'use strict';
/* Manga overview: complete metadata, volume filters and newest-first chapters. */
(async function () {
  const id = new URLSearchParams(location.search).get('m') || '';
  let me, M;
  try { [me, M] = await Promise.all([api('api/me'), api('api/manga?' + qsa({ m: id }))]); } catch (e) { return showError(e); }
  topNav(me);
  document.title = M.title + ' · MangaCircus';
  const meta = M.meta || {}, main = $('main');
  main.textContent = '';

  const TYPE = { rtl: 'Manga · right to left', ltr: 'Comic · left to right', ttb: 'Webtoon · vertical strip' };
  const arr = x => (Array.isArray(x) ? x : x ? [x] : []);
  const text = value => {
    if (value == null || value === '') return '';
    if (Array.isArray(value)) return value.map(text).filter(Boolean).join(', ');
    if (typeof value === 'object') return JSON.stringify(value);
    return String(value);
  };
  const releaseDate = () => {
    const raw = meta.firstReleaseDate || meta.releaseDate || meta.startDate;
    if (!raw) return text(meta.year);
    if (typeof raw !== 'object') return text(raw);
    return [raw.year, raw.month && String(raw.month).padStart(2, '0'), raw.day && String(raw.day).padStart(2, '0')].filter(Boolean).join('-');
  };
  const follow = h('button', { class: 'btn' }, '');
  const drawFollow = () => { follow.textContent = M.following ? '🔔 Notifying you' : 'Notify me about new chapters'; follow.classList.toggle('on', M.following); };
  follow.onclick = async () => { M.following = (await api('api/follow', { m: M.id, on: !M.following })).following; drawFollow(); };
  drawFollow();

  const sources = arr(meta.sources).filter(source => source && (source.name || source.url));
  const tags = arr(meta.tags).filter(Boolean);
  const numberedChapters = M.chapters.map(chapter => /^Ch\. (\d+(?:\.\d+)?)/.exec(chapter.label || ''))
    .filter(Boolean).map(match => Number(match[1]));
  const firstNumber = numberedChapters.length ? Math.min(...numberedChapters) : null;
  const books = {};
  for (const book of M.books) books[book.key] = book;
  const selectedBooks = new Set();
  main.append(h('section', { class: 'hero' },
    M.cover ? h('img', { src: M.cover, alt: '' }) : null,
    h('div', { class: 'info' },
      h('h1', {}, M.title),
      arr(meta.altTitles).length ? h('div', { class: 'muted' }, arr(meta.altTitles).join(' · ')) : null,
      h('div', { class: 'muted' }, [arr(meta.authors).join(', '), meta.status, releaseDate(), TYPE[M.direction]].filter(Boolean).join(' · ')),
      firstNumber > 1 ? h('div', { class: 'coverage-indicators', role: 'status' },
        h('span', { class: 'coverage-badge coverage-partial' }, 'Series coverage partial'),
        h('span', { class: 'small' }, `This library starts at chapter ${firstNumber}; earlier numbered chapters are absent.`)) : null,
      h('div', { class: 'chips' }, tags.map(tag => h('a', { class: 'chip chip-link', href: libraryUrlForTags([tag]), title: `Show manga tagged ${tag}` }, tag))),
      meta.description ? h('p', { class: 'desc' }, meta.description) : null,
      h('div', { class: 'actions' },
        M.continue ? h('a', { class: 'btn primary', href: readUrl(M.id, M.continue.c, M.continue.v) }, M.continue.text) : null,
        follow))));

