add pagination

app/src/main/java/musicbot/Main.java

@@ -17,5 +17,6 @@ public class Main {
     manager.add(new MusicVideo());
     manager.add(new Recommend());
     jda.addEventListener(manager);
+    jda.addEventListener(new Listeners());
   }
 }

app/src/main/java/musicbot/SpotifyClient.java

@@ -52,7 +52,7 @@ public class SpotifyClient {
 
   public List<Track> findTracks(final String query) {
     try {
-      final SearchTracksRequest searchTracksRequest = SPOTIFY_API.searchTracks(query).limit(10).build();
+      final SearchTracksRequest searchTracksRequest = SPOTIFY_API.searchTracks(query).build();
 
       final Paging<Track> tracks = searchTracksRequest.execute();
 
@@ -63,8 +63,7 @@ public class SpotifyClient {
   }
 
   public List<Track> findRecommendations(final String artistId, final String genres) {
-    final GetRecommendationsRequest.Builder recommendationsRequestBuilder = SPOTIFY_API.getRecommendations()
-        .limit(5);
+    final GetRecommendationsRequest.Builder recommendationsRequestBuilder = SPOTIFY_API.getRecommendations();
 
     if (!artistId.isEmpty()) {
       recommendationsRequestBuilder
@@ -80,7 +79,6 @@ public class SpotifyClient {
 
     try {
       final Recommendations recommendations = recommendationsRequest.execute();
-      System.out.println("Length: " + recommendations.getTracks().length);
 
       return Arrays.stream(recommendations.getTracks()).collect(Collectors.toList());
     } catch (IOException | SpotifyWebApiException | ParseException e) {

app/src/main/java/musicbot/YoutubeSearch.java

@@ -35,9 +35,6 @@ public class YoutubeSearch {
     final List<SearchResult> searchResults = doSearch(title, artist);
 
     final Optional<SearchResult> maybeResult = searchResults.stream().findFirst();
-    searchResults.stream().forEach(result -> {
-      System.out.println("result ID = " + result.getId());
-    });
 
     return maybeResult.map(result -> "http://www.youtube.com/watch?v=" + result.getId().getVideoId())
         .orElse("No videos found.");

app/src/main/java/musicbot/commands/Genres.java

@@ -8,6 +8,7 @@ import net.dv8tion.jda.api.entities.MessageEmbed;
 import net.dv8tion.jda.api.events.interaction.command.SlashCommandInteractionEvent;
 import net.dv8tion.jda.api.hooks.ListenerAdapter;
 import net.dv8tion.jda.api.interactions.commands.build.OptionData;
+import net.dv8tion.jda.api.interactions.components.buttons.Button;
 import org.jetbrains.annotations.NotNull;
 
 import java.util.ArrayList;
@@ -33,17 +34,16 @@ public class Genres implements MCommand {
 
   @Override
   public void execute(SlashCommandInteractionEvent event) {
+    event.deferReply().queue();
     final SpotifyClient spotifyClient = new SpotifyClient();
     final List<String> genres = spotifyClient.findGenres();
 
-    final List<List<String>> batches = Lists.partition(genres, 20);
+    final EmbedBuilder eb = new EmbedBuilder();
 
-    final List<MessageEmbed> embeds = batches.stream().map(genresList -> {
-      final EmbedBuilder eb = new EmbedBuilder();
-      genresList.forEach(genre -> eb.addField(genre, "", false));
-      return eb.build();
-    }).collect(Collectors.toList());
+    genres.subList(0, 10).forEach(genre -> eb.addField(genre, "", false));
 
-    event.getChannel().sendMessageEmbeds(embeds).queue();
+    event.getHook().sendMessageEmbeds(eb.build()).addActionRow(
+        Button.primary("genre_1", "More")
+    ).queue();
   }
 }

app/src/main/java/musicbot/commands/Recommend.java

@@ -1,7 +1,7 @@
 package musicbot.commands;
 
 import musicbot.MCommand;
-import musicbot.SpotifyClient;
+import musicbot.RecommendationService;
 import net.dv8tion.jda.api.EmbedBuilder;
 import net.dv8tion.jda.api.entities.MessageEmbed;
 import net.dv8tion.jda.api.events.interaction.command.SlashCommandInteractionEvent;
@@ -9,7 +9,6 @@ import net.dv8tion.jda.api.interactions.commands.OptionMapping;
 import net.dv8tion.jda.api.interactions.commands.OptionType;
 import net.dv8tion.jda.api.interactions.commands.build.OptionData;
 import net.dv8tion.jda.api.interactions.components.buttons.Button;
-import se.michaelthelin.spotify.model_objects.specification.Artist;
 import se.michaelthelin.spotify.model_objects.specification.ArtistSimplified;
 import se.michaelthelin.spotify.model_objects.specification.Track;
 
