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

interface User {
  id: number;
  email: string;
  username: string;
  full_name?: string;
}

interface AuthContextType {
  user: User | null;
  token: string | null;
  login: (token: string, user: User) => void;
  logout: () => void;
  isAuthenticated: boolean;
}

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

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

interface AuthProviderProps {
  children: ReactNode;
}

export const AuthProvider: React.FC<AuthProviderProps> = ({ children }) => {
  const [user, setUser] = useState<User | null>(null);
  const [token, setToken] = useState<string | null>(null);

  useEffect(() => {
    // Check for stored token on app load
    const storedToken = localStorage.getItem('tcg_vault_token');
    const storedUser = localStorage.getItem('tcg_vault_user');
    
    if (storedToken && storedUser) {
      setToken(storedToken);
      setUser(JSON.parse(storedUser));
    }
  }, []);

  const login = (newToken: string, newUser: User) => {
    setToken(newToken);
    setUser(newUser);
    localStorage.setItem('tcg_vault_token', newToken);
    localStorage.setItem('tcg_vault_user', JSON.stringify(newUser));
  };

  const logout = () => {
    setToken(null);
    setUser(null);
    localStorage.removeItem('tcg_vault_token');
    localStorage.removeItem('tcg_vault_user');
  };

  const value = {
    user,
    token,
    login,
    logout,
    isAuthenticated: !!token,
  };

  return <AuthContext.Provider value={value}>{children}</AuthContext.Provider>;
};