  let storyRhythm = null;
  if (M.collections?.length || M.relations?.length) main.append(h('section', { class: 'card' },
    h('h2', {}, 'Collections & related manga'),
    h('div', { class: 'chips' }, (M.collections || []).map(c => h('a', { class: 'btn', href: 'collection.html?' + qsa({ id: c.id }) }, c.title))),
    (M.relations || []).map(r => h('p', {}, h('a', { href: mangaUrl(r.otherId) }, r.otherTitle),
      ` · ${r.from === M.id ? 'target is ' : 'this manga is '}${r.type.replaceAll('-', ' ')}`,
      h('details', {}, h('summary', {}, 'Evidence'), h('p', { class: 'muted' }, r.explanation),
        r.evidence.map(e => h('a', { class: 'btn small', href: safeHref(e.url), target: '_blank', rel: 'noopener' }, e.provider || 'Source')))))));
  if (M.reading && M.reading.activeMs > 0) {
    const lastChapter = M.chapters.find(chapter => chapter.id === M.reading.lastChapterId);
    storyRhythm = h('div', { class: 'story-rhythm', role: 'list', 'aria-label': 'Completed chapter reading times' });
    const openKey = `reading-story-open.${me.name}`;
    const story = h('details', { class: 'reading-story card', open: store.get(openKey) !== '0' },
      h('summary', { class: 'reading-story-summary' },
        h('span', {}, h('span', { 'aria-hidden': 'true' }, '⏱ '), h('b', {}, 'Your Reading Story')),
        h('span', { class: 'muted small' }, readingDuration(M.reading.activeMs) + ' together')),
      h('div', { class: 'story-stats' },
        storyStat(readingDuration(M.reading.activeMs), 'time together'),
        storyStat(M.reading.timedChapters, `chapter${M.reading.timedChapters === 1 ? '' : 's'} timed`),
        storyStat(M.reading.typicalChapterMs ? readingDuration(M.reading.typicalChapterMs) : '—', 'typical chapter'),
        storyStat(M.reading.rereads, `reread${M.reading.rereads === 1 ? '' : 's'}`)),
      lastChapter ? h('p', { class: 'story-last muted' }, 'Last timed ',
        h('a', { href: readUrl(M.id, lastChapter.id) }, `${lastChapter.label}${lastChapter.title ? ' · ' + lastChapter.title : ''}`),
        ` · ${ago(M.reading.updatedAt)}`) : null,
      h('div', { class: 'story-rhythm-head' }, h('b', {}, 'Reading rhythm'), h('span', { class: 'muted small' }, 'Completed chapters · active time')),
      storyRhythm,
      h('div', { class: 'story-actions' },
        h('span', { class: 'muted small' }, 'Only you can see these measurements.'),
        h('button', { class: 'btn small', onclick: async () => {
          if (!confirm(`Forget all reading time recorded for ${M.title}? Reading progress is kept.`)) return;
          await api('api/reading/delete', { m: M.id });
          location.reload();
        } }, 'Forget this manga’s time')));
    story.addEventListener('toggle', () => store.set(openKey, story.open ? '1' : '0'));
    main.append(story);
    drawStoryRhythm();
  }

  function storyStat(value, label) {
    return h('div', { class: 'story-stat' }, h('strong', {}, value), h('span', { class: 'muted small' }, label));
  }

  function drawStoryRhythm() {
    if (!storyRhythm) return;
    const chapters = M.chapters.filter(chapter => !selectedBooks.size || selectedBooks.has(chapter.book));
    const completed = chapters.map(chapter => chapter.reading?.lastCompleteMs || 0).filter(Boolean);
    const scale = Math.max(1, ...completed.map(value => Math.log1p(value)));
    storyRhythm.textContent = '';
    for (const chapter of chapters) {
      const value = chapter.reading?.lastCompleteMs || 0;
      const label = `${chapter.label}${chapter.title ? ' · ' + chapter.title : ''}`;
      if (!value) {
        storyRhythm.append(h('span', { class: 'rhythm-bar empty', role: 'listitem', title: `${label} · Not timed`, 'aria-label': `${label}, not timed` }));
        continue;
      }
      const height = Math.max(12, Math.round(12 + 48 * Math.log1p(value) / scale));
      const passes = chapter.reading.completedPasses;
      const title = `${label} · ${readingDuration(value)}${passes > 1 ? ` · ${passes} timed reads · ${readingDuration(chapter.reading.totalActiveMs)} total` : ''}`;
      storyRhythm.append(h('a', {
        class: 'rhythm-bar', role: 'listitem', href: readUrl(M.id, chapter.id), title,
        'aria-label': title, style: `height:${height}px`,
      }));
    }
    if (!chapters.length) storyRhythm.append(h('span', { class: 'muted small' }, 'No chapters in the selected volumes.'));
  }

  const metadata = h('dl', { class: 'meta-grid' });
  function addMeta(label, value) {
    if (value == null || value === '' || (Array.isArray(value) && !value.length)) return;
    metadata.append(h('dt', {}, label), h('dd', {}, value instanceof Node ? value : text(value)));
  }
  addMeta('Title', meta.title || M.title);
  addMeta('Alternative titles', arr(meta.altTitles));
  addMeta('Authors', arr(meta.authors));
  addMeta('Status', meta.status);
  addMeta('First release', releaseDate());
  addMeta('Format', meta['x-anilist'] && meta['x-anilist'].format);
  addMeta('Reading style', TYPE[M.direction] || M.direction);
  addMeta('Volumes', M.books.length);
  addMeta('Chapters', M.chapters.length);
  addMeta('Library ID', M.id);
  addMeta('Tags', h('span', { class: 'meta-tags' }, tags.map(tag => h('a', { class: 'chip chip-link', href: libraryUrlForTags([tag]) }, tag))));
  if (sources.length) addMeta('Content sources', h('span', { class: 'meta-links' }, sources.map(source => {
    const label = source.name || source.url;
    return safeHref(source.url) ? h('a', { href: safeHref(source.url), target: '_blank', rel: 'noopener noreferrer' }, label) : h('span', {}, label);
  })));

