/*==LICENSE==*

CyanWorlds.com Engine - MMOG client, server and tools
Copyright (C) 2011  Cyan Worlds, Inc.

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/>.

Additional permissions under GNU GPL version 3 section 7

If you modify this Program, or any covered work, by linking or
combining it with any of RAD Game Tools Bink SDK, Autodesk 3ds Max SDK,
NVIDIA PhysX SDK, Microsoft DirectX SDK, OpenSSL library, Independent
JPEG Group JPEG library, Microsoft Windows Media SDK, or Apple QuickTime SDK
(or a modified version of those libraries),
containing parts covered by the terms of the Bink SDK EULA, 3ds Max EULA,
PhysX SDK EULA, DirectX SDK EULA, OpenSSL and SSLeay licenses, IJG
JPEG Library README, Windows Media SDK EULA, or QuickTime SDK EULA, the
licensors of this Program grant you additional
permission to convey the resulting work. Corresponding Source for a
non-source form of such a combination shall include the source code for
the parts of OpenSSL and IJG JPEG Library used as well as that of the covered
work.

You can contact Cyan Worlds, Inc. by email legal@cyan.com
 or by snail mail at:
      Cyan Worlds, Inc.
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*==LICENSE==*/
#ifndef PLPHYSICALCONTROLLERCORE_H
#define PLPHYSICALCONTROLLERCORE_H

#include "hsGeometry3.h"
#include "hsMatrix44.h"
#include "hsQuat.h"
#include "hsTemplates.h"
#include "pnKeyedObject/plKey.h"
#include "plPhysical/plSimDefs.h"
#include <vector>

class plCoordinateInterface;
class plPhysical;
class plMovementStrategy;
class plAGApplicator;
class plSwimRegionInterface;

#define kSlopeLimit (cosf(hsDegreesToRadians(55.f)))

enum plControllerCollisionFlags
{
    kSides = 1,
    kTop = (1 << 1),
    kBottom = (1 << 2)
};

struct plControllerSweepRecord
{
    plPhysical *ObjHit;
    hsPoint3 Point;
    hsVector3 Normal;
};

class plPhysicalControllerCore
{
public:
    plPhysicalControllerCore(plKey ownerSceneObject, float height, float radius);
    virtual ~plPhysicalControllerCore() { }

    // An ArmatureMod has its own idea about when physics should be enabled/disabled.
    // Use plArmatureModBase::EnablePhysics() instead.
    virtual void Enable(bool enable) = 0;
    virtual bool IsEnabled() { return fEnabled; }

    // Subworld
    virtual plKey GetSubworld() { return fWorldKey; }
    virtual void SetSubworld(plKey world) = 0;
    virtual const plCoordinateInterface* GetSubworldCI();

    // For the avatar SDL only
    virtual void GetState(hsPoint3& pos, float& zRot) = 0;
    virtual void SetState(const hsPoint3& pos, float zRot) = 0;

    // The LOS DB this avatar is in (only one)
    virtual plSimDefs::plLOSDB GetLOSDB() { return fLOSDB; }
    virtual void SetLOSDB(plSimDefs::plLOSDB losDB) { fLOSDB = losDB; }

    // Movement strategy
    virtual void SetMovementStrategy(plMovementStrategy* strategy) = 0;

    // Global location
    virtual const hsMatrix44& GetLastGlobalLoc() { return fLastGlobalLoc; }
    virtual void SetGlobalLoc(const hsMatrix44& l2w) = 0;

    // Local sim position
    virtual void GetPositionSim(hsPoint3& pos) = 0;

    // Move kinematic controller
    virtual void Move(hsVector3 displacement, unsigned int collideWith, unsigned int &collisionResults) = 0;

    // Set linear velocity on dynamic controller
    virtual void SetLinearVelocitySim(const hsVector3& linearVel) = 0;

    // Sweep the controller path from startPos through endPos
    virtual int SweepControllerPath(const hsPoint3& startPos,const hsPoint3& endPos, bool vsDynamics, bool vsStatics,
        uint32_t& vsSimGroups, std::vector<plControllerSweepRecord>& hits) = 0;

    // any clean up for the controller should go here
    virtual void LeaveAge() = 0;

    // Local rotation
    const hsQuat& GetLocalRotation() const { return fLocalRotation; }
    void IncrementAngle(float deltaAngle);

    // Linear velocity
    void SetLinearVelocity(const hsVector3& linearVel) { fLinearVelocity = linearVel; }
    const hsVector3& GetLinearVelocity() const { return fLinearVelocity; }

    // Acheived linear velocity
    const hsVector3& GetAchievedLinearVelocity() const { return fAchievedLinearVelocity; }
    void OverrideAchievedLinearVelocity(const hsVector3& linearVel) { fAchievedLinearVelocity = linearVel; }
    void ResetAchievedLinearVelocity() { fAchievedLinearVelocity.Set(0.f, 0.f, 0.f); }

    // SceneObject
    plKey GetOwner() { return fOwner; }

    // When seeking no longer want to interact with exclude regions
    void SetSeek(bool seek) { fSeeking = seek; }
    bool IsSeeking() const { return fSeeking; }

    // Pushing physical
    plPhysical* GetPushingPhysical() const { return fPushingPhysical; }
    void SetPushingPhysical(plPhysical* phys) { fPushingPhysical = phys; }
    bool GetFacingPushingPhysical() const { return fFacingPushingPhysical; }
    void SetFacingPushingPhysical(bool facing) { fFacingPushingPhysical = facing; }

