"use client";

import React, { createContext, useContext, useEffect, useState } from 'react';

type Theme = 'dark' | 'light';

interface ThemeContextType {
  theme: Theme;
  toggleTheme: () => void;
  setTheme: (theme: Theme) => void;
}

const ThemeContext = createContext<ThemeContextType>({
  theme: 'dark',
  toggleTheme: () => {},
  setTheme: () => {},
});

export function useTheme() {
  return useContext(ThemeContext);
}

export function ThemeProvider({ children }: { children: React.ReactNode }) {
  const [theme, setThemeState] = useState<Theme>('dark');
  const [mounted, setMounted] = useState(false);

  useEffect(() => {
    const stored = localStorage.getItem('theme') as Theme | null;
    const initial = stored || 'dark';
    setThemeState(initial);
    document.documentElement.classList.toggle('dark', initial === 'dark');
    setMounted(true);
  }, []);

  const setTheme = (t: Theme) => {
    setThemeState(t);
    localStorage.setItem('theme', t);
    document.documentElement.classList.toggle('dark', t === 'dark');
  };

  const toggleTheme = () => {
    setTheme(theme === 'dark' ? 'light' : 'dark');
  };

  if (!mounted) {
    return <>{children}</>;
  }

  return (
    <ThemeContext.Provider value={{ theme, toggleTheme, setTheme }}>
      {children}
    </ThemeContext.Provider>
  );
}