/* common.js —— 全站通用交互
 * 功能：昼/夜主题切换、实时时钟、随机名言刷新、四大板块 hover 浮层、
 *      搜索栏（引擎下拉/清除/回车搜索）、复制到剪贴板、DOM 工具函数
 */
(function (global) {
    'use strict';

    /* ---------- 工具 ---------- */
    function $(sel, root) { return (root || document).querySelector(sel); }
    function $$(sel, root) { return Array.prototype.slice.call((root || document).querySelectorAll(sel)); }

    /* ---------- 主题（昼/夜） ---------- */
    var THEME_KEY = 'hp-theme';

    function currentTheme() {
        var saved = null;
        try { saved = localStorage.getItem(THEME_KEY); } catch (e) { /* ignore */ }
        if (saved === 'light' || saved === 'dark') return saved;
        // 未设置：跟随系统
        return (window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches) ? 'dark' : 'light';
    }

    function applyTheme(t, persist) {
        document.documentElement.setAttribute('data-theme', t);
        if (persist) {
            try { localStorage.setItem(THEME_KEY, t); } catch (e) { /* ignore */ }
        }
        var icons = $$('.js-theme-icon');
        icons.forEach(function (el) { el.textContent = (t === 'dark') ? '☀' : '☾'; });
        var btn = $('.js-theme-btn');
        if (btn) btn.title = (t === 'dark') ? '切换到白天模式' : '切换到黑夜模式';
    }

    function initTheme() {
        applyTheme(currentTheme(), false);
        $$('.js-theme-btn').forEach(function (btn) {
            btn.addEventListener('click', function () {
                var next = (document.documentElement.getAttribute('data-theme') === 'dark') ? 'light' : 'dark';
                applyTheme(next, true);
            });
        });
        if (window.matchMedia) {
            window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', function () {
                // 用户手动选过则不跟随系统变化
                try {
                    if (!localStorage.getItem(THEME_KEY)) applyTheme(currentTheme(), false);
                } catch (e) { applyTheme(currentTheme(), false); }
            });
        }
    }

    /* ---------- 实时时钟 ---------- */
    function pad(n) { return (n < 10 ? '0' : '') + n; }
    function formatTime(d) {
        return d.getFullYear() + '-' + pad(d.getMonth() + 1) + '-' + pad(d.getDate()) + ' ' +
            pad(d.getHours()) + ':' + pad(d.getMinutes()) + ':' + pad(d.getSeconds());
    }
    function initClocks() {
        function tick() { $$('.js-clock').forEach(function (el) { el.textContent = formatTime(new Date()); }); }
        tick();
        setInterval(tick, 1000);
    }

    /* ---------- 名言条：点击格言本身切换 ---------- */
    function initQuoteRefresh() {
        $$('.js-quote').forEach(function (quote) {
            quote.addEventListener('click', function () {
                var list = $$('.js-quote-pool span', document); // 服务端把所有名言放入隐藏池
                if (!list.length) return;
                // 定位当前展示文本在池中的位置，避免换到下一条仍是同一条
                var currentText = quote.textContent;
                var cur = -1;
                for (var i = 0; i < list.length; i++) {
                    if (list[i].textContent === currentText) { cur = i; break; }
                }
                var n = list.length;
                var idx = Math.floor(Math.random() * n);
                if (n > 1 && cur !== -1) {
                    while (idx === cur) idx = (idx + 1) % n;
                }
                quote.textContent = list[idx].textContent;
            });
        });
    }

    /* ---------- 首页四大板块 hover 展开说明 ---------- */
    function initBoardHover() {
        var section = $('.js-boards');
        if (!section) return;
        var cards = $$('.js-board-card', section);
        var overlay = $('.js-board-panel', section);
        if (!cards.length || !overlay) return;
        var titleEl = $('.js-board-panel-title', overlay);
        var descEl = $('.js-board-panel-desc', overlay);
        var bodyEl = section;

        function showPanel(card) {
            var name = card.getAttribute('data-name') || '';
            var desc = card.getAttribute('data-desc') || '';
            var idx = cards.indexOf(card);
            if (titleEl) titleEl.textContent = name;
            if (descEl) descEl.textContent = desc;
            overlay.classList.remove('panel-left', 'panel-right');
            // 第 0 / 1 块吸附左侧边缘，第 2 / 3 块吸附右侧边缘（实际板块位置不变）
            if (idx === 0 || idx === 1) overlay.classList.add('panel-left');
            else overlay.classList.add('panel-right');
            overlay.classList.add('visible');
        }

        cards.forEach(function (card) {
            card.addEventListener('mouseenter', function () { showPanel(card); });
            card.addEventListener('click', function () { /* 点击由 <a> 包裹，这里无额外处理 */ });
        });
        section.addEventListener('mouseleave', function () { overlay.classList.remove('visible'); });
    }

