feat(spotify): hook existing download queue

src/lib/services/spotify/playlistDownloader.ts

@@ -0,0 +1,233 @@
+/**
+ * Download Spotify playlist - converts tracks to Deezer via ISRC, adds to queue, and creates m3u8 file
+ */
+
+import { addToQueue } from '$lib/stores/downloadQueue';
+import { trackExists } from '$lib/services/deezer/downloader';
+import { writeM3U8, makeRelativePath, type M3U8Track } from '$lib/library/m3u8';
+import { generateTrackPath } from '$lib/services/deezer/paths';
+import { settings } from '$lib/stores/settings';
+import { deezerAuth } from '$lib/stores/deezer';
+import { deezerAPI } from '$lib/services/deezer';
+import { setInfo, setSuccess, setWarning } from '$lib/stores/status';
+import { get } from 'svelte/store';
+import { mkdir } from '@tauri-apps/plugin-fs';
+import { convertSpotifyTrackToDeezer, type SpotifyTrackInput } from './converter';
+import type { DeezerTrack } from '$lib/types/deezer';
+
+export interface SpotifyPlaylistTrack {
+  id: number | string;
+  track_id: string;
+  name: string;
+  artist_name: string;
+  album_name: string;
+  duration_ms: number;
+  isrc?: string | null;
+}
+
+/**
+ * Download a Spotify playlist by converting tracks to Deezer equivalents
+ * - Converts all tracks via ISRC matching
+ * - Adds converted tracks to the download queue (respects overwrite setting)
+ * - Creates an m3u8 playlist file with relative paths
+ *
+ * @param playlistName - Name of the playlist
+ * @param spotifyTracks - Array of Spotify track objects
+ * @param playlistsFolder - Path to playlists folder
+ * @param musicFolder - Path to music folder
+ * @returns Object with m3u8 path and statistics
+ */
+export async function downloadSpotifyPlaylist(
+  playlistName: string,
+  spotifyTracks: SpotifyPlaylistTrack[],
+  playlistsFolder: string,
+  musicFolder: string
+): Promise<{
+  m3u8Path: string;
+  stats: {
+    total: number;
+    queued: number;
+    skipped: number;
+    failed: number;
+  };
+}> {
+  const appSettings = get(settings);
+  const authState = get(deezerAuth);
+
+  // Ensure Deezer is authenticated
+  if (!authState.loggedIn || !authState.arl) {
+    throw new Error('Deezer authentication required for downloads');
+  }
+
+  deezerAPI.setArl(authState.arl);
+
+  console.log(`[SpotifyPlaylistDownloader] Starting download for playlist: ${playlistName}`);
+  console.log(`[SpotifyPlaylistDownloader] Tracks: ${spotifyTracks.length}`);
+
+  // Ensure playlists folder exists
+  try {
+    await mkdir(playlistsFolder, { recursive: true });
+  } catch (error) {
+    // Folder might already exist
+  }
+
+  // Track statistics
+  let queuedCount = 0;
+  let skippedCount = 0;
+  let failedCount = 0;
+
+  // Track successful conversions for m3u8 generation
+  const successfulTracks: Array<{
+    deezerTrack: DeezerTrack;
+    spotifyTrack: SpotifyPlaylistTrack;
+  }> = [];
+
+  // Convert and queue each track
+  for (const spotifyTrack of spotifyTracks) {
+    try {
+      // Convert Spotify track to Deezer
+      const conversionInput: SpotifyTrackInput = {
+        id: spotifyTrack.track_id,
+        name: spotifyTrack.name,
+        artists: [spotifyTrack.artist_name],
+        album: spotifyTrack.album_name,
+        duration_ms: spotifyTrack.duration_ms,
+        isrc: spotifyTrack.isrc
+      };
+
+      const conversionResult = await convertSpotifyTrackToDeezer(conversionInput);
+
+      if (!conversionResult.success || !conversionResult.deezerTrack) {
+        console.warn(
+          `[SpotifyPlaylistDownloader] Failed to convert: ${spotifyTrack.name} - ${conversionResult.error}`
+        );
+        failedCount++;
+        continue;
+      }
+
+      const deezerPublicTrack = conversionResult.deezerTrack;
+
+      // Fetch full track data from Deezer GW API (needed for download)
+      const deezerTrackId = deezerPublicTrack.id.toString();
+      const deezerFullTrack = await deezerAPI.getTrack(deezerTrackId);
+
+      if (!deezerFullTrack || !deezerFullTrack.SNG_ID) {
+        console.warn(`[SpotifyPlaylistDownloader] Could not fetch full Deezer track data for ID: ${deezerTrackId}`);
+        failedCount++;
+        continue;
+      }
+
+      // Build DeezerTrack object
+      const deezerTrack: DeezerTrack = {