  const anilist = meta['x-anilist'] || {};
  if (anilist.url || anilist.id) addMeta('AniList', safeHref(anilist.url)
    ? h('a', { href: safeHref(anilist.url), target: '_blank', rel: 'noopener noreferrer' }, anilist.id ? `Title ${anilist.id}` : 'Open title')
    : anilist.id);
  if (anilist.idMal) addMeta('MyAnimeList', h('a', { href: `https://myanimelist.net/manga/${encodeURIComponent(anilist.idMal)}`, target: '_blank', rel: 'noopener noreferrer' }, `Title ${anilist.idMal}`));
  if (anilist.coverUrl) addMeta('Metadata cover', safeHref(anilist.coverUrl)
    ? h('a', { href: safeHref(anilist.coverUrl), target: '_blank', rel: 'noopener noreferrer' }, 'Open source image') : anilist.coverUrl);

  const cover = meta['x-cover'] || {};
  addMeta('Cover provider', [cover.source, cover.label].filter(Boolean).join(' · '));
  if (cover.url) addMeta('Cover source', safeHref(cover.url)
    ? h('a', { href: safeHref(cover.url), target: '_blank', rel: 'noopener noreferrer' }, cover.url) : cover.url);
  const scraper = meta['x-scraper'] || {};
  addMeta('Auto update', typeof scraper.autoUpdate === 'boolean' ? (scraper.autoUpdate ? 'Enabled' : 'Disabled') : '');
  addMeta('Scraper strategy', scraper.strategy);
  addMeta('Source identifiers', scraper.ids);

  const handled = new Set(['title', 'altTitles', 'authors', 'status', 'year', 'firstReleaseDate', 'releaseDate', 'startDate', 'tags', 'description', 'direction', 'sources', 'x-anilist', 'x-cover', 'x-scraper']);
  for (const [key, value] of Object.entries(meta)) if (!handled.has(key)) addMeta(key, value);
  const rawMeta = h('details', { class: 'raw-meta' },
    h('summary', {}, 'Raw metadata'),
    h('pre', {}, JSON.stringify(meta, null, 2)));
  const metadataOpen = !window.matchMedia('(max-width: 640px)').matches;
  main.append(h('details', { class: 'metadata card', open: metadataOpen },
    h('summary', { class: 'metadata-summary' }, h('h2', {}, 'Metadata')),
    metadata, rawMeta));

  const volumeButtons = new Map();
  const volumeBar = h('div', { class: 'volume-filter', 'aria-label': 'Filter chapters by volume' });
  const allVolumes = h('button', { class: 'filter-chip', type: 'button' }, 'All volumes');
  allVolumes.onclick = () => { selectedBooks.clear(); drawVolumeFilter(); drawChapters(); drawStoryRhythm(); };
  volumeBar.append(allVolumes);
  for (const book of M.books) {
    const label = book.label + (book.title ? ' · ' + book.title : '');
    const button = h('button', { class: 'filter-chip', type: 'button', title: label }, label);
    button.onclick = () => { selectedBooks.has(book.key) ? selectedBooks.delete(book.key) : selectedBooks.add(book.key); drawVolumeFilter(); drawChapters(); drawStoryRhythm(); };
    volumeButtons.set(book.key, button);
    volumeBar.append(button);
  }
  const list = h('section', { class: 'chapters' });
  const empty = h('p', { class: 'muted chapter-empty', hidden: true }, 'No chapters match these volumes.');
  main.append(h('section', { class: 'chapter-section' },
    h('div', { class: 'chapter-heading' }, h('h2', {}, 'Chapters'), h('span', { class: 'muted small' }, 'Newest first')),
    volumeBar,
    h('div', { class: 'chapter-list-wrap' }, list), empty));

