/* NY 问卷考试系统数据平台 - 前端逻辑 */
(function () {
  'use strict';

  const $ = (s, r) => (r || document).querySelector(s);
  const $$ = (s, r) => Array.prototype.slice.call((r || document).querySelectorAll(s));

  const state = {
    projects: [],
    questions: [],
    rows: [],
    absent: [],
    unmatched: [],
    roster: [],       // 完整名单（含班级），用于按班级重算统计
    prevMap: {},      // sid -> 摘要，用于高亮变化
    prevSids: new Set(),   // 上一次刷新出现的 sid
    newSids: new Set(),     // 本次刷新新增的 sid（绿色底纹）
    hasPrev: false,
    fullScore: 100,
    sortKey: 'submit_ts',
    sortAsc: false,
    timer: null,
    loading: false,
    lastSig: '',
    connFail: 0
  };

  /* ---------------- 本地存储 ---------------- */
  // 浏览器关闭后仍然保留，账号/密码等敏感配置除外；进入页面时优先读缓存，再后台异步刷新
  const LS = {
    get(k, def) {
      try { const v = localStorage.getItem(k); return v == null ? def : JSON.parse(v); }
      catch (e) { return def; }
    },
    set(k, v) {
      try { localStorage.setItem(k, JSON.stringify(v)); } catch (e) { /* 隐私模式 */ }
    },
    del(k) { try { localStorage.removeItem(k); } catch (e) {} }
  };
  const LS_PROJECTS  = 'ny_projects';
  const LS_LASTPID   = 'ny_last_pid';
  const LS_LASTQID   = 'ny_last_qid';
  const LS_FILTERS   = 'ny_filters';        // {cls, grp} -> 跟随 projectId
  const LS_LAYOUT    = 'ny_layout';
  const LS_INTERVAL  = 'ny_interval';       // 用户手动调整的刷新间隔（跟随本机）
  const LS_ROSTER    = 'ny_roster_cache';   // 名单 cache（用于首屏补齐班级/组别下拉）
  const dataKey = pid => 'ny_data_' + pid;

  /* ---------------- 通用 ---------------- */
  async function api(action, opts) {
    opts = opts || {};
    const init = { method: opts.method || 'GET' };
    if (opts.body) {
      init.headers = { 'Content-Type': 'application/json' };
      init.body = JSON.stringify(opts.body);
    }
    if (opts.form) {
      init.method = 'POST';
      init.body = opts.form;
    }
    let url = 'api.php?action=' + encodeURIComponent(action);
    if (opts.params) {
      for (const k in opts.params) {
        if (opts.params[k] !== '' && opts.params[k] != null) {
          url += '&' + k + '=' + encodeURIComponent(opts.params[k]);
        }
      }
    }
    const res = await fetch(url, init);
    const text = await res.text();
    let json;
    try { json = JSON.parse(text); } catch (e) {
      throw new Error('服务端返回异常（可能 PHP 报错）：' + text.slice(0, 300));
    }
    if (!json.ok) {
      const err = new Error(json.msg || '请求失败');
      err.auth = !!(json.extra && json.extra.auth);
      err.extra = json.extra || null;
      throw err;
    }
    return json.data;
  }

  function esc(s) {
    return String(s == null ? '' : s).replace(/[&<>"']/g, c =>
      ({ '&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;', "'": '&#39;' }[c]));
  }

  function setConn(cls, text) {
    const el = $('#conn');
    el.className = 'conn ' + cls;
    el.innerHTML = '<i></i><span>' + esc(text) + '</span>';
  }

  function showAlert(msg, type) {
    const el = $('#alert');
    if (!msg) { el.classList.add('hidden'); return; }
    el.textContent = msg;
    el.className = 'alert' + (type === 'info' ? ' info' : '');
  }

  // 导出提示：说明本次导出的筛选范围
  function exportTip(what, cls, grp) {
    const parts = [];
    if (cls) parts.push(cls + (cls.indexOf('班') >= 0 ? '' : '班'));
    if (grp) parts.push(grp + (grp.indexOf('组') >= 0 ? '' : '组'));
    return '已导出' + what + (parts.length ? '（' + parts.join(' / ') + '）' : '（全部班级 / 组别）');
  }

  /* ---------------- 问卷列表 ---------------- */
  // 把数组渲染到 #projectSel（抽出便于缓存复用）
  function renderProjects() {
    const sel = $('#projectSel');
    const keep = sel.value;
    sel.innerHTML = '';
    if (!state.projects.length) {
      sel.innerHTML = '<option value="">（没有获取到问卷，请检查设置）</option>';
    } else {
      const ph = document.createElement('option');
      ph.value = ''; ph.textContent = '请选择问卷 / 考试';
      sel.appendChild(ph);

      // 双策略识别文件夹：
      // 1) mode 字段含 'folder'（卷王默认）
      // 2) 被其他项目作为 parent_id 引用（部分版本无 mode 字段，回退推断）
      const isFolder = p => (p.mode || '').toLowerCase().includes('folder');
      const parentIds = new Set();
      state.projects.forEach(p => {
        const pid = (p.parent_id || '0');
        if (pid && pid !== '0' && pid !== '') parentIds.add(pid);
      });
      const folderSet = new Set();
      state.projects.forEach(p => {
        if (isFolder(p) || parentIds.has(p.id)) folderSet.add(p.id);
      });
      const childOf = fid => state.projects.filter(p =>
        !folderSet.has(p.id) && (p.parent_id || '0') === fid);

      const mkOpt = p => {
        const o = document.createElement('option');
        o.value = p.id;
        o.textContent = (p.mode ? '[' + p.mode + '] ' : '') + p.name + '（' + (p.total || 0) + '份）';
        return o;
      };

