{{define "content"}}

<section class="panel">
  <h2>Накопитель</h2>
  <table class="kv-table">
    <tbody>
      <tr>
        <th>Статус</th>
        <td id="diskState"><span class="badge badge-unknown">Не подключён</span></td>
      </tr>
      <tr id="rowDiskID" class="hidden">
        <th>ID диска</th>
        <td><span class="mono" id="valDiskID"></span></td>
      </tr>
      <tr id="rowTotal" class="hidden">
        <th>Всего на диске</th>
        <td id="valTotal"></td>
      </tr>
      <tr id="rowFree" class="hidden">
        <th>Свободно</th>
        <td id="valFree"></td>
      </tr>
    </tbody>
  </table>
</section>

<section class="panel hidden" id="progressPanel">
  <h2>Копирование</h2>
  <div style="padding:14px 16px">
    <div class="progress-bar-bg">
      <div class="progress-bar-fill" id="progressFill" style="width:0%"></div>
    </div>
    <div style="display:flex;justify-content:space-between;align-items:baseline;margin-top:6px">
      <div class="progress-label" id="progressMsg">Подготовка…</div>
      <div class="progress-label" id="progressMeta" style="text-align:right"></div>
    </div>
  </div>
</section>

<div class="btn-row" style="background:transparent;border:none;padding:0;margin-bottom:24px">
  <button class="button-primary" id="btnStart" onclick="startCopy()" disabled>▶ Запустить копирование</button>
  <button class="button-danger hidden" id="btnCancel" onclick="cancelCopy()">✕ Отменить</button>
</div>

<script>
let pollInterval = null;
let activeTaskId = null;

async function refreshDisk() {
  try {
    const r = await fetch('/api/disk');
    if (!r.ok) return;
    const d = await r.json();

    const labels = { absent: 'Не подключён', foreign: 'Незнакомый диск', known: 'Диск подключён' };
    const cls    = { absent: 'badge-unknown', foreign: 'badge-warn', known: 'badge-ok' };
    document.getElementById('diskState').innerHTML =
      `<span class="badge ${cls[d.state]||'badge-unknown'}">${labels[d.state]||'—'}</span>`;

    const known = d.state === 'known';
    ['rowDiskID','rowTotal','rowFree'].forEach(id =>
      document.getElementById(id).classList.toggle('hidden', !known));
    if (known) {
      document.getElementById('valDiskID').textContent = d.disk_id;
      document.getElementById('valTotal').textContent  = fmtBytes(d.total_bytes);
      document.getElementById('valFree').textContent   = fmtBytes(d.free_bytes);
    }

    const hasTask = !!d.active_task_id;
    document.getElementById('btnStart').disabled = !known || hasTask;
    document.getElementById('btnStart').classList.toggle('hidden', hasTask);
    document.getElementById('btnCancel').classList.toggle('hidden', !hasTask);
    document.getElementById('progressPanel').classList.toggle('hidden', !hasTask);

    if (d.active_task_id && d.active_task_id !== activeTaskId) {
      activeTaskId = d.active_task_id;
      startTaskPoll(activeTaskId);
    }
    if (!d.active_task_id && activeTaskId) {
      activeTaskId = null; stopTaskPoll();
      document.getElementById('progressPanel').classList.add('hidden');
    }
  } catch(e) {}
}

function startTaskPoll(id) { stopTaskPoll(); pollInterval = setInterval(() => pollTask(id), 1500); }
function stopTaskPoll()    { if (pollInterval) { clearInterval(pollInterval); pollInterval = null; } }

function fmtSpeed(bps) {
  if (!bps) return '';
  if (bps >= 1e9) return (bps/1e9).toFixed(1) + ' ГБ/с';
  if (bps >= 1e6) return (bps/1e6).toFixed(1) + ' МБ/с';
  if (bps >= 1e3) return (bps/1e3).toFixed(0) + ' КБ/с';
  return bps + ' Б/с';
}

function fmtETA(sec) {
  if (!sec || sec <= 0) return '';
  if (sec >= 3600) return Math.floor(sec/3600) + ' ч ' + Math.floor((sec%3600)/60) + ' мин';
  if (sec >= 60)   return Math.floor(sec/60) + ' мин';
  return sec + ' с';
}

async function pollTask(id) {
  try {
    const r = await fetch('/api/tasks/' + id);
    if (!r.ok) return;
    const t = await r.json();
    document.getElementById('progressFill').style.width = t.progress + '%';
    document.getElementById('progressMsg').textContent = t.message || '…';

    const speed = fmtSpeed(t.speed_bps);
    const eta   = fmtETA(t.eta_sec);
    const meta  = [speed, eta ? 'ETA: ' + eta : ''].filter(Boolean).join(' · ');
    document.getElementById('progressMeta').textContent = meta;
    if (['success','failed','canceled'].includes(t.status)) {
      stopTaskPoll(); activeTaskId = null;
      document.getElementById('btnStart').disabled = false;
      document.getElementById('btnStart').classList.remove('hidden');
      document.getElementById('btnCancel').classList.add('hidden');
      document.getElementById('progressPanel').classList.add('hidden');
      document.getElementById('progressMeta').textContent = '';
      if (t.status === 'success') toast(t.message || 'Готово', 'ok');
      if (t.status === 'failed')   toast('Ошибка: ' + t.error, 'error');
      if (t.status === 'canceled') toast('Копирование отменено', 'error');
      refreshDisk();
    }
  } catch(e) {}
}

async function startCopy() {
  document.getElementById('btnStart').disabled = true;
  try {
    const r = await fetch('/api/copy/start', { method: 'POST' });
    const d = await r.json();
    if (!r.ok) {
      toast(d.error || 'Ошибка запуска', 'error');
      document.getElementById('btnStart').disabled = false;
      return;
    }
    activeTaskId = d.task_id;
    document.getElementById('btnStart').classList.add('hidden');
    document.getElementById('btnCancel').classList.remove('hidden');
    document.getElementById('progressPanel').classList.remove('hidden');
    document.getElementById('progressFill').style.width = '0%';
    document.getElementById('progressMsg').textContent = 'Подготовка…';
    startTaskPoll(activeTaskId);
  } catch(e) {
    toast('Ошибка связи', 'error');
    document.getElementById('btnStart').disabled = false;
  }
}

async function cancelCopy() {
  try { await fetch('/api/copy/cancel', { method: 'POST' }); toast('Отмена…', 'ok'); } catch(e) {}
}

refreshDisk();
setInterval(refreshDisk, 5000);
</script>
{{end}}