// MoNaCo dev viewer — sibling of open-wikitable-smoke-viewer, adapted for the
// 100-question monaco_dev subset. Key divergences from the smoke viewer:
//
//   • scoring column is LLM judge_score (not deterministic F1). Every metric
//     the trajectory / compare cards expose comes from the AML judge output
//     (parsed.judge_score / precision / recall).
//   • dataset tab renders the monaco raw schema (question_decomposition +
//     steps + docs[] — no SQL).
//   • 3 e2e runs (v0, v2, v3) instead of 2.
//   • sidebar has NO subset/pill filters — just the 100 qids.
//
// View modes:
//   - "dataset"                — source monaco raw record per qid
//   - "unified"                — unified eval bundle
//   - "trajectories"           — standalone agentic · structure per q  (cell4_agentic_a)
//   - "trajectories_corpus"    — standalone agentic · structure per ds (cell5_agentic_b)
//   - "trajectories_rawtext"   — standalone agentic · DCI              (cell6_agentic_c v2)
//   - "e2e_v0" / "e2e_v2" / "e2e_v3" — e2e_pipeline runs (agent trajectories)
//   - "e2e_structures_v0/2/3"  — per-qid supporting doc + generated structures
//   - "compare"                — side-by-side grid across all 9 configs
//
// State machine: load index.json → render sidebar → on click/nav fetch
// records/<qid>.json and render question + tables / trajectory / compare grid.

(function () {
  'use strict';

  const MODES = {
    dataset: {
      indexUrl: 'index.json',
      recordsDir: 'records',
      topbarSub: 'dev subset · 100 questions',
      indexShape: 'array',
    },
    unified: {
      indexUrl: 'unified/index.json',
      recordsDir: 'unified/records',
      topbarSub: 'unified eval bundle · dev 100-qid subset',
      indexShape: 'array',
    },
    trajectories: {
      indexUrl: 'trajectories/index.json',
      recordsDir: 'trajectories/records',
      indexShape: 'wrapped',
    },
    trajectories_corpus: {
      indexUrl: 'trajectories_corpus/index.json',
      recordsDir: 'trajectories_corpus/records',
      indexShape: 'wrapped',
    },
    trajectories_rawtext: {
      indexUrl: 'trajectories_rawtext/index.json',
      recordsDir: 'trajectories_rawtext/records',
      indexShape: 'wrapped',
    },
    e2e_v0: {
      indexUrl: 'trajectories_e2e_v0/index.json',
      recordsDir: 'trajectories_e2e_v0/records',
      indexShape: 'wrapped',
    },
    e2e_v2: {
      indexUrl: 'trajectories_e2e_v2/index.json',
      recordsDir: 'trajectories_e2e_v2/records',
      indexShape: 'wrapped',
    },
    e2e_v3: {
      indexUrl: 'trajectories_e2e_v3/index.json',
      recordsDir: 'trajectories_e2e_v3/records',
      indexShape: 'wrapped',
    },
    e2e_structures_v0: {
      indexUrl: 'e2e_structures_v0/index.json',
      recordsDir: 'e2e_structures_v0/records',
      indexShape: 'wrapped',
    },
    e2e_structures_v2: {
      indexUrl: 'e2e_structures_v2/index.json',
      recordsDir: 'e2e_structures_v2/records',
      indexShape: 'wrapped',
    },
    e2e_structures_v3: {
      indexUrl: 'e2e_structures_v3/index.json',
      recordsDir: 'e2e_structures_v3/records',
      indexShape: 'wrapped',
    },
    compare: {
      indexUrl: 'compare/index.json',
      recordsDir: 'compare/records',
      indexShape: 'wrapped',
    },
  };

  const modeState = Object.fromEntries(
    Object.keys(MODES).map((k) => [k, { index: [], filtered: [], selectedQid: null, cache: new Map(), meta: null }])
  );

  const state = {
    viewMode: 'dataset',
    search: '',
    stopReasonFilter: 'all',
    scoreFilter: 'all',
    compareDisagreeFilter: 'all',
    activeBucket: 'supporting',
  };

  function curMode() { return modeState[state.viewMode]; }

  // Trajectory-shape modes share the same index schema
  // (qid, question, judge_score, correct, has_error, stop_reason, n_turns).
  const TRAJ_MODES = new Set([
    'trajectories', 'trajectories_corpus', 'trajectories_rawtext',
    'e2e_v0', 'e2e_v2', 'e2e_v3',
  ]);
  const E2E_STRUCT_MODES = new Set(['e2e_structures_v0', 'e2e_structures_v2', 'e2e_structures_v3']);

  // ── DOM ────────────────────────────────────────────────────────────
  const dom = {
    list: document.getElementById('qidList'),
    main: document.getElementById('mainPane'),
    search: document.getElementById('searchBox'),
    stopFilter: document.getElementById('stopReasonFilter'),
    scoreFilter: document.getElementById('scoreFilter'),
    compareDisagreeFilter: document.getElementById('compareDisagreeFilter'),
    e2eMeta: document.getElementById('e2eMeta'),
    viewModeRow: document.getElementById('viewModeRow'),
    topbarSub: document.getElementById('topbarSub'),
    prev: document.getElementById('prevBtn'),
    next: document.getElementById('nextBtn'),
    counter: document.getElementById('counter'),
  };

  // ── Utils ──────────────────────────────────────────────────────────
  const escapeHtml = (s) =>
    String(s ?? '')
      .replace(/&/g, '&amp;')
      .replace(/</g, '&lt;')
      .replace(/>/g, '&gt;')
      .replace(/"/g, '&quot;')
      .replace(/'/g, '&#39;');

  const debounce = (fn, ms) => {
    let t;
    return (...a) => { clearTimeout(t); t = setTimeout(() => fn(...a), ms); };
  };

  const num = (x) => (x === null || x === undefined ? '—' : String(x));
  const fmtJson = (o) => {
    if (o === null || o === undefined) return '';
    try { return JSON.stringify(o, null, 2); } catch (e) { return String(o); }
  };

  function scoreClass(judgeScore, correct) {
    if (correct) return 'good';
    const j = judgeScore || 0;
    if (j >= 0.5) return 'mid';
    if (j > 0) return 'low';
    return 'zero';
  }

  function renderMarkdown(src) {
    if (typeof window.marked !== 'undefined' && window.marked && window.marked.parse) {
      try {
        return `<div class="md-body">${window.marked.parse(String(src ?? ''))}</div>`;
      } catch (e) {
        // fall through
      }
    }
    return `<pre class="md-fallback">${escapeHtml(src ?? '')}</pre>`;
  }

