#ifndef INCLUDE_GL_SHADER_PROGRAM_INSTANCE_IMPLEMENTATION
#error Never include this file directly include 'shader_program_handle.hpp'
#endif

#include "glm/glm.hpp"
#include "glm/gtc/type_ptr.hpp"

namespace zgl
{
inline void shader_program_handle::bind() const
{
	glUseProgram(program_id);
}

inline void shader_program_handle::unbind()
{
	glUseProgram(0);
}

template<shader_program_variable::info_type VariableInfo, typename T>
void shader_program_handle::set_uniform(const T& value) const
{
	if constexpr (std::same_as<T, glm::mat4x4>)
	{
		static_assert(VariableInfo.type == GL_FLOAT_MAT4);
		glUniformMatrix4fv(VariableInfo.location, 1, false, glm::value_ptr(value));
	}
	else if constexpr (std::same_as<T, glm::mat3x3>)
	{
		static_assert(VariableInfo.type == GL_FLOAT_MAT3);
		glUniformMatrix3fv(VariableInfo.location, 1, false, glm::value_ptr(value));
	}
	else if constexpr (std::same_as<T, glm::fvec4>)
	{
		static_assert(VariableInfo.type == GL_FLOAT_VEC4);
		glUniform4fv(VariableInfo.location, 1, glm::value_ptr(value));
	}
	else if constexpr (std::same_as<T, glm::fvec3>)
	{
		static_assert(VariableInfo.type == GL_FLOAT_VEC3);
		glUniform3fv(VariableInfo.location, 1, glm::value_ptr(value));
	}
	else if constexpr (std::same_as<T, glm::fvec2>)
	{
		static_assert(VariableInfo.type == GL_FLOAT_VEC2);
		glUniform2fv(VariableInfo.location, 1, glm::value_ptr(value));
	}
	else if constexpr (std::same_as<T, float>)
	{
		static_assert(VariableInfo.type == GL_FLOAT);
		glUniform1f(VariableInfo.location, value);
	}
	else if constexpr (std::same_as<T, int>)
	{
		static_assert(VariableInfo.type == GL_INT or VariableInfo.type == GL_SAMPLER_2D);
		glUniform1i(VariableInfo.location, value);
	}
	else
	{
		T::_unknown_shader_uniform_type_;
	}
}
}