import { Workbox } from "workbox-window";

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

    // Enhanced PWA detection
    const isStandalone = window.matchMedia(
        "(display-mode: standalone)"
    ).matches;
    const isIOSPWA = (window.navigator as any).standalone;
    const isInstalledAsPWA = isStandalone || isIOSPWA;

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

        // Listen for version checks from SW
        wb.addEventListener("message", (event) => {
            if (event.data.type === "VERSION_CHECK") {
                checkForUpdate(event.data.version);
            }
        });

        // Register service worker
        wb.register().then((registration: any) => {
            if (registration.waiting) {
                checkForUpdate();
            }
        });

        // Detect controller changes for updates
        wb.addEventListener("controlling", () => {
            window.location.reload();
        });
    }

    const checkForUpdate = (newVersion?: string) => {
        const currentVersion = localStorage.getItem("pwa_version");

        if (!newVersion) {
            // If no version provided, just trigger update
            updateAvailable.value = true;
            return;
        }

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

    const handleUpdate = () => {
        if (!!wb) {
            wb.messageSW({ type: "SKIP_WAITING" });
        }
    };

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