/*=========================================================================

Program:   Visualization Toolkit
Module:    vtkQtTreeRingLabelMapper.cxx

Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
/*-------------------------------------------------------------------------
  Copyright 2008 Sandia Corporation.
  Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
  the U.S. Government retains certain rights in this software.
  -------------------------------------------------------------------------*/

// Hide VTK_DEPRECATED_IN_9_1_0() warnings for this class.
#define VTK_DEPRECATION_LEVEL 0

#include "vtkQtTreeRingLabelMapper.h"
#include "vtkCamera.h"
#include "vtkCoordinate.h"
#include "vtkDataSetAttributes.h"
#include "vtkDoubleArray.h"
#include "vtkExecutive.h"
#include "vtkImageData.h"
#include "vtkMath.h"
#include "vtkObjectFactory.h"
#include "vtkPlaneSource.h"
#include "vtkPolyDataMapper2D.h"
#include "vtkProperty2D.h"
#include "vtkQImageToImageSource.h"
#include "vtkRenderWindow.h"
#include "vtkRenderer.h"
#include "vtkStringArray.h"
#include "vtkTextProperty.h"
#include "vtkTexture.h"
#include "vtkTextureMapToPlane.h"
#include "vtkTexturedActor2D.h"
#include "vtkTree.h"
#include "vtkUnicodeString.h"
#include "vtkUnicodeStringArray.h"

#include <QApplication>
#include <QFont>
#include <QFontMetricsF>
#include <QImage>
#include <QPainter>
#include <QTextDocument>
#include <QTextStream>

// #include <QFile>
// #include <QIODevice>

#include "vtkSmartPointer.h"
#define VTK_CREATE(type, name) vtkSmartPointer<type> name = vtkSmartPointer<type>::New()

vtkStandardNewMacro(vtkQtTreeRingLabelMapper);

vtkCxxSetObjectMacro(vtkQtTreeRingLabelMapper, LabelTextProperty, vtkTextProperty);

vtkQtTreeRingLabelMapper::vtkQtTreeRingLabelMapper()
{
  this->Input = nullptr;
  this->Renderer = nullptr;

  this->VCoord = vtkCoordinate::New();

  this->LabeledComponent = (-1);
  this->FieldDataArray = 0;
  this->FieldDataName = nullptr;

  this->TextRotationArrayName = nullptr;
  this->SetTextRotationArrayName("TextRotation");
  this->SetSectorsArrayName("area");

  this->LabelTextProperty = vtkTextProperty::New();
  this->LabelTextProperty->SetFontSize(10);
  this->LabelTextProperty->SetBold(1);
  this->LabelTextProperty->SetItalic(1);
  this->LabelTextProperty->SetShadow(1);
  this->LabelTextProperty->SetFontFamilyToArial();
  this->SetLabelFormat("%s");

  this->WindowSize[0] = this->WindowSize[1] = 0;

  this->PlaneSource = vtkPlaneSource::New();
  this->TextureMapToPlane = vtkTextureMapToPlane::New();
  this->polyDataMapper = vtkPolyDataMapper2D::New();

  this->QtImageSource = vtkQImageToImageSource::New();
  this->LabelTexture = vtkTexture::New();

  this->QtImage = new QImage(1, 1, QImage::Format_ARGB32_Premultiplied);

  // FIXME: QImage is initialized to grey.  This will fix that, although it is a bit of a hack...
  QPainter painter(this->QtImage);
  painter.setRenderHints(QPainter::Antialiasing | QPainter::TextAntialiasing);
  painter.setCompositionMode(QPainter::CompositionMode_Clear);
  painter.drawImage(0, 0, *this->QtImage);
  painter.setCompositionMode(QPainter::CompositionMode_SourceOver);

  this->QtImageSource->SetQImage(this->QtImage);
  this->LabelTexture->SetInputConnection(this->QtImageSource->GetOutputPort());
  this->LabelTexture->PremultipliedAlphaOn();

  this->TextureMapToPlane->SetSRange(0., 1.);
  this->TextureMapToPlane->SetTRange(0., 1.);
  this->TextureMapToPlane->SetInputConnection(this->PlaneSource->GetOutputPort());
  this->TextureMapToPlane->AutomaticPlaneGenerationOn();

