Increase randomness by updating the random's seed every minute

This is useless but looks better

pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>wtf.beatrice.hidekobot</groupId>
     <artifactId>HidekoBot</artifactId>
-    <version>0.5.0</version>
+    <version>0.5.11</version>
 
     <properties>
         <maven.compiler.source>16</maven.compiler.source>
@@ -18,7 +18,7 @@
         <dependency>
             <groupId>net.dv8tion</groupId>
             <artifactId>JDA</artifactId>
-            <version>5.0.0-alpha.22</version>
+            <version>5.0.0-beta.2</version>
         </dependency>
         <dependency>
             <groupId>org.slf4j</groupId>
@@ -40,6 +40,21 @@
             <artifactId>snakeyaml</artifactId>
             <version>1.33</version>
         </dependency>
+        <dependency>
+            <groupId>org.jsoup</groupId>
+            <artifactId>jsoup</artifactId>
+            <version>1.15.3</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-text</artifactId>
+            <version>1.10.0</version>
+        </dependency>
+        <dependency>
+            <groupId>com.vdurmont</groupId>
+            <artifactId>emoji-java</artifactId>
+            <version>5.1.1</version>
+        </dependency>
     </dependencies>
 
 

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

@@ -14,6 +14,7 @@ import wtf.beatrice.hidekobot.util.Logger;
 import java.awt.*;
 import java.lang.reflect.Field;
 import java.time.LocalDateTime;
+import java.util.Random;
 
 public class Cache
 {
@@ -23,6 +24,10 @@ public class Cache
     private static final String botPrefix = "hideko";
     private static final Logger logger = new Logger(Cache.class);
 
+    // the Random instance that we should always use when looking for an RNG based thing.
+    // the seed is updated periodically.
+    private static final Random randomInstance = new Random();
+
     private static PropertiesSource propertiesSource = null;
     private static ConfigurationSource configurationSource = null;
     private static DatabaseSource databaseSource = null;
@@ -60,6 +65,14 @@ public class Cache
      */
     public static int[] getSupportedAvatarResolutions() { return supportedAvatarResolutions; }
 
+    public static Random getRandom() {
+        return randomInstance;
+    }
+
+    public static void setRandomSeed(long seed) {
+        randomInstance.setSeed(seed);
+    }
+
     /**
      * Checks if the bot has been started with the verbose argument.
      *

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

@@ -18,8 +18,10 @@ import wtf.beatrice.hidekobot.listeners.SlashCommandCompletionListener;
 import wtf.beatrice.hidekobot.listeners.SlashCommandListener;
 import wtf.beatrice.hidekobot.runnables.ExpiredMessageTask;
 import wtf.beatrice.hidekobot.runnables.HeartBeatTask;
+import wtf.beatrice.hidekobot.runnables.RandomSeedTask;
+import wtf.beatrice.hidekobot.runnables.StatusUpdateTask;
+import wtf.beatrice.hidekobot.util.CommandUtil;
 import wtf.beatrice.hidekobot.util.Logger;
-import wtf.beatrice.hidekobot.util.SlashCommandUtil;
 
 import java.io.File;
 import java.time.LocalDateTime;
@@ -121,18 +123,28 @@ public class HidekoBot
         slashCommandListener.registerCommand(new DieCommand());
         slashCommandListener.registerCommand(new HelpCommand());
         slashCommandListener.registerCommand(new InviteCommand());
+        slashCommandListener.registerCommand(new MagicBallCommand());
         slashCommandListener.registerCommand(new PingCommand());
         slashCommandListener.registerCommand(new SayCommand());
+        slashCommandListener.registerCommand(new UrbanDictionaryCommand());
         Cache.setSlashCommandListener(slashCommandListener);
         Cache.setSlashCommandCompletionListener(slashCommandCompletionListener);
 
         // register message commands
         MessageCommandListener messageCommandListener = new MessageCommandListener();
         messageCommandListener.registerCommand(new HelloCommand());
-        messageCommandListener.registerCommand(new wtf.beatrice.hidekobot.commands.message.InviteCommand());
+        messageCommandListener.registerCommand(new wtf.beatrice.hidekobot.commands.message.AliasCommand());
+        messageCommandListener.registerCommand(new wtf.beatrice.hidekobot.commands.message.AvatarCommand());
         messageCommandListener.registerCommand(new wtf.beatrice.hidekobot.commands.message.BotInfoCommand());
         messageCommandListener.registerCommand(new wtf.beatrice.hidekobot.commands.message.CoinFlipCommand());
         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.HelpCommand());
+        messageCommandListener.registerCommand(new wtf.beatrice.hidekobot.commands.message.InviteCommand());
+        messageCommandListener.registerCommand(new wtf.beatrice.hidekobot.commands.message.LoveCalculatorCommand());
+        messageCommandListener.registerCommand(new wtf.beatrice.hidekobot.commands.message.MagicBallCommand());
+        messageCommandListener.registerCommand(new wtf.beatrice.hidekobot.commands.message.SayCommand());
+        messageCommandListener.registerCommand(new wtf.beatrice.hidekobot.commands.message.UrbanDictionaryCommand());
         Cache.setMessageCommandListener(messageCommandListener);
 
         // register listeners
@@ -144,11 +156,10 @@ public class HidekoBot
         // update slash commands (delayed)
         final boolean finalForceUpdateCommands = forceUpdateCommands;
         Executors.newSingleThreadScheduledExecutor().schedule(() -> // todo: try-with-resources
-                SlashCommandUtil.updateSlashCommands(finalForceUpdateCommands), 1, TimeUnit.SECONDS);
+                CommandUtil.updateSlashCommands(finalForceUpdateCommands), 1, TimeUnit.SECONDS);
 
         // set the bot's status
         jda.getPresence().setStatus(OnlineStatus.ONLINE);
-        jda.getPresence().setActivity(Activity.playing("Hatsune Miku: Project DIVA"));
 
         // connect to database
         logger.log("Connecting to database...");
@@ -172,6 +183,10 @@ public class HidekoBot
         scheduler.scheduleAtFixedRate(expiredMessageTask, 5, 5, TimeUnit.SECONDS); //every 5 seconds
         HeartBeatTask heartBeatTask = new HeartBeatTask();
         scheduler.scheduleAtFixedRate(heartBeatTask, 10, 30, TimeUnit.SECONDS); //every 30 seconds
+        StatusUpdateTask statusUpdateTask = new StatusUpdateTask();
+        scheduler.scheduleAtFixedRate(statusUpdateTask, 0, 60 * 5, TimeUnit.SECONDS); // every 5 minutes
+        RandomSeedTask randomSeedTask = new RandomSeedTask();
+        scheduler.scheduleAtFixedRate(randomSeedTask, 0, 60, TimeUnit.SECONDS); // every minute
 
         // register shutdown interrupt signal listener for proper shutdown.
         Signal.handle(new Signal("INT"), signal -> shutdown());

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

@@ -0,0 +1,23 @@
+package wtf.beatrice.hidekobot.commands.base;
+
+import wtf.beatrice.hidekobot.objects.commands.MessageCommand;
+
+import java.util.LinkedList;
+
+public class Alias
+{
+    public static String generateNiceAliases(MessageCommand command)
+    {
+        LinkedList<String> aliases = command.getCommandLabels();
+        StringBuilder aliasesStringBuilder = new StringBuilder();
+        for(int i = 0; i < aliases.size(); i++)
+        {
+            aliasesStringBuilder.append("`").append(aliases.get(i)).append("`");
+
+            if(i + 1 != aliases.size())
+                aliasesStringBuilder.append(", "); // separate with comma except on last iteration
+        }
+
+        return aliasesStringBuilder.toString();
+    }
+}

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

@@ -0,0 +1,62 @@
+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;
+
+public class Avatar
+{
+    public static int parseResolution(int resolution)
+    {
+        int[] acceptedSizes = Cache.getSupportedAvatarResolutions();
+
+        // method to find closest value to accepted values
+        int distance = Math.abs(acceptedSizes[0] - resolution);
+        int idx = 0;
+        for(int c = 1; c < acceptedSizes.length; c++){
+            int cdistance = Math.abs(acceptedSizes[c] - resolution);
+            if(cdistance < distance){
+                idx = c;
+                distance = cdistance;
+            }
+        }
+
+        return acceptedSizes[idx];
+    }
+
+    public static MessageEmbed buildEmbed(int resolution, User user)
+    {
+        int[] acceptedSizes = Cache.getSupportedAvatarResolutions();
+        EmbedBuilder embedBuilder = new EmbedBuilder();
+
+        embedBuilder.setColor(Cache.getBotColor());
+        embedBuilder.setTitle("Profile picture");
+
+        embedBuilder.addField("User", "<@" + user.getId() + ">", false);
+
+        embedBuilder.addField("Current resolution", resolution + " × " + resolution, false);
+
+        // string builder to create a string that links to all available resolutions
+        StringBuilder links = new StringBuilder();
+        for(int pos = 0; pos < acceptedSizes.length; pos++)
+        {
+            int currSize = acceptedSizes[pos];
+
+            String currLink = user.getEffectiveAvatar().getUrl(currSize);
+
+            links.append("[").append(currSize).append("px](").append(currLink).append(")");
+            if(pos + 1 != acceptedSizes.length) // don't add a separator on the last iteration
+            {
+                links.append(" | ");
+            }
+        }
+
+        embedBuilder.addField("Available resolutions", links.toString(), false);
+
+
+
+        embedBuilder.setImage(user.getEffectiveAvatar().getUrl(resolution));
+        return embedBuilder.build();
+    }
+}

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

@@ -7,10 +7,8 @@ import net.dv8tion.jda.api.entities.channel.Channel;
 import net.dv8tion.jda.api.entities.channel.concrete.TextChannel;
 import net.dv8tion.jda.api.entities.channel.middleman.MessageChannel;
 import net.dv8tion.jda.api.entities.emoji.Emoji;
-import net.dv8tion.jda.api.events.interaction.component.ButtonInteractionEvent;
 import net.dv8tion.jda.api.interactions.InteractionHook;
 import net.dv8tion.jda.api.interactions.components.buttons.Button;
-import wtf.beatrice.hidekobot.Cache;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -46,12 +44,15 @@ public class ClearChat
         return null;
     }
 
-    public static int delete(int toDeleteAmount, long startingMessageId, MessageChannel channel)
+    public static int delete(int toDeleteAmount,
+                             long startingMessageId,
+                             MessageChannel channel)
     {
         // int to keep track of how many messages we actually deleted.
         int deleted = 0;
 
-        int limit = 95; //discord limits this method to range 2-100. we set it to 95 to be safe.
+        int limit = 95; //discord limits this method to only 2<x<100 deletions per run.
+        // we set this slightly lower to be safe, and iterate as needed.
 
