/* -*- c++ -*- */
/*
 * Copyright 2014 Free Software Foundation, Inc.
 *
 * This file is part of GNU Radio
 *
 * GNU Radio 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; either version 3, or (at your option)
 * any later version.
 *
 * GNU Radio 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 GNU Radio; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */

#ifndef VECTOR_DISPLAY_PLOT
#define VECTOR_DISPLAY_PLOT

#include <gnuradio/qtgui/VectorDisplayPlot.h>

#include <gnuradio/qtgui/qtgui_types.h>
#include <qwt_scale_draw.h>
#include <qwt_legend.h>
#include <QColor>
#include <iostream>

#if QWT_VERSION < 0x060100
#include <qwt_legend_item.h>
#else /* QWT_VERSION < 0x060100 */
#include <qwt_legend_data.h>
#include <qwt_legend_label.h>
#endif /* QWT_VERSION < 0x060100 */

/***********************************************************************
 * Widget to provide mouse pointer coordinate text
 **********************************************************************/
class VectorDisplayZoomer: public QwtPlotZoomer
{
public:
#if QWT_VERSION < 0x060100
  VectorDisplayZoomer(QwtPlotCanvas* canvas)
#else /* QWT_VERSION < 0x060100 */
  VectorDisplayZoomer(QWidget* canvas)
#endif /* QWT_VERSION < 0x060100 */
    : QwtPlotZoomer(canvas),
    d_x_units(" "),
    d_y_units(" ")
  {
    setTrackerMode(QwtPicker::AlwaysOn);
  }

  virtual void updateTrackerText()
  {
    updateDisplay();
  }

  void setXUnits(const QString &units)
  {
    d_x_units = units;
  }

  void setYUnits(const QString &units)
  {
    d_y_units = units;
  }

protected:
  using QwtPlotZoomer::trackerText;
  virtual QwtText trackerText(QPoint const &p) const
  {
    QwtDoublePoint dp = QwtPlotZoomer::invTransform(p);
    QwtText t(QString("%1 %2, %3 %4")
              .arg(dp.x(), 0, 'f', 2)
              .arg(d_x_units)
              .arg(dp.y(), 0, 'f', 2)
              .arg(d_y_units)
    );
    return t;
  }

private:
  QString d_x_units; //!< Units on x-Axis (e.g. Hz)
  QString d_y_units; //!< Units on y-Axis (e.g. V)
};


/***********************************************************************
 * Main frequency display plotter widget
 **********************************************************************/
VectorDisplayPlot::VectorDisplayPlot(int nplots, QWidget* parent)
  : DisplayPlot(nplots, parent),
    d_x_axis_label("x"),
    d_y_axis_label("y")
{
  d_numPoints = 1024;
  d_x_axis_start = 0;
  d_x_axis_step = 1.0;
  d_ymin = -10;
  d_ymax = 10;

  d_min_vec_data = new double[d_numPoints];
  d_max_vec_data = new double[d_numPoints];
  d_xdata = new double[d_numPoints];

  setAxisTitle(QwtPlot::xBottom, d_x_axis_label);
  setAxisScale(QwtPlot::xBottom, d_x_axis_start, d_numPoints-1);

  setAxisScaleEngine(QwtPlot::yLeft, new QwtLinearScaleEngine);
  setAxisScale(QwtPlot::yLeft, d_ymin, d_ymax);
  setAxisTitle(QwtPlot::yLeft, d_y_axis_label);

  QList<QColor> default_colors;
  default_colors << QColor(Qt::blue) << QColor(Qt::red) << QColor(Qt::green)
	 << QColor(Qt::black) << QColor(Qt::cyan) << QColor(Qt::magenta)
	 << QColor(Qt::yellow) << QColor(Qt::gray) << QColor(Qt::darkRed)
	 << QColor(Qt::darkGreen) << QColor(Qt::darkBlue) << QColor(Qt::darkGray);

