const state = {
  activeTool: 'ask',
  authenticated: Boolean(window.DBN_TOOLS_AUTHENTICATED),
};

let lastTimelineEvents = [];
let lastAudioFile = null;
let lastTranscriptData = null;

const tools = {
  ask: {
    kind: 'Source-grounded Legal Ask',
    title: 'Ask a legal question',
    label: 'Question',
    endpoint: 'api/ask.php',
    payloadKey: 'question',
    placeholder: 'Example: What evidence is needed before asking for changes in custody arrangements?',
    usesLanguage: true,
    badge: 'family-legal',
  },
  search: {
    kind: 'Legal Source Search',
    title: 'Search legal sources',
    label: 'Search query',
    endpoint: 'api/search.php',
    payloadKey: 'query',
    placeholder: 'Example: barnets beste samvær foreldreansvar',
    usesLanguage: true,
    badge: 'family-legal',
  },
  summarize: {
    kind: 'Document Summarizer',
    title: 'Summarize pasted text',
    label: 'Pasted text',
    endpoint: 'api/summarize.php',
    payloadKey: 'text',
    placeholder: 'Paste a case note, letter, or excerpt.',
    usesLanguage: true,
    badge: 'process-and-forget',
  },
  timeline: {
    kind: 'Timeline Builder',
    title: 'Build a timeline',
    label: 'Pasted text',
    endpoint: 'api/timeline.php',
    payloadKey: 'text',
    placeholder: 'Paste case notes with dates, actors, and events.',
    usesLanguage: true,
    badge: 'process-and-forget',
  },
  redact: {
    kind: 'Redaction Assistant',
    title: 'Redact sensitive details',
    label: 'Pasted text',
    endpoint: 'api/redact.php',
    payloadKey: 'text',
    placeholder: 'Paste text containing names, phone numbers, emails, addresses, or fødselsnummer-like values.',
    usesLanguage: false,
    badge: 'deterministic first',
  },
  transcribe: {
    kind: 'Audio Transcription',
    title: 'Transcribe audio',
    label: 'Audio file',
    endpoint: 'api/transcribe.php',
    payloadKey: null,
    placeholder: '',
    usesLanguage: false,
    badge: 'Whisper / GPU',
  },
};

const els = {};

document.addEventListener('DOMContentLoaded', () => {
  Object.assign(els, {
    gate: document.querySelector('#publicLanding'),
    app: document.querySelector('#appShell'),
    passcodeForm: document.querySelector('#passcodeForm'),
    loginEmail: document.querySelector('#loginEmail'),
    loginPassword: document.querySelector('#loginPassword'),
    gateStatus: document.querySelector('#gateStatus'),
    tabs: Array.from(document.querySelectorAll('.tool-tab')),
    toolKind: document.querySelector('#toolKind'),
    toolTitle: document.querySelector('#toolTitle'),
    toolBadge: document.querySelector('#toolBadge'),
    form: document.querySelector('#toolForm'),
    inputLabel: document.querySelector('#inputLabel'),
    input: document.querySelector('#toolInput'),
    languageControl: document.querySelector('#languageControl'),
    redactionControl: document.querySelector('#redactionControl'),
    status: document.querySelector('#toolStatus'),
    results: document.querySelector('#results'),
    traceList: document.querySelector('#traceList'),
    healthButton: document.querySelector('#healthButton'),
    healthPill: document.querySelector('#healthPill'),
    uploadZone: document.querySelector('#uploadZone'),
    uploadInput: document.querySelector('#uploadInput'),
    uploadPrompt: document.querySelector('#uploadPrompt'),
    uploadFileInfo: document.querySelector('#uploadFileInfo'),
    uploadFileList: document.querySelector('#uploadFileList'),
    uploadClear: document.querySelector('#uploadClear'),
    aliasSection: document.querySelector('#aliasSection'),
    addAliasRow: document.querySelector('#addAliasRow'),
    aliasRows: document.querySelector('#aliasRows'),
    audioZone: document.querySelector('#audioZone'),
    audioInput: document.querySelector('#audioInput'),
    audioPrompt: document.querySelector('#audioPrompt'),
    audioFileInfo: document.querySelector('#audioFileInfo'),
    audioFileName: document.querySelector('#audioFileName'),
    audioFileSize: document.querySelector('#audioFileSize'),
    audioClear: document.querySelector('#audioClear'),
    diarizeControl: document.querySelector('#diarizeControl'),
    diarizeCheck: document.querySelector('#diarizeCheck'),
    numSpeakersInput: document.querySelector('#numSpeakersInput'),
    transcribeLangControl: document.querySelector('#transcribeLangControl'),
  });

