// Copyright (C) 2017 Jérôme Leclercq
// This file is part of the "Nazara Development Kit"
// For conditions of distribution and use, see copyright notice in Prerequisites.hpp

#pragma once

#ifndef NDK_BASECOMPONENT_HPP
#define NDK_BASECOMPONENT_HPP

#include <NDK/Entity.hpp>
#include <functional>
#include <unordered_map>
#include <vector>

namespace Ndk
{
	class NDK_API BaseComponent
	{
		friend Entity;
		friend class Sdk;

		public:
			using Factory = std::function<BaseComponent*()>;

			BaseComponent(ComponentIndex componentIndex);
			BaseComponent(BaseComponent&&) noexcept = default;
			virtual ~BaseComponent();

			virtual std::unique_ptr<BaseComponent> Clone() const = 0;

			inline const EntityHandle& GetEntity() const;
			ComponentIndex GetIndex() const;

			inline static ComponentIndex GetMaxComponentIndex();

			BaseComponent& operator=(const BaseComponent&) = delete;
			BaseComponent& operator=(BaseComponent&&) noexcept = default;

		protected:
			BaseComponent(const BaseComponent&) = default;

			ComponentIndex m_componentIndex;
			EntityHandle m_entity;

			static ComponentIndex RegisterComponent(ComponentId id, Factory factoryFunc);

		private:
			virtual void OnAttached();
			virtual void OnComponentAttached(BaseComponent& component);
			virtual void OnComponentDetached(BaseComponent& component);
			virtual void OnDetached();
			virtual void OnEntityDestruction();
			virtual void OnEntityDisabled();
			virtual void OnEntityEnabled();

			void SetEntity(Entity* entity);

			static bool Initialize();
			static void Uninitialize();

			struct ComponentEntry
			{
				ComponentId id;
				Factory factory;
			};

			static std::vector<ComponentEntry> s_entries;
			static std::unordered_map<ComponentId, ComponentIndex> s_idToIndex;
	};
}

#include <NDK/BaseComponent.inl>

#endif // NDK_BASECOMPONENT_HPP