    /* ---------- 搜索栏 ---------- */
    var DEFAULT_ENGINES = [
        { key: 'bing', name: 'Bing', icon: 'B', url: 'https://www.bing.com/search?q={kw}' },
        { key: 'baidu', name: '百度', icon: '度', url: 'https://www.baidu.com/s?wd={kw}' },
        { key: 'github', name: 'GitHub', icon: 'G', url: 'https://github.com/search?q={kw}' },
        { key: 'google', name: 'Google', icon: 'G', url: 'https://www.google.com/search?q={kw}' }
    ];

    function initSearch() {
        var box = $('.js-search');
        if (!box) return;
        var cfg = null;
        try { cfg = JSON.parse(box.getAttribute('data-engines') || 'null'); } catch (e) { cfg = null; }
        var engines = (cfg && cfg.length) ? cfg : DEFAULT_ENGINES;
        var curKey = box.getAttribute('data-engine') || engines[0].key;
        var cur = engines.filter(function (e) { return e.key === curKey; })[0] || engines[0];

        var input = $('.js-search-input', box);
        var clearBtn = $('.js-search-clear', box);
        var engineBtn = $('.js-engine-btn', box);
        var engineName = $('.js-engine-name', box);
        var menu = $('.js-engine-menu', box);

        function setEngine(e) {
            cur = e;
            // 按钮区域只显示图标（全称在展开下拉列表时展示）
            if (engineName) engineName.textContent = e.icon || '';
            if (engineBtn) engineBtn.title = '搜索引擎：' + e.name;
            box.setAttribute('data-engine', e.key);
            hideMenu();
        }
        function showMenu() {
            if (!menu) return;
            if (!menu.children.length) {
                engines.forEach(function (e) {
                    var li = document.createElement('li');
                    li.textContent = e.icon + ' ' + e.name;
                    li.className = (e.key === cur.key) ? 'active' : '';
                    li.addEventListener('click', function () { setEngine(e); });
                    menu.appendChild(li);
                });
            }
            menu.classList.add('open');
        }
        function hideMenu() { if (menu) menu.classList.remove('open'); }

        function updateClear() {
            if (clearBtn) clearBtn.style.visibility = (input && input.value) ? 'visible' : 'hidden';
        }
        function doSearch() {
            var kw = (input ? input.value : '').trim();
            if (!kw) { if (input) input.focus(); return; }
            window.open(cur.url.replace('{kw}', encodeURIComponent(kw)), '_blank', 'noopener');
        }

        if (engineBtn) engineBtn.addEventListener('click', function (ev) {
            ev.stopPropagation();
            if (menu && menu.classList.contains('open')) hideMenu(); else showMenu();
        });
        if (clearBtn) clearBtn.addEventListener('click', function () {
            if (input) { input.value = ''; input.focus(); }
            updateClear();
        });
        if (input) {
            input.addEventListener('input', updateClear);
            input.addEventListener('keydown', function (ev) { if (ev.key === 'Enter') doSearch(); });
        }
        document.addEventListener('click', function () { hideMenu(); });
        var goBtn = $('.js-search-go', box);
        if (goBtn) goBtn.addEventListener('click', doSearch);
        setEngine(cur);
        updateClear();
    }