  function drawVolumeFilter() {
    allVolumes.classList.toggle('on', !selectedBooks.size);
    allVolumes.setAttribute('aria-pressed', String(!selectedBooks.size));
    for (const [key, button] of volumeButtons) {
      button.classList.toggle('on', selectedBooks.has(key));
      button.setAttribute('aria-pressed', String(selectedBooks.has(key)));
    }
  }

  function drawChapters() {
    list.textContent = '';
    const chapters = [...M.chapters].reverse().filter(chapter => !selectedBooks.size || selectedBooks.has(chapter.book));
    empty.hidden = !!chapters.length;
    let lastBook = null;
    for (const chapter of chapters) {
      if (chapter.book !== lastBook && M.books.length > 1) {
        const book = books[chapter.book];
        list.append(h('div', { class: 'book-sep' }, book.label + (book.title ? ' · ' + book.title : '')));
      }
      lastBook = chapter.book;
      list.append(chapterRow(chapter));
    }
  }

  function chapterRow(ch) {
    const wrap = h('div', { class: 'chapter-entry' });
    const panel = h('div', { class: 'versions', hidden: true });
    function draw() {
      const p = ch.progress, done = p && p.done;
      const readAt = done ? readDate(ch.readAt) : null;
      const state = h('button', { class: 'state' + (done ? ' done' : ''), title: (readAt ? readAt.title + ' · ' : '') + (done ? 'Mark as unread' : 'Mark as read') },
        done ? (readAt ? '✓ ' + readAt.text : '✓ read') : p ? `page ${p.p + 1} / ${p.n}` : 'unread');
      state.onclick = async () => {
        if (done) { await api('api/unread', { m: M.id, c: ch.id }); ch.progress = null; ch.readAt = null; }
        else {
          const version = ch.versions[0];
          await api('api/progress', { m: M.id, c: ch.id, v: version.id, p: version.pages - 1, n: version.pages, done: true });
          ch.progress = { v: version.id, p: version.pages - 1, n: version.pages, done: true };
          ch.readAt = { at: Date.now(), approx: false };
        }
        draw();
      };
      const verBtn = ch.versions.length > 1
        ? h('button', { class: 'btn small', onclick: () => { panel.hidden = !panel.hidden; } }, ch.versions.length + ' versions')
        : null;
      const pages = ch.versions[0] ? ch.versions[0].pages : 0;
      const timing = chapterTiming(ch), released = chapterRelease(ch.dates);
      wrap.textContent = '';
      wrap.append(h('div', { class: 'ch' + (done ? ' read' : '') },
        h('a', { class: 'ch-main' + (timing ? ' has-time' : '') + (M.chapterDates?.release ? ' has-date' : ''), href: readUrl(M.id, ch.id) },
          h('span', { class: 'ch-label' }, ch.label),
          h('span', { class: 'ch-pages' }, `${pages} p.`),
          M.chapterDates?.release ? h('span', { class: 'ch-date' + (released ? ' tier-' + released.tier : ''), title: released ? released.title : 'No date known', 'aria-label': released ? released.title : 'No date known' },
            released ? released.text : '–') : null,
          timing ? h('span', { class: 'ch-time', title: timing.title, 'aria-label': timing.title }, timing.text) : null,
          h('span', { class: 'ch-title', title: ch.title || '' }, ch.title || 'Untitled'),
          ch.extra ? h('span', { class: 'tag' }, 'extra') : null),
        verBtn, state), panel);
      drawVersions();
    }
    function drawVersions() {
      panel.textContent = '';
      panel.append(h('div', { class: 'muted small', style: 'padding-top:6px' }, 'The best rated version opens by default. Vote to change that for everyone.'));
      ch.versions.forEach((version, i) => {
        const vote = async value => { ch.versions = (await api('api/vote', { m: M.id, c: ch.id, v: version.id, value: version.my === value ? 0 : value })).versions; drawVersions(); };
        panel.append(h('div', { class: 'ver' },
          h('div', { class: 'src' },
            safeHref(version.sourceUrl) ? h('a', { href: safeHref(version.sourceUrl), target: '_blank', rel: 'noopener noreferrer' }, version.source || version.id) : h('span', {}, version.source || version.id),
            i === 0 ? h('span', { class: 'tag', style: 'margin-left:8px' }, 'default') : null,
            h('div', { class: 'muted small' }, `${version.pages} pages · added ${new Date(version.added).toLocaleDateString()}`)),
          h('span', { class: 'vote' },
            h('button', { class: version.my > 0 ? 'on' : '', title: 'Better', onclick: () => vote(1) }, '▲'),
            h('b', {}, version.score),
            h('button', { class: version.my < 0 ? 'on' : '', title: 'Worse', onclick: () => vote(-1) }, '▼')),
          h('a', { class: 'btn small', href: readUrl(M.id, ch.id, version.id) }, 'Read')));
      });
    }
    draw();
    return wrap;
  }

