Make magicball support slash commands too

src/main/java/wtf/beatrice/hidekobot/commands/base/MagicBall.java

@@ -0,0 +1,67 @@
+package wtf.beatrice.hidekobot.commands.base;
+
+import net.dv8tion.jda.api.EmbedBuilder;
+import net.dv8tion.jda.api.entities.MessageEmbed;
+import net.dv8tion.jda.api.entities.User;
+import wtf.beatrice.hidekobot.Cache;
+import wtf.beatrice.hidekobot.util.RandomUtil;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.LinkedList;
+import java.util.List;
+
+public class MagicBall
+{
+
+    public static LinkedList<String> getLabels()
+    {
+        return new LinkedList<>(Arrays.asList("8ball", "eightball", "magicball", "8b"));
+    }
+
+    private final static 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.",
+                    "Looks like it.",
+                    "Yes.",
+                    "Signs point to yes.",
+                    "Reply hazy, try again.",
+                    "Ask again later.",
+                    "Better not tell you now.",
+                    "Seems uncertain.",
+                    "Concentrate and ask again.",
+                    "Don't count on it.",
+                    "My answer is no.",
+                    "My sources say no.",
+                    "Outlook not so good.",
+                    "Very doubtful."));
+
+    public static String getRandomAnswer()
+    {
+        int answerPos = RandomUtil.getRandomNumber(0, answers.size() - 1);
+        return answers.get(answerPos);
+    }
+
+    public static MessageEmbed generateEmbed(String question, User author)
+    {
+        // add a question mark at the end, if missing.
+        // this might not always apply but it's fun
+        if(!question.endsWith("?")) question += "?";
+
+        String answer = getRandomAnswer();
+
+        EmbedBuilder embedBuilder = new EmbedBuilder();
+        embedBuilder.setAuthor(author.getAsTag(), null, author.getAvatarUrl());
+        embedBuilder.setTitle("Magic Ball");
+        embedBuilder.setColor(Cache.getBotColor());
+        embedBuilder.addField("❓ Question", question, false);
+        embedBuilder.addField("\uD83C\uDFB1 Answer", answer, false);
+
+        return embedBuilder.build();
+    }
+}