namespace Dashboard.Drawing
{
    public record GlslShaderCreateInfo() : IShaderCreateInfo
    {
        public required string VertexShader { get; init; }
        public string? GeometryShader { get; init; } = null;
        public string? TesselationControl { get; init; } = null;
        public string? TesselationEvaluation { get; init; } = null;
        public string? FragmentShader { get; init; } = null;
    }

    public record GlslComputeShaderCreateInfo(string Source) : IShaderCreateInfo
    {
    }

    public record SpirvShaderCreateInfo(byte[] Binary) : IShaderCreateInfo
    {
        public int Format { get; init; } = Spirv;

        public SpirvShaderCreateInfo(Stream stream) : this(GetBinary(stream)) { }

        private static byte[] GetBinary(Stream stream)
        {
            //FIXME: this might actually be copying twice.
            if (stream is MemoryStream ms)
            {
                return ms.ToArray();
            }
            else
            {
                using MemoryStream memory = new MemoryStream();
                stream.CopyTo(memory);
                return memory.ToArray();
            }
        }

        private const int Spirv = 38225;
    }
}