      // 根项（不在任何文件夹里的）
      state.projects.filter(p => !folderSet.has(p.id))
        .forEach(p => sel.appendChild(mkOpt(p)));
      // 文件夹及子项（空文件夹不显示，避免点击报错）
      state.projects.filter(p => folderSet.has(p.id)).forEach(f => {
        const kids = childOf(f.id);
        if (!kids.length) return;
        const og = document.createElement('optgroup');
        og.label = '📁 ' + f.name;
        kids.forEach(p => og.appendChild(mkOpt(p)));
        sel.appendChild(og);
      });
    }
    if (keep && state.projects.some(p => p.id === keep)) sel.value = keep;
    else if (state.deeplinkProject && state.projects.some(p => p.id === state.deeplinkProject)) sel.value = state.deeplinkProject;
    else {
      const last = LS.get(LS_LASTPID, '');
      if (last && state.projects.some(p => p.id === last)) sel.value = last;
    }
    const surveyCount = state.projects.filter(p => !((p.mode || '').toLowerCase().includes('folder'))).length;
    setConn('conn-on', (state._fromCache ? '缓存 · ' : '') + '已连接 · ' + surveyCount + ' 个问卷');
    showAlert('');
    if (sel.value) refresh();
  }

  async function loadProjects() {
    setConn('conn-load', '连接中…');

    // 1) 先读本地缓存 → 立刻渲染，避免空白
    const cached = LS.get(LS_PROJECTS, []);
    if (Array.isArray(cached) && cached.length) {
      state.projects = cached;
      state._fromCache = true;
      renderProjects();
    }

    // 2) 再异步刷新
    try {
      const list = await api('projects');
      state.projects = list || [];
      state._fromCache = false;
      LS.set(LS_PROJECTS, state.projects);
      renderProjects();
    } catch (e) {
      if (!cached || !cached.length) {
        setConn('conn-err', '连接失败');
        showAlert('无法连接卷王系统：' + e.message + '\n请点击右上角【设置】检查系统地址、接口前缀与账号密码。');
      } else {
        showAlert('⚠️ 后台刷新失败，已显示本地缓存：' + e.message);
      }
    }
  }

  /* ---------------- 数据刷新 ---------------- */
  function applyData(d, opts) {
    opts = opts || {};
    state.questions = d.questions || [];
    state.rows      = d.rows || [];
    state.absent    = d.absent || [];
    state.unmatched = d.unmatched || [];
    state.roster    = d.roster || [];
    state.fullScore = (d.config && d.config.full_score) ? (parseInt(d.config.full_score, 10) || 100) : 100;

    const cur = new Set(state.rows.map(r => r.sid).filter(Boolean));
    if (state.hasPrev) state.newSids = new Set(Array.from(cur).filter(s => !state.prevSids.has(s)));
    else state.newSids = new Set();
    state.hasPrev = true;

    renderNameFields(d);
    renderStats();
    renderTable();
    state.prevSids = cur;
    populateClasses();
    populateGroups();
    renderAbsent();
    renderUnmatched();
    renderHints();

    $('#lastUpdate').textContent = d.updated_at || '—';
    setConn('conn-on', (opts.fromCache ? '缓存 · ' : '') + '实时 · ' + (d.project && d.project.name || ''));
    if (!opts.fromCache) showAlert('');
  }

  async function refresh(silent) {
    const pid = $('#projectSel').value;
    if (!pid) return;
    if (state.loading && !silent) return;
    state.loading = true;
    if (!silent) setConn('conn-load', '拉取数据…');

    // 1) 先读本地缓存 → 立即渲染，刷新期间保持视觉稳定
    const cached = LS.get(dataKey(pid), null);
    if (cached && cached.updated_at) {
      try {
        applyData(cached, { fromCache: true });
      } catch (e) { /* 旧格式缓存忽略 */ }
    }

    // 2) 后台异步拉真实数据
    try {
      const d = await api('data', { params: { projectId: pid, nameQid: $('#nameFieldSel').value } });
      applyData(d);
      state.connFail = 0;
      LS.set(dataKey(pid), d);
      LS.set(LS_LASTPID, pid);
      LS.set(LS_LASTQID, $('#nameFieldSel').value || '');
      // 名单缓存一份（便于刷新前/失败时仍能渲染班级/组别下拉）
      LS.set(LS_ROSTER, { ts: Date.now(), students: d.roster || [] });
    } catch (e) {
      if (e.auth) {
        // 卷王账号未配置或登录已失效：引导重新登录，避免卡在"已显示本地缓存"的死状态
        showAlert('卷王账号未配置或登录已失效，正在跳转登录页…', 'error');
        setTimeout(() => { location.href = 'login.php'; }, 900);
        return;
      }
      if (!cached) {
        if (!silent) setConn('conn-err', '数据获取失败');
        showAlert(e.message);
      } else {
        // 后台静默刷新失败：保留缓存数据，但把连接指示转为"中断"告警，成功即恢复
        state.connFail++;
        if (state.connFail >= 1) setConn('conn-warn', '⚠️ 实时刷新中断 · 已显示本地缓存');
        showAlert('⚠️ 后台刷新失败，已显示本地缓存：' + e.message);
      }
    } finally {
      state.loading = false;
      $('#liveDot').classList.add('on');
      setTimeout(() => $('#liveDot').classList.remove('on'), 900);
    }
  }