         // increase the count by 1, because we technically aren't clearing the first ID ever
         // which is actually the slash command's ID and not a message.
@@ -149,12 +150,13 @@ public class ClearChat
 
     public static Button getDismissButton()
     {
-        return Button.primary("clear_dismiss", "Dismiss")
+        return Button.primary("generic_dismiss", "Dismiss")
                 .withEmoji(Emoji.fromUnicode("❌"));
     }
 
     public static String parseAmount(int deleted)
     {
+
         if(deleted < 1)
         {
             return "\uD83D\uDE22 Couldn't clear any message!";
@@ -166,27 +168,7 @@ public class ClearChat
         }
     }
 
-    private void respond(Object responseFlowObj, String content)
-    {
-        if(responseFlowObj instanceof InteractionHook) {
-            ((InteractionHook) responseFlowObj).editOriginal(content).queue();
-        } else if (responseFlowObj instanceof Message) {
-            ((Message) responseFlowObj).reply(content).queue();
-        }
-    }
-
-
-
-    public static void dismissMessage(ButtonInteractionEvent event)
-    {
-
-        if(!(Cache.getDatabaseSource().isUserTrackedFor(event.getUser().getId(), event.getMessageId())))
-        {
-            event.reply("❌ You did not run this command!").setEphemeral(true).queue();
-        } else
-        {
-            event.getInteraction().getMessage().delete().queue();
-        }
-    }
+    // cap the amount to avoid abuse.
+    public static int getMaxAmount() { return 1000; }
 
 }

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

@@ -17,7 +17,7 @@ public class CoinFlip
 
     public static Button getReflipButton() {
         return Button.primary("coinflip_reflip", "Flip again")
-                .withEmoji(Emoji.fromFormatted("\uD83E\uDE99"));
+                .withEmoji(Emoji.fromUnicode("\uD83E\uDE99"));
     }
 
     public static String genRandom()
@@ -61,8 +61,6 @@ public class CoinFlip
 
     public static void trackAndRestrict(Message replyMessage, User user)
     {
-        String replyMessageId = replyMessage.getId();
-
         Cache.getDatabaseSource().queueDisabling(replyMessage);
         Cache.getDatabaseSource().trackRanCommandReply(replyMessage, user);
     }

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", "8b", "eightball", "magicball"));
+    }
+
+    private final static List<String> answers = new ArrayList<>(
+            Arrays.asList("It is certain.",
+                    "It is decidedly so.",
+                    "Without a doubt.",
+                    "Yes, definitely.",
+                    "That would be a yes.",
+                    "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();
+    }
+}

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

@@ -0,0 +1,11 @@
+package wtf.beatrice.hidekobot.commands.base;
+
+import net.dv8tion.jda.api.Permission;
+
+public class Say
+{
+
+    public static Permission getPermission() {
+        return Permission.MESSAGE_MANAGE;
+    }
+}

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

@@ -0,0 +1,320 @@
+package wtf.beatrice.hidekobot.commands.base;
+
+import net.dv8tion.jda.api.EmbedBuilder;
+import net.dv8tion.jda.api.entities.Message;
+import net.dv8tion.jda.api.entities.MessageEmbed;
+import net.dv8tion.jda.api.entities.User;
+import net.dv8tion.jda.api.entities.emoji.Emoji;
+import net.dv8tion.jda.api.events.interaction.component.ButtonInteractionEvent;
+import net.dv8tion.jda.api.interactions.components.ActionRow;
+import net.dv8tion.jda.api.interactions.components.ItemComponent;
+import net.dv8tion.jda.api.interactions.components.buttons.Button;
+import org.apache.commons.text.StringEscapeUtils;
+import org.apache.commons.text.WordUtils;
+import org.jsoup.nodes.Element;
+import org.jsoup.select.Elements;
+import wtf.beatrice.hidekobot.Cache;
+import wtf.beatrice.hidekobot.datasources.DatabaseSource;
+import wtf.beatrice.hidekobot.util.SerializationUtil;
+
+import java.util.*;
+
+public class UrbanDictionary
+{
+
+    public static LinkedList<String> getCommandLabels()
+    { return new LinkedList<>(Arrays.asList("urban", "urbandictionary", "ud")); }
+
+
+    public static String getBaseUrl() {
+        return "https://www.urbandictionary.com/define.php?term=";
+    }
+
+    public static Button getPreviousPageButton()
+    {
+        return Button.primary("urban_previouspage", "Back")
+                .withEmoji(Emoji.fromFormatted("⬅️"));
+    }
+
+    public static Button getNextPageButton()
+    {
+        return Button.primary("urban_nextpage", "Next")
+                .withEmoji(Emoji.fromFormatted("➡️"));
+    }
+
+    public static Button getDeleteButton()
+    {
+        return Button.danger("generic_dismiss", "Delete")
+                .withEmoji(Emoji.fromFormatted("\uD83D\uDDD1️"));
+    }
+
+    public static String getNoArgsError() {
+        return "\uD83D\uDE22 I need to know what to search for!";
+    }
+
+    public static String sanitizeArgs(String term, boolean forUrl)
+    {
+        term = term.replaceAll("[^\\d\\w\\s]", ""); // only keep letters, numbers and spaces
+        term = WordUtils.capitalizeFully(term); // Make Every Word Start With A Capital Letter
+        if(forUrl) term = term.replaceAll("\\s+", "+"); // replace all whitespaces with + for the url
+        if (term.length() > 64) term = term.substring(0, 64); // cut it to length to avoid abuse
+        return term;
+    }
+
+    public static String generateUrl(String term)
+    {
+        return getBaseUrl() + sanitizeArgs(term, true);
+    }
+
+    public static MessageEmbed buildEmbed(String term,
+                                   String url,
+                                   User author,
+                                   UrbanSearch search,
+                                   int page)
+    {
+
+        EmbedBuilder embedBuilder = new EmbedBuilder();
+        embedBuilder.setColor(Cache.getBotColor());
+        embedBuilder.setTitle(term + ", on Urban Dictionary", url);
+        embedBuilder.setAuthor(author.getAsTag(), null, author.getAvatarUrl());
+        embedBuilder.addField("Definition", search.getPlaintextMeanings().get(page), false);
+        embedBuilder.addField("Example", search.getPlaintextExamples().get(page), false);
+        embedBuilder.addField("Submission",
+                "*Entry " + (page+1) + " | Sent by " + search.getContributorsNames().get(page) +
+                        " on " + search.getSubmissionDates().get(page) + "*",
+                false);
+
+        return embedBuilder.build();
+    }
+
+
+    public static String getTermNotFoundError()
+    {
+        return "\uD83D\uDE22 I couldn't find that term!";
+    }
+
+    public static void track(Message message, User user, UrbanSearch search, String sanitizedTerm)
+    {
+        Cache.getDatabaseSource().queueDisabling(message);
+        Cache.getDatabaseSource().trackRanCommandReply(message, user);
+        Cache.getDatabaseSource().trackUrban(search.getSerializedMeanings(),
+                search.getSerializedExamples(),
+                search.getSerializedContributors(),
+                search.getSerializedDates(),
+                message,
+                sanitizedTerm);
+    }
+
+    public static void changePage(ButtonInteractionEvent event, ChangeType changeType)
+    {
+        String messageId = event.getMessageId();
+        DatabaseSource database = Cache.getDatabaseSource();
+
+        // check if the user interacting is the same one who ran the command
+        if (!(database.isUserTrackedFor(event.getUser().getId(), messageId))) {
+            event.reply("❌ You did not run this command!").setEphemeral(true).queue();
+            return;
+        }
+
+        // get current page and calculate how many pages there are
+        int page = Cache.getDatabaseSource().getUrbanPage(messageId);
+
+        String term = database.getUrbanTerm(messageId);
+        String url = generateUrl(term);
+
+        // get serialized parameters
+        String serializedMeanings = database.getUrbanMeanings(messageId);
+        String serializedExamples = database.getUrbanExamples(messageId);
+        String serializedContributors = database.getUrbanContributors(messageId);
+        String serializedDates = database.getUrbanDates(messageId);
+
+        // construct object by passing serialized parameters
+        UrbanSearch search = new UrbanSearch(serializedMeanings,
+                serializedExamples, serializedContributors, serializedDates);
+
+        // move to new page
+        if(changeType == ChangeType.NEXT)
+            page++;
+        else if(changeType == ChangeType.PREVIOUS)
+            page--;
+
+        term = UrbanDictionary.sanitizeArgs(term, false);
+
+        // generate embed with new results
+        MessageEmbed updatedEmbed = UrbanDictionary.buildEmbed(term, url, event.getUser(), search, page);
+
+        // get all attached components and check which ones need to be enabled or disabled
+        List<ItemComponent> components = new ArrayList<>();
+
+        if(page > 0)
+        {
+            components.add(UrbanDictionary.getPreviousPageButton().asEnabled());
+        } else {
+            components.add(UrbanDictionary.getPreviousPageButton().asDisabled());
+        }
+
+        if(page + 1 == search.getPages())
+        {
+            components.add(UrbanDictionary.getNextPageButton().asDisabled());
+        } else {
+            components.add(UrbanDictionary.getNextPageButton().asEnabled());
+        }
+
+        // update the components on the object
+        components.add(UrbanDictionary.getDeleteButton());
+        ActionRow currentRow = ActionRow.of(components);
+
+        // update the message
+        event.editComponents(currentRow).setEmbeds(updatedEmbed).queue();
+        database.setUrbanPage(messageId, page);
+        database.resetExpiryTimestamp(messageId);
+    }
+
+    public static class UrbanSearch
+    {
+        final LinkedList<String> plaintextMeanings;
+        final LinkedList<String> plaintextExamples;
+        final LinkedList<String> contributorsNames;
+        final LinkedList<String> submissionDates;
+
+        final String serializedMeanings;
+        final String serializedExamples;
+        final String serializedContributors;
+        final String serializedDates;
+
+        final int pages;
+
+        public UrbanSearch(String serializedMeanings,
+                           String serializedExamples,
+                           String serializedContributors,
+                           String serializedDates)
+        {
+            this.serializedMeanings = serializedMeanings;
+            this.serializedExamples = serializedExamples;
+            this.serializedContributors = serializedContributors;
+            this.serializedDates = serializedDates;
+
+            this.plaintextMeanings = SerializationUtil.deserializeBase64(serializedMeanings);
+            this.plaintextExamples = SerializationUtil.deserializeBase64(serializedExamples);
+            this.contributorsNames = SerializationUtil.deserializeBase64(serializedContributors);
+            this.submissionDates = SerializationUtil.deserializeBase64(serializedDates);
+
+            this.pages = submissionDates.size();
+        }
+
+        public UrbanSearch(Elements definitions)
+        {
+            plaintextMeanings = new LinkedList<>();
+            plaintextExamples = new LinkedList<>();
+            contributorsNames = new LinkedList<>();
+            submissionDates = new LinkedList<>();
+
+            for(Element definition : definitions)
+            {
+                Elements meaningSingleton = definition.getElementsByClass("meaning");
+                if(meaningSingleton.isEmpty())
+                {
+                    plaintextMeanings.add(" ");
+                } else
+                {
+                    Element meaning = meaningSingleton.get(0);
+                    String text = meaning.html()
+                            .replaceAll("<br\\s*?>", "\n") // keep newlines
+                            .replaceAll("<.*?>", ""); // remove all other html tags
+                    // this is used to fix eg. &amp; being shown literally instead of being parsed
+                    text = StringEscapeUtils.unescapeHtml4(text);
+                    // discord only allows 1024 characters for embed fields
+                    if(text.length() > 1024) text = text.substring(0, 1020) + "...";
+                    plaintextMeanings.add(text);
+                }
+
+                Elements exampleSingleton = definition.getElementsByClass("example");
+
+                if(exampleSingleton.isEmpty())
+                {
+                    plaintextExamples.add(" ");
+                } else
+                {
+                    Element example = exampleSingleton.get(0);
+                    String text = example.html()
+                            .replaceAll("<br\\s*?>", "\n") // keep newlines
+                            .replaceAll("<.*?>", ""); // remove all other html tags
+                    // this is used to fix eg. &amp; being shown literally instead of being parsed
+                    text = StringEscapeUtils.unescapeHtml4(text);
+                    // discord only allows 1024 characters for embed fields
+                    if(text.length() > 1024) text = text.substring(0, 1020) + "...";
+                    plaintextExamples.add(text);
+                }
+
+                Elements contributorSingleton = definition.getElementsByClass("contributor");
+                if(contributorSingleton.isEmpty())
+                {
+                    contributorsNames.add("Unknown");
+                } else
+                {
+                    Element contributor = contributorSingleton.get(0);
+
+                    String htmlContributor = contributor.html();
+                    String htmlContributorName = contributor.select("a").html();
+                    String htmlSubmitDate = htmlContributor.substring(
+                            htmlContributor.indexOf("</a>") + 4);
+
+                    contributorsNames.add(htmlContributorName
+                            .replaceAll("<.*?>", "")); // remove all html tags;
+
+                    submissionDates.add(htmlSubmitDate
+                            .replaceAll("<.*?>", "")); // remove all html tags;
+                }
+            }
+
+            serializedMeanings = SerializationUtil.serializeBase64(plaintextMeanings);
+            serializedExamples = SerializationUtil.serializeBase64(plaintextExamples);
+            serializedContributors = SerializationUtil.serializeBase64(contributorsNames);
+            serializedDates = SerializationUtil.serializeBase64(submissionDates);
+
+            pages = submissionDates.size();
+        }
+
+        public List<String> getPlaintextMeanings() {
+            return this.plaintextMeanings;
+        }
+
+        public List<String> getPlaintextExamples() {
+            return this.plaintextExamples;
+        }
+
+        public List<String> getContributorsNames() {
+            return this.contributorsNames;
+        }
+
+        public List<String> getSubmissionDates() {
+            return this.submissionDates;
+        }
+
+        public String getSerializedMeanings() {
+            return serializedMeanings;
+        }
+
+        public String getSerializedExamples() {
+            return serializedExamples;
+        }
+
+        public String getSerializedContributors() {
+            return serializedContributors;
+        }
+
+        public String getSerializedDates() {
+            return serializedDates;
+        }
+
+        public int getPages() {
+            return pages;
+        }
+    }
+
+    public enum ChangeType
+    {
+        NEXT,
+        PREVIOUS;
+    }
+}

