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

interface User {
  id: string;
  email: string;
  name: string;
}

interface AuthContextType {
  user: User | null;
  isAuthenticated: boolean;
  isLoading: boolean;
  login: (email: string, password: string) => Promise<boolean>;
  logout: () => void;
}

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;
};

export const AuthProvider: React.FC<{ children: React.ReactNode }> = ({ children }) => {
  const [user, setUser] = useState<User | null>(null);
  const [isLoading, setIsLoading] = useState(true);

  // Vérifier si l'utilisateur est déjà connecté au chargement
  useEffect(() => {
    const savedUser = localStorage.getItem('xpeditis_user');
    if (savedUser) {
      try {
        setUser(JSON.parse(savedUser));
      } catch (error) {
        localStorage.removeItem('xpeditis_user');
      }
    }
    setIsLoading(false);
  }, []);

  const login = async (email: string, password: string): Promise<boolean> => {
    // Simulation d'authentification
    if (email === 'demo@xpeditis.com' && password === 'demo123') {
      const userData: User = {
        id: '1',
        email: 'demo@xpeditis.com',
        name: 'Utilisateur Demo'
      };
      
      setUser(userData);
      localStorage.setItem('xpeditis_user', JSON.stringify(userData));
      return true;
    }
    return false;
  };

  const logout = () => {
    setUser(null);
    localStorage.removeItem('xpeditis_user');
  };

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

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