Blame for frontend_cache/app.js

// ==========================================================================
// 📝 TODO (Architecture / Enhancements)
// ==========================================================================
// 1. [Prompt Presets] 实现基于 ID 的 Prompt 远程动态加载
//    - 方案：将超长 Prompt 抽离为集中的 JSON 文件（如: prompt-assets/presets.json）。
//    - 逻辑：图库 (Gallery) 跳转时仅传递 ?id=xxx，前端 (Studio) 接收到 ID 后，跨域 fetch 该 JSON 并自动填充 Prompt 输入框。
//    - 优点：彻底解决 URL 长度限制，实现前后端数据彻底解耦，方便统一维护。
// commit@70f742a386b9cbbfd6df774b19d727485ef5446f


// ==========================================================================
// 🛡️ Dynamic API Base URL
// ==========================================================================
const hostname = window.location.hostname;
let API_BASE_URL = "";

// 1. 如果在 GUI 预览环境（哪怕带 .static 后缀）
if (hostname.includes("universal-lora-studio-gui")) {
    API_BASE_URL = "https://waveshaker-universal-lora-studio-test.hf.space";
}
// 2. 如果在本地开发环境
else if (hostname === "localhost" || hostname === "127.0.0.1") {
    API_BASE_URL = "https://waveshaker-universal-lora-studio-test.hf.space";
}
// 3. 如果在测试环境（test Space）
else if (hostname.includes("universal-lora-studio-test")) {
    API_BASE_URL = ""; // 同源，走相对路径
}
// 4. 如果在线上环境（prod Space）
else if (hostname.includes("universal-lora-studio.hf.space") || hostname.includes("universal-lora-studio.static")) {
    API_BASE_URL = ""; // 同源，走相对路径
}
// ==========================================================================
// 🔐 ZeroGPU Token Handshake
// ==========================================================================
const ZEROGPU_HEADERS_MSG = "supports-zerogpu-headers";

// 监听 HF 父窗口发来的握手信号
window.addEventListener("message", (event) => {
    if (event.data === ZEROGPU_HEADERS_MSG) {
        window.supports_zerogpu_headers = true;
    }
});

// 向父窗口声明支持，触发后续的 token 索要流程
(function announceZeroGpuSupport() {
    const hostname = window.location.hostname;
    if (!hostname.endsWith(".hf.space") && !hostname.includes(".dev.")) {
        return; // 非 HF 环境，不执行
    }
    const origin = hostname.includes(".dev.")
        ? `https://moon-${hostname.split(".")[1]}.dev.spaces.huggingface.tech`
        : "https://huggingface.co";
    try {
        window.parent.postMessage(ZEROGPU_HEADERS_MSG, origin);
    } catch (e) {
        console.warn("ZeroGPU handshake failed:", e);
    }
})();

// 向父窗口索要 x-ip-token（带 2 秒超时兜底）
async function requestZeroGpuToken() {
    if (!window.supports_zerogpu_headers) return null;

    const hostname = window.location.hostname;
    if (!hostname.endsWith(".hf.space") && !hostname.includes(".dev.")) return null;

    const origin = hostname.includes(".dev.")
        ? `https://moon-${hostname.split(".")[1]}.dev.spaces.huggingface.tech`
        : "https://huggingface.co";

    try {
        return await new Promise((resolve) => {
            const channel = new MessageChannel();
            const timeout = setTimeout(() => {
                channel.port1.close();
                resolve(null);
            }, 2000);
            channel.port1.onmessage = ({ data }) => {
                clearTimeout(timeout);
                resolve(data || null);
            };
            window.parent.postMessage("zerogpu-headers", origin, [channel.port2]);
        });
    } catch {
        return null;
    }
}

// ==========================================================================
// 🛡️ API Layer
// ==========================================================================


const BackendAPI = {
    // 1. 心跳检测
    checkHealth: async function() {
        try {
            const controller = new AbortController();
            const timeoutId = setTimeout(() => controller.abort(), 3000);

            const res = await fetch(`${API_BASE_URL}/api/health`, { 
                signal: controller.signal,
                cache: 'no-store'
            });
            clearTimeout(timeoutId);
            
            if (res.ok) {
                const data = await res.json();
                return data.status === "ok";
            }
            return false;
        } catch (error) {
            return false;
        }
    },

    // 2. 获取全局配置 (Sampler/Scheduler & Root Mapping)
    getConfig: async function() {
        try {
            const res = await fetch(`${API_BASE_URL}/api/config`, {
                method: 'GET',
                cache: 'no-store'
            });
            if (!res.ok) throw new Error("HTTP error " + res.status);
            return await res.json();
        } catch (error) {
            console.warn("⚠️ Failed to fetch config", error);
            return null;
        }
    },

    // 3. 获取 Base Model 列表
    getModels: async function() {
        const res = await fetch(`${API_BASE_URL}/api/models`, {
            method: 'GET',
            cache: 'no-store'
        });
        if (!res.ok) throw new Error("HTTP error " + res.status);
        return await res.json();
    },

    // 4. 获取角色 LoRA 图库数据
    getLoras: async function() {
        const controller = new AbortController();
        const timeoutId = setTimeout(() => controller.abort(), 10000); // 10秒超时

        try {
            const res = await fetch(`${API_BASE_URL}/api/loras`, {
                method: 'GET',
                cache: 'no-store',
                signal: controller.signal
            });
            clearTimeout(timeoutId);
            if (!res.ok) throw new Error("HTTP error " + res.status);
            return await res.json();
        } catch (error) {
            clearTimeout(timeoutId);
            throw error;
        }
    },

    // 5. 提交生成任务
    submitGenerate: async function(payload) {
        const headers = { 'Content-Type': 'application/json' };
        
        const tokenInfo = await requestZeroGpuToken();
        if (tokenInfo) {
            if (typeof tokenInfo === 'object') {
                Object.assign(headers, tokenInfo);
            } else if (typeof tokenInfo === 'string') {
                headers['x-ip-token'] = tokenInfo;
            }
        }

        const res = await fetch(`${API_BASE_URL}/api/generate`, {
            method: 'POST',
            cache: 'no-store',
            headers: headers,
            body: JSON.stringify(payload)
        });
        if (!res.ok) throw new Error(`HTTP error! status: ${res.status}`);
        const data = await res.json();
        if (data.status === "error") throw new Error(data.message);
        return data.task_id;
    },

