/*
 * Software License Agreement (BSD License)
 *
 *  Point Cloud Library (PCL) - www.pointclouds.org
 *  Copyright (c) 2010-2011, Willow Garage, Inc.
 *  Copyright (c) 2012-, Open Perception, Inc.
 *
 *  All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions
 *  are met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above
 *     copyright notice, this list of conditions and the following
 *     disclaimer in the documentation and/or other materials provided
 *     with the distribution.
 *   * Neither the name of the copyright holder(s) nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 *  FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 *  COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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 *  LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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 *  POSSIBILITY OF SUCH DAMAGE.
 *
 */

#include <vtkVersion.h>
#if VTK_MAJOR_VERSION == 9 && VTK_MINOR_VERSION == 0
#include <limits> // This must be included before vtkDoubleArray.h
#endif
#include <vtkDoubleArray.h>
#include <vtkSmartPointer.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkContextView.h>
#include <vtkChartXY.h>
#include <vtkColorSeries.h>
#include <vtkContextScene.h>
#include <vtkAxis.h>
#include <vtkPlot.h>
#include <vtkTable.h>

#include <algorithm>
#include <fstream>
#include <limits>

#include <pcl/visualization/pcl_plotter.h>

#define VTK_CREATE(type, name) \
  vtkSmartPointer<type> name = vtkSmartPointer<type>::New()

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
pcl::visualization::PCLPlotter::PCLPlotter (char const *name)
  : view_ (vtkSmartPointer<vtkContextView>::New ())
  , chart_(vtkSmartPointer<vtkChartXY>::New())
  , color_series_(vtkSmartPointer<vtkColorSeries>::New ())
  , exit_loop_timer_(vtkSmartPointer<ExitMainLoopTimerCallback>::New ())
  , exit_callback_(vtkSmartPointer<ExitCallback>::New ())
{
  //connecting and mandatory bookkeeping
  view_->GetScene ()->AddItem (chart_);
  view_->GetRenderWindow ()->SetWindowName (name);
  
  //###WARNING: hardcoding logic ;) :-/.. please see plot() and spin*() functions for the logic
  exit_loop_timer_->interactor = view_->GetInteractor ();
  exit_callback_->plotter = this;
  
  //initializing default state values
  win_width_ = 640;
  win_height_ = 480;
  win_x_ = 0;
  win_y_ = 0;
  bkg_color_[0] = 1; bkg_color_[1] = 1; bkg_color_[2] = 1;
  current_plot_ = -1;
  color_series_->SetColorScheme (vtkColorSeries::SPECTRUM);
  win_name_ = "PCL Plotter";
}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
pcl::visualization::PCLPlotter::~PCLPlotter() = default;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void
pcl::visualization::PCLPlotter::addPlotData (
    double const* array_X, double const* array_Y, 
    unsigned long size, char const * name /* = "Y Axis" */, 
    int type, char const* color)
{
  //updating the current plot ID
  current_plot_++;
  
  //creating a permanent copy of the arrays
  double *permanent_X = new double[size];
  double *permanent_Y = new double[size];
  std::copy(array_X, array_X + size, permanent_X);
  std::copy(array_Y, array_Y + size, permanent_Y);

  //transforming data to be fed to the vtkChartXY
  VTK_CREATE (vtkTable, table);

  VTK_CREATE (vtkDoubleArray, varray_X);
  varray_X->SetName ("X Axis");
  varray_X->SetArray (permanent_X, size, 1, vtkDoubleArray::VTK_DATA_ARRAY_DELETE);
  table->AddColumn (varray_X);

  VTK_CREATE (vtkDoubleArray, varray_Y);
  varray_Y->SetName (name);
  varray_Y->SetArray (permanent_Y, size, 1, vtkDoubleArray::VTK_DATA_ARRAY_DELETE);
  table->AddColumn (varray_Y);