  this->polyDataMapper->SetInputConnection(this->TextureMapToPlane->GetOutputPort());
}

vtkQtTreeRingLabelMapper::~vtkQtTreeRingLabelMapper()
{
  this->SetRenderer(nullptr);

  this->SetLabelTextProperty(nullptr);
  this->SetFieldDataName(nullptr);

  this->SetTextRotationArrayName(nullptr);

  this->VCoord->Delete();
  this->PlaneSource->Delete();
  this->TextureMapToPlane->Delete();
  this->polyDataMapper->Delete();

  this->QtImageSource->Delete();
  this->LabelTexture->Delete();

  delete this->QtImage;
}

//------------------------------------------------------------------------------
void vtkQtTreeRingLabelMapper::RenderOverlay(vtkViewport* viewport, vtkActor2D* actor)
{
  vtkRenderer* ren = vtkRenderer::SafeDownCast(viewport);
  if (ren)
  {
    this->LabelTexture->Render(ren);
  }
  this->polyDataMapper->RenderOverlay(viewport, actor);
}

//------------------------------------------------------------------------------
void vtkQtTreeRingLabelMapper::RenderOpaqueGeometry(vtkViewport* viewport, vtkActor2D* actor)
{
  if (!QApplication::instance())
  {
    vtkErrorMacro("This class requires a QApplication instance.");
    return;
  }

  vtkTextProperty* tprop = this->LabelTextProperty;
  if (!tprop)
  {
    vtkErrorMacro(<< "Need text property to render labels");
    return;
  }

  int numComp = 0, activeComp = 0;
  vtkAbstractArray* abstractData;
  vtkDataArray *numericData, *sectorInfo;
  vtkStringArray* stringData;
  vtkUnicodeStringArray* uStringData;
  vtkTree* input = this->GetInputTree();
  if (!input)
  {
    vtkErrorMacro(<< "Need input tree to render labels (2)");
    return;
  }

  if (input->GetNumberOfVertices() == 0)
  {
    return;
  }

  vtkDataSetAttributes* pd = input->GetVertexData();
  sectorInfo = this->GetInputArrayToProcess(0, input);
  if (!sectorInfo)
  {
    vtkErrorMacro(<< "Input Tree does not have sector information.");
    return;
  }

  vtkRenderer* renderer = vtkRenderer::SafeDownCast(viewport);

  if (this->CurrentViewPort != viewport || this->GetMTime() > this->BuildTime ||
    input->GetMTime() > this->BuildTime || tprop->GetMTime() > this->BuildTime ||
    renderer->GetActiveCamera()->GetMTime() > this->BuildTime)
  {
    vtkDebugMacro(<< "Rebuilding labels");

    const int* size = renderer->GetSize();
    this->WindowSize[0] = size[0];
    this->WindowSize[1] = size[1];

    // See if we have to recalculate fonts sizes
    if (this->CurrentViewPort != viewport)
    {
      this->CurrentViewPort = viewport;
    }

    // figure out what to label, and if we can label it
    abstractData = nullptr;
    numericData = nullptr;
    stringData = nullptr;
    uStringData = nullptr;
    switch (this->LabelMode)
    {
      case VTK_LABEL_SCALARS:
        if (pd->GetScalars())
        {
          numericData = pd->GetScalars();
        }
        break;
      case VTK_LABEL_VECTORS:
        if (pd->GetVectors())
        {
          numericData = pd->GetVectors();
        }
        break;
      case VTK_LABEL_NORMALS:
        if (pd->GetNormals())
        {
          numericData = pd->GetNormals();
        }
        break;
      case VTK_LABEL_TCOORDS:
        if (pd->GetTCoords())
        {
          numericData = pd->GetTCoords();
        }
        break;
      case VTK_LABEL_TENSORS:
        if (pd->GetTensors())
        {
          numericData = pd->GetTensors();
        }
        break;
      case VTK_LABEL_FIELD_DATA:
      {
        int arrayNum;
        if (this->FieldDataName != nullptr)
        {
          abstractData = pd->GetAbstractArray(this->FieldDataName, arrayNum);
        }
        else
        {
          arrayNum = (this->FieldDataArray < pd->GetNumberOfArrays() ? this->FieldDataArray
                                                                     : pd->GetNumberOfArrays() - 1);
          abstractData = pd->GetAbstractArray(arrayNum);
        }
        numericData = vtkArrayDownCast<vtkDataArray>(abstractData);
        stringData = vtkArrayDownCast<vtkStringArray>(abstractData);
        uStringData = vtkArrayDownCast<vtkUnicodeStringArray>(abstractData);
      };
      break;
    }

