/// <reference lib="webworker" />
/* eslint-disable no-restricted-globals */

// This service worker can be customized!
// See https://developers.google.com/web/tools/workbox/modules
// for the list of available Workbox modules, or add any other
// code you'd like.
// You can also remove this file if you'd prefer not to use a
// service worker, and the Workbox build step will be skipped.

import { clientsClaim } from "workbox-core";
import { ExpirationPlugin } from "workbox-expiration";
import { CacheableResponsePlugin } from "workbox-cacheable-response";
import { precacheAndRoute, createHandlerBoundToURL } from "workbox-precaching";
import { registerRoute } from "workbox-routing";
import { StaleWhileRevalidate, CacheFirst, NetworkFirst } from "workbox-strategies";

declare const self: ServiceWorkerGlobalScope;

clientsClaim();

// Precache all of the assets generated by your build process.
// Their URLs are injected into the manifest variable below.
// This variable must be present somewhere in your service worker file,
// even if you decide not to use precaching. See https://cra.link/PWA
precacheAndRoute(self.__WB_MANIFEST);

// Set up App Shell-style routing, so that all navigation requests
// are fulfilled with your index.html shell. Learn more at
// https://developers.google.com/web/fundamentals/architecture/app-shell
const fileExtensionRegexp = new RegExp("/[^/?]+\\.[^/]+$");
registerRoute(
    // Return false to exempt requests from being fulfilled by index.html.
    ({ request, url }: { request: Request; url: URL }) => {
        // If this isn't a navigation, skip.
        if (request.mode !== "navigate") {
            return false;
        }

        // If this is a URL that starts with /_, skip.
        if (url.pathname.startsWith("/_")) {
            return false;
        }

        // If this looks like a URL for a resource, because it contains
        // a file extension, skip.
        if (url.pathname.match(fileExtensionRegexp)) {
            return false;
        }

        // Return true to signal that we want to use the handler.
        return true;
    },
    createHandlerBoundToURL(process.env.PUBLIC_URL + "/index.html")
);

// An example runtime caching route for requests that aren't handled by the
// precache, in this case same-origin .png requests like those from in public/
registerRoute(
    // Add in any other file extensions or routing criteria as needed.
    ({ url }) =>
        url.origin === self.location.origin && url.pathname.startsWith("/static"),
    // Customize this strategy as needed, e.g., by changing to CacheFirst.
    new StaleWhileRevalidate({
        cacheName: "app-static",
        plugins: [
            // Ensure that once this runtime cache reaches a maximum size the
            // least-recently used files are removed.
            new ExpirationPlugin({ maxEntries: 100 }),
        ],
    })
);

registerRoute(
    ({ url }) =>
        [
            "cdn.jsdeliv.net",
            "cdnjs.cloudflare.com",
            "static.cloudflareinsights.com",
            process.env.REACT_APP_IMAGES_API_URL || "i.metahkg.org",
            "na.cx",
            "gstatic.com",
            "google.com",
            "sa.metahkg.org",
        ].some((i) => url.origin.includes(i)),
    new CacheFirst({
        cacheName: "app-external-assets",
        plugins: [
            new CacheableResponsePlugin({
                statuses: [0, 200],
            }),
            new ExpirationPlugin({ maxAgeSeconds: 60 * 24 * 60 }),
        ],
    })
);

registerRoute(
    ({ url }) => url.pathname.startsWith("/api"),
    new NetworkFirst({
        cacheName: "app-api",
        plugins: [
            new CacheableResponsePlugin({
                statuses: [200],
            }),
            new ExpirationPlugin({ maxAgeSeconds: 60 * 24 * 30 }),
        ],
    })
);

// This allows the web app to trigger skipWaiting via
// registration.waiting.postMessage({type: 'SKIP_WAITING'})
self.addEventListener("message", (event) => {
    if (event.data && event.data.type === "SKIP_WAITING") {
        self.skipWaiting();
    }
    if (event.data && event.data.type === "CHECK_VERSION") {
        const build = process.env.REACT_APP_build || "1";
        self.clients.matchAll({ includeUncontrolled: true, type: "window" }).then((all) =>
            all.map((client) =>
                client.postMessage({
                    type: "CURRENT_VERSION",
                    payload: `build ${build}`,
                })
            )
        );
    }
});

// Any other custom service worker logic can go here.