  // ── Filtering ──────────────────────────────────────────────────────
  function recomputeFiltered() {
    if (TRAJ_MODES.has(state.viewMode)) return recomputeFilteredE2e();
    if (state.viewMode === 'compare') return recomputeFilteredCompare();
    const m = curMode();
    const q = state.search.trim().toLowerCase();
    const filtered = [];
    for (let i = 0; i < m.index.length; i++) {
      const e = m.index[i];
      if (q) {
        const hay = (e.qid + ' ' + e.question).toLowerCase();
        if (!hay.includes(q)) continue;
      }
      filtered.push(i);
    }
    m.filtered = filtered;
  }

  function recomputeFilteredE2e() {
    const m = curMode();
    const q = state.search.trim().toLowerCase();
    const stop = state.stopReasonFilter;
    const score = state.scoreFilter;
    const filtered = [];
    for (let i = 0; i < m.index.length; i++) {
      const e = m.index[i];
      if (stop !== 'all' && e.stop_reason !== stop) continue;
      const j = e.judge_score || 0;
      if (score === 'correct' && !e.correct) continue;
      if (score === 'partial' && !(j > 0 && !e.correct)) continue;
      if (score === 'zero' && !(j === 0)) continue;
      if (q) {
        const hay = (e.qid + ' ' + e.question).toLowerCase();
        if (!hay.includes(q)) continue;
      }
      filtered.push(i);
    }
    m.filtered = filtered;
  }

  function recomputeFilteredCompare() {
    const m = modeState.compare;
    const q = state.search.trim().toLowerCase();
    const dis = state.compareDisagreeFilter;
    const filtered = [];
    for (let i = 0; i < m.index.length; i++) {
      const e = m.index[i];
      if (dis !== 'all') {
        const cells = e.cells || [];
        const allHigh = cells.length > 0 && cells.every((c) => c.correct === 1);
        const allZero = cells.length > 0 && cells.every((c) => (c.judge_score || 0) === 0);
        if (dis === 'agree_high' && !allHigh) continue;
        if (dis === 'agree_zero' && !allZero) continue;
        if (dis === 'disagree' && (allHigh || allZero)) continue;
      }
      if (q) {
        const hay = (e.qid + ' ' + e.question).toLowerCase();
        if (!hay.includes(q)) continue;
      }
      filtered.push(i);
    }
    m.filtered = filtered;
  }

  // ── Sidebar render ─────────────────────────────────────────────────
  function renderSidebar() {
    if (TRAJ_MODES.has(state.viewMode)) return renderSidebarE2e();
    if (state.viewMode === 'unified') return renderSidebarUnified();
    if (state.viewMode === 'compare') return renderSidebarCompare();
    if (E2E_STRUCT_MODES.has(state.viewMode)) return renderSidebarE2eStructures();
    return renderSidebarDataset();
  }

  function renderSidebarDataset() {
    const m = modeState.dataset;
    const html = [];
    for (const i of m.filtered) {
      const e = m.index[i];
      const sel = e.qid === m.selectedQid ? ' selected' : '';
      html.push(
        `<li class="qid-row${sel}" data-qid="${escapeHtml(e.qid)}">` +
          `<span class="qid-id">${escapeHtml(e.qid)}</span>` +
          `<span class="qid-question">${escapeHtml(e.question)}</span>` +
          `<span class="qid-row-meta">` +
            `<span class="meta-mini">docs ${num(e.n_docs)}</span>` +
            `<span class="meta-mini">ans ${num(e.n_answers)}</span>` +
          `</span>` +
        `</li>`
      );
    }
    dom.list.innerHTML = html.join('');
    updateCounter();
  }

  function renderSidebarUnified() {
    const m = modeState.unified;
    const html = [];
    for (const i of m.filtered) {
      const e = m.index[i];
      const sel = e.qid === m.selectedQid ? ' selected' : '';
      html.push(
        `<li class="qid-row${sel}" data-qid="${escapeHtml(e.qid)}">` +
          `<span class="qid-id">${escapeHtml(e.qid)}</span>` +
          `<span class="qid-question">${escapeHtml(e.question)}</span>` +
          `<span class="qid-row-meta">` +
            `<span class="meta-mini">docs ${num(e.n_docs)}</span>` +
            `<span class="meta-mini">ans ${num(e.n_answers)}</span>` +
          `</span>` +
        `</li>`
      );
    }
    dom.list.innerHTML = html.join('');
    updateCounter();
  }

  // Trajectory sidebar: judge_score pill + correct tick + stop + turns.
  function renderSidebarE2e() {
    const m = curMode();
    const html = [];
    for (const i of m.filtered) {
      const e = m.index[i];
      const sel = e.qid === m.selectedQid ? ' selected' : '';
      const j = e.judge_score || 0;
      const cls = scoreClass(j, e.correct);
      const correctPill = e.correct ? `<span class="metric-pill em">✓</span>` : '';
      const errPill = e.has_error ? `<span class="metric-pill err">ERR</span>` : '';
      const stop = e.stop_reason || '';
      const stopPill = stop ? `<span class="stop-pill stop-${stop}">${escapeHtml(stop)}</span>` : '';
      html.push(
        `<li class="qid-row${sel}" data-qid="${escapeHtml(e.qid)}">` +
          `<span class="qid-id">` +
            `<span class="metric-pill f1 ${cls}" title="LLM judge_score">${(j * 100).toFixed(0)}</span>` +
            correctPill + errPill +
            `<span class="qid-monoid">${escapeHtml(e.qid)}</span>` +
          `</span>` +
          `<span class="qid-question">${escapeHtml(e.question)}</span>` +
          `<span class="qid-row-meta">` +
            stopPill +
            (e.n_turns != null ? `<span class="meta-mini">turns ${num(e.n_turns)}</span>` : '') +
            `<span class="meta-mini">gold ${num(e.gold_answers_length)}</span>` +
          `</span>` +
        `</li>`
      );
    }
    dom.list.innerHTML = html.join('');
    updateCounter();
  }

  // Compare sidebar: sparkline of judge-score buckets per cell.
  function renderSidebarCompare() {
    const m = modeState.compare;
    const html = [];
    for (const i of m.filtered) {
      const e = m.index[i];
      const sel = e.qid === m.selectedQid ? ' selected' : '';
      const sparks = (e.cells || []).map((c) => {
        const cls = scoreClass(c.judge_score, c.correct);
        return `<span class="compare-spark ${cls}" title="${escapeHtml(c.label)} · J ${((c.judge_score || 0) * 100).toFixed(0)}${c.correct ? ' · ✓' : ''}"></span>`;
      }).join('');
      html.push(
        `<li class="qid-row${sel}" data-qid="${escapeHtml(e.qid)}">` +
          `<span class="qid-id"><span class="qid-monoid">${escapeHtml(e.qid)}</span></span>` +
          `<span class="qid-question">${escapeHtml(e.question)}</span>` +
          `<span class="qid-row-meta">` +
            `<span class="compare-spark-row">${sparks}</span>` +
            `<span class="meta-mini">gold ${num(e.gold_answers_length)}</span>` +
          `</span>` +
        `</li>`
      );
    }
    dom.list.innerHTML = html.join('');
    updateCounter();
  }

  function renderSidebarE2eStructures() {
    const m = curMode();
    const html = [];
    for (const i of m.filtered) {
      const e = m.index[i];
      const sel = e.qid === m.selectedQid ? ' selected' : '';
      html.push(
        `<li class="qid-row${sel}" data-qid="${escapeHtml(e.qid)}">` +
          `<span class="qid-id"><span class="qid-monoid">${escapeHtml(e.qid)}</span></span>` +
          `<span class="qid-question">${escapeHtml(e.question)}</span>` +
          `<span class="qid-row-meta">` +
            `<span class="meta-mini">docs ${num(e.n_docs)}</span>` +
            `<span class="meta-mini">struct ${num(e.n_structures)}</span>` +
          `</span>` +
        `</li>`
      );
    }
    dom.list.innerHTML = html.join('');
    updateCounter();
  }

