// Copyright (c) 2020 OPEN CASCADE SAS
//
// This file is part of Open CASCADE Technology software library.
//
// This library is free software; you can redistribute it and/or modify it under
// the terms of the GNU Lesser General Public License version 2.1 as published
// by the Free Software Foundation, with special exception defined in the file
// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
// distribution for complete text of the license and disclaimer of any warranty.
//
// Alternatively, this file may be used under the terms of Open CASCADE
// commercial license or contractual agreement.

#include <SelectMgr_SelectionImageFiller.hxx>

#include <SelectMgr_ViewerSelector.hxx>

namespace
{
  //! Help class for filling pixel with random color.
  class GeneratedEntityColorFiller : public SelectMgr_SelectionImageFiller
  {
  public:
    GeneratedEntityColorFiller (Image_PixMap& thePixMap,
                                SelectMgr_ViewerSelector* theSelector)
    : SelectMgr_SelectionImageFiller (thePixMap, theSelector)
    {
      // generate per-entity colors in the order as they have been activated
      for (SelectMgr_SelectableObjectSet::Iterator anObjIter (theSelector->SelectableObjects()); anObjIter.More(); anObjIter.Next())
      {
        const Handle(SelectMgr_SelectableObject)& anObj = anObjIter.Value();
        for (SelectMgr_SequenceOfSelection::Iterator aSelIter (anObj->Selections()); aSelIter.More(); aSelIter.Next())
        {
          const Handle(SelectMgr_Selection)& aSel = aSelIter.Value();
          for (NCollection_Vector<Handle(SelectMgr_SensitiveEntity)>::Iterator aSelEntIter (aSel->Entities()); aSelEntIter.More(); aSelEntIter.Next())
          {
            const Handle(SelectMgr_SensitiveEntity)& aSens = aSelEntIter.Value();
            if (!myMapEntityColors.IsBound (aSens->BaseSensitive()))
            {
              Quantity_Color aColor;
              randomPastelColor (aColor);
              myMapEntityColors.Bind (aSens->BaseSensitive(), aColor);
            }
          }
        }
      }
    }

    virtual void Fill (const Standard_Integer theCol,
                       const Standard_Integer theRow,
                       const Standard_Integer thePicked) Standard_OVERRIDE
    {
      if (thePicked < 1
       || thePicked > myMainSel->NbPicked())
      {
        myImage->SetPixelColor (theCol, theRow, Quantity_Color(Quantity_NOC_BLACK));
        return;
      }

      const Handle(Select3D_SensitiveEntity)& aPickedEntity = myMainSel->PickedEntity (thePicked);
      Quantity_Color aColor (Quantity_NOC_BLACK);
      myMapEntityColors.Find (aPickedEntity, aColor);
      myImage->SetPixelColor (theCol, theRow, aColor);
    }

  protected:
    NCollection_DataMap<Handle(Select3D_SensitiveEntity), Quantity_Color> myMapEntityColors;
  };

  //! Help class for filling pixel with normalized depth of ray.
  class NormalizedDepthFiller : public SelectMgr_SelectionImageFiller
  {
  public:
    NormalizedDepthFiller (Image_PixMap& thePixMap,
                           SelectMgr_ViewerSelector* theSelector,
                           const Standard_Boolean theToInverse)
    : SelectMgr_SelectionImageFiller (thePixMap, theSelector),
      myDepthMin ( RealLast()),
      myDepthMax (-RealLast()),
      myToInverse(theToInverse)
    {
      myUnnormImage.InitZero (Image_Format_GrayF, thePixMap.SizeX(), thePixMap.SizeY());
    }

    //! Accumulate the data.
    virtual void Fill (const Standard_Integer theCol,
                       const Standard_Integer theRow,
                       const Standard_Integer thePicked) Standard_OVERRIDE
    {
      if (myUnnormImage.IsEmpty())
      {
        return;
      }

      if (thePicked < 1
       || thePicked > myMainSel->NbPicked())
      {
        myUnnormImage.ChangeValue<float> (theRow, theCol) = ShortRealLast();
        return;
      }

      const SelectMgr_SortCriterion& aSortCriterion = myMainSel->PickedData (thePicked);
      myUnnormImage.ChangeValue<float> (theRow, theCol) = float(aSortCriterion.Depth);
      myDepthMin = Min (myDepthMin, aSortCriterion.Depth);
      myDepthMax = Max (myDepthMax, aSortCriterion.Depth);
    }

