#pragma once

#include "Property.h"

namespace key{

// When adding to this, also update the following
// - ShaderManager.cpp::getSize()
// - GetShaderTypeName
enum AttributeType{
	AT_FLOAT_VEC2 = GL_FLOAT_VEC2,
	AT_FLOAT_VEC3 = GL_FLOAT_VEC3,
	AT_FLOAT_VEC4 = GL_FLOAT_VEC4
};

// When adding to this, also update the following
// - ShaderManager.cpp::getSize()
// - GetShaderTypeName
enum UniformType{
	UT_FLOAT_MAT4 = GL_FLOAT_MAT4
};

template<typename Variable, typename Type>
class ShaderVariable{
	friend class ShaderManager;
	friend std::ostream& operator<<(std::ostream& out, const ShaderVariable<Variable, Type>& sv){
		return out<<"Variable{"<<sv._eVariable<<"} of type {"<<GetShaderTypeName(sv._eType)<<"}";
	}
private:
	Variable	_eVariable;
	Type		_eType;

public:
	ShaderVariable(Variable var, Type type);

	inline bool operator==(const ShaderVariable<Variable, Type>& rhs) const;
};

template<typename Variable, typename Type>
inline bool ShaderVariable<Variable, Type>::operator==(const ShaderVariable<Variable, Type>& rhs) const{
	return (_eVariable == rhs._eVariable && _eType == rhs._eType);
}

template<typename Type>
std::string GetShaderTypeName(Type type){
	switch(type){
	case AT_FLOAT_VEC2:
		return "float_vec2";
	case AT_FLOAT_VEC3:
		return "float_vec3";
	case AT_FLOAT_VEC4:
		return "float_vec4";
	case UT_FLOAT_MAT4:
		return "float_mat4";
	default:
		return "Type not specified in GetShaderTypeName.";
	}
}

typedef ShaderVariable<Attribute, AttributeType>	ShaderAttribute;
typedef ShaderVariable<Uniform, UniformType>		ShaderUniform;
}