// saas-search Frontend - Modern UI (Multi-Tenant)

// API 基础地址策略（优先级从高到低）：
// 1. window.API_BASE_URL：若在 HTML / 部署层显式注入，则直接使用（可为绝对 URL 或相对路径，如 "/api"）
// 2. 默认：空前缀（同源调用），由 6003 前端服务在服务端转发到本机 6002
//
// 说明：在“外网 web 服务器对 6002 另加认证”的场景下，
// 浏览器不应直接调用 web:6002，而应调用同源 web:6003/search/*，
// 再由 frontend_server.py 代理到 GPU 机本地 6002。
(function initApiBaseUrl() {
    let base;
    if (window.API_BASE_URL) {
        base = window.API_BASE_URL;
    } else {
        base = '';
    }

    window.API_BASE_URL = base;
    const apiUrlEl = document.getElementById('apiUrl');
    if (apiUrlEl) {
        apiUrlEl.textContent = base || '(same-origin)';
    }
})();

const API_BASE_URL = window.API_BASE_URL;

// Get tenant ID from select
function getTenantId() {
    const tenantSelect = document.getElementById('tenantSelect');
    if (tenantSelect) {
        return tenantSelect.value.trim();
    }
    return '';
}

// Get sku_filter_dimension (as list) from input
function getSkuFilterDimension() {
    const skuFilterInput = document.getElementById('skuFilterDimension');
    if (skuFilterInput) {
        const value = skuFilterInput.value.trim();
        if (!value.length) {
            return null;
        }
        // 支持用逗号分隔多个维度，例如：color,size 或 option1,color
        const parts = value.split(',').map(v => v.trim()).filter(v => v.length > 0);
        return parts.length > 0 ? parts : null;
    }
    return null;
}

// State Management
let state = {
    query: '',
    currentPage: 1,
    pageSize: 20,
    totalResults: 0,
    filters: {},
    rangeFilters: {},
    sortBy: '',
    sortOrder: 'desc',
    facets: null,
    lastSearchData: null,
    debug: true  // Always enable debug mode for test frontend
};

// Initialize
function initializeApp() {
    // 初始化租户下拉框和分面面板
    console.log('Initializing app...');
    initTenantSelect();
    setupProductGridResultDocToggle();
    const searchInput = document.getElementById('searchInput');
    if (searchInput) {
        searchInput.focus();
    }
}

/** Delegated handler: toggle inline current result JSON under each result card (survives innerHTML refresh on re-search). */
function setupProductGridResultDocToggle() {
    const grid = document.getElementById('productGrid');
    if (!grid || grid.dataset.resultDocToggleBound === '1') {
        return;
    }
    grid.dataset.resultDocToggleBound = '1';
    grid.addEventListener('click', onProductGridResultDocToggleClick);
}

function onProductGridResultDocToggleClick(event) {
    const btn = event.target.closest('[data-action="toggle-result-inline-doc"]');
    if (!btn) {
        return;
    }
    event.preventDefault();
    const debugRoot = btn.closest('.product-debug');
    if (!debugRoot) {
        return;
    }
    const panel = debugRoot.querySelector('.product-result-doc-panel');
    const pre = debugRoot.querySelector('.product-result-doc-pre');
    if (!panel || !pre) {
        return;
    }

    if (debugRoot.dataset.resultInlineOpen === '1') {
        panel.setAttribute('hidden', '');
        debugRoot.classList.remove('product-debug--result-expanded');
        debugRoot.dataset.resultInlineOpen = '0';
        btn.textContent = '在结果中显示当前结果数据';
        return;
    }

    panel.removeAttribute('hidden');
    debugRoot.classList.add('product-debug--result-expanded');
    debugRoot.dataset.resultInlineOpen = '1';
    btn.textContent = '隐藏当前结果数据';
    if (pre.textContent.length === 0) {
        pre.textContent = btn.getAttribute('data-result-json') || '{}';
    }
    panel.scrollIntoView({ behavior: 'smooth', block: 'nearest' });
}

// 在 DOM 加载完成后初始化
if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', initializeApp);
} else {
    // DOM 已经加载完成，直接执行
    initializeApp();
}

// 备用初始化：如果上面的初始化失败，在 window.onload 时再试一次
window.addEventListener('load', function() {
    const tenantList = document.getElementById('tenantList');
    if (tenantList && tenantList.options.length === 0) {
        console.log('Retrying tenant select initialization on window.load...');
        initTenantSelect();
    }
});

// 最后尝试：延迟执行，确保所有脚本都已加载
setTimeout(function() {
    const tenantList = document.getElementById('tenantList');
    if (tenantList && tenantList.options.length === 0) {
        console.log('Final retry: Initializing tenant select after delay...');
        if (typeof getAvailableTenantIds === 'function') {
            initTenantSelect();
        } else {
            console.error('getAvailableTenantIds still not available after delay');
        }
    }
}, 100);

// Keyboard handler
function handleKeyPress(event) {
    if (event.key === 'Enter') {
        performSearch();
    }
}

// 初始化租户输入框（带 162/170 等候选，可自行填写任意 tenant ID）
function initTenantSelect() {
    const tenantSelect = document.getElementById('tenantSelect');
    const tenantList = document.getElementById('tenantList');
    if (!tenantSelect || !tenantList) {
        console.error('tenantSelect or tenantList element not found');
        return;
    }
    
    // 检查函数是否可用
    if (typeof getAvailableTenantIds !== 'function') {
        console.error('getAvailableTenantIds function not found. Make sure tenant_facets_config.js is loaded before app.js');
        return;
    }
    
    const availableTenants = getAvailableTenantIds();
    console.log('Available tenants:', availableTenants);
    