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

@@ -0,0 +1,78 @@
+package wtf.beatrice.hidekobot.commands.message;
+
+import net.dv8tion.jda.api.Permission;
+import net.dv8tion.jda.api.events.message.MessageReceivedEvent;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+import wtf.beatrice.hidekobot.Cache;
+import wtf.beatrice.hidekobot.commands.base.Alias;
+import wtf.beatrice.hidekobot.objects.commands.CommandCategory;
+import wtf.beatrice.hidekobot.objects.commands.MessageCommand;
+
+import java.util.Arrays;
+import java.util.LinkedList;
+import java.util.List;
+
+public class AliasCommand implements MessageCommand
+{
+
+    @Override
+    public LinkedList<String> getCommandLabels() {
+        return new LinkedList<>(Arrays.asList("alias", "aliases"));
+    }
+
+    @Nullable
+    @Override
+    public List<Permission> getPermissions() {
+        return null; // anyone can use it
+    }
+
+    @Override
+    public boolean passRawArgs() {
+        return false;
+    }
+
+    @NotNull
+    @Override
+    public CommandCategory getCategory() {
+        return CommandCategory.TOOLS;
+    }
+
+    @NotNull
+    @Override
+    public String getDescription() {
+        return "See other command aliases.";
+    }
+
+    @Nullable
+    @Override
+    public String getUsage() {
+        return "<command>";
+    }
+
+    @Override
+    public void runCommand(MessageReceivedEvent event, String label, String[] args)
+    {
+        if(args.length == 0)
+        {
+            event.getMessage().reply("\uD83D\uDE20 Hey, you have to specify a command!").queue();
+            return;
+        }
+
+        String commandLabel = args[0].toLowerCase();
+        MessageCommand command = Cache.getMessageCommandListener().getRegisteredCommand(commandLabel);
+        if(command == null)
+        {
+            event.getMessage().reply("Unrecognized command: `" + commandLabel + "`!").queue(); // todo prettier
+            return;
+        }
+
+        String aliases = Alias.generateNiceAliases(command);
+        aliases =  "Aliases for **" + command.getCommandLabels().get(0) + "**: " + aliases;
+
+        event.getMessage()
+                .reply(aliases)
+                .queue();
+
+    }
+}

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

@@ -0,0 +1,100 @@
+package wtf.beatrice.hidekobot.commands.message;
+
+import net.dv8tion.jda.api.Permission;
+import net.dv8tion.jda.api.entities.Mentions;
+import net.dv8tion.jda.api.entities.MessageEmbed;
+import net.dv8tion.jda.api.entities.User;
+import net.dv8tion.jda.api.events.message.MessageReceivedEvent;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+import wtf.beatrice.hidekobot.Cache;
+import wtf.beatrice.hidekobot.HidekoBot;
+import wtf.beatrice.hidekobot.commands.base.Avatar;
+import wtf.beatrice.hidekobot.objects.commands.CommandCategory;
+import wtf.beatrice.hidekobot.objects.commands.MessageCommand;
+
+import java.util.Collections;
+import java.util.LinkedList;
+import java.util.List;
+
+public class AvatarCommand  implements MessageCommand
+{
+
+    @Override
+    public LinkedList<String> getCommandLabels() {
+        return new LinkedList<>(Collections.singletonList("avatar"));
+    }
+
+    @Nullable
+    @Override
+    public List<Permission> getPermissions() {
+        return null; // anyone can use it
+    }
+
+    @Override
+    public boolean passRawArgs() {
+        return false;
+    }
+
+    @NotNull
+    @Override
+    public String getDescription() {
+        return "Get someone's avatar, or your own. You can additionally specify a resolution.";
+    }
+
+    @Nullable
+    @Override
+    public String getUsage() {
+        return "[mentioned user] [resolution]";
+    }
+
+    @NotNull
+    @Override
+    public CommandCategory getCategory() {
+        return CommandCategory.TOOLS;
+    }
+
+    @Override
+    public void runCommand(MessageReceivedEvent event, String label, String[] args)
+    {
+        int[] acceptedSizes = Cache.getSupportedAvatarResolutions();
+
+        User user;
+        int resolution = -1;
+
+        // we have no specific order for user and resolution, so let's try parsing any arg as resolution
+        // (mentions are handled differently by a specific method)
+        boolean resFound = false;
+
+        for (String arg : args) {
+            try {
+                int givenRes = Integer.parseInt(arg);
+                resolution = Avatar.parseResolution(givenRes);
+                resFound = true;
+                break;
+            } catch (NumberFormatException ignored) {
+            }
+        }
+
+        // fallback in case we didn't find any specified resolution
+        if(!resFound) resolution = Avatar.parseResolution(512);
+
+        // check if someone is mentioned
+        Mentions mentions = event.getMessage().getMentions();
+        if(mentions.getMentions().isEmpty())
+        {
+            user = event.getAuthor();
+        } else
+        {
+            String mentionedId = mentions.getMentions().get(0).getId();
+            user = HidekoBot.getAPI().retrieveUserById(mentionedId).complete();
+        }
+
+        // in case of issues, fallback to the sender
+        if(user == null) user = event.getAuthor();
+
+        // send a response
+        MessageEmbed embed = Avatar.buildEmbed(resolution, user);
+        event.getMessage().replyEmbeds(embed).queue();
+    }
+}

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

@@ -3,9 +3,11 @@ package wtf.beatrice.hidekobot.commands.message;
 import net.dv8tion.jda.api.Permission;
 import net.dv8tion.jda.api.entities.MessageEmbed;
 import net.dv8tion.jda.api.events.message.MessageReceivedEvent;
+import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import wtf.beatrice.hidekobot.Cache;
 import wtf.beatrice.hidekobot.commands.base.BotInfo;
+import wtf.beatrice.hidekobot.objects.commands.CommandCategory;
 import wtf.beatrice.hidekobot.objects.commands.MessageCommand;
 
 import java.util.Collections;
@@ -31,6 +33,24 @@ public class BotInfoCommand implements MessageCommand
         return false;
     }
 
+    @NotNull
+    @Override
+    public String getDescription() {
+        return "Get general info about the bot.";
+    }
+
+    @Nullable
+    @Override
+    public String getUsage() {
+        return null;
+    }
+
+    @NotNull
+    @Override
+    public CommandCategory getCategory() {
+        return CommandCategory.TOOLS;
+    }
+
     @Override
     public void runCommand(MessageReceivedEvent event, String label, String[] args) {
 

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

@@ -4,8 +4,11 @@ import net.dv8tion.jda.api.Permission;
 import net.dv8tion.jda.api.entities.Message;
 import net.dv8tion.jda.api.events.message.MessageReceivedEvent;
 import net.dv8tion.jda.api.interactions.components.buttons.Button;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 import wtf.beatrice.hidekobot.Cache;
 import wtf.beatrice.hidekobot.commands.base.ClearChat;
+import wtf.beatrice.hidekobot.objects.commands.CommandCategory;
 import wtf.beatrice.hidekobot.objects.commands.MessageCommand;
 
 import java.util.Collections;
@@ -28,6 +31,24 @@ public class ClearCommand implements MessageCommand
         return false;
     }
 
+    @NotNull
+    @Override
+    public CommandCategory getCategory() {
+        return CommandCategory.MODERATION;
+    }
+
+    @NotNull
+    @Override
+    public String getDescription() {
+        return "Clear the current channel's chat history.";
+    }
+
+    @Nullable
+    @Override
+    public String getUsage() {
+        return "[amount]";
+    }
+
     @Override
     public void runCommand(MessageReceivedEvent event, String label, String[] args)
     {
@@ -43,7 +64,18 @@ public class ClearCommand implements MessageCommand
         // get the amount from the command args.
         Integer toDeleteAmount;
         if (args.length == 0) toDeleteAmount = 1;
-        else toDeleteAmount = Integer.parseInt(args[0]);
+        else
+        {
+            try {
+                toDeleteAmount = Integer.parseInt(args[0]);
+            } catch (NumberFormatException e)
+            {
+                toDeleteAmount = 0;
+            }
+        }
+
+        // cap the amount to avoid abuse.
+        if(toDeleteAmount > ClearChat.getMaxAmount()) toDeleteAmount = 0;
 
         error = ClearChat.checkDeleteAmount(toDeleteAmount);
         if (error != null) {
@@ -64,14 +96,16 @@ public class ClearCommand implements MessageCommand
 
         // edit the message text and attach a button.
         Button dismiss = ClearChat.getDismissButton();
-        // ^ todo: maybe the dismiss button should also delete the original message sent by the user?
-        // todo: but then, we need to differentiate between command type in the database, and store
-        // todo: that message's id too.
-        botMessage = botMessage.editMessage(content).setActionRow(dismiss).complete();
+        Message finalMessage = event.getChannel().sendMessage(content).setActionRow(dismiss).complete();
 
