"use client";

import { useState, useEffect } from 'react';

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

  // Initialize theme on component mount
  useEffect(() => {
    const isDarkMode = localStorage.getItem('darkMode') === 'true';
    setDarkMode(isDarkMode);
    
    if (isDarkMode) {
      document.documentElement.classList.add('dark');
    } else {
      document.documentElement.classList.remove('dark');
    }
  }, []);

  // Update theme when darkMode state changes
  const toggleTheme = () => {
    const newDarkMode = !darkMode;
    setDarkMode(newDarkMode);
    localStorage.setItem('darkMode', newDarkMode.toString());
    
    if (newDarkMode) {
      document.documentElement.classList.add('dark');
    } else {
      document.documentElement.classList.remove('dark');
    }
  };

  return (
    <button
      onClick={toggleTheme}
      className="p-2 rounded-md bg-card-bg border border-card-border hover:bg-card-bg/80 transition-colors"
      aria-label={darkMode ? "Switch to light mode" : "Switch to dark mode"}
    >
      {darkMode ? (
        <svg
          className="w-5 h-5 text-accent-yellow"
          fill="currentColor"
          viewBox="0 0 20 20"
          xmlns="http://www.w3.org/2000/svg"
        >
          <path
            fillRule="evenodd"
            d="M10 2a1 1 0 011 1v1a1 1 0 11-2 0V3a1 1 0 011-1zm4 8a4 4 0 11-8 0 4 4 0 018 0zm-.464 4.95l.707.707a1 1 0 001.414-1.414l-.707-.707a1 1 0 00-1.414 1.414zm2.12-10.607a1 1 0 010 1.414l-.706.707a1 1 0 11-1.414-1.414l.707-.707a1 1 0 011.414 0zM17 11a1 1 0 100-2h-1a1 1 0 100 2h1zm-7 4a1 1 0 011 1v1a1 1 0 11-2 0v-1a1 1 0 011-1zM5.05 6.464A1 1 0 106.465 5.05l-.708-.707a1 1 0 00-1.414 1.414l.707.707zm1.414 8.486l-.707.707a1 1 0 01-1.414-1.414l.707-.707a1 1 0 011.414 1.414zM4 11a1 1 0 100-2H3a1 1 0 000 2h1z"
            clipRule="evenodd"
          />
        </svg>
      ) : (
        <svg
          className="w-5 h-5 text-foreground"
          fill="currentColor"
          viewBox="0 0 20 20"
          xmlns="http://www.w3.org/2000/svg"
        >
          <path d="M17.293 13.293A8 8 0 016.707 2.707a8.001 8.001 0 1010.586 10.586z" />
        </svg>
      )}
    </button>
  );
}