    // determine number of components and check input
    if (numericData)
    {
      numComp = numericData->GetNumberOfComponents();
      activeComp = 0;
      if (this->LabeledComponent >= 0)
      {
        activeComp = (this->LabeledComponent < numComp ? this->LabeledComponent : numComp - 1);
        numComp = 1;
      }
    }
    else if (!stringData && !uStringData)
    {
      vtkErrorMacro(<< "Need input data to render labels (3)");
      return;
    }

    this->LabelTree(
      input, sectorInfo, numericData, stringData, uStringData, activeComp, numComp, viewport);
  }

  VTK_CREATE(vtkQImageToImageSource, qis);
  qis->SetQImage(this->QtImage);
  this->LabelTexture->SetInputConnection(qis->GetOutputPort());
  this->LabelTexture->PremultipliedAlphaOn();

  this->PlaneSource->SetOrigin(0, 0, 0);
  this->PlaneSource->SetPoint1(this->WindowSize[0], 0, 0);
  this->PlaneSource->SetPoint2(0, this->WindowSize[1], 0);

  this->polyDataMapper->RenderOpaqueGeometry(viewport, actor);
}

void vtkQtTreeRingLabelMapper::LabelTree(vtkTree* tree, vtkDataArray* sectorInfo,
  vtkDataArray* numericData, vtkStringArray* stringData, int activeComp, int numComps,
  vtkViewport* viewport)
{
  LabelTree(tree, sectorInfo, numericData, stringData, nullptr, activeComp, numComps, viewport);
}

void vtkQtTreeRingLabelMapper::LabelTree(vtkTree* tree, vtkDataArray* sectorInfo,
  vtkDataArray* numericData, vtkStringArray* stringData, vtkUnicodeStringArray* uStringData,
  int activeComp, int numComps, vtkViewport* viewport)
{
  delete this->QtImage;
  this->QtImage = new QImage(this->WindowSize[0], this->WindowSize[1], QImage::Format_ARGB32);

  char string[1024];
  vtkIdType i, root = tree->GetRoot();
  if (root < 0)
  {
    vtkErrorMacro(<< "Input Tree does not have a root.");
    return;
  }

  vtkDataArray* TextRotationArray = tree->GetVertexData()->GetArray(this->TextRotationArrayName);

  // FIXME - The image surface appears to be initialized to grey.  This clears it, but seems like
  // there should be a more appropriate way to do this...
  QPainter painter(this->QtImage);
  painter.setRenderHints(QPainter::Antialiasing | QPainter::TextAntialiasing);
  painter.setCompositionMode(QPainter::CompositionMode_Clear);
  painter.drawImage(0, 0, *this->QtImage);
  painter.setCompositionMode(QPainter::CompositionMode_SourceOver);
  // end FIXME

  // set text properties from LabelTextProperty
  QFont fontSpec(this->LabelTextProperty->GetFontFamilyAsString());
  fontSpec.setStyleStrategy(QFont::PreferAntialias);
  fontSpec.setBold(this->LabelTextProperty->GetBold());
  fontSpec.setItalic(this->LabelTextProperty->GetItalic());
  fontSpec.setPointSize(this->LabelTextProperty->GetFontSize());

  double* fc = this->LabelTextProperty->GetColor();

  double slimits[4], sdimDC[2], textPosDC[2];
  for (i = 0; i < tree->GetNumberOfVertices(); i++)
  {
    sectorInfo->GetTuple(i, slimits);

    // check to see if the point is in the window
    if (!this->PointInWindow(slimits, sdimDC, textPosDC, viewport))
    {
      continue;
    }

    // check to see if the text will fit in the sector
    this->GetVertexLabel(
      i, numericData, stringData, uStringData, activeComp, numComps, string, sizeof(string));
    QString ResultString(string);

    double x[3];
    x[0] = textPosDC[0];
    x[1] = textPosDC[1];