  els.tabs.forEach((tab) => {
    if (tab.tagName !== 'A') {
      tab.addEventListener('click', () => setTool(tab.dataset.tool));
    }
  });
  els.form?.addEventListener('submit', runTool);
  els.passcodeForm?.addEventListener('submit', submitPasscode);
  els.healthButton.addEventListener('click', checkHealth);
  setupUpload();
  setupAliases();
  setupAudio();
  setupTranscribeControls();
  els.results.addEventListener('click', (e) => {
    if (e.target.closest('#exportCsvBtn')) exportTimelineCSV(lastTimelineEvents);
    if (e.target.closest('#dlTxt')) downloadTranscriptTxt();
    if (e.target.closest('#dlSrt')) downloadTranscriptSrt();
    if (e.target.closest('#dlVtt')) downloadTranscriptVtt();
  });
  const activeTool = document.body.dataset.activeTool || state.activeTool;
  setTool(activeTool);

  if (state.authenticated) {
    checkHealth();
  } else {
    els.loginEmail?.focus();
  }
});

function setTool(toolName) {
  state.activeTool = toolName;
  const tool = tools[toolName];
  els.tabs.forEach((button) => {
    const active = button.dataset.tool === toolName;
    button.classList.toggle('is-active', active);
    button.setAttribute('aria-pressed', String(active));
  });

  els.toolKind.textContent = tool.kind;
  els.toolTitle.textContent = tool.title;
  els.toolBadge.textContent = tool.badge;
  els.inputLabel.textContent = tool.label;
  els.input.value = '';
  els.input.placeholder = tool.placeholder;
  els.languageControl.classList.toggle('is-hidden', !tool.usesLanguage);
  els.redactionControl.classList.toggle('is-hidden', toolName !== 'redact');
  els.uploadZone.classList.toggle('is-hidden', toolName !== 'redact' && toolName !== 'timeline');
  els.aliasSection.classList.toggle('is-hidden', toolName !== 'redact');
  els.audioZone.classList.toggle('is-hidden', toolName !== 'transcribe');
  els.diarizeControl.classList.toggle('is-hidden', toolName !== 'transcribe');
  els.transcribeLangControl.classList.toggle('is-hidden', toolName !== 'transcribe');
  els.input.classList.toggle('is-hidden', toolName === 'transcribe');
  els.inputLabel.classList.toggle('is-hidden', toolName === 'transcribe');
  els.input.required = toolName !== 'transcribe';
  resetUpload();
  resetAliases();
  resetAudio();
  els.status.textContent = '';
  renderTrace([]);
}

async function submitPasscode(event) {
  event.preventDefault();
  els.gateStatus.textContent = 'Signing in…';
  try {
    const data = await postJson('api/session.php', {
      email: els.loginEmail.value.trim(),
      password: els.loginPassword.value,
    });
    if (!data.ok) {
      throw new Error(data.error?.message || 'Credentials were not accepted.');
    }
    state.authenticated = true;
    els.gate.classList.add('is-hidden');
    els.app.classList.remove('is-hidden');
    els.loginPassword.value = '';
    els.healthPill.textContent = 'Session active';
    checkHealth();
    els.input.focus();
  } catch (error) {
    els.gateStatus.textContent = error.message;
  }
}

async function runTool(event) {
  event.preventDefault();

  if (state.activeTool === 'transcribe') {
    await runTranscribe();
    return;
  }

  const tool = tools[state.activeTool];
  const text = els.input.value.trim();
  if (!text) {
    els.status.textContent = 'Add text before running the tool.';
    els.input.focus();
    return;
  }

  const payload = { [tool.payloadKey]: text };
  if (tool.usesLanguage) {
    payload.language = currentLanguage();
  }
  if (state.activeTool === 'search') {
    payload.limit = 7;
  }
  if (state.activeTool === 'redact') {
    payload.mode = currentRedactionMode();
    payload.region = currentRedactionRegion();
    payload.aliases = getAliases();
  }

  setBusy(true);
  renderTrace([
    { label: 'Query interpretation', detail: 'Preparing request.', status: 'running' },
  ]);

  try {
    const data = await postJson(tool.endpoint, payload);
    if (!data.ok) {
      throw new Error(data.error?.message || 'Tool request failed.');
    }
    renderResults(data);
    renderTrace(data.trace || []);
    els.status.textContent = `Done in ${data.latency_ms || 0} ms.`;
  } catch (error) {
    els.status.textContent = error.message;
    renderTrace([
      { label: 'Tool error', detail: error.message, status: 'warning' },
    ]);
  } finally {
    setBusy(false);
  }
}

function resetUpload() {
  if (!els.uploadInput) return;
  els.uploadInput.value = '';
  els.uploadPrompt.classList.remove('is-hidden');
  els.uploadFileInfo.classList.add('is-hidden');
  els.uploadFileList.innerHTML = '';
  els.uploadZone.classList.remove('is-drag-over');
}