  function renderNameFields(d) {
    const sel = $('#nameFieldSel');
    const keep = sel.value;
    sel.innerHTML = '<option value="">自动识别</option>';
    const cands = d.name_candidates || [];
    cands.forEach(q => {
      const o = document.createElement('option');
      o.value = q.id;
      o.textContent = '姓名题：' + (q.title || q.id);
      sel.appendChild(o);
    });
    (d.questions || []).forEach(q => {
      if (cands.some(c => c.id === q.id)) return;
      const o = document.createElement('option');
      o.value = q.id;
      o.textContent = (q.title || q.id) + '（' + (q.type || '') + '）';
      sel.appendChild(o);
    });
    const lastQid = LS.get(LS_LASTQID, '');
    if (keep) sel.value = keep;
    else if (state.deeplinkQid) sel.value = state.deeplinkQid;
    else if (lastQid && (cands.some(c => c.id === lastQid) || (d.questions || []).some(q => q.id === lastQid))) sel.value = lastQid;
    else if (d.name_qid) sel.value = d.name_qid;
  }

  function populateClasses() {
    const sel = $('#clsSel');
    const cur = sel.value;
    const set = new Set();
    (state.roster || []).forEach(s => { if (s.cls) set.add(s.cls); });
    const vals = Array.from(set).sort((a, b) => a.localeCompare(b, 'zh', { numeric: true }));
    sel.innerHTML = '<option value="">全部班级</option>' +
      vals.map(v => '<option value="' + esc(v) + '">' + esc(v) + '</option>').join('');
    // 优先保留用户当前已选项；否则按本地缓存恢复（跟随 projectId）
    const pid = $('#projectSel').value;
    const cache = pid ? (LS.get(LS_FILTERS, {})[pid] || {}) : {};
    if (vals.indexOf(cur) >= 0) sel.value = cur;
    else if (cache.cls && vals.indexOf(cache.cls) >= 0) sel.value = cache.cls;
    else sel.value = '';
  }

  // 组别下拉：仅显示当前所选班级内出现的组别（"全部班级" 时显示所有组别）
  function populateGroups() {
    const cls = $('#clsSel').value;
    const grpSel = $('#grpSel');
    if (!grpSel) return;
    const cur = grpSel.value;
    const set = new Set();
    (state.roster || []).forEach(s => {
      if (cls && (s.cls || '') !== cls) return;
      if (s.grp) set.add(s.grp);
    });
    const vals = Array.from(set).sort();
    grpSel.innerHTML = '<option value="">全部组别</option>' +
      vals.map(v => '<option value="' + esc(v) + '">' + esc(v) + '</option>').join('');
    const pid = $('#projectSel').value;
    const cache = pid ? (LS.get(LS_FILTERS, {})[pid] || {}) : {};
    if (vals.indexOf(cur) >= 0) grpSel.value = cur;
    else if (cache.grp && vals.indexOf(cache.grp) >= 0) grpSel.value = cache.grp;
    else grpSel.value = '';
  }

  function rememberFilters() {
    const pid = $('#projectSel').value;
    if (!pid) return;
    const all = LS.get(LS_FILTERS, {});
    all[pid] = { cls: $('#clsSel').value, grp: $('#grpSel').value, ts: Date.now() };
    LS.set(LS_FILTERS, all);
  }

  // 按当前所选班级 + 组别（或无）客户端重算统计卡片
  function computeDisplayStats(cls, grp) {
    const allStudents = state.roster || [];
    let students = cls ? allStudents.filter(s => (s.cls || '') === cls) : allStudents;
    let rows     = cls ? state.rows.filter(r => (r.cls || '') === cls) : state.rows;
    if (grp) {
      students = students.filter(s => (s.grp || '') === grp);
      rows     = rows.filter(r => (r.grp || '') === grp);
    }
    const total = students.length;
    const submitted = rows.length;
    const absent = Math.max(0, total - submitted);
    const rate = total > 0 ? Math.round(submitted / total * 1000) / 10 : 0;

    const scores = rows.map(r => r.score).filter(v => v !== null && v !== undefined);
    const avg = scores.length ? Math.round(scores.reduce((a, b) => a + b, 0) / scores.length * 100) / 100 : null;

    const full = state.fullScore || 100;
    const passCount = rows.filter(r => r.score !== null && r.score !== undefined && r.score >= 0.6 * full).length;
    const passRate = submitted > 0 ? Math.round(passCount / submitted * 1000) / 10 : 0;

    let maxScore = null, minScore = null;
    const maxNames = [], minNames = [];
    rows.forEach(r => {
      if (r.score === null || r.score === undefined) return;
      if (maxScore === null || r.score > maxScore) { maxScore = r.score; maxNames.length = 0; maxNames.push(r.name); }
      else if (r.score === maxScore) maxNames.push(r.name);
      if (minScore === null || r.score < minScore) { minScore = r.score; minNames.length = 0; minNames.push(r.name); }
      else if (r.score === minScore) minNames.push(r.name);
    });

    const durs = rows.map(r => r.duration).filter(v => v !== null && v !== undefined);
    const avgDur = durs.length ? Math.round(durs.reduce((a, b) => a + b, 0) / durs.length) : null;

    return {
      total, submitted, absent, rate, avg, passRate,
      maxScore, minScore, maxNames, minNames, avgDur
    };
  }

  function renderStats() {
    const cls = $('#clsSel').value;
    const grp = $('#grpSel').value;
    const st = computeDisplayStats(cls, grp);
    const set = (id, v) => { const el = $(id); if (el) el.textContent = v; };
    set('#sTotal', st.total);
    set('#sSubmit', st.submitted);
    set('#sAbsent', st.absent);
    set('#sAvg', st.avg == null ? '-' : st.avg);
    set('#sMax', st.maxScore == null ? '-' : st.maxScore);
    set('#sMin', st.minScore == null ? '-' : st.minScore);
    set('#sPass', st.passRate + '%');
    set('#sDur', st.avgDur == null ? '-' : fmtDur(st.avgDur));
  }

