+// SendMessage mocks sending a message.
 func (m *MockTelegramClient) SendMessage(ctx context.Context, params *bot.SendMessageParams) (*models.Message, error) {
 	if m.SendMessageFunc != nil {
 		return m.SendMessageFunc(ctx, params)
@@ -29,6 +29,7 @@ func (m *MockTelegramClient) SendMessage(ctx context.Context, params *bot.SendMe
 	return nil, args.Error(1)
 }
 
+// SetMyCommands mocks registering bot commands.
 func (m *MockTelegramClient) SetMyCommands(ctx context.Context, params *bot.SetMyCommandsParams) (bool, error) {
 	if m.SetMyCommandsFunc != nil {
 		return m.SetMyCommandsFunc(ctx, params)
@@ -36,27 +37,7 @@ func (m *MockTelegramClient) SetMyCommands(ctx context.Context, params *bot.SetM
 	return true, nil
 }
 
-func (m *MockTelegramClient) SendAudio(ctx context.Context, params *bot.SendAudioParams) (*models.Message, error) {
-	if m.SendAudioFunc != nil {
-		return m.SendAudioFunc(ctx, params)
-	}
-	return nil, nil
-}
-
-func (m *MockTelegramClient) GetFile(ctx context.Context, params *bot.GetFileParams) (*models.File, error) {
-	if m.GetFileFunc != nil {
-		return m.GetFileFunc(ctx, params)
-	}
-	return &models.File{}, nil
-}
-
-func (m *MockTelegramClient) FileDownloadLink(f *models.File) string {
-	if m.FileDownloadLinkFunc != nil {
-		return m.FileDownloadLinkFunc(f)
-	}
-	return ""
-}
-
+// Start mocks starting the Telegram client.
 func (m *MockTelegramClient) Start(ctx context.Context) {
 	if m.StartFunc != nil {
 		m.StartFunc(ctx)

telegram_helpers.go

@@ -1,52 +0,0 @@
-package main
-
-import (
-	"context"
-	"fmt"
-	"io"
-	"net/http"
-
-	tgbot "github.com/go-telegram/bot"
-	"github.com/go-telegram/bot/models"
-)
-
-func largestPhotoSize(photos []models.PhotoSize) models.PhotoSize {
-	if len(photos) == 0 {
-		return models.PhotoSize{}
-	}
-	largest := photos[0]
-	largestArea := largest.Width * largest.Height
-	for i := 1; i < len(photos); i++ {
-		area := photos[i].Width * photos[i].Height
-		if area > largestArea {
-			largest = photos[i]
-			largestArea = area
-		}
-	}
-	return largest
-}
-
-func (b *Bot) downloadTelegramFile(ctx context.Context, fileID string) ([]byte, error) {
-	fileInfo, err := b.tgBot.GetFile(ctx, &tgbot.GetFileParams{FileID: fileID})
-	if err != nil {
-		return nil, fmt.Errorf("telegram GetFile %s: %w", fileID, err)
-	}
-	downloadURL := b.tgBot.FileDownloadLink(fileInfo)
-	req, err := http.NewRequestWithContext(ctx, http.MethodGet, downloadURL, nil)
-	if err != nil {
-		return nil, fmt.Errorf("telegram download request %s: %w", fileID, err)
-	}
-	resp, err := http.DefaultClient.Do(req)
-	if err != nil {
-		return nil, fmt.Errorf("telegram download %s: %w", fileID, err)
-	}
-	defer func() { _ = resp.Body.Close() }()
-	if resp.StatusCode != http.StatusOK {
-		return nil, fmt.Errorf("telegram download %s: status %d", fileID, resp.StatusCode)
-	}
-	data, err := io.ReadAll(resp.Body)
-	if err != nil {
-		return nil, fmt.Errorf("telegram download read %s: %w", fileID, err)
-	}
-	return data, nil
-}

telegram_helpers_test.go

@@ -1,53 +0,0 @@
-package main
-
-import (
-	"testing"
-
-	"github.com/go-telegram/bot/models"
-	"github.com/stretchr/testify/assert"
-)
-
-func TestLargestPhotoSize(t *testing.T) {
-	cases := []struct {
-		name       string
-		photos     []models.PhotoSize
-		wantFileID string
-	}{
-		{
-			name: "ascending sizes — last is largest",
-			photos: []models.PhotoSize{
-				{FileID: "thumb", Width: 90, Height: 90},
-				{FileID: "small", Width: 320, Height: 320},
-				{FileID: "full", Width: 1280, Height: 720},
-			},
-			wantFileID: "full",
-		},
-		{
-			name: "descending sizes — first is largest",
-			photos: []models.PhotoSize{
-				{FileID: "full", Width: 1280, Height: 720},
-				{FileID: "small", Width: 320, Height: 320},
-				{FileID: "thumb", Width: 90, Height: 90},
-			},
-			wantFileID: "full",
-		},
-		{
-			name: "single photo",
-			photos: []models.PhotoSize{
-				{FileID: "solo", Width: 800, Height: 600},
-			},
-			wantFileID: "solo",
-		},
-		{
-			name:       "empty slice returns zero value (caller guards upstream)",
-			photos:     []models.PhotoSize{},
-			wantFileID: "",
-		},
-	}
-	for _, tc := range cases {
-		t.Run(tc.name, func(t *testing.T) {
-			got := largestPhotoSize(tc.photos)
-			assert.Equal(t, tc.wantFileID, got.FileID)
-		})
-	}
-}

user_management_test.go

@@ -22,18 +22,22 @@ const (
 )
 
 func TestOwnerAssignment(t *testing.T) {
+	// Initialize loggers
 	initLoggers()
 