  // Create a curve for each input
  // Automatically deleted when parent is deleted
  for(unsigned int i = 0; i < d_nplots; ++i) {
    d_ydata.push_back(new double[d_numPoints]);
    memset(d_ydata[i], 0x0, d_numPoints*sizeof(double));

    d_plot_curve.push_back(new QwtPlotCurve(QString("Data %1").arg(i)));
    d_plot_curve[i]->attach(this);

    QwtSymbol *symbol = new QwtSymbol(QwtSymbol::NoSymbol, QBrush(default_colors[i]),
				      QPen(default_colors[i]), QSize(7,7));

#if QWT_VERSION < 0x060000
    d_plot_curve[i]->setRawData(d_xdata, d_ydata[i], d_numPoints);
    d_plot_curve[i]->setSymbol(*symbol);
#else
    d_plot_curve[i]->setRawSamples(d_xdata, d_ydata[i], d_numPoints);
    d_plot_curve[i]->setSymbol(symbol);
#endif
    setLineColor(i, default_colors[i]);
  }

  // Create min/max plotter curves
  d_min_vec_plot_curve = new QwtPlotCurve("Min Hold");
  d_min_vec_plot_curve->attach(this);
  const QColor default_min_fft_color = Qt::magenta;
  setMinVecColor(default_min_fft_color);
#if QWT_VERSION < 0x060000
  d_min_vec_plot_curve->setRawData(d_xdata, d_min_vec_data, d_numPoints);
#else
  d_min_vec_plot_curve->setRawSamples(d_xdata, d_min_vec_data, d_numPoints);
#endif
  d_min_vec_plot_curve->setVisible(false);
  d_min_vec_plot_curve->setZ(0);

  d_max_vec_plot_curve = new QwtPlotCurve("Max Hold");
  d_max_vec_plot_curve->attach(this);
  QColor default_max_fft_color = Qt::darkYellow;
  setMaxVecColor(default_max_fft_color);
#if QWT_VERSION < 0x060000
  d_max_vec_plot_curve->setRawData(d_xdata, d_max_vec_data, d_numPoints);
#else
  d_max_vec_plot_curve->setRawSamples(d_xdata, d_max_vec_data, d_numPoints);
#endif
  d_max_vec_plot_curve->setVisible(false);
  d_max_vec_plot_curve->setZ(0);

  d_lower_intensity_marker= new QwtPlotMarker();
  d_lower_intensity_marker->setLineStyle(QwtPlotMarker::HLine);
  QColor default_marker_lower_intensity_color = Qt::cyan;
  setMarkerLowerIntensityColor(default_marker_lower_intensity_color);
  d_lower_intensity_marker->attach(this);

  d_upper_intensity_marker = new QwtPlotMarker();
  d_upper_intensity_marker->setLineStyle(QwtPlotMarker::HLine);
  QColor default_marker_upper_intensity_color = Qt::green;
  setMarkerUpperIntensityColor(default_marker_upper_intensity_color);
  d_upper_intensity_marker->attach(this);

  memset(d_xdata, 0x0, d_numPoints*sizeof(double));

  for(int64_t number = 0; number < d_numPoints; number++){
    d_min_vec_data[number] = 1e6;
    d_max_vec_data[number] = -1e6;
  }

  d_marker_ref_level = new QwtPlotMarker();
  d_marker_ref_level->setLineStyle(QwtPlotMarker::HLine);
  QColor d_default_marker_ref_level_color = Qt::darkRed;
  setMarkerRefLevelAmplitudeColor(d_default_marker_ref_level_color);
  d_marker_ref_level->attach(this);

  d_ref_level = -HUGE_VAL;

  d_zoomer = new VectorDisplayZoomer(canvas());

#if QWT_VERSION < 0x060000
  d_zoomer->setSelectionFlags(QwtPicker::RectSelection | QwtPicker::DragSelection);
#endif

  d_zoomer->setMousePattern(QwtEventPattern::MouseSelect2,
                            Qt::RightButton, Qt::ControlModifier);
  d_zoomer->setMousePattern(QwtEventPattern::MouseSelect3,
                            Qt::RightButton);


  const QColor default_zoomer_color(Qt::darkRed);
  setZoomerColor(default_zoomer_color);

