#include "dxheaders.hpp"
#include "graphics/blendstate.hpp"
#include "graphics/adapter.hpp"

namespace xna {
	struct DxHelpers {
		static constexpr DXGI_FORMAT ConvertSurfaceToDXGIFORMAT(SurfaceFormat format)
		{
			switch (format)
			{
			case SurfaceFormat::Color://21                
				return DXGI_FORMAT_R8G8B8A8_UNORM;
			case SurfaceFormat::Bgr565: //23                
				return DXGI_FORMAT_B5G6R5_UNORM;
			case SurfaceFormat::Bgra5551://25                
				return DXGI_FORMAT_B5G5R5A1_UNORM;
			case SurfaceFormat::Bgra4444://26                
				return DXGI_FORMAT_B4G4R4A4_UNORM;
			case SurfaceFormat::Dxt1://827611204                
				return DXGI_FORMAT_BC1_UNORM;
			case SurfaceFormat::Dxt3://861165636                
				return DXGI_FORMAT_BC2_UNORM;
			case SurfaceFormat::Dxt5://894720068                
				return DXGI_FORMAT_BC3_UNORM;
			case SurfaceFormat::NormalizedByte2://60                
				return DXGI_FORMAT_R8G8_SNORM;
			case SurfaceFormat::NormalizedByte4://63                
				return DXGI_FORMAT_R8G8B8A8_SNORM;
			case SurfaceFormat::Rgba1010102://31                
				return DXGI_FORMAT_R10G10B10A2_UNORM;
			case SurfaceFormat::Rg32://34                
				return DXGI_FORMAT_R16G16_UNORM;
			case SurfaceFormat::Rgba64://36                
				return DXGI_FORMAT_R16G16B16A16_UNORM;
			case SurfaceFormat::Alpha8://28
				return DXGI_FORMAT_A8_UNORM;
			case SurfaceFormat::Single://114                
				return DXGI_FORMAT_R32_FLOAT;
			case SurfaceFormat::Vector2://115                
				return DXGI_FORMAT_R32G32_FLOAT;
			case SurfaceFormat::Vector4://116                
				return DXGI_FORMAT_R32G32B32A32_FLOAT;
			case SurfaceFormat::HalfSingle://111                
				return DXGI_FORMAT_R16_FLOAT;
			case SurfaceFormat::HalfVector2://112                
				return DXGI_FORMAT_R16G16_FLOAT;
			case SurfaceFormat::HalfVector4://113                
				return DXGI_FORMAT_R16G16B16A16_FLOAT;
			case SurfaceFormat::HdrBlendable://113                
				return DXGI_FORMAT_R16G16B16A16_FLOAT;
			default://0                
				return DXGI_FORMAT_UNKNOWN;
			}
		}

		static constexpr SurfaceFormat ConvertDXGIFORMATToSurface(DXGI_FORMAT format) {
			switch (format)
			{
			case DXGI_FORMAT_R8G8B8A8_UNORM:
			case DXGI_FORMAT_B8G8R8A8_UNORM:
				return SurfaceFormat::Color;
			case DXGI_FORMAT_B5G6R5_UNORM:
				return SurfaceFormat::Bgr565;
			case DXGI_FORMAT_B5G5R5A1_UNORM:
				return SurfaceFormat::Bgra5551;
			case DXGI_FORMAT_B4G4R4A4_UNORM:
				return SurfaceFormat::Bgra4444;
			case DXGI_FORMAT_BC2_UNORM:
				return SurfaceFormat::Dxt3;
			case DXGI_FORMAT_BC3_UNORM:
				return SurfaceFormat::Dxt5;
			case DXGI_FORMAT_R8G8_SNORM:
				return  SurfaceFormat::NormalizedByte2;
			case DXGI_FORMAT_R8G8B8A8_SNORM:
				return SurfaceFormat::NormalizedByte4;
			case DXGI_FORMAT_R10G10B10A2_UNORM:
				return SurfaceFormat::Rgba1010102;
			case DXGI_FORMAT_R16G16_UNORM:
				return SurfaceFormat::Rg32;
			case DXGI_FORMAT_R16G16B16A16_UNORM:
				return SurfaceFormat::Rgba64;
			case DXGI_FORMAT_A8_UNORM:
				return SurfaceFormat::Alpha8;
			case DXGI_FORMAT_R32_FLOAT:
				return SurfaceFormat::Single;
			case DXGI_FORMAT_R32G32_FLOAT:
				return SurfaceFormat::Vector2;
			case DXGI_FORMAT_R32G32B32A32_FLOAT:
				return SurfaceFormat::Vector4;
			case DXGI_FORMAT_R16_FLOAT:
				return SurfaceFormat::HalfSingle;
			case DXGI_FORMAT_R16G16_FLOAT:
				return SurfaceFormat::HalfVector2;
			case DXGI_FORMAT_R16G16B16A16_FLOAT:
				return SurfaceFormat::HalfVector4;
			default:
				return SurfaceFormat::Unknown;
			}
		}

