/// <reference types="@sveltejs/kit" />
/// <reference no-default-lib="true"/>
/// <reference lib="esnext" />
/// <reference lib="webworker" />

import { build, files, version } from '$service-worker';
import { database } from './lib/Database/IDB/user';
import {
  isNotificationQueued,
  notifications,
  updateLastNotificationID
} from './lib/Data/AniList/notifications';

const sw = self as unknown as ServiceWorkerGlobalScope;
const CACHE = `cache-${version}`;
const ASSETS = [...build, ...files];

sw.addEventListener('install', (event: ExtendableEvent) => {
  event.waitUntil(
    (async () => {
      const cache = await caches.open(CACHE);
      await cache.addAll(ASSETS);
    })()
  );
});

sw.addEventListener('activate', (event) => {
  event.waitUntil(
    (async () => {
      for (const key of await caches.keys()) {
        if (key !== CACHE) await caches.delete(key);
      }
    })()
  );
});

sw.addEventListener('fetch', (event) => {
  if (event.request.method !== 'GET') return;

  const url = new URL(event.request.url).origin;

  if (url.startsWith('chrome-extension') || url.includes('extension') || url.indexOf('http') !== 0)
    return;

  async function respond() {
    const url = new URL(event.request.url);
    const cache = await caches.open(CACHE);

    if (ASSETS.includes(url.pathname)) {
      const response = await cache.match(url.pathname);

      if (response) return response;
    }

    try {
      const response = await fetch(event.request);

      if (!(response instanceof Response)) throw new Error('invalid response from fetch');

      if (response.status === 200) cache.put(event.request, response.clone());

      return response;
    } catch (error) {
      const response = await cache.match(event.request);

      if (response) return response;

      throw error;
    }
  }

  event.respondWith(respond());
});

sw.addEventListener('push', async (event: PushEvent) => {
  event.waitUntil(
    (async () => {
      if (self.Notification && self.Notification.permission !== 'granted') return;

      try {
        const user = (await database.users.toArray()).at(0);

        if (!user) return;

        const recentNotifications = await notifications(user.user.accessToken);

        if (
          recentNotifications &&
          isNotificationQueued(recentNotifications, user.lastNotificationID)
        ) {
          await updateLastNotificationID(user.id, recentNotifications);
          await sw.registration.showNotification('due.moe', {
            body: `${recentNotifications[0].user.name}${recentNotifications[0].context}`,
            icon: recentNotifications[0].user.avatar.large || '/favicon-196x196.png',
            // https://stackoverflow.com/a/50805868/14452787
            tag: 'notification-1'
          });

          return;
        }
      } catch (error) {
        console.error(error);
      }

      if (
        navigator.userAgent.includes('Chrome') &&
        !(await sw.clients.matchAll({ type: 'window', includeUncontrolled: true })).some(
          (client) => client.visibilityState === 'visible'
        )
      ) {
        await sw.registration.showNotification('due.moe', {
          body: 'No new notifications',
          icon: '/favicon-196x196.png',
          tag: 'notification-1'
        });

        // https://github.com/firebase/quickstart-js/issues/126#issuecomment-504081087
        await new Promise((resolve) => {
          (resolve as unknown as () => void)();
          setTimeout(
            async () =>
              await sw.registration
                .getNotifications()
                .then((notifications) =>
                  notifications.forEach((notification) => notification.close())
                ),
            10
          );
        });
      }
    })()
  );
});

sw.addEventListener('notificationclick', (event: NotificationEvent) => {
  event.notification.close();
  event.waitUntil(sw.clients.openWindow('https://anilist.co/notifications'));
});