'use strict';
// ---- Audiobooks: your library from the audiobook player, through the hub (the hub signs in for you). Books play in the same player as Music,
// and where you got to is kept by the audiobook player, so it follows you between this app, the player's own page and your other devices.
const abApi = (p, opts) => jfetch('/api/ab' + p, opts);
const abPick = (o, ...ks) => { for (const k of ks) if (o && o[k] != null && o[k] !== '') return o[k]; };
const abId = b => String(abPick(b, 'id', 'asin', 'ASIN', 'book_id'));
const abTitle = b => abPick(b, 'title', 'title_short', 'name') || '(untitled)';
const abAuthor = b => { const a = abPick(b, 'author', 'author_name', 'authors', 'author_display') || ''; return Array.isArray(a) ? a.join(', ') : a; };
const abSeries = b => abPick(b, 'series_name', 'series') || '';
const abCover = b => `/api/ab/books/${encodeURIComponent(abId(b))}/cover`;
const abFmt = s => { s = Math.max(0, Math.floor(s || 0)); const h = Math.floor(s / 3600), m = Math.floor(s % 3600 / 60), x = s % 60; return (h ? h + ':' + String(m).padStart(2, '0') : m) + ':' + String(x).padStart(2, '0'); };
const abHue = t => { let h = 0; for (const c of t) h = (h * 31 + c.charCodeAt(0)) % 360; return h; };
let abBooks = null, abProg = {};
const abIsPlaying = () => { const t = cur(); return t && String(t.key).startsWith('ab:') ? t.key.slice(3) : ''; };

async function abFile(id) {
  const data = await abApi(`/books/${encodeURIComponent(id)}/filelist`);
  const arr = Array.isArray(data) ? data : (data.files || Object.values(data));
  const names = arr.map(f => typeof f === 'string' ? f : abPick(f, 'name', 'filename', 'file', 'path')).filter(Boolean).map(n => n.split('/').pop());
  return names.find(n => /\.mp3$/i.test(n)) || names.find(n => /\.(mp3|m4b|m4a|aac|ogg|opus|flac|wav)$/i.test(n));
}
async function abChapters(id) {
  try {
    const data = await abApi(`/books/${encodeURIComponent(id)}/chapters/flat`), arr = Array.isArray(data) ? data : (data.chapters || []);
    return arr.map(c => { let s = abPick(c, 'start', 'start_sec', 'start_seconds', 'startOffsetSec', 'start_offset_sec');
      if (s == null) { const ms = abPick(c, 'start_ms', 'start_offset_ms', 'startOffsetMs', 'offset_ms'); if (ms != null) s = ms / 1000; }
      return { title: abPick(c, 'title', 'name') || 'Chapter', start: Number(s) }; }).filter(c => !isNaN(c.start));
  } catch { return []; }
}

/** Start (or carry on with) a book: from where you got to, unless that was the very end. */
async function abPlay(b, at) {
  const id = abId(b);
  if (abIsPlaying() === id) { if (at != null) pl.a.currentTime = at; else if (pl.a.paused) pl.a.play().catch(() => {}); return; }
  const file = await abFile(id);
  if (!file) throw new Error('No playable MP3 or M4B for this book. Convert it in OpenAudible first.');
  const pr = abProg[id], start = at != null ? at : pr && pr.pos > 10 && (!pr.dur || pr.pos < pr.dur - 30) ? pr.pos : 0;
  playQueue([{ key: 'ab:' + id, title: abTitle(b), artist: abAuthor(b), album: abSeries(b), thumb: abCover(b), src: `/api/ab/books/${encodeURIComponent(id)}/files/${encodeURIComponent(file)}`, dur: 0, nocache: true }], 0);
  if (start) pl.a.addEventListener('loadedmetadata', () => { if (abIsPlaying() === id) pl.a.currentTime = start; }, { once: true });
}