    // Controller dimensions
    float GetRadius() const { return fRadius; }
    float GetHeight() const { return fHeight; }

    // Create a new controller instance - Implemented in the physics system
    static plPhysicalControllerCore* Create(plKey ownerSO, float height, float radius, bool human);

protected:
    virtual void IHandleEnableChanged() = 0;

    void IApply(float delSecs);
    void IUpdate(int numSubSteps, float alpha);
    void IUpdateNonPhysical(float alpha);

    void ISendCorrectionMessages(bool dirtySynch = false);

    plKey fOwner;
    plKey fWorldKey;

    float fHeight;
    float fRadius;

    plSimDefs::plLOSDB fLOSDB;

    plMovementStrategy* fMovementStrategy;

    float fSimLength;

    hsQuat fLocalRotation;
    hsPoint3 fLocalPosition;
    hsPoint3 fLastLocalPosition;

    hsMatrix44 fLastGlobalLoc;
    hsMatrix44 fPrevSubworldW2L;

    hsVector3 fLinearVelocity;
    hsVector3 fAchievedLinearVelocity;

    plPhysical* fPushingPhysical;
    bool fFacingPushingPhysical;

    bool fSeeking;
    bool fEnabled;
    bool fEnableChanged;
};

class plMovementStrategy
{
public:
    plMovementStrategy(plPhysicalControllerCore* controller);
    virtual ~plMovementStrategy() { }

    virtual void Apply(float delSecs) = 0;
    virtual void Update(float delSecs) { }

    virtual void AddContactNormals(hsVector3& vec) { }
    virtual void Reset(bool newAge);
    virtual bool IsKinematic() { return true; }

protected:
    plPhysicalControllerCore* fController;
};

class plAnimatedMovementStrategy : public plMovementStrategy
{
public:
    plAnimatedMovementStrategy(plAGApplicator* rootApp, plPhysicalControllerCore* controller);
    virtual ~plAnimatedMovementStrategy() { }

    virtual void RecalcVelocity(double timeNow, float elapsed, bool useAnim = true);
    void SetTurnStrength(float val) { fTurnStr = val; }
    float GetTurnStrength() const { return fTurnStr; }

private:
    void IRecalcLinearVelocity(float elapsed, hsMatrix44 &prevMat, hsMatrix44 &curMat);
    void IRecalcAngularVelocity(float elapsed, hsMatrix44 &prevMat, hsMatrix44 &curMat);

    plAGApplicator* fRootApp;
    hsVector3	fAnimLinearVel;
    float	fAnimAngularVel;
    float	fTurnStr;
};

class plWalkingStrategy : public plAnimatedMovementStrategy
{
public:
    plWalkingStrategy(plAGApplicator* rootApp, plPhysicalControllerCore* controller);
    virtual ~plWalkingStrategy() { }

    virtual void Apply(float delSecs);
    virtual void Update(float delSecs);

    virtual void AddContactNormals(hsVector3& vec);
    virtual void Reset(bool newAge);

    virtual void RecalcVelocity(double timeNow, float elapsed, bool useAnim = true);

    bool HitGroundInThisAge() const { return fHitGroundInThisAge; }
    bool IsOnGround() const { return fTimeInAir < kAirTimeThreshold || fFalseGround; }

    float GetAirTime() const { return fTimeInAir; }
    void ResetAirTime() { fTimeInAir = 0.0f; }

    float GetImpactTime() const { return fImpactTime; }
    const hsVector3& GetImpactVelocity() const { return fImpactVelocity; }

    bool EnableControlledFlight(bool status);
    bool IsControlledFlight() const { return fControlledFlight != 0; }

    plPhysical* GetPushingPhysical() const;
    bool GetFacingPushingPhysical() const;

protected:
    static const float kAirTimeThreshold;
    static const float kControlledFlightThreshold;

    hsTArray<hsVector3> fSlidingNormals;

    hsVector3 fImpactVelocity;
    float fImpactTime;

    float fTimeInAir;

    float fControlledFlightTime;
    int fControlledFlight;

    bool fGroundHit;
    bool fFalseGround;
    bool fHeadHit;
    bool fSliding;

    bool fClearImpact;
    bool fHitGroundInThisAge;
};

class plSwimStrategy : public plAnimatedMovementStrategy
{
public:
    plSwimStrategy(plAGApplicator* rootApp, plPhysicalControllerCore* controller);
    virtual ~plSwimStrategy() { }

    virtual void Apply(float delSecs);

    virtual void AddContactNormals(hsVector3& vec);

    void SetSurface(plSwimRegionInterface* region, float surfaceHeight);

    float GetBuoyancy() const { return fBuoyancy; }
    bool IsOnGround() const { return fOnGround; }
    bool HadContacts() const { return fHadContacts; }

protected:
    void IAdjustBuoyancy();

    float fBuoyancy;
    float fSurfaceHeight;

    plSwimRegionInterface *fCurrentRegion;

    bool fOnGround;
    bool fHadContacts;
};

class plDynamicWalkingStrategy : public plWalkingStrategy
{
public:
    plDynamicWalkingStrategy(plAGApplicator* rootApp, plPhysicalControllerCore* controller);
    virtual ~plDynamicWalkingStrategy() { }

    virtual void Apply(float delSecs);

    virtual bool IsKinematic() { return false; }

protected:
    bool ICheckForGround(float& zVelocity);
};

#endif// PLPHYSICALCONTROLLERCORE_H