// 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();
      setupProductGridEsDocToggle();
      const searchInput = document.getElementById('searchInput');
      if (searchInput) {
          searchInput.focus();

      }

  }
  

  /** Delegated handler: toggle inline ES raw response under each result card (survives innerHTML refresh on re-search). */
  function setupProductGridEsDocToggle() {
      const grid = document.getElementById('productGrid');
      if (!grid || grid.dataset.esDocToggleBound === '1') {
          return;

      }

      grid.dataset.esDocToggleBound = '1';
      grid.addEventListener('click', onProductGridEsDocToggleClick);

  }
  

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

          return;
      }

      const spuId = btn.getAttribute('data-spu-id') || '';
      const tenantId = getTenantId();
      const url = `${API_BASE_URL}/search/es-doc/${encodeURIComponent(spuId)}?tenant_id=${encodeURIComponent(tenantId)}`;
  
      if (debugRoot.dataset.esInlineOpen === '1') {
          panel.setAttribute('hidden', '');
          debugRoot.classList.remove('product-debug--es-expanded');
          debugRoot.dataset.esInlineOpen = '0';
          btn.textContent = '在结果中显示 ES 文档';
          return;

      }

  
      panel.removeAttribute('hidden');
      debugRoot.classList.add('product-debug--es-expanded');
      debugRoot.dataset.esInlineOpen = '1';
      btn.textContent = '隐藏 ES 文档';
  
      if (pre.textContent.length > 0) {
          panel.scrollIntoView({ behavior: 'smooth', block: 'nearest' });
          return;
      }
  
      statusEl.style.display = '';
      statusEl.textContent = '加载中…';
      pre.style.display = 'none';
  
      try {
          const response = await fetch(url);
          if (!response.ok) {
              const errText = await response.text();
              throw new Error(`HTTP ${response.status}: ${errText.slice(0, 200)}`);
          }
          const data = await response.json();
          pre.textContent = customStringify(data);
          statusEl.style.display = 'none';
          pre.style.display = 'block';
      } catch (err) {
          console.error('ES doc fetch failed', err);
          statusEl.textContent = `加载失败: ${err.message || err}`;
          pre.style.display = 'none';
      }
  
      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('170') ? '170' : 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 response = await fetch(`${API_BASE_URL}/search/`, {
              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) {
              const esScore = typeof debug.es_score === 'number' ? debug.es_score.toFixed(4) : String(debug.es_score ?? '');
              const esNorm = typeof debug.es_score_normalized === 'number'
                  ? debug.es_score_normalized.toFixed(4)
                  : (debug.es_score_normalized == null ? '' : String(debug.es_score_normalized));
  

              const esNormRerank = typeof debug.es_score_norm === 'number'
                  ? debug.es_score_norm.toFixed(4)
                  : (debug.es_score_norm == null ? '' : String(debug.es_score_norm));
  
              const rerankScore = typeof debug.rerank_score === 'number'
                  ? debug.rerank_score.toFixed(4)
                  : (debug.rerank_score == null ? '' : String(debug.rerank_score));
  
              const fusedScore = typeof debug.fused_score === 'number'
                  ? debug.fused_score.toFixed(4)
                  : (debug.fused_score == null ? '' : String(debug.fused_score));
  

              // Build multilingual title info
              let titleLines = '';
              if (debug.title_multilingual && typeof debug.title_multilingual === 'object') {
                  Object.entries(debug.title_multilingual).forEach(([lang, val]) => {
                      if (val) {
                          titleLines += `<div class="product-debug-line">title.${escapeHtml(String(lang))}: ${escapeHtml(String(val))}</div>`;
                      }
                  });
              }
  
              const rawUrl = `${API_BASE_URL}/search/es-doc/${encodeURIComponent(spuId)}?tenant_id=${encodeURIComponent(tenantId)}`;
  
              debugHtml = `
                  <div class="product-debug">
                      <div class="product-debug-title">Ranking Debug</div>
                      <div class="product-debug-line">spu_id: ${escapeHtml(String(spuId || ''))}</div>

                      <div class="product-debug-line">ES score: ${esScore}</div>
                      <div class="product-debug-line">ES normalized: ${esNorm}</div>

                      <div class="product-debug-line">ES norm (rerank input): ${esNormRerank}</div>
                      <div class="product-debug-line">Rerank score: ${rerankScore}</div>
                      <div class="product-debug-line">Fused score: ${fusedScore}</div>

                      ${titleLines}

                      <div class="product-debug-actions">

                          <button type="button" class="product-debug-inline-es-btn"
                              data-action="toggle-es-inline-doc"
                              data-spu-id="${escapeAttr(String(spuId || ''))}">
                              在结果中显示 ES 文档

                          </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-es-doc-panel" hidden>
                          <div class="product-es-doc-panel-status"></div>
                          <pre class="product-es-doc-pre"></pre>
                      </div>

                  </div>
              `;
          }

          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>
                      
                      <div class="product-meta">
                          ${category ? escapeHtml(category) : ''}
                          ${vendor ? ' | ' + escapeHtml(vendor) : ''}
                      </div>

                  </div>

                  ${debugHtml}

              </div>
          `;
      });

      
      grid.innerHTML = html;

  }
  

  // 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>`;