/*=========================================================================
 *
 *  Copyright NumFOCUS
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *         https://www.apache.org/licenses/LICENSE-2.0.txt
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *=========================================================================*/

#include "itkOFFMeshIO.h"

#include "itksys/SystemTools.hxx"
#include "itkMakeUniqueForOverwrite.h"

namespace itk
{
OFFMeshIO::OFFMeshIO()
{
  this->AddSupportedWriteExtension(".off");
  this->SetByteOrderToBigEndian();
  m_PointsStartPosition = StreamOffsetType{};
  m_TriangleCellType = true;
}

OFFMeshIO::~OFFMeshIO() = default;

bool
OFFMeshIO::CanReadFile(const char * fileName)
{
  if (!itksys::SystemTools::FileExists(fileName, true))
  {
    return false;
  }

  if (itksys::SystemTools::GetFilenameLastExtension(fileName) != ".off")
  {
    return false;
  }

  return true;
}

bool
OFFMeshIO::CanWriteFile(const char * fileName)
{
  if (itksys::SystemTools::GetFilenameLastExtension(fileName) != ".off")
  {
    return false;
  }

  return true;
}

void
OFFMeshIO::OpenFile()
{
  if (this->m_FileName.empty())
  {
    itkExceptionMacro("No input FileName");
  }

  if (!itksys::SystemTools::FileExists(m_FileName.c_str()))
  {
    itkExceptionMacro("File " << this->m_FileName << " does not exist");
  }

  // Read file as ascii
  // Due to the windows doesn't work well for tellg() and seekg() for ASCII mode, hence we
  // open the file with std::ios::binary
  m_InputFile.open(this->m_FileName.c_str(), std::ios_base::in | std::ios::binary);

  // Test whether the file was opened
  if (!m_InputFile.is_open())
  {
    itkExceptionMacro("Unable to open file " << this->m_FileName);
  }
}

void
OFFMeshIO::CloseFile()
{
  if (m_InputFile.is_open())
  {
    m_InputFile.close();
  }
}

void
OFFMeshIO::ReadMeshInformation()
{
  // Define input file stream and attach it to input file
  OpenFile();

  // Read and analyze the first line in the file
  std::string line;

  // The OFF file must containe "OFF"
  std::getline(m_InputFile, line, '\n'); // delimiter is '\n'
  if (line.find("OFF") == std::string::npos)
  {
    itkExceptionMacro("Error, the file doesn't begin with keyword \"OFF\" ");
  }

  // If the file is binary file, it contains "BINARY"
  if (line.find("BINARY") != std::string::npos)
  {
    this->m_FileType = IOFileEnum::BINARY;
  }
  else
  {
    this->m_FileType = IOFileEnum::ASCII;
  }

  // Read and Set point dimension
  if (line.find("nOFF") != std::string::npos)
  {
    m_InputFile >> this->m_PointDimension;
    ++m_PointDimension;
  }
  else if (line.find("4OFF") != std::string::npos)
  {
    this->m_PointDimension = 4;
  }
  else
  {
    this->m_PointDimension = 3;
  }

  // Ignore comment lines
  std::getline(m_InputFile, line, '\n');
  while (line.find("#") != std::string::npos)
  {
    std::getline(m_InputFile, line, '\n');
  }

  // Read points and cells information
  if (this->m_FileType == IOFileEnum::ASCII)
  {
    // Put the last line with output '#' into a stringstream.
    std::stringstream ss;
    ss << line;

    // Read number of points
    ss >> this->m_NumberOfPoints;

    // Read number of cells
    ss >> this->m_NumberOfCells;

    // Read number of edges
    unsigned int numberOfEdges = 0;
    ss >> numberOfEdges;

    // Read points start position in the file
    m_PointsStartPosition = m_InputFile.tellg();

    for (SizeValueType id = 0; id < this->m_NumberOfPoints; ++id)
    {
      std::getline(m_InputFile, line, '\n');
    }

    // Set default cell component type
    this->m_CellBufferSize = this->m_NumberOfCells * 2;

    // Read each ecll's number of points and put them to cell buffer size
    unsigned int numberOfCellPoints = 0;
    for (SizeValueType id = 0; id < this->m_NumberOfCells; ++id)
    {
      m_InputFile >> numberOfCellPoints;
      this->m_CellBufferSize += numberOfCellPoints;
      std::getline(m_InputFile, line, '\n');

      if (numberOfCellPoints != 3)
      {
        m_TriangleCellType = false;
      }
    }
  }
  // Read points and cells information from binary mesh
  else if (this->m_FileType == IOFileEnum::BINARY)
  {
    // Read the number of points
    itk::uint32_t numberOfPoints;
    this->ReadBufferAsBinary(&numberOfPoints, m_InputFile, 1);
    this->m_NumberOfPoints = numberOfPoints;