    // Now, create the layout for the actual label...
    QString textString, testString;

    // Qt's coordinate system starts at the top left corner of the layout...
    // vtk has been using the text baseline as the starting point, so
    // we need to add a correction factor to account for the difference
    QFontMetricsF fontMetric(fontSpec);
    double baseline = fontMetric.ascent();

    // set ellipsis bounds for this piece of text
    // Note, don't use ellipsis unless at least 5 characters (w's) can be displayed...
    QString minString("wwwww");
#if (QT_VERSION <= QT_VERSION_CHECK(5, 11, 0))
    int minStringWidth = fontMetric.width(minString);
#else
    int minStringWidth = fontMetric.horizontalAdvance(minString);
#endif
    double allowedTextWidth = 0;
    if (sdimDC[0] > sdimDC[1])
    {
      if (sdimDC[0] < minStringWidth)
      {
        continue;
      }
      allowedTextWidth = static_cast<int>(sdimDC[0]);
    }
    else
    {
      if (sdimDC[1] < minStringWidth)
      {
        continue;
      }
      allowedTextWidth = static_cast<int>(sdimDC[1]);
    }
    // FIXME - This next step assumes no markup to the original text, which is probably a bad
    //  choice, but is necessary due to Qt's current methods for handling and computing
    //  rich text widths and ellipsis...
    //    QTextStream(&testString) << fontMetric.elidedText( QString::fromUtf8( ResultString.c_str()
    //    ), Qt::ElideRight, allowedTextWidth );
    QTextStream(&testString) << fontMetric.elidedText(
      ResultString, Qt::ElideRight, allowedTextWidth);
    QTextStream(&textString) << "<span>" << testString << "</span>";
    // end FIXME

    // check to see if the text will fit in the sector;
    //  if not, don't draw the label...
    if (sdimDC[0] > sdimDC[1])
    {
      if (sdimDC[1] < fontMetric.height())
        continue;
    }
    else
    {
      if (sdimDC[0] < fontMetric.height())
        continue;
    }

    double delta_x = 0., delta_y = 0.;

    switch (this->LabelTextProperty->GetJustification())
    {
      case VTK_TEXT_LEFT:
        break;
      case VTK_TEXT_CENTERED:
        // FIXME - The width is not correct for html encodings...
#if (QT_VERSION <= QT_VERSION_CHECK(5, 11, 0))
        delta_x = -(fontMetric.width(testString)) / 2.;
#else
        delta_x = -(fontMetric.horizontalAdvance(testString)) / 2.;
#endif
        break;
      case VTK_TEXT_RIGHT:
        // FIXME - The width is not correct for html encodings...
#if (QT_VERSION <= QT_VERSION_CHECK(5, 11, 0))
        delta_x = -fontMetric.width(testString);
#else
        delta_x = -fontMetric.horizontalAdvance(testString);
#endif
        break;
    }

    switch (this->LabelTextProperty->GetVerticalJustification())
    {
      case VTK_TEXT_TOP:
        break;
      case VTK_TEXT_CENTERED:
        delta_y = -(fontMetric.height()) / 2.;
        //        delta_y = -fontMetric.ascent()/2.;
        break;
      case VTK_TEXT_BOTTOM:
        delta_y = -baseline;
        break;
    }

    double h = this->WindowSize[1];

    // specify the clockwise text rotation angle
    double rotation = 0.;
    if (TextRotationArray)
    {
      TextRotationArray->GetTuple(i, &rotation);
      rotation *= -1.;
    }

    if (this->LabelTextProperty->GetShadow())
    {
      painter.save();

      int shOff[2];
      this->LabelTextProperty->GetShadowOffset(shOff);

      painter.translate(x[0], h - x[1]);

      // Make sure the shadow offset is an even number of pixels in x and y.
      // This allows the shadow text to render the same way as the main text.
      QTransform t;
      t.rotate(rotation);
      t.translate(shOff[0], -shOff[1]);
      QPointF pt = t.map(QPoint(0, 0));
      painter.translate(static_cast<int>(pt.x() + 0.5), static_cast<int>(pt.y() + 0.5));

      painter.rotate(rotation);
      painter.translate(delta_x, delta_y);

      double shadowColor[3];
      this->LabelTextProperty->GetShadowColor(shadowColor);

