/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2018 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.
*/

#ifndef SLIDEEVENTHANDLER
#define SLIDEEVENTHANDLER 1

#include <osg/Switch>
#include <osg/Timer>
#include <osg/ValueObject>
#include <osg/ImageSequence>

#include <osgGA/GUIEventHandler>
#include <osgViewer/Viewer>

#include <osgPresentation/CompileSlideCallback>
#include <osgPresentation/PropertyManager>

namespace osgPresentation
{

// forward declare
class SlideEventHandler;

/// Operations related to click to run/load/key events.
enum Operation
{
    RUN,
    LOAD,
    EVENT,
    JUMP,
    FORWARD_MOUSE_EVENT,
    FORWARD_TOUCH_EVENT
};

struct JumpData : public osg::Object
{
    JumpData():
        relativeJump(true),
        slideNum(0),
        layerNum(0) {}

    JumpData(bool in_relativeJump, int in_slideNum, int in_layerNum):
        relativeJump(in_relativeJump),
        slideNum(in_slideNum),
        layerNum(in_layerNum) {}

    JumpData(const std::string& in_slideName, const std::string& in_layerName):
        relativeJump(true),
        slideNum(0),
        layerNum(0),
        slideName(in_slideName),
        layerName(in_layerName) {}

    JumpData(const JumpData& rhs, const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY):
        osg::Object(rhs, copyop),
        relativeJump(rhs.relativeJump),
        slideNum(rhs.slideNum),
        layerNum(rhs.layerNum),
        slideName(rhs.slideName),
        layerName(rhs.layerName) {}

    JumpData& operator = (const JumpData& rhs)
    {
        if (&rhs==this) return *this;
        relativeJump = rhs.relativeJump;
        slideNum = rhs.slideNum;
        layerNum = rhs.layerNum;
        slideName = rhs.slideName;
        layerName = rhs.layerName;
        return *this;
    }

    META_Object(osgPresentation, JumpData);

    bool requiresJump() const
    {
        if (!slideName.empty() || !layerName.empty()) return true;
        return relativeJump ? (slideNum!=0 || layerNum!=0) : true;
    }

    bool jump(SlideEventHandler* seh) const;

    void setRelativeJump(bool flag) { relativeJump = flag; }
    bool getRelativeJump() const { return relativeJump; }

    void setSlideNum(int num) { slideNum = num; }
    int getSlideNum() const { return slideNum; }

    void setLayerNum(int num) { layerNum = num; }
    int getLayerNum() const { return layerNum; }

    void setSlideName(const std::string& name) { slideName = name; }
    const std::string& getSlideName() const { return slideName; }

    void setLayerName(const std::string& name) { layerName = name; }
    const std::string& getLayerName() const { return layerName; }

    bool relativeJump;
    int slideNum;
    int layerNum;

    std::string slideName;
    std::string layerName;
};


struct HomePosition : public osg::Object
{
    HomePosition():
        eye(0.0, -1.0, 0.0),
        center(0.0, 0.0, 0.0),
        up(0.0, 0.0, 1.0) {}

    HomePosition(const osg::Vec3& in_eye, const osg::Vec3& in_center, const osg::Vec3& in_up):
        eye(in_eye),
        center(in_center),
        up(in_up) {}

    HomePosition(const HomePosition& rhs, const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY):
        osg::Object(rhs, copyop),
        eye(rhs.eye),
        center(rhs.center),
        up(rhs.up) {}

    HomePosition& operator = (const HomePosition& rhs)
    {
        if (&rhs==this) return *this;
        eye = rhs.eye;
        center = rhs.center;
        up = rhs.up;
        return *this;
    }

    META_Object(osgPresentation, HomePosition);

    void setEye(const osg::Vec3d& e) { eye = e; }
    const osg::Vec3d& getEye() const { return eye; }

    void setCenter(const osg::Vec3d& c) { center = c; }
    const osg::Vec3d& getCenter() const { return center; }

    void setUp(const osg::Vec3d& u) { up = u; }
    const osg::Vec3d& getUp() const { return up; }

    osg::Vec3d   eye;
    osg::Vec3d   center;
    osg::Vec3d   up;
};

struct KeyPosition : public osg::Object
{
    KeyPosition(unsigned int key=0, float x=FLT_MAX, float y=FLT_MAX, bool forward_to_devices = false):
        _key((osgGA::GUIEventAdapter::KeySymbol)key),
        _x(x),
        _y(y),
        _forwardToDevices(forward_to_devices) {}

    KeyPosition(const KeyPosition& rhs, const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY):
        osg::Object(rhs, copyop),
        _key(rhs._key),
        _x(rhs._x),
        _y(rhs._y),
        _forwardToDevices(rhs._forwardToDevices) {}

