/*
 *   ORXONOX - the hottest 3D action shooter ever to exist
 *                    > www.orxonox.net <
 *
 *
 *   License notice:
 *
 *   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 2
 *   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, write to the Free Software
 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 *   Author:
 *      Baxissimo, Emmeran, DWORD, EtherDrive (OGRE Wiki)
 *   Co-authors:
 *      ...
 *
 */

#include "DynamicLines.h"

#include <cassert>
#include <cmath>

namespace Ogre
{
    enum
    {
        POSITION_BINDING,
        TEXCOORD_BINDING
    };

    DynamicLines::DynamicLines(OperationType opType)
    {
        initialize(opType,false);
        setMaterial("BaseWhiteNoLighting");
        mDirty = true;
    }

    DynamicLines::~DynamicLines()
    {
    }

    void DynamicLines::setOperationType(OperationType opType)
    {
        mRenderOp.operationType = opType;
    }

    RenderOperation::OperationType DynamicLines::getOperationType() const
    {
        return mRenderOp.operationType;
    }

    void DynamicLines::addPoint(const Vector3 &p)
    {
        mPoints.push_back(p);
        mDirty = true;
    }

    void DynamicLines::addPoint(Real x, Real y, Real z)
    {
        mPoints.emplace_back(x,y,z);
        mDirty = true;
    }

    const Vector3& DynamicLines::getPoint(unsigned short index) const
    {
        assert(index < mPoints.size() && "Point index is out of bounds!!");
        return mPoints[index];
    }

    unsigned short DynamicLines::getNumPoints(void) const
    {
        return (unsigned short)mPoints.size();
    }

    void DynamicLines::setPoint(unsigned short index, const Vector3 &value)
    {
        assert(index < mPoints.size() && "Point index is out of bounds!!");

        mPoints[index] = value;
        mDirty = true;
    }

    void DynamicLines::clear()
    {
        mPoints.clear();
        mDirty = true;
    }

    void DynamicLines::update()
    {
        if (mDirty)
            fillHardwareBuffers();
    }

    void DynamicLines::createVertexDeclaration()
    {
        VertexDeclaration *decl = mRenderOp.vertexData->vertexDeclaration;
        decl->addElement(POSITION_BINDING, 0, VET_FLOAT3, VES_POSITION);
    }

    void DynamicLines::fillHardwareBuffers()
    {
        int size = mPoints.size();

        prepareHardwareBuffers(size,0);

        if (!size)
        {
            mBox.setExtents(Vector3::ZERO,Vector3::ZERO);
            mDirty=false;
            return;
        }

        Vector3 vaabMin = mPoints[0];
        Vector3 vaabMax = mPoints[0];

        HardwareVertexBufferSharedPtr vbuf =
            mRenderOp.vertexData->vertexBufferBinding->getBuffer(0);

        Real *prPos = static_cast<Real*>(vbuf->lock(HardwareBuffer::HBL_DISCARD));
        for (int i = 0; i < size; i++)
        {
            *prPos++ = mPoints[i].x;
            *prPos++ = mPoints[i].y;
            *prPos++ = mPoints[i].z;

            if (mPoints[i].x < vaabMin.x)
                vaabMin.x = mPoints[i].x;
            if (mPoints[i].y < vaabMin.y)
                vaabMin.y = mPoints[i].y;
            if (mPoints[i].z < vaabMin.z)
                vaabMin.z = mPoints[i].z;

            if (mPoints[i].x > vaabMax.x)
                vaabMax.x = mPoints[i].x;
            if (mPoints[i].y > vaabMax.y)
                vaabMax.y = mPoints[i].y;
            if (mPoints[i].z > vaabMax.z)
                vaabMax.z = mPoints[i].z;
        }
        vbuf->unlock();

        mBox.setExtents(vaabMin, vaabMax);

        mDirty = false;
    }

    /*
    void DynamicLines::getWorldTransforms(Matrix4 *xform) const
    {
        // return identity matrix to prevent parent transforms
        *xform = Matrix4::IDENTITY;
    }
    */

    /*
    const Quaternion &DynamicLines::getWorldOrientation(void) const
    {
        return Quaternion::IDENTITY;
    }

    const Vector3 &DynamicLines::getWorldPosition(void) const
    {
        return Vector3::ZERO;
    }
    */
}