    // 清空 datalist 现有选项
    tenantList.innerHTML = '';
    
    if (availableTenants && availableTenants.length > 0) {
        availableTenants.forEach(tenantId => {
            const option = document.createElement('option');
            option.value = tenantId;
            tenantList.appendChild(option);
        });
        // 设置默认值（仅当输入框为空时）
        if (!tenantSelect.value.trim()) {
            tenantSelect.value = availableTenants.includes('0') ? '0' : availableTenants[0];
        }
    }
    
    // 初始化分面面板
    renderFacetsPanel();
}

// 租户ID改变时的处理
function onTenantIdChange() {
    renderFacetsPanel();
    // 清空当前的分面数据
    clearFacetsData();
}

// 根据当前 tenant_id 渲染分面面板结构
function renderFacetsPanel() {
    const tenantId = getTenantId();
    const config = getTenantFacetsConfig(tenantId);
    const container = document.getElementById('specificationFacetsContainer');
    
    if (!container) return;
    
    // 清空现有规格分面
    container.innerHTML = '';
    
    // 为每个规格字段创建分面行
    config.specificationFields.forEach(specField => {
        const row = document.createElement('div');
        row.className = 'filter-row';
        row.setAttribute('data-facet-field', specField.field);
        
        row.innerHTML = `
            <div class="filter-label">${escapeHtml(specField.label)}:</div>
            <div class="filter-tags" id="${specField.containerId}"></div>
        `;
        
        container.appendChild(row);
    });
}

// 清空所有分面数据（保留结构）
function clearFacetsData() {
    const allTagContainers = document.querySelectorAll('.filter-tags');
    allTagContainers.forEach(container => {
        container.innerHTML = '';
    });
}

// Escape HTML to prevent XSS
function escapeHtml(text) {
    if (!text) return '';
    const div = document.createElement('div');
    div.textContent = text;
    return div.innerHTML;
}

// Perform search
async function performSearch(page = 1) {
    const query = document.getElementById('searchInput').value.trim();
    const tenantId = getTenantId();
    const skuFilterDimension = getSkuFilterDimension();
    
    if (!query) {
        alert('Please enter search keywords');
        return;
    }
    
    if (!tenantId) {
        alert('Please enter tenant ID');
        return;
    }
    
    state.query = query;
    state.currentPage = page;
    state.pageSize = parseInt(document.getElementById('resultSize').value);
    
    const from = (page - 1) * state.pageSize;
    
    // Define facets
    // 使用 disjunctive 控制分面行为：
    // - 类目（category1/2/3）使用标准模式（disjunctive: false），用于层级下钻
    // - 规格（color/size/material）使用 Multi-Select 模式（disjunctive: true）
    const facets = [];

    // 一级类目分面（始终存在，用于顶层类目导航）
    facets.push({
        field: "category1_name",
        size: 15,
        type: "terms",
        disjunctive: false
    });

    // 如果已选择一级类目，则在该过滤条件下请求二级类目分面
    if (state.filters.category1_name && state.filters.category1_name.length > 0) {
        facets.push({
            field: "category2_name",
            size: 15,
            type: "terms",
            disjunctive: false
        });
    }

    // 如果已选择二级类目，则在进一步过滤条件下请求三级类目分面
    if (state.filters.category2_name && state.filters.category2_name.length > 0) {
        facets.push({
            field: "category3_name",
            size: 15,
            type: "terms",
            disjunctive: false
        });
    }

    // 规格相关分面（Multi-Select 模式）
    // 根据 tenant_id 使用不同的配置
    const tenantFacetsConfig = getTenantFacetsConfig(tenantId);
    tenantFacetsConfig.specificationFields.forEach(specField => {
        // 只发送查询参数，不包含显示相关的配置（label, containerId）
        facets.push({
            field: specField.field,
            size: specField.size,
            type: specField.type,
            disjunctive: specField.disjunctive
        });
    });
    
    // Show loading
    document.getElementById('loading').style.display = 'block';
    document.getElementById('productGrid').innerHTML = '';
    
    try {
        const searchUrl = new URL(`${API_BASE_URL}/search/`, window.location.origin);
        searchUrl.searchParams.set('tenant_id', tenantId);

        const response = await fetch(searchUrl.toString(), {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json',
                'X-Tenant-ID': tenantId,
            },
            body: JSON.stringify({
                query: query,
                size: state.pageSize,
                from: from,
                filters: Object.keys(state.filters).length > 0 ? state.filters : null,
                range_filters: Object.keys(state.rangeFilters).length > 0 ? state.rangeFilters : null,
                facets: facets,
                sort_by: state.sortBy || null,
                sort_order: state.sortOrder,
                sku_filter_dimension: skuFilterDimension,
                // 测试前端始终开启后端调试信息
                debug: true
            })
        });
        
        if (!response.ok) {
            throw new Error(`HTTP ${response.status}: ${response.statusText}`);
        }
        
        const data = await response.json();
        state.lastSearchData = data;
        state.totalResults = data.total;
        state.facets = data.facets;
        
        displayResults(data);
        displayFacets(data.facets);
        displayPagination();
        displayDebugInfo(data);
        updateProductCount(data.total);
        updateClearFiltersButton();
        
    } catch (error) {
        console.error('Search error:', error);
        document.getElementById('productGrid').innerHTML = `
            <div class="error-message">
                <strong>Search Error:</strong> ${error.message}
                <br><br>
                <small>Please ensure backend service is running (${API_BASE_URL})</small>
            </div>
        `;
    } finally {
        document.getElementById('loading').style.display = 'none';
    }
}

// Display results in grid
function displayResults(data) {
    const grid = document.getElementById('productGrid');
    
    if (!data.results || data.results.length === 0) {
        grid.innerHTML = `
            <div class="no-results" style="grid-column: 1 / -1;">
                <h3>No Results Found</h3>
                <p>Try different keywords or filters</p>
            </div>
        `;
        return;
    }
    
    let html = '';

