Auto create threads for suggestions (#469)

* Auto create threads for suggestions

* added a condition to general checks

* made a method for thread creation

* added notnull annotation to message argument in createThread method

* removed unnecessary checks

* changed algorithm to generate thread titles

* removed unnecessary variable

Author: Taz03

application/src/main/java/org/togetherjava/tjbot/commands/basic/SuggestionsUpDownVoter.java

@@ -22,6 +22,7 @@
  */
 public final class SuggestionsUpDownVoter extends MessageReceiverAdapter {
     private static final Logger logger = LoggerFactory.getLogger(SuggestionsUpDownVoter.class);
+    private static final int TITLE_MAX_LENGTH = 60;
     private static final String FALLBACK_UP_VOTE = "👍";
     private static final String FALLBACK_DOWN_VOTE = "👎";
 
@@ -47,10 +48,27 @@ public void onMessageReceived(@NotNull MessageReceivedEvent event) {
         Guild guild = event.getGuild();
         Message message = event.getMessage();
 
+        createThread(message);
         reactWith(config.getUpVoteEmoteName(), FALLBACK_UP_VOTE, guild, message);
         reactWith(config.getDownVoteEmoteName(), FALLBACK_DOWN_VOTE, guild, message);
     }
 
+    private static void createThread(@NotNull Message message) {
+        String title = message.getContentRaw();
+
+        if (title.length() >= TITLE_MAX_LENGTH) {
+            int lastWordEnd = title.lastIndexOf(' ', TITLE_MAX_LENGTH);
+
+            if (lastWordEnd == -1) {
+                lastWordEnd = TITLE_MAX_LENGTH;
+            }
+
+            title = title.substring(0, lastWordEnd);
+        }
+
+        message.createThreadChannel(title).queue();
+    }
+
     private static void reactWith(@NotNull String emoteName, @NotNull String fallbackUnicodeEmote,
             @NotNull Guild guild, @NotNull Message message) {
         getEmoteByName(emoteName, guild).map(message::addReaction).orElseGet(() -> {