var CONFIG = {
        baseUrl: '',                    // API基础路径，留空则自动获取
        chatUrl: 'https://aiyy.ccut.edu.cn/ai/h5/chat/wszs',        // 非流式接口
        streamUrl: 'https://aiyy.ccut.edu.cn/ai/h5/stream/wszs',     // 流式接口
        healthUrl: 'https://aiyy.ccut.edu.cn/ai/health',        // 健康检查
        timeout: 30000,                 // 请求超时(ms)
        streamTimeout: 120000,          // 流式超时(ms)
        maxRetry: 2,                    // 最大重试次数
        retryDelay: 1000                // 重试延迟基数(ms)
    };
 
(function(global) {
    'use strict';

    // ==================== 配置 ====================
    var CFG = (global.EnrollFloatConfig || {});
    var CONFIG = {
        robotImg: CFG.robotImg || 'https://aiyy.ccut.edu.cn/fdai/robot.png',
        botName: CFG.botName || '网数小助手',
        title: CFG.title || '信息化小助手',
        placeholder: CFG.placeholder || '请输入您想咨询的问题...',
        welcome: CFG.welcome ||  JSON.stringify("您好，我是信息化小助手，您在使用校园信息化服务遇到问题可以咨询我。\n").slice(1, -1)
    };

    // 如果robotImg为空，尝试自动推断
    if (!CONFIG.robotImg) {
        var scriptPath = (document.currentScript && document.currentScript.src) || '';
        if (scriptPath) {
            var base = scriptPath.substring(0, scriptPath.lastIndexOf('/') + 1);
            CONFIG.robotImg = base.replace(/\/js\//, '/') + 'robot.png';
        } else {
            CONFIG.robotImg = 'enrollment/robot.png';
        }
    }

    var IMG_REGEX = /(https?:\/\/[^\s"')]+\.(?:jpg|jpeg|png|gif|webp|bmp|svg)(?:\?[^\s"')]*)?)/gi;

    // ==================== DOM ====================
    var root = null;
    var trigger = null;
    var win = null;
    var messagesEl = null;
    var textarea = null;
    var sendBtn = null;

    // ==================== 状态 ====================
    var state = {
        open: false,
        expanded: false,
        sending: false,
        aiBubble: null,
        aiRawText: '',
        greetingIdx: 0
    };

    var GREETINGS = [
       
    ];

    // ==================== 初始化 ====================

    function init() {
        buildDOM();
        bindEvents();
        appendWelcome();
        console.log('[EnrollFloat] 悬浮组件已初始化');
    }

    function buildDOM() {
        root = document.createElement('div');
        root.className = 'enroll-float-root';
        root.innerHTML =
            // ---- 触发器（小机器人） ----
            '<div class="enroll-float-trigger" id="efTrigger">' +
            '  <div class="enroll-float-hint">点我咨询</div>' +
            '  <div class="enroll-float-avatar">' +
            '    <img src="' + escAttr(CONFIG.robotImg) + '" alt="' + escAttr(CONFIG.botName) + '">' +
            '  </div>' +
            '</div>' +
            // ---- 对话窗口 ----
            '<div class="enroll-float-window" id="efWindow">' +
            '  <!-- 头部 -->' +
            '  <div class="enroll-float-header">' +
            '    <div class="enroll-float-header-left">' +
            '      <div class="enroll-float-header-avatar">' +
            '        <img src="' + escAttr(CONFIG.robotImg) + '" alt="">'+
            '      </div>' +
            '      <div class="enroll-float-header-info">' +
            '        <span class="enroll-float-header-title">' + escHtml(CONFIG.title) + '</span>' +
            '        <span class="enroll-float-header-status"><span class="enroll-float-status-dot"></span>' + CONFIG.botName + '在线</span>' +
            '      </div>' +
            '    </div>' +
            '    <div class="enroll-float-header-actions">' +
            '      <button class="enroll-float-btn-icon" id="efBtnExpand" title="展开/收起">⤢</button>' +
            '      <button class="enroll-float-btn-icon" id="efBtnClose" title="关闭">✕</button>' +
            '    </div>' +
            '  </div>' +
            '  <!-- 消息区 -->' +
            '  <div class="enroll-float-messages" id="efMessages"></div>' +
            '  <!-- 输入区 -->' +
            '  <div class="enroll-float-input-area">' +
            '    <div class="enroll-float-input-wrap">' +
            '      <textarea class="enroll-float-textarea" id="efTextarea" rows="1"' +
            '        placeholder="' + escAttr(CONFIG.placeholder) + '"' +
            '        maxlength="500"></textarea>' +
            '      <button class="enroll-float-send-btn" id="efSendBtn" disabled title="发送(Enter)">' +
            '        <svg viewBox="0 0 24 24" width="16" height="16" fill="currentColor"><path d="M2.01 21L23 12 2.01 3 2 10l15 2-15 2z"/></svg>' +
            '      </button>' +
            '    </div>' +
            '  </div>' +
            '</div>';

        document.body.appendChild(root);

        trigger = document.getElementById('efTrigger');
        win = document.getElementById('efWindow');
        messagesEl = document.getElementById('efMessages');
        textarea = document.getElementById('efTextarea');
        sendBtn = document.getElementById('efSendBtn');
    }