    // Build per-SPU debug lookup from debug_info.per_result (if present)
    let perResultDebugBySpu = {};
    if (state.debug && data.debug_info && Array.isArray(data.debug_info.per_result)) {
        data.debug_info.per_result.forEach((item) => {
            if (item && item.spu_id) {
                perResultDebugBySpu[String(item.spu_id)] = item;
            }
        });
    }

    const tenantId = getTenantId();

    data.results.forEach((result) => {
        const product = result;
        const title = product.title || product.name || 'N/A';
        const price = product.min_price || product.price || 'N/A';
        const imageUrl = product.image_url || product.imageUrl || '';
        const category = product.category || product.categoryName || '';
        const vendor = product.vendor || product.brandName || '';
        const spuId = product.spu_id || '';
        const debug = spuId ? perResultDebugBySpu[String(spuId)] : null;

        let debugHtml = '';
        if (debug) {
            debugHtml = buildProductDebugHtml({
                debug,
                result,
                spuId,
                tenantId,
            });
        }
        
        html += `
            <div class="product-card">
                <div class="product-main">
                    <div class="product-image-wrapper">
                        ${imageUrl ? `
                            <img src="${escapeHtml(imageUrl)}" 
                                 alt="${escapeHtml(title)}" 
                                 class="product-image"
                                 onerror="this.src='data:image/svg+xml,%3Csvg xmlns=%22http://www.w3.org/2000/svg%22 width=%22100%22 height=%22100%22%3E%3Crect fill=%22%23f0f0f0%22 width=%22100%22 height=%22100%22/%3E%3Ctext x=%2250%25%22 y=%2250%25%22 font-size=%2214%22 text-anchor=%22middle%22 dy=%22.3em%22 fill=%22%23999%22%3ENo Image%3C/text%3E%3C/svg%3E'">
                        ` : `
                            <div style="color: #ccc; font-size: 14px;">No Image</div>
                        `}
                    </div>
                    
                    <div class="product-price">
                        ${price !== 'N/A' ? `¥${price}` : 'N/A'}
                    </div>
                    
                    <div class="product-title">
                        ${escapeHtml(title)}
                    </div>
                    ${debug ? buildMultilingualFieldsHtml(debug) : ''}
                    <div class="product-meta">
                        ${category ? escapeHtml(category) : ''}
                        ${vendor ? ' | ' + escapeHtml(vendor) : ''}
                    </div>
                </div>
                ${debugHtml}
            </div>
        `;
    });
    
    grid.innerHTML = html;
}

function formatDebugNumber(value, digits = 4) {
    if (typeof value === 'number' && Number.isFinite(value)) {
        return value.toFixed(digits);
    }
    return value == null || value === '' ? 'N/A' : String(value);
}

function renderMetricList(items) {
    const lines = items
        .filter((item) => item && item.value !== undefined && item.value !== null && item.value !== '')
        .map(
            (item) => `
            <div class="debug-metric-line">
                <span class="debug-metric-k">${escapeHtml(item.label)}</span><span class="debug-metric-sep">:</span><span class="debug-metric-v">${escapeHtml(String(item.value))}</span>
            </div>
        `
        )
        .join('');
    return lines ? `<div class="debug-metrics">${lines}</div>` : '';
}

function renderScorePills(items) {
    const pills = items
        .filter((item) => item && item.value !== undefined && item.value !== null && item.value !== '')
        .map((item) => `
            <div class="debug-score-pill ${item.tone || ''}">
                <span class="debug-score-pill-label">${escapeHtml(item.label)}</span>
                <span class="debug-score-pill-value">${escapeHtml(String(item.value))}</span>
            </div>
        `)
        .join('');
    return pills ? `<div class="debug-score-pills">${pills}</div>` : '';
}

function renderJsonDetails(title, payload, open = false) {
    if (!payload || (typeof payload === 'object' && Object.keys(payload).length === 0)) {
        return '';
    }
    return `
        <details class="debug-details" ${open ? 'open' : ''}>
            <summary>${escapeHtml(title)}</summary>
            <pre class="debug-json-pre">${escapeHtml(customStringify(payload))}</pre>
        </details>
    `;
}

/** Multilingual title/brief/vendor from per-result debug; shown under image/price/title on the left. */
function buildMultilingualFieldsHtml(debug) {
    if (!debug || typeof debug !== 'object') {
        return '';
    }
    const titlePayload = {};
    if (debug.title_multilingual) titlePayload.title = debug.title_multilingual;
    if (debug.brief_multilingual) titlePayload.brief = debug.brief_multilingual;
    if (debug.vendor_multilingual) titlePayload.vendor = debug.vendor_multilingual;
    if (Object.keys(titlePayload).length === 0) {
        return '';
    }
    return `<div class="product-main-multilingual">${renderJsonDetails('Multilingual Fields', titlePayload, true)}</div>`;
}

function buildProductDebugHtml({ debug, result, spuId, tenantId }) {
    const resultJson = customStringify(result);
    const rawUrl = `${API_BASE_URL}/search/es-doc/${encodeURIComponent(spuId)}?tenant_id=${encodeURIComponent(tenantId)}`;
    const funnel = debug.ranking_funnel || {};
    const esStage = funnel.es_recall || {};
    const coarseStage = funnel.coarse_rank || {};
    const fineStage = funnel.fine_rank || {};
    const rerankStage = funnel.rerank || {};
    const finalPageStage = funnel.final_page || {};

    const rankSummary = renderMetricList([
        { label: 'Initial Rank', value: debug.initial_rank ?? 'N/A' },
        { label: 'Final Rank', value: debug.final_rank ?? 'N/A' },
        { label: 'Rank Delta', value: (debug.initial_rank && debug.final_rank) ? String(debug.initial_rank - debug.final_rank) : 'N/A' },
        { label: 'SPU', value: spuId || 'N/A' },
    ]);