  // 各面板计数文字按所选班级 + 组别过滤（成绩明细 / 缺考名单）
  // 缺考数与统计卡片保持一致：过滤后名单 − 过滤后提交（而非二次过滤后端 absent 数组）
  function renderHints() {
    const cls = $('#clsSel').value;
    const grp = $('#grpSel').value;
    const rowsForCls = cls ? state.rows.filter(r => (r.cls || '') === cls) : state.rows;
    const rosterForCls = cls ? (state.roster || []).filter(s => (s.cls || '') === cls) : (state.roster || []);
    const rowsForGrp = grp ? rowsForCls.filter(r => (r.grp || '') === grp) : rowsForCls;
    const rosterForGrp = grp ? rosterForCls.filter(s => (s.grp || '') === grp) : rosterForCls;
    const absentForGrp = Math.max(0, rosterForGrp.length - rowsForGrp.length);
    $('#tableHint').textContent = '共 ' + rowsForGrp.length + ' 人已提交 · 名单 ' + rosterForGrp.length + ' 人';
    $('#absentHint').textContent = absentForGrp ? '共 ' + absentForGrp + ' 人' : '';
  }

  function fmtDur(sec) {
    if (sec == null) return '-';
    if (sec < 60) return sec + ' 秒';
    const m = Math.floor(sec / 60), s = sec % 60;
    if (m < 60) return m + ' 分 ' + String(s).padStart(2, '0') + ' 秒';
    const h = Math.floor(m / 60);
    return h + ' 小时 ' + String(m % 60).padStart(2, '0') + ' 分';
  }

  function scoreClass(v) {
    if (v == null) return '';
    if (v >= 90) return 'score-high';
    if (v >= 60) return 'score-mid';
    return 'score-low';
  }

  function renderTable() {
    const kw = $('#kw').value.trim().toLowerCase();
    const clsFilter = $('#clsSel').value;
    const grpFilter = $('#grpSel').value;
    let rows = state.rows.slice();

    if (clsFilter) rows = rows.filter(r => (r.cls || '') === clsFilter);
    if (grpFilter) rows = rows.filter(r => (r.grp || '') === grpFilter);
    if (kw) rows = rows.filter(r =>
      String(r.sid).toLowerCase().includes(kw) || String(r.name).toLowerCase().includes(kw));

    const k = state.sortKey, dir = state.sortAsc ? 1 : -1;
    rows.sort((a, b) => {
      let x = a[k], y = b[k];
      if (k === 'sid' || k === 'cls') {
        const na = parseFloat(x), nb = parseFloat(y);
        if (!isNaN(na) && !isNaN(nb)) return (na - nb) * dir;
        return String(x == null ? '' : x).localeCompare(String(y == null ? '' : y), 'zh', { numeric: true }) * dir;
      }
      if (x == null) x = -1;
      if (y == null) y = -1;
      if (typeof x === 'string') return x.localeCompare(String(y), 'zh', { numeric: true }) * dir;
      return (x - y) * dir;
    });

    const tb = $('#tbody');
    if (!rows.length) {
      tb.innerHTML = '<tr><td colspan="7" class="empty">' +
        (state.rows.length ? '没有匹配的记录' : '暂无提交记录') + '</td></tr>';
      return;
    }
    tb.innerHTML = rows.map(r => {
      const sig = r.sid + '|' + r.score + '|' + r.submit_at;
      const changed = state.prevMap[r.sid] && state.prevMap[r.sid] !== sig;
      const isNew = r.sid && state.newSids.has(r.sid);
      const canDrill = (r.attempts || 1) > 1;
      const clsName = (changed ? 'diff ' : '') + (isNew ? 'new ' : '') + (canDrill ? 'clickable' : '');
      const att = canDrill ? ' <span class="tag tag-att" title="查看 ' + r.attempts + ' 次提交明细">刷' + r.attempts + '次</span>' : '';
      const onclk = canDrill ? ' onclick="openAttemptsModal(' + JSON.stringify(r.sid) + ')"' : '';
      return '<tr class="' + clsName.trim() + '"' + onclk + '>' +
        '<td class="sid">' + esc(r.sid) + '</td>' +
        '<td class="name">' + esc(r.name) + att + '</td>' +
        '<td>' + esc(r.cls || '') + '</td>' +
        '<td>' + esc(r.grp || '') + '</td>' +
        '<td class="score num ' + scoreClass(r.score) + '">' + (r.score == null ? '-' : r.score) + '</td>' +
        '<td class="num">' + esc(r.submit_at) + '</td>' +
        '<td class="num">' + esc(r.duration_txt) + '</td>' +
        '</tr>';
    }).join('');