    // 6. 轮询任务状态
    pollStatus: async function(taskId, callbacks, retries = 0) {
        const MAX_RETRIES = 150;

        try {
            const res = await fetch(`${API_BASE_URL}/api/status/${taskId}`, {
                cache: 'no-store'
            });
            const data = await res.json();

            if (data.status === "processing" || data.status === "queued") {
                if (callbacks.onProcessing) {
                    callbacks.onProcessing(data.message || "Processing...");
                }

                if (retries >= MAX_RETRIES) {
                    const timeoutMsg = `Timeout: Backend exceeded ${MAX_RETRIES * 500 / 1000}s. Please try again.`;
                    if (callbacks.onError) callbacks.onError(timeoutMsg);
                    return;
                }

                setTimeout(() => this.pollStatus(taskId, callbacks, retries + 1), 100);
            } 
            else if (data.status === "success") {
                // 如果后端返回的是绝对路径或 data: 开头，直接使用；否则拼接 API_BASE_URL
                let finalImageUrl = data.image;
                if (finalImageUrl && !finalImageUrl.startsWith('data:') && !finalImageUrl.startsWith('http')) {
                    finalImageUrl = `${API_BASE_URL}${finalImageUrl}`;
                }
                if (callbacks.onSuccess) callbacks.onSuccess(finalImageUrl, data.seed, data.metrics, data.filename); 
            } 
            else if (data.status === "error") {
                if (callbacks.onError) callbacks.onError(data.message);
            }
            else if (data.status === "not_found") {
                if (callbacks.onError) callbacks.onError("Task not found (backend may have restarted).");
            }
        } catch (error) {
            if (callbacks.onError) callbacks.onError(error.message);
        }
    },
};

// ==========================================================================
// 🧠 Global State & Utilities
// ==========================================================================
let generateStartTime = 0;
let currentStageStartTime = 0;
let currentStageName = "";
let isInitializing = false;
let shouldAnimateNextRender = false;

let globalModelData = {};
let currentGalleryData = [];
let renderedCount = 0;
const BATCH_SIZE = 20;
let selectedLora = "";
let backendState = { isReady: false, isChecking: false, healthInterval: null };

const ANIM_CONFIG = {
    startY: 24,        
    stiffness: 280,    
    damping: 0.7,     
    staggerDelay: 30,  
  
};

function toUnicodeBold(str) {
    return str.split('').map(char => {
        const code = char.charCodeAt(0);
        if (code >= 65 && code <= 90) return String.fromCodePoint(0x1D5D4 + (code - 65));
        if (code >= 97 && code <= 122) return String.fromCodePoint(0x1D5EE + (code - 97));
        if (code >= 48 && code <= 57) return String.fromCodePoint(0x1D7EC + (code - 48));
        return char;
    }).join('');
}

function bindSlider(sliderId, inputId) {
    const slider = document.getElementById(sliderId);
    const input = document.getElementById(inputId);
    slider.addEventListener('input', (e) => { input.value = e.target.value; });
    input.addEventListener('input', (e) => {
        let val = parseFloat(e.target.value);
        if(val < parseFloat(slider.min)) val = slider.min;
        if(val > parseFloat(slider.max)) val = slider.max;
        slider.value = val;
    });
}

bindSlider('width-slider', 'width-input');
bindSlider('height-slider', 'height-input');
bindSlider('steps-slider', 'steps-input');
bindSlider('cfg-slider', 'cfg-input');

const RATIO_PRESETS = {
    "1:1":  { w: 1024, h: 1024 },
    "3:4":  { w: 888,  h: 1184 },
    "9:16": { w: 768,  h: 1368 },
    "4:3":  { w: 1184, h: 888 },
    "16:9": { w: 1368, h: 768 }
};

document.querySelectorAll('.ratio-btn').forEach(btn => {
    btn.addEventListener('click', () => {
        document.querySelectorAll('.ratio-btn').forEach(b => b.classList.remove('active'));
        btn.classList.add('active');

        const ratio = btn.dataset.ratio;
        const preset = RATIO_PRESETS[ratio];
        if (preset) {
            document.getElementById('width-slider').value = preset.w;
            document.getElementById('width-input').value = preset.w;
            document.getElementById('height-slider').value = preset.h;
            document.getElementById('height-input').value = preset.h;
        }
    });
});

function clearActiveRatio() {
    document.querySelectorAll('.ratio-btn').forEach(b => b.classList.remove('active'));
}

document.getElementById('width-slider').addEventListener('input', clearActiveRatio);
document.getElementById('width-input').addEventListener('input', clearActiveRatio);
document.getElementById('height-slider').addEventListener('input', clearActiveRatio);
document.getElementById('height-input').addEventListener('input', clearActiveRatio);

function setUIState(isGenerating) {
    const btn = document.getElementById('generate-btn');
    if (!backendState.isReady) {
        btn.disabled = true;
        btn.innerText = "⏳ Waiting for Backend...";
    } else if (isGenerating) {
        btn.disabled = true;
        btn.innerText = "⏳ Generating...";
    } else {
        btn.disabled = false;
        btn.innerText = "Generate";
    }
}

// 获取 Checkbox 元素
const autoScrollToggle = document.getElementById('auto-scroll-toggle');

function smartScroll() {
    // 只有用户勾选了“自动滚动”，才强制贴底
    if (autoScrollToggle && autoScrollToggle.checked) {
        const logContent = document.getElementById('log-content');
        // 用 requestAnimationFrame 确保在 DOM 高度更新后再执行滚动
        requestAnimationFrame(() => {
            logContent.scrollTop = logContent.scrollHeight;
        });
    }
}

function addLog(message, type = "normal") {
    const logContent = document.getElementById('log-content');
    
    const newLine = document.createElement('div');
    newLine.className = `log-line ${type === "normal" ? "" : type}`; 
    
    const time = new Date().toLocaleTimeString('en-US', { hour12: false });
    newLine.innerText = `[${time}] ${message}`;
    logContent.appendChild(newLine);

    if (logContent.childElementCount > 100) {
        logContent.firstElementChild.remove();
    }
    