    // Read the number of cells
    itk::uint32_t numberOfCells;
    this->ReadBufferAsBinary(&numberOfCells, m_InputFile, 1);
    this->m_NumberOfCells = numberOfCells;

    // Read number of edges
    itk::uint32_t numberOfEdges;
    this->ReadBufferAsBinary(&numberOfEdges, m_InputFile, 1);

    // Get points start position
    m_PointsStartPosition = m_InputFile.tellg();

    // Read points
    const auto numberOfCoordinates = this->m_NumberOfPoints * this->m_PointDimension;
    this->ReadBufferAsBinary(make_unique_for_overwrite<float[]>(numberOfCoordinates).get(),
                             m_InputFile,
                             this->m_NumberOfPoints * this->m_PointDimension);

    // Set default cell component type
    this->m_CellBufferSize = this->m_NumberOfCells * 2;

    // Read cells
    itk::uint32_t numberOfCellPoints = 0;
    const auto    cellsBuffer = make_unique_for_overwrite<itk::uint32_t[]>(this->m_NumberOfCells);
    for (unsigned long id = 0; id < this->m_NumberOfCells; ++id)
    {
      this->ReadBufferAsBinary(&numberOfCellPoints, m_InputFile, 1);
      this->m_CellBufferSize += numberOfCellPoints;
      this->ReadBufferAsBinary(cellsBuffer.get(), m_InputFile, numberOfCellPoints);
      if (numberOfCellPoints != 3)
      {
        m_TriangleCellType = false;
      }
    }
  }

  // Set default point component type
  this->m_PointComponentType = IOComponentEnum::FLOAT;

  // Set default cell component type
  this->m_CellComponentType = IOComponentEnum::UINT;

  // If number of points is not equal zero, update points
  if (this->m_NumberOfPoints)
  {
    this->m_UpdatePoints = true;
  }

  // If number of cells is not equal zero, update points
  if (this->m_NumberOfCells)
  {
    this->m_UpdateCells = true;
  }

  // Set default point pixel component and point pixel type
  this->m_PointPixelComponentType = IOComponentEnum::FLOAT;
  this->m_PointPixelType = IOPixelEnum::SCALAR;
  this->m_UpdatePointData = false;
  this->m_NumberOfPointPixelComponents = 1;

  // Set default cell pixel component and point pixel type
  this->m_CellPixelComponentType = IOComponentEnum::FLOAT;
  this->m_CellPixelType = IOPixelEnum::SCALAR;
  this->m_UpdateCellData = false;
  this->m_NumberOfCellPixelComponents = 1;
}

void
OFFMeshIO::ReadPoints(void * buffer)
{
  // Set file position to points start position
  m_InputFile.seekg(m_PointsStartPosition, std::ios::beg);

  // Read file according to ASCII or BINARY
  if (this->m_FileType == IOFileEnum::ASCII)
  {
    this->ReadBufferAsAscii(static_cast<float *>(buffer), m_InputFile, this->m_NumberOfPoints * this->m_PointDimension);
  }
  else if (this->m_FileType == IOFileEnum::BINARY)
  {
    this->ReadBufferAsBinary(
      static_cast<float *>(buffer), m_InputFile, this->m_NumberOfPoints * this->m_PointDimension);
  }
  else
  {
    itkExceptionMacro("Invalid file type (not ASCII or BINARY)");
  }
}

void
OFFMeshIO::ReadCells(void * buffer)
{
  const auto data = make_unique_for_overwrite<itk::uint32_t[]>(this->m_CellBufferSize - this->m_NumberOfCells);

  if (this->m_FileType == IOFileEnum::ASCII)
  {
    this->ReadCellsBufferAsAscii(data.get(), m_InputFile);
  }
  else if (this->m_FileType == IOFileEnum::BINARY)
  {
    this->ReadBufferAsBinary(data.get(), m_InputFile, this->m_CellBufferSize - this->m_NumberOfCells);
  }
  else
  {
    itkExceptionMacro("Invalid file type (not ASCII or BINARY)");
  }

