From f2dc70569dff497b039d481d7d6797f8754a633b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Beatrice=20Dellac=C3=A0?= <hello@beatrice.wtf>
Date: Sun, 20 Nov 2022 03:41:51 +0100
Subject: [PATCH] Implement basic clear-chat slash command

---
 .../listeners/SlashCommandListener.java       | 40 ++++++++++++++++++-
 1 file changed, 39 insertions(+), 1 deletion(-)

diff --git a/src/main/java/wtf/beatrice/hidekobot/listeners/SlashCommandListener.java b/src/main/java/wtf/beatrice/hidekobot/listeners/SlashCommandListener.java
index c055133..beecaa9 100644
--- a/src/main/java/wtf/beatrice/hidekobot/listeners/SlashCommandListener.java
+++ b/src/main/java/wtf/beatrice/hidekobot/listeners/SlashCommandListener.java
@@ -1,10 +1,17 @@
 package wtf.beatrice.hidekobot.listeners;
 
+import net.dv8tion.jda.api.entities.Message;
+import net.dv8tion.jda.api.entities.MessageChannel;
+import net.dv8tion.jda.api.entities.MessageHistory;
+import net.dv8tion.jda.api.entities.TextChannel;
 import net.dv8tion.jda.api.events.interaction.command.SlashCommandInteractionEvent;
 import net.dv8tion.jda.api.hooks.ListenerAdapter;
 import org.jetbrains.annotations.NotNull;
 import wtf.beatrice.hidekobot.utils.RandomUtil;
 
+import java.util.ArrayList;
+import java.util.List;
+
 public class SlashCommandListener extends ListenerAdapter
 {
 
@@ -14,7 +21,9 @@ public class SlashCommandListener extends ListenerAdapter
         if (event.getName().equals("ping"))
         {
             event.reply("Pong!").queue();
-        } else if (event.getName().equals("coinflip"))
+        }
+
+        else if (event.getName().equals("coinflip"))
         {
             int rand = RandomUtil.getRandomNumber(0, 1);
             String msg;
@@ -29,5 +38,34 @@ public class SlashCommandListener extends ListenerAdapter
             event.reply(msg).queue();
         }
 
+
+        else if (event.getName().equals("clear"))
+        {
+            MessageChannel channel = event.getChannel();
+
+            if(!(channel instanceof TextChannel))
+            {
+                event.reply("Sorry! I can't delete messages here.").queue();
+                return;
+            }
+
+            int deleteCount = event.getOption("amount").getAsInt();
+            if(deleteCount < 2 || deleteCount > 98)
+            {
+                event.reply("Sorry! I can't delete that amount of messages!").queue();
+                return;
+            }
+
+            event.reply("Clearing...").queue();
+
+            MessageHistory.MessageRetrieveAction action = channel.getHistoryBefore(event.getInteraction().getIdLong(), deleteCount);
+            List<Message> messagesUnmodifiable = action.complete().getRetrievedHistory();
+            List<Message> messages = new ArrayList<>(messagesUnmodifiable);
+
+            //more than 2 messages, less than 100 for this method
+            ((TextChannel) channel).deleteMessages(messages).queue();
+
+        }
+
     }
 }