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

  Program:   Visualization Toolkit
  Module:    vtkRandomLayoutStrategy.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.
-------------------------------------------------------------------------*/

#include "vtkRandomLayoutStrategy.h"

#include "vtkCellArray.h"
#include "vtkCellData.h"
#include "vtkDataArray.h"
#include "vtkFloatArray.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkMath.h"
#include "vtkObjectFactory.h"
#include "vtkPointData.h"
#include "vtkPoints.h"
#include "vtkTree.h"

vtkStandardNewMacro(vtkRandomLayoutStrategy);

vtkRandomLayoutStrategy::vtkRandomLayoutStrategy()
{
  this->RandomSeed = 123;
  this->GraphBounds[0] = this->GraphBounds[2] = this->GraphBounds[4] = -0.5;
  this->GraphBounds[1] = this->GraphBounds[3] = this->GraphBounds[5] =  0.5;
  this->AutomaticBoundsComputation = 0;
  this->ThreeDimensionalLayout = 1;
}

vtkRandomLayoutStrategy::~vtkRandomLayoutStrategy() = default;

// Random graph layout method
// Fixme: Temporary Hack
void vtkRandomLayoutStrategy::Layout() {};

void vtkRandomLayoutStrategy::SetGraph(vtkGraph *graph)
{
  if (graph == nullptr)
  {
    return;
  }

  // Generate bounds automatically if necessary. It's the same
  // as the graph bounds.
  if ( this->AutomaticBoundsComputation )
  {
    vtkPoints *pts = graph->GetPoints();
    pts->GetBounds(this->GraphBounds);
  }

  for (int i=0; i<3; i++)
  {
    if ( this->GraphBounds[2*i+1] <= this->GraphBounds[2*i] )
    {
      this->GraphBounds[2*i+1] = this->GraphBounds[2*i] + 1;
    }
  }

  // Generate the points, either x,y,0 or x,y,z
  vtkMath::RandomSeed(this->RandomSeed);

  vtkPoints *newPoints = vtkPoints::New();
  for (int i=0; i< graph->GetNumberOfVertices(); i++)
  {
    double x, y, z, r;
    r = vtkMath::Random();
    x = (this->GraphBounds[1] - this->GraphBounds[0])*r + this->GraphBounds[0];
    r = vtkMath::Random();
    y = (this->GraphBounds[3] - this->GraphBounds[2])*r + this->GraphBounds[2];
    if (this->ThreeDimensionalLayout)
    {
      r = vtkMath::Random();
      z = (this->GraphBounds[5] - this->GraphBounds[4])*r + this->GraphBounds[4];
    }
    else
    {
      z = 0;
    }
    newPoints->InsertNextPoint(x, y, z);
  }

  // Set the graph points.
  graph->SetPoints(newPoints);

  // Clean up.
  newPoints->Delete();
}

void vtkRandomLayoutStrategy::PrintSelf(ostream& os, vtkIndent indent)
{
  this->Superclass::PrintSelf(os,indent);

  os << indent << "RandomSeed: " << this->RandomSeed << endl;

  os << indent << "AutomaticBoundsComputation: "
     << (this->AutomaticBoundsComputation ? "On\n" : "Off\n");

  os << indent << "GraphBounds: \n";
  os << indent << "  Xmin,Xmax: (" << this->GraphBounds[0] << ", "
     << this->GraphBounds[1] << ")\n";
  os << indent << "  Ymin,Ymax: (" << this->GraphBounds[2] << ", "
     << this->GraphBounds[3] << ")\n";
  os << indent << "  Zmin,Zmax: (" << this->GraphBounds[4] << ", "
     << this->GraphBounds[5] << ")\n";

  os << indent << "Three Dimensional Layout: "
     << (this->ThreeDimensionalLayout ? "On\n" : "Off\n");
}