    /* ---------- 后台图标控件：文本 / 图片上传（≤200KB → dataURL） ---------- */
    function isIconImage(v) {
        v = String(v || '').trim();
        if (!v) return false;
        if (/^data:image\//i.test(v) || /^https?:\/\//i.test(v)) return true;
        if (/\.(png|jpe?g|gif|svg|webp)(\?|#|$)/i.test(v)) return true;
        return v.charAt(0) === '/' || v.indexOf('./') === 0 || v.indexOf('../') === 0;
    }
    function updateIconPreview(ctl) {
        var input = ctl.querySelector('.icon-input');
        var box = ctl.querySelector('.icon-preview');
        if (!input || !box) return;
        var v = input.value.trim();
        box.innerHTML = '';
        if (!v) return;                 // 空：显示空心占位框
        if (isIconImage(v)) {
            var img = document.createElement('img');
            img.src = v;
            img.alt = '';
            img.loading = 'lazy';
            box.appendChild(img);
        } else {
            box.textContent = v;
        }
    }
    function initIconControls() {
        // 点击“上传”→ 触发隐藏 file
        document.addEventListener('click', function (ev) {
            var btn = ev.target && ev.target.closest ? ev.target.closest('.icon-upload') : null;
            if (!btn) return;
            var ctl = btn.closest('.icon-ctl');
            var file = ctl ? ctl.querySelector('.icon-file') : null;
            if (file) file.click();
        });
        // 选择图片 → 校验并转 dataURL 写入同控件文本框
        document.addEventListener('change', function (ev) {
            var file = ev.target;
            if (!file || !file.classList || !file.classList.contains('icon-file')) return;
            var ctl = file.closest('.icon-ctl');
            var input = ctl ? ctl.querySelector('.icon-input') : null;
            var f = file.files && file.files[0];
            function reset() { file.value = ''; }
            if (!f) return;
            if (f.type.indexOf('image/') !== 0) { alert('请选择图片文件。'); reset(); return; }
            if (f.size > 200 * 1024) { alert('图片不能超过 200KB。'); reset(); return; }
            var rd = new FileReader();
            rd.onload = function () {
                if (input) {
                    input.value = rd.result;
                    updateIconPreview(ctl);
                }
                reset();
            };
            rd.onerror = function () { alert('图片读取失败，请重试。'); reset(); };
            rd.readAsDataURL(f);
        });
        // 手动输入文本 → 实时预览
        document.addEventListener('input', function (ev) {
            var t = ev.target;
            if (t && t.classList && t.classList.contains('icon-input')) {
                updateIconPreview(t.closest('.icon-ctl'));
            }
        });
        // 初始化页面既有控件预览
        $$('.icon-ctl').forEach(updateIconPreview);
    }

    /* ---------- 复制 ---------- */
    function copyText(text, btnEl) {
        function done(ok) {
            if (!btnEl) return;
            var old = btnEl.textContent;
            btnEl.textContent = ok ? '✓ 已复制' : '复制失败';
            setTimeout(function () { btnEl.textContent = old; }, 1500);
        }
        if (navigator.clipboard && navigator.clipboard.writeText) {
            navigator.clipboard.writeText(text).then(function () { done(true); }, function () { fallbackCopy(text, done); });
        } else {
            fallbackCopy(text, done);
        }
    }
    function fallbackCopy(text, done) {
        var ta = document.createElement('textarea');
        ta.value = text;
        ta.style.cssText = 'position:fixed;opacity:0;';
        document.body.appendChild(ta);
        ta.select();
        try { done(document.execCommand('copy')); } catch (e) { done(false); }
        document.body.removeChild(ta);
    }
    function initCopyButtons() {
        document.addEventListener('click', function (ev) {
            var btn = ev.target.closest ? ev.target.closest('.js-copy') : null;
            if (!btn) return;
            var text = btn.getAttribute('data-copy');
            if (text === null || text === undefined) {
                var target = $(btn.getAttribute('data-target') || '');
                text = target ? target.value : '';
            }
            copyText(text, btn);
        });
    }