+        id: parseInt(deezerFullTrack.SNG_ID, 10),
+        title: deezerFullTrack.SNG_TITLE,
+        artist: deezerFullTrack.ART_NAME,
+        artistId: parseInt(deezerFullTrack.ART_ID, 10),
+        artists: [deezerFullTrack.ART_NAME],
+        album: deezerFullTrack.ALB_TITLE,
+        albumId: parseInt(deezerFullTrack.ALB_ID, 10),
+        albumArtist: deezerFullTrack.ART_NAME,
+        albumArtistId: parseInt(deezerFullTrack.ART_ID, 10),
+        trackNumber:
+          typeof deezerFullTrack.TRACK_NUMBER === 'number'
+            ? deezerFullTrack.TRACK_NUMBER
+            : parseInt(deezerFullTrack.TRACK_NUMBER, 10),
+        discNumber:
+          typeof deezerFullTrack.DISK_NUMBER === 'number'
+            ? deezerFullTrack.DISK_NUMBER
+            : parseInt(deezerFullTrack.DISK_NUMBER, 10),
+        duration:
+          typeof deezerFullTrack.DURATION === 'number'
+            ? deezerFullTrack.DURATION
+            : parseInt(deezerFullTrack.DURATION, 10),
+        explicit: deezerFullTrack.EXPLICIT_LYRICS === 1,
+        md5Origin: deezerFullTrack.MD5_ORIGIN,
+        mediaVersion: deezerFullTrack.MEDIA_VERSION,
+        trackToken: deezerFullTrack.TRACK_TOKEN
+      };
+
+      // Check if track already exists (if overwrite is disabled)
+      if (!appSettings.deezerOverwrite && appSettings.musicFolder) {
+        const exists = await trackExists(deezerTrack, appSettings.musicFolder, appSettings.deezerFormat);
+        if (exists) {
+          console.log(`[SpotifyPlaylistDownloader] Skipping "${deezerTrack.title}" - already exists`);
+          skippedCount++;
+          // Still add to successful tracks for m3u8 generation
+          successfulTracks.push({ deezerTrack, spotifyTrack });
+          continue;
+        }
+      }
+
+      // Queue track for download
+      await addToQueue({
+        source: 'deezer',
+        type: 'track',
+        title: deezerTrack.title,
+        artist: deezerTrack.artist,
+        totalTracks: 1,
+        downloadObject: deezerTrack
+      });
+
+      queuedCount++;
+      successfulTracks.push({ deezerTrack, spotifyTrack });
+
+      console.log(
+        `[SpotifyPlaylistDownloader] Queued: ${deezerTrack.title} (matched via ${conversionResult.matchMethod})`
+      );
+    } catch (error) {
+      console.error(`[SpotifyPlaylistDownloader] Error processing track ${spotifyTrack.name}:`, error);
+      failedCount++;
+    }
+  }
+
+  console.log(
+    `[SpotifyPlaylistDownloader] Queued ${queuedCount} tracks, skipped ${skippedCount}, failed ${failedCount}`
+  );
+
+  // Show queue status message
+  if (queuedCount > 0) {
+    const parts = [`Queued ${queuedCount} track${queuedCount !== 1 ? 's' : ''}`];
+    if (skippedCount > 0) parts.push(`${skippedCount} skipped`);
+    if (failedCount > 0) parts.push(`${failedCount} not found`);
+    setInfo(parts.join(', '));
+  } else if (skippedCount > 0) {
+    setWarning(`All ${skippedCount} tracks already exist`);
+  } else if (failedCount > 0) {
+    setWarning(`Could not find ${failedCount} tracks on Deezer`);
+  }
+
+  // Generate m3u8 file using Deezer track paths
+  const m3u8Tracks: M3U8Track[] = successfulTracks.map(({ deezerTrack, spotifyTrack }) => {
+    // Generate expected path for this Deezer track
+    const paths = generateTrackPath(deezerTrack, musicFolder, appSettings.deezerFormat, false);
+    const absolutePath = `${paths.filepath}/${paths.filename}`;
+
+    // Convert to relative path from playlists folder
+    const relativePath = makeRelativePath(absolutePath, 'Music');
+
+    return {
+      duration: deezerTrack.duration,
+      artist: deezerTrack.artist,
+      title: deezerTrack.title,
+      path: relativePath
+    };
+  });
+
+  // Write m3u8 file
+  const m3u8Path = await writeM3U8(playlistName, m3u8Tracks, playlistsFolder);
+
+  console.log(`[SpotifyPlaylistDownloader] Playlist saved to: ${m3u8Path}`);
+
+  // Show success message for playlist creation
+  setSuccess(`Playlist created: ${playlistName} (${successfulTracks.length} tracks)`);
+
+  return {
+    m3u8Path,
+    stats: {
+      total: spotifyTracks.length,
+      queued: queuedCount,
+      skipped: skippedCount,
+      failed: failedCount
+    }
+  };
+}