Playlist with zero matches/unmatched error handling (#2052)

* Playlist with zero matches/unmatched error handling

* Reset playlist

* Rseet option in reloadSongs

* lint

src/commands/game_options/playlist.ts

@@ -624,6 +624,29 @@ export default class PlaylistCommand implements BaseCommand {
             });
         }
 
+        if (attachments.length === 0) {
+            logger.warn(
+                `Playlist ${kmqPlaylistIdentifier} unexpectedly empty in sendMatchedSongsFile. playlist = ${JSON.stringify(playlist)}`,
+            );
+
+            await sendErrorMessage(
+                messageContext,
+                {
+                    title: i18n.translate(
+                        guildID,
+                        "command.playlist.noMatches.title",
+                    ),
+                    description: i18n.translate(
+                        guildID,
+                        "command.playlist.noMatches.description",
+                    ),
+                },
+                interaction,
+            );
+
+            return;
+        }
+
         if (interaction.acknowledged) {
             await interaction.createFollowup({
                 attachments,

src/structures/song_selector.ts

@@ -12,8 +12,10 @@ import {
     setDifference,
     shufflePartitionedArray,
 } from "../helpers/utils";
+import { getDebugLogHeader } from "../helpers/discord_utils";
 import ArtistType from "../enums/option_types/artist_type";
 import EnvVariableManager from "../env_variable_manager";
+import GameOption from "../enums/game_option_name";
 import GameRound from "./game_round";
 import LanguageType from "../enums/option_types/language_type";
 import OstPreference from "../enums/option_types/ost_preference";
@@ -279,6 +281,12 @@ export default class SongSelector {
             this.guildPreference.gameOptions.forcePlaySongID
         ) {
             this.selectedSongs = await this.querySelectedSongs();
+            if (messageContext) {
+                logger.error(
+                    `${getDebugLogHeader(messageContext)} | Returning null matchedPlaylist for either non-playlist ${!kmqPlaylistIdentifier} or forceplay is active ${this.guildPreference.gameOptions.forcePlaySongID}`,
+                );
+            }
+
             return null;
         }
 
@@ -289,6 +297,17 @@ export default class SongSelector {
             interaction!,
         );
 
+        if (
+            playlist.unmatchedSongs.length === 0 &&
+            playlist.matchedSongs.length === 0
+        ) {
+            logger.warn(
+                `Playlist ${kmqPlaylistIdentifier} unexpectedly has 0 matched/unmatched songs in reloadSongs, resetting playlist. playlist = ${JSON.stringify(playlist)}`,
+            );
+
+            await this.guildPreference.reset(GameOption.PLAYLIST_ID);
+        }
+
         this.selectedSongs = playlist as SelectedSongs;
         return playlist;
     }