    // 插入后调用智能滚动
    smartScroll();
}

// ==========================================================================
// 💓 Health Check & Initialization
// ==========================================================================
async function performHealthCheck() {
    if (backendState.isChecking) return;
    backendState.isChecking = true;

    const dot = document.getElementById('backend-status-dot');
    const wrapper = document.getElementById('backend-status-wrapper');
    
    if (!backendState.isReady) {
        setUIState(false);
        dot.className = "status-dot loading";
        wrapper.title = "Connecting to backend...";
    }

    const isHealthy = await BackendAPI.checkHealth();
    
    if (isHealthy) {
        if (!backendState.isReady) {
            backendState.isReady = true;
            setUIState(false);
            dot.className = "status-dot online";
            wrapper.title = "Backend online, ready to generate!";
            await loadInitialData();
        }
    } else {
        backendState.isReady = false;
        setUIState(false);
        dot.className = "status-dot offline";
        wrapper.title = "Backend offline, trying to reconnect...";
    }
    backendState.isChecking = false;
}

function startHealthPolling() {
    if (backendState.healthInterval) return;
    backendState.healthInterval = setInterval(async () => {
        if (backendState.isReady) {
            clearInterval(backendState.healthInterval);
            backendState.healthInterval = null;
            return;
        }
        await performHealthCheck();
    }, 3000);
}

async function loadInitialData() {
    if (isInitializing) return;
    isInitializing = true;

    console.log("🟢 [Init] 开始初始化...");
    document.getElementById('unet-select').disabled = true;
    
    const config = await BackendAPI.getConfig();
    if (!config) console.error("❌ 获取配置失败，请检查后端 API 是否正常");
    
    const finalSamplers = config?.samplers || ["euler", "euler_ancestral", "euler_a", "dpmpp_2m", "dpmpp_2m_sde", "dpmpp_sde", "heun", "lms", "lcm"];
    const finalSchedulers = config?.schedulers || ["simple", "beta", "normal", "karras", "exponential", "sgm_uniform"];
    const rootMapping = config?.root_mapping || {};

    if (config && config.default_prompt) {
        document.getElementById('prompt').value = config.default_prompt;
    }

    document.getElementById('sampler').innerHTML = finalSamplers.map(s => `<option value="${s}">${s}</option>`).join('');
    document.getElementById('scheduler').innerHTML = finalSchedulers.map(s => `<option value="${s}">${s}</option>`).join('');

    const selectEl = document.getElementById('unet-select');
    try {
        const data = await BackendAPI.getModels();
        console.log("🟢 [Init] Models 数据已拉取");
        
        if (data.models) {
            globalModelData = data.models;
            selectEl.innerHTML = "";
            Object.keys(data.models).forEach(modelName => {
                const opt = document.createElement("option");
                opt.value = modelName; 

                if (modelName.includes(" | ")) {
                    const parts = modelName.split(" | ");
                    const enginePart = toUnicodeBold(parts[0]);
                    const modelPart = parts[1];
                    opt.textContent = `${enginePart} | ${modelPart}`;
                } else {
                    opt.textContent = toUnicodeBold(modelName);
                }
                selectEl.appendChild(opt);
            });

            let modelParam = null;
            let loraParam = null;

            if (window.location.hash) {
                const hashStr = window.location.hash.substring(1);
                const hashParams = new URLSearchParams(hashStr);
                modelParam = hashParams.get('model');
                loraParam = hashParams.get('lora');
            }

            if (!modelParam) {
                const urlParams = new URLSearchParams(window.location.search);
                modelParam = urlParams.get('model');
                loraParam = urlParams.get('lora');
            }

            let targetModel = Object.keys(data.models)[0];

            if (modelParam) {
                const targetEngine = rootMapping[modelParam] || modelParam;
                console.log(`🔗 URL解析: ${modelParam} -> ${targetEngine}`);
                for (const key of Object.keys(data.models)) {
                    const modelEngine = data.models[key].engine;
                    if (modelEngine === targetEngine) {
                        targetModel = key;
                        console.log(`✅ 成功匹配到模型: ${key} (Engine: ${modelEngine})`);
                        break;
                    }
                }
            }

            console.log(`🟢 [Init] 准备选中模型: ${targetModel}`);
            selectEl.value = targetModel;
            window._currentSelectedModel = targetModel;
            window._lastUsedArchitecture = globalModelData[targetModel]?.engine || "unknown";
            
            const modelDefaults = globalModelData[targetModel]?.defaults || {};

            if (globalModelData[targetModel]?.default_prompt !== undefined) {
                document.getElementById('prompt').value = globalModelData[targetModel].default_prompt;
            }

            if (modelDefaults.cfg !== undefined) {
                document.getElementById('cfg-slider').value = modelDefaults.cfg;
                document.getElementById('cfg-input').value = Number(modelDefaults.cfg).toFixed(1); 
            }
            if (modelDefaults.steps !== undefined) {
                document.getElementById('steps-slider').value = modelDefaults.steps;
                document.getElementById('steps-input').value = modelDefaults.steps;
            }
            if (modelDefaults.sampler !== undefined) document.getElementById('sampler').value = modelDefaults.sampler;
            if (modelDefaults.scheduler !== undefined) document.getElementById('scheduler').value = modelDefaults.scheduler;

            if (modelDefaults.char_lora_strength !== undefined) {
                document.getElementById('char-strength').value = Number(modelDefaults.char_lora_strength).toFixed(1);
            }

            selectedLora = "";
            document.getElementById('selected-lora-name').innerText = "None";
            document.getElementById('selected-lora-name').style.color = 'var(--text-muted)';
            const bigImg = document.getElementById('selected-lora-big-img');
            const placeholder = document.getElementById('preview-placeholder');
            bigImg.src = "";
            bigImg.style.display = 'none';
            placeholder.style.display = 'flex';
            document.querySelectorAll('.lora-card').forEach(c => c.classList.remove('selected'));

            renderBaseLoras(targetModel);

            window._isDataReady = true;
            // 🌟 核心修改：如果 URL 没有指定 lora 参数，说明是普通进入，开启动画
            const isPlainEntry = !loraParam; 
            await fetchAndRenderGallery(targetModel, isPlainEntry); 

            if (loraParam) {
                if (!loraParam.endsWith(".safetensors")) {
                    console.warn(`⚠️ [Init] 忽略无效的 LoRA 参数（缺少 .safetensors 后缀）: ${loraParam}`);
                } else {
                    const targetIndex = currentGalleryData.findIndex(item => item.filename === loraParam);
                    
                    if (targetIndex !== -1) {
                        const targetItem = currentGalleryData[targetIndex];
                        console.log(`🟢 [Init] 数据层成功找到 LoRA: ${loraParam}，位于第 ${targetIndex + 1} 个`);
                        