  // Phones (the chapter-row breakpoint in app.css) get numeric dates to leave room for titles.
  const compact = matchMedia('(max-width: 640px)').matches;

  // Read date: the day and the hour (local time) the chapter was first completed.
  function readDate(value) {
    const mode = M.chapterDates?.read;
    if (!value || !value.at || mode === 'off') return null;
    const when = new Date(value.at), thisYear = when.getFullYear() === new Date().getFullYear();
    const day = when.toLocaleDateString(undefined, compact ? { day: '2-digit', month: '2-digit', ...(thisYear ? {} : { year: '2-digit' }) }
      : { day: 'numeric', month: 'short', ...(thisYear ? {} : { year: 'numeric' }) });
    const text = (value.approx ? '≤ ' : '') + day + (mode === 'hour' ? `, ${String(when.getHours()).padStart(2, '0')}h` : '');
    const full = when.toLocaleDateString(undefined, { dateStyle: 'long' }) + (mode === 'hour' ? `, ${String(when.getHours()).padStart(2, '0')}:00–${String((when.getHours() + 1) % 24).padStart(2, '0')}:00` : '');
    return { text, title: (value.approx ? 'Read by ' : 'Read on ') + full + (value.approx ? ' (earlier reads were not recorded)' : '') };
  }

  // Release date by tier: official > source upload > Manga Circus ecosystem > this library.
  const TIER = { official: { mark: '' }, source: { mark: '≈' }, ecosystem: { mark: '◎' }, library: { mark: '↓' } };
  const dayText = (at, precision, long) => {
    // Day-precision dates are calendar dates, not instants: show them in UTC so they do not shift.
    const dayOnly = !String(at).includes('T');
    const opts = precision === 'year' ? { year: 'numeric' } : precision === 'month' ? { year: 'numeric', month: 'short' }
      : long ? { dateStyle: 'long' } : compact ? { day: '2-digit', month: '2-digit', year: '2-digit' } : { day: 'numeric', month: 'short', year: 'numeric' };
    return new Date(at).toLocaleDateString(undefined, { ...opts, ...(dayOnly ? { timeZone: 'UTC' } : {}) });
  };
  function chapterRelease(dates) {
    if (!dates || !dates.release) return null;
    const known = dates.known || {}, lines = [];
    if (known.official) lines.push(`Released ${dayText(known.official.at, known.official.precision, true)}${known.official.name ? ' (' + known.official.name + ')' : ''}`);
    if (known.source) lines.push(`Uploaded at ${known.source.name || 'the source'} ${dayText(known.source.at, 'day', true)}`);
    if (known.batch) lines.push(`Bulk upload at ${known.batch.name || 'the source'} ${dayText(known.batch.at, 'day', true)} (not a release date)`);
    if (known.ecosystem) lines.push(`First in Manga Circus ${dayText(known.ecosystem.at, 'day', true)}${known.ecosystem.name && known.ecosystem.name !== 'this server' ? ' (via ' + known.ecosystem.name + ')' : ''}`);
    if (known.library) lines.push(`Added to this library ${dayText(known.library.at, 'day', true)}`);
    const tier = TIER[dates.tier] || TIER.library;
    return { tier: dates.tier, text: tier.mark + dayText(dates.release.at, dates.release.precision), title: lines.join('\n') };
  }

  function chapterTiming(chapter) {
    if (!M.reading) return null;
    const value = chapter.reading;
    if (!value) return { text: 'Not timed', title: 'No reading time recorded' };
    if (value.completedPasses) {
      const text = readingDuration(value.lastCompleteMs, true) + (value.completedPasses > 1 ? ` ↻${value.completedPasses}` : '');
      return {
        text,
        title: `Last timed read ${readingDuration(value.lastCompleteMs)}; ${value.completedPasses} timed read${value.completedPasses === 1 ? '' : 's'}; ${readingDuration(value.totalActiveMs)} total`,
      };
    }
    const active = value.currentPassMs || value.totalActiveMs;
    return { text: `◷ ${readingDuration(active, true)}`, title: `${readingDuration(active)} active; current pass in progress` };
  }

  drawVolumeFilter();
  drawChapters();
})();