Entity.h

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/*
MIT License
 
Copyright (c) 2023 Víctor Falcón Zaro
 
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
 
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
 
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
 
#pragma once
#include "Scene.h"
#include "Components.h"
#include "Entt/entt.hpp"
 
namespace Raito::ECS
{
    class Entity
    {
    public:
        Entity() = default;
        Entity(entt::entity handle, Scene* scene);
        Entity(const Entity& other) = default;
 
        template<typename T, typename... Args>
        T& AddComponent(Args&&... args)
        {
            ASSERT(!HasComponent<T>());
            T& component = m_Scene->m_Registry.emplace<T>(m_EntityHandle, std::forward<Args>(args)...);
            return component;
        }
 
        template<typename T, typename... Args>
        T& AddOrReplaceComponent(Args&&... args)
        {
            T& component = m_Scene->m_Registry.emplace_or_replace<T>(m_EntityHandle, std::forward<Args>(args)...);
            return component;
        }
 
        template<typename T>
        T& GetComponent()
        {
            ASSERT(HasComponent<T>());
            return m_Scene->m_Registry.get<T>(m_EntityHandle);
        }
 
        template<typename T>
        bool HasComponent() const
        {
            return m_Scene->m_Registry.all_of<T>(m_EntityHandle);
        }
 
        template<typename T>
        void RemoveComponent() const
        {
            ASSERT(HasComponent<T>());
            m_Scene->m_Registry.remove<T>(m_EntityHandle);
        }
 
        operator bool() const { return m_EntityHandle != entt::null; }
        operator entt::entity() const { return m_EntityHandle; }
        operator uint32_t() const { return (u32)m_EntityHandle; }
 
        UUID GetUUID() { return GetComponent<IDComponent>().ID; }
        const std::string& GetName() { return GetComponent<TagComponent>().Tag; }
 
        bool operator==(const Entity& other) const
        {
            return m_EntityHandle == other.m_EntityHandle && m_Scene == other.m_Scene;
        }
 
        bool operator!=(const Entity& other) const
        {
            return !(*this == other);
        }
 
    private:
        entt::entity m_EntityHandle = entt::null;
        Scene* m_Scene = nullptr;
    };
}