                        selectedLora = targetItem.filename;
                        const nameEl = document.getElementById('selected-lora-name');
                        nameEl.innerText = targetItem.title;
                        nameEl.style.color = 'var(--accent)';
                        
                        const bigImg = document.getElementById('selected-lora-big-img');
                        const placeholder = document.getElementById('preview-placeholder');
                        const previewWrapper = document.querySelector('.preview-wrapper'); 

                        if (previewWrapper) previewWrapper.classList.add('shimmer-container');

                        bigImg.src = targetItem.webp; 

                        bigImg.onload = () => {
                            bigImg.style.display = 'block'; 
                            placeholder.style.display = 'none';
                            if (previewWrapper) previewWrapper.classList.remove('shimmer-container');
                            bigImg.onload = null;
                        };

                        bigImg.onerror = () => {
                            if (previewWrapper) previewWrapper.classList.remove('shimmer-container');
                            bigImg.onerror = null;
                        };

                        if (targetIndex >= renderedCount) {
                            const requiredRenderCount = Math.ceil((targetIndex + 1) / BATCH_SIZE) * BATCH_SIZE;
                            const tempData = currentGalleryData.slice(renderedCount, requiredRenderCount);
                            
                            const grid = document.getElementById('gallery-grid');
                            tempData.forEach(item => {
                                const card = document.createElement('div');
                                card.className = 'lora-card';
                                card.dataset.filename = item.filename;
                                card.innerHTML = `
                                    <img src="${item.webp}" loading="lazy" alt="${item.title}" onerror="this.src='https://via.placeholder.com/300x400?text=No+Image'">
                                    <div class="card-info">
                                        <div class="card-title">${item.title}</div>
                                    </div>
                                `;
                                
                                const cardImg = card.querySelector('img');
                                applyCardShimmer(card, cardImg);
                                bindCardClick(card, item); 
                                grid.appendChild(card);
                            });
                            renderedCount = requiredRenderCount;
                        }

                        setTimeout(() => {
                            const targetCard = document.querySelector(`.lora-card[data-filename="${loraParam}"]`);
                            if (targetCard) {
                                console.log(`🟢 [Init] DOM 已渲染，执行滚动和高亮`);
                                document.querySelectorAll('.lora-card').forEach(c => c.classList.remove('selected'));
                                targetCard.classList.add('selected');
                                targetCard.scrollIntoView({ behavior: 'smooth', block: 'center' });
                            } else {
                                console.warn(`⚠️ 极度异常：数据存在，但强制渲染后依然找不到 DOM`);
                            }
                        }, 150); 

                    } else {
                        console.warn(`⚠️ [Init] 在返回的数据中不存在该 LoRA: ${loraParam}`);
                    }
                }
            }
        }
    } catch (e) {
        console.error("❌ 初始化加载失败:", e);
        selectEl.innerHTML = `<option value="">🔴 Backend Offline</option>`;
    } finally {
        document.getElementById('unet-select').disabled = false;
    
        // 🌟 智能移除遮罩：如果数据没就绪，就等它就绪
        const waitForDataAndHideMask = setInterval(() => {
            if (window._isDataReady) {
                clearInterval(waitForDataAndHideMask);
                
                const mask = document.getElementById('global-loading-mask');
                if (mask) {
                    setTimeout(() => {
                        mask.style.opacity = '0';
                        setTimeout(() => mask.remove(), 300);
                    }, 100); // 给 DOM 留 100ms 的渲染时间
                }
            }
        }, 100);
    }
}

// ==========================================================================
// 🖼️ Gallery & Card Rendering
// ==========================================================================
function renderBaseLoras(selectedModel) {
    const container = document.getElementById('base-lora-container');
    container.innerHTML = ""; 
    const loras = globalModelData[selectedModel]?.base_loras || [];
    if (loras.length === 0) {
        container.innerHTML = `<div style="font-size: 12px; color: var(--text-muted);">No Base LoRA for current model</div>`;
        return;
    }
    loras.forEach((lora) => {
        const div = document.createElement('div');
        div.className = 'lora-row';
        div.innerHTML = `
            <label>
                <input type="checkbox" class="base-lora-cb" ${lora.defaultEnable ? 'checked' : ''}>
                ${lora.name}
            </label>
            <input type="number" class="strength-box base-lora-strength" value="1.0" step="0.05" title="Strength">
        `;
        container.appendChild(div);
    });
}

// 在全局变量区加一个请求锁
let isGalleryFetching = false;

async function fetchAndRenderGallery(modelName, triggerAnim = false) {
    // 🌟 核心修复 2：如果已经在请求中，直接锁死，不准并发
    if (isGalleryFetching) {
        console.log("⚠️ 拦截并发请求，当前图库正在加载中...");
        return;
    }
    isGalleryFetching = true;

    const grid = document.getElementById('gallery-grid');
    const countEl = document.getElementById('lora-count');
    
    // 🌟 注意：这里不再清空 grid.innerHTML，因为我们在 unet-select 里已经清空了
    // 但为了首次加载的安全，如果 grid 里没有 Loading 提示，还是补一个
    if (!grid.innerHTML.includes("Loading") && !grid.innerHTML.includes("Switching")) {
        grid.innerHTML = `<div style="color: var(--text-muted); font-size: 13px; grid-column: span 4;">⏳ Loading character list...</div>`;
    }

    try {
        const modelInfo = globalModelData[modelName];
        
        if (!modelInfo || !modelInfo.engine) {
            grid.innerHTML = `<div style="color: var(--text-muted); font-size: 13px; grid-column: span 4;">⏳ Backend data syncing...</div>`;
            return;
        }

        const engineKey = modelInfo.engine;
        // 🌟 别忘了你之前给 getLoras 加了 10 秒超时
        const data = await BackendAPI.getLoras(); 
        
        const lorasDict = data.loras || {};
        const lorasForModel = lorasDict[engineKey];

        if (!lorasForModel || Object.keys(lorasForModel).length === 0) {
            grid.innerHTML = `<div style="color: var(--text-muted); font-size: 13px; grid-column: span 4;">No character LoRA for this model</div>`;
            if (countEl) countEl.innerText = "0 Models";
            return;
        }

        currentGalleryData = Object.entries(lorasForModel).map(([filename, info]) => ({
            filename: filename,
            title: filename.replace(".safetensors", ""), 
            webp: info.webp
        }));
        
        renderedCount = 0;
        shouldAnimateNextRender = triggerAnim; 

        if (countEl) countEl.innerText = `${currentGalleryData.length} Models`;
        
