import { S } from '../state.js';
import { esc, formatDur, toast } from '../utils.js';
import { api, coverUrl, fetchRomajiIndex, romajiLookup, getRomajiOverrides } from '../api.js';
// Circular — safe (only used inside function bodies)
import { loadPlaylists, loadPlaylistDetail } from '../views/views.js';
import { showConfirm } from './modals.js';

// ─── SONG INFO MODAL ───
function _fmtArtists(str, sep) {
  if (!str) return '';
  return str.split(/\s*[•·;,]\s*/).map(s => s.trim()).filter(Boolean).join(sep);
}

function _renderInfoModal(s) {
  const cv = coverUrl(s.coverArt, 200);
  document.getElementById('info-cover').innerHTML = cv
    ? `<img src="${cv}" style="width:100%;height:100%;object-fit:cover">`
    : '<div class="no-art" style="width:100%;height:100%;display:flex;align-items:center;justify-content:center;font-size:32px">🎵</div>';
  document.getElementById('info-top-title').textContent = s.title || '—';
  document.getElementById('info-top-sub').textContent = (s.artist||'—') + (s.album ? ' · '+s.album : '');
  const fields = [
    ['Titel',          s.title],
    ['Künstler',       s.artist],
    ['Album-Künstler', s.albumArtist],
    ['Album',          s.album],
    ['Jahr',        s.year],
    ['Track #',     s.track],
    ['Disc #',      s.discNumber],
    ['Genre',       s.genre],
    ['Dauer',       formatDur(s.duration)],
    ['Bitrate',     s.bitRate ? s.bitRate+' kbps' : null],
    ['Format',      s.suffix?.toUpperCase()],
    ['Dateigröße',  s.size ? Math.round(s.size/1024/1024*10)/10+' MB' : null],
    ['Pfad',        s.path],
    ['Plays',       s.playCount],
  ].filter(([,v]) => v!=null && v!=='' && v!==undefined);
  document.getElementById('info-rows').innerHTML = fields.map(([l,v]) =>
    `<div class="info-row"><span class="info-label">${l}</span><span class="info-val">${esc(String(v))}</span></div>`
  ).join('');
}

export async function showSongInfo(s) {
  S.infoSong = s;
  S._infoArtData = null;
  document.getElementById('info-modal').classList.add('open');
  _leaveEditMode();
  _renderInfoModal(s);
  try {
    const r = await api('getSong', `&id=${s.id}`);
    const full = r.song;
    if (full) {
      if (!full.albumArtist && full.albumId) {
        try {
          const ar = await api('getAlbum', `&id=${full.albumId}`);
          if (ar.album?.artist) full.albumArtist = ar.album.artist;
        } catch {}
      }
      S.infoSong = full;
      _renderInfoModal(full);
      if (document.getElementById('info-edit-mode').style.display !== 'none') {
        document.getElementById('ie-title').value       = full.title                          || '';
        document.getElementById('ie-artist').value      = _fmtArtists(full.artist, '; ')    || '';
        document.getElementById('ie-albumartist').value = _fmtArtists(full.albumArtist, ', ') || '';
        document.getElementById('ie-album').value       = full.album                         || '';
        document.getElementById('ie-genre').value       = full.genre        || '';
        document.getElementById('ie-year').value        = full.year         || '';
        document.getElementById('ie-track').value       = full.track        || '';
        document.getElementById('ie-disc').value        = full.discNumber   || '';
        document.getElementById('ie-totaltracks').value = full.albumSongCount || '';
      }
    }
  } catch {}
}
export function closeInfoModal() {
  document.getElementById('info-modal').classList.remove('open');
  _leaveEditMode();
  S.infoSong = null;
  S._infoArtData = null;
}

function _leaveEditMode() {
  document.getElementById('info-view-mode').style.display = '';
  document.getElementById('info-edit-mode').style.display = 'none';
  document.getElementById('info-edit-toggle').classList.remove('active');
  document.getElementById('info-edit-status').textContent = '';
}

