/*==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 plParticleEffect_inc
#define plParticleEffect_inc

#include "pnKeyedObject/hsKeyedObject.h"
#include "hsMatrix44.h"

class plEffectTargetInfo;
class plConvexVolume;
class hsResMgr;
class plSceneObject;

class plParticleEffect : public hsKeyedObject
{
public:
    CLASSNAME_REGISTER( plParticleEffect );
    GETINTERFACE_ANY( plParticleEffect, hsKeyedObject );

    // Order is:
    //  PrepareEffect is called with a given target (including valid
    //      ParticleContext).
    //  ApplyEffect is called some once for each particle (maybe zero times). 
    //      It can return true to kill a particle. 
    //      Target and Context passed in with Prepare will be
    //      guaranteed to remain valid until,
    //  EndEffect marks no more particles will be processed with the above
    //      context (invalidating anything cached).
    // Defaults for Prepare and End are no-ops.
    virtual void PrepareEffect(const plEffectTargetInfo& target) {}
    virtual hsBool ApplyEffect(const plEffectTargetInfo& target, Int32 i) = 0;
    virtual void EndEffect(const plEffectTargetInfo& target) {}
};

class plParticleCollisionEffect : public plParticleEffect
{
public:
    plParticleCollisionEffect();
    ~plParticleCollisionEffect();

    CLASSNAME_REGISTER( plParticleCollisionEffect );
    GETINTERFACE_ANY( plParticleCollisionEffect, plParticleEffect );

    virtual void PrepareEffect(const plEffectTargetInfo& target);

    virtual void Read(hsStream *s, hsResMgr *mgr);
    virtual void Write(hsStream *s, hsResMgr *mgr);
    virtual hsBool MsgReceive(plMessage *msg);

protected:
    plSceneObject *fSceneObj;
    plConvexVolume *fBounds;
};

// Default particle blocker. Doesn't affect particle's velocity,
// so it'll keep "beat"ing on the deflector until the velocity
// dotted with the deflector normal slides it off an edge.
class plParticleCollisionEffectBeat : public plParticleCollisionEffect
{
public:
    plParticleCollisionEffectBeat();

    CLASSNAME_REGISTER( plParticleCollisionEffectBeat );
    GETINTERFACE_ANY( plParticleCollisionEffectBeat, plParticleCollisionEffect );

    virtual hsBool ApplyEffect(const plEffectTargetInfo& target, Int32 i);
};

// This particle blocker just kills any particles that hit it.
class plParticleCollisionEffectDie : public plParticleCollisionEffect
{
public:
    plParticleCollisionEffectDie();

    CLASSNAME_REGISTER( plParticleCollisionEffectDie );
    GETINTERFACE_ANY( plParticleCollisionEffectDie, plParticleCollisionEffect );

    virtual hsBool ApplyEffect(const plEffectTargetInfo& target, Int32 i);
};

class plParticleCollisionEffectBounce : public plParticleCollisionEffect
{
protected:
    hsScalar    fBounce;
    hsScalar    fFriction;
public:
    plParticleCollisionEffectBounce();

    CLASSNAME_REGISTER( plParticleCollisionEffectBounce );
    GETINTERFACE_ANY( plParticleCollisionEffectBounce, plParticleCollisionEffect );

    virtual hsBool ApplyEffect(const plEffectTargetInfo& target, Int32 i);

    virtual void Read(hsStream *s, hsResMgr *mgr);
    virtual void Write(hsStream *s, hsResMgr *mgr);

    void SetBounce(hsScalar b) { fBounce = b; }
    hsScalar GetBounce() const { return fBounce; }

    void SetFriction(hsScalar f) { fFriction = f; }
    hsScalar GetFriction() const { return fFriction; }
};

class plParticleFadeVolumeEffect : public plParticleEffect
{
protected:
    // Some cached properties. These will be the same for all
    // particles between matching PrepareEffect and EndEffect calls.
    hsPoint3    fMax;
    hsPoint3    fMin;
    hsPoint3    fNorm;

public:
    plParticleFadeVolumeEffect();
    ~plParticleFadeVolumeEffect();