function setupUpload() {
  els.uploadZone.addEventListener('dragover', (e) => {
    e.preventDefault();
    els.uploadZone.classList.add('is-drag-over');
  });

  els.uploadZone.addEventListener('dragleave', (e) => {
    if (!els.uploadZone.contains(e.relatedTarget)) {
      els.uploadZone.classList.remove('is-drag-over');
    }
  });

  els.uploadZone.addEventListener('drop', (e) => {
    e.preventDefault();
    els.uploadZone.classList.remove('is-drag-over');
    if (e.dataTransfer?.files?.length) handleFiles(e.dataTransfer.files);
  });

  els.uploadZone.addEventListener('click', (e) => {
    if (e.target === els.uploadClear || els.uploadClear?.contains(e.target)) return;
    if (e.target.tagName === 'LABEL') return;
    els.uploadInput.click();
  });

  els.uploadInput.addEventListener('change', () => {
    if (els.uploadInput.files?.length) handleFiles(els.uploadInput.files);
  });

  els.uploadClear.addEventListener('click', () => {
    resetUpload();
    els.input.value = '';
    els.status.textContent = '';
  });
}

async function handleFiles(fileList) {
  const allowed = ['pdf', 'docx', 'txt'];
  const files = Array.from(fileList).slice(0, 5);

  for (const file of files) {
    const ext = file.name.split('.').pop().toLowerCase();
    if (!allowed.includes(ext)) {
      els.status.textContent = `Skipped ${file.name}: unsupported type. Use .pdf, .docx, or .txt.`;
      return;
    }
  }

  els.status.textContent = files.length === 1 ? `Extracting ${files[0].name}…` : `Extracting ${files.length} files…`;
  setBusy(true);

  const parts = [];
  let totalChars = 0;
  let anyTruncated = false;

  try {
    for (const file of files) {
      const formData = new FormData();
      formData.append('file', file);

      const resp = await fetch('api/extract.php', {
        method: 'POST',
        credentials: 'same-origin',
        body: formData,
      });
      const data = await resp.json().catch(() => ({}));

      if (!resp.ok || !data.ok) {
        throw new Error(data.error?.message || `Extraction failed for ${file.name} (HTTP ${resp.status}).`);
      }

      parts.push({ filename: file.name, chars: data.chars, truncated: data.truncated, text: data.text });
      totalChars += data.chars;
      if (data.truncated) anyTruncated = true;
    }

    const combined = parts.length === 1
      ? parts[0].text
      : parts.map((p) => `--- Document: ${p.filename} ---\n\n${p.text}`).join('\n\n');

    const MAX_COMBINED = 128000;
    const combinedTruncated = combined.length > MAX_COMBINED;
    els.input.value = combinedTruncated ? combined.slice(0, MAX_COMBINED) : combined;

    els.uploadFileList.innerHTML = parts
      .map((p) => `<li><span class="upload-filename">${escapeHtml(p.filename)}</span><span class="upload-chars">${p.chars.toLocaleString()} chars${p.truncated ? ' • per-file limit reached' : ''}</span></li>`)
      .join('');
    els.uploadPrompt.classList.add('is-hidden');
    els.uploadFileInfo.classList.remove('is-hidden');

    const truncNote = (anyTruncated || combinedTruncated) ? ' — truncated to 128 000 char limit' : '';
    els.status.textContent = parts.length === 1
      ? `Extracted ${totalChars.toLocaleString()} chars from ${parts[0].filename}${truncNote}.`
      : `Extracted ${totalChars.toLocaleString()} chars total from ${parts.length} files${truncNote}.`;
  } catch (err) {
    els.status.textContent = err.message;
    resetUpload();
  } finally {
    setBusy(false);
  }
}

function setupAliases() {
  els.addAliasRow.addEventListener('click', () => {
    const row = document.createElement('div');
    row.className = 'alias-row';
    row.innerHTML = [
      '<input type="text" class="alias-original" placeholder="Real name" maxlength="100">',
      '<span class="alias-arrow" aria-hidden="true">→</span>',
      '<input type="text" class="alias-label" placeholder="Alias (without brackets)" maxlength="100">',
      '<button type="button" class="alias-remove" aria-label="Remove alias">×</button>',
    ].join('');
    els.aliasRows.appendChild(row);
    row.querySelector('.alias-original').focus();
  });

  els.aliasRows.addEventListener('click', (e) => {
    const btn = e.target.closest('.alias-remove');
    if (btn) btn.closest('.alias-row').remove();
  });
}