// Where you got to goes back to the audiobook player every few seconds while listening, and when you pause or leave.
let abLast = 0, abQueued = {};
const abPush = keepalive => {
  if (!Object.keys(abQueued).length) return;
  const body = JSON.stringify(abQueued); abQueued = {};
  fetch('/api/ab/progress', { method: 'POST', headers: { 'content-type': 'application/json' }, body, keepalive: !!keepalive })
    .then(r => { if (!r.ok) throw 0; }).catch(() => { abQueued = { ...JSON.parse(body), ...abQueued }; });
};
const abSave = keepalive => {
  const id = abIsPlaying(), d = pl.a.duration; if (!id || !isFinite(d) || d <= 0) return;
  abProg[id] = abQueued[id] = { pos: pl.a.currentTime, dur: d, t: Date.now() }; abPush(keepalive);
};
pl.a.addEventListener('timeupdate', () => { if (Date.now() - abLast > 8000) { abLast = Date.now(); abSave(); } });
pl.a.addEventListener('pause', () => abSave());
pl.a.addEventListener('ended', () => abSave());
addEventListener('pagehide', () => abSave(true));

/** Fetch where you got to in each book (from the audiobook player) and fold it into what this page already knows. */
const abLoadProg = async () => { try { for (const [id, p] of Object.entries(await abApi('/progress') || {})) if (!abProg[id] || p.t > abProg[id].t) abProg[id] = p; } catch {} };

async function viewBooks(args = []) {
  const v = $('#view');
  v.innerHTML = '<div class="wrap"><h1>Audiobooks</h1><p class="empty">Loading…</p></div>';
  try {
    const [data] = await Promise.all([abApi('/books'), abLoadProg(), lvPrime()]);
    abBooks = Array.isArray(data) ? data : (data.books || Object.values(data));
  } catch (e) {
    if (!location.hash.startsWith('#/audio')) return;
    await lvPrime(); if (!location.hash.startsWith('#/audio')) return;
    v.innerHTML = `<div class="wrap"><h1>Audiobooks</h1><p class="err">${esc(e.message)}</p><div class="bar"><button class="btn ghost" id="abretry">Try again</button><a class="btn ghost" href="#/audio/free">Free audiobooks</a><a class="btn ghost" href="#/settings">Settings</a><a class="btn ghost" href="#/audio/classic">Open the classic player</a></div>${lvShelf.length ? `<h2>My free audiobooks</h2><div class="vgrid">${lvRecent().map(b => lvCard(b)).join('')}</div>` : ''}</div>`;
    $('#abretry').onclick = () => route(); lvBind(v, () => route()); return;
  }
  if (!location.hash.startsWith('#/audio')) return;
  const pct = b => { const p = abProg[abId(b)]; return p && p.dur ? Math.min(100, p.pos / p.dur * 100) : 0; };
  const card = (b, wide) => `<button class="vcard${wide ? ' wide' : ''}" data-id="${esc(abId(b))}" style="text-align:left;background:none;border:0;padding:0;color:inherit;font:inherit;cursor:pointer;${wide ? 'width:140px;flex:none' : ''}">
    <span class="vimg" style="aspect-ratio:1/1;background:linear-gradient(135deg,hsl(${abHue(abTitle(b))} 55% 40%),hsl(${abHue(abTitle(b)) + 40} 55% 28%))"><img loading="lazy" alt="" src="${abCover(b)}" onerror="this.remove()">${pct(b) > 1 ? `<i class="vprog"><b style="width:${pct(b)}%"></b></i>` : ''}</span>
    <b>${esc(abTitle(b))}</b><small>${esc(abAuthor(b))}</small></button>`;
  const cont = abBooks.filter(b => { const p = abProg[abId(b)]; return p && p.pos > 10 && p.dur && p.pos < p.dur - 30; }).sort((a, b) => abProg[abId(b)].t - abProg[abId(a)].t).slice(0, 10);
  const contFree = lvShelf.filter(b => lvLeft(b.id)).sort((a, b) => lvProg['lv:' + b.id].t - lvProg['lv:' + a.id].t).slice(0, 10);
  v.innerHTML = `<div class="wrap"><div class="ptop"><h1>Audiobooks</h1><span class="pspace grow"></span><a class="btn ghost" href="#/audio/free">Free audiobooks</a><a class="btn ghost" href="#/audio/classic" title="The audiobook player's own page">Classic player</a></div>
    ${cont.length || contFree.length ? `<h2>Continue listening</h2><div class="vrow">${[...cont.map(b => ({ t: abProg[abId(b)].t, h: card(b, true) })), ...contFree.map(b => ({ t: lvProg['lv:' + b.id].t, h: lvCard(b, true) }))].sort((a, b) => b.t - a.t).map(x => x.h).join('')}</div>` : ''}
    ${lvShelf.length ? `<h2>My free audiobooks</h2><div class="vgrid">${lvRecent().map(b => lvCard(b)).join('')}</div>` : ''}
    <input type="search" id="abq" placeholder="Search your books" autocomplete="off" autocapitalize="off" style="margin-top:14px">
    <h2>Library</h2><div class="vgrid" id="abgrid"></div></div>`;
  const draw = () => {
    const q = $('#abq').value.trim().toLowerCase(), list = abBooks.filter(b => !q || (abTitle(b) + ' ' + abAuthor(b) + ' ' + abSeries(b)).toLowerCase().includes(q))
      .sort((a, b) => abTitle(a).localeCompare(abTitle(b)));
    $('#abgrid').innerHTML = list.map(b => card(b)).join('') || `<p class="empty">${abBooks.length ? 'No books match.' : 'No books in the library yet.'}</p>`;
  };
  draw(); $('#abq').oninput = draw;
  const byId = new Map(abBooks.map(b => [abId(b), b]));
  v.onclick = e => { const c = e.target.closest('button[data-id]'); if (c) abSheet(byId.get(c.dataset.id)); };
  lvBind(v, () => route());
}

