// public/service-worker.js
/**
 * Service Worker for Browser Notifications
 * 主要功能：支持浏览器通知的稳定运行
 */

const CACHE_NAME = 'valuefrontier-v1';

// Service Worker 安装事件
self.addEventListener('install', (event) => {
    console.log('[Service Worker] Installing...');
    // 跳过等待，立即激活
    self.skipWaiting();
});

// Service Worker 激活事件
self.addEventListener('activate', (event) => {
    console.log('[Service Worker] Activating...');
    // 立即接管所有页面
    event.waitUntil(self.clients.claim());
});

// 通知点击事件
self.addEventListener('notificationclick', (event) => {
    console.log('[Service Worker] Notification clicked:', event.notification.tag);

    event.notification.close();

    // 获取通知数据中的链接
    const urlToOpen = event.notification.data?.link;

    if (urlToOpen) {
        event.waitUntil(
            clients.matchAll({ type: 'window', includeUncontrolled: true })
                .then((windowClients) => {
                    // 查找是否已有打开的窗口
                    for (let client of windowClients) {
                        if (client.url.includes(window.location.origin) && 'focus' in client) {
                            // 聚焦现有窗口并导航到目标页面
                            return client.focus().then(client => {
                                return client.navigate(urlToOpen);
                            });
                        }
                    }
                    // 如果没有打开的窗口，打开新窗口
                    if (clients.openWindow) {
                        return clients.openWindow(urlToOpen);
                    }
                })
        );
    }
});

// 通知关闭事件
self.addEventListener('notificationclose', (event) => {
    console.log('[Service Worker] Notification closed:', event.notification.tag);
});

// Fetch 事件 - 基础的网络优先策略
self.addEventListener('fetch', (event) => {
    // 只处理同源请求，跳过跨域请求
    if (!event.request.url.startsWith(self.location.origin)) {
        return;
    }

    // 只处理 GET 请求
    if (event.request.method !== 'GET') {
        return;
    }

    // 对于通知相关的资源，使用网络优先策略
    event.respondWith(
        fetch(event.request)
            .catch(() => {
                // 网络失败时，尝试从缓存获取
                return caches.match(event.request)
                    .then(response => {
                        // 如果缓存也没有，返回一个基本的网络错误响应
                        if (!response) {
                            return new Response('Network error', {
                                status: 408,
                                statusText: 'Request Timeout',
                                headers: new Headers({
                                    'Content-Type': 'text/plain'
                                })
                            });
                        }
                        return response;
                    });
            })
    );
});

// 推送消息事件（预留，用于未来的 Push API 集成）
self.addEventListener('push', (event) => {
    console.log('[Service Worker] Push message received:', event);

    if (event.data) {
        const data = event.data.json();
        const options = {
            body: data.body || '您有新消息',
            icon: data.icon || '/favicon.png',
            badge: '/favicon.png',
            data: data.data || {},
            requireInteraction: data.requireInteraction || false,
            tag: data.tag || `notification_${Date.now()}`,
        };

        event.waitUntil(
            self.registration.showNotification(data.title || '价值前沿', options)
        );
    }
});

console.log('[Service Worker] Loaded successfully');