      QTextDocument textDocument;
      textDocument.setDocumentMargin(0);
      textDocument.setDefaultFont(fontSpec);
      QString shadowStyleSheet;
      QTextStream(&shadowStyleSheet)
        << "* { color: rgb( " << shadowColor[0] * 255 << ", " << shadowColor[1] * 255 << ", "
        << shadowColor[2] * 255 << " ) }";
      textDocument.setDefaultStyleSheet(shadowStyleSheet);
      textDocument.setHtml(textString);
      textDocument.drawContents(&painter);

      painter.restore();
    }

    painter.save();
    painter.translate(x[0], h - x[1]);
    painter.rotate(rotation);
    painter.translate(delta_x, delta_y);

    QTextDocument textDocument;
    textDocument.setDocumentMargin(0);
    textDocument.setDefaultFont(fontSpec);
    QString styleSheet;
    QTextStream(&styleSheet) << "* { color: rgb( " << fc[0] * 255 << ", " << fc[1] * 255 << ", "
                             << fc[2] * 255 << " ) }";
    textDocument.setDefaultStyleSheet(styleSheet);
    textDocument.setHtml(textString);
    textDocument.drawContents(&painter);

    painter.restore();
  }

  //   QFile file( "C:/src/qtfonts.png" );
  //   file.open( QIODevice::WriteOnly);
  //   this->QtImage->save(&file, "PNG");
  //   file.close();

  this->BuildTime.Modified();
}

bool vtkQtTreeRingLabelMapper::PointInWindow(
  double* sinfo, double* newDim, double* textPosDC, vtkViewport* viewport)
{
  double r = (0.5 * (sinfo[3] - sinfo[2])) + sinfo[2];
  double theta = sinfo[0] + (0.5 * (sinfo[1] - sinfo[0]));
  double x = r * cos(vtkMath::RadiansFromDegrees(theta));
  double y = r * sin(vtkMath::RadiansFromDegrees(theta));

  this->VCoord->SetViewport(viewport);
  this->VCoord->SetValue(x, y, 0.);
  int* dc = VCoord->GetComputedDisplayValue(nullptr);
  textPosDC[0] = dc[0];
  textPosDC[1] = dc[1];

  // Get the window extents
  vtkWindow* win = viewport->GetVTKWindow();
  const int* winSize = win->GetSize();

  bool return_value = true;
  if (dc[0] < 0 || dc[0] > winSize[0])
    return_value = false;
  if (dc[1] < 0 || dc[1] > winSize[1])
    return_value = false;

  double xlc = sinfo[2] * cos(vtkMath::RadiansFromDegrees(sinfo[0]));
  double xuc = sinfo[3] * cos(vtkMath::RadiansFromDegrees(sinfo[0]));
  double ylc = sinfo[2] * sin(vtkMath::RadiansFromDegrees(sinfo[0]));
  double yuc = sinfo[3] * sin(vtkMath::RadiansFromDegrees(sinfo[0]));
  this->VCoord->SetValue(xlc, ylc, 0.);
  int* dc1 = VCoord->GetComputedDisplayValue(nullptr);
  double dc1x = dc1[0];
  double dc1y = dc1[1];
  this->VCoord->SetValue(xuc, yuc, 0.);
  int* dc2 = VCoord->GetComputedDisplayValue(nullptr);
  double dc2x = dc2[0];
  double dc2y = dc2[1];
  double height = sqrt(((dc2x - dc1x) * (dc2x - dc1x)) + ((dc2y - dc1y) * (dc2y - dc1y)));

  double widthWC = r * vtkMath::RadiansFromDegrees(sinfo[1] - sinfo[0]);
  double width = widthWC * height / sqrt((xuc - xlc) * (xuc - xlc) + (yuc - ylc) * (yuc - ylc));
  newDim[0] = width;
  newDim[1] = height;