  function updateCounter() {
    const m = curMode();
    const total = m.index.length;
    const shown = m.filtered.length;
    const sel = m.selectedQid;
    let pos = 0;
    if (sel) {
      const idx = m.filtered.findIndex((i) => m.index[i].qid === sel);
      pos = idx >= 0 ? idx + 1 : 0;
    }
    if (pos) {
      dom.counter.textContent = `${pos} / ${shown}` + (shown !== total ? ` (of ${total})` : '');
    } else {
      dom.counter.textContent = `${shown}` + (shown !== total ? ` of ${total}` : '');
    }
    dom.prev.disabled = !sel || pos <= 1;
    dom.next.disabled = !sel || pos >= shown;
  }

  function scrollSelectedIntoView() {
    const node = dom.list.querySelector('li.selected');
    if (node && typeof node.scrollIntoView === 'function') {
      node.scrollIntoView({ block: 'nearest' });
    }
  }

  // ── Record fetching ───────────────────────────────────────────────
  async function loadRecord(qid) {
    const m = curMode();
    if (m.cache.has(qid)) return m.cache.get(qid);
    const dir = MODES[state.viewMode].recordsDir;
    const res = await fetch(`${dir}/${encodeURIComponent(qid)}.json`);
    if (!res.ok) throw new Error(`fetch ${dir}/${qid}.json failed: ${res.status}`);
    const rec = await res.json();
    m.cache.set(qid, rec);
    return rec;
  }

  // ── Main pane render ──────────────────────────────────────────────
  function renderEmpty() {
    let msg;
    switch (state.viewMode) {
      case 'unified': msg = 'Select a question on the left to inspect its unified-bundle gold answers + supporting docs.'; break;
      case 'trajectories': msg = 'Select a question on the left to inspect the structure-per-q (Baseline A / cell 4) agent trajectory.'; break;
      case 'trajectories_corpus': msg = 'Select a question on the left to inspect the structure-per-ds (Baseline B / cell 5) agent trajectory.'; break;
      case 'trajectories_rawtext': msg = 'Select a question on the left to inspect the DCI (Baseline C / cell 6) agent trajectory.'; break;
      case 'e2e_v0': msg = 'Select a question on the left to inspect the e2e v0 pipeline trajectory (per-qid LLM judge_score).'; break;
      case 'e2e_v2': msg = 'Select a question on the left to inspect the e2e v2 pipeline trajectory (per-qid LLM judge_score).'; break;
      case 'e2e_v3': msg = 'Select a question on the left to inspect the e2e v3 pipeline trajectory (per-qid LLM judge_score).'; break;
      case 'e2e_structures_v0': msg = 'Select a question on the left to inspect its supporting doc(s) and the e2e v0 pipeline-generated structures.'; break;
      case 'e2e_structures_v2': msg = 'Select a question on the left to inspect its supporting doc(s) and the e2e v2 pipeline-generated structures.'; break;
      case 'e2e_structures_v3': msg = 'Select a question on the left to inspect its supporting doc(s) and the e2e v3 pipeline-generated structures.'; break;
      case 'compare': msg = 'Select a question on the left to see all 9 configs side-by-side (closed-book / with-docs / with-structures / structure per q / structure per ds / DCI / e2e v0 / e2e v2 / e2e v3).'; break;
      default: msg = 'Select a question on the left to begin.';
    }
    dom.main.innerHTML = `<div class="placeholder">${msg}</div>`;
  }

  function renderLoading() {
    dom.main.innerHTML = `<div class="placeholder">Loading record…</div>`;
  }

  function pickInitialBucket(rec) {
    return 'supporting';
  }

  function renderRecord(rec) {
    if (TRAJ_MODES.has(state.viewMode)) return renderTrajectoryRecord(rec);
    if (state.viewMode === 'compare') return renderCompareRecord(rec);
    if (E2E_STRUCT_MODES.has(state.viewMode)) return renderE2eStructuresRecord(rec);
    return state.viewMode === 'unified' ? renderUnifiedRecord(rec) : renderDatasetRecord(rec);
  }

  // ── Dataset rendering (monaco raw schema) ─────────────────────────
  function renderDatasetRecord(rec) {
    state.activeBucket = pickInitialBucket(rec);

    const answers = Array.isArray(rec.answers) ? rec.answers : (rec.answers ? [rec.answers] : []);
    const answersHtml = answers.length
      ? answers.map((a) => `<span class="answer-pill">${escapeHtml(String(a))}</span>`).join('')
      : `<span class="answer-pill empty">(empty)</span>`;

    const supDocs = rec.docs || [];
    const docsHtml = supDocs.length
      ? supDocs.map((d, i) => renderMonacoRawDoc(d, i + 1)).join('')
      : `<div class="empty-bucket">No supporting doc recorded for this question.</div>`;

    const html = `
      <div class="record-header">
        <div class="record-pills">
          ${rec.dataset ? `<span class="pill dataset ${escapeHtml(rec.dataset)}">${escapeHtml(rec.dataset)}</span>` : ''}
          <span class="pill mono" title="qid (ex_num)">${escapeHtml(rec.qid)}</span>
          ${rec.ex_num != null ? `<span class="pill mono" title="ex_num">ex_num=${rec.ex_num}</span>` : ''}
          <button class="copy-btn" id="copyQidBtn" title="Copy qid">📋 copy qid</button>
        </div>
        <div class="question-text">${escapeHtml(rec.question)}</div>
        <div class="answer-row">
          <span class="answer-label">Gold answer${answers.length > 1 ? 's' : ''} (${answers.length})</span>
          ${answersHtml}
        </div>
      </div>

      <div class="section">
        <h3 class="section-title">Supporting documents <span class="section-sub">(${supDocs.length} — from monaco raw <code>docs[]</code>; every entry is <code>is_supporting=true</code>)</span></h3>
        ${docsHtml}
      </div>
    `;
    dom.main.innerHTML = html;
    wireCopyBtn(rec.qid);
  }

  function renderMonacoRawDoc(d, idx) {
    const subq = d.sub_question_text ? `<div class="unified-doc-head" style="margin-top:6px"><span class="meta-mini" style="max-width:none;white-space:normal">↳ ${escapeHtml(d.sub_question_text)}</span></div>` : '';
    return `
      <div class="chunk-card hard_positive">
        <div class="chunk-head">
          <div class="chunk-bread">
            <span class="crumb-page">${escapeHtml(d.title || '(untitled)')}</span>
            ${d.section ? `<span class="crumb-sep">›</span><span class="crumb-section">${escapeHtml(d.section)}</span>` : ''}
          </div>
          <div class="chunk-meta">
            <span class="pill mono" title="doc id (matches unified eval doc.id)">📄 doc ${escapeHtml(String(d.id))}</span>
            <span>${(d.text || '').length} chars</span>
          </div>
        </div>
        ${subq}
        <div class="chunk-table-wrap">
          ${renderMarkdown(d.text || '')}
        </div>
      </div>
    `;
  }

