#include "PrecompiledHeader.h"
#include "TransformSystem.h"
#include "World.h"

//void Systems::TransformSystem::UpdateEntity(double dt, EntityID entity, EntityID parent)
//{
//	if (parent == 0)
//		return;
//
//	auto transform = m_World->GetComponent<Components::Transform>(entity, "Transform");
//	auto parentTransform = m_World->GetComponent<Components::Transform>(parent, "Transform");
//
//	transform->Position = parentTransform->Position + transform->RelativePosition;
//}

glm::vec3 Systems::TransformSystem::AbsolutePosition(EntityID entity)
{
	glm::vec3 absPosition;
	glm::quat accumulativeOrientation;

	do
	{
		auto transform = m_World->GetComponent<Components::Transform>(entity, "Transform");
		//absPosition += transform->Position;
		entity = m_World->GetEntityParent(entity);
		auto transform2 = m_World->GetComponent<Components::Transform>(entity, "Transform");
		if (entity != 0)
			absPosition += transform2->Orientation * transform->Position;
		else
			absPosition += transform->Position;
	} while (entity != 0);

	return absPosition * accumulativeOrientation;
}

glm::quat Systems::TransformSystem::AbsoluteOrientation(EntityID entity)
{
	glm::quat absOrientation;

	do
	{
		auto transform = m_World->GetComponent<Components::Transform>(entity, "Transform");
		absOrientation = transform->Orientation * absOrientation;
		entity = m_World->GetEntityParent(entity);
	} while (entity != 0);

	return absOrientation;
}

glm::vec3 Systems::TransformSystem::AbsoluteScale(EntityID entity)
{
	glm::vec3 absScale(1);

	do
	{
		auto transform = m_World->GetComponent<Components::Transform>(entity, "Transform");
		absScale *= transform->Scale;
		entity = m_World->GetEntityParent(entity);
	} while (entity != 0);

	return absScale;
}