		static constexpr D3D11_BLEND ConvertBlend(Blend blend) {
			switch (blend)
			{
			case xna::Blend::Zero:
				return D3D11_BLEND_ZERO;
			case xna::Blend::One:
				return D3D11_BLEND_ONE;
			case xna::Blend::SourceColor:
				return D3D11_BLEND_SRC_COLOR;
			case xna::Blend::InverseSourceColor:
				return D3D11_BLEND_INV_SRC_COLOR;
			case xna::Blend::SourceAlpha:
				return D3D11_BLEND_SRC_ALPHA;
			case xna::Blend::InverseSourceAlpha:
				return D3D11_BLEND_INV_SRC_ALPHA;
			case xna::Blend::DestinationAlpha:
				return D3D11_BLEND_DEST_ALPHA;
			case xna::Blend::InverseDestinationAlpha:
				return D3D11_BLEND_INV_DEST_ALPHA;
			case xna::Blend::DestinationColor:
				return D3D11_BLEND_DEST_COLOR;
			case xna::Blend::InverseDestinationColor:
				return D3D11_BLEND_INV_DEST_COLOR;
			case xna::Blend::SourceAlphaSaturation:
				return D3D11_BLEND_SRC_ALPHA_SAT;
			case xna::Blend::BlendFactor:
				return D3D11_BLEND_BLEND_FACTOR;
			case xna::Blend::InverseBlendFactor:
				return D3D11_BLEND_INV_BLEND_FACTOR;
			case xna::Blend::Source1Color:
				return D3D11_BLEND_SRC1_COLOR;
			case xna::Blend::InverseSource1Color:
				return D3D11_BLEND_INV_SRC1_COLOR;
			case xna::Blend::Source1Alpha:
				return D3D11_BLEND_SRC1_ALPHA;
			case xna::Blend::InverseSource1Alpha:
				return D3D11_BLEND_INV_SRC1_ALPHA;
			default:
				return D3D11_BLEND_ZERO;
			}
		}

		static constexpr D3D11_BLEND_OP ConvertOperation(BlendOperation op) {
			return static_cast<D3D11_BLEND_OP>(static_cast<int>(op) + 1);
		}

		static constexpr D3D11_COLOR_WRITE_ENABLE ConvertColorWrite(ColorWriteChannels colorWrite) {
			switch (colorWrite)
			{
			case xna::ColorWriteChannels::Red:
				return D3D11_COLOR_WRITE_ENABLE_RED;
			case xna::ColorWriteChannels::Green:
				return D3D11_COLOR_WRITE_ENABLE_GREEN;
			case xna::ColorWriteChannels::Blue:
				return D3D11_COLOR_WRITE_ENABLE_BLUE;
			case xna::ColorWriteChannels::Alpha:
				return D3D11_COLOR_WRITE_ENABLE_ALPHA;
			case xna::ColorWriteChannels::All:
				return D3D11_COLOR_WRITE_ENABLE_ALL;
			default:
				return D3D11_COLOR_WRITE_ENABLE_ALL;
			}
		}

		static constexpr void ConvertAddressMode(TextureAddressMode value, D3D11_TEXTURE_ADDRESS_MODE& target) {
			target = static_cast<D3D11_TEXTURE_ADDRESS_MODE>(static_cast<int>(value) + 1);
		}

		static constexpr void ConvertAddressMode(D3D11_TEXTURE_ADDRESS_MODE value, TextureAddressMode& target) {
			target = static_cast<TextureAddressMode>(value - 1);
		}
	};
}