    const stageScores = renderScorePills([
        { label: 'ES', value: formatDebugNumber(esStage.score ?? debug.es_score), tone: 'tone-es' },
        { label: 'ES Norm', value: formatDebugNumber(esStage.normalized_score ?? debug.es_score_normalized), tone: 'tone-neutral' },
        { label: 'Coarse', value: formatDebugNumber(coarseStage.score ?? debug.coarse_score), tone: 'tone-coarse' },
        { label: 'Fine', value: formatDebugNumber(fineStage.score ?? debug.fine_score), tone: 'tone-fine' },
        { label: 'Rerank', value: formatDebugNumber(rerankStage.rerank_score ?? debug.rerank_score), tone: 'tone-rerank' },
        { label: 'Fused', value: formatDebugNumber(rerankStage.fused_score ?? debug.fused_score), tone: 'tone-final' },
    ]);

    const stageGrid = `
        <div class="debug-stage-grid">
            ${buildStageCard('ES Recall', 'Matched queries and ES raw score', [
                { label: 'rank', value: esStage.rank ?? debug.initial_rank ?? 'N/A' },
                { label: 'es_score', value: formatDebugNumber(esStage.score ?? debug.es_score) },
                { label: 'es_norm', value: formatDebugNumber(esStage.normalized_score ?? debug.es_score_normalized) },
            ], renderJsonDetails('Matched Queries', esStage.matched_queries ?? debug.matched_queries, true))}
            ${buildStageCard('Coarse Rank', 'Text + vector fusion', [
                { label: 'rank', value: coarseStage.rank ?? 'N/A' },
                { label: 'rank_change', value: coarseStage.rank_change ?? 'N/A' },
                { label: 'coarse_score', value: formatDebugNumber(coarseStage.score ?? debug.coarse_score) },
                { label: 'text_score', value: formatDebugNumber(coarseStage.text_score ?? debug.text_score) },
                { label: 'text_source', value: formatDebugNumber(coarseStage.signals?.text_source_score ?? debug.text_source_score) },
                { label: 'text_translation', value: formatDebugNumber(coarseStage.signals?.text_translation_score ?? debug.text_translation_score) },
                { label: 'text_primary', value: formatDebugNumber(coarseStage.signals?.text_primary_score ?? debug.text_primary_score) },
                { label: 'text_support', value: formatDebugNumber(coarseStage.signals?.text_support_score ?? debug.text_support_score) },
                { label: 'knn_score', value: formatDebugNumber(coarseStage.knn_score ?? debug.knn_score) },
                { label: 'text_knn', value: formatDebugNumber(coarseStage.signals?.text_knn_score ?? debug.text_knn_score) },
                { label: 'image_knn', value: formatDebugNumber(coarseStage.signals?.image_knn_score ?? debug.image_knn_score) },
                { label: 'text_factor', value: formatDebugNumber(coarseStage.text_factor ?? debug.coarse_text_factor) },
                { label: 'knn_factor', value: formatDebugNumber(coarseStage.knn_factor ?? debug.coarse_knn_factor) },
            ], renderJsonDetails('Coarse Signals', coarseStage.signals, true))}
            ${buildStageCard('Fine Rank', 'Lightweight reranker output', [
                { label: 'rank', value: fineStage.rank ?? 'N/A' },
                { label: 'rank_change', value: fineStage.rank_change ?? 'N/A' },
                { label: 'stage_score', value: formatDebugNumber(fineStage.score ?? debug.score) },
                { label: 'fine_score', value: formatDebugNumber(fineStage.fine_score ?? debug.fine_score) },
                { label: 'text_score', value: formatDebugNumber(fineStage.text_score ?? debug.text_score) },
                { label: 'knn_score', value: formatDebugNumber(fineStage.knn_score ?? debug.knn_score) },
            ], `${renderJsonDetails('Fine Fusion', fineStage.fusion_summary || debug.fusion_summary || fineStage.fusion_factors, true)}${renderJsonDetails('Fine Input', fineStage.rerank_input ?? debug.rerank_input, true)}`)}
            ${buildStageCard('Final Rerank', 'Heavy reranker + final fusion', [
                { label: 'rank', value: rerankStage.rank ?? finalPageStage.rank ?? debug.final_rank ?? 'N/A' },
                { label: 'rank_change', value: rerankStage.rank_change ?? finalPageStage.rank_change ?? 'N/A' },
                { label: 'stage_score', value: formatDebugNumber(rerankStage.score ?? rerankStage.fused_score ?? debug.score) },
                { label: 'rerank_score', value: formatDebugNumber(rerankStage.rerank_score ?? debug.rerank_score) },
                { label: 'fine_score', value: formatDebugNumber(rerankStage.fine_score ?? debug.fine_score) },
                { label: 'text_score', value: formatDebugNumber(rerankStage.text_score ?? debug.text_score) },
                { label: 'knn_score', value: formatDebugNumber(rerankStage.knn_score ?? debug.knn_score) },
                { label: 'fine_factor', value: formatDebugNumber(rerankStage.fine_factor ?? debug.fine_factor) },
                { label: 'rerank_factor', value: formatDebugNumber(rerankStage.rerank_factor ?? debug.rerank_factor) },
                { label: 'text_factor', value: formatDebugNumber(rerankStage.text_factor ?? debug.text_factor) },
                { label: 'knn_factor', value: formatDebugNumber(rerankStage.knn_factor ?? debug.knn_factor) },
                { label: 'fused_score', value: formatDebugNumber(rerankStage.fused_score ?? debug.fused_score) },
            ], `${renderJsonDetails('Final Fusion', rerankStage.fusion_summary || debug.fusion_summary || rerankStage.fusion_factors, false)}${renderJsonDetails('Rerank Signals', rerankStage.signals, false)}`)}
        </div>
    `;

    return `
        <div class="product-debug">
            <div class="product-debug-title">Ranking Funnel</div>
            ${rankSummary}
            ${stageScores}
            ${stageGrid}
            ${renderJsonDetails('Selected SKU', debug.style_intent_sku, true)}
            <div class="product-debug-actions">
                <button type="button" class="product-debug-inline-result-btn"
                    data-action="toggle-result-inline-doc"
                    data-result-json="${escapeAttr(resultJson)}">
                    在结果中显示当前结果数据
                </button>
                <a class="product-debug-link" href="${rawUrl}" target="_blank" rel="noopener noreferrer">
                    查看 ES 原始文档
                </a>
            </div>
            <div class="product-result-doc-panel" hidden>
                <pre class="product-result-doc-pre"></pre>
            </div>
        </div>
    `;
}