    CLASSNAME_REGISTER( plParticleFadeVolumeEffect );
    GETINTERFACE_ANY( plParticleFadeVolumeEffect, plParticleEffect );

    virtual void PrepareEffect(const plEffectTargetInfo& target);
    virtual hsBool ApplyEffect(const plEffectTargetInfo& target, Int32 i);

    virtual void Read(hsStream *s, hsResMgr *mgr);
    virtual void Write(hsStream *s, hsResMgr *mgr);
    //virtual hsBool MsgReceive(plMessage *msg);

    hsScalar fLength;
    hsBool fIgnoreZ;
};

class plParticleWindEffect : public plParticleEffect
{
protected:
    // The properties that define the wind. These might/should be animatable.
    hsScalar    fStrength;
    hsScalar    fConstancy;
    hsScalar    fSwirl;
    hsBool      fHorizontal;
    hsVector3   fRefDir;

    // Some cached properties. These will be the same for all
    // particles between matching PrepareEffect and EndEffect calls.
    // These define the current state of the wind.
    hsVector3   fWindVec;
    hsVector3   fRandDir;
    hsVector3   fDir;
    double      fLastDirSecs;
public:

    plParticleWindEffect();
    ~plParticleWindEffect();

    CLASSNAME_REGISTER( plParticleWindEffect );
    GETINTERFACE_ANY( plParticleWindEffect, plParticleEffect );

    virtual void PrepareEffect(const plEffectTargetInfo& target);
    virtual hsBool ApplyEffect(const plEffectTargetInfo& target, Int32 i) = 0;

    virtual void Read(hsStream *s, hsResMgr *mgr);
    virtual void Write(hsStream *s, hsResMgr *mgr);

    void                SetStrength(hsScalar v) { fStrength = v; }
    hsScalar            GetStrength() const { return fStrength; }

    void                SetConstancy(hsScalar c) { fConstancy = c; }
    hsScalar            GetConstancy() const { return fConstancy; }

    void                SetSwirl(hsScalar s) { fSwirl = s; }
    hsScalar            GetSwirl() const { return fSwirl; }

    void                SetHorizontal(hsBool on) { fHorizontal = on; }
    hsBool              GetHorizontal() const { return fHorizontal; }

    void                SetRefDirection(const hsVector3& v);
    const hsVector3&    GetRefDirection() const { return fRefDir; }
};

class plParticleLocalWind : public plParticleWindEffect
{
protected:
    hsVector3   fScale;
    hsScalar    fSpeed;

    hsVector3   fPhase;
    hsVector3   fInvScale;
    double      fLastPhaseSecs;
    
public:
    plParticleLocalWind();
    ~plParticleLocalWind();

    CLASSNAME_REGISTER( plParticleLocalWind );
    GETINTERFACE_ANY( plParticleLocalWind, plParticleWindEffect );

    virtual void PrepareEffect(const plEffectTargetInfo& target);
    virtual hsBool ApplyEffect(const plEffectTargetInfo& target, Int32 i);

    void                SetScale(const hsVector3& v) { fScale = v; }
    const hsVector3&    GetScale() const { return fScale; }

    void                SetSpeed(hsScalar v) { fSpeed = v; }
    hsScalar            GetSpeed() const { return fSpeed; }

    virtual void Read(hsStream *s, hsResMgr *mgr);
    virtual void Write(hsStream *s, hsResMgr *mgr);

};

class plParticleUniformWind : public plParticleWindEffect
{
protected:

    hsScalar    fFreqMin;
    hsScalar    fFreqMax;
    hsScalar    fFreqCurr;
    hsScalar    fFreqRate;
    double      fCurrPhase;

    double      fLastFreqSecs;

    hsScalar    fCurrentStrength;
public:
    plParticleUniformWind();
    ~plParticleUniformWind();