export function toggleInfoEdit() {
  const editEl = document.getElementById('info-edit-mode');
  const viewEl = document.getElementById('info-view-mode');
  const btn    = document.getElementById('info-edit-toggle');
  const isEdit = editEl.style.display !== 'none';
  if (isEdit) { _leaveEditMode(); return; }

  const s = S.infoSong;
  if (!s) return;
  editEl.style.display = '';
  viewEl.style.display = 'none';
  btn.classList.add('active');

  document.getElementById('ie-title').value       = s.title                       || '';
  document.getElementById('ie-artist').value      = _fmtArtists(s.artist, '; ')   || '';
  document.getElementById('ie-albumartist').value = _fmtArtists(s.albumArtist, ', ') || '';
  document.getElementById('ie-album').value       = s.album                       || '';
  document.getElementById('ie-genre').value       = s.genre        || '';
  document.getElementById('ie-year').value        = s.year         || '';
  document.getElementById('ie-track').value       = s.track        || '';
  document.getElementById('ie-disc').value        = s.discNumber   || '';
  document.getElementById('ie-totaltracks').value = s.albumSongCount || '';

  document.getElementById('ie-titlesort').value       = '';
  document.getElementById('ie-artistsort').value      = '';
  document.getElementById('ie-albumartistsort').value = '';
  document.getElementById('ie-albumsort').value       = '';

  const _sId = s.id;
  fetchRomajiIndex().catch(() => null).then(() => {
    const rm = romajiLookup(_sId);
    if (rm) {
      const _jp = /[ぁ-んァ-ン一-龯]/;
      if (rm.titleRomaji  && !_jp.test(rm.titleRomaji))  document.getElementById('ie-titlesort').value       = rm.titleRomaji;
      if (rm.artistRomaji && !_jp.test(rm.artistRomaji)) {
        document.getElementById('ie-artistsort').value      = rm.artistRomaji;
        document.getElementById('ie-albumartistsort').value = rm.artistRomaji;
      }
      if (rm.albumRomaji  && !_jp.test(rm.albumRomaji))  document.getElementById('ie-albumsort').value       = rm.albumRomaji;
    }
    if (!S.cfg.backendUrl || !_sId) return null;
    const p = new URLSearchParams({ ndUrl: S.cfg.url, user: S.cfg.user, pass: S.cfg.pass, songId: _sId });
    return fetch(`${S.cfg.backendUrl}/api/song-sorttags?${p}`).then(r => r.ok ? r.json() : null).catch(() => null);
  }).then(t => {
    if (t) {
      const _jp = /[ぁ-んァ-ン一-龯]/;
      if (t.titleSort       && !_jp.test(t.titleSort))       document.getElementById('ie-titlesort').value       = t.titleSort;
      if (t.artistSort      && !_jp.test(t.artistSort))      document.getElementById('ie-artistsort').value      = t.artistSort;
      if (t.albumArtistSort && !_jp.test(t.albumArtistSort)) document.getElementById('ie-albumartistsort').value = t.albumArtistSort;
      if (t.albumSort       && !_jp.test(t.albumSort))       document.getElementById('ie-albumsort').value       = t.albumSort;
    }
    const ov = getRomajiOverrides();
    if (s.artist     && ov[s.artist])     { document.getElementById('ie-artistsort').value      = ov[s.artist]; document.getElementById('ie-albumartistsort').value = ov[s.artist]; }
    if (s.albumArtist && ov[s.albumArtist]) document.getElementById('ie-albumartistsort').value = ov[s.albumArtist];
    if (s.title      && ov[s.title])       document.getElementById('ie-titlesort').value        = ov[s.title];
    if (s.album      && ov[s.album])       document.getElementById('ie-albumsort').value        = ov[s.album];
  }).catch(() => {});

  const cv = coverUrl(s.coverArt, 200);
  const prev = document.getElementById('info-edit-art-preview');
  prev.innerHTML = cv
    ? `<img src="${cv}" style="width:100%;height:100%;object-fit:cover">`
    : '<div class="no-art" style="width:100%;height:100%;display:flex;align-items:center;justify-content:center;font-size:28px">🎵</div>';
  S._infoArtData = null;
}