    //! Normalize the depth values.
    virtual void Flush() Standard_OVERRIDE
    {
      float aFrom  = 0.0f;
      float aDelta = 1.0f;
      if (myDepthMin <= myDepthMax)
      {
        aFrom  = float(myDepthMin);
        aDelta = float(myDepthMax) - float(myDepthMin);
        if (aDelta <= ShortRealEpsilon())
        {
          aDelta = 1.0f;
        }
      }
      for (Standard_Size aRowIter = 0; aRowIter < myUnnormImage.SizeY(); ++aRowIter)
      {
        for (Standard_Size aColIter = 0; aColIter < myUnnormImage.SizeX(); ++aColIter)
        {
          float aDepth = myUnnormImage.Value<float> (aRowIter, aColIter);
          if (aDepth <= -ShortRealLast()
           || aDepth >=  ShortRealLast())
          {
            myImage->SetPixelColor (Standard_Integer(aColIter), Standard_Integer(aRowIter),
                                    Quantity_ColorRGBA (0.0f, 0.0f, 0.0f, 1.0f));
            continue;
          }

          float aNormDepth = (aDepth - aFrom) / aDelta;
          if (myToInverse)
          {
            aNormDepth = 1.0f - aNormDepth;
          }
          myImage->SetPixelColor (Standard_Integer(aColIter), Standard_Integer(aRowIter),
                                  Quantity_ColorRGBA (aNormDepth, aNormDepth, aNormDepth, 1.0f));
        }
      }
    }

  private:
    Image_PixMap     myUnnormImage;
    Standard_Real    myDepthMin;
    Standard_Real    myDepthMax;
    Standard_Boolean myToInverse;
  };

  //! Help class for filling pixel with unnormalized depth of ray.
  class UnnormalizedDepthFiller : public SelectMgr_SelectionImageFiller
  {
  public:
    UnnormalizedDepthFiller (Image_PixMap& thePixMap,
                             SelectMgr_ViewerSelector* theSelector)
    : SelectMgr_SelectionImageFiller (thePixMap, theSelector) {}

    virtual void Fill (const Standard_Integer theCol,
                       const Standard_Integer theRow,
                       const Standard_Integer thePicked) Standard_OVERRIDE
    {
      if (thePicked < 1
       || thePicked > myMainSel->NbPicked())
      {
        myImage->SetPixelColor (theCol, theRow, Quantity_ColorRGBA (0.0f, 0.0f, 0.0f, 1.0f));
        return;
      }

      const SelectMgr_SortCriterion& aSortCriterion = myMainSel->PickedData (thePicked);
      const float aDepth = float(aSortCriterion.Depth);
      myImage->SetPixelColor (theCol, theRow, Quantity_ColorRGBA (Graphic3d_Vec4 (aDepth, aDepth, aDepth, 1.0f)));
    }
  };

  //! Help class for filling pixel with color of detected object.
  class GeneratedOwnerColorFiller : public SelectMgr_SelectionImageFiller
  {
  public:
    GeneratedOwnerColorFiller (Image_PixMap& thePixMap,
                               SelectMgr_ViewerSelector* theSelector)
    : SelectMgr_SelectionImageFiller (thePixMap, theSelector)
    {
      // generate per-owner colors in the order as they have been activated
      for (SelectMgr_SelectableObjectSet::Iterator anObjIter (theSelector->SelectableObjects()); anObjIter.More(); anObjIter.Next())
      {
        const Handle(SelectMgr_SelectableObject)& anObj = anObjIter.Value();
        for (SelectMgr_SequenceOfSelection::Iterator aSelIter (anObj->Selections()); aSelIter.More(); aSelIter.Next())
        {
          const Handle(SelectMgr_Selection)& aSel = aSelIter.Value();
          for (NCollection_Vector<Handle(SelectMgr_SensitiveEntity)>::Iterator aSelEntIter (aSel->Entities()); aSelEntIter.More(); aSelEntIter.Next())
          {
            const Handle(SelectMgr_SensitiveEntity)& aSens   = aSelEntIter.Value();
            const Handle(SelectBasics_EntityOwner)&  anOwner = aSens->BaseSensitive()->OwnerId();
            if (!myMapOwnerColors.IsBound (anOwner))
            {
              Quantity_Color aColor;
              randomPastelColor (aColor);
              myMapOwnerColors.Bind (anOwner, aColor);
            }
          }
        }
      }
    }

