#ifndef PHYSICS_H
#define PHYSICS_H

#include "tier0/platform.h"
#include "trig.h"


typedef void *HShape;
typedef void *HCollider;

#ifndef PHYSICS_OBJECT_DEFINED
struct BallShape_t
{
	float m_fRadius;
};

struct CuboidShape_t
{
	float m_fExtentX;
	float m_fExtentY;
	float m_fExtentZ;
};

struct TriangleMeshShape_t
{
	float *m_pfPositions;
	uint32_t m_nPositionCount;
	uint32_t *m_puIndicies;
	uint32_t m_nIndiciesCount;
};

struct CastResult_t
{
	bool m_bIsHit;
	HCollider m_hCollider;

	Vector m_vCollisionPoint;

	// 0 to 1
	float m_fTime;
	// 0 to lenght
	float m_fDistance;
};

enum EPhysicsBodyType
{
	k_EPhysics_Static,
	k_EPhysics_Dynamic,
	k_EPhysics_KinematicPositionBased,
	k_EPhysics_KinematicVelocityBased,
};
#endif


abstract_class IPhysicsBody
{
public:
	virtual void SetPosition( Vector vPosition ) = 0;
	virtual void SetRotation( Quat vRotation ) = 0;

	virtual Vector GetPosition() = 0;
	virtual Quat GetRotation() = 0;

	virtual void SetType( EPhysicsBodyType eType ) = 0;
	virtual void SetGravityScale( float fScale ) = 0;
};

abstract_class IPhysicsWorld
{
public:
	virtual void Frame( float fDelta ) = 0;

	virtual IPhysicsBody *CreateRigidBody( HCollider hCollider, EPhysicsBodyType eType ) = 0;
	virtual void DestroyPhysicsBody( IPhysicsBody *pBody ) = 0;

	virtual void SetGravity( float fGravity ) = 0;

	virtual CastResult_t RayCast( Vector vBegin, Vector vEnd ) = 0;
	virtual CastResult_t ShapeCast( HShape hShape, Quat vOrientation, Vector vBegin, Vector vEnd ) = 0;
};



abstract_class IPhysics
{
public:
	virtual HShape CreateBall( BallShape_t ball ) = 0;
	virtual HShape CreateCube( CuboidShape_t ball ) = 0;
	virtual HShape CreateTriangleMesh( TriangleMeshShape_t shape ) = 0;
	virtual void DestroyShape( HShape hShape ) = 0;

	virtual HCollider CreateCollider( HShape hShape ) = 0;

	virtual IPhysicsWorld *CreateWorld() = 0;
	virtual void DestroyWorld( IPhysicsWorld *pWorld ) = 0;
};

#define PHYSICS_INTERFACE_VERSION "Physics001"

#endif