using System.Buffers.Binary;

namespace SarahEngine;

public interface INetworkable<T>
{
    void ToBytes(Span<byte> span);
    static abstract T FromBytes(ReadOnlySpan<byte> span);
    static int SizeOf {get;}
}

public struct NetInt(int i) : INetworkable<NetInt>
{
    public int Value = i;
    public static int SizeOf => sizeof(int);
    public readonly void ToBytes(Span<byte> span) => BinaryPrimitives.WriteInt32LittleEndian(span, Value);
    public static NetInt FromBytes(ReadOnlySpan<byte> span) => BinaryPrimitives.ReadInt32LittleEndian(span);

    public static implicit operator NetInt(int i) => new(i);
    public static implicit operator int(NetInt i) => i.Value;
}

public struct NetSingle(float f) : INetworkable<NetSingle>
{
    public float Value = f;
    public static int SizeOf => sizeof(float);
    public readonly void ToBytes(Span<byte> span) => BinaryPrimitives.WriteSingleLittleEndian(span, Value);
    public static NetSingle FromBytes(ReadOnlySpan<byte> span) => new(BinaryPrimitives.ReadSingleLittleEndian(span));

    public static implicit operator NetSingle(float f) => new(f);
    public static implicit operator float(NetSingle f) => f.Value;
}

public abstract class RPCBase
{
    static readonly List<RPCBase> AllRPCs = new();
    protected abstract void FromBytes(Span<byte> span);
}

public class RPC<T>(Action<T> method) : RPCBase where T : struct, INetworkable<T>
{
    readonly Action<T> Method = method;

    public void SendRPC(T param)
    {
        //blah blah blah, networking
    }

    protected override void FromBytes(Span<byte> span) => Method?.Invoke(T.FromBytes(span));
}

public class TestingRPC
{
    static void DoStuff(NetInt testInt) {}
    RPC<NetInt> Taco = new(DoStuff);

    public void OtherTest(int blah) {
        Taco.SendRPC(blah);
    }
}