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

  Program:   Visualization Toolkit
  Module:    vtkAMRBox.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.

=========================================================================*/
#include "vtkAMRBox.h"

#include "vtkUnsignedCharArray.h"
#include "vtkCellData.h"
#include "vtkType.h"
#include "vtkStructuredData.h"
#include "vtkImageData.h"
#include "vtkMath.h"

#include <algorithm>
#include <cstring>
#include <cassert>
#include <sstream>
#include <fstream>

//-----------------------------------------------------------------------------
vtkAMRBox::vtkAMRBox()
{
  this->Initialize();
}

//-----------------------------------------------------------------------------
vtkAMRBox::vtkAMRBox(const double* origin, const int* dimensions, const double* spacing, const double* globalOrigin,int gridDescription)
{
  int ndim[3];
  for( int d=0; d<3; ++d )
  {
    ndim[d] = dimensions[d]-1;
  }
  int lo[3], hi[3];
  for( int d=0; d<3; ++d )
  {
    lo[d] = spacing[d]>0? vtkMath::Round( (origin[d] - globalOrigin[d])/spacing[d] ): 0;
    hi[d] = lo[d] + ndim[d]-1;
  }

  this->SetDimensions( lo, hi, gridDescription);
}

//-----------------------------------------------------------------------------
vtkAMRBox::vtkAMRBox(
    int ilo,int jlo,int klo,
    int ihi,int jhi,int khi)
{
  this->BuildAMRBox( ilo, jlo, klo, ihi,jhi,khi);
}

//-----------------------------------------------------------------------------
vtkAMRBox::vtkAMRBox(const int *lo, const int *hi)
{
  this->BuildAMRBox( lo[0],lo[1],lo[2],hi[0],hi[1],hi[2] );
}

//-----------------------------------------------------------------------------
vtkAMRBox::vtkAMRBox(const int *dims)
{
  this->BuildAMRBox(dims[0],dims[2],dims[4],dims[1],dims[3],dims[5] );
}



//-----------------------------------------------------------------------------
void vtkAMRBox::BuildAMRBox(
    const int ilo, const int jlo, const int klo,
    const int ihi, const int jhi, const int khi  )
{
  this->Initialize();
  this->SetDimensions(ilo,jlo,klo,ihi,jhi,khi);
}

//-----------------------------------------------------------------------------
vtkAMRBox::vtkAMRBox(const vtkAMRBox &other)
{
  *this = other;
}

//-----------------------------------------------------------------------------
vtkAMRBox &vtkAMRBox::operator=(const vtkAMRBox &other)
{
 assert( "pre: AMR Box instance is invalid" && !other.IsInvalid() );

  if (this==&other) return *this;
  for(int i=0; i<3; i++)
  {
    this->LoCorner[i] = other.LoCorner[i];
    this->HiCorner[i] = other.HiCorner[i];
  }
  return *this;
}

//-----------------------------------------------------------------------------
void vtkAMRBox::Initialize( )
{
  for( int i=0; i < 3; ++i )
  {
    this->LoCorner[ i ] = 0;
    this->HiCorner[ i ] = 0;
  }
}

//-----------------------------------------------------------------------------
void vtkAMRBox::SetDimensions(
    int ilo,int jlo,int klo,
    int ihi,int jhi,int khi, int desc)
{
  assert (ihi-ilo>=-1 && jhi-jlo>=-1 && khi-klo>=-1);
  this->LoCorner[0]= ilo;
  this->LoCorner[1]= jlo;
  this->LoCorner[2]= klo;
  this->HiCorner[0]= ihi;
  this->HiCorner[1]= jhi;
  this->HiCorner[2]= khi;

  switch( desc )
  {
    case VTK_XY_PLANE:
      this->HiCorner[2] = this->LoCorner[2]-1;
      break;
    case VTK_XZ_PLANE:
      this->HiCorner[1] = this->LoCorner[1]-1;
      break;
    case VTK_YZ_PLANE:
      this->HiCorner[0] = this->LoCorner[0]-1;
      break;
  }
}

