#pragma once
#include "helpers.hpp"

namespace PICA {
	namespace InternalRegs {
		enum : u32 {
			// Rasterizer registers
			ViewportWidth = 0x41,
			ViewportInvw = 0x42,
			ViewportHeight = 0x43,
			ViewportInvh = 0x44,

			DepthScale = 0x4D,
			DepthOffset = 0x4E,
			ShaderOutputCount = 0x4F,
			ShaderOutmap0 = 0x50,

			DepthmapEnable = 0x6D,

			// Texture registers
			TexUnitCfg = 0x80,
			Tex0BorderColor = 0x81,
			Tex1BorderColor = 0x91,
			Tex2BorderColor = 0x99,
			TexEnvUpdateBuffer = 0xE0,
			TexEnvBufferColor = 0xFD,

			// clang-format off
			#define defineTexEnv(index, offset)   \
			TexEnv##index##Source   = offset + 0, \
			TexEnv##index##Operand  = offset + 1, \
			TexEnv##index##Combiner = offset + 2, \
			TexEnv##index##Color    = offset + 3, \
			TexEnv##index##Scale    = offset + 4,

			defineTexEnv(0, 0xC0)
			defineTexEnv(1, 0xC8)
			defineTexEnv(2, 0xD0)
			defineTexEnv(3, 0xD8)
			defineTexEnv(4, 0xF0)
			defineTexEnv(5, 0xF8)

			#undef defineTexEnv
			// clang-format on

			// Framebuffer registers
			ColourOperation = 0x100,
			BlendFunc = 0x101,
			BlendColour = 0x103,
			AlphaTestConfig = 0x104,
			DepthAndColorMask = 0x107,
			DepthBufferFormat = 0x116,
			ColourBufferFormat = 0x117,
			DepthBufferLoc = 0x11C,
			ColourBufferLoc = 0x11D,
			FramebufferSize = 0x11E,

			// Geometry pipeline registers
			VertexAttribLoc = 0x200,
			AttribFormatLow = 0x201,
			AttribFormatHigh = 0x202,
			IndexBufferConfig = 0x227,
			VertexCountReg = 0x228,
			VertexOffsetReg = 0x22A,
			SignalDrawArrays = 0x22E,
			SignalDrawElements = 0x22F,

			Attrib0Offset = 0x203,
			Attrib1Offset = 0x206,
			Attrib2Offset = 0x209,
			Attrib3Offset = 0x20C,
			Attrib4Offset = 0x20F,
			Attrib5Offset = 0x212,
			Attrib6Offset = 0x215,
			Attrib7Offset = 0x218,
			Attrib8Offset = 0x21B,
			Attrib9Offset = 0x21E,
			Attrib10Offset = 0x221,
			Attrib11Offset = 0x224,

			Attrib0Config2 = 0x205,
			Attrib1Config2 = 0x208,
			Attrib2Config2 = 0x20B,
			Attrib3Config2 = 0x20E,
			Attrib4Config2 = 0x211,
			Attrib5Config2 = 0x214,
			Attrib6Config2 = 0x217,
			Attrib7Config2 = 0x21A,
			Attrib8Config2 = 0x21D,
			Attrib9Config2 = 0x220,
			Attrib10Config2 = 0x223,
			Attrib11Config2 = 0x226,

			AttribInfoStart = Attrib0Offset,
			AttribInfoEnd = Attrib11Config2,

			// Fixed attribute registers
			FixedAttribIndex = 0x232,
			FixedAttribData0 = 0x233,
			FixedAttribData1 = 0x234,
			FixedAttribData2 = 0x235,

			// Command processor registers
			CmdBufSize0 = 0x238,
			CmdBufSize1 = 0x239,
			CmdBufAddr0 = 0x23A,
			CmdBufAddr1 = 0x23B,
			CmdBufTrigger0 = 0x23C,
			CmdBufTrigger1 = 0x23D,

			PrimitiveConfig = 0x25E,
			PrimitiveRestart = 0x25F,

			// Vertex shader registers
			VertexShaderAttrNum = 0x242,
			VertexBoolUniform = 0x2B0,
			VertexIntUniform0 = 0x2B1,
			VertexIntUniform1 = 0x2B2,
			VertexIntUniform2 = 0x2B3,
			VertexIntUniform3 = 0x2B4,

			VertexShaderEntrypoint = 0x2BA,
			VertexShaderTransferEnd = 0x2BF,
			VertexFloatUniformIndex = 0x2C0,
			VertexFloatUniformData0 = 0x2C1,
			VertexFloatUniformData1 = 0x2C2,
			VertexFloatUniformData2 = 0x2C3,
			VertexFloatUniformData3 = 0x2C4,
			VertexFloatUniformData4 = 0x2C5,
			VertexFloatUniformData5 = 0x2C6,
			VertexFloatUniformData6 = 0x2C7,
			VertexFloatUniformData7 = 0x2C8,