  // ── Unified rendering ─────────────────────────────────────────────
  function renderUnifiedRecord(rec) {
    const answers = Array.isArray(rec.answers) ? rec.answers : (rec.answers ? [rec.answers] : []);
    const answersHtml = answers.length
      ? answers.map((a) => `<span class="answer-pill">${escapeHtml(String(a))}</span>`).join('')
      : `<span class="answer-pill empty">(empty)</span>`;
    const docs = rec.docs || [];
    const docsHtml = docs.length
      ? docs.map((d, i) => `
          <div class="unified-doc">
            <div class="unified-doc-head">
              <span class="unified-doc-num">[Doc ${i + 1}]</span>
              <span class="pill mono" title="doc id">id=${escapeHtml(String(d.id ?? ''))}</span>
            </div>
            ${renderMarkdown(d.contents || '')}
          </div>
        `).join('')
      : `<div class="empty-bucket">No gold supporting docs.</div>`;

    const html = `
      <div class="record-header">
        <div class="record-pills">
          <span class="pill mono" title="qid">${escapeHtml(rec.qid)}</span>
          ${rec.dataset ? `<span class="pill dataset ${escapeHtml(rec.dataset)}">${escapeHtml(rec.dataset)}</span>` : ''}
          <button class="copy-btn" id="copyQidBtn" title="Copy qid">📋 copy qid</button>
        </div>
        <div class="question-text">${escapeHtml(rec.question)}</div>
        <div class="answer-row">
          <span class="answer-label">Gold answer${answers.length > 1 ? 's' : ''} (${answers.length})</span>
          ${answersHtml}
        </div>
      </div>

      <div class="section">
        <h3 class="section-title">Gold Supporting Documents <span class="section-sub">(${docs.length})</span></h3>
        ${docsHtml}
      </div>
    `;
    dom.main.innerHTML = html;
    wireCopyBtn(rec.qid);
  }

  function wireCopyBtn(qid) {
    const copyBtn = document.getElementById('copyQidBtn');
    if (!copyBtn) return;
    copyBtn.addEventListener('click', () => {
      navigator.clipboard.writeText(qid).then(() => {
        copyBtn.textContent = '✓ copied';
        copyBtn.classList.add('copied');
        setTimeout(() => {
          copyBtn.textContent = '📋 copy qid';
          copyBtn.classList.remove('copied');
        }, 1200);
      });
    });
  }

  // ── Trajectory rendering (LLM judge scores) ────────────────────────
  function pill(label, cls) {
    return `<span class="pill ${cls || ''}">${label}</span>`;
  }

  function renderTrajectoryRecord(rec) {
    const m = rec.metrics || {};
    const j = m.judge_score ?? 0;
    const correct = m.correct ?? 0;
    const cls = scoreClass(j, correct);

    const goldHtml = (rec.gold_answers || []).map(
      (a) => `<span class="answer-pill">${escapeHtml(String(a))}</span>`
    ).join('') || `<span class="answer-pill empty">(empty)</span>`;

    const predList = rec.pred_items || [];
    const predHtml = predList.length
      ? predList.map((a) => `<span class="answer-pill pred">${escapeHtml(String(a))}</span>`).join('')
      : `<span class="answer-pill empty">(no extracted final answer)</span>`;

    const errBlock = rec.error
      ? `<div class="error-banner"><strong>Error:</strong> ${escapeHtml(rec.error.slice(0, 1200))}${rec.error.length > 1200 ? '…' : ''}</div>`
      : '';

    const tokens = rec.tokens || {};
    const metaPills = [
      rec.n_turns != null ? pill(`turns ${num(rec.n_turns)}${rec.max_turns ? '/' + rec.max_turns : ''}`, 'meta') : '',
      rec.stop_reason ? pill(`stop=${escapeHtml(rec.stop_reason)}`, `meta stop-${rec.stop_reason}`) : '',
      tokens.total_tokens != null ? pill(`tokens ${tokens.total_tokens}`, 'meta') : '',
      rec.latency_ms != null ? pill(`${(rec.latency_ms / 1000).toFixed(1)}s`, 'meta') : '',
      rec.model ? pill(escapeHtml(rec.model), 'meta mono') : '',
      rec.mode ? pill(`mode=${escapeHtml(rec.mode)}`, 'meta mono') : '',
    ].filter(Boolean).join('');

    const extractedRow = m.extracted_final_answer
      ? `<div class="answer-row"><span class="answer-label">Judge-extracted</span><span class="answer-pill pred">${escapeHtml(String(m.extracted_final_answer))}</span></div>`
      : '';

    const trajSection = (rec.events && rec.events.length)
      ? `<div class="section">
           <h3 class="section-title">Trajectory <span class="section-sub">(${rec.events.length} events · ${escapeHtml(rec.system_prompt_file || '')})</span></h3>
           <div class="trajectory">${renderEvents(rec.events)}</div>
         </div>`
      : (rec.user_prompt ? `<div class="section">
           <h3 class="section-title">Prompt <span class="section-sub">(single-turn — no trajectory)</span></h3>
           <details class="compare-sql-details"><summary>system prompt (${(rec.system_prompt || '').length} chars)</summary><pre class="raw-block">${escapeHtml(rec.system_prompt || '')}</pre></details>
           <details class="compare-sql-details" open><summary>user prompt (${(rec.user_prompt || '').length} chars)</summary><pre class="raw-block">${escapeHtml((rec.user_prompt || '').slice(0, 8000))}${(rec.user_prompt || '').length > 8000 ? '\n\n… (truncated)' : ''}</pre></details>
         </div>` : '');

    const html = `
      <div class="record-header e2e">
        <div class="record-pills">
          <span class="pill dataset monaco">${escapeHtml(rec.dataset_origin || rec.dataset || 'monaco_dev')}</span>
          <span class="pill mono" title="qid">${escapeHtml(rec.qid)}</span>
          <button class="copy-btn" id="copyQidBtn" title="Copy qid">📋 copy qid</button>
        </div>
        <div class="question-text">${escapeHtml(rec.question)}</div>

        <div class="metrics-row">
          <span class="metric-badge f1 ${cls}" title="LLM judge_score — --deterministic-extract mirror of canonical monaco protocol">J: ${(j * 100).toFixed(1)}</span>
          <span class="metric-badge ${correct ? 'good' : 'zero'}" title="1 iff judge_score ≥ 0.99">correct: ${correct}</span>
          <span class="metric-badge mid" title="judge precision (list-based)">P: ${((m.precision ?? 0) * 100).toFixed(1)}</span>
          <span class="metric-badge mid" title="judge recall (list-based)">R: ${((m.recall ?? 0) * 100).toFixed(1)}</span>
          <span class="metric-badge sep">|P|=${predList.length} · |G|=${(rec.gold_answers || []).length}</span>
        </div>

