#pragma once
#include "Maths.h"
#include "DataTypes.h"
#include "BRDFs.h"

namespace dae
{
#pragma region Material BASE
	class Material
	{
	public:
		Material() = default;
		virtual ~Material() = default;

		Material(const Material&) = delete;
		Material(Material&&) noexcept = delete;
		Material& operator=(const Material&) = delete;
		Material& operator=(Material&&) noexcept = delete;

		/**
		 * \brief Function used to calculate the correct color for the specific material and its parameters
		 * \param hitRecord current hitrecord
		 * \param l light direction
		 * \param v view direction
		 * \return color
		 */
		virtual ColorRGB Shade(const HitRecord& hitRecord = {}, const Vector3& l = {}, const Vector3& v = {}) = 0;
	};
#pragma endregion

#pragma region Material SOLID COLOR
	//SOLID COLOR
	//===========
	class Material_SolidColor final : public Material
	{
	public:
		Material_SolidColor(const ColorRGB& color) : m_Color(color)
		{
		}

		ColorRGB Shade(const HitRecord& hitRecord, const Vector3& l, const Vector3& v) override
		{
			return m_Color;
		}

	private:
		ColorRGB m_Color{ colors::White };
	};
#pragma endregion

#pragma region Material LAMBERT
	//LAMBERT
	//=======
	class Material_Lambert final : public Material
	{
	public:
		Material_Lambert(const ColorRGB& diffuseColor, float diffuseReflectance) :
			m_DiffuseColor(diffuseColor), m_DiffuseReflectance(diffuseReflectance) {}

		ColorRGB Shade(const HitRecord& hitRecord = {}, const Vector3& l = {}, const Vector3& v = {}) override
		{
			//todo: W3
			throw std::runtime_error("Not Implemented Yet");
			return {};
		}

	private:
		ColorRGB m_DiffuseColor{ colors::White };
		float m_DiffuseReflectance{ 1.f }; //kd
	};
#pragma endregion

#pragma region Material LAMBERT PHONG
	//LAMBERT-PHONG
	//=============
	class Material_LambertPhong final : public Material
	{
	public:
		Material_LambertPhong(const ColorRGB& diffuseColor, float kd, float ks, float phongExponent) :
			m_DiffuseColor(diffuseColor), m_DiffuseReflectance(kd), m_SpecularReflectance(ks),
			m_PhongExponent(phongExponent)
		{
		}

		ColorRGB Shade(const HitRecord& hitRecord = {}, const Vector3& l = {}, const Vector3& v = {}) override
		{
			//todo: W3
			throw std::runtime_error("Not Implemented Yet");
			return {};
		}

	private:
		ColorRGB m_DiffuseColor{ colors::White };
		float m_DiffuseReflectance{ 0.5f }; //kd
		float m_SpecularReflectance{ 0.5f }; //ks
		float m_PhongExponent{ 1.f }; //Phong Exponent
	};
#pragma endregion

#pragma region Material COOK TORRENCE
	//COOK TORRENCE
	class Material_CookTorrence final : public Material
	{
	public:
		Material_CookTorrence(const ColorRGB& albedo, float metalness, float roughness) :
			m_Albedo(albedo), m_Metalness(metalness), m_Roughness(roughness)
		{
		}

		ColorRGB Shade(const HitRecord& hitRecord = {}, const Vector3& l = {}, const Vector3& v = {}) override
		{
			//todo: W3
			throw std::runtime_error("Not Implemented Yet");
			return {};
		}

	private:
		ColorRGB m_Albedo{ 0.955f, 0.637f, 0.538f }; //Copper
		float m_Metalness{ 1.0f };
		float m_Roughness{ 0.1f }; // [1.0 > 0.0] >> [ROUGH > SMOOTH]
	};
#pragma endregion
}
