// sw.js - Service Worker 示例
const CACHE_NAME = 'my-site-cache-v1';
const urlsToCache = [
    '/',
    '/index.html',
    '/styles.css',
    '/script.js'
];

// 安装事件
self.addEventListener('install', event => {
    console.log('[SW] 安装中...');
    event.waitUntil(
        caches.open(CACHE_NAME)
            .then(cache => cache.addAll(urlsToCache))
            .then(() => self.skipWaiting())
    );
});

// 激活事件
self.addEventListener('activate', event => {
    console.log('[SW] 激活中...');
    event.waitUntil(
        caches.keys().then(keys =>
            Promise.all(keys.filter(k => k !== CACHE_NAME)
                .map(k => caches.delete(k)))
        ).then(() => self.clients.claim())
    );
});

// 拦截请求
self.addEventListener('fetch', event => {
    event.respondWith(
        caches.match(event.request)
            .then(resp => resp || fetch(event.request))
    );
});

// 接收消息
self.addEventListener('message', event => {
    console.log('[SW] 收到消息:', event.data);
    if (event.data.action === 'ping') {
        event.ports[0]?.postMessage({ action: 'pong', time: Date.now() });
    }
    if (event.ports[0]) {
        event.ports[0].postMessage({
            echo: event.data,
            swVersion: '1.0.0',
            timestamp: Date.now()
        });
    }
});