    /* ---------- 站点风格确认弹窗（回车确认 / Esc 取消 / 点击遮罩取消） ---------- */
    function escHtml(s) {
        return String(s).replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/"/g, '&quot;');
    }
    function siteConfirm(message, opts) {
        opts = opts || {};
        return new Promise(function (resolve) {
            var danger = opts.danger !== false;
            var okText = opts.okText || (danger ? '删除' : '确认');
            var overlay = document.createElement('div');
            overlay.className = 'sc-overlay';
            overlay.innerHTML =
                '<div class="sc-card" role="alertdialog" aria-modal="true">' +
                '<div class="sc-head">' + escHtml(opts.title || '操作确认') + '</div>' +
                '<div class="sc-body">' + escHtml(message || '') + '</div>' +
                '<div class="sc-foot">' +
                '<button type="button" class="btn btn-sm sc-cancel">' + escHtml(opts.cancelText || '取消') + '</button>' +
                '<button type="button" class="btn btn-sm ' + (danger ? 'btn-danger' : 'btn-primary') + ' sc-ok">' + escHtml(okText) + '</button>' +
                '</div></div>';
            var okBtn = overlay.querySelector('.sc-ok');
            var cancelBtn = overlay.querySelector('.sc-cancel');
            var finished = false;
            function close(val) {
                if (finished) return;
                finished = true;
                document.removeEventListener('keydown', onKey, true);
                if (overlay.parentNode) overlay.parentNode.removeChild(overlay);
                resolve(val);
            }
            function onKey(ev) {
                if (ev.key === 'Escape') { ev.preventDefault(); close(false); }
                else if (ev.key === 'Enter') { ev.preventDefault(); close(true); }
            }
            okBtn.addEventListener('click', function () { close(true); });
            cancelBtn.addEventListener('click', function () { close(false); });
            overlay.addEventListener('mousedown', function (ev) { if (ev.target === overlay) close(false); });
            document.addEventListener('keydown', onKey, true);
            document.body.appendChild(overlay);
            okBtn.focus();
        });
    }
    // 统一入口：旧浏览器/异常时回落原生 confirm（仍然以 Promise 风格使用）
    function askConfirm(message, opts) {
        return siteConfirm(message, opts);
    }
    // 表单：带 data-confirm="提示文案" 的表单提交前弹窗确认
    function bindConfirmForms() {
        document.addEventListener('submit', function (ev) {
            var f = ev.target;
            if (!f || !f.getAttribute || !f.hasAttribute('data-confirm')) return;
            ev.preventDefault();
            siteConfirm(f.getAttribute('data-confirm')).then(function (ok) {
                if (ok) { f.submit(); } else { hpClearScrollY(); }
            });
        });
    }

    /* ---------- 同页 POST 提交后保持滚动位置（整页刷新不再跳回顶部） ---------- */
    var HP_SCROLL_KEY = 'hp-scroll-pos';
    function hpSamePagePost(f) {
        if (!f || !f.method) return false;
        if (!/post/i.test(f.method)) return false;
        if (f.target === '_blank') return false;
        var a = (f.getAttribute('action') || '').trim();
        if (a === '') return true; // 无 action = 提交当前页
        try {
            var cur = new URL(location.href.split('#')[0]);
            var u = new URL(a, cur.href);
            return u.origin === cur.origin && u.pathname === cur.pathname;
        } catch (e) { return false; }
    }
    function hpSaveScrollY() {
        try {
            var y = window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop || 0;
            sessionStorage.setItem(HP_SCROLL_KEY, JSON.stringify({ p: location.pathname + location.search, y: y }));
        } catch (e) { /* ignore */ }
    }
    function hpClearScrollY() {
        try { sessionStorage.removeItem(HP_SCROLL_KEY); } catch (e) { /* ignore */ }
    }
    var hpScrollTarget = -1;
    function hpRestoreScrollY() {
        if (hpScrollTarget >= 0) { window.scrollTo(0, hpScrollTarget); return; }
        try {
            var raw = sessionStorage.getItem(HP_SCROLL_KEY);
            if (!raw) return;
            sessionStorage.removeItem(HP_SCROLL_KEY);
            var d = JSON.parse(raw);
            if (d && d.p === (location.pathname + location.search) && typeof d.y === 'number' && d.y > 0) {
                hpScrollTarget = d.y;
                window.scrollTo(0, hpScrollTarget);
            }
        } catch (e) { hpClearScrollY(); }
    }
    // 捕获阶段：同页 POST 提交前保存（按回车等也会触发 submit 事件）
    document.addEventListener('submit', function (ev) {
        if (hpSamePagePost(ev.target)) hpSaveScrollY();
    }, true);
    // 捕获阶段：点击提交按钮时也保存（bindConfirmForms 确认后走 f.submit() 不触发 submit 事件）
    document.addEventListener('click', function (ev) {
        var t = ev.target;
        var btn = (t && t.closest) ? t.closest('button[type="submit"], input[type="submit"], button:not([type])') : null;
        if (!btn) return;
        var f = btn.form || null;
        if (hpSamePagePost(f)) hpSaveScrollY();
    }, true);
    // 资源加载完成后再定位一次，防止图片等异步资源改变高度造成轻微偏移
    window.addEventListener('load', function () {
        if (hpScrollTarget >= 0) {
            window.scrollTo(0, hpScrollTarget);
            hpScrollTarget = -1;
        }
    });