  CloseFile();

  if (m_TriangleCellType)
  {
    this->WriteCellsBuffer(
      data.get(), static_cast<unsigned int *>(buffer), CellGeometryEnum::TRIANGLE_CELL, this->m_NumberOfCells);
  }
  else
  {
    this->WriteCellsBuffer(
      data.get(), static_cast<unsigned int *>(buffer), CellGeometryEnum::POLYGON_CELL, this->m_NumberOfCells);
  }
}

void
OFFMeshIO::ReadPointData(void * itkNotUsed(buffer))
{}

void
OFFMeshIO::ReadCellData(void * itkNotUsed(buffer))
{}

void
OFFMeshIO::WriteMeshInformation()
{
  // Check file name
  if (this->m_FileName.empty())
  {
    itkExceptionMacro("No Input FileName");
  }

  // Write to output file
  std::ofstream outputFile;
  if (this->m_FileType == IOFileEnum::ASCII)
  {
    outputFile.open(this->m_FileName.c_str(), std::ios::out);
  }
  else if (m_FileType == IOFileEnum::BINARY)
  {
    outputFile.open(this->m_FileName.c_str(), std::ios::out | std::ios::binary);
  }

  if (!outputFile.is_open())
  {
    itkExceptionMacro("Unable to open file\n"
                      "outputFilename= "
                      << this->m_FileName);
  }

  // Write Object file format header
  outputFile << "OFF " << std::endl;

  // Read points and cells information
  if (this->m_FileType == IOFileEnum::ASCII)
  {
    // Write number of points
    outputFile << this->m_NumberOfPoints << "    ";

    // Write number of cells
    outputFile << this->m_NumberOfCells << "    ";

    // Write number of edges
    unsigned int numberOfEdges = 0;
    outputFile << numberOfEdges << std::endl;
  }
  else if (this->m_FileType == IOFileEnum::BINARY)
  {
    // Write number of points
    auto numberOfPoints = static_cast<itk::uint32_t>(this->m_NumberOfPoints);
    this->WriteBufferAsBinary<itk::uint32_t>(&(numberOfPoints), outputFile, 1);

    // Write number of cells
    auto numberOfCells = static_cast<itk::uint32_t>(this->m_NumberOfCells);
    this->WriteBufferAsBinary<itk::uint32_t>(&(numberOfCells), outputFile, 1);

    // Write number of edges
    itk::uint32_t numberOfEdges = 0;
    this->WriteBufferAsBinary<itk::uint32_t>(&(numberOfEdges), outputFile, 1);
  }

  outputFile.close();
}

void
OFFMeshIO::WritePoints(void * buffer)
{
  // check file name
  if (this->m_FileName.empty())
  {
    itkExceptionMacro("No Input FileName");
  }

  // Write to output file
  std::ofstream outputFile;
  if (this->m_FileType == IOFileEnum::ASCII)
  {
    outputFile.open(this->m_FileName.c_str(), std::ios::app);
  }
  else if (m_FileType == IOFileEnum::BINARY)
  {
    outputFile.open(this->m_FileName.c_str(), std::ios::app | std::ios::binary);
  }

  if (!outputFile.is_open())
  {
    itkExceptionMacro("Unable to open file\n"
                      "outputFilename= "
                      << this->m_FileName);
  }

  // Write points
  if (this->m_FileType == IOFileEnum::ASCII)
  {
    switch (this->m_PointComponentType)
    {
      case IOComponentEnum::UCHAR:
      {
        WriteBufferAsAscii(static_cast<unsigned char *>(buffer), outputFile, m_NumberOfPoints, m_PointDimension);
        break;
      }
      case IOComponentEnum::CHAR:
      {
        WriteBufferAsAscii(static_cast<char *>(buffer), outputFile, m_NumberOfPoints, m_PointDimension);

        break;
      }
      case IOComponentEnum::USHORT:
      {
        WriteBufferAsAscii(static_cast<unsigned short *>(buffer), outputFile, m_NumberOfPoints, m_PointDimension);

        break;
      }
      case IOComponentEnum::SHORT:
      {
        WriteBufferAsAscii(static_cast<short *>(buffer), outputFile, m_NumberOfPoints, m_PointDimension);

        break;
      }
      case IOComponentEnum::UINT:
      {
        WriteBufferAsAscii(static_cast<unsigned int *>(buffer), outputFile, m_NumberOfPoints, m_PointDimension);

        break;
      }
      case IOComponentEnum::INT:
      {
        WriteBufferAsAscii(static_cast<int *>(buffer), outputFile, m_NumberOfPoints, m_PointDimension);

