/*  -*-c++-*- 
 *  Copyright (C) 2008 Cedric Pinson <mornifle@plopbyte.net>
 *
 * This library is open source and may be redistributed and/or modified under  
 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or 
 * (at your option) any later version.  The full license is in LICENSE file
 * included with this distribution, and on the openscenegraph.org website.
 * 
 * This library 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 
 * OpenSceneGraph Public License for more details.
*/

#ifndef OSGANIMATION_RIGGEOMETRY_H
#define OSGANIMATION_RIGGEOMETRY_H

#include <osgAnimation/Export>
#include <osgAnimation/Skinning>
#include <osgAnimation/Skeleton>
#include <osg/Geometry>

namespace osgAnimation 
{

    class OSGANIMATION_EXPORT RigGeometry : public osg::Geometry
    {
    public:

        RigGeometry();
        RigGeometry(const osg::Geometry& b);
        RigGeometry(const RigGeometry& b, const osg::CopyOp& copyop = osg::CopyOp::SHALLOW_COPY);

        META_Object(osgAnimation, RigGeometry);

        void setInfluenceMap(osgAnimation::VertexInfluenceMap* vertexInfluenceMap) { _vertexInfluenceMap = vertexInfluenceMap; }
        const osgAnimation::VertexInfluenceMap* getInfluenceMap() const { return _vertexInfluenceMap.get();}
        osgAnimation::VertexInfluenceMap* getInfluenceMap() { return _vertexInfluenceMap.get();}
 
        const Skeleton* getSkeleton() const;
        Skeleton* getSkeleton();
        
        void setNeedToComputeMatrix(bool state) { _needToComputeMatrix = state;}
        bool getNeedToComputeMatrix() const { return _needToComputeMatrix;}
        
        void buildVertexSet();
        void buildTransformer(Skeleton* root);
        void computeMatrixFromRootSkeleton();

        virtual void transformSoftwareMethod();
        const osgAnimation::VertexInfluenceSet& getVertexInfluenceSet() const { return _vertexInfluenceSet;}

        const std::vector<osg::Vec3>& getPositionSource() const { return _positionSource;}
        const std::vector<osg::Vec3>& getNormalSource() const { return _normalSource;}

    protected:

        std::vector<osg::Vec3> _positionSource;
        std::vector<osg::Vec3> _normalSource;

        osgAnimation::VertexInfluenceSet _vertexInfluenceSet;
        osg::ref_ptr<osgAnimation::VertexInfluenceMap> _vertexInfluenceMap;
        osgAnimation::TransformVertexFunctor _transformVertexes;

        osg::Matrix _matrixFromSkeletonToGeometry;
        osg::Matrix _invMatrixFromSkeletonToGeometry;
        osg::observer_ptr<Skeleton> _root;
        bool _needToComputeMatrix;

 
        struct FindNearestParentSkeleton : public osg::NodeVisitor
        {
            osg::ref_ptr<osgAnimation::Skeleton> _root;
            FindNearestParentSkeleton() : osg::NodeVisitor(osg::NodeVisitor::TRAVERSE_PARENTS) {}
            void apply(osg::Transform& node) 
            {
                if (_root.valid())
                    return;
                _root = dynamic_cast<osgAnimation::Skeleton*>(&node);
                traverse(node);
            }
        };


        struct UpdateVertex : public osg::Drawable::UpdateCallback
        {
            virtual void update(osg::NodeVisitor*, osg::Drawable* drw)
            {
                RigGeometry* geom = dynamic_cast<RigGeometry*>(drw);
                if (!geom)
                    return;
                if (!geom->getSkeleton() && !geom->getParents().empty())
                {
                    FindNearestParentSkeleton finder;
                    if (geom->getParents().size() > 1)
                        osg::notify(osg::WARN) << "A RigGeometry should not have multi parent ( " << geom->getName() << " )" << std::endl;
                    geom->getParents()[0]->accept(finder);

                    if (!finder._root.valid())
                        return;
                    geom->buildVertexSet();
                    geom->buildTransformer(finder._root.get());
                }

                if (!geom->getSkeleton())
                    return;

                if (geom->getNeedToComputeMatrix())
                    geom->computeMatrixFromRootSkeleton();
                geom->transformSoftwareMethod();
            }
        };

        /** BuildVertexTransformerVisitor is used to setup RigGeometry drawable
         *  throw a subgraph. 
         */
        struct BuildVertexTransformerVisitor : public osg::NodeVisitor
        {
            osg::ref_ptr<Skeleton> _root;
            BuildVertexTransformerVisitor(Skeleton* root): osg::NodeVisitor(osg::NodeVisitor::TRAVERSE_ALL_CHILDREN) { _root = root;}

            META_NodeVisitor("osgAnimation","BuildVertexTransformerVisitor")

            void apply(osg::Geode& node) 
            { 
                int num = node.getNumDrawables();
                for (int i = 0; i < num; i++) {
                    RigGeometry* geom = dynamic_cast<RigGeometry*>(node.getDrawable(i));
                    if (geom) 
                    {
                        geom->buildVertexSet();
                        geom->buildTransformer(_root.get());
                    }
                }
            }
        };

   };

}

#endif