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#ifndef SNIPPET_VEHICLE_WHEELQUERYRESULT_H
#define SNIPPET_VEHICLE_WHEELQUERYRESULT_H

#include "PxPhysicsAPI.h"
#include <new>

namespace snippetvehicle
{
using namespace physx;

//Data structure for quick setup of wheel query data structures.
class VehicleWheelQueryResults
{
public:

	VehicleWheelQueryResults()
		: mVehicleWheelQueryResults(NULL)
	{
	}

	~VehicleWheelQueryResults()
	{
	}

	//Allocate wheel results for up to maxNumVehicles with up to maxNumWheelsPerVehicle.
	static VehicleWheelQueryResults* allocate(const PxU32 maxNumVehicles, const PxU32 maxNumWheelsPerVehicle, PxAllocatorCallback& allocator)
	{
		const PxU32 byteSize = sizeof(VehicleWheelQueryResults) + sizeof(PxVehicleWheelQueryResult)*maxNumVehicles + sizeof(PxWheelQueryResult)*maxNumWheelsPerVehicle*maxNumVehicles;

		PxU8* buffer = static_cast<PxU8*>(allocator.allocate(byteSize, NULL, NULL, 0));

		VehicleWheelQueryResults* vwqr = reinterpret_cast<VehicleWheelQueryResults*>(buffer);
		buffer += sizeof(VehicleWheelQueryResults);

		vwqr->mVehicleWheelQueryResults = reinterpret_cast<PxVehicleWheelQueryResult*>(buffer);
		buffer+=sizeof(PxVehicleWheelQueryResult)*maxNumVehicles;

		for(PxU32 i=0;i<maxNumVehicles;i++)
		{
			new(buffer) PxWheelQueryResult();
			vwqr->mVehicleWheelQueryResults[i].wheelQueryResults = reinterpret_cast<PxWheelQueryResult*>(buffer);
			vwqr->mVehicleWheelQueryResults[i].nbWheelQueryResults = maxNumWheelsPerVehicle;
			buffer += sizeof(PxWheelQueryResult)*maxNumWheelsPerVehicle;
		}

		return vwqr;
	}

	//Free allocated buffer for scene queries of suspension raycasts.
	void free(PxAllocatorCallback& allocator)
	{
		allocator.deallocate(this);
	}

	//Return the PxVehicleWheelQueryResult for a vehicle specified by an index.
	PxVehicleWheelQueryResult* getVehicleWheelQueryResults(const PxU32 id)
	{
		return (mVehicleWheelQueryResults + id);
	}

private:

	PxVehicleWheelQueryResult* mVehicleWheelQueryResults;
};

} // namespace snippetvehicle

#endif //SNIPPET_VEHICLE_WHEELQUERYRESULT_H