#include <Entities/EntityMemoryPool.h>

#include <Entities/Entity.h>
#include <Globals.h>
//#include <cstddef>
#include <vector>

EntityMemoryPool::EntityMemoryPool()
{
	std::apply([=](auto&&... args) {((args.reserve(Global::MAX_ENTITIES)), ...); }, m_components);
  m_tags.reserve(Global::MAX_ENTITIES);
  m_aliveStates.reserve(Global::MAX_ENTITIES);

}

EntityMemoryPool& EntityMemoryPool::instance()
{
  static EntityMemoryPool pool{};
  return pool;
}

template<typename T>
bool EntityMemoryPool::hasComponent(EntityIndex id) const
{
  return std::get<std::vector<T>>(m_components)[id].active;
}

template<typename T>
T& EntityMemoryPool::getComponent(EntityIndex id) const
{
  return std::get<std::vector<T>>(m_components)[id];
}

template<typename T>
T& EntityMemoryPool::getComponent(EntityIndex id)
{
  return std::get<std::vector<T>>(m_components)[id];
}

EntityTag EntityMemoryPool::getTag(EntityIndex id) const 
{
  return m_tags[id];
}

bool EntityMemoryPool::getAlive(EntityIndex id) const
{
  return m_aliveStates[id];
}