// Part of BNC, a utility for retrieving decoding and
// converting GNSS data streams from NTRIP broadcasters.
//
// Copyright (C) 2007
// German Federal Agency for Cartography and Geodesy (BKG)
// http://www.bkg.bund.de
// Czech Technical University Prague, Department of Geodesy
// http://www.fsv.cvut.cz
//
// Email: euref-ip@bkg.bund.de
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation, version 2.
//
// This program 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

/* -------------------------------------------------------------------------
 * BKG NTRIP Client
 * -------------------------------------------------------------------------
 *
 * Class:      t_graphWin
 *
 * Purpose:    Window for plots
 *
 * Author:     L. Mervart
 *
 * Created:    23-Jun-2012
 *
 * Changes:
 *
 * -----------------------------------------------------------------------*/

#include <qwt_scale_widget.h>
#include <qwt_scale_engine.h>

#include <QDir>
#include <QFileInfo>
#include <QHBoxLayout>
#include <QVBoxLayout>
#include <QPushButton>

#include "graphwin.h"
#include "bncsettings.h"

using namespace std;

// Constructor
////////////////////////////////////////////////////////////////////////////
t_graphWin::t_graphWin(QWidget* parent, const QString& fileName,
                       const QVector<QWidget*>& plots,
                       const QByteArray* scaleTitle,
                       const QwtInterval* scaleInterval) :  QDialog(parent) {

  _fileName = fileName;

  this->setAttribute(Qt::WA_DeleteOnClose);

  setWindowTitle(_fileName);

  int ww = QFontMetrics(font()).width('w');
  setMinimumSize(plots.size()*40*ww, 40*ww);

  // Buttons
  // -------
  _buttonClose = new QPushButton(tr("Close"), this);
  _buttonClose->setMaximumWidth(10*ww);
  connect(_buttonClose, SIGNAL(clicked()), this, SLOT(slotClose()));

  _buttonPrint = new QPushButton(tr("Print"), this);
  _buttonPrint->setMaximumWidth(10*ww);
  connect(_buttonPrint, SIGNAL(clicked()), this, SLOT(slotPrint()));

  // Color Scale
  // -----------
  if (scaleTitle && scaleInterval) {
    _colorScale = new QwtScaleWidget( this );
    _colorScale->setAlignment( QwtScaleDraw::RightScale );
    _colorScale->setColorBarEnabled( true );

     QwtText title(*scaleTitle);
     QFont font = _colorScale->font();
     font.setBold( true );
     title.setFont( font );
     _colorScale->setTitle( title );

     _colorScale->setColorMap(*scaleInterval, new t_colorMap());

     QwtLinearScaleEngine scaleEngine;
     _colorScale->setTransformation(scaleEngine.transformation());
     _colorScale->setScaleDiv(scaleEngine.divideScale(scaleInterval->minValue(),
                                                      scaleInterval->maxValue(),
                                                      8, 5));
  }
  else {
    _colorScale = 0;
  }

  // Layout
  // ------
  _canvas = new QWidget(this);
  if (plots.size() != 3) {
    QHBoxLayout* plotLayout = new QHBoxLayout(_canvas);
    for (int ip = 0; ip < plots.size(); ip++) {
      plotLayout->addWidget(plots[ip]);
    }
    if (_colorScale) {
      plotLayout->addWidget(_colorScale);
    }
  }
  else {
    QHBoxLayout* plotLayout = new QHBoxLayout(_canvas);
    plotLayout->addWidget(plots[0]);
    QVBoxLayout* hlpLayout = new QVBoxLayout;
    hlpLayout->addWidget(plots[1]);
    hlpLayout->addWidget(plots[2]);
    plotLayout->addLayout(hlpLayout);
  }

  QHBoxLayout* buttonLayout = new QHBoxLayout;
  buttonLayout->addWidget(_buttonClose);
  buttonLayout->addWidget(_buttonPrint);

  QVBoxLayout* mainLayout = new QVBoxLayout(this);
  mainLayout->addWidget(_canvas);
  mainLayout->addLayout(buttonLayout);
}

// Destructor
////////////////////////////////////////////////////////////////////////////
t_graphWin::~t_graphWin() {
}

// Accept the Options
////////////////////////////////////////////////////////////////////////////
void t_graphWin::slotClose() {
  done(0);
}

// Close Dialog gracefully
////////////////////////////////////////////////////////////////////////////
void t_graphWin::closeEvent(QCloseEvent* event) {
  QDialog::closeEvent(event);
}

// Print the widget
////////////////////////////////////////////////////////////////////////////
void t_graphWin::slotPrint() {

  QPrinter printer;
  QPrintDialog* dialog = new QPrintDialog(&printer, this);
  dialog->setWindowTitle(tr("Print Plot"));
  if (dialog->exec() != QDialog::Accepted) {
    return;
  }
  else {
    QPainter painter;
    painter.begin(&printer);
    double xscale = printer.pageRect().width()/double(_canvas->width());
    double yscale = printer.pageRect().height()/double(_canvas->height());
    double scale  = qMin(xscale, yscale);
    painter.translate(printer.paperRect().x() + printer.pageRect().width()/2,
                      printer.paperRect().y() + printer.pageRect().height()/2);
    painter.scale(scale, scale);
    painter.translate(-width()/2, -height()/2);
    _canvas->render(&painter);
  }
}

// Save the Widget as PNG Files
////////////////////////////////////////////////////////////////////////////
void t_graphWin::savePNG(const QString& dirName, QByteArray ext) {

  if (dirName.isEmpty()) {
    return;
  }

  QDir dir(dirName);
  QFileInfo fileInfo(_fileName);
  if (ext.isEmpty()) {
    ext = ".png";
  }
  QString fileName = dir.path() + QDir::separator()
                   + fileInfo.completeBaseName() + ext;

  QPalette palette = _canvas->palette();
  QColor oldColor = palette.color(QPalette::Window);
  palette.setColor(QPalette::Window, Qt::white);
  _canvas->setPalette(palette);

  QImage image(_canvas->size(), QImage::Format_RGB32);
  QPainter painter(&image);
  _canvas->render(&painter);
  image.save(fileName,"PNG");

  palette.setColor(QPalette::Window, oldColor);
  _canvas->setPalette(palette);
}