        // 🌟 核心：把 flex 居中还原成原来的网格布局
        grid.style.display = 'grid';
        grid.style.height = 'auto';
        
        grid.innerHTML = ""; 
        loadMoreCards();
        
        const container = document.getElementById('gallery-container');
        container.onscroll = () => {
            if (container.scrollTop + container.clientHeight >= container.scrollHeight - 50) {
                loadMoreCards();
            }
        };
    } catch (error) {
        console.error("Severe error in gallery request:", error);
        grid.innerHTML = `<div style="color: #ff4444; font-size: 13px; grid-column: span 4;">❌ Failed to load gallery, backend may be restarting</div>`;
        if (countEl) countEl.innerText = "Error";
    } finally {
        // 🌟 核心修复 3：无论成功失败，必须释放锁
        isGalleryFetching = false;
    }
}

function applyCardShimmer(card, imgElement) {
    const overlay = document.createElement('div');
    overlay.className = 'shimmer-overlay';
    card.appendChild(overlay);

    const removeShimmer = () => overlay.remove();
    
    if (imgElement.complete) {
        setTimeout(removeShimmer, 400);
    } else {
        imgElement.addEventListener('load', removeShimmer);
        imgElement.addEventListener('error', removeShimmer);
    }
}

function bindCardClick(card, item) {
    card.addEventListener('click', () => {
        document.querySelectorAll('.lora-card').forEach(c => c.classList.remove('selected'));
        card.classList.add('selected');
        selectedLora = item.filename;

        const nameEl = document.getElementById('selected-lora-name');
        nameEl.innerText = item.title;
        nameEl.style.color = item.title ? 'var(--accent)' : 'var(--text-muted)';
        
        const bigImg = document.getElementById('selected-lora-big-img');
        const placeholder = document.getElementById('preview-placeholder');
        
        bigImg.style.display = 'none';
        placeholder.style.display = 'flex'; 
        bigImg.classList.add('shimmer-active');
        bigImg.src = item.webp;

        bigImg.onload = () => {
            bigImg.style.display = 'block';
            placeholder.style.display = 'none';
            bigImg.onload = null;
        };

        bigImg.onerror = () => {
            bigImg.style.display = 'none';
            placeholder.style.display = 'flex';
            bigImg.onerror = null;
        };

        setTimeout(() => {
            bigImg.classList.remove('shimmer-active');
        }, 400); 
    });
}

function loadMoreCards() {
    const grid = document.getElementById('gallery-grid');
    const nextBatch = currentGalleryData.slice(renderedCount, renderedCount + BATCH_SIZE);
    if (nextBatch.length === 0) return;

    // 🌟 注意这里要加 (item, index)
    nextBatch.forEach((item, index) => {
        const card = document.createElement('div');
        card.className = 'lora-card';
        card.dataset.filename = item.filename;
        
        // 🌟 动画初始状态
        if (shouldAnimateNextRender) {
            card.style.opacity = '0';
            card.style.transform = 'translateY(20px)';
            card.dataset.animateEntry = "true";
            card.dataset.index = index; 
        }
        
        card.innerHTML = `
            <img src="${item.webp}" loading="lazy" alt="${item.title}" onerror="this.src='https://via.placeholder.com/300x400?text=No+Image'">
            <div class="card-info">
                <div class="card-title">${item.title}</div>
            </div>
        `;
        
        const cardImg = card.querySelector('img');
        applyCardShimmer(card, cardImg);
        bindCardClick(card, item);
        
        grid.appendChild(card);

        // 🌟 动画执行
        if (shouldAnimateNextRender) {
            // 错开延迟触发，利用你配置里的 staggerDelay (30ms)
            setTimeout(() => {
                applySpringAnimation(card);
            }, index * ANIM_CONFIG.staggerDelay);
        }
    });
    
    renderedCount += nextBatch.length;
    
    // 🌟 重要：动画只管第一屏。渲染完之后立刻关掉，防止滚动加载时还会闪烁。
    shouldAnimateNextRender = false; 

}

// ==========================================
// 🪄 Animation: 物理弹簧动画
// ==========================================
function applySpringAnimation(element) {
    if (!element || element.dataset.animating === 'true') return;
    element.dataset.animating = 'true';
  
    const startY = ANIM_CONFIG.startY;
    const omega0 = Math.sqrt(ANIM_CONFIG.stiffness); 
    const zeta = ANIM_CONFIG.damping;                
    const omegaD = omega0 * Math.sqrt(1 - zeta * zeta);
    const startTime = performance.now();
    
    element.style.transition = '';
    element.style.opacity = '0';
    element.style.transform = `translate3d(0, ${startY}px, 0)`;
    element.style.willChange = 'transform, opacity';
    element.style.backfaceVisibility = 'hidden'; 
    
    void element.offsetWidth;
  
    function step(currentTime) {
      const t = (currentTime - startTime) / 1000;
      const envelope = Math.exp(-zeta * omega0 * t);
      
      if (Math.abs(envelope * startY) < 0.1) {
        // 🌟 核心修复：不要用 translate3d，直接清空 transform，让父级彻底“干干净净”
        element.style.transform = ''; 
        element.style.opacity = 1;
        element.style.willChange = 'auto';
        element.style.transition = ''; 
        element.dataset.animating = 'false'; 
        return;
      }
      
      const positionY = startY * envelope * Math.cos(omegaD * t);
      const opacity = Math.min(t / 0.25, 1);
  
      element.style.transform = `translate3d(0, ${positionY}px, 0)`;
      element.style.opacity = opacity;
  
      requestAnimationFrame(step);
    }
    
    requestAnimationFrame(step);
}

  
// ==========================================================================
// ⚡ Event Listeners (Generate, Switch, Random Seed)
// ==========================================================================
document.getElementById('random-seed-btn').addEventListener('click', (e) => {
    e.preventDefault();
    document.getElementById('seed').value = Math.floor(Math.random() * 4294967295);
});

document.getElementById('unet-select').addEventListener('change', async (e) => {
    const selectedModel = e.target.value;
    const currentEngine = globalModelData[selectedModel]?.engine || "unknown";
    const lastEngine = window._lastUsedArchitecture || null;
    const isCrossArchitecture = (lastEngine !== null && lastEngine !== currentEngine);

    // 🌟 核心修复 1：如果是跨架构切换，第一时间强杀旧 DOM，别等网络请求
    if (isCrossArchitecture) {
        const grid = document.getElementById('gallery-grid');
        