    const map = {};
    state.rows.forEach(r => { map[r.sid] = r.sid + '|' + r.score + '|' + r.submit_at; });
    state.prevMap = map;

    $$('#dataTable th.sortable').forEach(th => {
      const isCur = th.dataset.k === state.sortKey;
      th.innerHTML = th.textContent.replace(/[\s↑↓]+$/, '') + (isCur ? ' <span class="arrow">' + (state.sortAsc ? '↑' : '↓') + '</span>' : '');
    });
  }

  function renderAbsent() {
    const clsFilter = $('#clsSel').value;
    const grpFilter = $('#grpSel').value;
    // 与统计卡片保持一致：缺考 = 过滤后名单中未出现在提交记录里的学生（按 sid 匹配）
    const rowsForCls = clsFilter ? state.rows.filter(r => (r.cls || '') === clsFilter) : state.rows;
    const rowsForGrp = grpFilter ? rowsForCls.filter(r => (r.grp || '') === grpFilter) : rowsForCls;
    const submittedSids = new Set(rowsForGrp.map(r => r.sid).filter(Boolean));
    const rosterForCls = clsFilter ? (state.roster || []).filter(s => (s.cls || '') === clsFilter) : (state.roster || []);
    const rosterForGrp = grpFilter ? rosterForCls.filter(s => (s.grp || '') === grpFilter) : rosterForCls;
    const list = rosterForGrp.filter(s => !submittedSids.has(s.sid));
    const tb = $('#absentBody');
    if (!list.length) {
      tb.innerHTML = '<tr><td colspan="4" class="empty">' + (clsFilter ? '本班全部已提交 🎉' : '全部已提交 🎉') + '</td></tr>';
      return;
    }
    tb.innerHTML = list.map(a =>
      '<tr><td class="sid">' + esc(a.sid) + '</td><td>' + esc(a.name) + '</td><td>' + esc(a.cls || '') + '</td><td>' + esc(a.grp || '') + '</td></tr>').join('');
  }

  function renderUnmatched() {
    const tb = $('#unmatchedBody');
    if (!state.unmatched.length) {
      tb.innerHTML = '<tr><td colspan="3" class="empty">无</td></tr>';
      return;
    }
    tb.innerHTML = state.unmatched.map(u =>
      '<tr><td>' + esc(u.name) + '</td><td class="num">' + (u.score == null ? '-' : u.score) +
      '</td><td class="num">' + esc(u.submit_at) + '</td></tr>').join('');
  }

  /* 多次刷题下钻弹窗（主统计页成绩明细） */
  function openAttemptsModal(sid) {
    const r = (state.rows || []).find(x => String(x.sid) === String(sid));
    if (!r || (r.attempts || 1) <= 1) return;
    const list = r.attempts_list || [];
    const rows = list.map(a => {
      const sc = a.score == null ? '<span class="muted">未判分</span>' : esc(a.score);
      const tmp = a.temp_save ? ' <span class="tag tag-gray">暂存</span>' : '';
      return '<tr><td class="num">' + esc(a.submit_at) + '</td><td class="num">' + sc + tmp +
        '</td><td class="num">' + esc(a.duration_txt || '-') + '</td></tr>';
    }).join('');
    $('#attTitle').textContent = (r.name || '') + ' · 共 ' + r.attempts + ' 次提交';
    $('#attBody').innerHTML = list.length
      ? '<table class="grid compact"><thead><tr><th>提交时间</th><th>成绩</th><th>考试时长</th></tr></thead><tbody>' + rows + '</tbody></table>'
      : '<div class="empty">无提交明细</div>';
    $('#attemptsModal').classList.add('open');
  }
  function closeAttemptsModal() {
    const m = $('#attemptsModal');
    if (m) m.classList.remove('open');
  }

  /* ---------------- 自动刷新 ---------------- */
  function schedule() {
    if (state.timer) clearInterval(state.timer);
    if (!$('#autoRefresh').checked) return;
    const sec = parseInt($('#intervalSel').value, 10) || 15;
    state.timer = setInterval(() => refresh(true), sec * 1000);
  }

  /* ---------------- 全屏 ---------------- */
  function toggleFullscreen() {
    const el = document.documentElement;
    if (!document.fullscreenElement && !document.webkitFullscreenElement) {
      const req = el.requestFullscreen || el.webkitRequestFullscreen;
      if (req) req.call(el);
    } else {
      const exit = document.exitFullscreen || document.webkitExitFullscreen;
      if (exit) exit.call(document);
    }
  }
  function onFsChange() {
    const on = !!(document.fullscreenElement || document.webkitFullscreenElement);
    document.body.classList.toggle('fs-on', on);
    const btn = $('#btnFullscreen');
    if (btn) btn.textContent = on ? '⛶ 退出全屏' : '⛶ 全屏';
  }

  /* ---------------- 布局切换 ---------------- */
  function applyLayout(mode) {
    const m = (mode === 'side') ? 'side' : 'default';
    const lay = document.getElementById('dataLayout');
    if (lay) lay.setAttribute('data-layout', m);
    LS.set(LS_LAYOUT, m);
  }

