Entity.h

#pragma once
 
#include <array>
#include <memory>
#include <bitset>
#include <vector>
 
#include "ColliderComponent.h"
#include "ECS.h"
#include "Constants.h"
 
// TODO: remove here if possible
// temporary fix: addComponent function template doesnt know TransformComponent -> error undefined type
#include "InputComponent.h"
#include "TransformComponent.h"
#include "SpriteComponent.h"
 
class Manager;
class Component;
 
using ComponentBitSet = std::bitset<MAX_COMPONENTS>;
using GroupBitSet = std::bitset<MAX_GROUPS>;
using ComponentArray = std::array<Component*, MAX_COMPONENTS>;
 
class Entity
{
public:
 
    enum class GroupLabel
    {
        MAPTILES, 
        PLAYERS, 
        ENEMIES, 
        COLLIDERS, 
        PROJECTILE, 
        HEARTS, 
        POWERUPS 
    };
 
    explicit Entity(Manager& mManager) :
        manager(mManager) { };
 
    void update() const; 
 
    bool isActive() const { return this->active; } 
    void destroy() {
        this->active = false;
        if (this->hasComponent<ColliderComponent>()) {
            this->getComponent<ColliderComponent>().removeCollision();
        }
    }
 
    bool hasGroup(Group mGroup); 
    void addGroup(Group mGroup); 
    void delGroup(Group mGroup); 
    std::bitset<MAX_GROUPS> getGroupBitSet();
 
    Manager& getManager() { return manager; };
 
    template <typename T> bool hasComponent() const 
    {
        return componentBitSet[getComponentTypeID<T>()];
    }
 
    template <typename T, typename...TArgs> T& addComponent(TArgs&&...mArgs)
    {
        T* c(new T(std::forward<TArgs>(mArgs)...));
        c->entity = this;
        std::unique_ptr<Component> uPtr{ c };
        this->components.emplace_back(std::move(uPtr));
 
        componentArray[getComponentTypeID<T>()] = c;
        componentBitSet[getComponentTypeID<T>()] = true;
 
        c->init();
        return *c;
    };
    
    template <typename T> T& getComponent() const 
    {
        auto ptr(componentArray[getComponentTypeID<T>()]);
        return *static_cast<T*>(ptr);
    }
 
private:
    Manager& manager;
    bool active = true;
    std::vector<std::unique_ptr<Component>> components;
 
    ComponentArray componentArray = {};
    ComponentBitSet componentBitSet;
    GroupBitSet groupBitSet;
};