        // 🌟 核心：强行把 grid 改成 flex 居中
        grid.style.display = 'flex';
        grid.style.justifyContent = 'center';
        grid.style.alignItems = 'center';
        grid.style.height = '100%'; // 撑满父容器高度
        
        grid.innerHTML = `<div style="color: var(--text-muted); font-size: 13px;">⏳ Loading LoRAs...</div>`;
        
        document.getElementById('lora-count').innerText = "Loading...";
        currentGalleryData = []; 
        renderedCount = 0;
    }

    // 1. 处理 Prompt 覆盖
    const promptEl = document.getElementById('prompt');
    const lastModelName = window._currentSelectedModel || null;
    const previousDefaultPrompt = lastModelName ? (globalModelData[lastModelName]?.default_prompt || "") : "";

    if (!promptEl.value.trim() || promptEl.value === previousDefaultPrompt) {
        if (globalModelData[selectedModel]?.default_prompt) {
            promptEl.value = globalModelData[selectedModel].default_prompt;
        }
    }

    // 2. 处理参数更新 (不管跨不跨架构，参数肯定要更新)
    const modelDefaults = globalModelData[selectedModel]?.defaults || {};
    
    if (modelDefaults.cfg !== undefined) {
        document.getElementById('cfg-slider').value = modelDefaults.cfg;
        document.getElementById('cfg-input').value = Number(modelDefaults.cfg).toFixed(1); 
    }
    if (modelDefaults.steps !== undefined) {
        document.getElementById('steps-slider').value = modelDefaults.steps;
        document.getElementById('steps-input').value = modelDefaults.steps;
    }
    if (modelDefaults.sampler !== undefined) {
        document.getElementById('sampler').value = modelDefaults.sampler;
    }
    if (modelDefaults.scheduler !== undefined) {
        document.getElementById('scheduler').value = modelDefaults.scheduler;
    }
    if (modelDefaults.char_lora_strength !== undefined && (isCrossArchitecture || !selectedLora)) {
        document.getElementById('char-strength').value = Number(modelDefaults.char_lora_strength).toFixed(1);
    }

    // ========================================================
    // 🌟 核心分支：只有跨架构才执行渲染，同架构直接躺平
    // ========================================================
    if (isCrossArchitecture) {
        // 跨架构：清空已选角色，换 Base LoRA，重新拉数据（并传 true 触发入场动画）
        selectedLora = "";
        document.getElementById('selected-lora-name').innerText = "None";
        document.getElementById('selected-lora-name').style.color = 'var(--text-muted)';
        
        const bigImg = document.getElementById('selected-lora-big-img');
        const placeholder = document.getElementById('preview-placeholder');
        bigImg.src = "";
        bigImg.style.display = 'none';
        placeholder.style.display = 'flex';
        document.querySelectorAll('.lora-card').forEach(c => c.classList.remove('selected'));

        renderBaseLoras(selectedModel);
        fetchAndRenderGallery(selectedModel, true); // 👈 后台异步加载，不阻塞事件
        
        // 强制滚动到图库顶部
        const galleryContainer = document.getElementById('gallery-container');
        if (galleryContainer) galleryContainer.scrollTop = 0;

    } else {
        // 🌟 同架构：不请求网络，不动画廊，完美保留 DOM 和滚动位置
        console.log("🔄 Same architecture, keeping gallery and Base LoRAs intact.");
    }

    // 更新全局记录
    window._currentSelectedModel = selectedModel;
    window._lastUsedArchitecture = currentEngine;
});

document.getElementById('generate-btn').addEventListener('click', async () => {
    if (!backendState.isReady) {
        alert("Backend is waking up. Please wait a few seconds and try again!");
        return;
    }

    const resultImage = document.getElementById('result-image');
    const placeholderText = document.getElementById('placeholder-text');
    const generateBtn = document.getElementById('generate-btn');

    const prompt = document.getElementById('prompt').value.trim();
    const unet_choice = document.getElementById('unet-select').value;
    const custom_w = parseInt(document.getElementById('width-input').value);
    const custom_h = parseInt(document.getElementById('height-input').value);
    const steps = parseInt(document.getElementById('steps-input').value);
    const cfg = parseFloat(document.getElementById('cfg-input').value);
    const sampler = document.getElementById('sampler').value;
    const scheduler = document.getElementById('scheduler').value;
    
    const seedVal = document.getElementById('seed').value;
    const seed = seedVal === "" ? -1 : parseInt(seedVal);

    if (!unet_choice || unet_choice.includes('Loading') || unet_choice.includes('Backend Offline')) { 
        alert("Please select a valid Base Model first."); return; 
    }
    
    if (!prompt) {
        alert("Please enter a prompt.");
        return;
    }

    const baseLoraStates = [];
    document.querySelectorAll('#base-lora-container .lora-row').forEach(row => {
        const isChecked = row.querySelector('.base-lora-cb').checked;
        const strength = parseFloat(row.querySelector('.base-lora-strength').value) || 1.0;
        baseLoraStates.push(isChecked, strength);
    });

    const charEnable = document.getElementById('char-enable').checked;
    const charStrength = parseFloat(document.getElementById('char-strength').value) || 1.0;
    
    const requestData = {
        prompt: prompt, 
        unet_choice: unet_choice, 
        custom_w: custom_w, 
        custom_h: custom_h, 
        steps: steps, 
        cfg: cfg, 
        seed: seed, 
        sampler: sampler, 
        scheduler: scheduler,
        char_enable: charEnable, 
        char_lora: selectedLora || "", 
        char_strength: charStrength,
        base_lora_states: baseLoraStates
    };

    console.log("🚀 Submitting parameters:", requestData);

    if (!requestData.prompt || !requestData.unet_choice || !requestData.custom_w) {
        alert("Missing parameters. Please check Prompt / Model / Dimensions.");
        return;
    }

    generateBtn.disabled = true;
    generateBtn.innerText = "⏳ Submitting...";
    resultImage.style.display = 'none';
    placeholderText.style.display = 'block';

    generateStartTime = Date.now();
    currentStageStartTime = generateStartTime;
    currentStageName = "Task Queued";

    document.getElementById('log-content').innerHTML = "";

    if (window._lastGeneratedModel !== unet_choice) {
        const currentEngine = globalModelData[unet_choice]?.engine || "unknown";
        const lastModel = window._lastGeneratedModel;
        const lastEngine = lastModel ? (globalModelData[lastModel]?.engine || "unknown") : null;

        if (lastEngine && lastEngine !== currentEngine) {
            addLog(`🔄 Arch Switch: Loading UNet/VAE/TE (Full Swap)...`, "highlight");
        } else if (lastEngine === currentEngine) {
            addLog(`🔄 Model Update: Swapping UNet (Keep VAE/TE)...`, "highlight");
        } else {
            addLog(`🔄 Initializing: Loading UNet/VAE/TE (First Load)...`, "highlight");
        }
        window._lastGeneratedModel = unet_choice; 
    }

    addLog("Task submitted to backend.", "highlight");

    try {
        const taskId = await BackendAPI.submitGenerate(requestData);
        addLog(`Task ID: ${taskId}`);
        