function getAliases() {
  return Array.from(els.aliasRows.querySelectorAll('.alias-row')).flatMap((row) => {
    const original = row.querySelector('.alias-original')?.value.trim() ?? '';
    const alias = row.querySelector('.alias-label')?.value.trim() ?? '';
    return original && alias ? [{ original, alias }] : [];
  });
}

function resetAliases() {
  if (els.aliasRows) els.aliasRows.innerHTML = '';
}

async function checkHealth() {
  els.healthPill.textContent = 'Checking...';
  try {
    const response = await fetch('api/health.php', {
      method: 'GET',
      headers: { Accept: 'application/json' },
      credentials: 'same-origin',
    });
    const data = await response.json();
    els.healthPill.textContent = data.ok ? 'Healthy' : 'Needs config';
    els.healthPill.classList.toggle('is-warning', !data.ok);
    if (!data.ok && data.checks) {
      renderHealth(data);
    }
  } catch (error) {
    els.healthPill.textContent = 'Health failed';
    els.healthPill.classList.add('is-warning');
  }
}

async function postJson(url, payload) {
  const response = await fetch(url, {
    method: 'POST',
    headers: {
      Accept: 'application/json',
      'Content-Type': 'application/json',
    },
    credentials: 'same-origin',
    body: JSON.stringify(payload),
  });
  const data = await response.json().catch(() => ({}));
  if (!response.ok) {
    throw new Error(data.error?.message || `Request failed with HTTP ${response.status}.`);
  }
  return data;
}

function setBusy(isBusy) {
  const button = document.querySelector('#runButton');
  button.disabled = isBusy;
  button.textContent = isBusy
    ? (state.activeTool === 'transcribe' ? 'Transcribing...' : 'Running...')
    : 'Run Tool';
}

function currentLanguage() {
  return document.querySelector('input[name="language"]:checked')?.value || 'en';
}

function currentRedactionMode() {
  return document.querySelector('input[name="redactionMode"]:checked')?.value || 'standard';
}

function currentRedactionRegion() {
  return document.querySelector('input[name="redactionRegion"]:checked')?.value || 'nordic';
}

function renderResults(data) {
  const sections = [];
  sections.push(sectionHtml('What We Found', renderMainFinding(data)));
  sections.push(sectionHtml('Evidence Trail', renderEvidence(data)));
  sections.push(sectionHtml('What Remains Uncertain', renderListish(data.what_remains_uncertain)));
  sections.push(sectionHtml('Next Practical Step', `<p>${escapeHtml(data.next_practical_step || 'Review the evidence trail.')}</p>`));

  if (data.disclaimer) {
    sections.push(`<p class="result-disclaimer">${escapeHtml(data.disclaimer)}</p>`);
  }

  els.results.innerHTML = sections.join('');
}

function renderMainFinding(data) {
  if (data.tool === 'ask') {
    return `<p class="answer">${escapeHtml(data.answer || data.what_we_found || '')}</p>`;
  }
  if (data.tool === 'redact') {
    return `<pre class="redacted-output">${escapeHtml(data.redacted_text || '')}</pre>${renderEntityCounts(data.entity_counts)}`;
  }
  if (data.tool === 'timeline') {
    lastTimelineEvents = data.events || [];
    const csvBtn = lastTimelineEvents.length
      ? `<div class="timeline-export"><button type="button" id="exportCsvBtn" class="export-csv-btn">Download CSV</button></div>`
      : '';
    return `<p>${escapeHtml(data.what_we_found || '')}</p>${renderTimeline(lastTimelineEvents)}${csvBtn}`;
  }
  if (data.tool === 'summarize') {
    return [
      `<p>${escapeHtml(data.what_we_found || '')}</p>`,
      detailList('Key Facts', data.key_facts),
      detailList('Dates', data.dates),
      detailList('Parties', data.parties),
      detailList('Legal References Detected', data.legal_references_detected),
    ].join('');
  }
  if (data.tool === 'search') {
    return `<p>${escapeHtml(data.what_we_found || '')}</p>`;
  }
  return `<p>${escapeHtml(data.what_we_found || '')}</p>`;
}

function currentTranscribeLang() {
  return document.querySelector('input[name="transcribeLang"]:checked')?.value || 'auto';
}

function renderEvidence(data) {
  const items = data.evidence_trail || data.sources || data.hits || [];
  if (!items.length) {
    return '<p>No evidence trail was available for this request.</p>';
  }
  return `<div class="source-list">${items.map(renderEvidenceItem).join('')}</div>`;
}

function renderEvidenceItem(item) {
  const title = item.title || item.citation || 'Source';
  const body = item.excerpt || item.why_it_matters || item.citation || '';
  const chunkText = item.chunk_text || '';
  const meta = [
    item.package_or_corpus,
    item.section,
    item.score !== undefined && item.score !== null ? `score ${item.score}` : '',
  ].filter(Boolean).join(' · ');