    META_Object(osgPresentation, KeyPosition);

    KeyPosition& operator = (const KeyPosition& rhs)
    {
        if (&rhs==this) return *this;
        _key = rhs._key;
        _x = rhs._x;
        _y = rhs._y;
        _forwardToDevices = rhs._forwardToDevices;
        return *this;
    }

    void set(unsigned int key=0, float x=FLT_MAX, float y=FLT_MAX, bool forward_to_devices = false)
    {
        _key = (osgGA::GUIEventAdapter::KeySymbol)key;
        _x = x;
        _y = y;
        _forwardToDevices = forward_to_devices;
    }

    void setKey(int key) { _key = static_cast<osgGA::GUIEventAdapter::KeySymbol>(key); }
    int getKey() const { return _key; }

    void setX(float x) { _x = x; }
    float getX() const { return _x; }

    void setY(float y) { _y = y; }
    float getY() const { return _y; }

    void setForwardToDevices(bool flag) { _forwardToDevices = flag; }
    bool getForwardToDevices() const { return _forwardToDevices; }


    osgGA::GUIEventAdapter::KeySymbol _key;
    float                             _x;
    float                             _y;
    bool                              _forwardToDevices;
};

struct LayerCallback : public virtual osg::Referenced
{
    virtual void operator() (osg::Node* node) const = 0;
};

struct OSGPRESENTATION_EXPORT LayerAttributes : public virtual osg::Referenced
{
    LayerAttributes():_duration(0) {}
    LayerAttributes(double in_duration):_duration(in_duration) {}

    void setDuration(double duration) { _duration = duration; }
    double getDuration() const { return _duration; }

    typedef std::vector<KeyPosition> Keys;
    typedef std::vector<std::string> RunStrings;

    void setKeys(const Keys& keys) { _keys = keys; }
    const Keys& getKeys() const { return _keys; }

    void addKey(const KeyPosition& kp) { _keys.push_back(kp); }

    void setRunStrings(const RunStrings& runStrings) { _runStrings = runStrings; }
    const RunStrings& getRunStrings() const { return _runStrings; }

    void addRunString(const std::string& runString) { _runStrings.push_back(runString); }

    void setJump(const JumpData& jumpData) { _jumpData = jumpData; }
    const JumpData& getJumpData() const { return _jumpData; }

    double      _duration;
    Keys        _keys;
    RunStrings  _runStrings;
    JumpData    _jumpData;

    void addEnterCallback(LayerCallback* lc) { _enterLayerCallbacks.push_back(lc); }
    void addLeaveCallback(LayerCallback* lc) { _leaveLayerCallbacks.push_back(lc); }

    void callEnterCallbacks(osg::Node* node);
    void callLeaveCallbacks(osg::Node* node);

    typedef std::list< osg::ref_ptr<LayerCallback> > LayerCallbacks;
    LayerCallbacks _enterLayerCallbacks;
    LayerCallbacks _leaveLayerCallbacks;
};

struct FilePathData : public virtual osg::Referenced
{
    FilePathData(const osgDB::FilePathList& fpl):filePathList(fpl) {}

    osgDB::FilePathList filePathList;
};


struct dereference_less
{
    template<class T, class U>
    inline bool operator() (const T& lhs,const U& rhs) const
    {
        return *lhs < *rhs;
    }
};

struct ObjectOperator : public osg::Referenced
{
    inline bool operator < (const ObjectOperator& rhs) const { return ptr() < rhs.ptr(); }

    virtual void* ptr() const = 0;

    virtual void enter(SlideEventHandler*) = 0;
    virtual void frame(SlideEventHandler*) {} ;
    virtual void maintain(SlideEventHandler*) = 0;
    virtual void leave(SlideEventHandler*) = 0;
    virtual void setPause(SlideEventHandler*, bool pause) = 0;
    virtual void reset(SlideEventHandler*) = 0;

    virtual ~ObjectOperator() {}
};

class OSGPRESENTATION_EXPORT ActiveOperators
{
public:
    ActiveOperators();
    ~ActiveOperators();

    void collect(osg::Node* incomingNode, osg::NodeVisitor::TraversalMode tm = osg::NodeVisitor::TRAVERSE_ACTIVE_CHILDREN);

    void process(SlideEventHandler* seh);

    void frame(SlideEventHandler*);

    void setPause(SlideEventHandler* seh, bool pause);
    bool getPause() const { return _pause; }

    void reset(SlideEventHandler* seh);

    typedef std::set< osg::ref_ptr<ObjectOperator>, dereference_less >  OperatorList;

protected:

    void processOutgoing(SlideEventHandler* seh);
    void processIncoming(SlideEventHandler* seh);
    void processMaintained(SlideEventHandler* seh);

    bool            _pause;

