const STATIC_CACHE_NAME = "vitrown-static-v2";
const DYNAMIC_CACHE_NAME = "vitrown-dynamic-v2";

const STATIC_ASSETS = [
  "/",
  "/resources/manifest.webmanifest",
  "/favicon.ico",
  "/icon-192x192.png",
  "/icon-512x512.png",
  "/apple-touch-icon.png",
];

// Install event - cache static assets
self.addEventListener("install", (event) => {
  event.waitUntil(
    caches.open(STATIC_CACHE_NAME).then((cache) => {
      return cache.addAll(STATIC_ASSETS);
    })
  );
  self.skipWaiting();
});

// Activate event - clean up old caches
self.addEventListener("activate", (event) => {
  event.waitUntil(
    caches.keys().then((cacheNames) => {
      return Promise.all(
        cacheNames
          .filter((cacheName) => {
            return (
              cacheName.startsWith("vitrown-") &&
              cacheName !== STATIC_CACHE_NAME &&
              cacheName !== DYNAMIC_CACHE_NAME
            );
          })
          .map((cacheName) => caches.delete(cacheName))
      );
    })
  );
  self.clients.claim();
});

// Fetch event - network first, cache fallback strategy
self.addEventListener("fetch", (event) => {
  const { request } = event;
  const url = new URL(request.url);

  // Skip non-GET requests
  if (request.method !== "GET") {
    return;
  }

  // Skip non-HTTP(S) requests (chrome-extension://, etc.)
  if (!url.protocol.startsWith("http")) {
    return;
  }

  // Skip WebSocket, SSE, and API requests
  if (
    url.pathname.startsWith("/api/") ||
    url.protocol === "ws:" ||
    url.protocol === "wss:" ||
    request.headers.get("accept")?.includes("text/event-stream")
  ) {
    return;
  }

  // For navigation requests, try network first
  if (request.mode === "navigate") {
    event.respondWith(
      fetch(request)
        .then((response) => {
          const responseToCache = response.clone();
          caches.open(DYNAMIC_CACHE_NAME).then((cache) => {
            cache.put(request, responseToCache);
          });
          return response;
        })
        .catch(() => {
          return caches.match(request);
        })
    );
    return;
  }

  // For static assets (CSS, JS, images), use cache first
  if (
    request.destination === "style" ||
    request.destination === "script" ||
    request.destination === "image" ||
    request.destination === "font"
  ) {
    event.respondWith(
      caches.match(request).then((cachedResponse) => {
        if (cachedResponse) {
          // Update cache in background
          fetch(request).then((response) => {
            if (response.status === 200) {
              const responseToCache = response.clone();
              caches.open(STATIC_CACHE_NAME).then((cache) => {
                cache.put(request, responseToCache);
              });
            }
          });
          return cachedResponse;
        }
        return fetch(request).then((response) => {
          if (response.status === 200) {
            const responseToCache = response.clone();
            caches.open(STATIC_CACHE_NAME).then((cache) => {
              cache.put(request, responseToCache);
            });
          }
          return response;
        });
      })
    );
    return;
  }

  // For other requests, network first
  event.respondWith(
    fetch(request)
      .then((response) => {
        if (response.status === 200) {
          const responseToCache = response.clone();
          caches.open(DYNAMIC_CACHE_NAME).then((cache) => {
            cache.put(request, responseToCache);
          });
        }
        return response;
      })
      .catch(() => {
        return caches.match(request);
      })
  );
});

// Listen for messages from the client
self.addEventListener("message", (event) => {
  if (event.data && event.data.type === "SKIP_WAITING") {
    self.skipWaiting();
  }
});

// ---- Web Push ----
// Show a notification when a push arrives. Payload is JSON:
// { title, body, url, tag, notification_id }
self.addEventListener("push", (event) => {
  let data = {};
  try {
    data = event.data ? event.data.json() : {};
  } catch (e) {
    data = { title: "ویترون", body: event.data ? event.data.text() : "" };
  }

  const title = data.title || "ویترون";
  const options = {
    body: data.body || "",
    icon: "/icon-192x192.png",
    badge: "/icon-96x96.png",
    dir: "rtl",
    lang: "fa",
    tag: data.tag || "vitrown",
    renotify: true,
    data: { url: data.url || "/", notificationId: data.notification_id },
  };

  event.waitUntil(self.registration.showNotification(title, options));
});

// Focus an existing tab (or open a new one) on the target URL when clicked.
self.addEventListener("notificationclick", (event) => {
  event.notification.close();
  const targetUrl = (event.notification.data && event.notification.data.url) || "/";

  event.waitUntil(
    clients
      .matchAll({ type: "window", includeUncontrolled: true })
      .then((clientList) => {
        for (const client of clientList) {
          // If a tab is already open, navigate it and focus.
          if ("focus" in client) {
            client.focus();
            if ("navigate" in client) {
              client.navigate(targetUrl).catch(() => {});
            }
            return;
          }
        }
        if (clients.openWindow) {
          return clients.openWindow(targetUrl);
        }
      })
  );
});