@@ -48,28 +47,21 @@ public class Recommend implements MCommand {
   public void execute(SlashCommandInteractionEvent event) {
     event.deferReply().queue();
 
-    final OptionMapping artistInput = event.getOption("artist");
-    final OptionMapping genreInput = event.getOption("genre");
+    final String artistInput = event.getOption("artist") != null ? event.getOption("artist").getAsString() : "";
+    final String genreInput = event.getOption("genre") != null ? event.getOption("genre").getAsString() : "";
 
-    final Optional<String> maybeArtistId = findArtistId(artistInput);
-    final Optional<String> maybeGenre = findGenre(genreInput);
-
-    final SpotifyClient spotifyClient = new SpotifyClient();
-
-    final String artistId = maybeArtistId.orElse("");
-    final String genre = maybeGenre.orElse("");
-    final List<Track> tracks = spotifyClient.findRecommendations(artistId, genre);
+    final List<Track> tracks = new RecommendationService().getRecommendations(artistInput, genreInput, 1);
 
     final EmbedBuilder eb = new EmbedBuilder();
-    if (!tracks.isEmpty()) {
-
+    final List<Track> trackList = tracks.subList(0, 5);
+    if (!trackList.isEmpty()) {
       eb
-          .setTitle("Recommendations")
+          .setTitle("Recommendations based on \"" + artistInput + "\"")
           .setDescription("Here are a list of recommendations based on your input. " +
               "It will help you find new music to listen to.")
           .setFooter("To find a song, select a button below.");
 
-      tracks.forEach(track -> {
+      trackList.forEach(track -> {
         final List<String> trackArtists = Arrays.stream(track.getArtists())
             .map(ArtistSimplified::getName)
             .collect(Collectors.toList());
@@ -80,10 +72,24 @@ public class Recommend implements MCommand {
 
       final MessageEmbed embed = eb.build();
 
-      final List<Button> buttons = tracks.stream().map(track ->
-          Button.primary(track.getName(), track.getName())).toList();
 
-      event.getHook().sendMessageEmbeds(embed).addActionRow(buttons).queue();
+      final List<Button> buttons = trackList.stream().map(track -> {
+            final String artists = String.join(
+                ", ",
+                Arrays.stream(track.getArtists()).map(ArtistSimplified::getName)
+                    .collect(Collectors.toList()));
+
+            return Button.primary("recommend_" + artists, track.getName());
+      }).collect(Collectors.toList());
+
+      final String buttonId = "more-recommend_" + artistInput + "--" + genreInput + "_" + "1";
+
+      event
+          .getHook()
+          .sendMessageEmbeds(embed)
+          .addActionRow(buttons)
+          .addActionRow(Button.secondary(buttonId, "Get more recommendations"))
+          .queue();
     } else {
       eb.setTitle("No recommendations found");
       final MessageEmbed embed = eb.build();
@@ -91,23 +97,4 @@ public class Recommend implements MCommand {
       event.getHook().sendMessageEmbeds(embed).queue();
     }
   }
-
-  private Optional<String> findArtistId(final OptionMapping artistInput) {
-    if (artistInput == null) {
-      return Optional.empty();
-    }
-
-    final SpotifyClient spotifyClient = new SpotifyClient();
-    final Optional<Artist> maybeArtist = spotifyClient.findArtist(artistInput.getAsString());
-
-    return maybeArtist.map(Artist::getId);
-  }
-
-  private Optional<String> findGenre(final OptionMapping genreInput) {
-    if (genreInput == null) {
-      return Optional.empty();
-    }
-
-    return Optional.of(genreInput.getAsString());
-  }
 }