//-----------------------------------------------------------------------------
void vtkAMRBox::SetDimensions(const int *lo, const int *hi, int desc)
{
  this->SetDimensions(
      lo[0],lo[1],lo[2],
      hi[0],hi[1],hi[2], desc);
}

//-----------------------------------------------------------------------------
void vtkAMRBox::SetDimensions(const int *dims, int desc)
{
  this->SetDimensions(
      dims[0],dims[2],dims[4],
      dims[1],dims[3],dims[5], desc);
}

//-----------------------------------------------------------------------------
void vtkAMRBox::GetDimensions(int *lo, int *hi) const
{
 assert( "pre: AMR Box instance is invalid" && !this->IsInvalid() );
  for (int q=0; q < 3; ++q)
  {
    lo[q]=this->LoCorner[q];
    hi[q]=this->HiCorner[q];
  }
}

//-----------------------------------------------------------------------------
void vtkAMRBox::GetDimensions(int dims[6]) const
{
  assert( "pre: AMR Box instance is invalid" && !this->IsInvalid() );
  dims[0]=this->LoCorner[0];
  dims[1]=this->HiCorner[0];
  dims[2]=this->LoCorner[1];
  dims[3]=this->HiCorner[1];
  dims[4]=this->LoCorner[2];
  dims[5]=this->HiCorner[2];
}

//-----------------------------------------------------------------------------
void vtkAMRBox::GetValidHiCorner(int *hi) const
{
  assert( "pre: AMR Box instance is invalid" && !this->IsInvalid() );
  for (int q=0; q < 3; ++q)
  {
    hi[q] = this->EmptyDimension(q)? this->LoCorner[q]: this->HiCorner[q];
  }
}

//-----------------------------------------------------------------------------
void vtkAMRBox::GetBoxOrigin(const vtkAMRBox& extent, const double X0[3], const double spacing[3],double x0[3])
{
  assert( "pre: input array is nullptr" && (x0 != nullptr) );
  x0[0] = x0[1] = x0[2] = 0.0;

  for( int i=0; i < 3; ++i )
  {
    x0[i] = X0[i]+ extent.GetLoCorner()[i]*spacing[i];
  }
}


//-----------------------------------------------------------------------------
void vtkAMRBox::GetBounds(const vtkAMRBox& extent, const double origin[3], const double spacing[3],  double bounds[6])
{
  int i, j;
  for( i=0, j=0; i < 3; ++i )
  {
    bounds[ j++ ] = origin[i]+extent.LoCorner[i]*spacing[i];
    bounds[ j++ ] = origin[i]+(extent.HiCorner[i]+1)*spacing[i];
  }
}

//-----------------------------------------------------------------------------
bool vtkAMRBox::HasPoint(const vtkAMRBox& box, const double origin[3], const double spacing[3],  double x, double y,  double z )
{
  assert( "pre: AMR Box instance is invalid" && !box.IsInvalid() );

  double bb[6];
  vtkAMRBox::GetBounds(box,origin, spacing,bb);
  double min[3]={bb[0],bb[2],bb[4]};
  double max[3]={bb[1],bb[3],bb[5]};

  if( x >= min[0] && x <= max[0] &&
      y >= min[1] && y <= max[1] &&
      z >= min[2] && z <= max[2]   )
  {
    return true;
  }
  return false;

}

//-----------------------------------------------------------------------------
bool vtkAMRBox::operator==(const vtkAMRBox &other) const
{
  if ((this->Empty() && other.Empty())
      ||(this->LoCorner[0]==other.LoCorner[0]
         && this->LoCorner[1]==other.LoCorner[1]
         && this->LoCorner[2]==other.LoCorner[2]
         && this->HiCorner[0]==other.HiCorner[0]
         && this->HiCorner[1]==other.HiCorner[1]
         && this->HiCorner[2]==other.HiCorner[2]))
  {
    return true;
  }
  return false;
}