function abSheet(b) {
  const id = abId(b), p = abProg[id], left = p && p.dur ? p.dur - p.pos : 0, resumable = p && p.pos > 10 && p.dur && p.pos < p.dur - 30;
  const el = openSheet(abTitle(b), [abAuthor(b), abSeries(b)].filter(Boolean).join(' · '), `<div style="display:flex;gap:14px;align-items:flex-start"><span class="vimg" style="width:96px;flex:none;aspect-ratio:1/1"><img alt="" src="${abCover(b)}" onerror="this.remove()"></span>
      <div style="min-width:0"><p class="sub" style="margin:0">${resumable ? esc(abFmt(p.pos) + ' of ' + abFmt(p.dur) + ' · ' + abFmt(left) + ' left') : p && p.dur && p.pos >= p.dur - 30 ? 'Finished' : 'Not started'}</p></div></div>
    <div class="bar"><button class="btn" id="abp">${icon('play')}${resumable ? 'Resume' : 'Play'}</button>${resumable ? '<button class="btn ghost" id="abs">From the start</button>' : ''}<button class="btn ghost" id="abc">Chapters</button></div><div class="err" id="abe"></div><div id="abch" class="list" style="max-height:40vh;overflow:auto"></div>`);
  const go = async at => { try { await abPlay(b, at); closeSheet(); } catch (e) { el.querySelector('#abe').textContent = e.message; } };
  el.querySelector('#abp').onclick = () => go();
  if (el.querySelector('#abs')) el.querySelector('#abs').onclick = () => go(0);
  el.querySelector('#abc').onclick = async () => {
    const box = el.querySelector('#abch'); box.innerHTML = '<p class="empty">Loading…</p>';
    const ch = await abChapters(id);
    box.innerHTML = ch.length ? ch.map((c, i) => `<button class="row" data-i="${i}"><span class="grow"><b>${esc(c.title)}</b><small>${abFmt(c.start)}</small></span></button>`).join('') : '<p class="empty">This book has no chapter list.</p>';
    box.querySelectorAll('button[data-i]').forEach(x => x.onclick = () => go(ch[x.dataset.i].start));
  };
}