// ── GRID ──────────────────────────────────────────────────────────────────────
function renderGrid() {
  renderChannels(); renderRuler(); renderPrograms(); positionNowLine();
}

function makePlaceholder(name) {
  const el = document.createElement('div');
  el.className = 'channel-logo-placeholder';
  el.textContent = name.substring(0,2).toUpperCase();
  return el;
}

function makeChannelCell(ch) {
  const cell = document.createElement('div');
  cell.className = 'channel-cell';
  if (ch.icon) {
    const img = document.createElement('img');
    img.className = 'channel-logo'; img.src = ch.icon;
    img.onerror = () => img.replaceWith(makePlaceholder(ch.name));
    cell.appendChild(img);
  } else { cell.appendChild(makePlaceholder(ch.name)); }
  const name = document.createElement('div');
  name.className = 'channel-name'; name.textContent = ch.name; name.title = ch.name;
  cell.appendChild(name);
  cell.appendChild(makeFavBtn(ch.id));
  cell.addEventListener('click', () => openPip(ch.name, getNowPlaying(ch.id)));
  return cell;
}

function renderChannels() {
  const list = document.getElementById('channelsList');
  list.innerHTML = '';
  const { favs, rest } = sortedChannels(channels);

  if (favs.length) {
    favs.forEach(ch => list.appendChild(makeChannelCell(ch)));
    const sep = document.createElement('div');
    sep.className = 'fav-separator';
    list.appendChild(sep);
  }
  rest.forEach(ch => list.appendChild(makeChannelCell(ch)));
}

function renderRuler() {
  const ruler = document.getElementById('timeRulerInner');
  ruler.innerHTML = ''; ruler.style.width = TOTAL_WIDTH_PX + 'px';
  document.getElementById('timeRuler').style.width = TOTAL_WIDTH_PX + 'px';
  let t = new Date(GRID_START); t.setSeconds(0,0);
  const rem = t.getMinutes()%15; if (rem) t.setMinutes(t.getMinutes()+(15-rem));
  while (t <= GRID_END) {
    const x = msToX(t.getTime());
    const isHour = t.getMinutes() === 0;
    const isMidnight = isHour && t.getHours() === 0;
    const tick = document.createElement('div'); tick.className='time-tick'; tick.style.left=x+'px';
    const lbl = document.createElement('div');
    lbl.className = 'time-tick-label' + (isHour ? ' hour' : '') + (isMidnight ? ' midnight' : '');
    if (isMidnight) {
      lbl.textContent = `${L.days[t.getDay()]} ${t.getDate()} ${L.months[t.getMonth()]}`;
    } else {
      lbl.textContent = fmtTime(t);
    }
    const line = document.createElement('div'); line.className='time-tick-line'+(isHour?' hour':'')+(isMidnight?' midnight':'');
    tick.appendChild(lbl); tick.appendChild(line); ruler.appendChild(tick);
    t = new Date(t.getTime()+15*60000);
  }
}

function renderPrograms() {
  const ROW_H = 80;
  const inner = document.getElementById('programsInner');
  const totalH = channels.length * ROW_H;
  inner.innerHTML = '';
  inner.style.width = TOTAL_WIDTH_PX+'px';
  inner.style.height = totalH+'px';

  // Recreate the now-line because it was removed by innerHTML = ''.
  const nowLine = document.createElement('div');
  nowLine.className = 'now-line'; nowLine.id = 'nowLine';
  nowLine.style.height = totalH + 'px';
  inner.appendChild(nowLine);

  const now = new Date();

  const { favs: _f, rest: _r } = sortedChannels(channels);
  const orderedChannels = [..._f, ..._r];
  orderedChannels.forEach((ch, i) => {
    const row = document.createElement('div');
    row.className = 'program-row';
    row.style.cssText = `top:${i*ROW_H}px;position:absolute;left:0;right:0;`;

    (programs[ch.id]||[]).filter(p => p.stop>GRID_START && p.start<GRID_END).forEach(p => {
      const x = Math.max(0, msToX(p.start.getTime()));
      const w = Math.min(TOTAL_WIDTH_PX, msToX(p.stop.getTime())) - x;
      if (w < 2) return;
      const block = document.createElement('div'); block.className='program-block';
      if (p.stop < now) block.classList.add('is-past');
      if (p.start <= now && p.stop > now) {
        block.classList.add('is-live');
        block.style.setProperty('--progress',(((now-p.start)/(p.stop-p.start))*100).toFixed(1)+'%');
      }
      block.style.left=x+'px'; block.style.width=w+'px';
      if (w>40) { const t=document.createElement('div'); t.className='program-title'; t.textContent=p.title; block.appendChild(t); }
      if (w>80) {
        const ep = fmtEpisode(p.season, p.episode);
        const t=document.createElement('div'); t.className='program-time';
        t.textContent = (ep ? ep + '  ' : '') + `${fmtTime(p.start)} — ${fmtTime(p.stop)}`;
        block.appendChild(t);
      }
      block.addEventListener('mouseenter', e=>showTooltip(e,p));
      block.addEventListener('mousemove',  e=>moveTooltip(e));
      block.addEventListener('mouseleave', hideTooltip);
      block.addEventListener('click', (e) => { hideTooltip(); openProgramModal(ch, p); });
      row.appendChild(block);
    });
    inner.appendChild(row);
  });

  positionNowLine();
  if (!scrollListenerAdded) {
    scrollListenerAdded = true;
    document.getElementById('timelineArea').addEventListener('scroll', function() {
      document.getElementById('channelsList').scrollTop = this.scrollTop;
    });
  }
}

function positionNowLine() {
  const x = msToX(Date.now());
  const line = document.getElementById('nowLine');
  if (line) line.style.left = x + 'px';
}

function centerNow() {
  const area = document.getElementById('timelineArea');
  area.scrollLeft = Math.max(0, msToX(Date.now()) - area.offsetWidth * 0.3);
  document.querySelectorAll('.nav-btn').forEach((b,i) => b.classList.toggle('active', i===1));
}

function shiftView(mins) {
  const area = document.getElementById('timelineArea');
  area.scrollLeft = Math.max(0, area.scrollLeft + mins * PX_PER_MIN);
  document.querySelectorAll('.nav-btn').forEach(b => b.classList.remove('active'));
}