'use client';

import { useState, useEffect } from 'react';

export function useDarkMode() {
  const [darkMode, setDarkMode] = useState(false);

  useEffect(() => {
    // Check if user has a dark mode preference in localStorage
    const isDark = localStorage.getItem('darkMode') === 'true';
    // Check system preference if no localStorage value
    const systemPrefersDark = window.matchMedia('(prefers-color-scheme: dark)').matches;
    
    setDarkMode(isDark ?? systemPrefersDark);

    // Add listener for system theme changes
    const mediaQuery = window.matchMedia('(prefers-color-scheme: dark)');
    const handleChange = (e: MediaQueryListEvent) => {
      if (localStorage.getItem('darkMode') === null) {
        setDarkMode(e.matches);
      }
    };

    mediaQuery.addEventListener('change', handleChange);
    return () => mediaQuery.removeEventListener('change', handleChange);
  }, []);

  const toggleDarkMode = () => {
    setDarkMode(!darkMode);
    localStorage.setItem('darkMode', (!darkMode).toString());
  };

  return { darkMode, toggleDarkMode };
}