  /* ---------------- 设置 ---------------- */
  async function openSettings() {
    try {
      const c = await api('config_get');
      $('#cfgPageSize').value = c.page_size || 200;
      $('#cfgInterval').value = c.refresh_interval || 15;
      $('#cfgTimeout').value = c.timeout || 20;
      $('#cfgKeywords').value = c.name_keywords || '姓名';
      $('#cfgDedupe').checked = !!c.dedupe;
      $('#cfgTemp').checked = !!c.include_temp_save;
      $('#cfgSsl').checked = !!c.verify_ssl;
      // 布局
      const layout = c.layout || LS.get(LS_LAYOUT, 'default');
      (document.querySelector('input[name=cfgLayout][value="' + layout + '"]') || {}).checked = true;
      // 满分：默认 + 各试卷独立
      $('#cfgFull').value = c.full_score || 100;
      renderFullScores((c.full_scores && typeof c.full_scores === 'object') ? c.full_scores : {});
      // 连接信息（账号回显；密码不回显）
      $('#cfgBase').value = (c.base_url || '') + (c.api_prefix || '/api');
      $('#cfgUser').value = c.username || '';
      $('#cfgPass').value = '';
      const conn = c.db_configured
        ? (c.db_connected
            ? '数据库：已连接 (' + (c.db_driver || '') + ')'
            : ('数据库：未连接 · ' + (c.db_error || '未知错误')))
        : '数据库：未配置（使用文件存储）';
      $('#cfgConnInfo').textContent = '配置来源：' + (c.storage || 'default') + ' · ' + conn;
      $('#pingResult').classList.add('hidden');
    } catch (e) { showAlert(e.message); }
    $('#settingsModal').classList.add('open');
  }

  // 渲染"各试卷独立满分"列表
  function renderFullScores(scores) {
    const box = $('#fullScoresBox');
    if (!box) return;
    if (!state.projects.length) {
      box.innerHTML = '<span class="hint">暂无试卷，请先连接卷王系统并选择问卷</span>';
      return;
    }
    // 排除文件夹项：模式为文件夹的无可答卷
    const surveys = state.projects.filter(p => !((p.mode || '').toLowerCase().includes('folder')));
    if (!surveys.length) {
      box.innerHTML = '<span class="hint">尚未获取到可答卷</span>';
      return;
    }
    box.innerHTML = surveys.map(p => {
      const val = scores[p.id] != null ? scores[p.id] : '';
      return '<div class="row">' +
        '<label title="' + esc(p.name) + '">' + esc(p.name) + '</label>' +
        '<input type="number" min="1" max="1000" data-pid="' + esc(p.id) + '" value="' + esc(val) + '" placeholder="默认">' +
        '</div>';
    }).join('');
    $('#fullScoresHint').textContent = '默认分值为空时使用上方"默认满分"；填写即单独覆盖该卷';
  }

  /* ---------------- 名单 ---------------- */
  let rosterDraft = [];

  async function openRoster() {
    try {
      const d = await api('roster');
      rosterDraft = d.students || [];
      renderRoster();
      $('#rosterMeta').textContent = '共 ' + rosterDraft.length + ' 人' +
        (d.meta && d.meta.updated_at ? ' · 更新于 ' + d.meta.updated_at : '');
    } catch (e) { showAlert(e.message); }
    $('#rosterModal').classList.add('open');
  }

  function renderRoster() {
    const kw = $('#rosterSearch').value.trim().toLowerCase();
    const rows = rosterDraft.filter(r => !kw ||
      String(r.sid).toLowerCase().includes(kw) || String(r.name).toLowerCase().includes(kw));
    const tb = $('#rosterBody');
    if (!rows.length) {
      tb.innerHTML = '<tr><td colspan="4" class="empty">暂无名单，请上传文件</td></tr>';
      return;
    }
    tb.innerHTML = rows.map((r, i) => {
      const gi = rosterDraft.indexOf(r);
      return '<tr data-i="' + gi + '">' +
        '<td><input value="' + esc(r.sid) + '" data-f="sid"></td>' +
        '<td><input value="' + esc(r.name) + '" data-f="name"></td>' +
        '<td><input value="' + esc(r.cls || '') + '" data-f="cls" placeholder="可选"></td>' +
        '<td><input value="' + esc(r.grp || '') + '" data-f="grp" placeholder="A/B"></td>' +
        '<td><span class="link-del" data-del="' + gi + '">删除</span></td></tr>';
    }).join('');
  }

  /* ---------------- 事件绑定 ---------------- */
  document.addEventListener('DOMContentLoaded', function () {

    $('#btnRefresh').addEventListener('click', () => refresh(false));
    $('#btnSettings').addEventListener('click', openSettings);
    $('#btnRoster').addEventListener('click', openRoster);
    $('#btnFullscreen').addEventListener('click', toggleFullscreen);
    document.addEventListener('fullscreenchange', onFsChange);
    if (document.webkitFullscreenEnabled === undefined && !document.documentElement.requestFullscreen && !document.documentElement.webkitRequestFullscreen) {
      $('#btnFullscreen').style.display = 'none';
    }
    $('#kw').addEventListener('input', renderTable);
    $('#clsSel').addEventListener('change', () => {
      populateGroups();
      rememberFilters();
      renderStats();
      renderTable();
      renderAbsent();
      renderHints();
    });
    $('#grpSel').addEventListener('change', () => {
      rememberFilters();
      renderStats();
      renderTable();
      renderAbsent();
      renderHints();
    });
    $('#nameFieldSel').addEventListener('change', () => {
      state.prevMap = {}; state.prevSids = new Set(); state.hasPrev = false;
      LS.set(LS_LASTQID, $('#nameFieldSel').value || '');
      refresh();
    });
    $('#projectSel').addEventListener('change', () => {
      // 切换项目后清掉前一项目的 prevMap 与高亮缓存
      state.prevMap = {}; state.prevSids = new Set(); state.hasPrev = false;
      // 用缓存数据先快速渲染，再后台拉新数据
      refresh();
    });
    $('#intervalSel').addEventListener('change', () => {
      LS.set(LS_INTERVAL, parseInt($('#intervalSel').value, 10) || 15);
      schedule();
    });
    $('#autoRefresh').addEventListener('change', e => {
      if (e.target.checked) { schedule(); refresh(true); }
      else if (state.timer) clearInterval(state.timer);
    });