         // add the message to database.
-        Cache.getDatabaseSource().queueDisabling(botMessage);
-        Cache.getDatabaseSource().trackRanCommandReply(botMessage, event.getAuthor());
+        Cache.getDatabaseSource().queueDisabling(finalMessage);
+        Cache.getDatabaseSource().trackRanCommandReply(finalMessage, event.getAuthor());
+
+        // delete the sender's message.
+        event.getMessage().delete().queue();
+        // delete the "clearing" info message.
+        botMessage.delete().queue();
 
     }
 

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

@@ -2,8 +2,10 @@ package wtf.beatrice.hidekobot.commands.message;
 
 import net.dv8tion.jda.api.Permission;
 import net.dv8tion.jda.api.events.message.MessageReceivedEvent;
+import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import wtf.beatrice.hidekobot.commands.base.CoinFlip;
+import wtf.beatrice.hidekobot.objects.commands.CommandCategory;
 import wtf.beatrice.hidekobot.objects.commands.MessageCommand;
 
 import java.util.Arrays;
@@ -29,6 +31,24 @@ public class CoinFlipCommand implements MessageCommand
         return false;
     }
 
+    @NotNull
+    @Override
+    public String getDescription() {
+        return "Flip a coin.";
+    }
+
+    @Nullable
+    @Override
+    public String getUsage() {
+        return null;
+    }
+
+    @NotNull
+    @Override
+    public CommandCategory getCategory() {
+        return CommandCategory.FUN;
+    }
+
     @Override
     public void runCommand(MessageReceivedEvent event, String label, String[] args) {
 

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

@@ -0,0 +1,205 @@
+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.NotNull;
+import org.jetbrains.annotations.Nullable;
+import wtf.beatrice.hidekobot.Cache;
+import wtf.beatrice.hidekobot.objects.Dice;
+import wtf.beatrice.hidekobot.objects.commands.CommandCategory;
+import wtf.beatrice.hidekobot.objects.commands.MessageCommand;
+
+import java.util.*;
+
+public class DiceRollCommand implements MessageCommand
+{
+    @Override
+    public LinkedList<String> getCommandLabels() {
+        return new LinkedList<>(Arrays.asList("diceroll", "droll", "roll"));
+    }
+
+    @Nullable
+    @Override
+    public List<Permission> getPermissions() {
+        return null; // anyone can use it
+    }
+
+    @Override
+    public boolean passRawArgs() {
+        return false;
+    }
+
+    @NotNull
+    @Override
+    public String getDescription() {
+        return "Roll dice. You can roll multiple dice at the same time." +
+                "\nExamples:" +
+                "\n - `d8 10` to roll an 8-sided die 10 times." +
+                "\n - `d12 3 d5 10` to roll a 12-sided die 3 times, and then a 5-sided die 10 times." +
+                "\n - `30` to roll a standard 6-sided die 30 times." +
+                "\n - `d10` to roll a 10-sided die once.";
+    }
+
+    @Nullable
+    @Override
+    public String getUsage() {
+        return "[dice size] [rolls]";
+    }
+
+    @NotNull
+    @Override
+    public CommandCategory getCategory() {
+        return CommandCategory.FUN;
+    }
+
+    @Override
+    public void runCommand(MessageReceivedEvent event, String label, String[] args)
+    {
+        LinkedHashMap<Dice, Integer> dicesToRoll = new LinkedHashMap<>();
+        String diceRegex = "d[0-9]+";
+        String amountRegex = "[0-9]+";
+
+        Dice currentDice = null;
+        int currentAmount;
+        UUID lastPushedDice = null;
+        int totalRolls = 0;
+
+        for(String arg : args)
+        {
+            if(totalRolls > 200)
+            {
+                event.getMessage().reply("Too many total rolls!").queue();
+                return;
+            }
+
+            if(arg.matches(amountRegex))
+            {
+                currentAmount = Integer.parseInt(arg);
+
+                if(currentDice == null)
+                {
+                    currentDice = new Dice(6);
+                } else {
+                    currentDice = new Dice(currentDice);
+                }
+
+                if(currentAmount > 100)
+                {
+                    event.getMessage().reply("Too many rolls (`" + currentAmount + "`)!").queue();
+                    return;
+                }
+
+                lastPushedDice = currentDice.getUUID();
+                dicesToRoll.put(currentDice, currentAmount);
+                totalRolls += currentAmount;
+            }
+            else if(arg.matches(diceRegex))
+            {
+                int sides = Integer.parseInt(arg.substring(1));
+
+                if(sides > 10000)
+                {
+                    event.getMessage().reply("Too many sides (`" + sides + "`)!").queue();
+                    return;
+                }
+
+                if(args.length == 1)
+                {
+                    dicesToRoll.put(new Dice(sides), 1);
+                    totalRolls++;
+                } else
+                {
+                    if(currentDice != null)
+                    {
+                        if(lastPushedDice == null || !lastPushedDice.equals(currentDice.getUUID()))
+                        {
+                            dicesToRoll.put(currentDice, 1);
+                            lastPushedDice = currentDice.getUUID();
+                            totalRolls++;
+                        }
+                    }
+
+                    currentDice = new Dice(sides);
+                }
+            }
+        }
+
+        if(lastPushedDice == null)
+        {
+            if(currentDice != null)
+            {
+                dicesToRoll.put(currentDice, 1);
+                totalRolls++;
+            }
+        } else
+        {
+            if(!lastPushedDice.equals(currentDice.getUUID()))
+            {
+                dicesToRoll.put(new Dice(currentDice), 1);
+                totalRolls++;
+            }
+        }
+
+        LinkedList<Dice> rolledDices = new LinkedList<>();
+
+        // in case no dice was specified (or invalid), roll a standard 6-sided dice.
+        if(dicesToRoll.isEmpty())
+        {
+            Dice standardDice = new Dice(6);
+            dicesToRoll.put(standardDice, 1);
+            totalRolls = 1;
+        }
+
+        for(Dice dice : dicesToRoll.keySet())
+        {
+            for(int roll = 0; roll < dicesToRoll.get(dice); roll++)
+            {
+                dice.roll();
+                rolledDices.add(new Dice(dice));
+            }
+        }
+
+        EmbedBuilder embedBuilder = new EmbedBuilder();
+
+        embedBuilder.setColor(Cache.getBotColor());
+        embedBuilder.setAuthor(event.getAuthor().getAsTag(), null, event.getAuthor().getAvatarUrl());
+        embedBuilder.setTitle("Dice Roll");
+
+        StringBuilder message = new StringBuilder();
+        int total = 0;
+
+        int previousDiceSides = 0;
+        for (Dice dice : rolledDices) {
+            int diceSize = dice.getSides();
+
+            if (previousDiceSides != diceSize) {
+                message.append("\nd").append(diceSize).append(": ");
+                previousDiceSides = diceSize;
+            } else if (previousDiceSides != 0) {
+                message.append(", ");
+            }
+
+            message.append("`").append(dice.getValue()).append("`");
+
+            total += dice.getValue();
+        }
+
+        // discord doesn't allow embed fields to be longer than 1024 and errors out
+        if(message.length() > 1024)
+        {
+            event.getMessage().reply("Too many rolls!").queue();
+            return;
+        }
+
+        embedBuilder.addField("\uD83C\uDFB2 Rolls", message.toString(), false);
+
+        String rolls = totalRolls == 1 ? "roll" : "rolls";
+
+        embedBuilder.addField("✨ Total", totalRolls + " " + rolls + ": " + total, false);
+
+
+        event.getMessage().replyEmbeds(embedBuilder.build()).queue();
+    }
+
+}

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

@@ -2,6 +2,9 @@ package wtf.beatrice.hidekobot.commands.message;
 
 import net.dv8tion.jda.api.Permission;
 import net.dv8tion.jda.api.events.message.MessageReceivedEvent;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+import wtf.beatrice.hidekobot.objects.commands.CommandCategory;
 import wtf.beatrice.hidekobot.objects.commands.MessageCommand;
 
 import java.util.Arrays;
@@ -24,6 +27,24 @@ public class HelloCommand implements MessageCommand
         return false;
     }
 
+    @NotNull
+    @Override
+    public String getDescription() {
+        return "Get pinged by the bot.";
+    }
+
+    @Nullable
+    @Override
+    public String getUsage() {
+        return null;
+    }
+
+    @NotNull
+    @Override
+    public CommandCategory getCategory() {
+        return CommandCategory.FUN;
+    }
+
     @Override
     public void runCommand(MessageReceivedEvent event, String label, String[] args)
     {

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

@@ -0,0 +1,158 @@
+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.apache.commons.text.WordUtils;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+import wtf.beatrice.hidekobot.Cache;
+import wtf.beatrice.hidekobot.commands.base.Alias;
+import wtf.beatrice.hidekobot.commands.base.Say;
+import wtf.beatrice.hidekobot.objects.commands.CommandCategory;
+import wtf.beatrice.hidekobot.objects.commands.MessageCommand;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.LinkedList;
+import java.util.List;
+
+public class HelpCommand implements MessageCommand
+{
+
+
+    @Override
+    public LinkedList<String> getCommandLabels() {
+        return new LinkedList<>(Collections.singletonList("help"));
+    }
+
+    @Nullable
+    @Override
+    public List<Permission> getPermissions() { return null; }
+
+    @Override
+    public boolean passRawArgs() {
+        return false;
+    }
+
+    @NotNull
+    @Override
+    public String getDescription() {
+        return "Get general help on the bot. Specify a command if you want specific help about that command.";
+    }
+
+    @Nullable
+    @Override
+    public String getUsage() {
+        return "[command]";
+    }
+
+    @NotNull
+    @Override
+    public CommandCategory getCategory() {
+        return CommandCategory.TOOLS;
+    }
+
+    @Override
+    public void runCommand(MessageReceivedEvent event, String label, String[] args)
+    {
+        LinkedHashMap<CommandCategory, LinkedList<MessageCommand>> commandCategories = new LinkedHashMap<>();
+
+        if(args.length == 0)
+        {
+            for(CommandCategory category : CommandCategory.values())
+            {
+                LinkedList<MessageCommand> commandsOfThisCategory = new LinkedList<>();
+                for (MessageCommand command : Cache.getMessageCommandListener().getRegisteredCommands())
+                {
+                    if(command.getCategory().equals(category))
+                    {
+                        commandsOfThisCategory.add(command);
+                    }
+                }
+
+                commandCategories.put(category, commandsOfThisCategory);
+            }
+
+            EmbedBuilder embedBuilder = new EmbedBuilder();
+            embedBuilder.setColor(Cache.getBotColor());
+            embedBuilder.setTitle("Bot Help");
+
+            embedBuilder.addField("General Help",
+                    "Type `" + Cache.getBotPrefix() + " help [command]` to get help on a specific command." +
+                            "\nYou will find a list of commands organized in categories below.",
+                    false);
+
+            for(CommandCategory category : commandCategories.keySet())
+            {
+                StringBuilder commandsList = new StringBuilder();
+                LinkedList<MessageCommand> commandsOfThisCategory = commandCategories.get(category);
+
+                for(int pos = 0; pos < commandsOfThisCategory.size(); pos++)
+                {
+                    MessageCommand command = commandsOfThisCategory.get(pos);
+                    commandsList.append("`").append(command.getCommandLabels().get(0)).append("`");
+
+                    if(pos + 1 != commandsOfThisCategory.size())
+                        commandsList.append(", "); // separate with comma except on last run
+                }
+
+                String niceCategoryName = category.name().replace("_", " ");
+                niceCategoryName = WordUtils.capitalizeFully(niceCategoryName);
+                niceCategoryName = category.getEmoji() + " " + niceCategoryName;
+
+                embedBuilder.addField(niceCategoryName, commandsList.toString(), false);
+            }
+
+            event.getMessage().replyEmbeds(embedBuilder.build()).queue();
+        } else {
+
+            String commandLabel = args[0].toLowerCase();
+            MessageCommand command = Cache.getMessageCommandListener().getRegisteredCommand(commandLabel);
+            if(command == null)
+            {
+                event.getMessage().reply("Unrecognized command: `" + commandLabel + "`!").queue(); // todo prettier
+                return;
+            }
+
+            commandLabel = command.getCommandLabels().get(0);
+            String usage = "`" + Cache.getBotPrefix() + " " + commandLabel;
+            String internalUsage = command.getUsage();
+            if(internalUsage != null) usage += " " + internalUsage;
+            usage += "`";
+
+            String aliases = Alias.generateNiceAliases(command);
+
+            List<Permission> permissions = command.getPermissions();
+            StringBuilder permissionsStringBuilder = new StringBuilder();
+            if(permissions == null)
+            {
+                permissionsStringBuilder = new StringBuilder("Available to everyone");
+            } else {
+                for(int i = 0; i < permissions.size(); i++)
+                {
+                    Permission permission = permissions.get(i);
+                    permissionsStringBuilder.append("**").append(permission.getName()).append("**");
+
+                    if(i + 1 != permissions.size())
+                        permissionsStringBuilder.append(", "); // separate with comma expect on last iteration
+                }
+            }
+
+            String title = command.getCategory().getEmoji() +
+                    " \"" + WordUtils.capitalizeFully(commandLabel + "\" help");
+
+            EmbedBuilder embedBuilder = new EmbedBuilder();
+
+            embedBuilder.setColor(Cache.getBotColor());
+            embedBuilder.setTitle(title);
+
+            embedBuilder.addField("Description", command.getDescription(), false);
+            embedBuilder.addField("Usage", usage, false);
+            embedBuilder.addField("Aliases", aliases, false);
+            embedBuilder.addField("Permissions", permissionsStringBuilder.toString(), false);
+
+            event.getMessage().replyEmbeds(embedBuilder.build()).queue();
+        }
+    }
+}

