const CACHE_NAME = 'emailbill-v1';
const urlsToCache = [
  '/',
  '/index.html',
  '/favicon.ico',
  '/manifest.json'
];

// 安装 Service Worker
self.addEventListener('install', (event) => {
  console.log('[Service Worker] 安装中...');
  event.waitUntil(
    caches.open(CACHE_NAME)
      .then((cache) => {
        console.log('[Service Worker] 缓存文件');
        return cache.addAll(urlsToCache);
      })
      .then(() => self.skipWaiting())
  );
});

// 激活 Service Worker
self.addEventListener('activate', (event) => {
  console.log('[Service Worker] 激活中...');
  event.waitUntil(
    caches.keys().then((cacheNames) => {
      return Promise.all(
        cacheNames.map((cacheName) => {
          if (cacheName !== CACHE_NAME) {
            console.log('[Service Worker] 删除旧缓存:', cacheName);
            return caches.delete(cacheName);
          }
        })
      );
    }).then(() => self.clients.claim())
  );
});

// 拦截请求
self.addEventListener('fetch', (event) => {
  const { request } = event;
  const url = new URL(request.url);

  // 跳过跨域请求
  if (url.origin !== location.origin) {
    return;
  }

  // API请求使用网络优先策略
  if (url.pathname.startsWith('/api/')) {
    event.respondWith(
      fetch(request)
        .then((response) => {
          // 克隆响应以便缓存
          const responseClone = response.clone();
          caches.open(CACHE_NAME).then((cache) => {
            cache.put(request, responseClone);
          });
          return response;
        })
        .catch(() => {
          // 网络失败时尝试从缓存获取
          return caches.match(request);
        })
    );
    return;
  }

  // 静态资源使用缓存优先策略
  event.respondWith(
    caches.match(request)
      .then((response) => {
        if (response) {
          return response;
        }
        return fetch(request).then((response) => {
          // 检查是否是有效响应
          if (!response || response.status !== 200 || response.type !== 'basic') {
            return response;
          }

          const responseClone = response.clone();
          caches.open(CACHE_NAME).then((cache) => {
            cache.put(request, responseClone);
          });

          return response;
        });
      })
      .catch(() => {
        // 返回离线页面或默认内容
        if (request.destination === 'document') {
          return caches.match('/index.html');
        }
      })
  );
});

// 后台同步
self.addEventListener('sync', (event) => {
  console.log('[Service Worker] 后台同步:', event.tag);
  if (event.tag === 'sync-data') {
    event.waitUntil(syncData());
  }
});

// 推送通知
self.addEventListener('push', (event) => {
  console.log('[Service Worker] 收到推送消息');
  const options = {
    body: event.data ? event.data.text() : '您有新的账单消息',
    icon: '/icons/icon-192x192.png',
    badge: '/icons/icon-72x72.png',
    vibrate: [200, 100, 200],
    tag: 'emailbill-notification',
    requireInteraction: false
  };

  event.waitUntil(
    self.registration.showNotification('账单管理', options)
  );
});

// 通知点击
self.addEventListener('notificationclick', (event) => {
  console.log('[Service Worker] 通知被点击');
  event.notification.close();
  event.waitUntil(
    clients.openWindow('/')
  );
});

// 数据同步函数
async function syncData() {
  try {
    // 这里添加需要同步的逻辑
    console.log('[Service Worker] 执行数据同步');
  } catch (error) {
    console.error('[Service Worker] 同步失败:', error);
  }
}