			VertexShaderInputBufferCfg = 0x2B9,
			VertexShaderInputCfgLow = 0x2BB,
			VertexShaderInputCfgHigh = 0x2BC,

			VertexShaderTransferIndex = 0x2CB,
			VertexShaderData0 = 0x2CC,
			VertexShaderData1 = 0x2CD,
			VertexShaderData2 = 0x2CE,
			VertexShaderData3 = 0x2CF,
			VertexShaderData4 = 0x2D0,
			VertexShaderData5 = 0x2D1,
			VertexShaderData6 = 0x2D2,
			VertexShaderData7 = 0x2D3,
			VertexShaderOpDescriptorIndex = 0x2D5,
			VertexShaderOpDescriptorData0 = 0x2D6,
			VertexShaderOpDescriptorData1 = 0x2D7,
			VertexShaderOpDescriptorData2 = 0x2D8,
			VertexShaderOpDescriptorData3 = 0x2D9,
			VertexShaderOpDescriptorData4 = 0x2DA,
			VertexShaderOpDescriptorData5 = 0x2DB,
			VertexShaderOpDescriptorData6 = 0x2DC,
			VertexShaderOpDescriptorData7 = 0x2DD,
		};
	}

	enum class TextureFmt : u32 {
		RGBA8 = 0x0,
		RGB8 = 0x1,
		RGBA5551 = 0x2,
		RGB565 = 0x3,
		RGBA4 = 0x4,
		IA8 = 0x5,
		RG8 = 0x6,
		I8 = 0x7,
		A8 = 0x8,
		IA4 = 0x9,
		I4 = 0xA,
		A4 = 0xB,
		ETC1 = 0xC,
		ETC1A4 = 0xD,
	};

	enum class ColorFmt : u32 {
		RGBA8 = 0x0,
		RGB8 = 0x1,
		RGBA5551 = 0x2,
		RGB565 = 0x3,
		RGBA4 = 0x4,
	};

	enum class DepthFmt : u32 {
		Depth16 = 0,
		Unknown1 = 1,  // Technically selectable, but function is unknown
		Depth24 = 2,
		Depth24Stencil8 = 3,
	};

	// Returns the string representation of a texture format
	inline constexpr const char* textureFormatToString(TextureFmt fmt) {
		switch (fmt) {
			case TextureFmt::RGBA8: return "RGBA8";
			case TextureFmt::RGB8: return "RGB8";
			case TextureFmt::RGBA5551: return "RGBA5551";
			case TextureFmt::RGB565: return "RGB565";
			case TextureFmt::RGBA4: return "RGBA4";
			case TextureFmt::IA8: return "IA8";
			case TextureFmt::RG8: return "RG8";
			case TextureFmt::I8: return "I8";
			case TextureFmt::A8: return "A8";
			case TextureFmt::IA4: return "IA4";
			case TextureFmt::I4: return "I4";
			case TextureFmt::A4: return "A4";
			case TextureFmt::ETC1: return "ETC1";
			case TextureFmt::ETC1A4: return "ETC1A4";
			default: return "Unknown";
		}
	}

	inline constexpr const char* textureFormatToString(ColorFmt fmt) {
		return textureFormatToString(static_cast<TextureFmt>(fmt));
	}

	inline constexpr bool hasStencil(DepthFmt format) { return format == PICA::DepthFmt::Depth24Stencil8; }

	// Size occupied by each pixel in bytes

	// All formats are 16BPP except for RGBA8 (32BPP) and BGR8 (24BPP)
	inline constexpr usize sizePerPixel(TextureFmt format) {
		switch (format) {
			case TextureFmt::RGB8: return 3;
			case TextureFmt::RGBA8: return 4;
			default: return 2;
		}
	}

	inline constexpr usize sizePerPixel(ColorFmt format) {
		return sizePerPixel(static_cast<TextureFmt>(format));
	}

	inline constexpr usize sizePerPixel(DepthFmt format) {
		switch (format) {
			case DepthFmt::Depth16: return 2;
			case DepthFmt::Depth24: return 3;
			case DepthFmt::Depth24Stencil8: return 4;
			default: return 1;  // Invalid format
		}
	}

	enum class PrimType : u32 {
		TriangleList = 0,
		TriangleStrip = 1,
		TriangleFan = 2,
		GeometryPrimitive = 3,
	};

}  // namespace PICA