/**
 * search.js — 语义检索页
 */
const SearchPage = {
  state: { query: '', mode: 'semantic', category: '', province: '', city: '', results: [], total: 0, page: 1, pageSize: 20, loading: false, error: null },

  render() {
    const isKeyword = this.state.mode === 'keyword';
    return `
      <div class="p-4 md:p-6 max-w-5xl mx-auto">
        <h2 class="text-lg font-semibold mb-4">法规检索</h2>

        <!-- 筛选栏 -->
        <div class="bg-white rounded-xl border border-gray-200 p-4 mb-4">
          <!-- 模式切换 -->
          <div class="flex gap-2 mb-3">
            <button onclick="SearchPage.setMode('semantic')"
              class="px-3 py-1.5 text-xs rounded-lg ${!isKeyword ? 'bg-gray-900 text-white' : 'bg-gray-100 text-gray-600 hover:bg-gray-200'}">
              语义检索
            </button>
            <button onclick="SearchPage.setMode('keyword')"
              class="px-3 py-1.5 text-xs rounded-lg ${isKeyword ? 'bg-gray-900 text-white' : 'bg-gray-100 text-gray-600 hover:bg-gray-200'}">
              精确查找
            </button>
            <span class="text-xs text-gray-400 self-center ml-1">
              ${isKeyword ? '按法规名+条号精确匹配,如"郑州市劳动用工条例 第三十二条"' : '自然语言语义搜索,如"加班工资计算基数"'}
            </span>
          </div>
          <div class="flex gap-3 mb-3">
            <input id="search-input" type="text"
              placeholder="${isKeyword ? '输入法规名和条号,如:郑州市劳动用工条例 第三十二条' : '输入查询,如:个人信息保护、竞业协议补偿金...'}"
              class="flex-1 rounded-lg border border-gray-200 px-3 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-gray-900"
              value="${this.state.query}" maxlength="1000"
              onkeydown="if(event.key==='Enter')SearchPage.doSearch()">
            <button onclick="SearchPage.doSearch()" class="px-4 py-2 bg-gray-900 text-white text-sm rounded-lg hover:bg-gray-800 flex items-center gap-2">
              <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><circle cx="11" cy="11" r="8"/><path d="m21 21-4.3-4.3"/></svg>
              搜索
            </button>
          </div>
          <div class="flex gap-3 flex-wrap text-sm">
            <select id="filter-category" class="rounded-lg border border-gray-200 px-3 py-1.5 text-sm" onchange="SearchPage.onFilterChange()">
              <option value="">全部类别</option>
              <option value="法律">法律</option>
              <option value="行政法规">行政法规</option>
              <option value="监察法规">监察法规</option>
              <option value="司法解释">司法解释</option>
              <option value="地方性法规">地方性法规</option>
            </select>
            <select id="filter-province" class="rounded-lg border border-gray-200 px-3 py-1.5 text-sm" onchange="SearchPage.onFilterChange()">
              <option value="">全部省份</option>
            </select>
            <span class="text-xs text-gray-400 self-center">${this.state.query.length}/1000</span>
          </div>
        </div>

        <!-- 结果区 -->
        <div id="search-results">
          ${UI.emptyState('输入查询开始检索', isKeyword ? '按法规名+条号精确匹配' : '支持自然语言查询,如"个人信息跨境传输的规定"')}
        </div>
      </div>`;
  },

  setMode(mode) {
    this.state.mode = mode;
    this.state.results = [];
    this.state.total = 0;
    const content = document.getElementById('content');
    content.innerHTML = this.render();
    this.init();
  },

  init() {
    // 加载省份列表(从统计或固定列表)
    this.loadProvinces();
    // 恢复筛选状态
    if (this.state.category) document.getElementById('filter-category').value = this.state.category;
    if (this.state.province) document.getElementById('filter-province').value = this.state.province;
  },

  provinces: ['北京市','天津市','河北省','山西省','内蒙古自治区','辽宁省','吉林省','黑龙江省','上海市','江苏省','浙江省','安徽省','福建省','江西省','山东省','河南省','湖北省','湖南省','广东省','广西壮族自治区','海南省','重庆市','四川省','贵州省','云南省','西藏自治区','陕西省','甘肃省','青海省','宁夏回族自治区','新疆维吾尔自治区'],

  loadProvinces() {
    const sel = document.getElementById('filter-province');
    if (!sel) return;
    this.provinces.forEach(p => {
      const opt = document.createElement('option');
      opt.value = p; opt.textContent = p;
      sel.appendChild(opt);
    });
  },

  onFilterChange() {
    this.state.category = document.getElementById('filter-category').value;
    this.state.province = document.getElementById('filter-province').value;
    if (this.state.query) this.doSearch();
  },

  async doSearch(page) {
    const input = document.getElementById('search-input');
    if (input) this.state.query = input.value.trim();
    if (!this.state.query) return;

    // 自动判定模式:包含"第X条"且看起来像法规名+条号时,自动用精确查找
    const hasClauseNo = /第[一二三四五六七八九十百千零\d]+条/.test(this.state.query);
    const autoMode = hasClauseNo ? 'keyword' : this.state.mode;

    this.state.page = page || 1;
    this.state.loading = true;
    this.state.error = null;
    this.renderResults();

    try {
      const params = {
        query: this.state.query,
        mode: autoMode,
        top_k: 20,
        page: this.state.page,
        page_size: this.state.pageSize,
      };
      if (this.state.category) params.category = this.state.category;
      if (this.state.province) params.province = this.state.province;

      const resp = await API.search(params);
      this.state.results = resp.data.results || [];
      this.state.total = resp.data.total || 0;
      this.state.loading = false;
      this.renderResults();
    } catch (e) {
      this.state.loading = false;
      this.state.error = e.message;
      this.renderResults();
    }
  },

  renderResults() {
    const el = document.getElementById('search-results');
    if (!el) return;

    if (this.state.loading) {
      el.innerHTML = `<div class="flex items-center justify-center py-16 gap-3 text-gray-400">${UI.spinner(20)}<span class="text-sm">检索中...</span></div>`;
      return;
    }

    if (this.state.error) {
      el.innerHTML = UI.errorState(this.state.error, 'SearchPage.doSearch()');
      return;
    }

    if (!this.state.results.length && this.state.query) {
      el.innerHTML = UI.emptyState('无检索结果', '试试调整查询词或筛选条件');
      return;
    }

    if (!this.state.results.length) {
      el.innerHTML = UI.emptyState('输入查询开始检索', '支持自然语言查询');
      return;
    }

    const cards = this.state.results.map(r => UI.clauseCard(r)).join('');
    const pager = UI.pagination(this.state.page, this.state.pageSize, this.state.total, 'SearchPage.doSearch');
    // 显示当前检索模式
    const hasClauseNo = /第[一二三四五六七八九十百千零\d]+条/.test(this.state.query);
    const autoMode = hasClauseNo ? 'keyword' : this.state.mode;
    const modeLabel = autoMode === 'keyword' ? '精确查找' : '语义检索';
    const autoHint = hasClauseNo && this.state.mode === 'semantic' ? ' <span class="text-xs text-amber-500">(检测到条号,自动切换精确查找)</span>' : '';
    el.innerHTML = `<div class="mb-3 text-sm text-gray-500">找到 ${this.state.total} 条结果 <span class="text-xs text-gray-400">[${modeLabel}]</span>${autoHint}</div>${cards}${pager}`;
  },
};