impl purge command

src/main/java/cc/fascinated/bat/command/Category.java

@@ -16,9 +16,10 @@ public enum Category {
     GENERAL(Emoji.fromUnicode("U+2699"), "General", false),
     FUN(Emoji.fromFormatted("U+1F973"), "Fun", false),
     SERVER(Emoji.fromFormatted("U+1F5A5"), "Server", false),
+    MODERATION(Emoji.fromFormatted("U+1F6E0"), "Moderation", false),
     UTILITY(Emoji.fromFormatted("U+1F6E0"), "Utility", false),
     MUSIC(Emoji.fromFormatted("U+1F3B5"), "Music", false),
-    SNIPE(Emoji.fromFormatted("U+1F4A3"), "Snipe", false),
+    MESSAGES(Emoji.fromFormatted("U+1F4A3"), "Snipe", false),
     LOGS(Emoji.fromFormatted("U+1F4D1"), "Logs", false),
     BEAT_SABER(Emoji.fromFormatted("U+1FA84"), "Beat Saber", false),
     BOT_ADMIN(null, null, true);

src/main/java/cc/fascinated/bat/features/logging/listeners/MessageListener.java

@@ -31,7 +31,7 @@ public class MessageListener implements EventListener {
 
     @Override
     public void onGuildMessageDelete(@NonNull BatGuild guild, BatUser user, DiscordMessage message, @NonNull MessageDeleteEvent event) {
-        if (user.getDiscordUser().isBot() || message.getAuthor().isBot()) return;
+        if (user == null || user.getDiscordUser().isBot() || message.getAuthor().isBot()) return;
         log.info("User \"{}\" deleted a message in guild \"{}\"", user.getDiscordUser().getGlobalName(), guild.getName());
 
         logFeature.sendLog(guild, LogType.MESSAGE_DELETE, EmbedUtils.errorEmbed()

src/main/java/cc/fascinated/bat/features/messagesnipe/MessageSnipeFeature.java

@@ -30,7 +30,7 @@ public class MessageSnipeFeature extends Feature implements EventListener {
 
     @Autowired
     public MessageSnipeFeature(@NonNull ApplicationContext context, @NonNull CommandService commandService) {
-        super("Message Snipe", false, Category.SNIPE);
+        super("Message Snipe", false, Category.MESSAGES);
 
         super.registerCommand(commandService, context.getBean(MessageSnipeCommand.class));
     }

src/main/java/cc/fascinated/bat/features/moderation/ModerationFeature.java

@@ -0,0 +1,23 @@
+package cc.fascinated.bat.features.moderation;
+
+import cc.fascinated.bat.command.Category;
+import cc.fascinated.bat.features.Feature;
+import cc.fascinated.bat.features.moderation.command.PurgeCommand;
+import cc.fascinated.bat.service.CommandService;
+import lombok.NonNull;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.ApplicationContext;
+import org.springframework.stereotype.Component;
+
+/**
+ * @author Fascinated (fascinated7)
+ */
+@Component
+public class ModerationFeature extends Feature {
+    @Autowired
+    public ModerationFeature(@NonNull ApplicationContext context, @NonNull CommandService commandService) {
+        super("Moderation", true,Category.MODERATION);
+
+        super.registerCommand(commandService, context.getBean(PurgeCommand.class));
+    }
+}

src/main/java/cc/fascinated/bat/features/moderation/command/PurgeCommand.java

@@ -0,0 +1,67 @@
+package cc.fascinated.bat.features.moderation.command;
+
+import cc.fascinated.bat.command.BatCommand;
+import cc.fascinated.bat.command.CommandInfo;
+import cc.fascinated.bat.common.EmbedUtils;
+import cc.fascinated.bat.model.BatGuild;
+import cc.fascinated.bat.model.BatUser;
+import lombok.NonNull;
+import net.dv8tion.jda.api.Permission;
+import net.dv8tion.jda.api.entities.Member;
+import net.dv8tion.jda.api.entities.Message;
+import net.dv8tion.jda.api.entities.channel.concrete.TextChannel;
+import net.dv8tion.jda.api.entities.channel.middleman.MessageChannel;
+import net.dv8tion.jda.api.interactions.commands.OptionMapping;
+import net.dv8tion.jda.api.interactions.commands.OptionType;
+import net.dv8tion.jda.api.interactions.commands.SlashCommandInteraction;
+import org.springframework.stereotype.Component;
+
+import java.util.List;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * @author Fascinated (fascinated7)
+ */
+@Component
+@CommandInfo(name = "purge", description = "Purge messages from a channel", requiredPermissions = Permission.MESSAGE_MANAGE)
+public class PurgeCommand extends BatCommand {
+    private final long MESSAGE_DELETE_DELAY = TimeUnit.SECONDS.toMillis(10);
+
+    public PurgeCommand() {
+        super.addOption(OptionType.INTEGER, "amount", "The amount of messages to remove", true);
+    }
+
+    @Override
+    public void execute(BatGuild guild, @NonNull BatUser user, @NonNull MessageChannel channel, Member member, @NonNull SlashCommandInteraction event) {
+        OptionMapping amountOption = event.getOption("amount");
+        if (amountOption == null) {
+            return;
+        }
+        int amount = amountOption.getAsInt();
+        if (amount < 2 || amount > 100) {
+            event.replyEmbeds(EmbedUtils.errorEmbed()
+                    .setDescription("You can only purge between 2 and 100 messages")
+                    .build()).queue();
+            return;
+        }
+
+        event.replyEmbeds(EmbedUtils.successEmbed()
+                .setDescription("Purging `%s` messages...".formatted(amount))
+                .build()).queue(then -> {
+            TextChannel textChannel = (TextChannel) channel;
+            textChannel.getHistory().retrievePast(amount + 1).queue(messages -> {
+                // Filter out the command message
+                then.retrieveOriginal().queue(original -> {
+                    if (original == null) return;
+                    List<Message> toRemove = messages.stream().filter(message -> !original.getId().equals(message.getId())).toList();
+                    textChannel.deleteMessages(toRemove).queue(done -> then.editOriginalEmbeds(EmbedUtils.successEmbed()
+                            .setDescription("Successfully purged `%s` messages\n\n*This message will be removed <t:%s:R>*".formatted(
+                                    amount,
+                                    (System.currentTimeMillis() + MESSAGE_DELETE_DELAY) / 1000
+                            ))
+                            .build()).queue(message -> message.delete().queueAfter(MESSAGE_DELETE_DELAY, TimeUnit.MILLISECONDS)));
+                });
+            });
+        });
+    }
+}