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

@@ -5,8 +5,10 @@ import net.dv8tion.jda.api.entities.MessageEmbed;
 import net.dv8tion.jda.api.entities.emoji.Emoji;
 import net.dv8tion.jda.api.events.message.MessageReceivedEvent;
 import net.dv8tion.jda.api.interactions.components.buttons.Button;
+import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import wtf.beatrice.hidekobot.commands.base.Invite;
+import wtf.beatrice.hidekobot.objects.commands.CommandCategory;
 import wtf.beatrice.hidekobot.objects.commands.MessageCommand;
 
 import java.util.Collections;
@@ -32,6 +34,24 @@ public class InviteCommand implements MessageCommand
         return false;
     }
 
+    @NotNull
+    @Override
+    public String getDescription() {
+        return "Get the bot's invite link.";
+    }
+
+    @Nullable
+    @Override
+    public String getUsage() {
+        return null;
+    }
+
+    @NotNull
+    @Override
+    public CommandCategory getCategory() {
+        return CommandCategory.MODERATION;
+    }
+
     @Override
     public void runCommand(MessageReceivedEvent event, String label, String[] args)
     {

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

@@ -0,0 +1,113 @@
+package wtf.beatrice.hidekobot.commands.message;
+
+import net.dv8tion.jda.api.EmbedBuilder;
+import net.dv8tion.jda.api.Permission;
+import net.dv8tion.jda.api.entities.IMentionable;
+import net.dv8tion.jda.api.entities.Mentions;
+import net.dv8tion.jda.api.entities.User;
+import net.dv8tion.jda.api.events.message.MessageReceivedEvent;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+import wtf.beatrice.hidekobot.Cache;
+import wtf.beatrice.hidekobot.HidekoBot;
+import wtf.beatrice.hidekobot.objects.commands.CommandCategory;
+import wtf.beatrice.hidekobot.objects.commands.MessageCommand;
+import wtf.beatrice.hidekobot.util.RandomUtil;
+
+import java.util.Arrays;
+import java.util.LinkedList;
+import java.util.List;
+
+public class LoveCalculatorCommand implements MessageCommand
+{
+
+
+    @Override
+    public LinkedList<String> getCommandLabels()
+    {
+        return new LinkedList<>(Arrays.asList("lovecalc", "lovecalculator", "lc"));
+    }
+
+    @Nullable
+    @Override
+    public List<Permission> getPermissions() {
+        return null; //anyone can use it
+    }
+
+    @Override
+    public boolean passRawArgs() {
+        return false;
+    }
+
+    @NotNull
+    @Override
+    public String getDescription() {
+        return "Calculate how much two people love each other. You can mention two people or just one.";
+    }
+
+    @Nullable
+    @Override
+    public String getUsage() {
+        return "<person 1> [person 2]";
+    }
+
+    @NotNull
+    @Override
+    public CommandCategory getCategory() {
+        return CommandCategory.FUN;
+    }
+
+    @Override
+    public void runCommand(MessageReceivedEvent event, String label, String[] args)
+    {
+
+        Mentions mentionsObj = event.getMessage().getMentions();
+        List<IMentionable> mentions = mentionsObj.getMentions();
+
+
+        if(args.length == 0 || mentions.isEmpty())
+        {
+            event.getMessage()
+                    .reply("\uD83D\uDE22 I need to know who to check! Please mention them.")
+                    .queue();
+            return;
+        }
+
+        User user1, user2;
+
+        String mentionedUserId = mentions.get(0).getId();
+        user1 = HidekoBot.getAPI().retrieveUserById(mentionedUserId).complete();
+
+        if(mentions.size() == 1)
+        {
+            user2 = event.getAuthor();
+        } else {
+            mentionedUserId = mentions.get(1).getId();
+            user2 = HidekoBot.getAPI().retrieveUserById(mentionedUserId).complete();
+        }
+
+        int loveAmount = RandomUtil.getRandomNumber(0, 100);
+
+        String formattedAmount = loveAmount + "%";
+        if(loveAmount <= 30) formattedAmount += "... \uD83D\uDE22";
+        else if(loveAmount < 60) formattedAmount += "! \uD83E\uDDD0";
+        else if(loveAmount < 75) formattedAmount += "!!! \uD83E\uDD73";
+        else formattedAmount = "✨ " + formattedAmount + "!!! \uD83D\uDE0D\uD83D\uDCA5";
+
+        EmbedBuilder embedBuilder = new EmbedBuilder();
+        embedBuilder.setColor(Cache.getBotColor());
+        embedBuilder.setAuthor(event.getAuthor().getAsTag(), null, event.getAuthor().getAvatarUrl());
+        embedBuilder.setTitle("Love Calculator");
+
+        embedBuilder.addField("\uD83D\uDC65 People",
+                user1.getAsMention() + " & " + user2.getAsMention(),
+                false);
+
+        embedBuilder.addField("❤️\u200D\uD83D\uDD25 Match",
+                formattedAmount,
+                false);
+
+        event.getChannel().sendMessageEmbeds(embedBuilder.build()).queue();
+
+    }
+}

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

@@ -0,0 +1,74 @@
+package wtf.beatrice.hidekobot.commands.message;
+
+import net.dv8tion.jda.api.Permission;
+import net.dv8tion.jda.api.events.message.MessageReceivedEvent;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+import wtf.beatrice.hidekobot.commands.base.MagicBall;
+import wtf.beatrice.hidekobot.objects.commands.CommandCategory;
+import wtf.beatrice.hidekobot.objects.commands.MessageCommand;
+
+import java.util.LinkedList;
+import java.util.List;
+
+public class MagicBallCommand implements MessageCommand
+{
+
+    @Override
+    public LinkedList<String> getCommandLabels() {
+        return MagicBall.getLabels();
+    }
+
+    @Nullable
+    @Override
+    public List<Permission> getPermissions() {
+        return null; // anyone can use it
+    }
+
+    @Override
+    public boolean passRawArgs() {
+        return false;
+    }
+
+    @NotNull
+    @Override
+    public String getDescription() {
+        return "Ask a question to the Magic Ball.";
+    }
+
+    @Nullable
+    @Override
+    public String getUsage() {
+        return "<question>";
+    }
+
+    @NotNull
+    @Override
+    public CommandCategory getCategory() {
+        return CommandCategory.FUN;
+    }
+
+    @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();
+
+
+        event.getChannel().sendMessageEmbeds(MagicBall.generateEmbed(question, event.getAuthor())).queue();
+    }
+}

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

@@ -0,0 +1,69 @@
+package wtf.beatrice.hidekobot.commands.message;
+
+import net.dv8tion.jda.api.Permission;
+import net.dv8tion.jda.api.events.message.MessageReceivedEvent;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+import wtf.beatrice.hidekobot.commands.base.Say;
+import wtf.beatrice.hidekobot.objects.commands.CommandCategory;
+import wtf.beatrice.hidekobot.objects.commands.MessageCommand;
+
+import java.util.Collections;
+import java.util.LinkedList;
+import java.util.List;
+
+public class SayCommand implements MessageCommand
+{
+
+
+    @Override
+    public LinkedList<String> getCommandLabels() {
+        return new LinkedList<>(Collections.singletonList("say"));
+    }
+
+    @Nullable
+    @Override
+    public List<Permission> getPermissions() { return Collections.singletonList(Say.getPermission()); }
+
+    @Override
+    public boolean passRawArgs() {
+        return true;
+    }
+
+    @NotNull
+    @Override
+    public String getDescription() {
+        return "Make the bot say something for you.";
+    }
+
+    @Nullable
+    @Override
+    public String getUsage() {
+        return "<text>";
+    }
+
+    @NotNull
+    @Override
+    public CommandCategory getCategory() {
+        return CommandCategory.TOOLS;
+    }
+
+    @Override
+    public void runCommand(MessageReceivedEvent event, String label, String[] args)
+    {
+
+        String messageContent;
+        if(args.length != 0 && !args[0].isEmpty())
+        {
+            messageContent = args[0];
+        } else {
+            event.getMessage().reply("\uD83D\uDE20 Hey, you have to tell me what to say!")
+                    .queue();
+            return;
+        }
+
+        event.getChannel().sendMessage(messageContent).queue();
+        event.getMessage().delete().queue();
+
+    }
+}