    // ==================== 事件绑定 ====================

    function bindEvents() {
        // 点击触发器 → 打开窗口
        trigger.addEventListener('click', openWindow);

        // 关闭按钮 → 关闭窗口
        document.getElementById('efBtnClose').addEventListener('click', closeWindow);

        // 展开按钮 → 展开/还原
        document.getElementById('efBtnExpand').addEventListener('click', toggleExpand);

        // 输入框
        textarea.addEventListener('input', onInput);
        textarea.addEventListener('keydown', function(e) {
            if (e.key === 'Enter' && !e.shiftKey) { e.preventDefault(); doSend(); }
        });

        // 发送按钮
        sendBtn.addEventListener('click', doSend);
    }

    function onInput() {
        sendBtn.disabled = !textarea.value.trim() || state.sending;
        autoResize();
    }
    function autoResize() {
        textarea.style.height = 'auto';
        textarea.style.height = Math.min(textarea.scrollHeight, 90) + 'px';
    }


    // ==================== 窗口控制 ====================

    function openWindow() {
        state.open = true;
        trigger.classList.add('hidden');

        win.classList.add('show');
        void win.offsetWidth;  // 强制重排
        win.classList.add('visible');

        setTimeout(function() { textarea.focus(); }, 280);
    }

    function closeWindow() {
        state.open = false; state.expanded = false;
        win.classList.remove('visible', 'expanded');
        setTimeout(function() {
            win.classList.remove('show');
            trigger.classList.remove('hidden');
        }, 260);
    }

    function toggleExpand() {
        state.expanded = !state.expanded;
        win.classList.toggle('expanded', state.expanded);
        // 展开后聚焦消息区方便滚动查看
        if (state.expanded) messagesEl.scrollTop = messagesEl.scrollHeight;
    }


    // ==================== 欢迎消息 ====================

    function appendWelcome() {
        var text = CONFIG.welcome ||
            ('');
//        text = text.replace(/\\\\n/g, "\n");
        text = text.replace(/\\n/g, '<br>');
       
        var el = document.createElement('div');
        el.className = 'ef-welcome';
        el.innerHTML = '<div class="ef-welcome-bubble">' + text + '</div>';
        messagesEl.appendChild(el);
    }


    // ==================== 发送 & 接收 ====================

    function doSend() {
        var msg = textarea.value.trim();
        if (!msg || state.sending) return;

        appendMsg(msg, 'user');
        textarea.value = ''; onInput();

        state.sending = true;
        state.aiBubble = null; state.aiRawText = '';

        showTyping();

        AiApi.chatStream(msg, {
            onMessage: function(text, isOver) {
                if (isOver) { removeTyping(); finishSending(); }
                else { appendAiChunk(text); }
            },
            onSyncData: function(sid) { console.log('[EnrollFloat] Session:', sid); },
            onError: function(err) {
                removeTyping();
                showError((err && err.message) || '出错了，请重试');
                finishSending();
            }
        }).catch(function(e) {
            removeTyping();
            showError(((e && e.error) || '网络连接异常'));
            finishSending();
        });
    }

    function finishSending() {
        state.sending = false;
        sendBtn.disabled = !textarea.value.trim();
    }


    // ==================== 消息渲染 ====================

    /** 滚动到最新 */
    function scrollToBottom() {
        requestAnimationFrame(function() {
            requestAnimationFrame(function() {
                messagesEl.scrollTo({ top: messagesEl.scrollHeight, behavior: 'smooth' });
            });
        });
    }

    function appendMsg(text, role) {
        var row = document.createElement('div');
        row.className = 'ef-msg-row' + (role === 'user' ? ' user' : '');

        var isUser = role === 'user';

        if (isUser) {
            row.innerHTML =
                '<div class="ef-avatar">👤</div>' +
                '<div class="ef-bubble">' + escHtml(text) + '</div>';
        } else {
            row.innerHTML =
                '<div class="ef-avatar"><img src="' + escAttr(CONFIG.robotImg) + '" alt=""></div>' +
                '<div class="ef-bubble"><div class="ef-md-body">' + text + '</div></div>';
        }

