//
//
// This software is provided under the LGPL in March 2009 by the
// Cluster Science Centre
// QSAS team,
// Imperial College, London
//
// Copyright (C) 2009  Imperial College, London
// Copyright (C) 2009-2016  Alan W. Irwin
//
// This is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Lesser Public License as published
// by the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This software 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 Lesser General Public License for more details.
//
// To received a copy of the GNU Library General Public License
// write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
//
//  History:
//
//
// March 2009:  v1.00
// Initial release.
//
//

//
// Interpretation of the -geometry XSIZExYSIZE option (or the third and fourth
// parameters of plspage if those are specified by the user instead) for
// the various devices:
// - the raster devices (bmpqt, jpgqt, pngqt, ppmqt, tiffqt):
// XSIZE and YSIZE define the x and y size in pixels
// - qtwidget:
// XSIZE and YSIZE define the default x and y size of the widget in
// pixels, as well as its aspect ratio, which is kept when the widget is
// resized.
// - svgqt, epsqt, pdfqt:
// XSIZE and YSIZE define the x and y size in points (1/72 of inches).
// EPS and PDF files will be drawn in A4 pages for Qt versions before 4.4
//
// Interpretation of the -dpi DPI option (or the first parameter of
// plspage if that is specified by the user instead).
// DPI is ignored for all but the raster devices.  For those devices
// DPI should be set to the DPI value of the monitor being used to view
// the results if exact character sizes are desired.  Otherwise, DEFAULT_DPI
// (set to an average value for modern monitors) is used instead.
//

#ifndef QT_H
#define QT_H

#include <iostream>
#include <QImage>
#include <QPainter>
#include <QLinkedList>
#include <QPrinter>
#include <QApplication>
#include <QWidget>
#include <QMouseEvent>
#include <QTabWidget>
#include <QMainWindow>
#include <QPicture>
#include <QMutex>
#include <QPainterPath>

#include "plDevs.h"
#include "plplotP.h"
#include "drivers.h"

// Used for devices (epsqt, pdfqt, svgqt) with known physical size in points.
#define POINTS_PER_INCH    72

// Average value of dots per inch assumed for modern monitors if the user
// does not specify a value appropriate to their monitor with plspage or
// the -dpi option.  Used only for devices with size specified in pixels
// but not qtwidget since it has independent access to information (e.g.,
// delivered by X) about the DPI of the monitor.  So this value is only
// used for the raster devices (bmpqt, jpgqt, pngqt, ppmqt, tiffqt).
#define DEFAULT_DPI    72

// These values are in units of pixels (the raster devices and qtwidget)
// or points (epsqt, pdfqt, svgqt).  In the points case, this corresponds
// to the A4 paper size.
#define QT_DEFAULT_X    842
#define QT_DEFAULT_Y    595

class QtPLDriver;

// Master Device Handler for multiple streams
// Only handles multiple Qt devices
class PLDLLIMPEXP_QT MasterHandler : public QObject
{
    Q_OBJECT

public:
    MasterHandler();

    bool isMasterDevice( QtPLDriver* d );
    void setMasterDevice( QtPLDriver* d );
    void DeviceChangedPage( QtPLDriver* d );
    void DeviceClosed( QtPLDriver* d );

signals:
    void MasterChangedPage();
    void MasterClosed();

protected:
    QtPLDriver* masterDevice;
};

// Basic class, offering the common interface to all Qt plplot devices
class PLDLLIMPEXP_QT QtPLDriver
{
public:
    // Constructor, taking the device size as arguments
    QtPLDriver( PLINT i_iWidth = QT_DEFAULT_X, PLINT i_iHeight = QT_DEFAULT_Y );

    virtual ~QtPLDriver();              // does not delete emitter!

    void setPLStream( PLStream *pls );  // store the related stream

    virtual void drawArc( short x, short y, short width, short height, PLFLT angle1, PLFLT angle2, PLFLT rotate, bool fill );
    // Draws a line from (x1, y1) to (x2, y2) in internal plplot coordinates
    virtual void drawLine( short x1, short y1, short x2, short y2 );
    virtual void drawPolyline( short * x, short * y, PLINT npts );
    virtual void drawPolygon( short * x, short * y, PLINT npts );
    virtual void drawText( EscText* txt );
    virtual void setColor( int r, int g, int b, double alpha );
    virtual void setBackgroundColor( int /* r */, int /* g */, int /* b */, double /* alpha */ ){}
    virtual void setGradient( int x1, int x2, int y1, int y2,
                              unsigned char *r, unsigned char *g,
                              unsigned char *b, PLFLT *alpha, PLINT ncol1 );
    virtual void setWidthF( PLFLT w );
    // Set pen to draw solid strokes (called after drawing dashed strokes)
    virtual void setSolid();
    // Conversion factor from internal plplot coordinates to device coordinates
    double        downscale;
    double        m_dWidth, m_dHeight;
    static QMutex mutex;     // All-purpose mutex

protected:
    // Returns font with the good size for a QPicture's resolution
    QFont getFont( PLUNICODE code );
    // Draws text in a QPicture using a sub-QPicture (!), updates the current xOffset
    void drawTextInPicture( QPainter*, const QString& );
    // Gets the QPicture displaying text, with the base chrht char height
    QPicture getTextPicture( PLUNICODE fci, PLUNICODE* text, int len, PLFLT chrht );