  const chunkToggle = (chunkText && chunkText !== body) ? `
    <details class="chunk-details">
      <summary class="chunk-toggle">View chunk</summary>
      <pre class="chunk-text">${escapeHtml(chunkText)}</pre>
    </details>
  ` : '';

  return `
    <article class="source-card">
      <h4>${escapeHtml(title)}</h4>
      ${meta ? `<p class="source-meta">${escapeHtml(meta)}</p>` : ''}
      <p>${escapeHtml(body)}</p>
      ${chunkToggle}
    </article>
  `;
}

function renderTimeline(events) {
  if (!events.length) {
    return '<p>No events were identified.</p>';
  }
  return `<ol class="timeline-list">${events.map((ev) => `
    <li>
      <strong>${escapeHtml(ev.date || 'unknown')}</strong>
      ${ev.date_type ? `<span class="date-type-badge">${escapeHtml(ev.date_type)}</span>` : ''}
      <span>${escapeHtml(ev.actor || 'unknown actor')}</span>
      <p>${escapeHtml(ev.event || '')}</p>
      ${ev.source_excerpt ? `<small>${escapeHtml(ev.source_excerpt)}</small>` : ''}
    </li>
  `).join('')}</ol>`;
}

function exportTimelineCSV(events) {
  const header = ['Date', 'Date Type', 'Actor', 'Event', 'Source Excerpt', 'Confidence'];
  const rows = events.map((ev) => [
    ev.date || '', ev.date_type || '', ev.actor || '',
    ev.event || '', ev.source_excerpt || '', ev.confidence || '',
  ]);
  const csv = [header, ...rows]
    .map((row) => row.map((cell) => `"${String(cell).replace(/"/g, '""')}"`).join(','))
    .join('\n');
  const blob = new Blob([csv], { type: 'text/csv' });
  const url = URL.createObjectURL(blob);
  const a = Object.assign(document.createElement('a'), { href: url, download: 'timeline.csv' });
  a.click();
  URL.revokeObjectURL(url);
}

function currentTranscribeEngine() {
  const el = document.querySelector('input[name="engine"]:checked');
  return el ? el.value : 'gpu';
}
function currentTranscribeModel() {
  const el = document.querySelector('input[name="model"]:checked');
  return el ? el.value : 'small';
}
function currentBeamSize() {
  const el = document.querySelector('input[name="beam_size"]:checked');
  return el ? el.value : '5';
}
function currentTask() {
  const el = document.querySelector('input[name="task"]:checked');
  return el ? el.value : 'transcribe';
}

async function runTranscribe() {
  if (!lastAudioFile) {
    els.status.textContent = 'Choose an audio file before transcribing.';
    return;
  }

  const engine = currentTranscribeEngine();

  // BYOK key validation before starting the upload
  if (engine === 'openai') {
    const key = document.getElementById('openaiKeyInput')?.value?.trim();
    if (!key || !key.startsWith('sk-')) {
      els.status.textContent = 'Enter a valid OpenAI API key (sk-…) before running.';
      return;
    }
    if (lastAudioFile.size > 25 * 1024 * 1024) {
      els.status.textContent = 'OpenAI Whisper has a 25 MB file limit. Switch to GPU engine for this file.';
      return;
    }
  }
  if (engine === 'azure') {
    const key = document.getElementById('azureKeyInput')?.value?.trim();
    if (!key) {
      els.status.textContent = 'Enter an Azure Speech API key before running.';
      return;
    }
  }

  setBusy(true);

  const startTime = Date.now();
  let elapsed = 0;
  updateTranscribeTrace(0, engine);
  els.status.textContent = 'Transcribing…';

  const timer = setInterval(() => {
    elapsed = Math.floor((Date.now() - startTime) / 1000);
    const m = Math.floor(elapsed / 60);
    const s = elapsed % 60;
    els.status.textContent = m > 0 ? `Transcribing… ${m}:${pad2(s)}` : `Transcribing… ${s}s`;
    updateTranscribeTrace(elapsed, engine);
  }, 1000);

  try {
    const formData = new FormData();
    formData.append('audio', lastAudioFile);
    formData.append('engine', engine);
    formData.append('language', currentTranscribeLang());
    formData.append('model', currentTranscribeModel());
    formData.append('beam_size', currentBeamSize());
    formData.append('task', currentTask());

    const vadCheck = document.getElementById('vadFilterCheck');
    if (vadCheck?.checked) formData.append('vad_filter', '1');

    const initPrompt = document.getElementById('initPromptInput')?.value?.trim();
    if (initPrompt) formData.append('initial_prompt', initPrompt);

