/*
 * This file is part of LanternServer, licensed under the MIT License (MIT).
 *
 * Copyright (c) LanternPowered <https://www.lanternpowered.org>
 * Copyright (c) SpongePowered <https://www.spongepowered.org>
 * Copyright (c) contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the Software), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED AS IS, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package org.lanternpowered.server.network.vanilla.message.processor.play;

import com.google.common.collect.HashMultimap;
import com.google.common.collect.Multimap;
import io.netty.handler.codec.CodecException;
import org.lanternpowered.server.network.message.Message;
import org.lanternpowered.server.network.message.codec.CodecContext;
import org.lanternpowered.server.network.message.processor.Processor;
import org.lanternpowered.server.network.vanilla.message.type.play.MessagePlayOutTabListEntries;
import org.lanternpowered.server.network.vanilla.message.type.play.MessagePlayOutTabListEntries.Entry;

import java.util.Collection;
import java.util.List;

/**
 * This processor will separate the entries with different types and put them
 * into a new message, this is required because the vanilla codec can only use
 * one entry type for one message.
 */
public final class ProcessorPlayOutTabListEntries implements Processor<MessagePlayOutTabListEntries> {

    @Override
    public void process(CodecContext context, MessagePlayOutTabListEntries message, List<Message> output) throws CodecException {
        final Multimap<Class<?>, Entry> entriesByType = HashMultimap.create();
        for (Entry entry : message.getEntries()) {
            entriesByType.put(entry.getClass(), entry);
        }
        if (entriesByType.isEmpty()) {
            return;
        }
        if (entriesByType.keySet().size() == 1) {
            output.add(message);
        } else {
            for (java.util.Map.Entry<Class<?>, Collection<Entry>> en : entriesByType.asMap().entrySet()) {
                output.add(new MessagePlayOutTabListEntries(en.getValue()));
            }
        }
    }
}