  // Do this after the zoomer has been built
  _resetXAxisPoints();

  // Turn off min/max hold plots in legend
#if QWT_VERSION < 0x060100
  QWidget *w;
  QwtLegend* legendDisplay = legend();
  w = legendDisplay->find(d_min_vec_plot_curve);
  ((QwtLegendItem*)w)->setChecked(true);
  w = legendDisplay->find(d_max_vec_plot_curve);
  ((QwtLegendItem*)w)->setChecked(true);
#else /* QWT_VERSION < 0x060100 */
  QWidget *w;
  w = ((QwtLegend*)legend())->legendWidget(itemToInfo(d_min_vec_plot_curve));
  ((QwtLegendLabel*)w)->setChecked(true);
  w = ((QwtLegend*)legend())->legendWidget(itemToInfo(d_max_vec_plot_curve));
  ((QwtLegendLabel*)w)->setChecked(true);
#endif /* QWT_VERSION < 0x060100 */

  replot();
}

VectorDisplayPlot::~VectorDisplayPlot()
{
  for(unsigned int i = 0; i < d_nplots; ++i)
    delete [] d_ydata[i];
  delete[] d_max_vec_data;
  delete[] d_min_vec_data;
  delete[] d_xdata;
}

void
VectorDisplayPlot::setYaxis(double min, double max)
{
  // Get the new max/min values for the plot
  d_ymin = min;
  d_ymax = max;

  // Set the axis max/min to the new values
  setAxisScale(QwtPlot::yLeft, d_ymin, d_ymax);

  // Reset the base zoom level to the new axis scale set here.
  // But don't do it if we set the axis due to auto scaling.
  if(!d_autoscale_state)
    d_zoomer->setZoomBase();
}

double
VectorDisplayPlot::getYMin() const
{
  return d_ymin;
}

double
VectorDisplayPlot::getYMax() const
{
  return d_ymax;
}

void VectorDisplayPlot::setXAxisLabel(const QString &label)
{
  d_x_axis_label = label;
  setAxisTitle(QwtPlot::xBottom, label);
}

void VectorDisplayPlot::setYAxisLabel(const QString &label)
{
  d_y_axis_label = label;
  setAxisTitle(QwtPlot::yLeft, label);
}

void VectorDisplayPlot::setXAxisUnit(const QString &unit)
{
  ((VectorDisplayZoomer*)d_zoomer)->setXUnits(unit);
}

void VectorDisplayPlot::setYAxisUnit(const QString &unit)
{
  ((VectorDisplayZoomer*)d_zoomer)->setYUnits(unit);
}

void
VectorDisplayPlot::setXAxisValues(
    const double start,
    const double step
) {
  bool reset = false;
  if((start != d_x_axis_start) || (step != d_x_axis_step))
    reset = true;

  d_x_axis_start = start;
  d_x_axis_step = step;

  if((axisScaleDraw(QwtPlot::xBottom) != NULL) && (d_zoomer != NULL)) {
    setAxisTitle(QwtPlot::xBottom, d_x_axis_label);
    if(reset) {
      _resetXAxisPoints();
      clearMaxData();
      clearMinData();
    }
  }
}

void
VectorDisplayPlot::replot()
{
  d_marker_ref_level->setYValue(d_ref_level);
  QwtPlot::replot();
}

void
VectorDisplayPlot::plotNewData(
      const std::vector<double*> dataPoints,
      const int64_t numDataPoints,
      const double refLevel,
      const double timeInterval
) {
  if(!d_stop) {
    if(numDataPoints > 0) {
      if(numDataPoints != d_numPoints) {
        d_numPoints = numDataPoints;

        delete[] d_min_vec_data;
        delete[] d_max_vec_data;
        delete[] d_xdata;
        d_xdata = new double[d_numPoints];
        d_min_vec_data = new double[d_numPoints];
        d_max_vec_data = new double[d_numPoints];

        for(unsigned int i = 0; i < d_nplots; ++i) {
          delete[] d_ydata[i];
          d_ydata[i] = new double[d_numPoints];