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

@@ -0,0 +1,106 @@
+package wtf.beatrice.hidekobot.commands.message;
+
+import net.dv8tion.jda.api.Permission;
+import net.dv8tion.jda.api.entities.MessageEmbed;
+import net.dv8tion.jda.api.events.message.MessageReceivedEvent;
+import net.dv8tion.jda.api.interactions.components.buttons.Button;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+import org.jsoup.Jsoup;
+import org.jsoup.nodes.Document;
+import org.jsoup.select.Elements;
+import wtf.beatrice.hidekobot.commands.base.UrbanDictionary;
+import wtf.beatrice.hidekobot.objects.commands.CommandCategory;
+import wtf.beatrice.hidekobot.objects.commands.MessageCommand;
+
+import java.io.IOException;
+import java.util.LinkedList;
+import java.util.List;
+
+public class UrbanDictionaryCommand implements MessageCommand
+{
+
+    @Override
+    public LinkedList<String> getCommandLabels() {
+        return UrbanDictionary.getCommandLabels();
+    }
+
+    @Nullable
+    @Override
+    public List<Permission> getPermissions() {
+        return null; //anyone can use it
+    }
+
+    @Override
+    public boolean passRawArgs() {
+        return false;
+    }
+
+    @NotNull
+    @Override
+    public String getDescription() {
+        return "Look something up in the Urban Dictionary.";
+    }
+
+    @Nullable
+    @Override
+    public String getUsage() {
+        return "<query>";
+    }
+
+    @NotNull
+    @Override
+    public CommandCategory getCategory() {
+        return CommandCategory.FUN;
+    }
+
+
+    @Override
+    public void runCommand(MessageReceivedEvent event, String label, String[] args)
+    {
+        if(args.length == 0)
+        {
+            event.getMessage().reply(UrbanDictionary.getNoArgsError()).queue();
+            return;
+        }
+
+        // sanitize args by only keeping letters and numbers, and adding "+" instead of spaces for HTML parsing
+        StringBuilder termBuilder = new StringBuilder();
+        for (int i = 0; i < args.length; i++) {
+            String arg = args[i];
+            termBuilder.append(arg);
+
+            if(i + 1 != args.length) // add spaces between args, but not on the last run
+                termBuilder.append(" ");
+        }
+
+        String term = UrbanDictionary.sanitizeArgs(termBuilder.toString(), false);
+        String url = UrbanDictionary.generateUrl(term);
+
+        Document doc;
+
+        try {
+            doc = Jsoup.connect(url).get();
+        } catch (IOException e) {
+            event.getMessage().reply(UrbanDictionary.getTermNotFoundError()).queue();
+            return;
+        }
+
+        Elements definitions = doc.getElementsByClass("definition");
+        UrbanDictionary.UrbanSearch search = new UrbanDictionary.UrbanSearch(definitions);
+        MessageEmbed embed = UrbanDictionary.buildEmbed(term, url, event.getAuthor(), search, 0);
+
+        // disable next page if we only have one result
+        Button nextPageBtnLocal = UrbanDictionary.getNextPageButton();
+        if(search.getPages() == 1) nextPageBtnLocal = nextPageBtnLocal.asDisabled();
+
+        event.getChannel()
+                .sendMessageEmbeds(embed)
+                .addActionRow(UrbanDictionary.getPreviousPageButton().asDisabled(),
+                        //disabled by default because we're on page 0
+                        nextPageBtnLocal,
+                        UrbanDictionary.getDeleteButton())
+                .queue(message -> UrbanDictionary.track(message, event.getAuthor(), search, term));
+
+    }
+}

src/main/java/wtf/beatrice/hidekobot/commands/slash/AvatarCommand.java

@@ -1,6 +1,6 @@
 package wtf.beatrice.hidekobot.commands.slash;
 
-import net.dv8tion.jda.api.EmbedBuilder;
+import net.dv8tion.jda.api.entities.MessageEmbed;
 import net.dv8tion.jda.api.entities.User;
 import net.dv8tion.jda.api.events.interaction.command.SlashCommandInteractionEvent;
 import net.dv8tion.jda.api.interactions.commands.OptionMapping;
@@ -8,7 +8,7 @@ import net.dv8tion.jda.api.interactions.commands.OptionType;
 import net.dv8tion.jda.api.interactions.commands.build.CommandData;
 import net.dv8tion.jda.api.interactions.commands.build.Commands;
 import org.jetbrains.annotations.NotNull;
-import wtf.beatrice.hidekobot.Cache;
+import wtf.beatrice.hidekobot.commands.base.Avatar;
 import wtf.beatrice.hidekobot.objects.commands.SlashCommandImpl;
 
 public class AvatarCommand extends SlashCommandImpl
@@ -31,9 +31,6 @@ public class AvatarCommand extends SlashCommandImpl
         User user;
         int resolution;
 
-        int[] acceptedSizes = Cache.getSupportedAvatarResolutions();
-
-
         OptionMapping userArg = event.getOption("user");
         if(userArg != null)
         {
@@ -45,57 +42,12 @@ public class AvatarCommand extends SlashCommandImpl
         OptionMapping sizeArg = event.getOption("size");
         if(sizeArg != null)
         {
-            resolution = sizeArg.getAsInt();
-
-            // method to find closest value to accepted values
-            int distance = Math.abs(acceptedSizes[0] - resolution);
-            int idx = 0;
-            for(int c = 1; c < acceptedSizes.length; c++){
-                int cdistance = Math.abs(acceptedSizes[c] - resolution);
-                if(cdistance < distance){
-                    idx = c;
-                    distance = cdistance;
-                }
-            }
-            resolution = acceptedSizes[idx];
-
+            resolution = Avatar.parseResolution(sizeArg.getAsInt());
         } else {
-            resolution = 512;
+            resolution = Avatar.parseResolution(512);
         }
 
-        EmbedBuilder embedBuilder = new EmbedBuilder();
-
-        // embed processing
-        {
-            embedBuilder.setColor(Cache.getBotColor());
-            embedBuilder.setTitle("Profile picture");
-
-            embedBuilder.addField("User", "<@" + user.getId() + ">", false);
-
-            embedBuilder.addField("Current resolution", resolution + " × " + resolution, false);
-
-            // string builder to create a string that links to all available resolutions
-            StringBuilder links = new StringBuilder();
-            for(int pos = 0; pos < acceptedSizes.length; pos++)
-            {
-                int currSize = acceptedSizes[pos];
-
-                String currLink = user.getEffectiveAvatar().getUrl(currSize);
-
-                links.append("[").append(currSize).append("px](").append(currLink).append(")");
-                if(pos + 1 != acceptedSizes.length) // don't add a separator on the last iteration
-                {
-                    links.append(" | ");
-                }
-            }
-
-            embedBuilder.addField("Available resolutions", links.toString(), false);
-
-
-
-            embedBuilder.setImage(user.getEffectiveAvatar().getUrl(resolution));
-        }
-
-        event.getHook().editOriginalEmbeds(embedBuilder.build()).queue();
+        MessageEmbed embed = Avatar.buildEmbed(resolution, user);
+        event.getHook().editOriginalEmbeds(embed).queue();
     }
 }

src/main/java/wtf/beatrice/hidekobot/commands/slash/ClearCommand.java

@@ -44,6 +44,9 @@ public class ClearCommand extends SlashCommandImpl
         OptionMapping amountOption = event.getOption("amount");
         int toDeleteAmount = amountOption == null ? 1 : amountOption.getAsInt();
 
+        // cap the amount to avoid abuse.
+        if(toDeleteAmount > ClearChat.getMaxAmount()) toDeleteAmount = 0;
+
         error = ClearChat.checkDeleteAmount(toDeleteAmount);
         if(error != null)
         {

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

@@ -0,0 +1,49 @@
+package wtf.beatrice.hidekobot.commands.slash;
+
+import net.dv8tion.jda.api.entities.MessageEmbed;
+import net.dv8tion.jda.api.events.interaction.command.SlashCommandInteractionEvent;
+import net.dv8tion.jda.api.interactions.commands.OptionMapping;
+import net.dv8tion.jda.api.interactions.commands.OptionType;
+import net.dv8tion.jda.api.interactions.commands.build.CommandData;
+import net.dv8tion.jda.api.interactions.commands.build.Commands;
+import org.jetbrains.annotations.NotNull;
+import wtf.beatrice.hidekobot.commands.base.MagicBall;
+import wtf.beatrice.hidekobot.objects.commands.SlashCommandImpl;
+
+public class MagicBallCommand extends SlashCommandImpl
+{
+    @Override
+    public CommandData getSlashCommandData()
+    {
+
+        return Commands.slash(MagicBall.getLabels().get(0),
+                "Ask a question to the magic ball.")
+                .addOption(OptionType.STRING, "question",
+                        "The question to ask.",
+                        true,
+                        false);
+    }
+
+    @Override
+    public void runSlashCommand(@NotNull SlashCommandInteractionEvent event)
+    {
+        // get the asked question
+        OptionMapping textOption = event.getOption("question");
+        String question = "";
+        if(textOption != null)
+        {
+            question = textOption.getAsString();
+        }
+
+        if(textOption == null || question.isEmpty())
+        {
+            event.reply("\uD83D\uDE20 Hey, you have to ask me a question!")
+                    .setEphemeral(true)
+                    .queue();
+            return;
+        }
+
+        MessageEmbed response = MagicBall.generateEmbed(question, event.getUser());
+        event.replyEmbeds(response).queue();
+    }
+}

src/main/java/wtf/beatrice/hidekobot/commands/slash/SayCommand.java

@@ -1,6 +1,5 @@
 package wtf.beatrice.hidekobot.commands.slash;
 
-import net.dv8tion.jda.api.Permission;
 import net.dv8tion.jda.api.entities.channel.middleman.MessageChannel;
 import net.dv8tion.jda.api.events.interaction.command.SlashCommandInteractionEvent;
 import net.dv8tion.jda.api.interactions.commands.DefaultMemberPermissions;
@@ -9,6 +8,7 @@ import net.dv8tion.jda.api.interactions.commands.OptionType;
 import net.dv8tion.jda.api.interactions.commands.build.CommandData;
 import net.dv8tion.jda.api.interactions.commands.build.Commands;
 import org.jetbrains.annotations.NotNull;
+import wtf.beatrice.hidekobot.commands.base.Say;
 import wtf.beatrice.hidekobot.objects.commands.SlashCommandImpl;
 
 public class SayCommand extends SlashCommandImpl
@@ -22,7 +22,7 @@ public class SayCommand extends SlashCommandImpl
                         "The message to send.",
                         true,
                         false)
-                .setDefaultPermissions(DefaultMemberPermissions.enabledFor(Permission.MESSAGE_MANAGE));
+                .setDefaultPermissions(DefaultMemberPermissions.enabledFor(Say.getPermission()));
     }
 
