#pragma once

#include <td/protocol/command/Commands.h>
#include <td/simulation/WorldSnapshot.h>

namespace td {
namespace game {
class World;
}

namespace sim {

class IWorldSystem {
  public:
	virtual void Tick(const game::World& a_World, WorldSnapshot& a_State, FpFloat a_Delta) = 0;
};

class WorldTicker {
  private:
	std::vector<std::unique_ptr<IWorldSystem>> m_Systems;

  public:
	WorldTicker();

	WorldSnapshot NextStep(
		const game::World& a_World, WorldSnapshot& a_PreviousState, const protocol::LockStep& a_LockStep, FpFloat a_Delta);

  private:
	void ApplySteps(const game::World& a_World, WorldSnapshot& a_State, const protocol::LockStep& a_LockStep);
	void Tick(const game::World& a_World, WorldSnapshot& a_State, FpFloat a_Delta);
	WorldSnapshot CreateNext(WorldSnapshot& a_PreviousState);

	template <typename T>
	void AddSystem() {
		m_Systems.push_back(std::move(std::make_unique<T>()));
	}
};

}  // namespace sim
}  // namespace td