Merge dev into master: Spotify 자동재생 폴백

bot/src/classes/GuildPlayer.ts

@@ -275,12 +275,45 @@ export class GuildPlayer {
     if (!this.lastPlayedTrack) return;
     const source = this.lastPlayedTrack.info.sourceName;
     const trackId = this.lastPlayedTrack.info.identifier;
+    const title = this.lastPlayedTrack.info.title;
+    const author = this.lastPlayedTrack.info.author;
     let result;
+    let usedYtFallback = false;
+
     if (source === "spotify") {
-      result = await this.player.node.rest.resolve(`sprec:seed_tracks=${trackId}&limit=11`);
+      const sprecUri = `sprec:seed_tracks=${trackId}&limit=11`;
+      try {
+        result = await this.player.node.rest.resolve(sprecUri);
+        Logger.info(`[autoPlay] sprec loadType=${result?.loadType ?? "(null)"} for "${author} - ${title}"`);
+      } catch (err) {
+        Logger.warn(`[autoPlay] sprec resolve throw: ${String(err)}`);
+        result = undefined;
+      }
+      // 2024-11-27 이후 신규/development 모드 앱은 Spotify Recommendations API 접근이 막혀서
+      // sprec이 EMPTY로 떨어지는 경우가 있음. extended 모드 토큰이면 동작함.
+      // 결과 없으면 YouTube로 폴백.
+      if (!result
+        || result.loadType === LoadType.EMPTY
+        || result.loadType === LoadType.ERROR
+        || (result.loadType === LoadType.PLAYLIST && result.data.tracks.length === 0)
+      ) {
+        if (result?.loadType === LoadType.ERROR) {
+          Logger.warn(`[autoPlay] sprec ERROR: ${result.data?.message ?? "unknown"}. YouTube으로 폴백합니다.`);
+        } else {
+          Logger.warn(`[autoPlay] sprec 결과 없음. YouTube으로 폴백합니다.`);
+        }
+        result = await this.youtubeMixFromSpotifyTrack(author, title);
+        usedYtFallback = true;
+      }
     } else {
-      result = await this.player.node.rest.resolve(`https://music.youtube.com/watch?v=${trackId}&list=RD${trackId}`);
+      try {
+        result = await this.player.node.rest.resolve(`https://music.youtube.com/watch?v=${trackId}&list=RD${trackId}`);
+      } catch (err) {
+        Logger.warn(`[autoPlay] YouTube mix resolve throw: ${String(err)}`);
+        result = undefined;
+      }
     }
+
     let tracks: Track[] = [];
     if (result?.loadType === LoadType.PLAYLIST) {
       tracks = result.data.tracks;
@@ -289,6 +322,7 @@ export class GuildPlayer {
     } else if (result?.loadType === LoadType.TRACK) {
       tracks = [ result.data ];
     }
+    Logger.info(`[autoPlay] 자동재생 후보 ${tracks.length}곡${usedYtFallback ? " (YouTube 폴백)" : ""}`);
     if (tracks.length === 0) {
       this.end();
       return;
@@ -301,6 +335,39 @@ export class GuildPlayer {
     this.addTracks(tracks, "자동재생");
   }
 
+  /**
+   * Spotify 트랙 메타데이터로 YouTube 검색 후 매칭된 곡의 RD 믹스를 가져옴.
+   * (현재 Lavalink에서 `ytmsearch:`는 EMPTY를 자주 반환하므로 `ytsearch:` 사용)
+   * 각 단계가 실패하면 다음 단계로 진행하지 않고 undefined 반환.
+   */
+  private async youtubeMixFromSpotifyTrack(author: string, title: string) {
+    const cleanAuthor = author.replace(" - Topic", "");
+    const query = `ytsearch:${cleanAuthor} ${title}`;
+    let searchResult;
+    try {
+      searchResult = await this.player.node.rest.resolve(query);
+    } catch (err) {
+      Logger.warn(`[autoPlay] YouTube 폴백 검색 throw: ${String(err)}`);
+      return undefined;
+    }
+    if (
+      searchResult?.loadType !== LoadType.SEARCH
+      || !Array.isArray(searchResult.data)
+      || searchResult.data.length === 0
+    ) {
+      Logger.warn(`[autoPlay] YouTube 폴백 검색 결과 없음 (query="${cleanAuthor} ${title}", loadType=${searchResult?.loadType ?? "(null)"})`);
+      return undefined;
+    }
+    const ytId = searchResult.data[0].info.identifier;
+    Logger.info(`[autoPlay] YouTube 폴백 매칭: videoId=${ytId}`);
+    try {
+      return await this.player.node.rest.resolve(`https://music.youtube.com/watch?v=${ytId}&list=RD${ytId}`);
+    } catch (err) {
+      Logger.warn(`[autoPlay] YouTube 폴백 RD 믹스 resolve throw: ${String(err)}`);
+      return undefined;
+    }
+  }
+
   private clearAllTimers() {
     if (this.errorTimer !== undefined) {
       clearTimeout(this.errorTimer);