    // Text-related variables
    bool     underlined;
    bool     overlined;
    double   currentFontScale;
    double   currentFontSize;
    double   yOffset;
    double   xOffset;

    PLStream *pls;

    QPainter * m_painterP;
};

#if defined ( PLD_bmpqt ) || defined ( PLD_jpgqt ) || defined ( PLD_pngqt ) || defined ( PLD_ppmqt ) || defined ( PLD_tiffqt ) || defined ( PLD_memqt )
// Driver painting whatever raster format Qt can save
class PLDLLIMPEXP_QT QtRasterDevice : public QtPLDriver, public QImage
{
public:
    QtRasterDevice( int i_iWidth = QT_DEFAULT_X,
                    int i_iHeight = QT_DEFAULT_Y );
    virtual ~QtRasterDevice();

    virtual void setBackgroundColor( int r, int g, int b, double alpha );
    void definePlotName( const char* fileName, const char* format );
    void savePlot();
    virtual void setResolution( double dotsPerInch )
    {
        setDotsPerMeterX( (int) ( ( dotsPerInch / 25.4 ) * 1000. ) );
        setDotsPerMeterY( (int) ( ( dotsPerInch / 25.4 ) * 1000. ) );
    }
    // used by the memqt driver
    unsigned char *memory;

protected:
    char    format[5];
    QString fileName;
};
#endif

#if defined ( PLD_svgqt ) && QT_VERSION >= 0x040300
#include <QSvgGenerator>
// Driver painting on an SVG device
class PLDLLIMPEXP_QT QtSVGDevice : public QtPLDriver, public QSvgGenerator
{
public:
    QtSVGDevice( int i_iWidth = QT_DEFAULT_X,
                 int i_iHeight = QT_DEFAULT_Y );

    virtual ~QtSVGDevice();

    virtual void setBackgroundColor( int r, int g, int b, double alpha );
    void definePlotName( const char* fileName );
    void savePlot();

protected:
};
#endif

#if defined ( PLD_epsqt ) || defined ( PLD_pdfqt )
// Driver painting on an EPS or PDF device, uses QPrinter
// A (possibly dummy) QApplication must be declared before use
class PLDLLIMPEXP_QT QtEPSDevice : public QtPLDriver, public QPrinter
{
public:
#if QT_VERSION < 0x040400
    QtEPSDevice( int i_iWidth = -1, int i_iHeight = -1 );
#else
    QtEPSDevice( int i_iWidth = QT_DEFAULT_X, int i_iHeight = QT_DEFAULT_Y );
#endif

    virtual ~QtEPSDevice();

    virtual void setBackgroundColor( int r, int g, int b, double alpha );
    void definePlotName( const char* fileName, int ifeps );
    void savePlot();

protected:
};
#endif

#if defined ( PLD_qtwidget ) || defined ( PLD_extqt )

typedef enum ElementType_
{
    LINE,
    POLYLINE,
    POLYGON,
    RECTANGLE,
    SET_WIDTH,
    SET_COLOUR,
    SET_GRADIENT,
    SET_SMOOTH,
    TEXT,
    SET_BG_COLOUR,
    ARC
} ElementType; // Identifiers for elements of the buffer

struct ColourStruct_
{
    PLINT R, G, B, A;
};

struct TextStruct_
{
    PLFLT     x;
    PLFLT     y;
    PLFLT     clipxmin;
    PLFLT     clipymin;
    PLFLT     clipxmax;
    PLFLT     clipymax;
    PLFLT     rotation;
    PLFLT     shear;
    PLFLT     stride;
    PLFLT     just;
    PLUNICODE * text;
    PLUNICODE fci;
    PLINT     len;
    PLFLT     chrht;
};

struct ArcStruct_
{
    QRectF  *rect;
    QPointF *dx;
    int     startAngle;
    int     spanAngle;
    PLFLT   rotate;
    bool    fill;
};

class BufferElement
{
public:
    ElementType Element;

    union DataType
    {
        QLineF * Line;
        QPolygonF           * Polyline;
        QRectF              * Rect;
        QLinearGradient     * LinearGradient;
        struct ColourStruct_* ColourStruct;
        struct TextStruct_  * TextStruct;
        struct ArcStruct_   * ArcStruct;
        PLINT intParam;
        PLFLT fltParam;
    } Data;
};

// This widget allows to use plplot as a plotting engine in a Qt
// Application. The aspect ratio of the plotted data is constant, so
// gray strips are used to delimit the page when the widget aspect
// ratio is not the one of the plotted page.

