Implement magic ball message command

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

@@ -135,6 +135,7 @@ public class HidekoBot
         messageCommandListener.registerCommand(new wtf.beatrice.hidekobot.commands.message.ClearCommand());
         messageCommandListener.registerCommand(new wtf.beatrice.hidekobot.commands.message.DiceRollCommand());
         messageCommandListener.registerCommand(new wtf.beatrice.hidekobot.commands.message.InviteCommand());
+        messageCommandListener.registerCommand(new wtf.beatrice.hidekobot.commands.message.MagicBallCommand());
         messageCommandListener.registerCommand(new wtf.beatrice.hidekobot.commands.message.SayCommand());
         Cache.setMessageCommandListener(messageCommandListener);
 

src/main/java/wtf/beatrice/hidekobot/commands/message/MagicBallCommand.java

@@ -0,0 +1,92 @@
+package wtf.beatrice.hidekobot.commands.message;
+
+import net.dv8tion.jda.api.EmbedBuilder;
+import net.dv8tion.jda.api.Permission;
+import net.dv8tion.jda.api.events.message.MessageReceivedEvent;
+import org.jetbrains.annotations.Nullable;
+import wtf.beatrice.hidekobot.Cache;
+import wtf.beatrice.hidekobot.objects.commands.MessageCommand;
+import wtf.beatrice.hidekobot.util.RandomUtil;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.LinkedList;
+import java.util.List;
+
+public class MagicBallCommand implements MessageCommand
+{
+    private final List<String> answers = new ArrayList<>(
+            Arrays.asList("It is certain.",
+            "It is decidedly so.",
+            "Without a doubt.",
+            "Yes definitely.",
+            "You may rely on it.",
+            "As I see it, yes.",
+            "Most likely.",
+            "Outlook good.",
+            "Yes.",
+            "Signs point to yes.",
+            "Reply hazy, try again.",
+            "Ask again later.",
+            "Better not tell you now.",
+            "Cannot predict now.",
+            "Concentrate and ask again.",
+            "Don't count on it.",
+            "My reply is no.",
+            "My sources say no.",
+            "Outlook not so good.",
+            "Very doubtful."));
+
+    @Override
+    public LinkedList<String> getCommandLabels() {
+        return new LinkedList<>(Arrays.asList("8ball", "eightball", "magicball", "8b"));
+    }
+
+    @Nullable
+    @Override
+    public List<Permission> getPermissions() {
+        return null; // anyone can use it
+    }
+
+    @Override
+    public boolean passRawArgs() {
+        return false;
+    }
+
+    @Override
+    public void runCommand(MessageReceivedEvent event, String label, String[] args)
+    {
+        if(args.length == 0)
+        {
+            event.getMessage().reply("You need to specify a question!").queue();
+            return;
+        }
+
+        StringBuilder questionBuilder = new StringBuilder();
+        for(int i = 0; i < args.length; i++)
+        {
+            String arg = args[i];
+            questionBuilder.append(arg);
+            if(i + 1 != args.length) // don't add a separator on the last iteration
+                questionBuilder.append(" ");
+        }
+
+       String question = questionBuilder.toString();
+
+        // add a question mark at the end, if missing.
+        // this might not always apply but it's fun
+        if(!question.endsWith("?")) question += "?";
+
+       int answerPos = RandomUtil.getRandomNumber(0, answers.size() - 1);
+       String answer = answers.get(answerPos);
+
+        EmbedBuilder embedBuilder = new EmbedBuilder();
+        embedBuilder.setAuthor(event.getAuthor().getAsTag(), null, event.getAuthor().getAvatarUrl());
+        embedBuilder.setTitle("Magic Ball");
+        embedBuilder.setColor(Cache.getBotColor());
+        embedBuilder.addField("❓ Question", question, false);
+        embedBuilder.addField("\uD83C\uDFB1 Answer", answer, false);
+
+        event.getMessage().replyEmbeds(embedBuilder.build()).queue();
+    }
+}