    /* ---------- 首页访客信息（hero 信息模式：补齐屏幕分辨率 / 系统语言） ---------- */
    function initVisitorInfo() {
        var box = $('.js-visitor-box');
        if (!box) return;
        var langEl = $('.js-vlang', box);
        if (langEl) {
            var lang = '';
            try { lang = navigator.language || (navigator.languages && navigator.languages[0]) || ''; } catch (e) { /* ignore */ }
            langEl.textContent = lang || '--';
        }
        var scrEl = $('.js-vscreen', box);
        if (scrEl) {
            var w = 0, h = 0, dpr = 1;
            try { w = window.screen.width || 0; h = window.screen.height || 0; dpr = window.devicePixelRatio || 1; } catch (e) { /* ignore */ }
            if (w && h) {
                var ratio = Math.round(dpr * 100);
                scrEl.textContent = (ratio !== 100) ? (w + ' × ' + h + '（' + ratio + '%）') : (w + ' × ' + h);
            }
        }
    }

    /* ---------- 返回顶部（右下角按钮；滚动后出现，回到顶部即隐藏） ---------- */
    function initToTop() {
        var btn = document.querySelector('.js-to-top');
        if (!btn) return;
        var doc = document.scrollingElement || document.documentElement;
        var containers = [];
        var ticking = false;

        function currentY() {
            var y = window.pageYOffset || (doc && doc.scrollTop) || 0;
            for (var i = 0; i < containers.length; i++) {
                var t = containers[i].scrollTop || 0;
                if (t > y) y = t;
            }
            return y;
        }
        function apply() {
            ticking = false;
            btn.classList.toggle('show', currentY() > 180);
        }
        function schedule() {
            if (ticking) return;
            ticking = true;
            if (window.requestAnimationFrame) window.requestAnimationFrame(apply);
            else setTimeout(apply, 30);
        }
        // 捕获阶段监听：主文档与任意内滚容器的滚动都能收到，避免漏触发
        document.addEventListener('scroll', schedule, true);
        window.addEventListener('resize', schedule, { passive: true });

        // 采集内滚容器：DOM 就绪与资源加载后各测一次（布局完成后才能正确判断是否溢出）
        function collect() {
            var list = document.querySelectorAll('main, section, article, div, ul, ol');
            Array.prototype.forEach.call(list, function (el) {
                if (el === btn || containers.indexOf(el) >= 0) return;
                if (el.closest('.admin-side, .hp-toasts, .art-topbar')) return; // 侧栏/弹窗/顶栏自身滚动不应触发
                if (el.scrollHeight <= el.clientHeight + 40) return;
                var cs;
                try { cs = window.getComputedStyle(el); } catch (e) { return; }
                if (cs.position === 'fixed' || cs.position === 'sticky') return;
                if (cs.overflowY === 'auto' || cs.overflowY === 'scroll') containers.push(el);
            });
            apply();
        }
        collect();
        if (document.readyState !== 'complete') window.addEventListener('load', collect);

        btn.addEventListener('click', function () {
            btn.classList.remove('show'); // 乐观隐藏，避免到顶后仍残留
            for (var i = 0; i < containers.length; i++) {
                if (containers[i].scrollTop > 0) containers[i].scrollTop = 0;
            }
            if (doc && doc.scrollTop > 0) {
                try { doc.scrollTo({ top: 0, behavior: 'smooth' }); } catch (e) { doc.scrollTop = 0; }
            } else {
                try { window.scrollTo({ top: 0, behavior: 'smooth' }); } catch (e) { window.scrollTo(0, 0); }
            }
            schedule();
        });
        schedule();
    }