    OperatorList    _previous;
    OperatorList    _current;

    OperatorList    _outgoing;
    OperatorList    _incoming;
    OperatorList    _maintained;

};

class OSGPRESENTATION_EXPORT SlideEventHandler : public osgGA::GUIEventHandler
{
public:

    SlideEventHandler(osgViewer::Viewer* viewer=0);

    SlideEventHandler(const SlideEventHandler& seh,const osg::CopyOp& copyop);

    static SlideEventHandler* instance();

    META_Object(osgPresentation,SlideEventHandler);

    void set(osg::Node* model);

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

    virtual void getUsage(osg::ApplicationUsage& usage) const;

    osgViewer::Viewer* getViewer() { return _viewer.get(); }

    osg::Switch* getPresentationSwitch() { return _presentationSwitch.get(); }


    enum WhichPosition
    {
        FIRST_POSITION = 0,
        LAST_POSITION = -1
    };

    void compileSlide(unsigned int slideNum);
    void releaseSlide(unsigned int slideNum);

    unsigned int getNumSlides();

    int getActiveSlide() const { return _activeSlide; }
    int getActiveLayer() const { return _activeLayer; }

    osg::Switch* getSlide(int slideNum);
    osg::Node* getLayer(int slideNum, int layerNum);

    bool selectSlide(int slideNum,int layerNum=FIRST_POSITION);
    bool selectLayer(int layerNum);

    bool nextLayerOrSlide();
    bool previousLayerOrSlide();

    bool nextSlide();
    bool previousSlide();

    bool nextLayer();
    bool previousLayer();

    bool home();

    void setAutoSteppingActive(bool flag = true) { _autoSteppingActive = flag; }
    bool getAutoSteppingActive() const { return _autoSteppingActive; }

    void setTimeDelayBetweenSlides(double dt) { _timePerSlide = dt; }
    double getTimeDelayBetweenSlides() const { return _timePerSlide; }

    double getDuration(const osg::Node* node) const;

    double getCurrentTimeDelayBetweenSlides() const;

    void setReleaseAndCompileOnEachNewSlide(bool flag) { _releaseAndCompileOnEachNewSlide = flag; }
    bool getReleaseAndCompileOnEachNewSlide() const { return _releaseAndCompileOnEachNewSlide; }

    void setTimeDelayOnNewSlideWithMovies(float t) { _timeDelayOnNewSlideWithMovies = t; }
    float getTimeDelayOnNewSlideWithMovies() const { return _timeDelayOnNewSlideWithMovies; }

    void setLoopPresentation(bool loop) { _loopPresentation = loop; }
    bool getLoopPresentation() const { return _loopPresentation; }


    void dispatchEvent(const KeyPosition& keyPosition);
    void dispatchEvent(osgGA::Event* event);

    void forwardEventToDevices(osgGA::Event* event);

    void setRequestReload(bool flag);
    bool getRequestReload() const { return _requestReload; }

    double getReferenceTime() const { return _referenceTime; }

    virtual bool checkNeedToDoFrame();

protected:

    ~SlideEventHandler() {}

    bool home(const osgGA::GUIEventAdapter& ea,osgGA::GUIActionAdapter& aa);

    void updateAlpha(bool, bool, float x, float y);
    void updateLight(float x, float y);

    void updateOperators();


    osg::observer_ptr<osgViewer::Viewer>    _viewer;

    osg::observer_ptr<osg::Switch>          _showSwitch;
    int                                     _activePresentation;

    osg::observer_ptr<osg::Switch>          _presentationSwitch;
    int                                     _activeSlide;

    osg::observer_ptr<osg::Switch>          _slideSwitch;
    int                                     _activeLayer;

    bool                                    _firstTraversal;
    double                                  _referenceTime;
    double                                  _previousTime;
    double                                  _timePerSlide;
    bool                                    _autoSteppingActive;
    bool                                    _loopPresentation;
    bool                                    _pause;
    bool                                    _hold;

    bool                                    _updateLightActive;
    bool                                    _updateOpacityActive;
    float                                   _previousX, _previousY;

    bool                                    _cursorOn;

    bool                                    _releaseAndCompileOnEachNewSlide;

    bool                                    _firstSlideOrLayerChange;
    osg::Timer_t                            _tickAtFirstSlideOrLayerChange;
    osg::Timer_t                            _tickAtLastSlideOrLayerChange;

    float                                   _timeDelayOnNewSlideWithMovies;

    double                                  _minimumTimeBetweenKeyPresses;
    double                                  _timeLastKeyPresses;

    ActiveOperators                         _activeOperators;

    osg::ref_ptr<CompileSlideCallback>      _compileSlideCallback;

    bool                                    _requestReload;
};

}

#endif
