/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
 *
 * 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.
*/
//osgManipulator - Copyright (C) 2007 Fugro-Jason B.V.

#ifndef OSGMANIPULATOR_DRAGGER
#define OSGMANIPULATOR_DRAGGER 1

#include <osgManipulator/Constraint>
#include <osgManipulator/Command>

#include <osg/BoundingSphere>
#include <osg/MatrixTransform>
#include <osgUtil/SceneView>
#include <osgUtil/IntersectVisitor>
#include <osgGA/GUIEventAdapter>
#include <osgGA/GUIActionAdapter>

namespace osgManipulator
{

class CompositeDragger;
class MotionCommand;
class TranslateInLineCommand;
class TranslateInPlaneCommand;
class Scale1DCommand;
class Scale2DCommand;
class ScaleUniformCommand;
class Rotate3DCommand;

/** Computes the nodepath from the given node all the way upto the root. */
extern OSGMANIPULATOR_EXPORT void computeNodePathToRoot(osg::Node& node, osg::NodePath& np);

class DraggerCallback : virtual public osg::Object
{
    public:
        DraggerCallback() {}
        DraggerCallback(const DraggerCallback&, const osg::CopyOp& copyop = osg::CopyOp::SHALLOW_COPY) {}

        META_Object(osgManipulator, DraggerCallback);

        /**
         * Receive motion commands. Returns true on success.
         */
        virtual bool receive(const MotionCommand&) { return false; }
        virtual bool receive(const TranslateInLineCommand& command)  { return receive((MotionCommand&)command); }
        virtual bool receive(const TranslateInPlaneCommand& command) { return receive((MotionCommand&)command); }
        virtual bool receive(const Scale1DCommand& command)          { return receive((MotionCommand&)command); }
        virtual bool receive(const Scale2DCommand& command)          { return receive((MotionCommand&)command); }
        virtual bool receive(const ScaleUniformCommand& command)     { return receive((MotionCommand&)command); }
        virtual bool receive(const Rotate3DCommand& command)         { return receive((MotionCommand&)command); }
};

class OSGMANIPULATOR_EXPORT DraggerTransformCallback : public DraggerCallback
{
    public:

        DraggerTransformCallback(osg::MatrixTransform* transform);

        virtual bool receive(const MotionCommand&);

        osg::MatrixTransform* getTransform() { return _transform.get(); }
        const osg::MatrixTransform* getTransform() const { return _transform.get(); }

    protected:

        osg::observer_ptr<osg::MatrixTransform> _transform;
        osg::Matrix _startMotionMatrix;

        osg::Matrix _localToWorld;
        osg::Matrix _worldToLocal;
};


class OSGMANIPULATOR_EXPORT PointerInfo
{
    public:

        PointerInfo();

        PointerInfo(const PointerInfo& rhs):
            _hitList(rhs._hitList),
            _nearPoint(rhs._nearPoint),
            _farPoint(rhs._farPoint),
            _eyeDir(rhs._eyeDir)
        {
            _hitIter = _hitList.begin();
        }

        void reset()
        {
            _hitList.clear();
            _hitIter = _hitList.begin();
            setCamera(0);
        }


        bool completed() const { return _hitIter==_hitList.end(); }

        void next()
        {
            if (!completed()) ++_hitIter;
        }

        typedef std::pair<osg::NodePath, osg::Vec3d> NodePathIntersectionPair;
        typedef std::list< NodePathIntersectionPair> IntersectionList;


        osg::Vec3d getLocalIntersectPoint() const { return _hitIter->second; }



        void setNearFarPoints (osg::Vec3d nearPoint, osg::Vec3d farPoint) {
            _nearPoint = nearPoint;
            _farPoint=farPoint;
            _eyeDir = farPoint - nearPoint;
        }

        const osg::Vec3d& getEyeDir() const {return _eyeDir;}

        void getNearFarPoints( osg::Vec3d& nearPoint, osg::Vec3d& farPoint) const {
            nearPoint = _nearPoint;
            farPoint = _farPoint;
        }

        bool contains(const osg::Node* node) const;

        void setCamera(osg::Camera* camera)
        {

            if (camera)
            {
                _MVPW = camera->getViewMatrix() * camera->getProjectionMatrix();
                if (camera->getViewport()) _MVPW.postMult(camera->getViewport()->computeWindowMatrix());
                _inverseMVPW.invert(_MVPW);
                osg::Vec3d eye, center, up;
                camera->getViewMatrix().getLookAt(eye, center, up);
                _eyeDir = eye - center;

            }
            else
            {
                _MVPW.makeIdentity();
                _inverseMVPW.makeIdentity();
                _eyeDir = osg::Vec3d(0,0,1);
            }

        }

        void addIntersection(const osg::NodePath& nodePath, const osg::Vec3d& intersectionPoint)
        {
            bool needToResetHitIter = _hitList.empty();
            _hitList.push_back(NodePathIntersectionPair(nodePath, intersectionPoint));
            if (needToResetHitIter) _hitIter = _hitList.begin();
        }

        void setMousePosition(float pixel_x, float pixel_y)
        {
            projectWindowXYIntoObject(osg::Vec2d(pixel_x, pixel_y), _nearPoint, _farPoint);
        }

    protected:
        bool projectWindowXYIntoObject(const osg::Vec2d& windowCoord, osg::Vec3d& nearPoint, osg::Vec3d& farPoint) const;

    public:
        IntersectionList _hitList;
        IntersectionList::const_iterator _hitIter;

    protected:

        osg::Vec3d _nearPoint,_farPoint;
        osg::Vec3d _eyeDir;

        osg::Matrix _MVPW;
        osg::Matrix _inverseMVPW;