// N.B. The moc application assumes that the first inherited class and
// only that inherited class is a subclass of QObject.  Therefore,
// Qwidget (a subclass of QObject) must be first.
class PLDLLIMPEXP_QT QtPLWidget : public QWidget, public QtPLDriver
{
    Q_OBJECT

public:
    // Parameters are the actual size of the page, NOT the size of the widget
    // Call QWidget::resize for that
    QtPLWidget( int i_iWidth = QT_DEFAULT_X, int i_iHeight = QT_DEFAULT_Y, QWidget * parent = 0 );

    virtual ~QtPLWidget();

    void clearWidget();
    void clearBuffer();

    int pageNumber;

    void drawArc( short x, short y, short width, short height, PLFLT angle1, PLFLT angle2, PLFLT rotate, bool fill );
    void drawLine( short x1, short y1, short x2, short y2 );
    void drawPolyline( short * x, short * y, PLINT npts );
    void drawPolygon( short * x, short * y, PLINT npts );
    void setColor( int r, int g, int b, double alpha );
    void setBackgroundColor( int r, int g, int b, double alpha );
    void setGradient( int x1, int x2, int y1, int y2,
                      unsigned char *r, unsigned char *g,
                      unsigned char *b, PLFLT *alpha, PLINT ncol1 );
    void setWidthF( PLFLT r );
    void drawText( EscText* txt );
    void flush();
    void getCursorCmd( PLGraphicsIn *ptr );

protected:

    void resizeEvent( QResizeEvent* );
    void paintEvent( QPaintEvent* );
    void mouseEvent( QMouseEvent * event );

    void getPlotParameters( double & io_dXFact, double & io_dYFact, double & io_dXOffset, double & io_dYOffset );   // gives the parameters to scale and center the plot on the page
    void doPlot( QPainter* p, double x_fact, double y_fact, double x_offset, double y_offset );                     // Actually draws the plot. Deported in a function for readability
    void renderText( QPainter* p, struct TextStruct_* s, double x_fact, double x_offset, double y_fact, double y_offset );
    void lookupButtonEvent( QMouseEvent * event );
    void locate();

    void resetPensAndBrushes( QPainter* );

    double  m_dAspectRatio;                      // Is kept constant during resizes
    QPixmap * m_pixPixmap;                       // stores the drawn image as long as it does not have to be regenerated

    QLinkedList<BufferElement> m_listBuffer;     // Buffer holding the draw instructions
//         bool m_bAwaitingRedraw;
//         int m_iOldSize; // Holds the size of the buffer. Modified => image has to be redrawn
    bool redrawFromLastFlush;
    bool redrawAll;

    // Pens and brushes required to maintain the status between 2 flushes
    QPen   SolidPen;
    QPen   NoPen;
    bool   hasPen;
    QBrush SolidBrush;
    // end parameters

    QLinkedList<BufferElement>::const_iterator start_iterator;

    struct
    {
        int    r;
        int    g;
        int    b;
        double alpha;
    } lastColour;

    struct
    {
        int    r;
        int    g;
        int    b;
        double alpha;
    }            bgColour;

    PLGraphicsIn gin;         // Graphics Input Structure
    int          locate_mode; // Set while in locate mode

protected slots:
    void mousePressEvent( QMouseEvent * event );
    void mouseReleaseEvent( QMouseEvent * event );
    void mouseMoveEvent( QMouseEvent * event );
    void keyPressEvent( QKeyEvent* event );
    void closeEvent( QCloseEvent* event );
    void nextPage();
};

#endif

#if defined ( PLD_extqt )
class PLDLLIMPEXP_QT QtExtWidget : public QtPLWidget
{
    Q_OBJECT

public:
    QtExtWidget( int i_iWidth = QT_DEFAULT_X, int i_iHeight = QT_DEFAULT_Y, QWidget * parent = 0 );

    virtual ~QtExtWidget();

    void captureMousePlotCoords( PLFLT* x, PLFLT* y );

public slots:

    void mouseMoveEvent( QMouseEvent* event );
    void mouseReleaseEvent( QMouseEvent* event );
    void mousePressEvent( QMouseEvent* event );

protected:
    void paintEvent( QPaintEvent* );

    struct
    {
        bool   isTracking;
        double cursor_x, cursor_y;
    }    cursorParameters;

    bool killed;
};

PLDLLIMPEXP_QT void plsetqtdev( QtExtWidget* widget );                        // Registers the widget as plot device, as the widget has to be created in the Qt application GUI, prior to any plplot call. Must be called before plinit().

PLDLLIMPEXP_QT void plsetqtdev( QtExtWidget* widget, int argc, char** argv ); // Registers the widget as plot device, as the widget has to be created in the Qt application GUI, prior to any plplot call. Must be called before plinit().

PLDLLIMPEXP_QT void plfreeqtdev();                                            // Deletes and unregisters the device.

#endif

// These variables are declared in plqt.cpp but also needed
// by the qt driver.
extern PLDLLIMPEXP_QT_DATA( int ) vectorize;
extern PLDLLIMPEXP_QT_DATA( int ) lines_aa;
extern PLDLLIMPEXP_QT_DATA( MasterHandler ) handler;

#if defined ( plplot_pyqt4_EXPORTS )
#define initplplot_pyqt4    PLDLLIMPEXP_PYQT4 initplplot_pyqt4
#endif

#if defined ( plplot_pyqt5_EXPORTS )
#define initplplot_pyqt5    PLDLLIMPEXP_PYQT5 initplplot_pyqt5
#endif

#endif