//-----------------------------------------------------------------------------
ostream &vtkAMRBox::Print(ostream &os) const
{
  os << "-D AMR box => "
     << "Low: ("  << this->LoCorner[0]
     << ","  << this->LoCorner[1]
     << ","  << this->LoCorner[2]
     << ") High: (" << this->HiCorner[0]
     << ","  << this->HiCorner[1]
     << ","  << this->HiCorner[2]
     << ")";
  return os;
}

//-----------------------------------------------------------------------------
void vtkAMRBox::Serialize( unsigned char*& buffer, vtkIdType& bytesize)
{
  assert( "pre: input buffer is expected to be nullptr" && (buffer==nullptr) );

  bytesize       = vtkAMRBox::GetBytesize();
  buffer         = new unsigned char[ bytesize ];
  assert( buffer != nullptr );

  // STEP 0: set pointer to traverse the buffer
  unsigned char* ptr = buffer;

  // STEP 7: serialize the low corner
  std::memcpy(ptr, &(this->LoCorner), 3*sizeof(int) );
  ptr += 3*sizeof( int );

  // STEP 8: serialize the high corner
  std::memcpy(ptr, &(this->HiCorner), 3*sizeof(int) );
}

//-----------------------------------------------------------------------------
void vtkAMRBox::Serialize( int* buffer) const
{
  memcpy(buffer,  this->LoCorner, 3*sizeof(int));
  memcpy(buffer+3, this->HiCorner, 3*sizeof(int));
}

//-----------------------------------------------------------------------------
void vtkAMRBox::Deserialize(
    unsigned char* buffer, const vtkIdType& vtkNotUsed(bytesize) )
{
  assert( "pre: input buffer is nullptr" && (buffer != nullptr) );

  // STEP 0: set pointer to traverse the buffer
  unsigned char *ptr = buffer;


  // STEP 7: de-serialize the low corner
  std::memcpy( &(this->LoCorner), ptr, 3*sizeof(int) );
  ptr += 3*sizeof( int );

  // STEP 8: de-serialize the high corner
  std::memcpy(&(this->HiCorner), ptr,  3*sizeof(int) );
}


//-----------------------------------------------------------------------------
bool vtkAMRBox::IntersectBoxAlongDimension(const vtkAMRBox &other, const int q)
{
  assert( "pre: dimension is out-of-bounds!" && (q >= 0) && (q <= 2) );
  bool e1 = this->EmptyDimension(q);
  bool e2 = other.EmptyDimension(q);
  if (e1 && e2)
  {
    return true;
  }
  if (e1 || e2)
  {
    return false;
  }
  if( this->LoCorner[q] <= other.LoCorner[q] )
  {
    this->LoCorner[q] = other.LoCorner[q];
  }
  if (this->HiCorner[q] >= other.HiCorner[q])
  {
    this->HiCorner[q] = other.HiCorner[q];
  }
  if (this->LoCorner[q] > this->HiCorner[q])
  {
    return false;
  }
  return true;
}

bool vtkAMRBox::Intersect(const vtkAMRBox &other)
{
  if( !this->IntersectBoxAlongDimension(other,0) ||
      !this->IntersectBoxAlongDimension(other,1) ||
      !this->IntersectBoxAlongDimension(other,2) )
  {
    return false;
  }
  return true;
}


int vtkAMRBox::GetCellLinearIndex(const vtkAMRBox& box, const int i, const int j, const int k, int dim[3])
{
  // Convert to local numbering
  int I[3]={  i-box.GetLoCorner()[0],
              j-box.GetLoCorner()[1],
              k-box.GetLoCorner()[2]};

  // Get Cell sizes
  int N[3] = {dim[0]-1, dim[1]-1,dim[2]-1};

