/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

/*
 * Copyright (C) 2006-2010 - Frictional Games
 *
 * This file is part of HPL1 Engine.
 */

#ifndef HPL_PHYSICS_WORLD_H
#define HPL_PHYSICS_WORLD_H

#include "hpl1/engine/graphics/GraphicsTypes.h"
#include "hpl1/engine/math/MathTypes.h"
#include "hpl1/engine/system/SystemTypes.h"
#include "common/stablemap.h"

#include "hpl1/engine/physics/CollideData.h"

#include "hpl1/engine/game/SaveGame.h"

namespace hpl {

class iCollideShape;
class iVertexBuffer;
class iPhysicsBody;
class iLowLevelGraphics;
class iPhysicsMaterial;
class iCharacterBody;
class iPhysicsJoint;
class iPhysicsJointBall;
class iPhysicsJointHinge;
class iPhysicsJointScrew;
class iPhysicsJointSlider;
class iPhysicsController;
class cWorld3D;
class cBoundingVolume;

typedef Common::List<iCollideShape *> tCollideShapeList;
typedef tCollideShapeList::iterator tCollideShapeListIt;

typedef Common::Array<iCollideShape *> tCollideShapeVec;
typedef tCollideShapeVec::iterator tCollideShapeVecIt;

typedef Common::List<iPhysicsBody *> tPhysicsBodyList;
typedef tPhysicsBodyList::iterator tPhysicsBodyListIt;

typedef Common::List<iPhysicsJoint *> tPhysicsJointList;
typedef tPhysicsJointList::iterator tPhysicsJointListIt;

typedef Common::List<iPhysicsController *> tPhysicsControllerList;
typedef tPhysicsControllerList::iterator tPhysicsControllerListIt;

typedef Common::List<iCharacterBody *> tCharacterBodyList;
typedef tCharacterBodyList::iterator tCharacterBodyListIt;

typedef Common::StableMap<tString, iPhysicsMaterial *> tPhysicsMaterialMap;
typedef tPhysicsMaterialMap::iterator tPhysicsMaterialMapIt;

typedef cSTLMapIterator<iPhysicsMaterial *, tPhysicsMaterialMap, tPhysicsMaterialMapIt> cPhysicsMaterialIterator;

typedef cSTLIterator<iPhysicsBody *, tPhysicsBodyList, tPhysicsBodyListIt> cPhysicsBodyIterator;
typedef cSTLIterator<iPhysicsJoint *, tPhysicsJointList, tPhysicsJointListIt> cPhysicsJointIterator;

enum ePhysicsAccuracy {
	ePhysicsAccuracy_Low,
	ePhysicsAccuracy_Medium,
	ePhysicsAccuracy_High,
	ePhysicsAccuracy_LastEnum
};

//----------------------------------------------------

struct cPhysicsRayParams {
	constexpr cPhysicsRayParams() {}
	float mfT = 0;
	float mfDist = 0;
	cVector3f mvNormal = {0, 0, 0};
	cVector3f mvPoint = {0, 0, 0};
};

class iPhysicsRayCallback {
public:
	virtual ~iPhysicsRayCallback() = default;
	virtual bool BeforeIntersect(iPhysicsBody *pBody) { return true; }
	virtual bool OnIntersect(iPhysicsBody *pBody, cPhysicsRayParams *apParams) = 0;
};

class iPhysicsWorldCollisionCallback {
public:
	virtual ~iPhysicsWorldCollisionCallback() = default;
	virtual void OnCollision(iPhysicsBody *apBody, cCollideData *apCollideData) = 0;
};

//----------------------------------------------------

class iPhysicsWorld {
public:
	iPhysicsWorld();
	virtual ~iPhysicsWorld();

	//########################################################################################
	//! \name General
	//########################################################################################
	//! @{

	void Update(float afTimeStep);
	virtual void Simulate(float afTimeStep) = 0;

	virtual void SetMaxTimeStep(float afTimeStep) = 0;
	virtual float GetMaxTimeStep() = 0;

	virtual void SetWorldSize(const cVector3f &avMin, const cVector3f &avMax) = 0;
	virtual cVector3f GetWorldSizeMin() = 0;
	virtual cVector3f GetWorldSizeMax() = 0;

	virtual void SetGravity(const cVector3f &avGravity) = 0;
	virtual cVector3f GetGravity() = 0;

	virtual void SetAccuracyLevel(ePhysicsAccuracy aAccuracy) = 0;
	virtual ePhysicsAccuracy GetAccuracyLevel() = 0;
	//! @}

	//########################################################################################
	//! \name Shapes
	//########################################################################################
	//! @{

	virtual iCollideShape *CreateNullShape() = 0;
	virtual iCollideShape *CreateBoxShape(const cVector3f &avSize, cMatrixf *apOffsetMtx) = 0;
	virtual iCollideShape *CreateSphereShape(const cVector3f &avRadii, cMatrixf *apOffsetMtx) = 0;
	virtual iCollideShape *CreateCylinderShape(float afRadius, float afHeight, cMatrixf *apOffsetMtx) = 0;
	virtual iCollideShape *CreateCapsuleShape(float afRadius, float afHeight, cMatrixf *apOffsetMtx) = 0;
	virtual iCollideShape *CreateMeshShape(iVertexBuffer *apVtxBuffer) = 0;
	virtual iCollideShape *CreateCompundShape(tCollideShapeVec &avShapes) = 0;
	void DestroyShape(iCollideShape *apShape);

