'use client';

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

type Theme = 'light' | 'dark';

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

const ThemeContext = createContext<ThemeContextType | null>(null);

export function ThemeProvider({ children }: { children: ReactNode }) {
  const [theme, setTheme] = useState<Theme>('light');

  useEffect(() => {
    // Intentar cargar el tema guardado
    const savedTheme = localStorage.getItem('theme') as Theme | null;
    
    if (savedTheme && (savedTheme === 'light' || savedTheme === 'dark')) {
      setTheme(savedTheme);
    } else {
      // Si no hay tema guardado, usar preferencia del sistema
      const prefersDark = window.matchMedia('(prefers-color-scheme: dark)').matches;
      setTheme(prefersDark ? 'dark' : 'light');
    }
  }, []);

  useEffect(() => {
    // Aplicar la clase al document.documentElement cuando cambie el tema
    if (theme === 'dark') {
      document.documentElement.classList.add('dark');
    } else {
      document.documentElement.classList.remove('dark');
    }
    
    // Guardar tema en localStorage
    localStorage.setItem('theme', theme);
  }, [theme]);

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

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

export function useTheme() {
  const context = useContext(ThemeContext);
  if (!context) {
    throw new Error('useTheme must be used within a ThemeProvider');
  }
  return context;
}