import { useState, useEffect, useCallback } from 'react';
import { api, ApiError } from '@/lib/api';

interface AuthState {
  isAuthenticated: boolean;
  username: string | null;
  isLoading: boolean;
}

export function useAuth() {
  const [state, setState] = useState<AuthState>({
    isAuthenticated: false,
    username: null,
    isLoading: true,
  });

  const checkSession = useCallback(async () => {
    try {
      const data = await api.me();
      setState({ isAuthenticated: true, username: data.username, isLoading: false });
    } catch {
      setState({ isAuthenticated: false, username: null, isLoading: false });
    }
  }, []);

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

  const login = async (username: string, password: string) => {
    try {
      await api.login(username, password);
      setState({ isAuthenticated: true, username, isLoading: false });
      return true;
    } catch (err) {
      if (err instanceof ApiError) throw err;
      throw new Error('Login failed');
    }
  };

  const logout = async () => {
    await api.logout();
    setState({ isAuthenticated: false, username: null, isLoading: false });
  };

  return { ...state, login, logout, checkSession };
}