// Version identifier for cache busting
const SW_VERSION = "1.0.2";
console.log(`Firebase Messaging SW Version ${SW_VERSION} starting...`);

// Import Firebase scripts
try {
  importScripts(
    "https://www.gstatic.com/firebasejs/9.22.0/firebase-app-compat.js",
  );
  importScripts(
    "https://www.gstatic.com/firebasejs/9.22.0/firebase-messaging-compat.js",
  );
  console.log("Firebase scripts loaded successfully");
} catch (e) {
  console.error("Error loading Firebase scripts:", e);
}

// Firebase configuration - this must match exactly with your main app configuration
const firebaseConfig = {
  apiKey: "AIzaSyAYgYXsf4-iwSDEEBcNAJ3YJxz76C3STsU",
  authDomain: "student-management-syste-2e040.firebaseapp.com",
  projectId: "student-management-syste-2e040",
  storageBucket: "student-management-syste-2e040.firebasestorage.app",
  messagingSenderId: "800148418884",
  appId: "1:800148418884:web:144b9c85bfeeec12252711",
  measurementId: "G-BNRM6QEJQV",
};

// Handle any errors during initialization
try {
  // Initialize Firebase
  firebase.initializeApp(firebaseConfig);
  console.log("Firebase initialized in service worker");

  const messaging = firebase.messaging();
  console.log("Firebase messaging initialized");

  // Handle background messages
  messaging.onBackgroundMessage(function (payload) {
    console.log("Received background message:", payload);

    // Generate a unique ID for this notification
    const notificationId =
      payload.data?.notificationId || `notification-${Date.now()}`;

    // Check if we already have a notification with this ID
    return self.registration
      .getNotifications({ tag: notificationId })
      .then(function (notifications) {
        // Only show if no matching notification exists
        if (notifications.length === 0) {
          const notificationTitle =
            payload.notification?.title || "New Notification";
          const notificationOptions = {
            body: payload.notification?.body || "You have a new message.",
            icon: "/static/img/logo.png",
            badge: "/static/img/logo.png",
            tag: notificationId, // Tag helps prevent duplicates
            data: payload.data || {},
          };

          return self.registration.showNotification(
            notificationTitle,
            notificationOptions,
          );
        } else {
          console.log(
            "Prevented duplicate background notification",
            notificationId,
          );
          return Promise.resolve();
        }
      });
  });
} catch (error) {
  console.error("Firebase messaging initialization error:", error);
}

// Improve service worker lifecycle for better compatibility
self.addEventListener("install", function (event) {
  console.log("Service Worker installed");
  self.skipWaiting();
});

self.addEventListener("activate", function (event) {
  console.log("Service Worker activated");
  event.waitUntil(self.clients.claim());
});

// Add special handling for push events
self.addEventListener("push", function (event) {
  console.log("Push event received in service worker", event);

  if (!event.data) {
    console.log("Push event has no data");
    return;
  }

  try {
    const payload = event.data.json();
    console.log("Push data:", payload);

    // Generate a unique ID for this notification
    const notificationId = payload.data?.notificationId || `push-${Date.now()}`;

    event.waitUntil(
      // Check for existing notifications first
      self.registration
        .getNotifications({ tag: notificationId })
        .then(function (notifications) {
          // Only show if no matching notification exists
          if (notifications.length === 0) {
            const title = payload.notification?.title || "New Notification";
            const options = {
              body: payload.notification?.body || "You have a new message",
              icon: "/static/img/logo.png",
              badge: "/static/img/logo.png",
              tag: notificationId, // Add tag to identify this notification
              data: payload.data || {},
            };

            return self.registration.showNotification(title, options);
          } else {
            console.log(
              "Prevented duplicate push notification",
              notificationId,
            );
            return Promise.resolve();
          }
        }),
    );
  } catch (error) {
    console.error("Error handling push event:", error);
  }
});

// Improve notification click handling for various environments
self.addEventListener("notificationclick", function (event) {
  console.log("Notification clicked:", event.notification);
  event.notification.close();

  const urlToOpen = event.notification.data?.url || "/app/dashboard/";

  event.waitUntil(
    clients
      .matchAll({ type: "window", includeUncontrolled: true })
      .then((windowClients) => {
        // Check if there is already a window open with the target URL
        for (let i = 0; i < windowClients.length; i++) {
          const client = windowClients[i];
          // If so, focus on that window
          if (client.url === urlToOpen && "focus" in client) {
            return client.focus();
          }
        }
        // If not, open a new window
        if (clients.openWindow) {
          return clients.openWindow(urlToOpen);
        }
      }),
  );
});