using MessagePack;
using MessagePack.Formatters;

namespace OECS;

/// <summary>
/// Custom MessagePack formatter for <see cref="Entity"/>.
///
/// Reads and writes the raw 32-bit packed value as a single uint.
/// This avoids the readonly-field issue where MessagePack's built-in
/// deserialization path (reflection-based field assignment) cannot
/// write to <c>readonly</c> fields on value types.
/// </summary>
public class EntityFormatter : IMessagePackFormatter<Entity>
{
    public void Serialize(ref MessagePackWriter writer, Entity value, MessagePackSerializerOptions options)
    {
        writer.Write((uint)value);
    }

    public Entity Deserialize(ref MessagePackReader reader, MessagePackSerializerOptions options)
    {
        return (Entity)reader.ReadUInt32();
    }
}