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const CACHE = "kodaira-parks-v1";
const APP_SHELL = [
  "/kodaira-data/parks/",
  "/manifest.webmanifest",
  "/icons/icon-192.png",
  "/icons/icon-512.png",
];

self.addEventListener("install", (event) => {
  event.waitUntil(
    caches
      .open(CACHE)
      .then((cache) => cache.addAll(APP_SHELL))
      .then(() => self.skipWaiting()),
  );
});

self.addEventListener("activate", (event) => {
  event.waitUntil(
    caches
      .keys()
      .then((keys) =>
        Promise.all(keys.filter((key) => key !== CACHE).map((key) => caches.delete(key))),
      )
      .then(() => self.clients.claim()),
  );
});

self.addEventListener("fetch", (event) => {
  const request = event.request;
  if (request.method !== "GET") return;

  const url = new URL(request.url);
  // OSMのタイルなど外部オリジンのものはキャッシュしない。
  if (url.origin !== self.location.origin) return;

  // ページ遷移はネットワーク優先。オフライン時はキャッシュ→公園ページ。
  if (request.mode === "navigate") {
    event.respondWith(
      fetch(request)
        .then((response) => {
          const copy = response.clone();
          caches.open(CACHE).then((cache) => cache.put(request, copy));
          return response;
        })
        .catch(() =>
          caches
            .match(request)
            .then((cached) => cached || caches.match("/kodaira-data/parks/")),
        ),
    );
    return;
  }

  // それ以外はキャッシュ優先。取得できたらキャッシュを更新する。
  event.respondWith(
    caches.match(request).then((cached) => {
      const network = fetch(request)
        .then((response) => {
          if (response.ok) {
            const copy = response.clone();
            caches.open(CACHE).then((cache) => cache.put(request, copy));
          }
          return response;
        })
        .catch(() => cached);
      return cached || network;
    }),
  );
});