BaseComponent.hpp

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

            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