Minecraft-Console-Client/MinecraftClient/Protocol/Handlers/StructuredComponents/Components/1_20_6/BannerPatternsComponent.cs

using System;
using System.Collections.Generic;
using MinecraftClient.Inventory.ItemPalettes;
using MinecraftClient.Protocol.Handlers.StructuredComponents.Core;

namespace MinecraftClient.Protocol.Handlers.StructuredComponents.Components._1_20_6;

public class BannerPatternsComponent(DataTypes dataTypes, ItemPalette itemPalette, SubComponentRegistry subComponentRegistry) 
    : StructuredComponent(dataTypes, itemPalette, subComponentRegistry)
{
    public int NumberOfLayers { get; set; }
    public List<BannerLayer> Layers { get; set; } = [];
    
    public override void Parse(Queue<byte> data)
    {
        NumberOfLayers = DataTypes.ReadNextVarInt(data);

        for (var i = 0; i < NumberOfLayers; i++)
        {
            var patternType = DataTypes.ReadNextVarInt(data);
            Layers.Add(new BannerLayer
            {
                PatternType = patternType,
                AssetId = patternType == 0 ? DataTypes.ReadNextString(data) : null,
                TranslationKey = patternType == 0 ? DataTypes.ReadNextString(data) : null,
                DyeColor = DataTypes.ReadNextVarInt(data)
            });
        }
    }

    public override Queue<byte> Serialize()
    {
        var data = new List<byte>();
        data.AddRange(DataTypes.GetVarInt(NumberOfLayers));

        if (NumberOfLayers > 0)
        {
            if (NumberOfLayers != Layers.Count)
                throw new Exception("Can't serialize BannerPatternsComponent because NumberOfLayers and Layers.Count differ!");

            foreach (var bannerLayer in Layers)
            {
                data.AddRange(DataTypes.GetVarInt(bannerLayer.PatternType));

                if (bannerLayer.PatternType == 0)
                {
                    if(string.IsNullOrEmpty(bannerLayer.AssetId) || string.IsNullOrEmpty(bannerLayer.TranslationKey))
                        throw new Exception("Can't serialize BannerPatternsComponent because AssetId or TranslationKey is null/empty!");
                    
                    data.AddRange(DataTypes.GetString(bannerLayer.AssetId));
                    data.AddRange(DataTypes.GetString(bannerLayer.TranslationKey));
                }
                
                data.AddRange(DataTypes.GetVarInt(bannerLayer.DyeColor));
            }
        }
        
        return new Queue<byte>(data);
    }
}

public record BannerLayer
{
    public int PatternType { get; set; }
    public string? AssetId { get; set; } = null!;
    public string? TranslationKey { get; set; } = null!;
    public int DyeColor { get; set; }
}