	//! @}

	//########################################################################################
	//! \name Joints
	//########################################################################################
	//! @{

	virtual iPhysicsJointBall *CreateJointBall(const tString &asName,
											   const cVector3f &avPivotPoint,
											   iPhysicsBody *apParentBody, iPhysicsBody *apChildBody) = 0;
	virtual iPhysicsJointHinge *CreateJointHinge(const tString &asName,
												 const cVector3f &avPivotPoint, const cVector3f &avPinDir,
												 iPhysicsBody *apParentBody, iPhysicsBody *apChildBody) = 0;
	virtual iPhysicsJointSlider *CreateJointSlider(const tString &asName,
												   const cVector3f &avPivotPoint, const cVector3f &avPinDir,
												   iPhysicsBody *apParentBody, iPhysicsBody *apChildBody) = 0;
	virtual iPhysicsJointScrew *CreateJointScrew(const tString &asName,
												 const cVector3f &avPivotPoint, const cVector3f &avPinDir,
												 iPhysicsBody *apParentBody, iPhysicsBody *apChildBody) = 0;
	void DestroyJoint(iPhysicsJoint *apJoint);
	iPhysicsJoint *GetJoint(const tString &asName);
	cPhysicsJointIterator GetJointIterator();

	//! @}

	//########################################################################################
	//! \name Materials
	//########################################################################################
	//! @{

	virtual iPhysicsMaterial *CreateMaterial(const tString &asName) = 0;
	iPhysicsMaterial *GetMaterialFromName(const tString &asName);
	cPhysicsMaterialIterator GetMaterialIterator();

	//! @}

	//########################################################################################
	//! \name Bodies
	//########################################################################################
	//! @{

	virtual iPhysicsBody *CreateBody(const tString &asName, iCollideShape *apShape) = 0;
	void DestroyBody(iPhysicsBody *apBody);
	iPhysicsBody *GetBody(const tString &asName);
	cPhysicsBodyIterator GetBodyIterator();

	virtual iCharacterBody *CreateCharacterBody(const tString &asName, const cVector3f &avSize) = 0;
	void DestroyCharacterBody(iCharacterBody *apBody);
	iPhysicsBody *GetCharacterBody(const tString &asName);

	void GetBodiesInBV(cBoundingVolume *apBV, tPhysicsBodyList *apBodyList);
	void EnableBodiesInBV(cBoundingVolume *apBV, bool abEnabled);

	//! @}

	//########################################################################################
	//! \name Tools
	//########################################################################################
	//! @{

	void SetLogDebug(bool abX) { mbLogDebug = abX; }
	bool GetLogDebug() { return mbLogDebug; }

	void AddSaveData(cSaveDataHandler *apHandler);

	virtual iPhysicsController *CreateController(const tString &asName) = 0;
	void DestroyController(iPhysicsController *apController);

	tCollidePointVec *GetContactPoints() { return &mvContactPoints; }
	void SetSaveContactPoints(bool abX) { mbSaveContactPoints = abX; }
	bool GetSaveContactPoints() { return mbSaveContactPoints; }
	void RenderContactPoints(iLowLevelGraphics *apLowLevel, const cColor &aPointColor,
							 const cColor &aLineColor);

	virtual void CastRay(iPhysicsRayCallback *apCallback,
						 const cVector3f &avOrigin, const cVector3f &avEnd,
						 bool abCalcDist, bool abCalcNormal, bool abCalcPoint,
						 bool abUsePrefilter = false) = 0;

	virtual void RenderDebugGeometry(iLowLevelGraphics *apLowLevel, const cColor &aColor) = 0;

	virtual bool CheckShapeCollision(iCollideShape *apShapeA, const cMatrixf &a_mtxA,
									 iCollideShape *apShapeB, const cMatrixf &a_mtxB,
									 cCollideData &aCollideData, int alMaxPoints,
									 bool correctNormalDirection = false) = 0;

	bool CheckShapeWorldCollision(cVector3f *apNewPos,
								  iCollideShape *apShape, const cMatrixf &a_mtxTransform,
								  iPhysicsBody *apSkipBody = NULL, bool abSkipStatic = false,
								  bool abIsCharacter = false,
								  iPhysicsWorldCollisionCallback *apCallback = NULL,
								  bool abCollideCharacter = true,
								  bool abDebug = false);

	void DestroyAll();

	cWorld3D *GetWorld3D() { return mpWorld3D; }
	void SetWorld3D(cWorld3D *apWorld3D) { mpWorld3D = apWorld3D; }
	//! @}

protected:
	tCollideShapeList mlstShapes;
	tPhysicsBodyList mlstBodies;
	tCharacterBodyList mlstCharBodies;
	tPhysicsMaterialMap m_mapMaterials;
	tPhysicsJointList mlstJoints;
	tPhysicsControllerList mlstControllers;
	cWorld3D *mpWorld3D;

	bool mbLogDebug;

	tCollidePointVec mvContactPoints;
	bool mbSaveContactPoints;
};

} // namespace hpl

#endif // HPL_PHYSICS_WORLD_H