Implement profile banner grabber command

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

@@ -0,0 +1,39 @@
+package wtf.beatrice.hidekobot.commands.completer;
+
+import net.dv8tion.jda.api.events.interaction.command.CommandAutoCompleteInteractionEvent;
+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 ProfileImageCommandCompleter extends SlashArgumentsCompleterImpl
+{
+
+    public ProfileImageCommandCompleter(SlashCommand parentCommand) {
+        super(parentCommand);
+    }
+
+    @Override
+    public void runCompletion(@NotNull CommandAutoCompleteInteractionEvent event) {
+        if(event.getFocusedOption().getName().equals("size"))
+        {
+
+            List<Command.Choice> options = new ArrayList<>();
+
+            for(int res : Cache.getSupportedAvatarResolutions())
+            {
+                String resString = String.valueOf(res);
+                String userInput = event.getFocusedOption().getValue();
+
+                if(resString.startsWith(userInput))
+                    options.add(new Command.Choice(resString, res));
+            }
+
+            event.replyChoices(options).queue();
+        }
+    }
+}