// Display facets as filter tags (一级分类 + 三个属性分面)
function displayFacets(facets) {
    if (!facets || !Array.isArray(facets)) {
        return;
    }
    
    const tenantId = getTenantId();
    
    facets.forEach((facet) => {
        // 根据配置获取分面显示信息
        const displayConfig = getFacetDisplayConfig(tenantId, facet.field);
        
        if (!displayConfig) {
            // 如果没有配置，跳过该分面
            return;
        }
        
        const containerId = displayConfig.containerId;
        const maxDisplay = displayConfig.maxDisplay;
        
        const container = document.getElementById(containerId);
        if (!container) {
            return;
        }
        
        // 检查values是否存在且是数组
        if (!facet.values || !Array.isArray(facet.values) || facet.values.length === 0) {
            container.innerHTML = '';
            return;
        }
        
        let html = '';
        
        // 渲染分面值
        facet.values.slice(0, maxDisplay).forEach((facetValue) => {
            if (!facetValue || typeof facetValue !== 'object') {
                return;
            }
            
            const value = facetValue.value;
            const count = facetValue.count;
            
            // 允许value为0或空字符串，但不允许undefined/null
            if (value === undefined || value === null) {
                return;
            }
            
            // 检查是否已选中
            let selected = false;
            if (facet.field.startsWith('specifications.')) {
                // 检查specifications过滤
                const specName = facet.field.split('.')[1];
                if (state.filters.specifications) {
                    const specs = Array.isArray(state.filters.specifications) 
                        ? state.filters.specifications 
                        : [state.filters.specifications];
                    selected = specs.some(spec => spec && spec.name === specName && spec.value === value);
                }
            } else {
                // 检查普通字段过滤
                if (state.filters[facet.field]) {
                    selected = state.filters[facet.field].includes(value);
                }
            }
            
            html += `
                <span class="filter-tag ${selected ? 'active' : ''}" 
                      onclick="toggleFilter('${escapeAttr(facet.field)}', '${escapeAttr(String(value))}')">
                    ${escapeHtml(String(value))} (${count || 0})
                </span>
            `;
        });
        
        container.innerHTML = html;
    });
}

// Toggle filter (支持specifications嵌套过滤)
function toggleFilter(field, value) {
    // 处理specifications属性过滤 (specifications.color, specifications.size, specifications.material)
    if (field.startsWith('specifications.')) {
        const specName = field.split('.')[1]; // 提取name (color, size, material)
        
        // 初始化specifications过滤
        if (!state.filters.specifications) {
            state.filters.specifications = [];
        }
        
        // 确保是数组格式
        if (!Array.isArray(state.filters.specifications)) {
            // 如果已经是单个对象，转换为数组
            state.filters.specifications = [state.filters.specifications];
        }
        
        // 查找是否已存在相同的name和value组合
        const existingIndex = state.filters.specifications.findIndex(
            spec => spec.name === specName && spec.value === value
        );
        
        if (existingIndex > -1) {
            // 移除
            state.filters.specifications.splice(existingIndex, 1);
            if (state.filters.specifications.length === 0) {
                delete state.filters.specifications;
            } else if (state.filters.specifications.length === 1) {
                // 如果只剩一个，可以保持为数组，或转换为单个对象（API都支持）
                // 这里保持为数组，更一致
            }
        } else {
            // 添加
            state.filters.specifications.push({ name: specName, value: value });
        }
    } else {
        // 处理普通字段过滤 (category1_name 等)
        // 对类目字段使用互斥单选 + 层级重置逻辑
        const isCategoryField =
            field === 'category1_name' ||
            field === 'category2_name' ||
            field === 'category3_name';

        if (isCategoryField) {
            // 点击已选中的类目 -> 取消该层和以下层级
            const currentValues = state.filters[field] || [];
            const isAlreadySelected = currentValues.includes(value);

            if (isAlreadySelected) {
                delete state.filters[field];
                if (field === 'category1_name') {
                    delete state.filters.category2_name;
                    delete state.filters.category3_name;
                } else if (field === 'category2_name') {
                    delete state.filters.category3_name;
                }
            } else {
                // 选择新的类目值：该层级单选，下级全部重置
                state.filters[field] = [value];
                if (field === 'category1_name') {
                    delete state.filters.category2_name;
                    delete state.filters.category3_name;
                } else if (field === 'category2_name') {
                    delete state.filters.category3_name;
                }
            }
        } else {
            // 其他普通字段维持原有多选行为
            if (!state.filters[field]) {
                state.filters[field] = [];
            }
            
            const index = state.filters[field].indexOf(value);
            if (index > -1) {
                state.filters[field].splice(index, 1);
                if (state.filters[field].length === 0) {
                    delete state.filters[field];
                }
            } else {
                state.filters[field].push(value);
            }
        }
    }
    