    $$('#dataTable th.sortable').forEach(th => {
      th.addEventListener('click', () => {
        if (state.sortKey === th.dataset.k) state.sortAsc = !state.sortAsc;
        else { state.sortKey = th.dataset.k; state.sortAsc = true; }
        renderTable();
      });
    });

    // 导出跟随当前班级 / 组别筛选（统计卡片与表格显示什么，就导出什么）
    $('#btnExport').addEventListener('click', () => {
      const pid = $('#projectSel').value;
      if (!pid) return showAlert('请先选择问卷 / 考试');
      const cls = $('#clsSel').value, grp = $('#grpSel').value;
      location.href = 'api.php?action=export&projectId=' + encodeURIComponent(pid) +
        '&nameQid=' + encodeURIComponent($('#nameFieldSel').value) +
        '&cls=' + encodeURIComponent(cls) + '&grp=' + encodeURIComponent(grp);
      showAlert(exportTip('成绩明细', cls, grp), 'info');
    });
    $('#btnExportAbsent').addEventListener('click', () => {
      const pid = $('#projectSel').value;
      if (!pid) return showAlert('请先选择问卷 / 考试');
      const cls = $('#clsSel').value, grp = $('#grpSel').value;
      location.href = 'api.php?action=export_absent&projectId=' + encodeURIComponent(pid) +
        '&nameQid=' + encodeURIComponent($('#nameFieldSel').value) +
        '&cls=' + encodeURIComponent(cls) + '&grp=' + encodeURIComponent(grp);
      showAlert(exportTip('缺考名单', cls, grp), 'info');
    });

    /* 弹窗关闭 */
    document.addEventListener('click', e => {
      if (e.target.matches('[data-close]') || e.target.classList.contains('modal')) {
        $$('.modal').forEach(m => m.classList.remove('open'));
      }
    });

    /* 设置保存 */
    $('#btnSaveCfg').addEventListener('click', async () => {
      const btnSave = $('#btnSaveCfg');
      btnSave.disabled = true; btnSave.textContent = '保存中…';
      const pass = $('#cfgPass').value;
      const payload = {
        page_size: parseInt($('#cfgPageSize').value, 10) || 200,
        refresh_interval: parseInt($('#cfgInterval').value, 10) || 15,
        timeout: parseInt($('#cfgTimeout').value, 10) || 20,
        name_keywords: $('#cfgKeywords').value.trim(),
        dedupe: $('#cfgDedupe').checked,
        include_temp_save: $('#cfgTemp').checked,
        verify_ssl: $('#cfgSsl').checked,
        full_score: parseInt($('#cfgFull').value, 10) || 100,
        layout: (document.querySelector('input[name=cfgLayout]:checked') || {}).value || 'default',
        full_scores: collectFullScores(),
        username: $('#cfgUser').value.trim(),
      };
      if (pass !== '') payload.password = pass;   // 留空 = 不修改
      let resp;
      try {
        resp = await api('config_save', { method: 'POST', body: payload });
      } catch (e) { showAlert(e.message); btnSave.disabled = false; btnSave.textContent = '保存'; return; }
      $('#cfgPass').value = '';  // 提交后清空密码框
      const note = (resp && resp.conn_changed) ? '账号/连接已更新' : '设置已保存';
      if (resp && resp.ping) {
        if (resp.ping.ok) {
          showAlert(note + '，测连接成功（' + resp.ping.projects + ' 个项目 / ' + resp.ping.elapsed + 'ms）', 'info');
        } else {
          showAlert(note + '，但测连接失败：' + resp.ping.msg, 'error');
        }
      } else {
        showAlert(note, 'info');
      }
      // 应用布局偏好（写入容器 + localStorage）
      applyLayout(payload.layout);
      const iv = payload.refresh_interval;
      const opts = $$('#intervalSel option').map(o => parseInt(o.value, 10));
      let best = opts[0];
      opts.forEach(v => { if (Math.abs(v - iv) < Math.abs(best - iv)) best = v; });
      $('#intervalSel').value = String(best);
      schedule();
      loadProjects();
      // ping 失败时保留弹窗，让用户能立即改回
      if (!resp || !resp.ping || resp.ping.ok) {
        $('#settingsModal').classList.remove('open');
      }
      btnSave.disabled = false; btnSave.textContent = '保存';
    });

