/*==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/>.

You can contact Cyan Worlds, Inc. by email legal@cyan.com
 or by snail mail at:
      Cyan Worlds, Inc.
      14617 N Newport Hwy
      Mead, WA   99021

*==LICENSE==*/

#include "hsTypes.h"
#include "plDynaWakeMgr.h"
#include "plDynaDecal.h"

#include "plPrintShape.h"

#include "plCutter.h"

#include "plgDispatch.h"

#include "hsStream.h"
#include "hsResMgr.h"
#include "hsTimer.h"

#include "plMessage/plDynaDecalEnableMsg.h"
#include "plMessage/plRippleShapeMsg.h"

#include "plMessage/plAvatarMsg.h"
#include "plAvatar/plAvBrainHuman.h"
#include "plAvatar/plArmatureMod.h"

#include "plInterp/plAnimPath.h"

#include "hsFastMath.h"
#include "plMath/plRandom.h"
static plRandom sRand;


int plDynaWakeMgr::INewDecal()
{
    int idx = fDecals.GetCount();

    plDynaWake* wake = TRACKED_NEW plDynaWake();
    wake->fC1U = fInitUVW.fX;
    wake->fC2U = (fInitUVW.fX - fFinalUVW.fX) / (fLifeSpan * fFinalUVW.fX);

    wake->fC1V = fInitUVW.fY;
    wake->fC2V = (fInitUVW.fY - fFinalUVW.fY) / (fLifeSpan * fFinalUVW.fY);

    fDecals.Append(wake);

    return idx;
}

plDynaWakeMgr::plDynaWakeMgr()
:
    fAnimPath(nil),
    fDefaultDir(0.f, 1.f, 0.f),
    fAnimWgt(0),
    fVelWgt(1.f)
{
}

plDynaWakeMgr::~plDynaWakeMgr()
{
    delete fAnimPath;
}

void plDynaWakeMgr::SetAnimPath(plAnimPath* a)
{
    delete fAnimPath;
    fAnimPath = a;
}

void plDynaWakeMgr::SetDefaultDir(const hsVector3& v)
{
    fDefaultDir = v;
    hsFastMath::Normalize(fDefaultDir);
}

void plDynaWakeMgr::Read(hsStream* stream, hsResMgr* mgr)
{
    plDynaRippleMgr::Read(stream, mgr);

    fDefaultDir.Read(stream);
    fAnimPath = plAnimPath::ConvertNoRef(mgr->ReadCreatable(stream));

    fAnimWgt = stream->ReadSwapScalar();
    fVelWgt = stream->ReadSwapScalar();
}

void plDynaWakeMgr::Write(hsStream* stream, hsResMgr* mgr)
{
    plDynaRippleMgr::Write(stream, mgr);

    fDefaultDir.Write(stream);
    mgr->WriteCreatable(stream, fAnimPath);

    stream->WriteSwapScalar(fAnimWgt);
    stream->WriteSwapScalar(fVelWgt);
}

hsVector3 plDynaWakeMgr::IGetDirection(const plDynaDecalInfo& info, const hsPoint3& pos) const
{
    hsVector3 dir = fDefaultDir;
    // If we have an animpath, figure a direction based on position here
    if( fAnimPath )
    {
        hsVector3 animDir;
        hsPoint3 p = pos;
        hsScalar t = fAnimPath->GetExtremePoint(p);
        fAnimPath->SetCurTime(t, plAnimPath::kNone);

        fAnimPath->GetVelocity(&animDir);

        animDir *= fAnimWgt;

        dir += animDir;
    }

    // Now if we want to factor in velocity, we can use (pos - info.fLastPos) / (hsTimer::GetSysSeconds() - info.fLastTime)
    hsScalar dt = hsScalar(hsTimer::GetSysSeconds() - info.fLastTime);
    const hsScalar kMinDt = 1.e-3f;
    if( (info.fFlags & plDynaDecalInfo::kImmersed) && (dt > kMinDt) )
    {
        hsVector3 velDir(&pos, &info.fLastPos);

        velDir *= 1.f / dt * fVelWgt;

        dir += velDir;
    }
    hsFastMath::Normalize(dir);

    return dir;
}

hsBool plDynaWakeMgr::IRippleFromShape(const plPrintShape* shape, hsBool force)
{
    if( !shape )
        return false;

    hsBool retVal = false;

    plDynaDecalInfo& info = IGetDecalInfo(UInt32(shape), shape->GetKey());

    const hsMatrix44& shapeL2W = shape->GetOwner()->GetLocalToWorld();

    static hsScalar kMinDist = 1.0f;
    static hsScalar kMinTime = 0.25f;
    double t = hsTimer::GetSysSeconds();
    hsScalar dt = hsScalar(t - info.fLastTime) * sRand.RandZeroToOne();
    hsBool longEnough = (dt >= kMinTime);
    hsBool farEnough = (hsVector3(&info.fLastPos, &shapeL2W.GetTranslate()).Magnitude() > kMinDist);
    if( force || longEnough || farEnough )
    {
        hsPoint3 pos = shapeL2W.GetTranslate();

        // Base the direction on the unperturbed pos.
        hsVector3 dir = IGetDirection(info, pos);

        // We'll perturb the position a little so it doesn't look quite so regular,
        // but we perturb it more if we're just standing still
        hsVector3 randPert(sRand.RandMinusOneToOne(), sRand.RandMinusOneToOne(), 0);
        randPert.Normalize();
        if( !farEnough )
        {
            static hsScalar kRandPert = 0.05f;
            randPert *= kRandPert * shape->GetWidth();
        }
        else
        {
            static hsScalar kRandPert = 0.05f;
            randPert *= kRandPert * shape->GetWidth();
        }
        pos += randPert;

        hsVector3 up(0.f, 0.f, 1.f);

        static hsScalar kHeightScale = 1.f;
        pos.fZ += (shape->GetHeight() * fScale.fZ * kHeightScale) * 0.25f;

        pos += dir * shape->GetLength() * 0.5f * (1.f - fScale.fY);

        hsVector3 size(shape->GetWidth() * fScale.fX, shape->GetLength() * fScale.fY, shape->GetHeight() * fScale.fZ * kHeightScale);
        fCutter->SetLength(size);
        fCutter->Set(pos, dir, up);

        info.fLastTime = t;
        info.fLastPos = shapeL2W.GetTranslate();

        hsBool hit = ICutoutTargets(t);
        if( hit )
            retVal = true;
    }
    return retVal;
}