Finish command completion listener implementation

Very similarly to how the slash command interface works, now a slash command auto-completion interface also exists, with its respective listener.

src/main/java/wtf/beatrice/hidekobot/Cache.java

@@ -7,6 +7,7 @@ import wtf.beatrice.hidekobot.datasources.DatabaseSource;
 import wtf.beatrice.hidekobot.datasources.PropertiesSource;
 import wtf.beatrice.hidekobot.listeners.MessageCommandListener;
 import wtf.beatrice.hidekobot.listeners.MessageLogger;
+import wtf.beatrice.hidekobot.listeners.SlashCommandCompletionListener;
 import wtf.beatrice.hidekobot.listeners.SlashCommandListener;
 import wtf.beatrice.hidekobot.util.Logger;
 
@@ -40,6 +41,7 @@ public class Cache
     private static final String botName = "Hideko";
 
     private static SlashCommandListener slashCommandListener = null;
+    private static SlashCommandCompletionListener slashCommandCompletionListener = null;
     private static MessageCommandListener messageCommandListener = null;
 
     private final static String defaultInviteLink =
@@ -226,6 +228,12 @@ public class Cache
     public static SlashCommandListener getSlashCommandListener() { return slashCommandListener; }
 
 
+    public static void setSlashCommandCompletionListener(SlashCommandCompletionListener commandCompletionListener)
+    { slashCommandCompletionListener = commandCompletionListener; }
+
+    public static SlashCommandCompletionListener getSlashCommandCompletionListener() { return slashCommandCompletionListener; }
+
+
     public static void setMessageCommandListener(MessageCommandListener commandListener)
     { messageCommandListener = commandListener; }
 

src/main/java/wtf/beatrice/hidekobot/HidekoBot.java

@@ -6,6 +6,7 @@ import net.dv8tion.jda.api.OnlineStatus;
 import net.dv8tion.jda.api.entities.Activity;
 import net.dv8tion.jda.api.requests.GatewayIntent;
 import sun.misc.Signal;
+import wtf.beatrice.hidekobot.commands.completer.AvatarCommandCompleter;
 import wtf.beatrice.hidekobot.commands.message.HelloCommand;
 import wtf.beatrice.hidekobot.commands.slash.*;
 import wtf.beatrice.hidekobot.datasources.ConfigurationSource;
@@ -13,7 +14,7 @@ import wtf.beatrice.hidekobot.datasources.DatabaseSource;
 import wtf.beatrice.hidekobot.datasources.PropertiesSource;
 import wtf.beatrice.hidekobot.listeners.ButtonInteractionListener;
 import wtf.beatrice.hidekobot.listeners.MessageCommandListener;
-import wtf.beatrice.hidekobot.listeners.SlashCommandCompleter;
+import wtf.beatrice.hidekobot.listeners.SlashCommandCompletionListener;
 import wtf.beatrice.hidekobot.listeners.SlashCommandListener;
 import wtf.beatrice.hidekobot.runnables.ExpiredMessageTask;
 import wtf.beatrice.hidekobot.runnables.HeartBeatTask;
@@ -107,9 +108,13 @@ public class HidekoBot
 
         }
 
-        // register slash commands
+        // register slash commands and completers
         SlashCommandListener slashCommandListener = new SlashCommandListener();
-        slashCommandListener.registerCommand(new AvatarCommand());
+        SlashCommandCompletionListener slashCommandCompletionListener = new SlashCommandCompletionListener();
+        AvatarCommand avatarCommand = new AvatarCommand();
+        AvatarCommandCompleter avatarCommandCompleter = new AvatarCommandCompleter(avatarCommand);
+        slashCommandListener.registerCommand(avatarCommand);
+        slashCommandCompletionListener.registerCommandCompleter(avatarCommandCompleter);
         slashCommandListener.registerCommand(new BotInfoCommand());
         slashCommandListener.registerCommand(new ClearCommand());
         slashCommandListener.registerCommand(new CoinFlipCommand());
@@ -119,6 +124,7 @@ public class HidekoBot
         slashCommandListener.registerCommand(new PingCommand());
         slashCommandListener.registerCommand(new SayCommand());
         Cache.setSlashCommandListener(slashCommandListener);
+        Cache.setSlashCommandCompletionListener(slashCommandCompletionListener);
 
         // register message commands
         MessageCommandListener messageCommandListener = new MessageCommandListener();
@@ -132,7 +138,7 @@ public class HidekoBot
         // register listeners
         jda.addEventListener(messageCommandListener);
         jda.addEventListener(slashCommandListener);
-        jda.addEventListener(new SlashCommandCompleter());
+        jda.addEventListener(slashCommandCompletionListener);
         jda.addEventListener(new ButtonInteractionListener());
 
         // update slash commands (delayed)

src/main/java/wtf/beatrice/hidekobot/commands/completer/AvatarCommandCompleter.java

@@ -4,15 +4,21 @@ import net.dv8tion.jda.api.events.interaction.command.CommandAutoCompleteInterac
 import net.dv8tion.jda.api.interactions.commands.Command;
 import org.jetbrains.annotations.NotNull;
 import wtf.beatrice.hidekobot.Cache;
+import wtf.beatrice.hidekobot.objects.commands.SlashArgumentsCompleterImpl;
+import wtf.beatrice.hidekobot.objects.commands.SlashCommand;
 
 import java.util.ArrayList;
 import java.util.List;
 
