import { createContext, useContext, useState, useEffect } from 'react';
import api from '../api/axios';
import { useNavigate } from 'react-router-dom';

const AuthContext = createContext(null);

export const AuthProvider = ({ children }) => {
    const [user, setUser] = useState(null);
    const [loading, setLoading] = useState(true);

    const navigate = useNavigate();

    useEffect(() => {
        checkUser();
    }, []);

    const checkUser = async () => {
        const token = localStorage.getItem('access_token');
        if (token) {
            try {
                const response = await api.get('auth/profile/');
                setUser(response.data);
            } catch (error) {
                // Token might be invalid or expired (and refresh failed)
                localStorage.removeItem('access_token');
                localStorage.removeItem('refresh_token');
                setUser(null);
            }
        }
        setLoading(false);
    };

    const login = async (username, password) => {
        const response = await api.post('auth/login/', { username, password });
        localStorage.setItem('access_token', response.data.access);
        localStorage.setItem('refresh_token', response.data.refresh);
        await checkUser();
        navigate('/dashboard');
    };

    const register = async (username, email, password) => {
        const response = await api.post('auth/register/', { username, email, password });
        // Auto-login with the tokens returned from registration
        localStorage.setItem('access_token', response.data.access);
        localStorage.setItem('refresh_token', response.data.refresh);
        setUser(response.data.user);
        navigate('/dashboard');
    };

    const logout = () => {
        localStorage.removeItem('access_token');
        localStorage.removeItem('refresh_token');
        setUser(null);
        navigate('/');
    };

    return (
        <AuthContext.Provider value={{ user, login, register, logout, loading }}>
            {!loading && children}
        </AuthContext.Provider>
    );
};

export const useAuth = () => useContext(AuthContext);