        <div class="answer-row">
          <span class="answer-label">Gold (${(rec.gold_answers || []).length})</span>
          ${goldHtml}
        </div>
        <div class="answer-row">
          <span class="answer-label">Model answer items (${predList.length})</span>
          ${predHtml}
        </div>
        ${extractedRow}

        <div class="meta-row">${metaPills}</div>
        ${errBlock}
      </div>

      <div class="section">
        <h3 class="section-title">Model's full answer <span class="section-sub">(raw text before judge extraction)</span></h3>
        <pre class="raw-block">${escapeHtml(rec.model_answer || '(empty)')}</pre>
      </div>

      ${trajSection}
    `;
    dom.main.innerHTML = html;
    wireCopyBtn(rec.qid);
  }

  function renderEvents(events) {
    if (!events.length) return `<div class="empty-bucket">No events recorded.</div>`;
    const parts = [];
    for (let i = 0; i < events.length; i++) {
      const ev = events[i];
      if (ev.type === 'tool_call') {
        const next = events[i + 1];
        const paired = next && next.type === 'tool_result' ? next : null;
        parts.push(renderToolPair(ev, paired, i));
        if (paired) i += 1;
        continue;
      }
      if (ev.type === 'tool_result') {
        parts.push(renderToolPair(null, ev, i));
        continue;
      }
      if (ev.type === 'text') {
        parts.push(`<div class="ev ev-text"><div class="ev-head">💬 assistant text</div><pre class="ev-body">${escapeHtml(ev.content || '')}</pre></div>`);
        continue;
      }
      if (ev.type === 'error') {
        parts.push(`<div class="ev ev-error"><div class="ev-head">⚠ error</div><pre class="ev-body">${escapeHtml(ev.content || '')}</pre></div>`);
        continue;
      }
      if (ev.type === 'done') {
        parts.push(`<div class="ev ev-done"><div class="ev-head">🏁 done · stop=${escapeHtml(ev.content || '?')}</div></div>`);
        continue;
      }
      parts.push(`<div class="ev"><div class="ev-head">${escapeHtml(ev.type || '?')}</div><pre class="ev-body">${escapeHtml(ev.content || '')}</pre></div>`);
    }
    return parts.join('');
  }

  function renderToolPair(call, result, idx) {
    const name = (call && call.name) || (result && result.name) || '?';
    const callBody = call
      ? `<pre class="ev-body call">${escapeHtml(fmtJson(call.input))}</pre>`
      : `<pre class="ev-body call empty">(no matching tool_call)</pre>`;
    const trunc = result && result.truncated ? ' <span class="trunc-tag">truncated</span>' : '';
    const resultBody = result
      ? `<pre class="ev-body result">${escapeHtml(result.content || '')}</pre>`
      : `<pre class="ev-body result empty">(no matching tool_result)</pre>`;
    return (
      `<div class="ev ev-tool">` +
        `<div class="ev-head">🔧 ${escapeHtml(name)}${trunc}</div>` +
        `<div class="ev-cols">` +
          `<div class="ev-col"><div class="ev-col-label">input</div>${callBody}</div>` +
          `<div class="ev-col"><div class="ev-col-label">output</div>${resultBody}</div>` +
        `</div>` +
      `</div>`
    );
  }

  function renderE2eMeta(meta) {
    if (!meta) return '';
    if (meta.n_structures_total != null) return renderE2eStructMeta(meta);
    if (meta.configs && meta.mean_metrics) {
      const cells = meta.configs.map((c) => {
        const mm = meta.mean_metrics[c] || {};
        const j = ((mm.mean_judge_score || 0) * 100).toFixed(1);
        const cor = ((mm.mean_correct || 0) * 100).toFixed(0);
        return `<span class="meta-stat" title="${escapeHtml(c)} · correct ${cor}">${escapeHtml(c)}: <strong>${j}</strong></span>`;
      }).join('');
      return `
        <div class="e2e-meta-row"><span class="meta-label">Compare</span> <span class="meta-value mono">${meta.n} qids · ${(meta.configs || []).length} configs</span></div>
        <div class="e2e-meta-row">${cells}</div>
      `;
    }
    const stops = Object.entries(meta.stop_reason_counts || {})
      .map(([k, v]) => `<span class="meta-stat">${escapeHtml(k)}: <strong>${v}</strong></span>`)
      .join('');
    return `
      <div class="e2e-meta-row"><span class="meta-label">Run</span> <span class="meta-value mono">${escapeHtml(meta.label || '')}</span></div>
      <div class="e2e-meta-row">
        <span class="meta-stat">n: <strong>${meta.n}</strong></span>
        <span class="meta-stat">J: <strong>${((meta.mean_judge_score || 0) * 100).toFixed(2)}</strong></span>
        <span class="meta-stat">✓: <strong>${((meta.mean_correct || 0) * 100).toFixed(2)}</strong></span>
        <span class="meta-stat">P: <strong>${((meta.mean_precision || 0) * 100).toFixed(2)}</strong></span>
        <span class="meta-stat">R: <strong>${((meta.mean_recall || 0) * 100).toFixed(2)}</strong></span>
        <span class="meta-stat">err: <strong>${((meta.fraction_error || 0) * 100).toFixed(2)}%</strong></span>
      </div>
      <div class="e2e-meta-row">${stops}</div>
    `;
  }

  function metaSubtitle(meta) {
    if (!meta) return '';
    if (meta.n_structures_total != null) {
      return `e2e structures · ${meta.n_qids} questions · ${meta.n_docs_unique} unique docs · ${meta.n_structures_total} structure files`;
    }
    if (meta.configs && meta.mean_metrics) {
      const cells = meta.configs.map((c) => {
        const mm = meta.mean_metrics[c] || {};
        return `${c} J ${((mm.mean_judge_score || 0) * 100).toFixed(1)}`;
      }).join(' · ');
      return `${meta.n} questions · ${cells}`;
    }
    return `${meta.label || 'agentic run'} · ${meta.n} questions · J ${((meta.mean_judge_score || 0) * 100).toFixed(2)} · ✓ ${((meta.mean_correct || 0) * 100).toFixed(2)}`;
  }

  // ── Compare record (side-by-side grid of 9 cells) ──────────────────
  function renderCompareRecord(rec) {
    const configsOrder = rec.configs_order || Object.keys(rec.configs || {});
    const configs = rec.configs || {};
    const gold = rec.gold_answers || [];

    const goldHtml = gold.length
      ? gold.map((g) => `<span class="answer-pill">${escapeHtml(String(g))}</span>`).join('')
      : `<span class="answer-pill empty">(empty)</span>`;

    let bestJ = -1;
    for (const k of configsOrder) {
      const c = configs[k];
      const j = (c && c.metrics && c.metrics.judge_score) || 0;
      if (j > bestJ) bestJ = j;
    }

    const cardHtml = configsOrder.map((label) => {
      const c = configs[label];
      if (!c) {
        return `<div class="compare-card"><div class="compare-card-hdr"><span class="compare-card-label">${escapeHtml(label)}</span></div><div class="compare-card-body empty">No response</div></div>`;
      }
      const m = c.metrics || {};
      const j = m.judge_score || 0;
      const correct = m.correct || 0;
      const cls = scoreClass(j, correct);
      const isWinner = bestJ > 0 && j === bestJ;
      const winnerCls = isWinner ? ' is-winner' : '';