  //adding to chart
  //vtkPlot *line = chart_->AddPlot(vtkChart::LINE);
  vtkPlot *line = chart_->AddPlot (type);
  line->SetInputData (table, 0, 1);
  line->SetWidth (1);

  if (!color)    //color automatically based on the ColorScheme
  {
    vtkColor3ub vcolor = color_series_->GetColorRepeating (current_plot_);
    line->SetColor (vcolor[0], vcolor[1], vcolor[2], 255);
  }
  else                  //add the specific color
    line->SetColor (color[0], color[1], color[2], color[3]);
}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void
pcl::visualization::PCLPlotter::addPlotData (
    std::vector<double> const &array_X, 
    std::vector<double> const &array_Y, 
    char const * name /* = "Y Axis" */, 
    int type /* = vtkChart::LINE */, 
    std::vector<char> const &color)
{
  this->addPlotData (array_X.data(), array_Y.data(), static_cast<unsigned long> (array_X.size ()), name, type, (color.empty ()) ? nullptr : color.data());
}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void
pcl::visualization::PCLPlotter::addPlotData (
    std::vector<std::pair<double, double> > const &plot_data, 
    char const * name /* = "Y Axis" */, 
    int type, 
    std::vector<char> const &color)
{
  double *array_x = new double[plot_data.size ()];
  double *array_y = new double[plot_data.size ()];

  for (std::size_t i = 0; i < plot_data.size (); i++)
  {
    array_x[i] = plot_data[i].first;
    array_y[i] = plot_data[i].second;
  }
  this->addPlotData (array_x, array_y, static_cast<unsigned long> (plot_data.size ()), name, type, (color.empty ()) ? nullptr : color.data());
  delete[] array_x;
  delete[] array_y;
}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void
pcl::visualization::PCLPlotter::addPlotData (
    PolynomialFunction const & p_function,
    double x_min, double x_max,
    char const *name,
    int num_points,
    int type,
    std::vector<char> const &color)
{
  std::vector<double> array_x (num_points), array_y (num_points);
  double incr = (x_max - x_min)/num_points;

  for (int i = 0; i < num_points; i++)
  {
    double xval = i*incr + x_min;
    array_x[i] = xval;
    array_y[i] = compute(p_function, xval);
  }

  this->addPlotData (array_x, array_y, name, type, color);
}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void
pcl::visualization::PCLPlotter::addPlotData (
    RationalFunction const & r_function,
    double x_min, double x_max,
    char const *name,
    int num_points,
    int type,
    std::vector<char> const &color)
{
  std::vector<double> array_x(num_points), array_y(num_points);
  double incr = (x_max - x_min)/num_points;
  
  for (int i = 0; i < num_points; i++)
  {
    double xval = i*incr + x_min;
    double yval = compute(r_function, xval);
    //if (yval == std::numeric_limits<double>::max()) continue; //handling dived by zero
    
    array_x[i] = xval;
    array_y[i] = yval;
  }
  
  this->addPlotData (array_x, array_y, name, type, color);
}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void
pcl::visualization::PCLPlotter::addPlotData (
    double (*function)(double),
    double x_min, double x_max,
    char const *name,
    int num_points,
    int type,
    std::vector<char> const &color)
{
  std::vector<double> array_x(num_points), array_y(num_points);
  double incr = (x_max - x_min)/num_points;
  
  for (int i = 0; i < num_points; i++)
  {
    double xval = i*incr + x_min;
    array_x[i] = xval;
    array_y[i] = function(xval);
  }
  
  this->addPlotData (array_x, array_y, name, type, color);
}

void
pcl::visualization::PCLPlotter::addPlotData (
    char const *filename,
    int type)
{
  std::ifstream fin(filename);
  
  //getting the no of column
  std::string line;
  getline (fin, line);
  std::stringstream ss(line);
  
  std::vector<std::string> pnames;       //plot names
  std::string xname, temp;         //plot name of X axis
  
  //checking X axis name
  ss >> xname;
  //getting Y axis names
  while (ss >> temp)
    pnames.push_back(temp);
    
  int nop = static_cast<int>(pnames.size ());// number of plots (y coordinate vectors)  
  
  std::vector<double> xarray;      //array of X coordinates
  std::vector< std::vector<double> > yarrays (nop); //a set of array of Y coordinates
  
