/* -*-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/Selection>

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

namespace osgManipulator
{

class CommandManager;
class CompositeDragger;

/**
 * Base class for draggers. Concrete draggers implement the pick event handler
 * and generate motion commands (translate, rotate, ...) and sends these 
 * command to the CommandManager. The CommandManager dispatches the commands 
 * to all the Selections that are connected to the Dragger that generates the
 * commands.
 */
class OSGMANIPULATOR_EXPORT Dragger : public Selection
{
    public:

        /** Set/Get the CommandManager. Draggers use CommandManager to dispatch commands. */
        virtual void setCommandManager(CommandManager* cm) { _commandManager = cm; }
        CommandManager* getCommandManager() { return _commandManager; }
        const CommandManager* getCommandManager() const { return _commandManager; }

        /**
	 * 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; }
        
        struct OSGMANIPULATOR_EXPORT PointerInfo
        {
            PointerInfo();

            PointerInfo(const PointerInfo& rhs):
                pixel_x(rhs.pixel_x),
                pixel_y(rhs.pixel_y),
                sv(rhs.sv),
                hitList(rhs.hitList)
            {
                hitIter = hitList.begin();
            }
            

            bool completed() const { return hitIter==hitList.end(); }
            
            void next() 
            {
                if (!completed()) ++hitIter;
            }
            
            int pixel_x, pixel_y;
            osgUtil::SceneView* sv;
            osgUtil::IntersectVisitor::HitList hitList;
            osgUtil::IntersectVisitor::HitList::iterator hitIter;
            
            osg::Vec2 pointToProject() const { return osg::Vec2(pixel_x, pixel_y); }
            osg::Vec3 getLocalIntersectPoint() const { return hitIter->getLocalIntersectPoint(); }
            
            bool projectWindowXYIntoObject(const osg::Vec2& windowCoord, osg::Vec3& nearPoint, osg::Vec3& farPoint) const { return sv->projectWindowXYIntoObject(static_cast<int>(windowCoord.x()), static_cast<int>(windowCoord.y()), nearPoint, farPoint); }
            bool projectWindowXYIntoObject(osg::Vec3& nearPoint, osg::Vec3& farPoint) const { return sv->projectWindowXYIntoObject(pixel_x, pixel_y, nearPoint, farPoint); }

            const osg::Matrix& getViewMatrix() const { return sv->getViewMatrix(); }

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

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

    protected:

        Dragger();
        virtual ~Dragger();
        
        CommandManager* _commandManager;

        Dragger*	_parentDragger;
       
};


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

        typedef std::vector< osg::ref_ptr<Dragger> > DraggerList;
        
        virtual const CompositeDragger* getComposite() const { return this; }
        virtual CompositeDragger* getComposite() { return this; }

        virtual void setCommandManager(CommandManager* cm);

        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() {}
        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 setDrawableToAlwaysCull(osg::Drawable& drawable);

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

}

#endif