  // Reduce the sizes and indices to those
  // that correspond to the non-null dimensions
  int nd(0);
  for(int d=0; d<3; d++)
  {
    if(!box.EmptyDimension(d))
    {
      N[nd] = N[d];
      I[nd] = I[d];
      assert(I[nd]>=0 && I[nd]<N[nd]);
      nd++;
    }
  }

  int idx=0;
  for(int d=nd-1; d>=0; d--)
  {
    idx= idx*N[d]+I[d];
  }
  return idx;
}



void vtkAMRBox::Coarsen(int r)
{
  assert( "pre: Input refinement ratio must be >= 2" && (r >= 2)  );
  assert( "pre: AMR Box instance is invalid" && !this->IsInvalid() );

  if( this->Empty() )
  {
    std::cerr << "WARNING: tried refining an empty AMR box!\n";
    std::cerr << "FILE:" << __FILE__ << std::endl;
    std::cerr << "LINE:" << __LINE__ << std::endl;
    std::cerr.flush();
    return;
  }
  for(int q=0; q < 3; ++q )
  {
    if(this->EmptyDimension(q))
    {
      continue;
    }
    this->LoCorner[q]=( (this->LoCorner[q] < 0)?
            -abs(this->LoCorner[q]+1)/r-1 : this->LoCorner[q]/r);
    this->HiCorner[q]=( this->HiCorner[q]<0 ?
            -abs(this->HiCorner[q]+1)/r-1 : this->HiCorner[q]/r);
  }
  assert( "post: Coarsened AMR box should not be empty!" && !this->Empty() );
  assert( "post: Coarsened AMR Box instance is invalid" && !this->IsInvalid() );
}

void vtkAMRBox::Refine(int r)
{
  assert( "pre: Input refinement ratio must be >= 1" && (r >= 1)  );
  assert( "pre: AMR Box instance is invalid" && !this->IsInvalid() );

  if( this->Empty() )
  {
    std::cerr << "WARNING: tried refining an empty AMR box!\n";
    std::cerr << "FILE:" << __FILE__ << std::endl;
    std::cerr << "LINE:" << __LINE__ << std::endl;
    std::cerr.flush();
    return;
  }
  for(int q=0; q < 3; ++q )
  {
    if(!this->EmptyDimension(q))
    {
      this->LoCorner[q]=this->LoCorner[q]*r;
      this->HiCorner[q]=(this->HiCorner[q]+1)*r-1;
    }
  }
  assert( "post: Refined AMR box should not be empty!" && !this->Empty() );
  assert( "post: Refined AMR Box instance is invalid" && !this->IsInvalid() );

}

//-----------------------------------------------------------------------------
bool vtkAMRBox::DoesBoxIntersectAlongDimension(
      const vtkAMRBox &other, const int q) const
{
  if(this->EmptyDimension(q) && other.EmptyDimension(q))
  {
    return true;
  }
  int minVal = 0;
  int maxVal = 0;
  minVal = (this->LoCorner[q] < other.LoCorner[q]) ?
      other.LoCorner[q] : this->LoCorner[q];
  maxVal = (this->HiCorner[q] > other.HiCorner[q]) ?
      other.HiCorner[q] : this->HiCorner[q];

  if (minVal >= maxVal)
  {
    return false;
  }
  return true;
}


bool vtkAMRBox::DoesIntersect(const vtkAMRBox &other) const
{
  assert( "pre: AMR Box instance is invalid" && !this->IsInvalid() );
  if (this->Empty())
  {
    return false;
  }
  if (other.Empty())
  {
    return false;
  }
  if( !this->DoesBoxIntersectAlongDimension(other,0) ||
      !this->DoesBoxIntersectAlongDimension(other,1) ||
      !this->DoesBoxIntersectAlongDimension(other,2) )
  {
    return false;
  }
  return true;
}

int vtkAMRBox::ComputeStructuredCoordinates(const vtkAMRBox& box, const double dataOrigin[3],
                                 const double h[3], const double x[3], int ijk[3],  double pcoords[3])
{
  double origin[3];
  vtkAMRBox::GetBoxOrigin(box,dataOrigin,h,origin);

  int num[3];
  box.GetNumberOfNodes(num);
  int extent[6] = {0,num[0]-1,0,num[1]-1,0,num[2]-1};

  double bounds[6];
  vtkAMRBox::GetBounds(box,dataOrigin,h,bounds);

  return vtkImageData::ComputeStructuredCoordinates(x,ijk,pcoords,extent, h, origin,bounds);
}

