/**
 * Utility to add a Deezer track to the download queue
 * Used by both search results and services/deezer pages
 */

import { deezerAPI } from '$lib/services/deezer';
import { addToQueue } from '$lib/stores/downloadQueue';
import { settings } from '$lib/stores/settings';
import { deezerAuth } from '$lib/stores/deezer';
import { trackExists } from './downloader';
import { setInfo, setWarning } from '$lib/stores/status';
import { get } from 'svelte/store';

/**
 * Fetch track metadata and add to download queue
 * Respects the overwrite setting - skips tracks that already exist if overwrite is false
 * @param trackId - Deezer track ID
 * @returns Promise that resolves when track is added to queue (or skipped message)
 */
export async function addDeezerTrackToQueue(trackId: string): Promise<{ added: boolean; reason?: string }> {
  // Ensure ARL is set for authentication
  const authState = get(deezerAuth);
  if (authState.arl) {
    deezerAPI.setArl(authState.arl);
  }

  // Fetch full track data from GW API
  const trackInfo = await deezerAPI.getTrack(trackId);

  if (!trackInfo || !trackInfo.SNG_ID) {
    throw new Error('Track not found or invalid track ID');
  }

  // Fetch album data for cover art URLs
  let albumData = null;
  try {
    albumData = await deezerAPI.getAlbumData(trackInfo.ALB_ID.toString());
  } catch (error) {
    console.warn('[AddToQueue] Could not fetch album data:', error);
  }

  // Fetch lyrics
  let lyricsData = null;
  try {
    lyricsData = await deezerAPI.getLyrics(trackInfo.SNG_ID.toString());
  } catch (error) {
    console.warn('[AddToQueue] Could not fetch lyrics:', error);
  }

  // Parse lyrics if available
  let lyrics = undefined;
  if (lyricsData) {
    // Parse LRC format (synced lyrics)
    let syncLrc = '';
    if (lyricsData.LYRICS_SYNC_JSON) {
      for (const line of lyricsData.LYRICS_SYNC_JSON) {
        const text = line.line || '';
        const timestamp = line.lrc_timestamp || '[00:00.00]';
        syncLrc += `${timestamp}${text}\n`;
      }
    }

    lyrics = {
      sync: syncLrc || undefined,
      unsync: lyricsData.LYRICS_TEXT || undefined,
      syncID3: undefined // No longer needed, handled by Rust tagger
    };
  }

  // Build track object with enhanced metadata
  const track = {
    id: trackInfo.SNG_ID,
    title: trackInfo.SNG_TITLE,
    artist: trackInfo.ART_NAME,
    artistId: trackInfo.ART_ID,
    artists: [trackInfo.ART_NAME],
    album: trackInfo.ALB_TITLE,
    albumId: trackInfo.ALB_ID,
    albumArtist: trackInfo.ART_NAME,
    albumArtistId: trackInfo.ART_ID,
    trackNumber: typeof trackInfo.TRACK_NUMBER === 'number' ? trackInfo.TRACK_NUMBER : parseInt(trackInfo.TRACK_NUMBER, 10),
    discNumber: typeof trackInfo.DISK_NUMBER === 'number' ? trackInfo.DISK_NUMBER : parseInt(trackInfo.DISK_NUMBER, 10),
    duration: typeof trackInfo.DURATION === 'number' ? trackInfo.DURATION : parseInt(trackInfo.DURATION, 10),
    explicit: trackInfo.EXPLICIT_LYRICS === 1,
    md5Origin: trackInfo.MD5_ORIGIN,
    mediaVersion: trackInfo.MEDIA_VERSION,
    trackToken: trackInfo.TRACK_TOKEN,
    // Enhanced metadata
    lyrics,
    albumCoverUrl: albumData?.ALB_PICTURE ? `https://e-cdns-images.dzcdn.net/images/cover/${albumData.ALB_PICTURE}/500x500-000000-80-0-0.jpg` : undefined,
    albumCoverXlUrl: albumData?.ALB_PICTURE ? `https://e-cdns-images.dzcdn.net/images/cover/${albumData.ALB_PICTURE}/1000x1000-000000-80-0-0.jpg` : undefined,
    label: albumData?.LABEL_NAME,
    barcode: albumData?.UPC,
    releaseDate: trackInfo.PHYSICAL_RELEASE_DATE,
    genre: trackInfo.GENRE ? [trackInfo.GENRE] : undefined,
    copyright: trackInfo.COPYRIGHT
  };

  // Check if we should skip this track (if it exists and overwrite is false)
  const appSettings = get(settings);

  if (!appSettings.deezerOverwrite && appSettings.musicFolder) {
    const exists = await trackExists(track, appSettings.musicFolder, appSettings.deezerFormat);

    if (exists) {
      console.log(`[AddToQueue] Skipping "${track.title}" - already exists`);
      setWarning(`Skipped: ${track.title} (already exists)`);
      return { added: false, reason: 'already_exists' };
    }
  }

  // Add to queue (queue manager runs continuously in background)
  await addToQueue({
    source: 'deezer',
    type: 'track',
    title: track.title,
    artist: track.artist,
    totalTracks: 1,
    downloadObject: track
  });

  setInfo(`Queued: ${track.title}`);
  return { added: true };
}