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

interface AuthContextType {
    isAuthenticated: boolean;
    login: (password: string) => Promise<boolean>;
    logout: () => void;
}

const AuthContext = createContext<AuthContextType | null>(null);

export const AuthProvider: React.FC<{ children: React.ReactNode }> = ({ children }) => {
    const [isAuthenticated, setIsAuthenticated] = useState(false);
    const [isLoading, setIsLoading] = useState(true);

    useEffect(() => {
        const token = sessionStorage.getItem('eventqr_token');
        if (token) {
            setIsAuthenticated(true);
        }
        setIsLoading(false);
    }, []);

    const login = async (password: string) => {
        try {
            const response = await fetch('/api/login', {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify({ password }),
            });

            if (response.ok) {
                const data = await response.json();
                if (data.accessToken) {
                    sessionStorage.setItem('eventqr_token', data.accessToken);
                    setIsAuthenticated(true);
                    return true;
                }
            }
            return false;
        } catch (error) {
            console.error('Login failed:', error);
            return false;
        }
    };

    const logout = () => {
        sessionStorage.removeItem('eventqr_token');
        setIsAuthenticated(false);
        fetch('/api/logout', { method: 'POST' });
    };

    if (isLoading) {
        return null;
    }

    return (
        <AuthContext.Provider value={{ isAuthenticated, login, logout }}>
            {children}
        </AuthContext.Provider>
    );
};

export const useAuth = () => {
    const context = useContext(AuthContext);
    if (!context) {
        throw new Error('useAuth must be used within an AuthProvider');
    }
    return context;
};