    /* ---------- 后台侧边栏：收缩 / 移动端抽屉 / 本页功能锚点 ---------- */
    function initAdminSide() {
        var side = document.querySelector('.admin-side');
        if (!side) return;
        var body = document.body;
        var mq = window.matchMedia ? window.matchMedia('(max-width: 900px)') : null;
        function isMobile() { return mq ? mq.matches : window.innerWidth <= 900; }

        // 收缩（桌面）/ 抽屉开关（小屏）
        Array.prototype.forEach.call(document.querySelectorAll('.js-admin-side-toggle'), function (btn) {
            btn.addEventListener('click', function () {
                if (isMobile()) {
                    body.classList.toggle('hp-side-open');
                } else {
                    var collapsed = body.classList.toggle('hp-side-collapsed');
                    try { localStorage.setItem('hp-admin-side-collapsed', collapsed ? '1' : '0'); } catch (e) { /* ignore */ }
                }
            });
        });
        var mask = document.getElementById('adminSideMask');
        if (mask) mask.addEventListener('click', function () { body.classList.remove('hp-side-open'); });
        window.addEventListener('resize', function () { if (!isMobile()) body.classList.remove('hp-side-open'); });
        Array.prototype.forEach.call(side.querySelectorAll('a'), function (a) {
            a.addEventListener('click', function () { if (isMobile()) body.classList.remove('hp-side-open'); });
        });

        // 采集当前页“本页功能”：fieldset-card 的标题
        var secWrap = document.getElementById('adminSideSections');
        var secList = document.getElementById('adminSideSectionList');
        if (!secWrap || !secList) return;
        var items = [];
        Array.prototype.forEach.call(document.querySelectorAll('.fieldset-card'), function (card) {
            var t = card.querySelector('.fs-title');
            if (!t) return;
            var clone = t.cloneNode(true);
            Array.prototype.forEach.call(clone.querySelectorAll('.tip'), function (n) { if (n.parentNode) n.parentNode.removeChild(n); });
            var text = (clone.textContent || '').replace(/\s+/g, ' ').trim();
            if (text === '') return;
            items.push({ el: card, text: text });
        });
        if (items.length < 1) return;
        var idx = 0;
        items.forEach(function (it) {
            idx++;
            if (!it.el.id) it.el.id = 'hp-sec-' + idx;
            var a = document.createElement('a');
            a.className = 'as-sub';
            a.href = '#' + it.el.id;
            a.textContent = it.text;
            a.title = it.text;
            a.addEventListener('click', function (ev) {
                ev.preventDefault();
                try { it.el.scrollIntoView({ behavior: 'smooth', block: 'start' }); }
                catch (e) { it.el.scrollIntoView(); }
            });
            secList.appendChild(a);
        });
        secWrap.hidden = false;

        // 高亮当前可视区块
        var subs = secList.querySelectorAll('.as-sub');
        function spy() {
            var best = -1, bestTop = -Infinity;
            for (var i = 0; i < items.length; i++) {
                var top = items[i].el.getBoundingClientRect().top - 120;
                if (top <= 0 && top > bestTop) { bestTop = top; best = i; }
            }
            for (var j = 0; j < subs.length; j++) subs[j].classList.toggle('active', j === best);
        }
        var st = false;
        function onScroll() {
            if (st) return;
            st = true;
            if (window.requestAnimationFrame) window.requestAnimationFrame(function () { st = false; spy(); });
            else { st = false; spy(); }
        }
        document.addEventListener('scroll', onScroll, true);
        window.addEventListener('resize', onScroll);
        spy();
    }