//------------------------------------------------------------------------------
void vtkAMRBox::GetGhostVector(int r, int nghost[6]) const
{
  // STEP 0: initialize nghost
  for( int i=0; i < 3; ++i )
  {
    nghost[i*2] = nghost[i*2+1] = 0;
  }

  // STEP 1: compute number of ghost layers along each dimension's min and max.
  // Detecting partially overlapping boxes is based on the following:
  // Cell location k at level L-1 holds the range [k*r,k*r+(r-1)] of
  // level L, where r is the refinement ratio. Consequently, if the
  // min extent of the box is greater than k*r or if the max extent
  // of the box is less than k*r+(r-1), then the grid partially overlaps.

  vtkAMRBox coarsenedBox = *this;
  coarsenedBox.Coarsen(r);
  for( int i=0; i < 3; ++i )
  {
    if(!this->EmptyDimension(i))
    {
      int minRange[2];
      minRange[0] = coarsenedBox.LoCorner[i]*r;
      minRange[1] = coarsenedBox.LoCorner[i]*r + (r-1);
      if( this->LoCorner[i] > minRange[0] )
      {
        nghost[i*2]=(minRange[1]+1)- this->LoCorner[i];
      }

      int maxRange[2];
      maxRange[0] = coarsenedBox.HiCorner[i]*r;
      maxRange[1] = coarsenedBox.HiCorner[i]*r + (r-1);
      if( this->HiCorner[i] < maxRange[1] )
      {
        nghost[i*2+1] = this->HiCorner[i]-(maxRange[0]-1);
      }
    }
  } // END for all dimensions
}

void vtkAMRBox::RemoveGhosts(int r)
{
  // Detecting partially overlapping boxes is based on the following:
  // Cell location k at level L-1 holds the range [k*r,k*r+(r-1)] of
  // level L, where r is the refinement ratio. Consequently, if the
  // min extent of the box is greater than k*r or if the max extent
  // of the box is less than k*r+(r-1), then the grid partially overlaps.
  vtkAMRBox coarsenedBox = *this;
  coarsenedBox.Coarsen(r);
  for( int i=0; i < 3; ++i )
  {
    if(!this->EmptyDimension(i))
    {
      int minRange[2];
      minRange[0] = coarsenedBox.LoCorner[i]*r;
      minRange[1] = coarsenedBox.LoCorner[i]*r + (r-1);
      if( this->LoCorner[i] > minRange[0] )
      {
        this->LoCorner[i]=(minRange[1]+1);
      }

      int maxRange[2];
      maxRange[0] = coarsenedBox.HiCorner[i]*r;
      maxRange[1] = coarsenedBox.HiCorner[i]*r + (r-1);
      if( this->HiCorner[i] < maxRange[1] )
      {
        this->HiCorner[i] = (maxRange[0]-1);
      }
    }
  } // END for all dimensions
}


int vtkAMRBox::ComputeDimension() const
{
 int dim(3);
 for(int i=0;i<3; i++)
 {
   if(this->EmptyDimension(i))
   {
     dim--;
   }
 }
 return( dim );
}

void vtkAMRBox::GetNumberOfCells(int ext[3]) const
{
  ext[0] = this->HiCorner[0]-this->LoCorner[0]+1;
  ext[1] = this->HiCorner[1]-this->LoCorner[1]+1;
  ext[2] = this->HiCorner[2]-this->LoCorner[2]+1;
}

vtkIdType vtkAMRBox::GetNumberOfCells() const
{
  int cellExtent[3];
  this->GetNumberOfCells(cellExtent);
  int numCells = 0;
  for( int i=0; i < 3; ++i )
  {
    if( numCells == 0 )
    {
      numCells = cellExtent[i];
    }
    else if( cellExtent[i] != 0 )
    {
      numCells *= cellExtent[i];
    }
  }
  return( numCells );
}