    if (els.diarizeCheck?.checked) {
      formData.append('diarize', '1');
      const n = parseInt(els.numSpeakersInput?.value || '', 10);
      if (n >= 2) formData.append('num_speakers', String(n));
    }

    if (engine === 'openai') {
      formData.append('openai_key', document.getElementById('openaiKeyInput')?.value?.trim());
    }
    if (engine === 'azure') {
      formData.append('azure_key', document.getElementById('azureKeyInput')?.value?.trim());
      formData.append('azure_region', document.getElementById('azureRegionInput')?.value?.trim() || 'norwayeast');
    }

    const resp = await fetch('api/transcribe.php', {
      method: 'POST',
      credentials: 'same-origin',
      body: formData,
    });
    const data = await resp.json().catch(() => ({}));
    if (!resp.ok || !data.ok) {
      throw new Error(data.error?.message || `Transcription failed (HTTP ${resp.status}).`);
    }

    lastTranscriptData = data;
    renderTranscriptResults(data);

    const dur  = data.duration_sec     ? ` · Audio: ${Math.round(data.duration_sec)}s`      : '';
    const proc = data.processing_sec   ? ` · GPU: ${data.processing_sec.toFixed(1)}s`        : '';
    const rtf  = (data.duration_sec && data.processing_sec)
      ? ` · RTF: ${(data.processing_sec / data.duration_sec).toFixed(2)}` : '';
    els.status.textContent = `Done in ${data.latency_ms || 0} ms${dur}${proc}${rtf}.`;
  } catch (error) {
    els.status.textContent = error.message;
    renderTrace([{ label: 'Transcription error', detail: error.message, status: 'warning' }]);
  } finally {
    clearInterval(timer);
    setBusy(false);
  }
}

function updateTranscribeTrace(elapsed, engine) {
  const engineLabel = engine === 'openai' ? 'OpenAI API' : engine === 'azure' ? 'Azure Speech' : 'Whisper GPU';
  let label, detail;
  if (elapsed < 10) {
    label  = `Uploading to ${engineLabel}`;
    detail = engine === 'gpu'
      ? 'Sending audio to cuttlefish GPU…'
      : `Sending audio to ${engineLabel}…`;
  } else if (elapsed < 60) {
    label  = `Processing — ${engineLabel}`;
    detail = engine === 'gpu'
      ? 'Whisper is transcribing. Large files take 1–3 minutes.'
      : `${engineLabel} is processing the audio.`;
  } else if (elapsed < 120) {
    label  = 'Still processing…';
    detail = `${Math.floor(elapsed / 60)} min elapsed — ${engineLabel} is working through the audio.`;
  } else {
    label  = 'Still processing…';
    detail = `${Math.floor(elapsed / 60)} min ${pad2(elapsed % 60)}s — long recordings can take several minutes.`;
  }
  renderTrace([{ label, detail, status: 'running' }]);
}

function renderTranscriptResults(data) {
  const speakerRoles = data.speaker_roles || {};
  const segments = data.segments || [];
  const hasSpeakers = segments.some((s) => s.speaker);

  const speakerOrder = [...new Set(segments.filter((s) => s.speaker).map((s) => s.speaker))];

  const rolesHtml = speakerOrder.length
    ? `<p class="transcript-roles">${speakerOrder.map((id, i) => {
        const role = speakerRoles[id] || id;
        return `<span class="speaker-tag speaker-tag--${i % 6}">${escapeHtml(role)}<small>${escapeHtml(id)}</small></span>`;
      }).join('')}</p>`
    : '';

  const segmentsHtml = hasSpeakers
    ? `<details class="segment-details"><summary class="segment-summary">Segments (${segments.length})</summary>
        <div class="segment-list">${segments.map((seg) => {
          const idx = speakerOrder.indexOf(seg.speaker);
          const roleLabel = seg.speaker && speakerRoles[seg.speaker]
            ? `${speakerRoles[seg.speaker]} (${seg.speaker})`
            : (seg.speaker || '');
          return `<div class="segment-row">
            <span class="segment-time">${fmtTime(seg.start)}–${fmtTime(seg.end)}</span>
            ${seg.speaker ? `<span class="speaker-tag speaker-tag--${idx >= 0 ? idx % 6 : 0}">${escapeHtml(roleLabel)}</span>` : ''}
            <span class="segment-text">${escapeHtml(seg.text)}</span>
          </div>`;
        }).join('')}</div></details>`
    : '';

  const dlSrtVtt = segments.length
    ? `<button type="button" class="export-csv-btn" id="dlSrt">Download SRT</button>
       <button type="button" class="export-csv-btn" id="dlVtt">Download VTT</button>`
    : '';