  //reading the entire table
  double x, y;
  while (fin >> x)
  {
    xarray.push_back(x);
    
    for (int i = 0; i < nop; i++)
    {
      fin >> y;
      yarrays[i].push_back (y);
    }
  }
  
  //adding nop plot data
  for (int i = 0; i < nop; i++)
    this->addPlotData (xarray, yarrays[i], pnames[i].c_str(), type);    
}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void
pcl::visualization::PCLPlotter::addHistogramData (
    std::vector<double> const& data, 
    int const nbins, 
    char const *name, 
    std::vector<char> const &color)
{
  std::vector<std::pair<double, double> > histogram;
  computeHistogram (data, nbins, histogram);
  this->addPlotData (histogram, name, vtkChart::BAR, color);
}

////////////////////////////////HistVizualizer Functions//////////////////////////////////////
bool
pcl::visualization::PCLPlotter::addFeatureHistogram (
    const pcl::PCLPointCloud2 &cloud, const std::string &field_name,
    const std::string &id, int win_width, int win_height)
{
  // Get the field
  int field_idx = pcl::getFieldIndex (cloud, field_name);
  if (field_idx == -1)
  {
    PCL_ERROR ("[addFeatureHistogram] Invalid field (%s) given!\n", field_name.c_str ());
    return (false);
  }

  int hsize = cloud.fields[field_idx].count;
  std::vector<double> array_x (hsize), array_y (hsize);
  
  // Parse the cloud data and store it in the array
  for (int i = 0; i < hsize; ++i)
  {
    array_x[i] = i;
    float data;
    // TODO: replace float with the real data type
    memcpy (&data, &cloud.data[cloud.fields[field_idx].offset + i * sizeof (float)], sizeof (float));
    array_y[i] = data;
  }
  
  this->addPlotData(array_x, array_y, id.c_str(), vtkChart::LINE);
  setWindowSize (win_width, win_height);
  return (true);
}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
bool
pcl::visualization::PCLPlotter::addFeatureHistogram (
    const pcl::PCLPointCloud2 &cloud,
    const std::string &field_name, 
    const pcl::index_t index,
    const std::string &id, int win_width, int win_height)
{
  if (index < 0 || index >= static_cast<pcl::index_t> (cloud.width * cloud.height))
  {
    PCL_ERROR ("[addFeatureHistogram] Invalid point index (%d) given!\n", index);
    return (false);
  }
  
  // Get the field
  int field_idx = pcl::getFieldIndex (cloud, field_name);
  if (field_idx == -1)
  {
    PCL_ERROR ("[addFeatureHistogram] Invalid field (%s) given!\n", field_name.c_str ());
    return (false);
  }

  // Compute the total size of the fields
  unsigned int fsize = 0;
  for (const auto &field : cloud.fields)
    fsize += field.count * pcl::getFieldSize (field.datatype);
  
  int hsize = cloud.fields[field_idx].count;
  std::vector<double> array_x (hsize), array_y (hsize);
  
  // Parse the cloud data and store it in the array
  for (int i = 0; i < hsize; ++i)
  {
    array_x[i] = i;
    float data;
    // TODO: replace float with the real data type
    memcpy (&data, &cloud.data[index * fsize + cloud.fields[field_idx].offset + i * sizeof (float)], sizeof (float));
    array_y[i] = data;
  }
  
  this->addPlotData (array_x, array_y, id.c_str(), vtkChart::LINE);
  setWindowSize (win_width, win_height);
  return (true);
}

///////////////////end of PCLHistogramVisualizer functions/////////////////////


//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void
pcl::visualization::PCLPlotter::setColorScheme (int scheme)
{
  color_series_->SetColorScheme (scheme);
}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
int
pcl::visualization::PCLPlotter::getColorScheme ()
{
  return (color_series_->GetColorScheme ());
}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void
pcl::visualization::PCLPlotter::plot ()
{
  //apply current states
  view_->GetRenderer ()->SetBackground (bkg_color_[0], bkg_color_[1], bkg_color_[2]);
  view_->GetRenderWindow ()->SetSize (win_width_, win_height_);
  view_->GetRenderWindow ()->SetPosition (win_x_, win_y_);
  view_->GetInteractor ()->Initialize ();
  