    /* 独立测试连接（使用弹窗内尚未保存的账号/密码，不落盘） */
    async function testConnection() {
      const btn = $('#btnTestConn');
      const box = $('#pingResult');
      if (!btn || !box) return;
      btn.disabled = true; btn.textContent = '测试中…';
      box.classList.remove('hidden', 'err'); box.classList.add('loading');
      box.textContent = '正在连接卷王系统测试…';
      try {
        // 仅传可编辑的连接字段；base_url / api_prefix 在弹窗中只读，沿用已保存值
        const r = await api('config_test', {
          method: 'POST',
          body: {
            username: $('#cfgUser').value.trim(),
            password: $('#cfgPass').value,
            verify_ssl: $('#cfgSsl').checked
          }
        });
        box.classList.remove('loading');
        if (r && r.connected) {
          box.classList.remove('err');
          box.textContent = '✅ 连接成功：检测到 ' + r.projects + ' 个问卷 / 用时 ' + r.elapsed + 'ms';
        } else {
          box.classList.add('err');
          box.textContent = '❌ 连接失败：' + ((r && r.msg) || '未知错误');
        }
      } catch (e) {
        box.classList.remove('loading'); box.classList.add('err');
        box.textContent = '❌ 测试请求异常：' + e.message;
      } finally {
        btn.disabled = false; btn.textContent = '测试连接';
      }
    }
    $('#btnTestConn').addEventListener('click', testConnection);

    // 收集"各试卷独立满分" -> {projectId: score}
    function collectFullScores() {
      const out = {};
      $$('#fullScoresBox input[data-pid]').forEach(inp => {
        const v = parseInt(inp.value, 10);
        if (inp.dataset.pid && !isNaN(v) && v > 0) out[inp.dataset.pid] = v;
      });
      return out;
    }

    /* 名单上传 */
    const zone = $('#dropZone'), fileInput = $('#rosterFile');
    zone.addEventListener('click', () => fileInput.click());
    zone.addEventListener('dragover', e => { e.preventDefault(); zone.classList.add('over'); });
    zone.addEventListener('dragleave', () => zone.classList.remove('over'));
    zone.addEventListener('drop', e => {
      e.preventDefault(); zone.classList.remove('over');
      if (e.dataTransfer.files.length) uploadRoster(e.dataTransfer.files[0]);
    });
    fileInput.addEventListener('change', () => {
      if (fileInput.files.length) uploadRoster(fileInput.files[0]);
      fileInput.value = '';
    });

    async function uploadRoster(file) {
      const fd = new FormData();
      fd.append('file', file);
      const mode = (document.querySelector('input[name=impMode]:checked') || {}).value || 'replace';
      fd.append('mode', mode);
      try {
        const d = await api('roster_import', { form: fd });
        rosterDraft = d.students || [];
        renderRoster();
        $('#rosterMeta').textContent = '共 ' + rosterDraft.length + ' 人 · 导入完成';
        $('#rosterBadge').textContent = rosterDraft.length;
      } catch (e) { showAlert(e.message); }
    }

    $('#rosterSearch').addEventListener('input', renderRoster);
    $('#btnAddRow').addEventListener('click', () => {
      rosterDraft.push({ sid: '', name: '', cls: '' });
      renderRoster();
    });
    $('#btnClearRoster').addEventListener('click', async () => {
      if (!confirm('确定清空全部名单？')) return;
      try {
        const d = await api('roster_clear', { method: 'POST' });
        rosterDraft = [];
        renderRoster();
        $('#rosterBadge').textContent = '0';
        $('#rosterMeta').textContent = '共 0 人';
      } catch (e) { showAlert(e.message); }
    });

    $('#rosterBody').addEventListener('input', e => {
      const tr = e.target.closest('tr');
      if (!tr) return;
      const i = parseInt(tr.dataset.i, 10);
      if (isNaN(i)) return;
      rosterDraft[i][e.target.dataset.f] = e.target.value;
    });
    $('#rosterBody').addEventListener('click', e => {
      const id = e.target.getAttribute && e.target.getAttribute('data-del');
      if (id == null) return;
      rosterDraft.splice(parseInt(id, 10), 1);
      renderRoster();
    });

    $('#btnSaveRoster').addEventListener('click', async () => {
      try {
        const d = await api('roster_save', { method: 'POST', body: { students: rosterDraft } });
        rosterDraft = d.students || [];
        renderRoster();
        $('#rosterBadge').textContent = rosterDraft.length;
        $('#rosterMeta').textContent = '共 ' + rosterDraft.length + ' 人 · 已保存';
        if ($('#projectSel').value) refresh(true);
      } catch (e) { showAlert(e.message); }
    });

    /* 启动 */
    // 1) 恢复布局偏好（仅样式，不涉及数据）
    applyLayout(LS.get(LS_LAYOUT, 'default'));

    // 2) 支持 ?projectId=xxx&nameQid=yyy 直接打开某份问卷
    const qs = new URLSearchParams(location.search);
    if (qs.get('interval')) $('#intervalSel').value = qs.get('interval');
    else {
      const iv = LS.get(LS_INTERVAL, 0);
      if (iv) {
        const opts = $$('#intervalSel option').map(o => parseInt(o.value, 10));
        if (opts.indexOf(iv) >= 0) $('#intervalSel').value = String(iv);
      }
    }
    state.deeplinkProject = qs.get('projectId') || '';
    state.deeplinkQid = qs.get('nameQid') || '';

    // 退出登录：跳转到独立 logout.php（清服务端会话）
    $('#btnLogout').addEventListener('click', () => { location.href = 'logout.php'; });

    // 3) 支持 index.php#roster 直接打开名单管理（随机抽取页的「名单管理」入口用）
    if (location.hash === '#roster') {
      openRoster();
      if (history.replaceState) history.replaceState(null, '', location.pathname + location.search);
    }

    // 启动：主界面在 PHP 端已做会话校验（未登录会跳到 login.php），此处直接加载数据
    schedule();
    loadProjects();
  });
})();