// ─── Shared utilities (used by both ASR and TTS tabs) ─────────────────────────

const SPEAKER_COLORS = [
  '#4fa3e0','#e06b4f','#4fe09c','#e0c44f','#a04fe0',
  '#e04fa3','#4fd4e0','#e0a44f','#7fe04f','#9b59b6',
];
const colorMap = {};
let colorIdx = 0;

function speakerColor(speaker) {
  if (!(speaker in colorMap)) {
    colorMap[speaker] = speaker === 'UNKNOWN'
      ? '#7a85a8'
      : SPEAKER_COLORS[colorIdx++ % SPEAKER_COLORS.length];
  }
  return colorMap[speaker];
}

function resetColors() {
  Object.keys(colorMap).forEach(k => delete colorMap[k]);
  colorIdx = 0;
}

function esc(text) {
  const d = document.createElement('div');
  d.appendChild(document.createTextNode(text));
  return d.innerHTML;
}

function fmtTime(s) {
  const m = Math.floor(s / 60);
  const sec = (s % 60).toFixed(1).padStart(4, '0');
  return `${String(m).padStart(2,'0')}:${sec}`;
}

function fmtTimestamp(id) {
  // id: YYYYMMDD_HHMMSS_ffffff
  if (!id || id.length < 15) return id;
  const y = id.slice(0,4), mo = id.slice(4,6), d = id.slice(6,8);
  const h = id.slice(9,11), mi = id.slice(11,13), s = id.slice(13,15);
  return `${y}-${mo}-${d} ${h}:${mi}:${s}`;
}

function renderSpeakerBlocks(segments, container, sectionEl) {
  if (!segments || !segments.length || !segments.some(s => s.speaker)) {
    sectionEl.style.display = 'none';
    return;
  }
  resetColors();
  const groups = [];
  let cur = null;
  for (const seg of segments) {
    const spk = seg.speaker || 'UNKNOWN';
    if (!cur || cur.speaker !== spk) { cur = {speaker: spk, segs: [seg]}; groups.push(cur); }
    else cur.segs.push(seg);
  }
  let html = '';
  for (const g of groups) {
    const c = speakerColor(g.speaker);
    const text = g.segs.map(s => (s.text||'').trim()).join(' ');
    const t0 = g.segs[0].start, t1 = g.segs[g.segs.length-1].end;
    html += `<div class="speaker-block">
      <div class="speaker-badge">
        <span class="speaker-dot" style="background:${c}"></span>
        <span style="color:${c}">${esc(g.speaker)}</span>
        <span class="speaker-time">${fmtTime(t0)} – ${fmtTime(t1)}</span>
      </div>
      <div class="speaker-text">${esc(text)}</div>
    </div>`;
  }
  container.innerHTML = html;
  sectionEl.style.display = '';
}

function downloadBlob(name, text, type) {
  const blob = new Blob([text], {type});
  const url = URL.createObjectURL(blob);
  const a = document.createElement('a');
  a.href = url; a.download = name;
  document.body.appendChild(a); a.click(); a.remove();
  URL.revokeObjectURL(url);
}

// ─── Collapsible toggles ──────────────────────────────────────────────────────

function makeToggle(btnId, panelId, chevronId) {
  const btn = document.getElementById(btnId);
  const panel = document.getElementById(panelId);
  const chevron = document.getElementById(chevronId);
  if (!btn || !panel) return;
  btn.addEventListener('click', () => {
    const open = panel.style.display !== 'none';
    panel.style.display = open ? 'none' : '';
    if (chevron) chevron.style.transform = open ? '' : 'rotate(90deg)';
  });
}

// ─── Nestable tab groups (top-level ASR/TTS switch + each domain's sub-tabs) ───
//
// Each `.tab-group` owns one `.tabs` row of `.tab-btn` and a set of sibling
// `.tab-panel` elements. Scoping with `:scope >` means groups can nest freely
// (e.g. the top ASR/TTS switch contains a `.tab-group` per domain) without
// their click handlers interfering with each other.

function initTabGroups() {
  document.querySelectorAll('.tab-group').forEach(group => {
    const buttons = group.querySelectorAll(':scope > .tabs > .tab-btn');
    const panels = group.querySelectorAll(':scope > .tab-panel');
    buttons.forEach(btn => {
      btn.addEventListener('click', () => {
        buttons.forEach(b => b.classList.remove('active'));
        panels.forEach(p => p.style.display = 'none');
        btn.classList.add('active');
        const target = document.getElementById(btn.dataset.target);
        if (target) target.style.display = '';
      });
    });
  });
}

initTabGroups();