  els.results.innerHTML = `
    <section class="result-section">
      <h3>Transcript</h3>
      ${rolesHtml}
      <div class="transcript-box"><pre class="transcript-text">${escapeHtml(data.transcript)}</pre></div>
      ${segmentsHtml}
      <div class="transcript-downloads">
        <button type="button" class="export-csv-btn" id="dlTxt">Download TXT</button>
        ${dlSrtVtt}
      </div>
    </section>`;

  const traceMeta = [];
  if (data.duration_sec) traceMeta.push({ label: `Duration: ${Math.round(data.duration_sec)}s`, detail: '', status: 'complete' });
  if (data.language) traceMeta.push({ label: `Language: ${data.language}`, detail: '', status: 'complete' });
  if (data.num_speakers > 1) traceMeta.push({ label: `Speakers detected: ${data.num_speakers}`, detail: Object.entries(speakerRoles).map(([id, r]) => `${id}: ${r}`).join(', ') || '', status: 'complete' });
  if (data.model) traceMeta.push({ label: `Model: ${data.model}`, detail: '', status: 'complete' });
  renderTrace(traceMeta.length ? traceMeta : [{ label: 'Transcribed', detail: '', status: 'complete' }]);
}

function fmtTime(secs) {
  const h = Math.floor(secs / 3600);
  const m = Math.floor((secs % 3600) / 60);
  const s = Math.floor(secs % 60);
  const parts = h > 0 ? [pad2(h), pad2(m), pad2(s)] : [pad2(m), pad2(s)];
  return parts.join(':');
}

function pad2(n) { return String(n).padStart(2, '0'); }

function toSrtTime(secs) {
  const h = Math.floor(secs / 3600);
  const m = Math.floor((secs % 3600) / 60);
  const s = Math.floor(secs % 60);
  const ms = Math.round((secs % 1) * 1000);
  return `${pad2(h)}:${pad2(m)}:${pad2(s)},${String(ms).padStart(3, '0')}`;
}

function toVttTime(secs) {
  return toSrtTime(secs).replace(',', '.');
}

function downloadBlob(blob, filename) {
  const url = URL.createObjectURL(blob);
  const a = Object.assign(document.createElement('a'), { href: url, download: filename });
  a.click();
  URL.revokeObjectURL(url);
}

function downloadTranscriptTxt() {
  if (!lastTranscriptData) return;
  downloadBlob(new Blob([lastTranscriptData.transcript], { type: 'text/plain' }), 'transcript.txt');
}

function downloadTranscriptSrt() {
  if (!lastTranscriptData?.segments?.length) return;
  const { segments, speaker_roles: roles = {} } = lastTranscriptData;
  const lines = segments.map((seg, i) => {
    const spk = seg.speaker ? `[${roles[seg.speaker] || seg.speaker}] ` : '';
    return `${i + 1}\n${toSrtTime(seg.start)} --> ${toSrtTime(seg.end)}\n${spk}${seg.text}\n`;
  });
  downloadBlob(new Blob([lines.join('\n')], { type: 'text/srt' }), 'transcript.srt');
}

function downloadTranscriptVtt() {
  if (!lastTranscriptData?.segments?.length) return;
  const { segments, speaker_roles: roles = {} } = lastTranscriptData;
  const lines = ['WEBVTT\n'];
  segments.forEach((seg) => {
    const spk = seg.speaker ? `<v ${roles[seg.speaker] || seg.speaker}>` : '';
    lines.push(`${toVttTime(seg.start)} --> ${toVttTime(seg.end)}\n${spk}${seg.text}\n`);
  });
  downloadBlob(new Blob([lines.join('\n')], { type: 'text/vtt' }), 'transcript.vtt');
}

function resetAudio() {
  lastAudioFile = null;
  if (!els.audioInput) return;
  els.audioInput.value = '';
  if (els.audioPrompt) els.audioPrompt.classList.remove('is-hidden');
  if (els.audioFileInfo) els.audioFileInfo.classList.add('is-hidden');
  if (els.audioFileName) els.audioFileName.textContent = '';
  if (els.audioFileSize) els.audioFileSize.textContent = '';
}

function setupAudio() {
  if (!els.audioZone) return;

  els.audioZone.addEventListener('dragover', (e) => {
    e.preventDefault();
    els.audioZone.classList.add('is-drag-over');
  });

  els.audioZone.addEventListener('dragleave', (e) => {
    if (!els.audioZone.contains(e.relatedTarget)) {
      els.audioZone.classList.remove('is-drag-over');
    }
  });

  els.audioZone.addEventListener('drop', (e) => {
    e.preventDefault();
    els.audioZone.classList.remove('is-drag-over');
    const f = e.dataTransfer?.files?.[0];
    if (f) handleAudio(f);
  });