  //according to vtk bug 976, SetWindowName must be called after RenderWindow Initialize();
  view_->GetRenderWindow ()->SetWindowName (win_name_.c_str());
  view_->GetRenderWindow ()->Render ();
  view_->GetInteractor ()->Start ();
}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void 
pcl::visualization::PCLPlotter::spinOnce (const int spin_time)
{
  //apply current states
  view_->GetRenderer ()->SetBackground (bkg_color_[0], bkg_color_[1], bkg_color_[2]);
  view_->GetRenderWindow ()->SetSize (win_width_, win_height_);
  
  //start timer to spin
  if (!view_->GetInteractor ()->GetEnabled ())
  {
    view_->GetInteractor ()->Initialize ();
    view_->GetInteractor ()->AddObserver (vtkCommand::TimerEvent, exit_loop_timer_);
    view_->GetInteractor ()->AddObserver (vtkCommand::ExitEvent, exit_callback_);
  }
  exit_loop_timer_->right_timer_id = view_->GetInteractor()->CreateOneShotTimer (spin_time);
  
  // Start spinning
  view_->GetRenderWindow ()->Render ();
	view_->GetInteractor()->Start();
}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void 
pcl::visualization::PCLPlotter::renderOnce ()
{
  //apply current states
  view_->GetRenderer ()->SetBackground (bkg_color_[0], bkg_color_[1], bkg_color_[2]);
  view_->GetRenderWindow ()->SetSize (win_width_, win_height_);
  
  //render
  view_->GetInteractor ()->Initialize ();
  view_->GetRenderWindow ()->Render();
}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void 
pcl::visualization::PCLPlotter::spin ()
{
  this->plot ();
}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void
pcl::visualization::PCLPlotter::clearPlots ()
{
  chart_->ClearPlots ();
  current_plot_ = 0;
}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void
pcl::visualization::PCLPlotter::setBackgroundColor (const double r, const double g, const double b)
{
  bkg_color_[0] = r;
  bkg_color_[1] = g;
  bkg_color_[2] = b;
}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void
pcl::visualization::PCLPlotter::setBackgroundColor (const double color[3])
{
  bkg_color_[0] = color[0];
  bkg_color_[1] = color[1];
  bkg_color_[2] = color[2];
}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
double*
pcl::visualization::PCLPlotter::getBackgroundColor ()
{
  double *bc = new double[3];
  bc[0] = bkg_color_[0];
  bc[1] = bkg_color_[1];
  bc[2] = bkg_color_[2];
  return (bc);
}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void 
pcl::visualization::PCLPlotter::setYRange (double min, double max)
{
  chart_->GetAxis (vtkAxis::LEFT)->SetRange (min, max);
  chart_->GetAxis (vtkAxis::LEFT)->SetBehavior (vtkAxis::FIXED);
}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void 
pcl::visualization::PCLPlotter::setXRange (double min, double max)
{
  chart_->GetAxis (vtkAxis::BOTTOM)->SetRange (min, max);
  chart_->GetAxis (vtkAxis::BOTTOM)->SetBehavior (vtkAxis::FIXED);
}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void 
pcl::visualization::PCLPlotter::setTitle (const char *title)
{
	chart_->SetTitle (title);
	chart_->SetShowLegend (true);
}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void 
pcl::visualization::PCLPlotter::setXTitle (const char *title)
{
  chart_->GetAxis (vtkAxis::BOTTOM)->SetTitle (title);
  chart_->SetShowLegend (true);
}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void 
pcl::visualization::PCLPlotter::setYTitle (const char *title)
{
  chart_->GetAxis (vtkAxis::LEFT)->SetTitle (title);
  chart_->SetShowLegend (true);
}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void
pcl::visualization::PCLPlotter::setShowLegend (bool flag)
{
  chart_->SetShowLegend (flag);
}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void
pcl::visualization::PCLPlotter::setWindowSize (int w, int h)
{
  win_width_ = w;
  win_height_ = h;
}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
int*
pcl::visualization::PCLPlotter::getWindowSize () const
{
  int *sz = new int[2];
  sz[0] = win_width_;
  sz[1] = win_height_;
  return (sz);
}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void
pcl::visualization::PCLPlotter::setWindowPosition (int x, int y)
{
    win_x_ = x;
    win_y_ = y;
}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void
pcl::visualization::PCLPlotter::setWindowName (const std::string &name)
{
    win_name_ = name;
}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////
void
pcl::visualization::PCLPlotter::startInteractor ()
{
  view_->GetInteractor()->Initialize ();
  view_->GetInteractor()->Start ();
}