     @Override

src/main/java/wtf/beatrice/hidekobot/commands/slash/UrbanDictionaryCommand.java

@@ -0,0 +1,81 @@
+package wtf.beatrice.hidekobot.commands.slash;
+
+import net.dv8tion.jda.api.entities.MessageEmbed;
+import net.dv8tion.jda.api.events.interaction.command.SlashCommandInteractionEvent;
+import net.dv8tion.jda.api.interactions.commands.OptionMapping;
+import net.dv8tion.jda.api.interactions.commands.OptionType;
+import net.dv8tion.jda.api.interactions.commands.build.CommandData;
+import net.dv8tion.jda.api.interactions.commands.build.Commands;
+import net.dv8tion.jda.api.interactions.components.ActionRow;
+import net.dv8tion.jda.api.interactions.components.buttons.Button;
+import org.jetbrains.annotations.NotNull;
+import org.jsoup.Jsoup;
+import org.jsoup.nodes.Document;
+import org.jsoup.select.Elements;
+import wtf.beatrice.hidekobot.commands.base.UrbanDictionary;
+import wtf.beatrice.hidekobot.objects.commands.SlashCommandImpl;
+
+import java.io.IOException;
+
+public class UrbanDictionaryCommand extends SlashCommandImpl
+{
+    @Override
+    public CommandData getSlashCommandData()
+    {
+
+        return Commands.slash(UrbanDictionary.getCommandLabels().get(0),
+                "Look up a term on Urban Dictionary.")
+                .addOption(OptionType.STRING, "term", "The term to look up", true);
+    }
+
+    @Override
+    public void runSlashCommand(@NotNull SlashCommandInteractionEvent event)
+    {
+        event.deferReply().queue();
+
+        // get the term to look up
+        OptionMapping textOption = event.getOption("term");
+        String term = "";
+        if(textOption != null)
+        {
+            term = textOption.getAsString();
+        }
+
+        if(textOption == null || term.isEmpty())
+        {
+            event.reply(UrbanDictionary.getNoArgsError())
+                    .setEphemeral(true)
+                    .queue();
+            return;
+        }
+
+        final String sanitizedTerm = UrbanDictionary.sanitizeArgs(term, false);
+        String url = UrbanDictionary.generateUrl(sanitizedTerm);
+
+        Document doc;
+
+        try {
+            doc = Jsoup.connect(url).get();
+        } catch (IOException e) {
+            event.reply(UrbanDictionary.getTermNotFoundError())
+                    .setEphemeral(true)
+                    .queue();
+            return;
+        }
+
+        Elements definitions = doc.getElementsByClass("definition");
+        UrbanDictionary.UrbanSearch search = new UrbanDictionary.UrbanSearch(definitions);
+        MessageEmbed embed = UrbanDictionary.buildEmbed(sanitizedTerm, url, event.getUser(), search, 0);
+
+        // disable next page if we only have one result
+        Button nextPageBtnLocal = UrbanDictionary.getNextPageButton();
+        if(search.getPages() == 1) nextPageBtnLocal = nextPageBtnLocal.asDisabled();
+
+        ActionRow actionRow = ActionRow.of(UrbanDictionary.getPreviousPageButton().asDisabled(),
+                //disabled by default because we're on page 0
+                nextPageBtnLocal,
+                UrbanDictionary.getDeleteButton());
+        event.getHook().editOriginalEmbeds(embed).setComponents(actionRow).queue(message ->
+                UrbanDictionary.track(message, event.getUser(), search, sanitizedTerm));
+    }
+}

src/main/java/wtf/beatrice/hidekobot/datasources/DatabaseSource.java

@@ -81,6 +81,12 @@ public class DatabaseSource
      * | 39402849302   | 39402849302        | 39402849302      | 39402849302    | PRIVATE         |
      * --------------------------------------------------------------------------------------------
      *
+     * TABLE 3: urban_dictionary
+     * -----------------------------------------------------------------------------------------------------
+     * | message_id    | page      | meanings    | examples    | contributors      | dates      | term     |
+     * -----------------------------------------------------------------------------------------------------
+     * | 39402849302   | 0         | base64      | base64      | base64            | base64     | miku     |
+     * -----------------------------------------------------------------------------------------------------
      */
 
     //todo: javadocs
@@ -104,6 +110,16 @@ public class DatabaseSource
                 "channel_type TEXT NOT NULL" + // channel type (PRIVATE, FORUM, ...)
                 ");");
 
+        newTables.add("CREATE TABLE IF NOT EXISTS urban_dictionary (" +
+                "message_id TEXT NOT NULL, " + // message id of the bot's response
+                "page INTEGER NOT NULL," + // page that we are currently on
+                "meanings TEXT NOT NULL," + // list of all meanings, serialized and encoded
+                "examples TEXT NOT NULL, " + // list of all examples, serialized and encoded
+                "contributors TEXT NOT NULL, " + // list of all contributors, serialized and encoded
+                "dates TEXT NOT NULL, " + // list of all submission dates, serialized and encoded
+                "term TEXT NOT NULL" + // the term that was searched
+                ");");
+
         for(String sql : newTables)
         {
             try (Statement stmt = dbConnection.createStatement()) {
@@ -301,6 +317,17 @@ public class DatabaseSource
             return false;
         }
 
+        query = "DELETE FROM urban_dictionary WHERE message_id = ?;";
+        try(PreparedStatement preparedStatement = dbConnection.prepareStatement(query))
+        {
+            preparedStatement.setString(1, messageId);
+            preparedStatement.execute();
+        } catch (SQLException e)
+        {
+            e.printStackTrace();
+            return false;
+        }
+
         return true;
     }
 
@@ -373,5 +400,220 @@ public class DatabaseSource
         return null;
     }
 
+    public boolean trackUrban(String meanings, String examples,
+                              String contributors, String dates,
+                              Message message, String term)
+    {
+
+        String query = "INSERT INTO urban_dictionary " +
+                "(message_id, page, meanings, examples, contributors, dates, term) VALUES " +
+                " (?, ?, ?, ?, ?, ?, ?);";
+
+        try(PreparedStatement preparedStatement = dbConnection.prepareStatement(query))
+        {
+            preparedStatement.setString(1, message.getId());
+            preparedStatement.setInt(2, 0);
+            preparedStatement.setString(3, meanings);
+            preparedStatement.setString(4, examples);
+            preparedStatement.setString(5, contributors);
+            preparedStatement.setString(6, dates);
+            preparedStatement.setString(7, term);
+
+            preparedStatement.executeUpdate();
+
+            return true;
+        } catch (SQLException e)
+        {
+            e.printStackTrace();
+        }
+
+        return false;
+    }
+
+    public int getUrbanPage(String messageId)
+    {
+        String query = "SELECT page " +
+                "FROM urban_dictionary " +
+                "WHERE message_id = ?;";
+
+        try(PreparedStatement preparedStatement = dbConnection.prepareStatement(query))
+        {
+            preparedStatement.setString(1, messageId);
+            ResultSet resultSet = preparedStatement.executeQuery();
+            if(resultSet.isClosed()) return 0;
+            while(resultSet.next())
+            {
+                return resultSet.getInt("page");
+            }
+
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+
+        return 0;
+    }
+
+    public String getUrbanMeanings(String messageId)
+    {
+        String query = "SELECT meanings " +
+                "FROM urban_dictionary " +
+                "WHERE message_id = ?;";
+
+        try(PreparedStatement preparedStatement = dbConnection.prepareStatement(query))
+        {
+            preparedStatement.setString(1, messageId);
+            ResultSet resultSet = preparedStatement.executeQuery();
+            if(resultSet.isClosed()) return null;
+            while(resultSet.next())
+            {
+                return resultSet.getString("meanings");
+            }
+
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+
+        return null;
+    }
+
+    public String getUrbanExamples(String messageId)
+    {
+        String query = "SELECT examples " +
+                "FROM urban_dictionary " +
+                "WHERE message_id = ?;";
+
+        try(PreparedStatement preparedStatement = dbConnection.prepareStatement(query))
+        {
+            preparedStatement.setString(1, messageId);
+            ResultSet resultSet = preparedStatement.executeQuery();
+            if(resultSet.isClosed()) return null;
+            while(resultSet.next())
+            {
+                return resultSet.getString("examples");
+            }
+
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+
+        return null;
+    }
+
+    public String getUrbanContributors(String messageId)
+    {
+        String query = "SELECT contributors " +
+                "FROM urban_dictionary " +
+                "WHERE message_id = ?;";
+
+        try(PreparedStatement preparedStatement = dbConnection.prepareStatement(query))
+        {
+            preparedStatement.setString(1, messageId);
+            ResultSet resultSet = preparedStatement.executeQuery();
+            if(resultSet.isClosed()) return null;
+            while(resultSet.next())
+            {
+                return resultSet.getString("contributors");
+            }
+
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+
+        return null;
+    }
+
+    public String getUrbanDates(String messageId)
+    {
+        String query = "SELECT dates " +
+                "FROM urban_dictionary " +
+                "WHERE message_id = ?;";
+
+        try(PreparedStatement preparedStatement = dbConnection.prepareStatement(query))
+        {
+            preparedStatement.setString(1, messageId);
+            ResultSet resultSet = preparedStatement.executeQuery();
+            if(resultSet.isClosed()) return null;
+            while(resultSet.next())
+            {
+                return resultSet.getString("dates");
+            }
+
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+
+        return null;
+    }
+
+    public String getUrbanTerm(String messageId)
+    {
+        String query = "SELECT term " +
+                "FROM urban_dictionary " +
+                "WHERE message_id = ?;";
+
+        try(PreparedStatement preparedStatement = dbConnection.prepareStatement(query))
+        {
+            preparedStatement.setString(1, messageId);
+            ResultSet resultSet = preparedStatement.executeQuery();
+            if(resultSet.isClosed()) return null;
+            while(resultSet.next())
+            {
+                return resultSet.getString("term");
+            }
+
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+
+        return null;
+    }
+
+    public boolean setUrbanPage(String messageId, int page)
+    {
+        String query = "UPDATE urban_dictionary " +
+                "SET page = ? " +
+                "WHERE message_id = ?;";
+
+        try(PreparedStatement preparedStatement = dbConnection.prepareStatement(query))
+        {
+            preparedStatement.setInt(1, page);
+            preparedStatement.setString(2, messageId);
+            preparedStatement.executeUpdate();
+
+            return true;
+
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+
+        return false;
+    }
+
+    public boolean resetExpiryTimestamp(String messageId)
+    {
+        LocalDateTime expiryTime = LocalDateTime.now().plusSeconds(Cache.getExpiryTimeSeconds());
+
+        DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(Cache.getExpiryTimestampFormat());
+        String expiryTimeFormatted = dateTimeFormatter.format(expiryTime);
+
+        String query = "UPDATE pending_disabled_messages " +
+                "SET expiry_timestamp = ? " +
+                "WHERE message_id = ?;";
+
+        try(PreparedStatement preparedStatement = dbConnection.prepareStatement(query))
+        {
+            preparedStatement.setString(1, expiryTimeFormatted);
+            preparedStatement.setString(2, messageId);
+            preparedStatement.executeUpdate();
+
+            return true;
+
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+
+        return false;
+    }
+
 
 }

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

@@ -2,8 +2,9 @@ package wtf.beatrice.hidekobot.listeners;
 
 import net.dv8tion.jda.api.events.interaction.component.ButtonInteractionEvent;
 import net.dv8tion.jda.api.hooks.ListenerAdapter;
-import wtf.beatrice.hidekobot.commands.base.ClearChat;
 import wtf.beatrice.hidekobot.commands.base.CoinFlip;
+import wtf.beatrice.hidekobot.commands.base.UrbanDictionary;
+import wtf.beatrice.hidekobot.util.CommandUtil;
 
 public class ButtonInteractionListener extends ListenerAdapter
 {
@@ -17,8 +18,12 @@ public class ButtonInteractionListener extends ListenerAdapter
             // coinflip
             case "coinflip_reflip" -> CoinFlip.buttonReFlip(event);
 
-            // clearchat command
-            case "clear_dismiss" -> ClearChat.dismissMessage(event);
+            // generic dismiss button
+            case "generic_dismiss" -> CommandUtil.delete(event);
+
+            // urban dictionary navigation
+            case "urban_nextpage" -> UrbanDictionary.changePage(event, UrbanDictionary.ChangeType.NEXT);
+            case "urban_previouspage" -> UrbanDictionary.changePage(event, UrbanDictionary.ChangeType.PREVIOUS);
 
