import { Workbox } from "workbox-window";

export default defineNuxtPlugin(() => {
    const updateAvailable = ref(false);
    let wb: Workbox | null = null;

    if ("serviceWorker" in navigator) {
        wb = new Workbox("/sw.js");

        // Listen for messages from the service worker
        navigator.serviceWorker.addEventListener("message", (event) => {
            if (event.data && event.data.type === "VERSION_CHECK") {
                checkForUpdate(event.data.version);
            }
        });

        // Register the service worker and check if there's already a waiting one
        wb.register().then((registration: any) => {
            if (registration.waiting) {
                checkForUpdate();
            }
        });
    }

    // 🔹 Function to compare versions and show update modal if needed
    const checkForUpdate = (newVersion?: string) => {
        const currentVersion = localStorage.getItem("pwa_version");

        if (newVersion && currentVersion !== newVersion) {
            updateAvailable.value = true;
            localStorage.setItem("pwa_version", newVersion);
        }
    };

    // 🔹 Function to apply the update
    const handleUpdate = () => {
        wb?.messageSW({ type: "SKIP_WAITING" });
        window.location.reload();
    };

    return {
        provide: {
            updateAvailable,
            handleUpdate,
        },
    };
});