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//
// Copyright (c) 2009-2012,
//  Sony Pictures Imageworks Inc. and
//  Industrial Light & Magic, a division of Lucasfilm Entertainment Company Ltd.
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#include "MayaPointPrimitiveWriter.h"
#include "MayaUtility.h"

MayaPointPrimitiveWriter::MayaPointPrimitiveWriter(
    double iFrame, MDagPath & iDag, Alembic::AbcGeom::OObject & iParent,
    Alembic::Util::uint32_t iTimeIndex,
    const JobArgs & iArgs) :
    mIsAnimated(false), mDagPath(iDag)
{
    MFnParticleSystem particle(mDagPath);
    MString name = particle.name();

    name = util::stripNamespaces(name, iArgs.stripNamespace);

    Alembic::AbcGeom::OPoints obj(iParent, name.asChar(),
        iTimeIndex);
    mSchema = obj.getSchema();

    Alembic::Abc::OCompoundProperty cp;
    Alembic::Abc::OCompoundProperty up;
    if (AttributesWriter::hasAnyAttr(particle, iArgs))
    {
        cp = mSchema.getArbGeomParams();
        up = mSchema.getUserProperties();
    }

    mAttrs = AttributesWriterPtr(new AttributesWriter(cp, up, obj, particle,
        iTimeIndex, iArgs));

    MObject object = iDag.node();
    if (iTimeIndex != 0 && util::isAnimated(object))
        mIsAnimated = true;

    write(iFrame);
}

void MayaPointPrimitiveWriter::write(double iFrame)
{
    std::vector<float> position;
    std::vector<float> velocity;
    std::vector< Alembic::Util::uint64_t > particleIds;
    std::vector<float> width;

    bool runupFromStart = false;
    MTime to(iFrame, MTime::kSeconds);

    // need to force re-evaluation
    MFnParticleSystem particle(mDagPath);
    particle.evaluateDynamics(to, runupFromStart);

    unsigned int size = particle.count();

    Alembic::AbcGeom::OPointsSchema::Sample samp;

    if (size == 0)
    {
        samp.setPositions(Alembic::Abc::V3fArraySample(NULL, 0));
        samp.setVelocities(Alembic::Abc::V3fArraySample(NULL, 0));
        samp.setIds(Alembic::Abc::UInt64ArraySample(NULL, 0));

        mSchema.set(samp);
        return;
    }

    position.reserve(size*3);
    velocity.reserve(size*3);
    particleIds.reserve(size);
    width.reserve(size);

    // get particle position
    MVectorArray posArray;
    particle.position(posArray);
    for (unsigned int i = 0; i < size; i++)
    {
        MVector vec = posArray[i];
        position.push_back(static_cast<float>(vec.x));
        position.push_back(static_cast<float>(vec.y));
        position.push_back(static_cast<float>(vec.z));
    }
    samp.setPositions(
        Alembic::Abc::V3fArraySample((const Imath::V3f *) &position.front(),
            position.size() / 3) );

    // get particle velocity
    MVectorArray vecArray;
    particle.velocity(vecArray);
    for (unsigned int i = 0; i < size; i++)
    {
        MVector vec = vecArray[i];
        velocity.push_back(static_cast<float>(vec.x));
        velocity.push_back(static_cast<float>(vec.y));
        velocity.push_back(static_cast<float>(vec.z));
    }
    if (!velocity.empty())
    {
        samp.setVelocities(
            Alembic::Abc::V3fArraySample((const Imath::V3f *) &velocity.front(),
                velocity.size() / 3) );
    }

    // get particleIds
    MIntArray idArray;
    particle.particleIds(idArray);
    for (unsigned int i = 0; i < size; i++)
    {
        particleIds.push_back(idArray[i]);
    }
    samp.setIds(
        Alembic::Abc::UInt64ArraySample(&(particleIds.front()),
            particleIds.size()) );

    // assume radius is width
    MDoubleArray radiusArray;
    particle.radius(radiusArray);

    for (unsigned int i = 0; i < size; i++)
    {
        float radius = static_cast<float>(radiusArray[i]);
        width.push_back(radius);
    }

    // ignoring width and the velocity vectors for now
    mSchema.set(samp);
}

unsigned int MayaPointPrimitiveWriter::getNumCVs()
{
    MFnParticleSystem particle(mDagPath);
    return particle.count();
}

bool MayaPointPrimitiveWriter::isAnimated() const
{
    return  mIsAnimated;
}