    virtual void Fill (const Standard_Integer theCol,
                       const Standard_Integer theRow,
                       const Standard_Integer thePicked) Standard_OVERRIDE
    {
      if (thePicked < 1
       || thePicked > myMainSel->NbPicked())
      {
        myImage->SetPixelColor (theCol, theRow, Quantity_Color(Quantity_NOC_BLACK));
        return;
      }

      const Handle(SelectMgr_EntityOwner)& aPickedOwner = myMainSel->Picked (thePicked);
      Quantity_Color aColor (Quantity_NOC_BLACK);
      myMapOwnerColors.Find (aPickedOwner, aColor);
      myImage->SetPixelColor (theCol, theRow, aColor);
    }

  protected:
    NCollection_DataMap<Handle(SelectBasics_EntityOwner), Quantity_Color> myMapOwnerColors;
  };

  //! Help class for filling pixel with random color for each selection mode.
  class GeneratedSelModeColorFiller : public SelectMgr_SelectionImageFiller
  {
  public:
    GeneratedSelModeColorFiller (Image_PixMap& thePixMap,
                                 SelectMgr_ViewerSelector* theSelector)
    : SelectMgr_SelectionImageFiller (thePixMap, theSelector)
    {
      // generate standard modes in proper order, consider custom objects would use similar scheme
      myMapSelectionModeColors.Bind (     0, Quantity_NOC_WHITE);          // default (entire object selection)
      myMapSelectionModeColors.Bind (     1, Quantity_NOC_YELLOW);         // TopAbs_VERTEX
      myMapSelectionModeColors.Bind (     2, Quantity_NOC_GREEN);          // TopAbs_EDGE
      myMapSelectionModeColors.Bind (     3, Quantity_NOC_RED);            // TopAbs_WIRE
      myMapSelectionModeColors.Bind (     4, Quantity_NOC_BLUE1);          // TopAbs_FACE
      myMapSelectionModeColors.Bind (     5, Quantity_NOC_CYAN1);          // TopAbs_SHELL
      myMapSelectionModeColors.Bind (     6, Quantity_NOC_PURPLE);         // TopAbs_SOLID
      myMapSelectionModeColors.Bind (     7, Quantity_NOC_MAGENTA1);       // TopAbs_COMPSOLID
      myMapSelectionModeColors.Bind (     8, Quantity_NOC_BROWN);          // TopAbs_COMPOUND
      myMapSelectionModeColors.Bind (0x0010, Quantity_NOC_PINK);           // MeshVS_SMF_Volume
      myMapSelectionModeColors.Bind (0x001E, Quantity_NOC_LIMEGREEN);      // MeshVS_SMF_Element
      myMapSelectionModeColors.Bind (0x001F, Quantity_NOC_DARKOLIVEGREEN); // MeshVS_SMF_All
      myMapSelectionModeColors.Bind (0x0100, Quantity_NOC_GOLD);           // MeshVS_SMF_Group
    }

    virtual void Fill (const Standard_Integer theCol,
                       const Standard_Integer theRow,
                       const Standard_Integer thePicked) Standard_OVERRIDE
    {
      if (thePicked < 1
       || thePicked > myMainSel->NbPicked())
      {
        myImage->SetPixelColor (theCol, theRow, Quantity_Color (Quantity_NOC_BLACK));
        return;
      }