#if QWT_VERSION < 0x060000
          d_plot_curve[i]->setRawData(d_xdata, d_ydata[i], d_numPoints);
#else
          d_plot_curve[i]->setRawSamples(d_xdata, d_ydata[i], d_numPoints);
#endif
        }
#if QWT_VERSION < 0x060000
        d_min_vec_plot_curve->setRawData(d_xdata, d_min_vec_data, d_numPoints);
        d_max_vec_plot_curve->setRawData(d_xdata, d_max_vec_data, d_numPoints);
#else
        d_min_vec_plot_curve->setRawSamples(d_xdata, d_min_vec_data, d_numPoints);
        d_max_vec_plot_curve->setRawSamples(d_xdata, d_max_vec_data, d_numPoints);
#endif
        _resetXAxisPoints();
        clearMaxData();
        clearMinData();
      }

      double bottom=1e20, top=-1e20;
      for(unsigned int n = 0; n < d_nplots; ++n) {

        memcpy(d_ydata[n], dataPoints[n], numDataPoints*sizeof(double));

        for(int64_t point = 0; point < numDataPoints; point++) {
          if(dataPoints[n][point] < d_min_vec_data[point]) {
            d_min_vec_data[point] = dataPoints[n][point];
          }
          if(dataPoints[n][point] > d_max_vec_data[point]) {
            d_max_vec_data[point] = dataPoints[n][point];
          }

          // Find overall top and bottom values in plot.
          // Used for autoscaling y-axis.
          if(dataPoints[n][point] < bottom) {
            bottom = dataPoints[n][point];
          }
          if(dataPoints[n][point] > top) {
            top = dataPoints[n][point];
          }
        }
      }

      if(d_autoscale_state)
        _autoScale(bottom, top);

      d_ref_level = refLevel;

      replot();
    }
  }
}

void
VectorDisplayPlot::clearMaxData()
{
  for(int64_t number = 0; number < d_numPoints; number++) {
    d_max_vec_data[number] = d_ymin;
  }
}

void
VectorDisplayPlot::clearMinData()
{
  for(int64_t number = 0; number < d_numPoints; number++) {
    d_min_vec_data[number] = d_ymax;
  }
}

void
VectorDisplayPlot::_autoScale(double bottom, double top)
{
  // Auto scale the y-axis with a margin of 10 dB on either side.
  d_ymin = bottom-10;
  d_ymax = top+10;
  setYaxis(d_ymin, d_ymax);
}

void
VectorDisplayPlot::setAutoScale(bool state)
{
  d_autoscale_state = state;
}

void
VectorDisplayPlot::setMaxVecVisible(const bool visibleFlag)
{
  d_max_vec_visible = visibleFlag;
  d_max_vec_plot_curve->setVisible(visibleFlag);
}

const bool
VectorDisplayPlot::getMaxVecVisible() const
{
  return d_max_vec_visible;
}

void
VectorDisplayPlot::setMinVecVisible(const bool visibleFlag)
{
  d_min_vec_visible = visibleFlag;
  d_min_vec_plot_curve->setVisible(visibleFlag);
}

const bool
VectorDisplayPlot::getMinVecVisible() const
{
  return d_min_vec_visible;
}

void
VectorDisplayPlot::_resetXAxisPoints()
{
  double xValue = d_x_axis_start;
  for(int64_t loc = 0; loc < d_numPoints; loc++) {
    d_xdata[loc] = xValue;
    xValue += d_x_axis_step;
  }

  setAxisScale(QwtPlot::xBottom, d_xdata[0], d_xdata[d_numPoints-1]);

