minecraft-kajetans-mod/src/main/java/me/km/networking/PlayerHead.java

package me.km.networking;

import io.netty.buffer.ByteBuf;
import java.nio.charset.StandardCharsets;
import net.minecraft.client.Minecraft;
import net.minecraftforge.fml.common.network.simpleimpl.IMessage;
import net.minecraftforge.fml.common.network.simpleimpl.IMessageHandler;
import net.minecraftforge.fml.common.network.simpleimpl.MessageContext;

public class PlayerHead implements IMessage
{
    // 1 - add - index, name, x, y, scale
    // 2 - remove - index
    // 3 - clear
    private byte action;
    private byte index;
    private String name;
    private int x;
    private int y;
    private byte scale;
    
    public PlayerHead() 
    {
        action = -1;
        index = -1;
        name = "";
        x = -1;
        y = -1;
        scale = -1;
    }
    
    public PlayerHead(byte action, byte index, String name, int x, int y, byte scale) 
    {
        this.action = action;
        this.index = index;
        if(name.length() > 16)
        {
            this.name = name.substring(0, 16);
        }
        else
        {
            this.name = name;
        }
        this.x = x;
        this.y = y;
        this.scale = scale;
    }
    
    @Override
    public void fromBytes(ByteBuf buf) 
    {
        action = buf.readByte();
        switch(action)
        {
            case 1:
                x = buf.readInt();
                y = buf.readInt();
                scale = buf.readByte();
                index = buf.readByte();
                int length = buf.readInt();
                name = buf.readBytes(length).toString(StandardCharsets.UTF_8);
                break;
            case 2:
                index = buf.readByte();
                break;
        }
    }

    @Override
    public void toBytes(ByteBuf buf) 
    {
        buf.writeByte(action);
        switch(action)
        {
            case 1:
                buf.writeInt(x);
                buf.writeInt(y);
                buf.writeByte(scale);
                buf.writeByte(index);
                byte[] b = name.getBytes(StandardCharsets.UTF_8);
                buf.writeInt(b.length);
                buf.writeBytes(b);
                break;
            case 2:
                buf.writeByte(index);
                break;
        }
    }

    public static class Handler implements IMessageHandler<PlayerHead, IMessage>
    {
        @Override
        public IMessage onMessage(PlayerHead message, MessageContext ctx) 
        {
            Minecraft mc = net.minecraft.client.Minecraft.getMinecraft();
            mc.addScheduledTask(() -> 
            {
                switch(message.action)
                {
                    case 1:
                        PlayerHeadGui.INSTANCE.add(message.index, message.x, message.y, message.scale, message.name);
                        break;
                    case 2:
                        PlayerHeadGui.INSTANCE.remove(message.index);
                        break;
                    case 3: 
                        PlayerHeadGui.INSTANCE.clear();
                        break;
                }
            });
            return null;
        }
    }
}