CollisionSystem.hpp

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#pragma once

#include "Engine/Collision/CollisionTypes.hpp"
#include "Engine/Collision/RaycastCallback.hpp"
#include "Engine/Collision/CollisionCallback.hpp"
#include "Engine/Components/CollisionComponent.hpp"
#include "Engine/api.hpp"

#include <ThirdParty/Box2D/Box2D/Box2D.h>

#include <ThirdParty/EASTL-master/include/EASTL/shared_ptr.h>
#include <ThirdParty/EASTL-master/include/EASTL/vector.h>
#include <ThirdParty/EASTL-master/include/EASTL/map.h>
#include <ThirdParty/glm/glm/detail/type_vec2.hpp>


namespace Engine
{
    class ENGINE_API CollisionSystem
    {
        friend class Engine;
        typedef eastl::shared_ptr<Entity> EntityPtr;
        
        CollisionSystem();
    public:
        ~CollisionSystem();
    private:

        friend class CollisionComponent;
        void AddCollisionComponent(eastl::weak_ptr<CollisionComponent> componentToAdd);
        void RemoveCollisionComponent(CollisionComponent* componentToRemove);

        void OnLevelLoaded();
        void OnLevelUnloaded();
    public:
    
        void Stop();

        void Start();

        void Update();

        eastl::weak_ptr<Entity> RayQueryFirstHit(const glm::vec2& start, const glm::vec2& end, CollisionLayer detectionLayers) const;

        eastl::weak_ptr<Entity> RayQueryAllHit(const glm::vec2& start, const glm::vec2& end) const; // TODO - Implementation

        bool IsRunning() const;

        eastl::vector<eastl::weak_ptr<CollisionComponent>>  GetActiveCollisionComponents() const;

    private:
        void ClearWorld();

        eastl::vector<eastl::weak_ptr<CollisionComponent>> collisionComponents_;    
        b2World world_;                 
        bool isRunning_;                
        EntityContact entityContactCallback_; 
    };
} // namespace Engine