        messagesEl.appendChild(row);
        scrollToBottom();
        return row;
    }

    function appendAiChunk(text) {
        if (!state.aiBubble) {
            var row = appendMsg('', 'ai');
            var bubble = row.querySelector('.ef-bubble');
            bubble.innerHTML = '<div class="ef-md-body"></div>';
            state.aiBubble = bubble.querySelector('.ef-md-body');
            state.aiRawText = '';
        }
        state.aiRawText += text;
        try {
            state.aiBubble.innerHTML = Marked.parse(state.aiRawText) || '';
            processImages(state.aiBubble);
        } catch (e) {
            state.aiBubble.textContent = state.aiRawText;
        }
        scrollToBottom();
    }

    function showTyping() {
        var row = document.createElement('div');
        row.className = 'ef-msg-row'; row.id = 'efTypingRow';
        row.innerHTML =
            '<div class="ef-avatar"><img src="' + escAttr(CONFIG.robotImg) + '" alt=""></div>' +
            '<div class="ef-bubble"><div class="ef-typing"><span></span><span></span><span></span></div></div>';
        messagesEl.appendChild(row);
        scrollToBottom();
    }

    function removeTyping() {
        var el = document.getElementById('efTypingRow');
        if (el) el.remove();
    }

    function showError(msg) {
        var row = document.createElement('div');
        row.className = 'ef-msg-row';
        row.innerHTML =
            '<div class="ef-avatar">⚠️</div>' +
            '<div class="ef-bubble ef-error">❌ ' + escHtml(msg) + '</div>';
        messagesEl.appendChild(row);
        scrollToBottom();
        state.aiBubble = null;
    }

    // 打招呼（点击机器人头像时）
    function sayHi() {
        var g = GREETINGS[state.greetingIdx % GREETINGS.length];
        state.greetingIdx++;
        if (!state.open) openWindow();
        setTimeout(function() { appendMsg(g, 'ai'); }, 100);
    }


    // ==================== 图片处理 ====================

    function processImages(containerEl) {
        if (!containerEl) return;

        // 裸URL图片 → img标签
        var walker = document.createTreeWalker(containerEl, NodeFilter.SHOW_TEXT, null, false);
        var nodes = [];
        while (walker.nextNode()) nodes.push(walker.currentNode);
        nodes.forEach(function(node) {
            var txt = node.textContent;
            if (!IMG_REGEX.test(txt)) return;
            var frag = document.createDocumentFragment(), lastIdx = 0;
            txt.replace(IMG_REGEX, function(m, url, off) {
                if (off > lastIdx) frag.appendChild(document.createTextNode(txt.substring(lastIdx, off)));
                frag.appendChild(createImg(url.trim()));
                lastIdx = off + m.length; return m;
            });
            if (lastIdx < txt.length) frag.appendChild(document.createTextNode(txt.substring(lastIdx)));
            node.parentNode.replaceChild(frag, node);
        });

        // <a href=图片url> → 还原为<img>
        containerEl.querySelectorAll('a').forEach(function(a) {
            var h = (a.getAttribute('href') || '').trim();
            if (h && IMG_REGEX.test(h)) {
                var img = createImg(h); img.alt = a.textContent.trim() || '图片';
                a.parentNode.replaceChild(img, a);
            }
        });

        // 已有<img>统一样式
        containerEl.querySelectorAll('img').forEach(function(img) {
            if (img.classList.contains('ef-img')) return;
            styleImg(img);
        });
    }

    function createImg(src) {
        var img = document.createElement('img'); img.src = src; img.alt = '图片';
        img.loading = 'lazy'; styleImg(img); return img;
    }

    function styleImg(img) {
        img.className = 'ef-img';
        img.onerror = function() {
            this.style.cssText = 'min-height:60px;background:#f1f5f9;display:flex;align-items:center;';
            this.alt = '图片加载失败';
        };
        img.onclick = function(e) { e.preventDefault(); preview(this.src); };
    }

    function preview(src) {
        hidePreview();
        var ov = document.createElement('div'); ov.className = 'ef-img-overlay';
        ov.id = 'efImgOv';
        var img = document.createElement('img'); img.src = src; ov.appendChild(img);
        ov.onclick = hidePreview; document.body.appendChild(ov);
    }
    function hidePreview() {
        var el = document.getElementById('efImgOv');
        if (el) el.remove();
    }


    // ==================== 工具函数 ====================

    function escHtml(t) { var d=document.createElement('div'); d.textContent=t; return d.innerHTML; }
    function escAttr(t) { return String(t).replace(/&/g,'&amp;').replace(/"/g,'&quot;').replace(/'/g,'&#39;').replace(/</g,'&lt;').replace(/>/g,'&gt;'); }


    // ==================== 启动 ====================

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

})(window);