      const answer = c.answer || '';
      const answerHtml = answer
        ? `<pre class="compare-card-answer">${escapeHtml(answer.length > 1500 ? answer.slice(0, 1500) + '…' : answer)}</pre>`
        : `<div class="compare-card-body empty">(empty)</div>`;

      const predItems = c.pred_items || [];
      const predPills = predItems.length
        ? predItems.map((p) => `<span class="answer-pill answer-pill-pred">${escapeHtml(String(p))}</span>`).join('')
        : `<span class="answer-pill empty">(no extracted final answer)</span>`;

      const footerPills = [];
      if (c.mode === 'agentic') {
        if (c.stop_reason) footerPills.push(`<span class="meta-mini stop-pill stop-${escapeHtml(c.stop_reason)}">stop=${escapeHtml(c.stop_reason)}</span>`);
        if (c.n_turns != null) footerPills.push(`<span class="meta-mini">turns ${c.n_turns}/${num(c.max_turns)}</span>`);
        const tc = c.tool_call_counts || {};
        const tcKeys = Object.keys(tc);
        if (tcKeys.length) {
          const txt = tcKeys.map((k) => `${k}:${tc[k]}`).join(' · ');
          footerPills.push(`<span class="meta-mini" title="tool_call_counts">${escapeHtml(txt)}</span>`);
        }
        const tk = c.tokens || {};
        if (tk.total_tokens != null) footerPills.push(`<span class="meta-mini">${tk.total_tokens} tok</span>`);
      } else {
        if (c.finish_reason) footerPills.push(`<span class="meta-mini">finish=${escapeHtml(c.finish_reason)}</span>`);
        const u = c.usage || {};
        if (u.total_tokens != null) footerPills.push(`<span class="meta-mini">${u.total_tokens} tok</span>`);
      }
      if (c.latency_ms != null) footerPills.push(`<span class="meta-mini">${(c.latency_ms / 1000).toFixed(1)}s</span>`);
      if (c.model) footerPills.push(`<span class="meta-mini mono">${escapeHtml(c.model)}</span>`);

      return `
        <div class="compare-card${winnerCls}">
          <div class="compare-card-hdr">
            <span class="compare-card-label">${escapeHtml(label)}${isWinner ? ' <span class="compare-winner-pill" title="best judge_score on this question">🏆</span>' : ''}</span>
            <span class="compare-card-metrics">
              <span class="metric-badge f1 ${cls}" title="LLM judge_score">J ${(j * 100).toFixed(0)}</span>
              <span class="metric-badge ${correct ? 'good' : 'zero'}" title="correct = judge_score ≥ 0.99">✓ ${correct}</span>
              <span class="metric-badge mid" title="judge precision">P ${((m.precision || 0) * 100).toFixed(0)}</span>
              <span class="metric-badge mid" title="judge recall">R ${((m.recall || 0) * 100).toFixed(0)}</span>
            </span>
          </div>
          <div class="compare-card-preds">
            <span class="compare-card-sublabel">Extracted (${predItems.length}):</span>
            ${predPills}
          </div>
          ${answerHtml}
          <div class="compare-card-footer">${footerPills.join('')}</div>
        </div>
      `;
    }).join('');

    const html = `
      <div class="record-header e2e">
        <div class="record-pills">
          <span class="pill dataset monaco">monaco_dev</span>
          <span class="pill mono" title="qid">${escapeHtml(rec.qid)}</span>
          <button class="copy-btn" id="copyQidBtn" title="Copy qid">📋 copy qid</button>
        </div>
        <div class="question-text">${escapeHtml(rec.question)}</div>
        <div class="answer-row">
          <span class="answer-label">Gold (${gold.length})</span>
          ${goldHtml}
        </div>
      </div>

      <div class="section">
        <h3 class="section-title">All ${configsOrder.length} cells <span class="section-sub">side-by-side · LLM judge_score / correct / P / R (canonical --deterministic-extract judge)</span></h3>
        <div class="compare-grid">${cardHtml}</div>
      </div>
    `;
    dom.main.innerHTML = html;
    wireCopyBtn(rec.qid);
  }

  // ── e2e structures record (supporting docs + per-shape structure files) ─
  const SHAPE_ICON = {
    tabular_records: '📊',
    chronology_and_timeline_indexes: '🕒',
    claim_and_theme_summaries: '💬',
    qa_shortcuts_and_templates: '❓',
    relation_graphs_and_mappings: '🕸',
  };

  function renderE2eStructMeta(meta) {
    if (!meta) return '';
    const shapeRows = (meta.shapes || []).map((s) => {
      const desc = (meta.shape_descriptions || {})[s] || '';
      const icon = SHAPE_ICON[s] || '🧩';
      return `<div class="e2e-meta-row"><span class="meta-label mono">${icon} ${escapeHtml(s)}</span> <span class="meta-stat" title="${escapeHtml(desc)}">${escapeHtml(desc.slice(0, 80))}${desc.length > 80 ? '…' : ''}</span></div>`;
    }).join('');
    return `
      <div class="e2e-meta-row"><span class="meta-label">E2E Structures</span> <span class="meta-value mono">${escapeHtml(meta.label || '')}</span></div>
      <div class="e2e-meta-row">
        <span class="meta-stat">qids: <strong>${meta.n_qids}</strong></span>
        <span class="meta-stat">unique docs: <strong>${meta.n_docs_unique}</strong></span>
        <span class="meta-stat" title="files where the e2e pipeline emitted at least one shape">structures: <strong>${meta.n_structures_total}</strong></span>
        <span class="meta-stat" title="avg structures per qid">avg/qid: <strong>${meta.n_structures_avg_per_qid}</strong></span>
      </div>
      ${shapeRows}
    `;
  }

  function renderE2eStructuresRecord(rec) {
    const goldHtml = (rec.gold_answers || []).map(
      (a) => `<span class="answer-pill">${escapeHtml(String(a))}</span>`
    ).join('') || `<span class="answer-pill empty">(empty)</span>`;

    const docs = rec.docs || [];
    const docsHtml = docs.length
      ? docs.map((d) => renderE2eStructDoc(d)).join('')
      : `<div class="empty-bucket">No supporting docs recorded for this question.</div>`;

    const html = `
      <div class="record-header">
        <div class="record-pills">
          <span class="pill dataset monaco">monaco_dev</span>
          <span class="pill mono" title="qid">${escapeHtml(rec.qid)}</span>
          <span class="pill mono" title="number of supporting docs · total e2e structure files">📄 ${rec.n_docs} doc · 🏗 ${rec.n_structures} struct</span>
          <button class="copy-btn" id="copyQidBtn" title="Copy qid">📋 copy qid</button>
        </div>
        <div class="question-text">${escapeHtml(rec.question)}</div>
        <div class="answer-row">
          <span class="answer-label">Gold answer${(rec.gold_answers || []).length > 1 ? 's' : ''} (${(rec.gold_answers || []).length})</span>
          ${goldHtml}
        </div>
      </div>