    CLASSNAME_REGISTER( plParticleUniformWind );
    GETINTERFACE_ANY( plParticleUniformWind, plParticleWindEffect );

    virtual void PrepareEffect(const plEffectTargetInfo& target);
    virtual hsBool ApplyEffect(const plEffectTargetInfo& target, Int32 i);

    void        SetFrequencyRange(hsScalar minSecsPerCycle, hsScalar maxSecsPerCycle);
    void        SetFrequencyRate(hsScalar secsPerCycle);

    virtual void Read(hsStream *s, hsResMgr *mgr);
    virtual void Write(hsStream *s, hsResMgr *mgr);

};

class plParticleInfluenceInfo
{
public:
    hsVector3 fAvgVel;
    hsVector3 fRepDir;
};

class plParticleFlockEffect : public plParticleEffect
{
//protected:
protected:
    hsPoint3 fTargetOffset;     // Worldspace offset from our target to get the true goal
    hsPoint3 fDissenterTarget;  // Where to particles go when they get scared and leave us?
    hsScalar fInfAvgRadSq;      // Square of the radius of influence for average velocity matching.
    hsScalar fInfRepRadSq;      // Same, for repelling from neighbors.
    hsScalar fAvgVelStr;        // How strongly are we influenced by average dir?
    hsScalar fRepDirStr;        // Same for repelling
    hsScalar fGoalOrbitStr;     // Same for the goal (when we're within the desired distance)
    hsScalar fGoalChaseStr;     // Same for the goal (when we're too far away, and chasing it)
    hsScalar fGoalDistSq;
    hsScalar fFullChaseDistSq;
    hsScalar fMaxOrbitSpeed;
    hsScalar fMaxChaseSpeed;

    UInt16 fMaxParticles;
    hsScalar *fDistSq;          // Table of distances from particle to particle
    plParticleInfluenceInfo *fInfluences; 

    void IUpdateDistances(const plEffectTargetInfo &target);
    void IUpdateInfluences(const plEffectTargetInfo &target);

public:
    plParticleFlockEffect();
    ~plParticleFlockEffect();

    CLASSNAME_REGISTER( plParticleFlockEffect );
    GETINTERFACE_ANY( plParticleFlockEffect, plParticleEffect );

    virtual void PrepareEffect(const plEffectTargetInfo& target);
    virtual hsBool ApplyEffect(const plEffectTargetInfo& target, Int32 i);  

    void SetTargetOffset(const hsPoint3 &offset) { fTargetOffset = offset; }
    void SetDissenterTarget(const hsPoint3 &target) { fDissenterTarget = target; }
    void SetInfluenceAvgRadius(hsScalar val) { fInfAvgRadSq = val * val; }
    void SetInfluenceRepelRadius(hsScalar val) { fInfRepRadSq = val * val; }
    void SetGoalRadius(hsScalar val) { fGoalDistSq = val * val; }
    void SetFullChaseRadius(hsScalar val) { fFullChaseDistSq = val * val; }
    void SetConformStr(hsScalar val) { fAvgVelStr = val; }
    void SetRepelStr(hsScalar val) { fRepDirStr = val; }
    void SetGoalOrbitStr(hsScalar val) { fGoalOrbitStr = val; }
    void SetGoalChaseStr(hsScalar val) { fGoalChaseStr = val; }
    void SetMaxOrbitSpeed(hsScalar val) { fMaxOrbitSpeed = val; }
    void SetMaxChaseSpeed(hsScalar val) { fMaxChaseSpeed = val; }
    void SetMaxParticles(UInt16 num);

    virtual void Read(hsStream *s, hsResMgr *mgr);
    virtual void Write(hsStream *s, hsResMgr *mgr);
    virtual hsBool MsgReceive(plMessage *msg);  
};  

class plParticleFollowSystemEffect : public plParticleEffect
{
public:
    CLASSNAME_REGISTER( plParticleFollowSystemEffect );
    GETINTERFACE_ANY( plParticleFollowSystemEffect, plParticleEffect );
    
    plParticleFollowSystemEffect();

    virtual void PrepareEffect(const plEffectTargetInfo& target);
    virtual hsBool ApplyEffect(const plEffectTargetInfo& target, Int32 i);
    virtual void EndEffect(const plEffectTargetInfo& target);
    
protected:
    hsMatrix44 fOldW2L;
    hsBool fEvalThisFrame;
};

#endif