+	// Initialize in-memory database for testing
 	db, err := gorm.Open(sqlite.Open(memoryDSN), &gorm.Config{})
 	if err != nil {
 		t.Fatalf(errOpenDB, err)
 	}
 
+	// Migrate the schema
 	err = db.AutoMigrate(&BotModel{}, &ConfigModel{}, &Message{}, &User{}, &Role{}, &Scope{})
 	if err != nil {
 		t.Fatalf(errMigrateSchema, err)
 	}
 
+	// Create default roles and scopes
 	err = createDefaultRoles(db)
 	if err != nil {
 		t.Fatalf(errCreateRoles, err)
@@ -42,6 +46,7 @@ func TestOwnerAssignment(t *testing.T) {
 		t.Fatalf(errCreateScopes, err)
 	}
 
+	// Create a bot configuration
 	config := BotConfig{
 		ID:              "test_bot",
 		TelegramToken:   "TEST_TELEGRAM_TOKEN",
@@ -54,41 +59,49 @@ func TestOwnerAssignment(t *testing.T) {
 		OwnerTelegramID: 111111111,
 	}
 
+	// Initialize MockClock
 	mockClock := &MockClock{
 		currentTime: time.Now(),
 	}
 
+	// Initialize MockTelegramClient
 	mockTGClient := &MockTelegramClient{
 		SendMessageFunc: func(ctx context.Context, params *bot.SendMessageParams) (*models.Message, error) {
 			chatID, ok := params.ChatID.(int64)
 			if !ok {
 				return nil, fmt.Errorf("ChatID is not of type int64")
 			}
+			// Simulate successful message sending
 			return &models.Message{ID: 1, Chat: models.Chat{ID: chatID}}, nil
 		},
 	}
 
+	// Create the bot with the mock Telegram client
 	bot, err := NewBot(db, config, mockClock, mockTGClient)
 	if err != nil {
 		t.Fatalf(errCreateBot, err)
 	}
 
+	// Verify that the owner exists
 	var owner User
 	err = db.Where("telegram_id = ? AND bot_id = ? AND is_owner = ?", config.OwnerTelegramID, bot.botID, true).First(&owner).Error
 	if err != nil {
 		t.Fatalf("Owner was not created: %v", err)
 	}
 
+	// Attempt to create another owner for the same bot
 	_, err = bot.getOrCreateUser(222222222, "AnotherOwner", true)
 	if err == nil {
 		t.Fatalf("Expected error when creating a second owner, but got none")
 	}
 
+	// Verify that the error message is appropriate
 	expectedErrorMsg := "an owner already exists for this bot"
 	if err.Error() != expectedErrorMsg {
 		t.Fatalf("Unexpected error message: %v", err)
 	}
 
+	// Assign admin role to a new user
 	regularUser, err := bot.getOrCreateUser(333333333, "RegularUser", false)
 	if err != nil {
 		t.Fatalf("Failed to create regular user: %v", err)
@@ -98,6 +111,7 @@ func TestOwnerAssignment(t *testing.T) {
 		t.Fatalf("Expected role 'user', got '%s'", regularUser.Role.Name)
 	}
 
+	// Attempt to change an existing user to owner
 	_, err = bot.getOrCreateUser(333333333, "AdminUser", true)
 	if err == nil {
 		t.Fatalf("Expected error when changing existing user to owner, but got none")
@@ -108,21 +122,27 @@ func TestOwnerAssignment(t *testing.T) {
 		t.Fatalf("Unexpected error message: %v", err)
 	}
 
+	// If you need to test admin creation, you should do it through a separate admin creation function
+	// or by updating an existing user's role with proper authorization checks
 }
 
 func TestPromoteUserToAdmin(t *testing.T) {
+	// Initialize loggers
 	initLoggers()
 
+	// Initialize in-memory database for testing
 	db, err := gorm.Open(sqlite.Open(memoryDSN), &gorm.Config{})
 	if err != nil {
 		t.Fatalf(errOpenDB, err)
 	}
 
+	// Migrate the schema
 	err = db.AutoMigrate(&BotModel{}, &ConfigModel{}, &Message{}, &User{}, &Role{}, &Scope{})
 	if err != nil {
 		t.Fatalf(errMigrateSchema, err)
 	}
 
