import React, { createContext, useContext, useEffect, useState, ReactNode } from 'react';
import { useLocalStorage } from '../hooks/useLocalStorage';

type Theme = 'light' | 'dark';

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

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

export const ThemeProvider: React.FC<{ children: ReactNode }> = ({ children }) => {
    const [theme, setTheme] = useLocalStorage<Theme>('theme', 'light');

    useEffect(() => {
        const root = window.document.documentElement;
        if (theme === 'dark') {
            root.classList.add('dark');
        } else {
            root.classList.remove('dark');
        }
    }, [theme]);

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

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

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