      <div class="section">
        <h3 class="section-title">📄 Supporting doc${docs.length > 1 ? 's' : ''} + 🏗 E2E-pipeline structures
          <span class="section-sub">(5 shapes: tabular_records, chronology_and_timeline_indexes, claim_and_theme_summaries, qa_shortcuts_and_templates, relation_graphs_and_mappings)</span>
        </h3>
        ${docsHtml}
      </div>
    `;
    dom.main.innerHTML = html;
    wireCopyBtn(rec.qid);
  }

  function renderE2eStructDoc(d) {
    const supportBadge = d.is_supporting
      ? `<span class="pill" style="background:#dcecdc;color:#1f5a32;border-color:#b9d4b9" title="This doc is in the qid's gold supporting-docs list">✓ supporting</span>`
      : `<span class="pill" style="background:#f3eedb;color:var(--ink-mute)">distractor</span>`;
    const structs = d.structures || [];
    const structsHtml = structs.length
      ? structs.map((s) => renderE2eStructItem(s, d.doc_id)).join('')
      : `<div class="empty-bucket">No e2e structures were extracted from this doc.</div>`;

    return `
      <div class="e2estruct-doc">
        <div class="e2estruct-doc-head">
          <span class="pill mono" title="doc id">📄 doc ${escapeHtml(String(d.doc_id))}</span>
          ${supportBadge}
          <span class="pill mono" style="background:#f6e9e0;color:#7a4a1d;border-color:#e9c9a6">🏗 ${structs.length} structure file${structs.length === 1 ? '' : 's'}</span>
        </div>
        <details class="e2estruct-doc-source" open>
          <summary class="e2estruct-summary"><span>📖 source document</span><span class="meta-mini">${(d.contents || '').length} chars</span></summary>
          <div class="e2estruct-doc-body">${renderMarkdown(d.contents || '')}</div>
        </details>
        <div class="e2estruct-structs">${structsHtml}</div>
      </div>
    `;
  }

  function renderE2eStructItem(s, docId) {
    const icon = SHAPE_ICON[s.shape_id] || '🧩';
    const body = renderStructContent(s.format, s.content || '');
    return `
      <details class="e2estruct-card e2estruct-${escapeHtml(s.shape_id)}" open>
        <summary class="e2estruct-summary">
          <span>${icon} <span class="mono">${escapeHtml(s.shape_id)}</span></span>
          <span class="meta-mini mono">${escapeHtml(s.file)}</span>
          <span class="meta-mini">${escapeHtml(s.format)}</span>
        </summary>
        ${s.description ? `<div class="e2estruct-desc">${escapeHtml(s.description)}</div>` : ''}
        <div class="e2estruct-body">${body}</div>
      </details>
    `;
  }

  function renderStructContent(fmt, content) {
    if (!content) return `<div class="empty-bucket">(empty file)</div>`;
    if (fmt === 'csv') return renderCsvAsTable(content);
    if (fmt === 'jsonl') return renderJsonl(content);
    if (fmt === 'json') {
      try {
        const parsed = JSON.parse(content);
        return `<pre class="e2estruct-pre">${escapeHtml(JSON.stringify(parsed, null, 2))}</pre>`;
      } catch (e) {
        return `<pre class="e2estruct-pre">${escapeHtml(content)}</pre>`;
      }
    }
    if (fmt === 'md') return renderMarkdown(content);
    return `<pre class="e2estruct-pre">${escapeHtml(content)}</pre>`;
  }

  function parseCsv(text) {
    const rows = [];
    let row = [];
    let cell = '';
    let inQuote = false;
    let i = 0;
    while (i < text.length) {
      const c = text[i];
      if (inQuote) {
        if (c === '"') {
          if (text[i + 1] === '"') { cell += '"'; i += 2; continue; }
          inQuote = false; i++; continue;
        }
        cell += c; i++; continue;
      }
      if (c === '"') { inQuote = true; i++; continue; }
      if (c === ',') { row.push(cell); cell = ''; i++; continue; }
      if (c === '\n') { row.push(cell); rows.push(row); row = []; cell = ''; i++; continue; }
      if (c === '\r') { i++; continue; }
      cell += c; i++;
    }
    if (cell.length > 0 || row.length > 0) { row.push(cell); rows.push(row); }
    return rows;
  }

  function renderCsvAsTable(text) {
    const rows = parseCsv(text);
    if (!rows.length) return `<pre class="e2estruct-pre">${escapeHtml(text)}</pre>`;
    const head = rows[0];
    const body = rows.slice(1);
    const headHtml = head.map((h) => `<th>${escapeHtml(h)}</th>`).join('');
    const bodyHtml = body
      .filter((r) => r.length && !(r.length === 1 && r[0] === ''))
      .map((r) => `<tr>${r.map((c) => `<td>${escapeHtml(c)}</td>`).join('')}</tr>`)
      .join('');
    return `
      <div class="e2estruct-table-wrap">
        <table class="e2estruct-table">
          <thead><tr>${headHtml}</tr></thead>
          <tbody>${bodyHtml}</tbody>
        </table>
      </div>
    `;
  }

  function renderJsonl(text) {
    const lines = text.split('\n').map((l) => l.trim()).filter(Boolean);
    if (!lines.length) return `<div class="empty-bucket">(empty)</div>`;
    const items = lines.map((line) => {
      let parsed;
      try { parsed = JSON.parse(line); } catch (e) { parsed = null; }
      if (parsed && typeof parsed === 'object' && !Array.isArray(parsed)) {
        const rows = Object.entries(parsed).map(([k, v]) => {
          const vstr = (v === null || v === undefined) ? '∅' :
                       (typeof v === 'string') ? v :
                       JSON.stringify(v);
          return `<div class="jsonl-row"><span class="jsonl-key">${escapeHtml(k)}</span><span class="jsonl-val">${escapeHtml(vstr)}</span></div>`;
        }).join('');
        return `<div class="jsonl-card">${rows}</div>`;
      }
      return `<pre class="e2estruct-pre">${escapeHtml(line)}</pre>`;
    }).join('');
    return `<div class="jsonl-list">${items}</div>`;
  }

  // ── Selection / nav ───────────────────────────────────────────────
  async function selectQid(qid, pushHash = true) {
    const m = curMode();
    m.selectedQid = qid;
    renderSidebar();
    scrollSelectedIntoView();
    if (pushHash) {
      const h = `#${state.viewMode}:${encodeURIComponent(qid)}`;
      if (window.location.hash !== h) window.history.replaceState(null, '', h);
    }
    renderLoading();
    try {
      const rec = await loadRecord(qid);
      if (m.selectedQid !== qid) return;
      renderRecord(rec);
    } catch (e) {
      dom.main.innerHTML = `<div class="placeholder">Failed to load record: ${escapeHtml(e.message)}</div>`;
    }
  }

  function step(delta) {
    const m = curMode();
    if (!m.selectedQid) {
      if (m.filtered.length) selectQid(m.index[m.filtered[0]].qid);
      return;
    }
    const cur = m.filtered.findIndex((i) => m.index[i].qid === m.selectedQid);
    if (cur < 0) return;
    const next = cur + delta;
    if (next < 0 || next >= m.filtered.length) return;
    selectQid(m.index[m.filtered[next]].qid);
  }

