net.dv8tion.jda.internal.handle.MessageDeleteHandler Maven / Gradle / Ivy

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/*
 * Copyright 2015 Austin Keener, Michael Ritter, Florian Spieß, and the JDA contributors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package net.dv8tion.jda.internal.handle;

import net.dv8tion.jda.api.entities.Guild;
import net.dv8tion.jda.api.entities.channel.middleman.GuildChannel;
import net.dv8tion.jda.api.entities.channel.middleman.MessageChannel;
import net.dv8tion.jda.api.events.message.MessageDeleteEvent;
import net.dv8tion.jda.api.utils.data.DataObject;
import net.dv8tion.jda.internal.JDAImpl;
import net.dv8tion.jda.internal.entities.channel.concrete.ThreadChannelImpl;
import net.dv8tion.jda.internal.requests.WebSocketClient;

public class MessageDeleteHandler extends SocketHandler
{

    public MessageDeleteHandler(JDAImpl api)
    {
        super(api);
    }

    @Override
    protected Long handleInternally(DataObject content)
    {
        Guild guild = null;
        if (!content.isNull("guild_id"))
        {
            long guildId = content.getLong("guild_id");
            if (getJDA().getGuildSetupController().isLocked(guildId))
                return guildId;

            guild = getJDA().getGuildById(guildId);
            if (guild == null)
            {
                getJDA().getEventCache().cache(EventCache.Type.GUILD, guildId, responseNumber, allContent, this::handle);
                EventCache.LOG.debug("Got message delete for a guild that is not yet cached. GuildId: {}", guildId);
                return null;
            }
        }

        final long messageId = content.getLong("id");
        final long channelId = content.getLong("channel_id");

        MessageChannel channel = getJDA().getChannelById(MessageChannel.class, channelId);
        if (channel == null)
        {
            // If discord adds message support for unexpected types in the future, drop the event instead of caching it
            if (guild != null)
            {
                GuildChannel actual = guild.getGuildChannelById(channelId);
                if (actual != null)
                {
                    WebSocketClient.LOG.debug("Dropping MESSAGE_DELETE for unexpected channel of type {}", actual.getType());
                    return null;
                }
            }

            getJDA().getEventCache().cache(EventCache.Type.CHANNEL, channelId, responseNumber, allContent, this::handle);
            EventCache.LOG.debug("Got message delete for a channel/group that is not yet cached. ChannelId: {}", channelId);
            return null;
        }

        if (channel.getType().isThread())
        {
            ThreadChannelImpl gThread = (ThreadChannelImpl) channel;

            gThread.setMessageCount(Math.max(0, gThread.getMessageCount() - 1));
            // Not decrementing totalMessageCount since that should include deleted as well
        }

        getJDA().handleEvent(new MessageDeleteEvent(getJDA(), responseNumber, messageId, channel));
        return null;
    }
}