        BackendAPI.pollStatus(taskId, {
            onProcessing: (msg) => {
                let safeMsg = msg || "🎨 Processing...";
                let newStage = "Processing";
                
                if (safeMsg.includes("Rendering") || safeMsg.includes("steps") || safeMsg.includes("Sampling") || safeMsg.includes("KSampler")) {
                    newStage = "Comfy Backend - Sampling";
                } 
                else if (safeMsg.includes("Downloading")) {
                    newStage = "Downloading";
                }
                else if (safeMsg.includes("Requesting") || safeMsg.includes("Waiting") || safeMsg.includes("Queue")) {
                    newStage = "Queueing";
                }
                else if (safeMsg.includes("Allocating") || safeMsg.includes("GPU Acquired") || safeMsg.includes("Loading") || safeMsg.includes("Executing") || safeMsg.includes("Workflow")) {
                    newStage = "Comfy Backend - Model Loading";
                }

                if ((currentStageName === "Comfy Backend - Model Loading" || currentStageName === "Comfy Backend - Sampling") 
                    && (safeMsg.includes("Requesting") || safeMsg.includes("Waiting") || safeMsg.includes("Queue"))) {
                    return;
                }

                if (newStage !== currentStageName && newStage !== "Processing") {
                    const now = Date.now();
                    const prevDuration = ((now - currentStageStartTime) / 1000).toFixed(1);
                    
                    if (currentStageName !== "Task Queued" && currentStageName !== "Processing") {
                        addLog(`⏱️ ${currentStageName} finished in ${prevDuration}s.`);
                    }
                    
                    currentStageName = newStage;
                    currentStageStartTime = now;
                    
                    addLog(`🚀 Starting ${newStage}...`);
                }

                const logContent = document.getElementById('log-content');
                const lastLog = logContent.lastElementChild;
                const lastText = lastLog ? lastLog.innerText : "";

                if (safeMsg.includes("Rendering image (GPU processing)") && !safeMsg.includes("steps")) {
                    const elapsed = ((Date.now() - currentStageStartTime) / 1000).toFixed(0);
                    
                    const lastLine = logContent.lastElementChild ? logContent.lastElementChild.innerText : "";
                    const lastElapsedMatch = lastLine.match(/\((\d+)s\)/);
                    
                    if (!lastLine.includes("Rendering image") || !lastElapsedMatch || parseInt(lastElapsedMatch[1]) !== parseInt(elapsed)) {
                        addLog(`🎨 Rendering image (GPU processing)... (${elapsed}s)`);
                    }
                    smartScroll();
                    return;
                }

                if (safeMsg.includes("steps")) {
                    if (currentStageName !== "Comfy Backend - Sampling") {
                        const now = Date.now();
                        const prevDuration = ((now - currentStageStartTime) / 1000).toFixed(1);
                        
                        if (currentStageName === "Comfy Backend - Model Loading") {
                            addLog(`⏱️ Comfy Backend - Model Loading finished in ${prevDuration}s.`, "normal");
                            addLog(`🚀 Starting Comfy Backend - Sampling...`, "normal");
                        }
                        
                        currentStageName = "Comfy Backend - Sampling";
                        currentStageStartTime = now;
                    }

                    const lastLine = logContent.lastElementChild;
                    if (!lastLine || !lastLine.innerText.includes(safeMsg)) {
                        addLog(`\u2003\u2003${safeMsg}`, "normal");
                    }
                    smartScroll();
                    return;
                }

                if (currentStageName === "Loading VRAM" && !safeMsg.includes("Executing") && (safeMsg.includes("Waiting for GPU") || safeMsg.includes("Queue for GPU"))) {
                    return;
                }

                if (safeMsg.includes("Loading") || safeMsg.includes("Swapping") || safeMsg.includes("Waiting") || safeMsg.includes("GPU Acquired") || safeMsg.includes("Queue") || safeMsg.includes("Executing") || safeMsg.includes("Sampling") || safeMsg.includes("KSampler") || currentStageName === "Comfy Backend - Sampling") {
                    const elapsed = ((Date.now() - currentStageStartTime) / 1000).toFixed(0);
                    
                    const lastLine = logContent.lastElementChild;
                    let isNewSecond = true;
                    if (lastLine && lastLine.dataset.lastElapsed === elapsed) {
                        isNewSecond = false; 
                    }
                    
                    if (isNewSecond) {
                        const newLine = document.createElement('div');
                        newLine.className = 'log-line';
                        
                        let displayMsg = safeMsg;
                        if (currentStageName === "Comfy Backend - Model Loading") {
                            displayMsg = "📦 Loading tensors to VRAM...";
                        } else if (currentStageName === "Comfy Backend - Sampling") {
                            displayMsg = "🎨 Running KSampler...";
                        }

                        newLine.innerText = `[${new Date().toLocaleTimeString('en-US', { hour12: false })}] ${displayMsg} (Elapsed: ${elapsed}s)`;
                        newLine.dataset.lastElapsed = elapsed;
                        
                        logContent.appendChild(newLine);
                        if (logContent.childElementCount > 100) {
                            logContent.firstElementChild.remove();
                        }
                    }
                } 
                else {
                    if (!lastText.includes(safeMsg)) {
                        addLog(safeMsg);
                    }
                }
                
                smartScroll()
            },
            onSuccess: async (imageBase64, returnedSeed, metrics, filename) => {
                placeholderText.style.display = 'none';
                console.log("🚨 DEBUG METRICS:", JSON.stringify(metrics));