//-----------------------------------------------------------------------------
bool vtkAMRBox::Contains(int i,int j,int k) const
{
  int ijk[3] = {i,j,k};
  return this->Contains(ijk);
}


//-----------------------------------------------------------------------------
bool vtkAMRBox::Contains(const int *I) const
{
  bool res(true);
  for(int i=0; i<3; i++)
  {
    if (!this->EmptyDimension(i) &&  (this->LoCorner[i]>I[i] || this->HiCorner[i]<I[i]))
    {
      res = false;
    }
  }
  return res;
}

//-----------------------------------------------------------------------------
bool vtkAMRBox::Contains(const vtkAMRBox &other) const
{
  const int *lo=other.LoCorner;
  const int *hi=other.HiCorner;
  return this->Contains(lo) && this->Contains(hi);
}

void vtkAMRBox::GetNumberOfNodes(int *ext) const
{
  ext[0] = this->HiCorner[0]-this->LoCorner[0]+2;
  ext[1] = this->HiCorner[1]-this->LoCorner[1]+2;
  ext[2] = this->HiCorner[2]-this->LoCorner[2]+2;
  assert(ext[0]>=1 && ext[1]>=1 && ext[2]>=1);
}

//-----------------------------------------------------------------------------
vtkIdType vtkAMRBox::GetNumberOfNodes() const
{
  assert( "pre: AMR Box instance is invalid" && !this->IsInvalid() );
  int ext[3];
  this->GetNumberOfNodes( ext );
  int numNodes = 0;
  for( int i=0; i < 3; ++i )
  {
    if( numNodes == 0 )
    {
      numNodes = ext[i];
    }
    else if( ext[i] != 0 )
    {
      numNodes *= ext[i];
    }
  }
  return( numNodes );
}


//-----------------------------------------------------------------------------
void vtkAMRBox::Shift(int i, int j, int k)
{
  int ijk[3] = {i,j,k};
  this->Shift(ijk);
}

//-----------------------------------------------------------------------------
void vtkAMRBox::Shift(const int *ijk)
{
  for(int q=0; q < 3; ++q )
  {
    this->LoCorner[q] = this->LoCorner[q]+ijk[q];
    this->HiCorner[q] = this->HiCorner[q]+ijk[q];
  }
}

//-----------------------------------------------------------------------------
void vtkAMRBox::Grow(int byN)
{
  assert( "pre: AMR Box instance is invalid" && !this->IsInvalid() );
  // TODO: One question here is, should we allow negative indices?
  //       Or should we otherwise, ensure that the box is grown with
  //       bounds.
  for(int q=0; q < 3; ++q )
  {
    if(!this->EmptyDimension(q))
    {
      this->LoCorner[q]-=byN;
      this->HiCorner[q]+=byN;
    }
  }
  assert( "post: Grown AMR Box instance is invalid" && !this->IsInvalid() );
}

//-----------------------------------------------------------------------------
void vtkAMRBox::Shrink(int byN)
{
  assert( "pre: AMR Box instance is invalid" && !this->IsInvalid() );
  // TODO: One question here is, should we allow negative indices?
  //       Or should we otherwise, ensure that the box is grown with
  //       bounds.
  for(int q=0; q < 3; ++q )
  {
    if(!this->EmptyDimension(q))
    {
      this->LoCorner[q]+=byN;
      this->HiCorner[q]-=byN;
    }
  }
  assert( "post: Grown AMR Box instance is invalid" && !this->IsInvalid() );
}