(function() {
    // 1. 載入外部廣告與追蹤腳本
    var scripts = [
        "https://securepubads.g.doubleclick.net/tag/js/gpt.js",
        "https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-6327508837875273",
        "https://www.googletagmanager.com/gtag/js?id=G-NYKJF5H5T3",
        "https://www.googletagmanager.com/gtag/js?id=UA-222890203-3"
    ];

    scripts.forEach(function(src) {
        var s = document.createElement("script");
        s.src = src;
        s.async = true;
        document.head.appendChild(s);
    });

    // GA 初始化
    window.dataLayer = window.dataLayer || [];
    function gtag(){dataLayer.push(arguments);}
    gtag('js', new Date());
    gtag('config', 'G-NYKJF5H5T3');
    gtag('config', 'UA-222890203-3');

    // Punwave Mapping
    var mapping = document.createElement('iframe');
    mapping.src = 'https://server.punwave.com/a/mapping/foodnext_cht_mapping.html';
    mapping.width = "1";
    mapping.height = "1";
    mapping.style.display = "none";
    document.body.appendChild(mapping);

    // 2. 廣告容器插入工具 (針對 sb_2 增加 min-height 以提升可視率)
    function adupdate(adunit, adcode) {
        var elements = document.getElementsByClassName(adunit);
        if (elements.length > 0) {
            elements[0].insertAdjacentHTML('afterEnd', adcode);
        }
    }

    adupdate('foodnext_all_hp_1', '<div id="div-gpt-ad-1646809005819-0" style="width:300px;height:250px;margin:auto;text-align:center;"></div>');
    adupdate('foodnext_all_hp_2', '<div id="div-gpt-ad-1646809030691-0" style="width:300px;height:250px;"></div>');
    adupdate('foodnext_all_sb_2', '<div id="div-gpt-ad-1659696645761-0" style="width:250px;height:250px;"></div><div id="div-gpt-ad-1724050069235-0"></div>');
    // 影音版位容器：加上 min-height 確保可見性計算正確
    adupdate('QA-post mb15', '<div id="div-gpt-ad-1646808878332-0" style="margin-left: 15px;margin-right: 15px;text-align:center;min-height:250px;"></div>');
    adupdate('foodnext_all_tv_ir_1', '<div id="div-gpt-ad-1646808987044-0" style="width:300px;height:250px;margin:auto;text-align:center;"></div>');
    adupdate('foodnext_mobile_bottom', '<style>.ad-fixed-bottom {overflow:auto; margin: 0 auto; position: fixed; z-index:99; left:0px; bottom:5px; width: 100%;text-align:center;} @media (min-width: 768px) {.ad-fixed-bottom {display: none;}}</style><div class="ad-fixed-bottom"><div id="div-gpt-ad-1646808855263-0" style="margin:auto;"></div></div>');

    // 3. 判定環境與路徑
    var isMobile = /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent);
    var path = window.location.pathname;
    var isHome = (path === '/' || path === '/index.html');
    var isTV = path.includes('/tv');

    // 4. Google Tag 廣告定義
    window.googletag = window.googletag || {cmd: []};
    googletag.cmd.push(function() {
        var videoSlot = null; // 影音版位物件暫存

        // 設定 Targeting
        googletag.pubads().setTargeting('website', location.hostname);
        googletag.pubads().setTargeting('url', path);

        if (isMobile) {
            googletag.defineSlot('/22675675822/foodnext_mobile_bottom', [320, 50], 'div-gpt-ad-1646808855263-0').addService(googletag.pubads());
            if (isHome) {
                googletag.defineSlot('/22675675822/foodnext_all_hp_1', [[300, 250], [336, 280]], 'div-gpt-ad-1646809005819-0').addService(googletag.pubads());
                googletag.defineSlot('/22675675822/foodnext_all_hp_2', [300, 250], 'div-gpt-ad-1646809030691-0').addService(googletag.pubads());
            } else {
                // 移動版 sb_2 (賦予 videoSlot)
                videoSlot = googletag.defineSlot('/22675675822/foodnext_all_sb_2', [[336, 280], [468, 60], [1, 1], [300, 250], [728, 90]], 'div-gpt-ad-1646808878332-0').addService(googletag.pubads());
                if (isTV) {
                    googletag.defineSlot('/22675675822/foodnext_all_tv_ir_1', [[336, 280], [300, 250]], 'div-gpt-ad-1646808987044-0').addService(googletag.pubads());
                }
            }
        } else {
            if (isHome) {
                googletag.defineSlot('/22675675822/foodnext_all_hp_1', [[300, 250], [336, 280]], 'div-gpt-ad-1646809005819-0').addService(googletag.pubads());
                googletag.defineSlot('/22675675822/foodnext_all_hp_2', [[336, 280], [300, 250]], 'div-gpt-ad-1646809030691-0').addService(googletag.pubads());
            } else {
                googletag.defineSlot('/22675675822/foodnext_all_sb_3', [[250, 250], [300, 250]], 'div-gpt-ad-1659696645761-0').addService(googletag.pubads());
                googletag.defineSlot('/21727358763/BT_a_O_1', [1, 1], 'div-gpt-ad-1724050069235-0').addService(googletag.pubads());
                // 桌機版 sb_2 (賦予 videoSlot)
                videoSlot = googletag.defineSlot('/22675675822/foodnext_all_sb_2', [[336, 280], [468, 60], [1, 1], [300, 250], [728, 90]], 'div-gpt-ad-1646808878332-0').addService(googletag.pubads());
                if (isTV) {
                    googletag.defineSlot('/22675675822/foodnext_all_tv_ir_1', [[336, 280], [300, 250]], 'div-gpt-ad-1646808987044-0').addService(googletag.pubads());
                }
            }
        }

        // 全域配置：啟用 SRA 並縮小 Lazy Load 範圍以提升可視率
        googletag.pubads().enableSingleRequest();
        googletag.pubads().enableLazyLoad({
            fetchMarginPercent: 50,  // 原 100 降至 50，提升普通版位可視率
            renderMarginPercent: 20, // 原 50 降至 20
            mobileScaling: 1.5
        });

        googletag.enableServices();

        // 【核心修改】影音版位一入站就強制執行 display 與 refresh，無視 Lazy Load 距離
        if (videoSlot) {
            googletag.display('div-gpt-ad-1646808878332-0');
            googletag.pubads().refresh([videoSlot]);
        }
    });

    // 5. 統一處理剩餘版位的顯示 (延遲 500ms)
    setTimeout(function() {
        googletag.cmd.push(function() {
            var ads = document.querySelectorAll('div[id^="div-gpt-ad-"]');
            ads.forEach(function(ad) {
                // 排除剛才已經手動觸發過的影音版位 ID
                if (ad.id !== 'div-gpt-ad-1646808878332-0') {
                    googletag.display(ad.id);
                }
            });
        });
    }, 500);

})();