// The per-row full-file player and its cut fields. Section review normally
// goes through clips.js; this is for listening around a section ("Open in
// file") or to a whole recording.

import {$, fmtDur} from './util.js';
import {fileByIdx, fileSpan} from './store.js';
import {streamUrl} from './api.js';
import {getPreroll} from './settings.js';

// Row of the full-file player opened last. The J/K/U/I fallback steps through
// its sections when no clip queue is armed. Live binding — read, don't assign.
export let activePlayerIdx = null;

export function forgetPlayer(idx) {
  if (activePlayerIdx === idx) activePlayerIdx = null;
}

export function setCutFields(idx, startSec, endSec) {
  const startEl = $('cut-start-' + idx);
  const endEl   = $('cut-end-' + idx);
  if (startEl) startEl.value = fmtDur(startSec);
  if (endEl && endSec != null) endEl.value = fmtDur(endSec);
}

const isOpen = idx => $('pbtn-' + idx)?.getAttribute('aria-expanded') === 'true';

function setPlayButton(idx, open) {
  const btn = $('pbtn-' + idx);
  const f   = fileByIdx(idx);
  if (!btn || !f) return;
  btn.setAttribute('aria-expanded', open);
  btn.textContent = open ? 'Hide' : 'Play';
  btn.setAttribute('aria-label', (open ? 'Hide player for ' : 'Play ') + fileSpan(f));
}

// The player lives in its own table cell: the Play button stays, and the
// audio element appears right after it
export function closePlayer(idx) {
  const audio = $('aud-' + idx);
  if (!audio || audio.hidden) return;
  audio.pause();
  audio.hidden = true;
  setPlayButton(idx, false);
}

export function togglePlayer(idx) {
  if (isOpen(idx)) { closePlayer(idx); return; }
  const f     = fileByIdx(idx);
  const audio = $('aud-' + idx);
  if (!f || !audio) return;
  if (!audio.dataset.srcSet) {
    audio.preload = 'auto';
    audio.src = streamUrl(f.name);
    audio.load();
    audio.dataset.srcSet = '1';
  } else if (!$('rec-' + idx)?.hidden) {
    // Still recording: re-fetch so duration and seek range cover the audio
    // captured since the source was last loaded
    audio.load();
  }
  activePlayerIdx = idx;
  audio.hidden = false;
  setPlayButton(idx, true);
  audio.focus();
}

export function seekToSection(idx, startSec, endSec) {
  if (!isOpen(idx)) togglePlayer(idx);
  activePlayerIdx = idx;
  const audio = $('aud-' + idx);
  if (!audio) return;
  audio.preload = 'auto';
  const seekTo = Math.max(0, startSec - getPreroll());
  const doSeek = () => { audio.currentTime = seekTo; audio.play().catch(() => {}); };
  if (audio.readyState >= 1) doSeek();
  else audio.addEventListener('loadedmetadata', doSeek, {once: true});
  setCutFields(idx, startSec, endSec);
}

// Cut button: show/hide the start/end fields inside the options cell. Opening
// puts focus in Start. Clip playback pre-fills the fields either way.
export function toggleCut(idx) {
  const btn   = $('cutbtn-' + idx);
  const panel = $('cut-' + idx);
  if (!btn || !panel) return;
  const open = panel.hidden;
  panel.hidden = !open;
  btn.setAttribute('aria-expanded', open);
  btn.querySelector('.day-arrow').textContent = open ? '▾ ' : '▸ ';
  if (open) $('cut-start-' + idx)?.focus();
}