(function () {
    var STORAGE_DISMISS = 'geonet-console-pwa-install-dismissed';
    var STORAGE_INSTALLED = 'geonet-console-pwa-installed';
    var DISMISS_DAYS = 7;
    var deferredPrompt = null;

    function isStandalone() {
        return window.matchMedia('(display-mode: standalone)').matches
            || window.navigator.standalone === true;
    }

    function isIos() {
        return /iphone|ipad|ipod/i.test(navigator.userAgent);
    }

    function isDismissed() {
        try {
            var raw = localStorage.getItem(STORAGE_DISMISS);
            if (!raw) {
                return false;
            }
            var dismissedAt = parseInt(raw, 10);
            if (isNaN(dismissedAt)) {
                return false;
            }
            return (Date.now() - dismissedAt) < (DISMISS_DAYS * 24 * 60 * 60 * 1000);
        } catch (e) {
            return false;
        }
    }

    function markDismissed() {
        try {
            localStorage.setItem(STORAGE_DISMISS, String(Date.now()));
        } catch (e) {}
        hideBanner();
    }

    function markInstalled() {
        try {
            localStorage.setItem(STORAGE_INSTALLED, '1');
        } catch (e) {}
        hideBanner();
    }

    function hideBanner() {
        var banner = document.getElementById('pwa-install-banner');
        if (banner) {
            banner.hidden = true;
            banner.setAttribute('aria-hidden', 'true');
        }
    }

    function showBanner(mode) {
        if (isStandalone() || isDismissed()) {
            return;
        }

        var banner = document.getElementById('pwa-install-banner');
        if (!banner) {
            return;
        }

        var chromeRow = banner.querySelector('[data-pwa-install-chrome]');
        var iosRow = banner.querySelector('[data-pwa-install-ios]');

        if (mode === 'ios') {
            if (chromeRow) chromeRow.hidden = true;
            if (iosRow) iosRow.hidden = false;
        } else {
            if (chromeRow) chromeRow.hidden = false;
            if (iosRow) iosRow.hidden = true;
        }

        banner.hidden = false;
        banner.setAttribute('aria-hidden', 'false');
    }

    function bindActions() {
        var banner = document.getElementById('pwa-install-banner');
        if (!banner) {
            return;
        }

        var installBtn = banner.querySelector('[data-pwa-install-action]');
        var dismissBtn = banner.querySelector('[data-pwa-install-dismiss]');

        if (installBtn) {
            installBtn.addEventListener('click', function () {
                if (deferredPrompt) {
                    deferredPrompt.prompt();
                    deferredPrompt.userChoice.then(function (choice) {
                        if (choice.outcome === 'accepted') {
                            markInstalled();
                        }
                        deferredPrompt = null;
                    });
                    return;
                }

                if (isIos()) {
                    showBanner('ios');
                }
            });
        }

        if (dismissBtn) {
            dismissBtn.addEventListener('click', markDismissed);
        }
    }

    window.addEventListener('beforeinstallprompt', function (event) {
        event.preventDefault();
        deferredPrompt = event;
        showBanner('chrome');
    });

    window.addEventListener('appinstalled', markInstalled);

    document.addEventListener('DOMContentLoaded', function () {
        bindActions();

        if (isStandalone()) {
            hideBanner();
            return;
        }

        if (isIos() && !isDismissed()) {
            window.setTimeout(function () {
                showBanner('ios');
            }, 1500);
            return;
        }

        if (!deferredPrompt && !isDismissed()) {
            window.setTimeout(function () {
                if (!deferredPrompt && !isIos()) {
                    return;
                }
            }, 2000);
        }
    });
})();