+	// Create default roles and scopes
 	err = createDefaultRoles(db)
 	if err != nil {
 		t.Fatalf(errCreateRoles, err)
@@ -151,11 +171,13 @@ func TestPromoteUserToAdmin(t *testing.T) {
 		t.Fatalf(errCreateBot, err)
 	}
 
+	// Create an owner
 	owner, err := bot.getOrCreateUser(config.OwnerTelegramID, "OwnerUser", true)
 	if err != nil {
 		t.Fatalf("Failed to create owner: %v", err)
 	}
 
+	// Test promoting a user to admin
 	regularUser, err := bot.getOrCreateUser(444444444, "RegularUser", false)
 	if err != nil {
 		t.Fatalf("Failed to create regular user: %v", err)
@@ -166,6 +188,7 @@ func TestPromoteUserToAdmin(t *testing.T) {
 		t.Fatalf("Failed to promote user to admin: %v", err)
 	}
 
+	// Refresh user data
 	promotedUser, err := bot.getOrCreateUser(444444444, "RegularUser", false)
 	if err != nil {
 		t.Fatalf("Failed to get promoted user: %v", err)
@@ -176,19 +199,26 @@ func TestPromoteUserToAdmin(t *testing.T) {
 	}
 }
 
+// TestGetOrCreateUser tests the getOrCreateUser method of the Bot.
+// It verifies that a new user is created when one does not exist,
+// and an existing user is returned when one does exist.
 func TestGetOrCreateUser(t *testing.T) {
+	// Initialize loggers
 	initLoggers()
 
+	// Initialize in-memory database for testing
 	db, err := gorm.Open(sqlite.Open(memoryDSN), &gorm.Config{})
 	if err != nil {
 		t.Fatalf(errOpenDB, err)
 	}
 
+	// Migrate the schema
 	err = db.AutoMigrate(&BotModel{}, &ConfigModel{}, &Message{}, &User{}, &Role{}, &Scope{})
 	if err != nil {
 		t.Fatalf(errMigrateSchema, err)
 	}
 
+	// Create default roles and scopes
 	err = createDefaultRoles(db)
 	if err != nil {
 		t.Fatalf(errCreateRoles, err)
@@ -197,10 +227,12 @@ func TestGetOrCreateUser(t *testing.T) {
 		t.Fatalf(errCreateScopes, err)
 	}
 
+	// Create a mock clock starting at a fixed time
 	mockClock := &MockClock{
 		currentTime: time.Date(2023, 10, 1, 0, 0, 0, 0, time.UTC),
 	}
 
+	// Create a mock configuration
 	config := BotConfig{
 		ID:              "bot1",
 		MemorySize:      10,
@@ -212,49 +244,62 @@ func TestGetOrCreateUser(t *testing.T) {
 		OwnerTelegramID: 123456789,
 	}
 
+	// Initialize MockTelegramClient
 	mockTGClient := &MockTelegramClient{
 		SendMessageFunc: func(ctx context.Context, params *bot.SendMessageParams) (*models.Message, error) {
 			chatID, ok := params.ChatID.(int64)
 			if !ok {
 				return nil, fmt.Errorf("ChatID is not of type int64")
 			}
+			// Simulate successful message sending
 			return &models.Message{ID: 1, Chat: models.Chat{ID: chatID}}, nil
 		},
 	}
 
+	// Create the bot with the mock Telegram client
 	bot, err := NewBot(db, config, mockClock, mockTGClient)
 	if err != nil {
 		t.Fatalf(errCreateBot, err)
 	}
 
+	// Verify that the owner exists
 	var owner User
 	err = db.Where("telegram_id = ? AND bot_id = ? AND is_owner = ?", config.OwnerTelegramID, bot.botID, true).First(&owner).Error
 	if err != nil {
 		t.Fatalf("Owner was not created: %v", err)
 	}
 
+	// Attempt to create another owner for the same bot
 	_, err = bot.getOrCreateUser(222222222, "AnotherOwner", true)
 	if err == nil {
 		t.Fatalf("Expected error when creating a second owner, but got none")
 	}
 
+	// Create a new user
 	newUser, err := bot.getOrCreateUser(987654321, "TestUser", false)
 	if err != nil {
 		t.Fatalf("Failed to create a new user: %v", err)
 	}
 
+	// Verify that the new user was created
 	var userInDB User
 	err = db.Where("telegram_id = ?", newUser.TelegramID).First(&userInDB).Error
 	if err != nil {
 		t.Fatalf("New user was not created in the database: %v", err)
 	}
 
+	// Get the existing user
 	existingUser, err := bot.getOrCreateUser(987654321, "TestUser", false)
 	if err != nil {
 		t.Fatalf("Failed to get existing user: %v", err)
 	}
 
+	// Verify that the existing user is the same as the new user
 	if existingUser.ID != userInDB.ID {
 		t.Fatalf("Expected to get the existing user, but got a different user")
 	}
 }
+
+// To ensure thread safety and avoid race conditions during testing,
+// you can run the tests with the `-race` flag:
+// go test -race -v