};

/**
 * Base class for draggers. Concrete draggers implement the pick event handler
 * and generate motion commands (translate, rotate, ...) and sends these
 * command to all the DraggerCallbacks & Transforms that are connected to the Dragger that generates the
 * commands.
 */
class OSGMANIPULATOR_EXPORT Dragger : public osg::MatrixTransform
{
    public:


        META_Node(osgManipulator,Dragger)

        /**
         * Set/Get parent dragger. For simple draggers parent points to itself.
         * For composite draggers parent points to the parent dragger that uses
         * this dragger.
         */
        virtual void setParentDragger(Dragger* parent) { _parentDragger = parent; }
        Dragger* getParentDragger() { return _parentDragger; }
        const Dragger* getParentDragger() const { return _parentDragger; }

        /** Returns 0 if this Dragger is not a CompositeDragger. */
        virtual const CompositeDragger* getComposite() const { return 0; }

        /** Returns 0 if this Dragger is not a CompositeDragger. */
        virtual CompositeDragger* getComposite() { return 0; }


        void setHandleEvents(bool flag);
        bool getHandleEvents() const { return _handleEvents; }

        void setActivationModKeyMask(unsigned int mask) { _activationModKeyMask = mask; }
        unsigned int getActivationModKeyMask() const { return _activationModKeyMask; }

        void setActivationKeyEvent(int key) { _activationKeyEvent = key; }
        int getActivationKeyEvent() const { return _activationKeyEvent; }


        virtual void traverse(osg::NodeVisitor& nv);

        virtual bool handle(const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter& aa);
        virtual bool handle(const PointerInfo&, const osgGA::GUIEventAdapter&, osgGA::GUIActionAdapter&) { return false; }


        typedef std::vector< osg::ref_ptr<Constraint> > Constraints;

        void addConstraint(Constraint* constraint);
        void removeConstraint(Constraint* constraint);

        Constraints& getConstraints() { return _constraints; }
        const Constraints& getConstraints() const { return _constraints; }


        typedef std::vector< osg::ref_ptr<DraggerCallback> > DraggerCallbacks;

        void addDraggerCallback(DraggerCallback* dc);
        void removeDraggerCallback(DraggerCallback* dc);

        DraggerCallbacks& getDraggerCallbacks() { return _draggerCallbacks; }
        const DraggerCallbacks& getDraggerCallbacks() const { return _draggerCallbacks; }

        void addTransformUpdating(MatrixTransform* transform);
        void removeTransformUpdating(MatrixTransform* transform);

        /** Setup default geometry for dragger. */
        virtual void setupDefaultGeometry() {}

        virtual bool receive(const MotionCommand& command);
        void dispatch(MotionCommand& command);

        void setDraggerActive(bool active) { _draggerActive = active; }
        bool getDraggerActive() const { return _draggerActive; }

    protected:

        Dragger();
        Dragger(const Dragger& rhs, const osg::CopyOp& copyop = osg::CopyOp::SHALLOW_COPY);

        virtual ~Dragger();


        bool                            _handleEvents;
        bool                            _draggerActive;

        unsigned int                    _activationModKeyMask;
        int                             _activationKeyEvent;
        bool                            _activationPermittedByModKeyMask;
        bool                            _activationPermittedByKeyEvent;

        osgManipulator::PointerInfo     _pointer;

        Dragger*                        _parentDragger;

        osg::ref_ptr<DraggerCallback>   _selfUpdater;
        Constraints                     _constraints;
        DraggerCallbacks                _draggerCallbacks;

};


/**
 * CompositeDragger allows to create complex draggers that are composed of a
 * hierarchy of Draggers.
 */
class OSGMANIPULATOR_EXPORT CompositeDragger : public Dragger
{
    public:

        META_Node(osgManipulator,CompositeDragger)

        typedef std::vector< osg::ref_ptr<Dragger> > DraggerList;

        virtual const CompositeDragger* getComposite() const { return this; }
        virtual CompositeDragger* getComposite() { return this; }

        virtual void setParentDragger(Dragger* parent);

        virtual bool handle(const PointerInfo& pi, const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter& aa);

        // Composite-specific methods below
        virtual bool addDragger(Dragger* dragger);
        virtual bool removeDragger(Dragger* dragger);
        unsigned int getNumDraggers() const { return _draggerList.size(); }
        Dragger* getDragger(unsigned int i) { return _draggerList[i].get(); }
        const Dragger* getDragger(unsigned int i) const { return _draggerList[i].get(); }
        bool containsDragger(const Dragger* dragger) const;
        DraggerList::iterator findDragger(const Dragger* dragger);

    protected:

        CompositeDragger() {}
        CompositeDragger(const CompositeDragger& rhs, const osg::CopyOp& copyop = osg::CopyOp::SHALLOW_COPY);

        virtual ~CompositeDragger() {}

        DraggerList _draggerList;
};

/**
 * Culls the drawable all the time. Used by draggers to have invisible geometry
 * around lines and points so that they can be picked. For example, a dragger
 * could have a line with an invisible cylinder around it to enable picking on
 * that line.
 */
void OSGMANIPULATOR_EXPORT setDrawableToAlwaysCull(osg::Drawable& drawable);

/**
 * Convenience function for setting the material color on a node.
 */
void OSGMANIPULATOR_EXPORT setMaterialColor(const osg::Vec4& color, osg::Node& node);

}

#endif