    /* ---------- 登录页：采集设备信息（系统 / 机型 / 屏幕等，能拿到什么就带什么）随表单一并提交 ---------- */
    function initLoginDevice() {
        var field = document.getElementById('devField');
        if (!field) return;
        function baseInfo() {
            var info = {};
            try {
                info.ua = navigator.userAgent || '';
                info.platform = navigator.platform || '';
                info.lang = navigator.language || '';
                info.screen = (window.screen && screen.width && screen.height) ? (screen.width + '×' + screen.height + '@' + (window.devicePixelRatio || 1)) : '';
                info.touch = ('ontouchstart' in window) || (navigator.maxTouchPoints > 0);
            } catch (e) { /* ignore */ }
            return info;
        }
        function fill() {
            try { field.value = JSON.stringify(baseInfo()); } catch (e) { /* ignore */ }
        }
        fill();
        // Chromium 系 UA-CH：可拿到机型（model）、系统版本、架构等高熵值
        try {
            if (navigator.userAgentData && navigator.userAgentData.getHighEntropyValues) {
                navigator.userAgentData.getHighEntropyValues(['platform', 'platformVersion', 'architecture', 'model', 'uaFullVersion'])
                    .then(function (h) {
                        var info = baseInfo();
                        info.uch = h || {};
                        field.value = JSON.stringify(info);
                    })
                    .catch(function () { /* ignore */ });
            }
        } catch (e) { /* ignore */ }
    }

    /* ---------- 风控管理页：筛选 / 翻页局部刷新（不整页跳转、不回到顶部） ---------- */
    function initVisitsAjax() {
        var boxes = {
            access: document.getElementById('visResults'),
            loginfail: document.getElementById('lfResults')
        };
        if (!boxes.access && !boxes.loginfail) return;

        function serialize(form) {
            var parts = [];
            var els = form.elements;
            for (var i = 0; i < els.length; i++) {
                var el = els[i];
                if (!el.name || el.disabled) continue;
                var t = (el.type || '').toLowerCase();
                if ((t === 'checkbox' || t === 'radio') && !el.checked) continue;
                parts.push(encodeURIComponent(el.name) + '=' + encodeURIComponent(el.value));
            }
            return parts.join('&');
        }
        function load(section, query, pushUrl) {
            var box = boxes[section];
            if (!box) return;
            box.classList.add('vis-loading');
            var xhr = new XMLHttpRequest();
            try {
                xhr.open('GET', 'visits_data.php?section=' + encodeURIComponent(section) + (query ? ('&' + query) : ''), true);
                xhr.setRequestHeader('X-Requested-With', 'XMLHttpRequest');
                xhr.onreadystatechange = function () {
                    if (xhr.readyState !== 4) return;
                    box.classList.remove('vis-loading');
                    if (xhr.status === 200) {
                        box.innerHTML = xhr.responseText;
                        if (pushUrl && history.replaceState) {
                            history.replaceState(null, '', 'visits.php' + (query ? ('?' + query) : ''));
                        }
                    } else {
                        box.innerHTML = '<div class="err-msg">加载失败（可能登录状态已失效），请刷新页面后重试。</div>';
                    }
                };
                xhr.send();
            } catch (e) {
                box.classList.remove('vis-loading');
            }
        }
        // 筛选表单（事件委托，局部刷新后依然有效）
        document.addEventListener('submit', function (ev) {
            var form = ev.target;
            if (!form || !form.getAttribute || !form.hasAttribute('data-vis-form')) return;
            if (!/get/i.test(form.method || '')) return;
            ev.preventDefault();
            load(form.getAttribute('data-vis-form'), serialize(form), true);
        }, true);
        // 分页链接（委托到 document，避开局部刷新后监听丢失）
        document.addEventListener('click', function (ev) {
            var a = (ev.target && ev.target.closest) ? ev.target.closest('a[data-vis-page]') : null;
            if (!a) return;
            ev.preventDefault();
            load(a.getAttribute('data-vis-section') || 'access', a.getAttribute('data-vis-page') || '', true);
        }, true);
    }

    /* ---------- 功能区静态工具页：库卡片 ?from=nav 进入时，返回按钮改为“返回上一页” ---------- */
    function initFuncBack() {
        var el = document.querySelector('.js-fb-back');
        if (!el) return;
        if (!/(?:^|[?&])from=nav(?:&|$)/.test(location.search)) return;
        el.textContent = '← 返回上一页';
        el.title = '返回上一页（回到来源库首页）';
        el.addEventListener('click', function (ev) {
            // 有浏览历史时返回来源页；否则保留默认 href（功能区首页）
            if (window.history.length > 1) {
                ev.preventDefault();
                window.history.back();
            }
        });
    }