    performSearch(1); // Reset to page 1
}

// Handle price filter (重构版 - 使用 rangeFilters)
function handlePriceFilter(value) {
    if (!value) {
        delete state.rangeFilters.min_price;
    } else {
        const priceRanges = {
            '0-50': { lt: 50 },
            '50-100': { gte: 50, lt: 100 },
            '100-200': { gte: 100, lt: 200 },
            '200+': { gte: 200 }
        };
        
        if (priceRanges[value]) {
            state.rangeFilters.min_price = priceRanges[value];
        }
    }
    
    performSearch(1);
}

// Handle time filter (重构版 - 使用 rangeFilters)
function handleTimeFilter(value) {
    if (!value) {
        delete state.rangeFilters.create_time;
    } else {
        const now = new Date();
        let fromDate;
        
        switch(value) {
            case 'today':
                fromDate = new Date(now.setHours(0, 0, 0, 0));
                break;
            case 'week':
                fromDate = new Date(now.setDate(now.getDate() - 7));
                break;
            case 'month':
                fromDate = new Date(now.setMonth(now.getMonth() - 1));
                break;
            case '3months':
                fromDate = new Date(now.setMonth(now.getMonth() - 3));
                break;
            case '6months':
                fromDate = new Date(now.setMonth(now.getMonth() - 6));
                break;
        }
        
        if (fromDate) {
            state.rangeFilters.create_time = {
                gte: fromDate.toISOString()
            };
        }
    }
    
    performSearch(1);
}

// Clear all filters
function clearAllFilters() {
    state.filters = {};
    state.rangeFilters = {};
    document.getElementById('priceFilter').value = '';
    document.getElementById('timeFilter').value = '';
    performSearch(1);
}

// Update clear filters button visibility
function updateClearFiltersButton() {
    const btn = document.getElementById('clearFiltersBtn');
    if (Object.keys(state.filters).length > 0 || Object.keys(state.rangeFilters).length > 0) {
        btn.style.display = 'inline-block';
    } else {
        btn.style.display = 'none';
    }
}

// Update product count
function updateProductCount(total) {
    document.getElementById('productCount').textContent = `${total.toLocaleString()} SPUs found`;
}

// Sort functions
function setSortByDefault() {
    // Remove active from all buttons and arrows
    document.querySelectorAll('.sort-btn').forEach(b => b.classList.remove('active'));
    document.querySelectorAll('.arrow-up, .arrow-down').forEach(a => a.classList.remove('active'));
    
    // Set default button active
    const defaultBtn = document.querySelector('.sort-btn[data-sort=""]');
    if (defaultBtn) defaultBtn.classList.add('active');
    
    state.sortBy = '';
    state.sortOrder = 'desc';
    
    performSearch(1);
}

function sortByField(field, order) {
    state.sortBy = field;
    state.sortOrder = order;
    
    // Remove active from all buttons (but keep "By default" if no sort)
    document.querySelectorAll('.sort-btn').forEach(b => b.classList.remove('active'));
    
    // Remove active from all arrows
    document.querySelectorAll('.arrow-up, .arrow-down').forEach(a => a.classList.remove('active'));
    
    // Add active to clicked arrow
    const activeArrow = document.querySelector(`.arrow-up[data-field="${field}"][data-order="${order}"], .arrow-down[data-field="${field}"][data-order="${order}"]`);
    if (activeArrow) {
        activeArrow.classList.add('active');
    }
    
    performSearch(state.currentPage);
}

// Pagination
function displayPagination() {
    const paginationDiv = document.getElementById('pagination');
    
    if (state.totalResults <= state.pageSize) {
        paginationDiv.style.display = 'none';
        return;
    }
    
    paginationDiv.style.display = 'flex';
    
    const totalPages = Math.ceil(state.totalResults / state.pageSize);
    const currentPage = state.currentPage;
    
    let html = `
        <button class="page-btn" onclick="goToPage(${currentPage - 1})" 
                ${currentPage === 1 ? 'disabled' : ''}>
            ← Previous
        </button>
    `;
    
    // Page numbers
    const maxVisible = 5;
    let startPage = Math.max(1, currentPage - Math.floor(maxVisible / 2));
    let endPage = Math.min(totalPages, startPage + maxVisible - 1);
    
    if (endPage - startPage < maxVisible - 1) {
        startPage = Math.max(1, endPage - maxVisible + 1);
    }
    
    if (startPage > 1) {
        html += `<button class="page-btn" onclick="goToPage(1)">1</button>`;
        if (startPage > 2) {
            html += `<span class="page-info">...</span>`;
        }
    }
    
    for (let i = startPage; i <= endPage; i++) {
        html += `
            <button class="page-btn ${i === currentPage ? 'active' : ''}" 
                    onclick="goToPage(${i})">
                ${i}
            </button>
        `;
    }
    
    if (endPage < totalPages) {
        if (endPage < totalPages - 1) {
            html += `<span class="page-info">...</span>`;
        }
        html += `<button class="page-btn" onclick="goToPage(${totalPages})">${totalPages}</button>`;
    }
    
    html += `
        <button class="page-btn" onclick="goToPage(${currentPage + 1})" 
                ${currentPage === totalPages ? 'disabled' : ''}>
            Next →
        </button>
    `;
    
    html += `
        <span class="page-info">
            Page ${currentPage} of ${totalPages} (${state.totalResults.toLocaleString()} results)
        </span>
    `;
    
    paginationDiv.innerHTML = html;
}

function goToPage(page) {
    const totalPages = Math.ceil(state.totalResults / state.pageSize);
    if (page < 1 || page > totalPages) return;
    
    performSearch(page);
    