  els.audioZone.addEventListener('click', (e) => {
    if (e.target === els.audioClear || els.audioClear?.contains(e.target)) return;
    if (e.target === els.audioInput) return;
    if (e.target.tagName === 'LABEL') return;
    els.audioInput.click();
  });

  els.audioInput.addEventListener('change', () => {
    const f = els.audioInput.files?.[0];
    if (f) handleAudio(f);
  });

  els.audioClear.addEventListener('click', () => {
    resetAudio();
    els.status.textContent = '';
  });
}

function setupTranscribeControls() {
  document.querySelectorAll('input[name="engine"]').forEach((radio) => {
    radio.addEventListener('change', () => {
      const engine = currentTranscribeEngine();
      document.getElementById('openaiKeyControl')?.classList.toggle('is-hidden', engine !== 'openai');
      document.getElementById('azureKeyControl')?.classList.toggle('is-hidden', engine !== 'azure');
      document.getElementById('modelControl')?.classList.toggle('is-hidden', engine === 'openai' || engine === 'azure');
    });
  });
}

function handleAudio(file) {
  const allowedExts = ['mp3', 'wav', 'ogg', 'oga', 'm4a', 'mp4', 'flac', 'webm', 'aac'];
  const ext = file.name.split('.').pop().toLowerCase();
  if (!allowedExts.includes(ext)) {
    els.status.textContent = `Unsupported format: .${ext}. Use MP3, WAV, OGG, M4A, FLAC, or WebM.`;
    return;
  }
  const sizeMB = file.size / 1024 / 1024;
  if (sizeMB > 200) {
    els.status.textContent = `File too large (${sizeMB.toFixed(1)} MB). Maximum 200 MB.`;
    return;
  }
  lastAudioFile = file;
  if (els.audioFileName) els.audioFileName.textContent = file.name;
  if (els.audioFileSize) els.audioFileSize.textContent = `${sizeMB.toFixed(1)} MB`;
  if (els.audioPrompt) els.audioPrompt.classList.add('is-hidden');
  if (els.audioFileInfo) els.audioFileInfo.classList.remove('is-hidden');
  els.status.textContent = `Ready: ${file.name} (${sizeMB.toFixed(1)} MB)`;
}

function renderEntityCounts(counts = {}) {
  const entries = Object.entries(counts).filter(([, count]) => Number(count) > 0);
  if (!entries.length) {
    return '<p class="muted">No deterministic sensitive categories detected.</p>';
  }
  return `<ul class="pill-list">${entries.map(([name, count]) => `<li>${escapeHtml(name)} <strong>${Number(count)}</strong></li>`).join('')}</ul>`;
}

function detailList(title, values = []) {
  if (!Array.isArray(values) || !values.length) {
    return '';
  }
  return `<div class="detail-block"><h4>${escapeHtml(title)}</h4><ul>${values.map((item) => `<li>${escapeHtml(String(item))}</li>`).join('')}</ul></div>`;
}

function renderListish(value) {
  if (Array.isArray(value)) {
    if (!value.length) {
      return '<p>No uncertainty listed.</p>';
    }
    return `<ul>${value.map((item) => `<li>${escapeHtml(String(item))}</li>`).join('')}</ul>`;
  }
  return `<p>${escapeHtml(value || 'No uncertainty listed.')}</p>`;
}

function sectionHtml(title, content) {
  return `<section class="result-section"><h3>${escapeHtml(title)}</h3>${content}</section>`;
}

function renderTrace(trace) {
  if (!trace.length) {
    els.traceList.innerHTML = `
      <li>
        <span class="trace-status waiting"></span>
        <div><strong>Waiting</strong><p>Run a tool to see interpretation, retrieval, confidence, uncertainty, and next step.</p></div>
      </li>
    `;
    return;
  }

  els.traceList.innerHTML = trace.map((item) => `
    <li>
      <span class="trace-status ${escapeHtml(item.status || 'complete')}"></span>
      <div>
        <strong>${escapeHtml(item.label || 'Step')}</strong>
        <p>${escapeHtml(item.detail || '')}</p>
      </div>
    </li>
  `).join('');
}

function renderHealth(data) {
  const checks = Object.entries(data.checks || {}).map(([name, check]) => ({
    label: name.replaceAll('_', ' '),
    detail: check.detail || '',
    status: check.ok ? 'complete' : 'warning',
  }));
  renderTrace(checks);
}

function escapeHtml(value) {
  return String(value ?? '')
    .replaceAll('&', '&amp;')
    .replaceAll('<', '&lt;')
    .replaceAll('>', '&gt;')
    .replaceAll('"', '&quot;')
    .replaceAll("'", '&#039;');
}