/* Copyright (c) 2025-2026 马建军. All rights reserved.
 * 专有软件 — 未经授权禁止复制、传播、转售。
 * 详见 LICENSE.zh-CN.txt
 */
(function () {
    var deferredPrompt = null;
    var installBtn = document.getElementById('pwa-install-btn');
    var iosHint = document.getElementById('pwa-ios-hint');

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

    function isIOS() {
        return /iPad|iPhone|iPod/.test(navigator.userAgent)
            && !window.MSStream;
    }

    function isTouchDevice() {
        return window.matchMedia('(hover: none) and (pointer: coarse)').matches
            || window.matchMedia('(max-width: 1024px)').matches;
    }

    function updateThemeColor() {
        var meta = document.getElementById('meta-theme-color');
        if (!meta) return;
        var theme = document.documentElement.getAttribute('data-theme');
        meta.setAttribute('content', theme === 'light' ? '#e8eef8' : '#050508');
    }

    function showInstallBtn() {
        if (installBtn && !isStandalone()) {
            installBtn.hidden = false;
        }
    }

    function showIosHint() {
        if (iosHint && isIOS() && !isStandalone()) {
            iosHint.classList.add('show');
        }
    }

    if ('serviceWorker' in navigator) {
        window.addEventListener('load', function () {
            navigator.serviceWorker.register('/sw.js', { scope: '/' }).catch(function () { /* ignore */ });
        });
    }

    window.addEventListener('beforeinstallprompt', function (e) {
        e.preventDefault();
        deferredPrompt = e;
        showInstallBtn();
    });

    if (installBtn) {
        installBtn.addEventListener('click', function () {
            if (!deferredPrompt) {
                if (isIOS()) showIosHint();
                return;
            }
            deferredPrompt.prompt();
            deferredPrompt.userChoice.then(function () {
                deferredPrompt = null;
                installBtn.hidden = true;
            });
        });
    }

    window.addEventListener('appinstalled', function () {
        deferredPrompt = null;
        if (installBtn) installBtn.hidden = true;
        if (iosHint) iosHint.classList.remove('show');
    });

    document.addEventListener('DOMContentLoaded', function () {
        updateThemeColor();
        showIosHint();
        if (isStandalone()) {
            if (installBtn) installBtn.hidden = true;
            if (iosHint) iosHint.classList.remove('show');
            return;
        }
        if (isTouchDevice() && installBtn && deferredPrompt) {
            showInstallBtn();
        }
    });

    document.addEventListener('click', function (e) {
        var pick = e.target.closest('[data-theme-pick]');
        if (pick) setTimeout(updateThemeColor, 80);
    });
})();