///////////////////////IMPORTANT PRIVATE FUNCTIONS///////////////////////////////
void
pcl::visualization::PCLPlotter::computeHistogram (
    std::vector<double> const &data, 
    int const nbins, 
    std::vector<std::pair<double, double> > &histogram)
{
  //resizing the vector to nbins to store histogram;
  histogram.resize (nbins);

  //find min and max in the data
  double min = data[0], max = data[0];
  for (std::size_t i = 1; i < data.size (); i++)
  {
    if (std::isfinite (data[i]))
    {
      if (data[i] < min) min = data[i];
      if (data[i] > max) max = data[i];
    }
  }

  //finding the size of each bins
  double size = (max - min) / nbins;
  if (size == 0) size = 1.0;

  //fill x values of each bins by bin center
  for (int i = 0; i < nbins; i++)
  {
    histogram[i].first = min + (size * i) + size / 2; //size/2 for the middle of the bins
    histogram[i].second = 0; //initializing the freq to zero
  }

  //fill the freq for each data
  for (const double &value : data)
  {
    if (std::isfinite (value))
    {
      auto index = static_cast<unsigned int>(std::floor ((value - min) / size));
      if (index == static_cast<unsigned int>(nbins)) index = nbins - 1; //including right boundary
      histogram[index].second++;
    }
  }
}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
double 
pcl::visualization::PCLPlotter::compute (
    pcl::visualization::PCLPlotter::PolynomialFunction const & p_function, 
    double val)
{
  double res = 0;
  for (std::size_t i = 0; i < p_function.size (); i++)
    res += (p_function[i] * pow (val, static_cast<double> (i)) );
  return (res);
}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
double 
pcl::visualization::PCLPlotter::compute (RationalFunction const & r_function, double val)
{
  PolynomialFunction numerator = r_function.first, denominator = r_function.second;
  
  double dres = this->compute (denominator,val);
  //if (dres == 0) return std::numeric_limits<double>::max();  //return the max possible double value to represent infinity
  double nres = this->compute (numerator,val);
  return (nres/dres);
}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void
pcl::visualization::PCLPlotter::setViewInteractor (
    vtkSmartPointer<vtkRenderWindowInteractor> interactor)
{
  view_->SetInteractor (interactor);
}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
bool
pcl::visualization::PCLPlotter::wasStopped () const
{
  if (view_->GetInteractor()) 
    return (stopped_); 
  return (true);
}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void
pcl::visualization::PCLPlotter::close ()
{
  stopped_ = true;
  // This tends to close the window...
  view_->GetInteractor()->TerminateApp ();
}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
vtkSmartPointer<vtkRenderWindow>
pcl::visualization::PCLPlotter::getRenderWindow ()
{
  return (view_->GetRenderWindow ());
}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void
pcl::visualization::PCLPlotter::ExitMainLoopTimerCallback::Execute (
    vtkObject*, unsigned long event_id, void* call_data)
{
  if (event_id != vtkCommand::TimerEvent)
    return;
  int timer_id = *(reinterpret_cast<int*> (call_data));

  if (timer_id != right_timer_id)
    return;

  // Stop vtk loop and send notification to app to wake it up
  interactor->TerminateApp ();
}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void
pcl::visualization::PCLPlotter::ExitCallback::Execute (
    vtkObject*, unsigned long event_id, void*)
{
  if (event_id != vtkCommand::ExitEvent)
    return;
  plotter->stopped_ = true;
  plotter->view_->GetInteractor ()->TerminateApp ();
}
