/*************************************************************************/
/*  godot_ray_world_algorithm.h                                          */
/*************************************************************************/
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#ifndef GODOT_RAY_WORLD_ALGORITHM_H
#define GODOT_RAY_WORLD_ALGORITHM_H

#include <BulletCollision/CollisionDispatch/btActivatingCollisionAlgorithm.h>
#include <BulletCollision/CollisionDispatch/btCollisionCreateFunc.h>
#include <BulletCollision/CollisionDispatch/btCollisionDispatcher.h>

class btDiscreteDynamicsWorld;

class GodotRayWorldAlgorithm : public btActivatingCollisionAlgorithm {
	const btDiscreteDynamicsWorld *m_world;
	btPersistentManifold *m_manifoldPtr;
	bool m_ownManifold = false;
	bool m_isSwapped = false;

public:
	GodotRayWorldAlgorithm(const btDiscreteDynamicsWorld *world, btPersistentManifold *mf, const btCollisionAlgorithmConstructionInfo &ci, const btCollisionObjectWrapper *body0Wrap, const btCollisionObjectWrapper *body1Wrap, bool isSwapped);
	virtual ~GodotRayWorldAlgorithm();

	virtual void processCollision(const btCollisionObjectWrapper *body0Wrap, const btCollisionObjectWrapper *body1Wrap, const btDispatcherInfo &dispatchInfo, btManifoldResult *resultOut);
	virtual btScalar calculateTimeOfImpact(btCollisionObject *body0, btCollisionObject *body1, const btDispatcherInfo &dispatchInfo, btManifoldResult *resultOut);

	virtual void getAllContactManifolds(btManifoldArray &manifoldArray) {
		///should we use m_ownManifold to avoid adding duplicates?
		if (m_manifoldPtr && m_ownManifold) {
			manifoldArray.push_back(m_manifoldPtr);
		}
	}
	struct CreateFunc : public btCollisionAlgorithmCreateFunc {
		const btDiscreteDynamicsWorld *m_world;
		CreateFunc(const btDiscreteDynamicsWorld *world);

		virtual btCollisionAlgorithm *CreateCollisionAlgorithm(btCollisionAlgorithmConstructionInfo &ci, const btCollisionObjectWrapper *body0Wrap, const btCollisionObjectWrapper *body1Wrap) {
			void *mem = ci.m_dispatcher1->allocateCollisionAlgorithm(sizeof(GodotRayWorldAlgorithm));
			return new (mem) GodotRayWorldAlgorithm(m_world, ci.m_manifold, ci, body0Wrap, body1Wrap, false);
		}
	};

	struct SwappedCreateFunc : public btCollisionAlgorithmCreateFunc {
		const btDiscreteDynamicsWorld *m_world;
		SwappedCreateFunc(const btDiscreteDynamicsWorld *world);

		virtual btCollisionAlgorithm *CreateCollisionAlgorithm(btCollisionAlgorithmConstructionInfo &ci, const btCollisionObjectWrapper *body0Wrap, const btCollisionObjectWrapper *body1Wrap) {
			void *mem = ci.m_dispatcher1->allocateCollisionAlgorithm(sizeof(GodotRayWorldAlgorithm));
			return new (mem) GodotRayWorldAlgorithm(m_world, ci.m_manifold, ci, body0Wrap, body1Wrap, true);
		}
	};
};

#endif // GODOT_RAY_WORLD_ALGORITHM_H