sw.js

// Cache-first service worker. Bump CACHE on every release.

const CACHE = "workoutnotes-v1";
const SHELL = [
  ".",
  "index.html",
  "manifest.json",
  "styles.css",
  "js/db.js",
  "js/bridge.js",
  "js/bootstrap.js",
  "py/app.py",
  "py/models.py",
  "py/parser.py",
  "py/storage.py",
  "py/templates.py",
  "py/views/__init__.py",
  "py/views/common.py",
  "py/views/home.py",
  "py/views/new_workout.py",
  "py/views/exercise.py",
  "py/views/picker.py",
  "py/views/workout.py",
  "py/views/history.py",
  "py/views/paste.py",
  "py/views/settings.py",
  "icons/icon.svg",
];

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

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

self.addEventListener("fetch", (event) => {
  const url = new URL(event.request.url);
  // Cache-first for everything we can serve offline.
  // Pyodide CDN files are cached opportunistically once they succeed.
  event.respondWith(
    caches.match(event.request).then((hit) => {
      if (hit) return hit;
      return fetch(event.request).then((resp) => {
        if (!resp || resp.status !== 200) return resp;
        const isSameOrigin = url.origin === self.location.origin;
        const isPyodide = url.hostname === "cdn.jsdelivr.net";
        if (isSameOrigin || isPyodide) {
          const copy = resp.clone();
          caches.open(CACHE).then((c) => c.put(event.request, copy)).catch(() => {});
        }
        return resp;
      }).catch(() => caches.match("index.html"));
    })
  );
});