    // Scroll to top
    window.scrollTo({ top: 0, behavior: 'smooth' });
}

/** Query-analysis intent block: dimensions, matched surface form, canonical value, source query variant. */
function formatIntentDetectionHtml(intent) {
    const profile = intent || null;
    let block = '<div style="margin-top: 10px;"><strong style="font-size: 13px;">intent_detection:</strong></div>';
    if (!profile || typeof profile !== 'object') {
        block += '<div>(no intent payload — style intent may be disabled or context missing)</div>';
        return block;
    }
    const active = !!profile.active;
    block += `<div>active: ${active ? 'yes' : 'no'}</div>`;
    const intents = Array.isArray(profile.intents) ? profile.intents : [];
    if (!intents.length) {
        block += '<div>intents: (none — no vocabulary match on query variants)</div>';
        return block;
    }
    block += '<div style="margin-top: 4px;">intents:</div><ul style="margin: 4px 0 8px 20px; padding: 0;">';
    for (const it of intents) {
        const aliases = Array.isArray(it.dimension_aliases) ? it.dimension_aliases.join(', ') : '';
        block += '<li style="margin-bottom: 6px;">';
        block += `<div><strong>intent_type</strong>: ${escapeHtml(it.intent_type || '')}</div>`;
        block += `<div><strong>dimension_aliases</strong>: ${escapeHtml(aliases || 'N/A')}</div>`;
        block += `<div><strong>matched_term</strong>: ${escapeHtml(it.matched_term || '')}</div>`;
        block += `<div><strong>canonical_value</strong>: ${escapeHtml(it.canonical_value || '')}</div>`;
        block += `<div><strong>matched_query_text</strong>: ${escapeHtml(it.matched_query_text || '')}</div>`;
        block += '</li>';
    }
    block += '</ul>';
    if (Array.isArray(profile.query_variants) && profile.query_variants.length > 0) {
        block += '<div style="margin-top: 6px;"><strong>query_variants</strong>:</div>';
        block += `<pre style="background: #f5f5f5; padding: 8px; overflow: auto; max-height: 200px; margin-top: 4px;">${escapeHtml(customStringify(profile.query_variants))}</pre>`;
    }
    return block;
}

function buildStageCard(title, subtitle, metrics, extraHtml = '') {
    return `
        <div class="debug-stage-card">
            <div class="debug-stage-title">${escapeHtml(title)}</div>
            ${subtitle ? `<div class="debug-stage-subtitle">${escapeHtml(subtitle)}</div>` : ''}
            ${renderMetricList(metrics)}
            ${extraHtml}
        </div>
    `;
}

function renderTimingBars(stageTimings) {
    if (!stageTimings || typeof stageTimings !== 'object') {
        return '';
    }
    const orderedStages = [
        'query_parsing',
        'query_building',
        'elasticsearch_search_primary',
        'coarse_ranking',
        'style_sku_prepare_hits',
        'fine_ranking',
        'reranking',
        'elasticsearch_page_fill',
        'result_processing',
        'total_search',
    ];
    const entries = Object.entries(stageTimings)
        .sort((a, b) => {
            const ai = orderedStages.indexOf(a[0]);
            const bi = orderedStages.indexOf(b[0]);
            return (ai === -1 ? 999 : ai) - (bi === -1 ? 999 : bi);
        });
    const total = Number(stageTimings.total_search || 0);
    return `
        <div class="debug-timing-list">
            ${entries.map(([stage, duration]) => {
                const numeric = Number(duration) || 0;
                const width = total > 0 ? Math.max(2, Math.round((numeric / total) * 100)) : 2;
                return `
                    <div class="debug-timing-row">
                        <div class="debug-timing-label">${escapeHtml(stage)}</div>
                        <div class="debug-timing-bar-wrap"><div class="debug-timing-bar" style="width:${width}%"></div></div>
                        <div class="debug-timing-value">${numeric.toFixed(2)}ms</div>
                    </div>
                `;
            }).join('')}
        </div>
    `;
}

function buildGlobalFunnelHtml(data, debugInfo) {
    const queryAnalysis = debugInfo.query_analysis || {};
    const searchParams = debugInfo.search_params || {};
    const featureFlags = debugInfo.feature_flags || {};
    const esResponse = debugInfo.es_response || {};
    const esQueryContext = debugInfo.es_query_context || {};
    const rankingFunnel = debugInfo.ranking_funnel || {};
    const coarseInfo = rankingFunnel.coarse_rank || debugInfo.coarse_rank || {};
    const fineInfo = rankingFunnel.fine_rank || debugInfo.fine_rank || {};
    const rerankInfo = rankingFunnel.rerank || debugInfo.rerank || {};
    const translations = queryAnalysis.translations || {};
    const keywordsQueries = queryAnalysis.keywords_queries || {};

    const summaryHtml = `
        <div class="debug-section-block">
            <div class="debug-section-title">Query Context</div>
            ${renderMetricList([
                { label: 'original_query', value: queryAnalysis.original_query || 'N/A' },
                { label: 'rewritten_query', value: queryAnalysis.rewritten_query || 'N/A' },
                { label: 'detected_language', value: queryAnalysis.detected_language || 'N/A' },
                { label: 'index_languages', value: (queryAnalysis.index_languages || []).join(', ') || 'N/A' },
                { label: 'query_tokens', value: (queryAnalysis.query_tokens || []).join(', ') || 'N/A' },
                { label: 'base_keywords', value: keywordsQueries.base || 'N/A' },
                { label: 'translation_enabled', value: featureFlags.translation_enabled ? 'enabled' : 'disabled' },
                { label: 'embedding_enabled', value: featureFlags.embedding_enabled ? 'enabled' : 'disabled' },
                { label: 'style_intent_active', value: featureFlags.style_intent_active ? 'yes' : 'no' },
            ])}
            ${Object.keys(translations).length ? renderJsonDetails('Translations', translations, true) : ''}
            ${Object.keys(keywordsQueries).length ? renderJsonDetails('Keywords Queries', keywordsQueries, true) : ''}
            ${formatIntentDetectionHtml(queryAnalysis.intent_detection ?? queryAnalysis.style_intent_profile)}
        </div>
    `;