-public class AvatarCompleter
+public class AvatarCommandCompleter extends SlashArgumentsCompleterImpl
 {
 
-    public AvatarCompleter(@NotNull CommandAutoCompleteInteractionEvent event)
-    {
+    public AvatarCommandCompleter(SlashCommand parentCommand) {
+        super(parentCommand);
+    }
+
+    @Override
+    public void runCompletion(@NotNull CommandAutoCompleteInteractionEvent event) {
         if(event.getFocusedOption().getName().equals("size"))
         {
 

src/main/java/wtf/beatrice/hidekobot/listeners/SlashCommandCompleter.java

@@ -1,17 +0,0 @@
-package wtf.beatrice.hidekobot.listeners;
-
-import net.dv8tion.jda.api.events.interaction.command.CommandAutoCompleteInteractionEvent;
-import net.dv8tion.jda.api.hooks.ListenerAdapter;
-import wtf.beatrice.hidekobot.commands.completer.AvatarCompleter;
-
-public class SlashCommandCompleter extends ListenerAdapter
-{
-
-    @Override
-    public void onCommandAutoCompleteInteraction(CommandAutoCompleteInteractionEvent event)
-    {
-        switch (event.getName().toLowerCase()) {
-            case "avatar" -> new AvatarCompleter(event);
-        }
-    }
-}

src/main/java/wtf/beatrice/hidekobot/listeners/SlashCommandCompletionListener.java

@@ -0,0 +1,38 @@
+package wtf.beatrice.hidekobot.listeners;
+
+import net.dv8tion.jda.api.events.interaction.command.CommandAutoCompleteInteractionEvent;
+import net.dv8tion.jda.api.hooks.ListenerAdapter;
+import wtf.beatrice.hidekobot.objects.commands.SlashArgumentsCompleter;
+
+import java.util.LinkedList;
+import java.util.TreeMap;
+
+public class SlashCommandCompletionListener extends ListenerAdapter
+{
+
+    // map that stores command label and command auto-completer alphabetically.
+    private final TreeMap<String, SlashArgumentsCompleter> registeredCompleters = new TreeMap<>();
+
+    public void registerCommandCompleter(SlashArgumentsCompleter completer)
+    {
+        String parentCommandName = completer.getCommand().getCommandName();
+        registeredCompleters.remove(parentCommandName);
+        registeredCompleters.put(parentCommandName, completer);
+    }
+
+    public SlashArgumentsCompleter getRegisteredCompleter(String label)
+    { return registeredCompleters.get(label); }
+
+    public LinkedList<SlashArgumentsCompleter> getRegisteredCompleters()
+    { return new LinkedList<>(registeredCompleters.values()); }
+    @Override
+    public void onCommandAutoCompleteInteraction(CommandAutoCompleteInteractionEvent event)
+    {
+        String commandName = event.getName().toLowerCase();
+        SlashArgumentsCompleter completer = registeredCompleters.get(commandName);
+        if(completer == null) return;
+
+        // not running in a thread because nothing heavy should be done here...
+        completer.runCompletion(event);
+    }
+}

src/main/java/wtf/beatrice/hidekobot/listeners/SlashCommandListener.java

@@ -11,7 +11,7 @@ import java.util.TreeMap;
 public class SlashCommandListener extends ListenerAdapter
 {
 
-    // map storing command label and command object alphabetically.
+    // map that stores command label and command object alphabetically.
     private final TreeMap<String, SlashCommand> registeredCommands = new TreeMap<>();
 
     public void registerCommand(SlashCommand command)

src/main/java/wtf/beatrice/hidekobot/objects/commands/SlashArgumentsCompleter.java

@@ -0,0 +1,21 @@
+package wtf.beatrice.hidekobot.objects.commands;
+
+import net.dv8tion.jda.api.events.interaction.command.CommandAutoCompleteInteractionEvent;
+import org.jetbrains.annotations.NotNull;
+
+public interface SlashArgumentsCompleter
+{
+
+    /**
+     * Get the parent slash command's object.
+     *
+     * @return the command object.
+     */
+    SlashCommand getCommand();
+    /**
+     * Run the argument-completion logic by parsing the event and replying accordingly.
+     *
+     * @param event the received auto-complete event.
+     */
+    void runCompletion(@NotNull CommandAutoCompleteInteractionEvent event);
+}

src/main/java/wtf/beatrice/hidekobot/objects/commands/SlashArgumentsCompleterImpl.java

@@ -0,0 +1,21 @@
+package wtf.beatrice.hidekobot.objects.commands;
+
+import net.dv8tion.jda.api.events.interaction.command.CommandAutoCompleteInteractionEvent;
+import org.jetbrains.annotations.NotNull;
+
+public class SlashArgumentsCompleterImpl implements SlashArgumentsCompleter
+{
+    private final SlashCommand parentCommand;
+    public SlashArgumentsCompleterImpl(SlashCommand parentCommand)
+    {
+        this.parentCommand = parentCommand;
+    }
+
+    public SlashCommand getCommand()
+    { return parentCommand; }
+
+    public void runCompletion(@NotNull CommandAutoCompleteInteractionEvent event)
+    {
+        return;
+    }
+}