import { useEffect } from 'react';
import { useNavigate, useLocation } from 'react-router-dom';
import { useAuth } from '@/contexts/AuthContext';

// 不需要登录的公共页面路径
const PUBLIC_PATHS = [
  '/login',
  '/register',
  '/forgot-password',
  '/reset-password',
  '/404',
  '/500'
];

/**
 * 认证守卫Hook
 * 用于在组件中检查用户是否已登录
 * @param requireAuth 是否需要认证，默认为true
 * @param redirectTo 未认证时重定向的路径，默认为'/login'
 */
export function useAuthGuard(requireAuth: boolean = true, redirectTo: string = '/login') {
  const { isAuthenticated, isLoading } = useAuth();
  const navigate = useNavigate();
  const location = useLocation();

  // 检查当前路径是否是公共页面
  const isPublicPath = PUBLIC_PATHS.some(path => 
    location.pathname.startsWith(path)
  );

  useEffect(() => {
    // 如果正在加载，不进行任何跳转
    if (isLoading) {
      return;
    }

    // 如果需要认证但未登录且不是公共页面
    if (requireAuth && !isAuthenticated && !isPublicPath) {
      // 保存当前URL，登录后可以重定向回来
      const returnUrl = encodeURIComponent(window.location.href);
      navigate(`${redirectTo}?returnUrl=${returnUrl}`, { replace: true });
      return;
    }

    // 如果已登录但在登录页面，重定向到首页
    if (isAuthenticated && location.pathname === '/login') {
      navigate('/', { replace: true });
      return;
    }
  }, [isAuthenticated, isLoading, location.pathname, navigate, requireAuth, redirectTo, isPublicPath]);

  return {
    isAuthenticated,
    isLoading,
    isPublicPath,
    // 是否应该显示内容
    shouldRender: !isLoading && (isAuthenticated || isPublicPath || !requireAuth)
  };
}

/**
 * 简单的认证检查Hook
 * 只返回认证状态，不进行自动重定向
 */
export function useAuthCheck() {
  const { isAuthenticated, isLoading } = useAuth();
  const location = useLocation();

  const isPublicPath = PUBLIC_PATHS.some(path => 
    location.pathname.startsWith(path)
  );

  return {
    isAuthenticated,
    isLoading,
    isPublicPath,
    // 是否需要认证
    requiresAuth: !isPublicPath
  };
}