  // ── Mode switching ────────────────────────────────────────────────
  async function setViewMode(mode) {
    if (!MODES[mode] || mode === state.viewMode) return;
    state.viewMode = mode;
    dom.viewModeRow.querySelectorAll('.view-mode-btn').forEach((b) => {
      const on = b.getAttribute('data-view-mode') === mode;
      b.classList.toggle('active', on);
      b.setAttribute('aria-selected', on ? 'true' : 'false');
    });
    document.querySelectorAll('[data-show-in]').forEach((el) => {
      const want = (el.getAttribute('data-show-in') || '').split(/\s+/).filter(Boolean);
      el.hidden = !want.includes(mode);
    });
    renderEmpty();
    await ensureIndexLoaded(mode);
    dom.topbarSub.textContent = MODES[mode].topbarSub || metaSubtitle(modeState[mode].meta);
    if ((TRAJ_MODES.has(mode) || mode === 'compare' || E2E_STRUCT_MODES.has(mode)) && modeState[mode].meta && dom.e2eMeta) {
      dom.e2eMeta.innerHTML = renderE2eMeta(modeState[mode].meta);
    }
    recomputeFiltered();
    renderSidebar();
    const sel = curMode().selectedQid;
    if (sel) {
      selectQid(sel, /*pushHash=*/false);
    } else if (curMode().filtered.length) {
      renderEmpty();
    } else {
      dom.main.innerHTML = `<div class="placeholder">No items in this view.</div>`;
    }
  }

  async function ensureIndexLoaded(mode) {
    const m = modeState[mode];
    if (m.index.length) return;
    const url = MODES[mode].indexUrl;
    const res = await fetch(url);
    if (!res.ok) throw new Error(`fetch ${url} failed: ${res.status}`);
    const payload = await res.json();
    if (MODES[mode].indexShape === 'wrapped') {
      m.meta = payload.meta || null;
      m.index = payload.rows || [];
    } else {
      m.index = Array.isArray(payload) ? payload : (payload.rows || []);
    }
  }

  // ── Wiring ────────────────────────────────────────────────────────
  function wire() {
    dom.list.addEventListener('click', (ev) => {
      const li = ev.target.closest('li.qid-row');
      if (li) selectQid(li.getAttribute('data-qid'));
    });

    dom.search.addEventListener('input', debounce(() => {
      state.search = dom.search.value;
      recomputeFiltered();
      renderSidebar();
    }, 120));

    dom.viewModeRow.addEventListener('click', (ev) => {
      const btn = ev.target.closest('.view-mode-btn');
      if (!btn) return;
      const mode = btn.getAttribute('data-view-mode');
      setViewMode(mode).catch((e) => {
        dom.main.innerHTML = `<div class="placeholder">Failed to switch mode: ${escapeHtml(e.message)}</div>`;
      });
    });

    if (dom.stopFilter) {
      dom.stopFilter.addEventListener('click', (ev) => {
        const btn = ev.target.closest('.filter-pill');
        if (!btn) return;
        const v = btn.getAttribute('data-stop');
        if (v === state.stopReasonFilter) return;
        state.stopReasonFilter = v;
        dom.stopFilter.querySelectorAll('.filter-pill').forEach((b) => b.classList.toggle('active', b === btn));
        recomputeFiltered();
        renderSidebar();
      });
    }

    if (dom.scoreFilter) {
      dom.scoreFilter.addEventListener('click', (ev) => {
        const btn = ev.target.closest('.filter-pill');
        if (!btn) return;
        const v = btn.getAttribute('data-score');
        if (v === state.scoreFilter) return;
        state.scoreFilter = v;
        dom.scoreFilter.querySelectorAll('.filter-pill').forEach((b) => b.classList.toggle('active', b === btn));
        recomputeFiltered();
        renderSidebar();
      });
    }

    if (dom.compareDisagreeFilter) {
      dom.compareDisagreeFilter.addEventListener('click', (ev) => {
        const btn = ev.target.closest('.filter-pill');
        if (!btn) return;
        const v = btn.getAttribute('data-disagree');
        if (v === state.compareDisagreeFilter) return;
        state.compareDisagreeFilter = v;
        dom.compareDisagreeFilter.querySelectorAll('.filter-pill').forEach((b) => b.classList.toggle('active', b === btn));
        recomputeFiltered();
        renderSidebar();
      });
    }

    dom.prev.addEventListener('click', () => step(-1));
    dom.next.addEventListener('click', () => step(+1));

    document.addEventListener('keydown', (ev) => {
      if (ev.target && (ev.target.tagName === 'INPUT' || ev.target.tagName === 'TEXTAREA')) {
        if (ev.key === 'Escape') ev.target.blur();
        return;
      }
      if (ev.key === 'ArrowLeft') { ev.preventDefault(); step(-1); }
      else if (ev.key === 'ArrowRight') { ev.preventDefault(); step(+1); }
      else if (ev.key === '/') { ev.preventDefault(); dom.search.focus(); dom.search.select(); }
    });

    window.addEventListener('hashchange', () => {
      const parsed = parseHash(window.location.hash);
      if (!parsed) return;
      if (parsed.mode !== state.viewMode) {
        setViewMode(parsed.mode).then(() => {
          if (parsed.qid && parsed.qid !== curMode().selectedQid) selectQid(parsed.qid, /*pushHash=*/false);
        });
      } else if (parsed.qid && parsed.qid !== curMode().selectedQid) {
        selectQid(parsed.qid, /*pushHash=*/false);
      }
    });
  }

  function parseHash(hash) {
    const s = (hash || '').replace(/^#/, '');
    if (!s) return null;
    if (s.includes(':')) {
      const [mode, ...rest] = s.split(':');
      if (MODES[mode]) return { mode, qid: decodeURIComponent(rest.join(':')) };
    }
    return { mode: 'dataset', qid: decodeURIComponent(s) };
  }

  // ── Boot ──────────────────────────────────────────────────────────
  async function boot() {
    wire();
    dom.main.innerHTML = `<div class="placeholder">Loading index…</div>`;

    const parsed = parseHash(window.location.hash);
    const initialMode = (parsed && MODES[parsed.mode]) ? parsed.mode : 'dataset';

    try {
      await ensureIndexLoaded('dataset');
    } catch (e) {
      dom.main.innerHTML = `<div class="placeholder">Failed to load index.json: ${escapeHtml(e.message)}</div>`;
      return;
    }

    if (initialMode === 'dataset') {
      recomputeFiltered();
      renderSidebar();
    } else {
      try {
        await setViewMode(initialMode);
      } catch (e) {
        dom.main.innerHTML = `<div class="placeholder">Failed to load ${escapeHtml(initialMode)} index: ${escapeHtml(e.message)}</div>`;
        return;
      }
    }

    if (parsed && parsed.qid) {
      const m = curMode();
      if (m.index.some((e) => e.qid === parsed.qid)) {
        selectQid(parsed.qid, /*pushHash=*/false);
        return;
      }
    }
    renderEmpty();
  }

  boot();
})();