      Standard_Integer aSelectionMode = -1;
      const Handle(SelectMgr_SelectableObject)& aSelectable = myMainSel->Picked       (thePicked)->Selectable();
      const Handle(Select3D_SensitiveEntity)&   anEntity    = myMainSel->PickedEntity (thePicked);
      for (SelectMgr_SequenceOfSelection::Iterator aSelIter (aSelectable->Selections()); aSelIter.More(); aSelIter.Next())
      {
        const Handle(SelectMgr_Selection)& aSelection = aSelIter.Value();
        for (NCollection_Vector<Handle(SelectMgr_SensitiveEntity)>::Iterator aSelEntIter (aSelection->Entities()); aSelEntIter.More(); aSelEntIter.Next())
        {
          if (aSelEntIter.Value()->BaseSensitive() == anEntity)
          {
            aSelectionMode = aSelection->Mode();
            break;
          }
        }
      }
      if (aSelectionMode == -1)
      {
        myImage->SetPixelColor (theCol, theRow, Quantity_Color (Quantity_NOC_BLACK));
        return;
      }

      if (!myMapSelectionModeColors.IsBound (aSelectionMode))
      {
        Quantity_Color aColor;
        randomPastelColor (aColor);
        myMapSelectionModeColors.Bind (aSelectionMode, aColor);
      }

      const Quantity_Color& aColor = myMapSelectionModeColors.Find (aSelectionMode);
      myImage->SetPixelColor (theCol, theRow, aColor);
    }

  protected:
    NCollection_DataMap<Standard_Integer, Quantity_Color> myMapSelectionModeColors;
  };

  //! Help class for filling pixel with color of detected shape.
  class DetectedObjectColorFiller : public SelectMgr_SelectionImageFiller
  {
  public:
    DetectedObjectColorFiller (Image_PixMap& thePixMap,
                               SelectMgr_ViewerSelector* theSelector)
    : SelectMgr_SelectionImageFiller (thePixMap, theSelector) {}

    virtual void Fill (const Standard_Integer theCol,
                       const Standard_Integer theRow,
                       const Standard_Integer thePicked) Standard_OVERRIDE
    {
      Quantity_Color aColor (Quantity_NOC_BLACK);
      if (thePicked > 0
       && thePicked <= myMainSel->NbPicked())
      {
        const Handle(SelectMgr_SelectableObject)& aSelectable = myMainSel->Picked (thePicked)->Selectable();
        aColor = aSelectable->Attributes()->Color();
      }
      myImage->SetPixelColor (theCol, theRow, aColor);
    }
  };
}

// =======================================================================
// function : CreateFiller
// purpose  :
// =======================================================================
Handle(SelectMgr_SelectionImageFiller) SelectMgr_SelectionImageFiller::CreateFiller (Image_PixMap& thePixMap,
                                                                                     SelectMgr_ViewerSelector* theSelector,
                                                                                     StdSelect_TypeOfSelectionImage theType)
{
  switch (theType)
  {
    case StdSelect_TypeOfSelectionImage_NormalizedDepth:
    case StdSelect_TypeOfSelectionImage_NormalizedDepthInverted:
    {
      return new NormalizedDepthFiller (thePixMap, theSelector, theType == StdSelect_TypeOfSelectionImage_NormalizedDepthInverted);
    }
    case StdSelect_TypeOfSelectionImage_UnnormalizedDepth:
    {
      return new UnnormalizedDepthFiller (thePixMap, theSelector);
    }
    case StdSelect_TypeOfSelectionImage_ColoredDetectedObject:
    {
      return new DetectedObjectColorFiller (thePixMap, theSelector);
    }
    case StdSelect_TypeOfSelectionImage_ColoredEntity:
    {
      return new GeneratedEntityColorFiller (thePixMap, theSelector);
    }
    case StdSelect_TypeOfSelectionImage_ColoredOwner:
    {
      return new GeneratedOwnerColorFiller (thePixMap, theSelector);
    }
    case StdSelect_TypeOfSelectionImage_ColoredSelectionMode:
    {
      return new GeneratedSelModeColorFiller (thePixMap, theSelector);
    }
  }
  return Handle(SelectMgr_SelectionImageFiller)();
}