  // Set up zoomer base for maximum unzoom x-axis
  // and reset to maximum unzoom level
  QwtDoubleRect zbase = d_zoomer->zoomBase();
  d_zoomer->zoom(zbase);
  d_zoomer->setZoomBase(zbase);
  d_zoomer->setZoomBase(true);
  d_zoomer->zoom(0);
}

void
VectorDisplayPlot::setLowerIntensityLevel(const double lowerIntensityLevel)
{
  d_lower_intensity_marker->setYValue(lowerIntensityLevel);
}

void
VectorDisplayPlot::setUpperIntensityLevel(const double upperIntensityLevel)
{
  d_upper_intensity_marker->setYValue(upperIntensityLevel);
}

void
VectorDisplayPlot::setTraceColour(QColor c)
{
  d_plot_curve[0]->setPen(QPen(c));
}

void
VectorDisplayPlot::setBGColour(QColor c)
{
  QPalette palette;
  palette.setColor(canvas()->backgroundRole(), c);
  canvas()->setPalette(palette);
}

void
VectorDisplayPlot::onPickerPointSelected(const QwtDoublePoint & p)
{
  QPointF point = p;
  point.setX(point.x());
  emit plotPointSelected(point);
}

void
VectorDisplayPlot::onPickerPointSelected6(const QPointF & p)
{
  QPointF point = p;
  point.setX(point.x());
  emit plotPointSelected(point);
}

void
VectorDisplayPlot::setMinVecColor (QColor c)
{
  d_min_vec_color = c;
  d_min_vec_plot_curve->setPen(QPen(c));
}

const QColor
VectorDisplayPlot::getMinVecColor() const
{
  return d_min_vec_color;
}

void
VectorDisplayPlot::setMaxVecColor (QColor c)
{
  d_max_vec_color = c;
  d_max_vec_plot_curve->setPen(QPen(c));
}

const QColor
VectorDisplayPlot::getMaxVecColor() const
{
  return d_max_vec_color;
}

void
VectorDisplayPlot::setMarkerLowerIntensityColor (QColor c)
{
  d_marker_lower_intensity_color = c;
  d_lower_intensity_marker->setLinePen(QPen(c));
}
const QColor
VectorDisplayPlot::getMarkerLowerIntensityColor () const
{
  return d_marker_lower_intensity_color;
}

void
VectorDisplayPlot::setMarkerLowerIntensityVisible (bool visible)
{
  d_marker_lower_intensity_visible = visible;
  if(visible)
    d_lower_intensity_marker->setLineStyle(QwtPlotMarker::HLine);
  else
    d_lower_intensity_marker->setLineStyle(QwtPlotMarker::NoLine);
}
const bool
VectorDisplayPlot::getMarkerLowerIntensityVisible() const
{
  return d_marker_lower_intensity_visible;
}

void
VectorDisplayPlot::setMarkerUpperIntensityColor(QColor c)
{
  d_marker_upper_intensity_color = c;
  d_upper_intensity_marker->setLinePen(QPen(c, 0, Qt::DotLine));
}

const QColor
VectorDisplayPlot::getMarkerUpperIntensityColor() const
{
  return d_marker_upper_intensity_color;
}

void
VectorDisplayPlot::setMarkerUpperIntensityVisible(bool visible)
{
  d_marker_upper_intensity_visible = visible;
  if(visible)
    d_upper_intensity_marker->setLineStyle(QwtPlotMarker::HLine);
  else
    d_upper_intensity_marker->setLineStyle(QwtPlotMarker::NoLine);
}

const bool
VectorDisplayPlot::getMarkerUpperIntensityVisible() const
{
  return d_marker_upper_intensity_visible;
}

void
VectorDisplayPlot::setMarkerRefLevelAmplitudeColor(QColor c)
{
  d_marker_ref_level_color = c;
  d_marker_ref_level->setLinePen(QPen(c, 0, Qt::DotLine));
}

const QColor
VectorDisplayPlot::getMarkerRefLevelAmplitudeColor() const
{
  return d_marker_ref_level_color;
}

void
VectorDisplayPlot::setMarkerRefLevelAmplitudeVisible(bool visible)
{
  d_marker_ref_level_visible = visible;
  if(visible)
    d_marker_ref_level->setLineStyle(QwtPlotMarker::HLine);
  else
    d_marker_ref_level->setLineStyle(QwtPlotMarker::NoLine);
}

const bool
VectorDisplayPlot::getMarkerRefLevelAmplitudeVisible() const
{
  return d_marker_ref_level_visible;
}

#endif /* VECTOR_DISPLAY_PLOT */