    const funnelHtml = `
        <div class="debug-section-block">
            <div class="debug-section-title">Ranking Funnel</div>
            <div class="debug-stage-grid">
                ${buildStageCard('ES Recall', 'First-pass retrieval', [
                    { label: 'fetch_from', value: searchParams.es_fetch_from ?? 0 },
                    { label: 'fetch_size', value: searchParams.es_fetch_size ?? 'N/A' },
                    { label: 'total_hits', value: esResponse.total_hits ?? 'N/A' },
                    { label: 'es_took_ms', value: esResponse.took_ms ?? 'N/A' },
                    { label: 'include_named_queries_score', value: esQueryContext.include_named_queries_score ? 'yes' : 'no' },
                ])}
                ${buildStageCard('Coarse Rank', 'Lexical + vector fusion only', [
                    { label: 'docs_in', value: coarseInfo.docs_in ?? searchParams.es_fetch_size ?? 'N/A' },
                    { label: 'docs_out', value: coarseInfo.docs_out ?? 'N/A' },
                    { label: 'formula', value: 'text x knn' },
                ], coarseInfo.fusion ? renderJsonDetails('Coarse Fusion', coarseInfo.fusion, false) : '')}
                ${buildStageCard('Fine Rank', 'Lightweight reranker', [
                    { label: 'service_url', value: fineInfo.service_url || 'N/A' },
                    { label: 'docs_in', value: fineInfo.docs_in ?? 'N/A' },
                    { label: 'docs_out', value: fineInfo.docs_out ?? fineInfo.top_n ?? 'N/A' },
                    { label: 'top_n', value: fineInfo.top_n ?? 'N/A' },
                    { label: 'backend', value: fineInfo.backend || 'N/A' },
                    { label: 'model', value: fineInfo.model || fineInfo.backend_model_name || 'N/A' },
                    { label: 'query_template', value: fineInfo.query_template || 'N/A' },
                ], fineInfo.meta ? renderJsonDetails('Fine Meta', fineInfo.meta, false) : '')}
                ${buildStageCard('Final Rerank', 'Heavy reranker + final fusion', [
                    { label: 'service_url', value: rerankInfo.service_url || 'N/A' },
                    { label: 'docs_in', value: rerankInfo.docs_in ?? 'N/A' },
                    { label: 'docs_out', value: rerankInfo.docs_out ?? 'N/A' },
                    { label: 'top_n', value: rerankInfo.top_n ?? 'N/A' },
                    { label: 'backend', value: rerankInfo.backend || 'N/A' },
                    { label: 'model', value: rerankInfo.model || rerankInfo.backend_model_name || 'N/A' },
                    { label: 'query_template', value: rerankInfo.query_template || 'N/A' },
                ], `${rerankInfo.fusion ? renderJsonDetails('Final Fusion', rerankInfo.fusion, false) : ''}${rerankInfo.meta ? renderJsonDetails('Rerank Meta', rerankInfo.meta, false) : ''}`)}
                ${buildStageCard('Page Return', 'Final slice returned to UI', [
                    { label: 'from', value: searchParams.from_ ?? 0 },
                    { label: 'size', value: searchParams.size ?? 'N/A' },
                    { label: 'returned', value: (data.results || []).length },
                    { label: 'max_score', value: formatDebugNumber(esResponse.max_score, 3) },
                ])}
            </div>
        </div>
    `;

    const timingHtml = `
        <div class="debug-section-block">
            <div class="debug-section-title">Timing Breakdown</div>
            ${renderTimingBars(debugInfo.stage_timings)}
        </div>
    `;

    const rawPayloadHtml = `
        <div class="debug-section-block">
            <div class="debug-section-title">Raw Payloads</div>
            ${renderJsonDetails('ES Query DSL', debugInfo.es_query, false)}
            ${renderJsonDetails('ES Query Context', debugInfo.es_query_context, false)}
            ${renderJsonDetails('Search Params', debugInfo.search_params, false)}
        </div>
    `;

    return `
        <div class="debug-panel">
            ${summaryHtml}
            ${funnelHtml}
            ${timingHtml}
            ${rawPayloadHtml}
        </div>
    `;
}

// Display debug info
function displayDebugInfo(data) {
    const debugInfoDiv = document.getElementById('debugInfo');

    if (!state.debug || !data.debug_info) {
        if (data.query_info) {
            debugInfoDiv.innerHTML = `
                <div class="debug-panel">
                    <div class="debug-section-block">
                        <div class="debug-section-title">Query Context</div>
                        ${renderMetricList([
                            { label: 'original_query', value: data.query_info.original_query || 'N/A' },
                            { label: 'detected_language', value: data.query_info.detected_language || 'N/A' },
                        ])}
                    </div>
                </div>
            `;
        } else {
            debugInfoDiv.innerHTML = '';
        }
        return;
    }

    debugInfoDiv.innerHTML = buildGlobalFunnelHtml(data, data.debug_info);
}

// Custom JSON stringify that compresses numeric arrays (like embeddings) to single line
function customStringify(obj) {
    return JSON.stringify(obj, (key, value) => {
        if (Array.isArray(value)) {
            // Only collapse arrays that contain numbers (like embeddings)
            if (value.every(item => typeof item === 'number')) {
                return JSON.stringify(value);
            }
        }
        return value;
    }, 2).replace(/"\[/g, '[').replace(/\]"/g, ']');
}

// Helper functions
function escapeAttr(text) {
    if (!text) return '';
    return text.replace(/'/g, "\\'").replace(/"/g, '&quot;');
}

function formatDate(dateStr) {
    if (!dateStr) return '';
    try {
        const date = new Date(dateStr);
        return date.toLocaleDateString('zh-CN');
    } catch {
        return dateStr;
    }
}