export function onInfoArtFile(input) {
  const file = input.files?.[0];
  if (!file) return;
  const reader = new FileReader();
  reader.onload = e => {
    const dataUrl = e.target.result;
    const base64  = dataUrl.split(',')[1];
    S._infoArtData = { base64, mime: file.type };
    document.getElementById('info-edit-art-preview').innerHTML =
      `<img src="${dataUrl}" style="width:100%;height:100%;object-fit:cover">`;
  };
  reader.readAsDataURL(file);
}

export async function autofillMusicBrainz() {
  if (!S.cfg.backendUrl) { toast('⚠ Kein Backend konfiguriert'); return; }
  const s = S.infoSong;
  if (!s) return;
  const artist = document.getElementById('ie-artist').value || s.artist || '';
  const title  = document.getElementById('ie-title').value  || s.title  || '';
  const status = document.getElementById('info-edit-status');
  status.textContent = '🔍 MusicBrainz…';
  try {
    const r = await fetch(`${S.cfg.backendUrl}/api/musicbrainz/lookup?artist=${encodeURIComponent(artist)}&title=${encodeURIComponent(title)}`);
    const d = await r.json();
    if (!d.found) { status.textContent = '❌ Kein Treffer auf MusicBrainz'; return; }
    if (d.title)       document.getElementById('ie-title').value       = d.title;
    if (d.artist)      document.getElementById('ie-artist').value      = d.artist;
    if (d.album)       document.getElementById('ie-album').value       = d.album;
    if (d.genre)       document.getElementById('ie-genre').value       = d.genre;
    if (d.year)        document.getElementById('ie-year').value        = d.year;
    if (d.trackNum)    document.getElementById('ie-track').value       = d.trackNum;
    if (d.totalTracks) document.getElementById('ie-totaltracks').value = d.totalTracks;
    if (d.coverUrl) {
      status.textContent = '✅ Metadaten gefunden — Cover wird geladen…';
      S._infoArtData = { url: d.coverUrl };
      document.getElementById('info-edit-art-preview').innerHTML =
        `<img src="${d.coverUrl}" style="width:100%;height:100%;object-fit:cover" onerror="this.parentNode.innerHTML='<div class=\\'no-art\\' style=\\'width:100%;height:100%;display:flex;align-items:center;justify-content:center;font-size:28px\\'>🎵</div>'">`;
      status.textContent = '✅ Metadaten + Cover von MusicBrainz';
    } else {
      status.textContent = '✅ Metadaten von MusicBrainz (kein Cover)';
    }
  } catch (e) {
    status.textContent = '❌ Fehler: ' + e.message;
  }
}

export async function autofillItunes() {
  if (!S.cfg.backendUrl) { toast('⚠ Kein Backend konfiguriert'); return; }
  const s = S.infoSong;
  if (!s) return;
  const artist = document.getElementById('ie-artist').value || s.artist || '';
  const title  = document.getElementById('ie-title').value  || s.title  || '';
  const status = document.getElementById('info-edit-status');
  status.textContent = '🔍 Apple Music…';
  try {
    const r = await fetch(`${S.cfg.backendUrl}/api/itunes/lookup?artist=${encodeURIComponent(artist)}&title=${encodeURIComponent(title)}`);
    const d = await r.json();
    if (!d.found) { status.textContent = '❌ Kein Treffer auf iTunes'; return; }
    if (d.album)       document.getElementById('ie-album').value = d.album;
    if (d.genre)       document.getElementById('ie-genre').value = d.genre;
    if (d.year)        document.getElementById('ie-year').value  = d.year;
    if (d.trackNum)    document.getElementById('ie-track').value = d.trackNum;
    if (d.totalTracks) document.getElementById('ie-totaltracks').value = d.totalTracks;
    if (d.coverUrl) {
      S._infoArtData = { url: d.coverUrl };
      document.getElementById('info-edit-art-preview').innerHTML =
        `<img src="${d.coverUrl}" style="width:100%;height:100%;object-fit:cover" onerror="this.parentNode.innerHTML='<div class=\\'no-art\\' style=\\'width:100%;height:100%;display:flex;align-items:center;justify-content:center;font-size:28px\\'>🎵</div>'">`;
      status.textContent = '✅ Metadaten + Cover von Apple Music';
    } else {
      status.textContent = '✅ Metadaten von Apple Music (kein Cover)';
    }
  } catch (e) {
    status.textContent = '❌ Fehler: ' + e.message;
  }
}

