import { createContext, useCallback, useContext, useMemo, useState } from 'react';

const AuthContext = createContext(null);

export function AuthProvider({ children }) {
  const [user, setUser] = useState(null);

  const signIn = useCallback(async (token, profile) => {
    setUser({ token, profile });
  }, []);

  const signOut = useCallback(() => {
    setUser(null);
  }, []);

  const value = useMemo(() => ({ user, signIn, signOut }), [user, signIn, signOut]);

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

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