// SPDX-FileCopyrightText: Copyright (c) Kitware Inc.
// SPDX-License-Identifier: BSD-3-Clause
#include "vtkPVTransposeTable.h"

#include "vtkAbstractArray.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkNew.h"
#include "vtkObjectFactory.h"
#include "vtkTable.h"

#include <set>
#include <string>

//----------------------------------------------------------------------------
// Internal class that holds selected columns
class PVTransposeTableInternal
{
public:
  bool Clear()
  {
    if (this->Columns.empty())
    {
      return false;
    }
    this->Columns.clear();
    return true;
  }

  bool Has(const std::string& v) { return this->Columns.find(v) != this->Columns.end(); }

  bool Set(const std::string& v)
  {
    if (this->Has(v))
    {
      return false;
    }
    this->Columns.insert(v);
    return true;
  }

  std::set<std::string> Columns;
};

//----------------------------------------------------------------------------
vtkStandardNewMacro(vtkPVTransposeTable);

//----------------------------------------------------------------------------
vtkPVTransposeTable::vtkPVTransposeTable()
{
  this->Internal = new PVTransposeTableInternal();
  this->DoNotTranspose = false;
}

//----------------------------------------------------------------------------
vtkPVTransposeTable::~vtkPVTransposeTable()
{
  delete this->Internal;
}

//----------------------------------------------------------------------------
void vtkPVTransposeTable::EnableAttributeArray(const char* arrName)
{
  if (arrName)
  {
    if (this->Internal->Set(arrName))
    {
      this->Modified();
    }
  }
}

//----------------------------------------------------------------------------
void vtkPVTransposeTable::ClearAttributeArrays()
{
  if (this->Internal->Clear())
  {
    this->Modified();
  }
}

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

//----------------------------------------------------------------------------
int vtkPVTransposeTable::RequestData(
  vtkInformation*, vtkInformationVector** inputVector, vtkInformationVector* outputVector)
{
  vtkTable* inTable = vtkTable::GetData(inputVector[0]);
  vtkTable* outTable = vtkTable::GetData(outputVector, 0);

  if (inTable->GetNumberOfColumns() == 0)
  {
    return 1;
  }

  // Construct a table that holds only the selected columns
  vtkNew<vtkTable> subTable;
  if (this->GetUseIdColumn())
  {
    if (vtkAbstractArray* arr = inTable->GetColumnByName(this->GetIdColumnName()))
    {
      subTable->AddColumn(arr);
    }
  }

  // To avoid alphabetical sorting issue, we need to take care of the
  // order of the column we add in the table
  for (vtkIdType c = 0; c < inTable->GetNumberOfColumns(); c++)
  {
    vtkAbstractArray* arr = inTable->GetColumn(c);
    if (arr)
    {
      if (arr->GetName() != this->GetIdColumnName() && this->Internal->Has(arr->GetName()))
      {
        subTable->AddColumn(arr);
      }
    }
  }

  // Now transpose the subtable
  if (subTable->GetNumberOfColumns() > 0 && !this->DoNotTranspose)
  {
    vtkNew<vtkTransposeTable> transpose;
    transpose->SetInputData(subTable.GetPointer());
    transpose->SetAddIdColumn(this->GetAddIdColumn());
    transpose->SetIdColumnName(this->GetIdColumnName());
    transpose->SetUseIdColumn(this->GetUseIdColumn());
    transpose->Update();

    outTable->ShallowCopy(transpose->GetOutput());
  }
  if (this->DoNotTranspose)
  {
    outTable->ShallowCopy(subTable.GetPointer());
  }

  return 1;
}