export async function saveMetadata() {
  if (!S.cfg.backendUrl) { toast('⚠ Kein Backend konfiguriert'); return; }
  const s = S.infoSong;
  if (!s?.id) return;
  const status = document.getElementById('info-edit-status');
  status.textContent = '💾 Speichern…';

  const body = {
    ndUrl:          S.cfg.url,
    user:           S.cfg.user,
    pass:           S.cfg.pass,
    songId:         s.id,
    title:          document.getElementById('ie-title').value       || undefined,
    artist:         document.getElementById('ie-artist').value      || undefined,
    albumArtist:    document.getElementById('ie-albumartist').value || undefined,
    album:          document.getElementById('ie-album').value       || undefined,
    genre:          document.getElementById('ie-genre').value       || undefined,
    year:           parseInt(document.getElementById('ie-year').value)        || undefined,
    trackNum:       parseInt(document.getElementById('ie-track').value)       || undefined,
    totalTracks:    parseInt(document.getElementById('ie-totaltracks').value) || undefined,
    discNum:        parseInt(document.getElementById('ie-disc').value)        || undefined,
    titleSort:      document.getElementById('ie-titlesort').value        || undefined,
    artistSort:     document.getElementById('ie-artistsort').value       || undefined,
    albumArtistSort:document.getElementById('ie-albumartistsort').value  || undefined,
    albumSort:      document.getElementById('ie-albumsort').value        || undefined,
  };
  if (S._infoArtData?.base64) {
    body.artworkBase64 = S._infoArtData.base64;
    body.artworkMime   = S._infoArtData.mime || 'image/jpeg';
  } else if (S._infoArtData?.url) {
    body.artworkUrl = S._infoArtData.url;
  }

  try {
    const r = await fetch(`${S.cfg.backendUrl}/api/edit-metadata`, {
      method: 'POST', headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(body),
    });
    const d = await r.json();
    if (!r.ok) throw new Error(d.error || `HTTP ${r.status}`);
    status.textContent = '✅ Gespeichert! Navidrome scannt…';
    toast('✅ Metadaten gespeichert');
    setTimeout(() => { _leaveEditMode(); closeInfoModal(); }, 1500);
  } catch (e) {
    status.textContent = '❌ Fehler: ' + e.message;
  }
}

export async function deleteSong() {
  if (!S.cfg.backendUrl) { toast('⚠ Kein Backend konfiguriert'); return; }
  const s = S.infoSong;
  if (!s?.id) return;
  const ok = await showConfirm(
    'Song löschen',
    `"${s.title}" wird unwiderruflich von der Festplatte gelöscht. Leere Album- und Künstlerordner werden ebenfalls entfernt.`,
    'Löschen'
  );
  if (!ok) return;
  const status = document.getElementById('info-edit-status');
  status.textContent = '🗑 Löschen…';
  try {
    const r = await fetch(`${S.cfg.backendUrl}/api/delete-song`, {
      method: 'POST', headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ ndUrl: S.cfg.url, user: S.cfg.user, pass: S.cfg.pass, songId: s.id }),
    });
    const d = await r.json();
    if (!r.ok) throw new Error(d.error || `HTTP ${r.status}`);
    toast(`🗑 "${s.title}" gelöscht`);
    closeInfoModal();
    setTimeout(() => {
      loadPlaylists();
      if (document.getElementById('page-playlist-detail')?.classList.contains('active') && S._currentPlaylist)
        loadPlaylistDetail(S._currentPlaylist);
    }, 3000);
  } catch (e) {
    status.textContent = '❌ Fehler: ' + e.message;
  }
}