  // We are done with the coordinate, so release the viewport
  this->VCoord->SetViewport(nullptr);

  return return_value;
}

//------------------------------------------------------------------------------
void vtkQtTreeRingLabelMapper::SetSectorsArrayName(const char* name)
{
  this->SetInputArrayToProcess(0, 0, 0, vtkDataObject::FIELD_ASSOCIATION_VERTICES, name);
}

vtkTree* vtkQtTreeRingLabelMapper::GetInputTree()
{
  return vtkTree::SafeDownCast(this->GetExecutive()->GetInputData(0, 0));
}

void vtkQtTreeRingLabelMapper::PrintSelf(ostream& os, vtkIndent indent)
{
  this->Superclass::PrintSelf(os, indent);
  os << indent << "WindowSize: " << this->WindowSize[0] << "w x" << this->WindowSize[1] << "h\n";
  if (this->LabelTextProperty)
  {
    os << indent << "Label Text Property:\n";
    this->LabelTextProperty->PrintSelf(os, indent.GetNextIndent());
  }
  else
  {
    os << indent << "Label Text Property: (none)\n";
  }
  os << indent << "TextRotationArrayName: "
     << (this->TextRotationArrayName ? this->TextRotationArrayName : "(none)") << endl;
}

void vtkQtTreeRingLabelMapper::GetVertexLabel(vtkIdType vertex, vtkDataArray* numericData,
  vtkStringArray* stringData, int activeComp, int numComps, char* string, size_t stringSize)
{
  GetVertexLabel(
    vertex, numericData, stringData, nullptr, activeComp, numComps, string, stringSize);
}

void vtkQtTreeRingLabelMapper::GetVertexLabel(vtkIdType vertex, vtkDataArray* numericData,
  vtkStringArray* stringData, vtkUnicodeStringArray* uStringData, int activeComp, int numComps,
  char* string, size_t stringSize)
{
  char format[1024];
  double val;
  int j;
  if (numericData)
  {
    if (numComps == 1)
    {
      if (numericData->GetDataType() == VTK_CHAR)
      {
        if (strcmp(this->LabelFormat, "%c") != 0)
        {
          vtkErrorMacro(<< "Label format must be %c to use with char");
          string[0] = '\0';
          return;
        }
        snprintf(string, stringSize, this->LabelFormat,
          static_cast<char>(numericData->GetComponent(vertex, activeComp)));
      }
      else
      {
        snprintf(
          string, stringSize, this->LabelFormat, numericData->GetComponent(vertex, activeComp));
      }
    }
    else
    {
      strcpy(format, "(");
      strcat(format, this->LabelFormat);
      for (j = 0; j < (numComps - 1); j++)
      {
        snprintf(string, stringSize, format, numericData->GetComponent(vertex, j));
        strcpy(format, string);
        strcat(format, ", ");
        strcat(format, this->LabelFormat);
      }
      snprintf(string, stringSize, format, numericData->GetComponent(vertex, numComps - 1));
      strcat(string, ")");
    }
  }
  else if (stringData) // rendering string data
  {
    if (strcmp(this->LabelFormat, "%s") != 0)
    {
      vtkErrorMacro(<< "Label format must be %s to use with strings");
      string[0] = '\0';
      return;
    }
    snprintf(string, stringSize, this->LabelFormat, stringData->GetValue(vertex).c_str());
  }
  else if (uStringData) // rendering unicode string data
  {
    if (strcmp(this->LabelFormat, "%s") != 0)
    {
      vtkErrorMacro(<< "Label format must be %s to use with strings");
      string[0] = '\0';
      return;
    }
    snprintf(string, stringSize, this->LabelFormat, uStringData->GetValue(vertex).utf8_str());
  }
  else // Use the vertex id
  {
    val = static_cast<double>(vertex);
    snprintf(string, stringSize, this->LabelFormat, val);
  }
}

vtkMTimeType vtkQtTreeRingLabelMapper::GetMTime()
{
  vtkMTimeType filterMTime = this->MTime.GetMTime();
  if (this->Renderer)
  {
    vtkRenderWindow* rw = this->Renderer->GetRenderWindow();
    if (rw)
    {
      vtkMTimeType renWindMTime = rw->GetMTime();
      if (renWindMTime > filterMTime)
      {
        const int* rwSize = rw->GetSize();
        if (rwSize[0] != this->WindowSize[0] || rwSize[1] != this->WindowSize[1])
        {
          return renWindMTime;
        }
      }
    }
  }
  return filterMTime;
}