                // 🌟 新增：打印后端传过来的文件名
                console.log("✅ 后端返回的正确文件名:", filename);

                const now = Date.now();
                const totalDuration = ((now - generateStartTime) / 1000).toFixed(1);

                const nowForStage = Date.now();
                const prevStageDuration = ((nowForStage - currentStageStartTime) / 1000).toFixed(1);

                if (currentStageName === "Comfy Backend - Model Loading") {
                    addLog(`⏱️ Comfy Backend - Model Loading finished in ${prevStageDuration}s.`, "normal");
                    addLog(`🚀 Starting Comfy Backend - Sampling...`, "normal");
                    
                    const realSteps = metrics?.steps || "?";
                    addLog(`🎨 Rendering: ${realSteps}/${realSteps} steps (100%)`, "normal");
                    
                    const pureRender = metrics ? (metrics.workflow - metrics.load_time) : 0;
                    addLog(`⏱️ Comfy Backend - Sampling finished in ${pureRender > 0 ? pureRender.toFixed(2) : "0.0"}s.`, "normal");
                } else if (currentStageName === "Comfy Backend - Sampling") {
                    addLog(`⏱️ Comfy Backend - Sampling finished in ${prevStageDuration}s.`, "normal");
                } else if (currentStageName === "Queueing" || currentStageName === "Comfy Workflow") {
                    addLog(`⏱️ Task execution completed. Syncing final stages...`, "normal");
                }

                addLog("✅ Generation successful!", "highlight");
                addLog(`⏱️ Total Wait Time: ${totalDuration}s`, "highlight");

                if (metrics) {
                    addLog(`----------------------------------------`, "normal");
                    addLog(`📊 [Backend Precise Metrics]`, "highlight");

                    const dl = Number(metrics.download || 0);
                    const q = Number(metrics.queue || 0);
                    const wf = Number(metrics.workflow || 0);
                    const load = Number(metrics.load_time || 0);
                    
                    const pureRender = wf - load > 0 ? (wf - load) : wf;
                    const serverComputeTotal = (dl + q + wf).toFixed(2);
                    const networkOverhead = Math.max(0, totalDuration - serverComputeTotal).toFixed(1);
                    const secPerStep = pureRender > 0 && metrics.steps > 0 ? (pureRender / metrics.steps).toFixed(2) : 0;

                    const metricsLines = [
                        `\u2003\u2003⬇️ Resource Download: ${dl.toFixed(2)}s`,
                        `\u2003\u2003⏳ GPU Queue: ${q.toFixed(2)}s`,
                        load > 0 ? `\u2003\u2003📦 Model Loading: ${load.toFixed(2)}s` : null,
                        `\u2003\u2003🎨 Pure Compute (Sampler & Decode): ${pureRender.toFixed(2)}s (${metrics.steps} steps)`,
                        secPerStep > 0 ? `\u2003\u2003🚀 Average Speed: ${secPerStep}s / step` : null,
                        `\u2003\u2003🌐 Network Overhead: ~${networkOverhead}s`,
                        `\u2003\u2003⚙️ Server Compute Total: ${serverComputeTotal}s`
                    ].filter(Boolean);

                    // 启动“打字机”
                    let currentIndex = 0;
                    const typeMetrics = () => {
                        if (currentIndex < metricsLines.length) {
                            requestAnimationFrame(() => {
                                addLog(metricsLines[currentIndex], "normal");
                                smartScroll(); // 🌟 强制触发一次滚动检查
                                currentIndex++;
                                setTimeout(typeMetrics, 120);
                            });
                        } else {
                            setTimeout(() => {
                                addLog(`----------------------------------------`, "normal");
                                smartScroll(); // 🌟 收尾也滚一下
                                if (returnedSeed !== undefined && returnedSeed !== null) {
                                    addLog(`🎲 Random Seed resolved to: ${returnedSeed}`, "highlight");
                                    smartScroll(); // 🌟 Seed 出来也滚一下
                                }
                            }, 300);
                        }
                    };
                    typeMetrics();

                } else {
                    addLog(`⚠️ [Backend Metrics Missing]`, "error");
                }

                // ==========================================
                // 🌟 第三阶段：图像渲染与收尾（极简模式）
                // ==========================================
                setTimeout(() => {
                    resultImage.onload = () => {
                        resultImage.style.display = 'block';
                        setUIState(false); 
                        resultImage.onload = null;
                    };
                    
                    // 🌟 核心：因为是 URL 了，加个时间戳防止浏览器缓存旧图
                    if (imageBase64.startsWith('data:')) {
                        resultImage.src = imageBase64;
                    } else {
                        resultImage.src = `${imageBase64}?t=${Date.now()}`; 
                    }
                }, 100); 
            },
            onError: (msg) => {
                let shortMsg = msg;
                if (msg && msg.length > 60) {
                    shortMsg = msg.substring(0, 60) + "...";
                }

                placeholderText.style.display = 'block';
                placeholderText.innerText = `❌ Failed: ${shortMsg}`;
                
                setUIState(false); 
                addLog(`❌ Error: ${msg}`, "error"); 
            }
        });
    } catch (error) {
        placeholderText.style.display = 'block';
        placeholderText.innerText = `❌ Request failed: ${error.message}`;
        setUIState(false);
        addLog(`❌ Request Error: ${error.message}`, "error");
    }
});

// ==========================================================================
// 🚀 Initialization (带双重执行拦截锁)
// ==========================================================================
let isAppInitialized = false; // 🌟 全局锁

document.addEventListener("DOMContentLoaded", async () => {
    // 🌟 核心修复：如果已经初始化过了，直接 return，拦截掉第二次的幽灵执行

    if (isAppInitialized) {
        console.log("⚠️ [Init] 拦截到重复的 DOMContentLoaded，已忽略。");
        return;
    }
    isAppInitialized = true;

    
    setTimeout(() => {
        window._isDataReady = true; // 10秒后强行标记为就绪
    }, 10000);
    

    console.log("🔥 触发初始化...");
    setUIState(false);

    try {
        const isHealthy = await BackendAPI.checkHealth();
        
        if (isHealthy) {
            console.log("✅ 后端在线，开始拉取数据");
            backendState.isReady = true;
            document.getElementById('backend-status-dot').className = "status-dot online";
            setUIState(false);
            await loadInitialData();
        } else {
            console.warn("⚠️ 首次心跳失败，启动后台轮询...");
            document.getElementById('backend-status-dot').className = "status-dot offline";
            startHealthPolling();
            await loadInitialData(); 
        }
    } catch (error) {
        console.error("❌ 初始化发生严重错误:", error);
        document.getElementById('backend-status-dot').className = "status-dot offline";
        startHealthPolling();
    }
});