    /* ---------- 右下角 Toast 通知（后台整页刷新后的成功/失败提示使用，不影响页面布局） ---------- */
    function hpToast(kind, text, dur) {
        if (text === '' || text === null || typeof text === 'undefined') return;
        kind = (kind === 'ok' || kind === 'err') ? kind : 'ok';
        var wrap = document.querySelector('.hp-toasts');
        if (!wrap) {
            wrap = document.createElement('div');
            wrap.className = 'hp-toasts';
            document.body.appendChild(wrap);
        }
        var box = document.createElement('div');
        box.className = 'hp-toast ' + kind;
        var ic = document.createElement('span');
        ic.className = 'ht-ic';
        ic.textContent = kind === 'ok' ? '✓' : '!';
        var tx = document.createElement('div');
        tx.className = 'ht-tx';
        tx.textContent = String(text);
        var x = document.createElement('button');
        x.type = 'button';
        x.className = 'ht-x';
        x.setAttribute('aria-label', '关闭提示');
        x.textContent = '×';
        function close() {
            if (!box.parentNode) return;
            box.classList.add('hide');
            setTimeout(function () {
                if (box.parentNode) box.parentNode.removeChild(box);
                if (wrap.parentNode && !wrap.children.length) wrap.parentNode.removeChild(wrap);
            }, 240);
        }
        x.addEventListener('click', close);
        box.appendChild(ic);
        box.appendChild(tx);
        box.appendChild(x);
        wrap.appendChild(box);
        var delay = (typeof dur === 'number' && dur > 0) ? dur : (kind === 'err' ? 6000 : 3600);
        setTimeout(close, delay);
    }
    /* 由 PHP 注入的整页操作提示（window.hpToastMsg = {kind, text}）自动弹出 */
    function hpShowPageToast() {
        var m = window.hpToastMsg;
        if (!m || typeof m !== 'object') return;
        hpToast(m.kind, m.text);
    }

    /* ---------- 静态工具页 favicon 跟随后台站点 logo（api/site.php 探测，异常静默回退默认） ---------- */
    function initSiteIcon() {
        // 仅纯静态 .html 页需要（PHP 页面 favicon 已由 layout_head 服务端输出）
        if (!/\.html$/i.test(location.pathname)) return;
        var iconEl = document.querySelector('link[rel~="icon"]');
        if (!iconEl) return;
        var abs = '';
        try { abs = new URL(iconEl.getAttribute('href') || '', location.href).href; } catch (e) { return; }
        var marker = '/assets/img/logo.svg';
        var pos = abs.indexOf(marker);
        if (pos < 0) return; // 非默认图标（已自定义）则无需处理
        var root = abs.slice(0, pos + 1);
        var xhr = new XMLHttpRequest();
        try {
            xhr.open('GET', root + 'api/site.php', true);
            xhr.timeout = 4000;
            xhr.onreadystatechange = function () {
                if (xhr.readyState !== 4) return;
                try {
                    var d = JSON.parse(xhr.responseText || '{}');
                    if (d && typeof d.logo === 'string' && d.logo !== '') {
                        iconEl.href = root + d.logo;
                    }
                } catch (e) { /* 接口异常：保持默认图标 */ }
            };
            xhr.onerror = function () { /* file:// 或网络异常：保持默认图标 */ };
            xhr.send();
        } catch (e) { /* 同源限制等：保持默认图标 */ }
    }

    /* ---------- 自动初始化 ---------- */
    document.addEventListener('DOMContentLoaded', function () {
        initSiteIcon();
        initTheme();
        initClocks();
        initQuoteRefresh();
        initBoardHover();
        initSearch();
        initIconControls();
        initCopyButtons();
        bindConfirmForms();
        initVisitorInfo();
        initLoginDevice();
        initVisitsAjax();
        initAdminSide();
        initToTop();
        initFuncBack();
        hpShowPageToast();
    });

    global.HomePage = {
        $: $, $$: $$, copyText: copyText, applyTheme: applyTheme, currentTheme: currentTheme,
        confirm: siteConfirm, ask: askConfirm, toast: hpToast
    };
    // 底部脚本执行时 DOM 已解析完毕：在首帧绘制前后尽早恢复滚动位置，避免“先停在顶部再跳回”的大幅跳动
    hpRestoreScrollY();
})(window);