         }
 

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

@@ -7,14 +7,13 @@ import net.dv8tion.jda.api.entities.channel.middleman.GuildChannel;
 import net.dv8tion.jda.api.events.message.MessageReceivedEvent;
 import net.dv8tion.jda.api.hooks.ListenerAdapter;
 import org.jetbrains.annotations.NotNull;
+import wtf.beatrice.hidekobot.Cache;
+import wtf.beatrice.hidekobot.objects.commands.CommandCategory;
 import wtf.beatrice.hidekobot.objects.commands.MessageCommand;
 import wtf.beatrice.hidekobot.objects.comparators.MessageCommandAliasesComparator;
 import wtf.beatrice.hidekobot.util.Logger;
 
-import java.util.Arrays;
-import java.util.LinkedList;
-import java.util.List;
-import java.util.TreeMap;
+import java.util.*;
 
 public class MessageCommandListener extends ListenerAdapter
 {
@@ -23,6 +22,10 @@ public class MessageCommandListener extends ListenerAdapter
     private final TreeMap<LinkedList<String>, MessageCommand> registeredCommands =
             new TreeMap<LinkedList<String>, MessageCommand>(new MessageCommandAliasesComparator());
 
+    // map commands and their categories.
+    // this is not strictly needed but it's better to have it so we avoid looping every time we need to check the cat.
+    LinkedHashMap<CommandCategory, LinkedList<MessageCommand>> commandCategories = new LinkedHashMap<>();
+
     private final String commandRegex = "(?i)^(hideko|hde)\\b";
     // (?i) -> case insensitive flag
     // ^ -> start of string (not in middle of a sentence)
@@ -57,10 +60,14 @@ public class MessageCommandListener extends ListenerAdapter
     @Override
     public void onMessageReceived(@NotNull MessageReceivedEvent event)
     {
-        String eventMessage = event.getMessage().getContentDisplay();
+        // check if a bot is sending this message, and ignore it
+        if(event.getAuthor().isBot()) return;
+
+        // warning: we are getting the RAW value of the message content, not the DISPLAY value!
+        String eventMessage = event.getMessage().getContentRaw();
 
         // check if the sent message matches the bot activation regex (prefix, name, ...)
-        if(!eventMessage.toLowerCase().matches(commandRegex + ".*"))
+        if(!eventMessage.toLowerCase().matches(commandRegex + "((.|\\n)*)"))
             return;
 
         // generate args from the string
@@ -74,7 +81,9 @@ public class MessageCommandListener extends ListenerAdapter
         // it will be the whole text as a single element.
         if(argsString.isEmpty())
         {
-            event.getMessage().reply("Hello there! ✨").queue();
+            event.getMessage()
+                    .reply("Hello there! ✨ Type `" + Cache.getBotPrefix() + " help` to get started!")
+                    .queue();
             return;
         }
 
@@ -87,7 +96,11 @@ public class MessageCommandListener extends ListenerAdapter
 
         if(commandObject == null)
         {
+            /* temporarily disabled because when people talk about the bot, it replies with this spammy message.
+
             event.getMessage().reply("Unrecognized command: `" + commandLabel + "`!").queue(); // todo prettier
+
+            */
             return;
         }
 
@@ -120,8 +133,9 @@ public class MessageCommandListener extends ListenerAdapter
         String[] commandArgs;
         if(commandObject.passRawArgs())
         {
+
             // remove first argument, which is the command label
-            argsString = argsString.replaceAll("^[\\S]+\\s+", "");
+            argsString = argsString.replaceAll("^[\\S]+\\s*", "");
             // pass all other arguments as a single argument as the first array element
             commandArgs = new String[]{argsString};
         }

src/main/java/wtf/beatrice/hidekobot/objects/Dice.java

@@ -0,0 +1,45 @@
+package wtf.beatrice.hidekobot.objects;
+
+import wtf.beatrice.hidekobot.util.RandomUtil;
+
+import java.util.UUID;
+
+public class Dice
+{
+    private final int sides;
+    private int value = 0;
+    private final UUID uuid;
+
+    public Dice(int sides)
+    {
+        this.sides = sides;
+        this.uuid = UUID.randomUUID();
+    }
+
+    public Dice(Dice old)
+    {
+        this.sides = old.sides;
+        this.value = old.value;
+        this.uuid = UUID.randomUUID();
+    }
+
+    public int getValue()
+    {
+        return value;
+    }
+
+    public int getSides()
+    {
+        return sides;
+    }
+
+    public void roll()
+    {
+        value = RandomUtil.getRandomNumber(1, sides);
+    }
+
+    public UUID getUUID()
+    {
+        return uuid;
+    }
+}

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

@@ -0,0 +1,18 @@
+package wtf.beatrice.hidekobot.objects.commands;
+
+public enum CommandCategory
+{
+    MODERATION("️\uD83D\uDC40"),
+    FUN("\uD83C\uDFB2"),
+    TOOLS("\uD83D\uDEE0"),
+
+    ;
+
+    private String emoji;
+    CommandCategory(String emoji)
+    {
+        this.emoji = emoji;
+    }
+
+    public String getEmoji() { return emoji; }
+}

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

@@ -2,6 +2,7 @@ package wtf.beatrice.hidekobot.objects.commands;
 
 import net.dv8tion.jda.api.Permission;
 import net.dv8tion.jda.api.events.message.MessageReceivedEvent;
+import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
 import java.util.LinkedList;
@@ -39,6 +40,31 @@ public interface MessageCommand
      */
     boolean passRawArgs();
 
+    /**
+     * Say what category this command belongs to.
+     *
+     * @return the command category.
+     */
+    @NotNull
+    CommandCategory getCategory();
+
+    /**
+     * Say what this command does.
+     *
+     * @return a String explaining what this command does.
+     */
+    @NotNull
+    String getDescription();
+
+    /**
+     * Say how people should use this command.
+     *
+     * @return a String explaining how to use the command, excluding the bot prefix and command name. Null if no parameter is needed
+     */
+    @Nullable
+    String getUsage();
+
+
     /**
      * Run the command logic by parsing the event and replying accordingly.
      *

src/main/java/wtf/beatrice/hidekobot/runnables/RandomSeedTask.java

@@ -0,0 +1,12 @@
+package wtf.beatrice.hidekobot.runnables;
+
+import wtf.beatrice.hidekobot.Cache;
+
+public class RandomSeedTask implements Runnable
+{
+
+    @Override
+    public void run() {
+        Cache.setRandomSeed(System.currentTimeMillis());
+    }
+}

src/main/java/wtf/beatrice/hidekobot/runnables/StatusUpdateTask.java

@@ -0,0 +1,30 @@
+package wtf.beatrice.hidekobot.runnables;
+
+import net.dv8tion.jda.api.entities.Activity;
+import wtf.beatrice.hidekobot.Cache;
+import wtf.beatrice.hidekobot.HidekoBot;
+import wtf.beatrice.hidekobot.util.RandomUtil;
+
+import java.util.Arrays;
+import java.util.List;
+
+public class StatusUpdateTask implements Runnable
+{
+
+    List<String> statuses = Arrays.asList(
+            "Hatsune Miku: Project DIVA",
+            "Wii Sports",
+            "Excel",
+            "Mii Channel",
+            "Wii Speak",
+            "MineTest",
+            "Mario Kart Wii"
+    );
+
+    @Override
+    public void run() {
+        int randomPos = RandomUtil.getRandomNumber(0, statuses.size() - 1);
+        String status = statuses.get(randomPos) + " | " + Cache.getBotPrefix() + " help";
+        HidekoBot.getAPI().getPresence().setActivity(Activity.playing(status));
+    }
+}

src/main/java/wtf/beatrice/hidekobot/util/CommandUtil.java

@@ -1,21 +1,48 @@
 package wtf.beatrice.hidekobot.util;
 
 import net.dv8tion.jda.api.JDA;
+import net.dv8tion.jda.api.events.interaction.component.ButtonInteractionEvent;
 import net.dv8tion.jda.api.interactions.commands.Command;
 import net.dv8tion.jda.api.interactions.commands.build.CommandData;
 import wtf.beatrice.hidekobot.Cache;
 import wtf.beatrice.hidekobot.HidekoBot;
-import wtf.beatrice.hidekobot.listeners.MessageCommandListener;
 import wtf.beatrice.hidekobot.objects.commands.SlashCommand;
 
 import java.util.ArrayList;
 import java.util.List;
 
-public class SlashCommandUtil
+public class CommandUtil
 {
 
-    private static final Logger logger = new Logger(MessageCommandListener.class);
+    private static final Logger logger = new Logger(CommandUtil.class);
 
+    /**
+     * Function to delete a message when a user clicks the "delete" button attached to that message.
+     * This will check in the database if that user ran the command originally.
+     *
+     * @param event the button interaction event.
+     */
+    public static void delete(ButtonInteractionEvent event)
+    {
+        // check if the user interacting is the same one who ran the command
+        if (!(Cache.getDatabaseSource().isUserTrackedFor(event.getUser().getId(), event.getMessageId()))) {
+            event.reply("❌ You did not run this command!").setEphemeral(true).queue();
+            return;
+        }
+
+        // delete the message
+        event.getInteraction().getMessage().delete().queue();
+        // no need to manually untrack it from database, it will be purged on the next planned check.
+    }
+
+
+    /**
+     * Method to update slash commands registered on Discord's side.
+     * It runs automatically every time the bot starts, but only updates the commands in case differences
+     * are found, unless forced.
+     *
+     * @param force a boolean specifying if the update should be forced even if no differences were found.
+     */
     public static void updateSlashCommands(boolean force)
     {
 

src/main/java/wtf/beatrice/hidekobot/util/RandomUtil.java

@@ -1,12 +1,11 @@
 package wtf.beatrice.hidekobot.util;
 
+import wtf.beatrice.hidekobot.Cache;
+
 import java.util.Random;
 
 public class RandomUtil
 {
-    private static final Random random = new Random();
-
-
     /**
      * Returns a random integer picked in a range.
      *
@@ -29,7 +28,7 @@ public class RandomUtil
         int difference = (max - min) + 1;
 
         // find a number between 0 and our range (eg. 5 -> 8 = 0 -> 3)
-        int randomTemp = random.nextInt(difference);
+        int randomTemp = Cache.getRandom().nextInt(difference);
 
         // add the minimum value, so we are sure to be in the original range (0->5, 1->6, 2->7, 3->8)
         return randomTemp + min;

src/main/java/wtf/beatrice/hidekobot/util/SerializationUtil.java

@@ -0,0 +1,39 @@
+package wtf.beatrice.hidekobot.util;
+
+import org.apache.commons.lang3.SerializationException;
+
+import java.io.*;
+import java.util.Base64;
+import java.util.LinkedList;
+import java.util.List;
+
+public class SerializationUtil
+{
+
+    public static String serializeBase64(List dataList) {
+
+        try (ByteArrayOutputStream bo = new ByteArrayOutputStream();
+             ObjectOutputStream so = new ObjectOutputStream(bo)) {
+            so.writeObject(dataList);
+            so.flush();
+            return Base64.getEncoder().encodeToString(bo.toByteArray());
+        }
+        catch (IOException e) {
+            throw new SerializationException("Error during serialization", e);
+        }
+    }
+
+    public static LinkedList deserializeBase64(String dataStr) {
+
+        byte[] b = Base64.getDecoder().decode(dataStr);
+        ByteArrayInputStream bi = new ByteArrayInputStream(b);
+        ObjectInputStream si;
+        try {
+            si = new ObjectInputStream(bi);
+            return LinkedList.class.cast(si.readObject());
+        }
+        catch (IOException | ClassNotFoundException e) {
+            throw new SerializationException("Error during deserialization", e);
+        }
+    }
+}