        break;
      }
      case IOComponentEnum::ULONG:
      {
        WriteBufferAsAscii(static_cast<unsigned long *>(buffer), outputFile, m_NumberOfPoints, m_PointDimension);

        break;
      }
      case IOComponentEnum::LONG:
      {
        WriteBufferAsAscii(static_cast<long *>(buffer), outputFile, m_NumberOfPoints, m_PointDimension);

        break;
      }
      case IOComponentEnum::ULONGLONG:
      {
        WriteBufferAsAscii(static_cast<unsigned long long *>(buffer), outputFile, m_NumberOfPoints, m_PointDimension);

        break;
      }
      case IOComponentEnum::LONGLONG:
      {
        WriteBufferAsAscii(static_cast<long long *>(buffer), outputFile, m_NumberOfPoints, m_PointDimension);

        break;
      }
      case IOComponentEnum::FLOAT:
      {
        WriteBufferAsAscii(static_cast<float *>(buffer), outputFile, m_NumberOfPoints, m_PointDimension);

        break;
      }
      case IOComponentEnum::DOUBLE:
      {
        WriteBufferAsAscii(static_cast<double *>(buffer), outputFile, m_NumberOfPoints, m_PointDimension);

        break;
      }
      case IOComponentEnum::LDOUBLE:
      {
        WriteBufferAsAscii(static_cast<long double *>(buffer), outputFile, m_NumberOfPoints, m_PointDimension);

        break;
      }
      default:
      {
        itkExceptionMacro("Unknown point pixel component type" << std::endl);
      }
    }
  }
  else if (this->m_FileType == IOFileEnum::BINARY)
  {
    switch (this->m_PointComponentType)
    {
      case IOComponentEnum::UCHAR:
      {
        WriteBufferAsBinary<float>(
          static_cast<unsigned char *>(buffer), outputFile, m_NumberOfPoints * m_PointDimension);
        break;
      }
      case IOComponentEnum::CHAR:
      {
        WriteBufferAsBinary<float>(static_cast<char *>(buffer), outputFile, m_NumberOfPoints * m_PointDimension);

        break;
      }
      case IOComponentEnum::USHORT:
      {
        WriteBufferAsBinary<float>(
          static_cast<unsigned short *>(buffer), outputFile, m_NumberOfPoints * m_PointDimension);

        break;
      }
      case IOComponentEnum::SHORT:
      {
        WriteBufferAsBinary<float>(static_cast<short *>(buffer), outputFile, m_NumberOfPoints * m_PointDimension);

        break;
      }
      case IOComponentEnum::UINT:
      {
        WriteBufferAsBinary<float>(
          static_cast<unsigned int *>(buffer), outputFile, m_NumberOfPoints * m_PointDimension);

        break;
      }
      case IOComponentEnum::INT:
      {
        WriteBufferAsBinary<float>(static_cast<int *>(buffer), outputFile, m_NumberOfPoints * m_PointDimension);

        break;
      }
      case IOComponentEnum::ULONG:
      {
        WriteBufferAsBinary<float>(
          static_cast<unsigned long *>(buffer), outputFile, m_NumberOfPoints * m_PointDimension);

        break;
      }
      case IOComponentEnum::LONG:
      {
        WriteBufferAsBinary<float>(static_cast<long *>(buffer), outputFile, m_NumberOfPoints * m_PointDimension);

        break;
      }
      case IOComponentEnum::ULONGLONG:
      {
        WriteBufferAsBinary<float>(
          static_cast<unsigned long long *>(buffer), outputFile, m_NumberOfPoints * m_PointDimension);

        break;
      }
      case IOComponentEnum::LONGLONG:
      {
        WriteBufferAsBinary<float>(static_cast<long long *>(buffer), outputFile, m_NumberOfPoints * m_PointDimension);

        break;
      }
      case IOComponentEnum::FLOAT:
      {
        WriteBufferAsBinary<float>(static_cast<float *>(buffer), outputFile, m_NumberOfPoints * m_PointDimension);

        break;
      }
      case IOComponentEnum::DOUBLE:
      {
        WriteBufferAsBinary<float>(static_cast<double *>(buffer), outputFile, m_NumberOfPoints * m_PointDimension);

        break;
      }
      case IOComponentEnum::LDOUBLE:
      {
        WriteBufferAsBinary<float>(static_cast<long double *>(buffer), outputFile, m_NumberOfPoints * m_PointDimension);

        break;
      }
      default:
      {
        itkExceptionMacro("Unknown point pixel component type" << std::endl);
      }
    }
  }

  outputFile.close();
}

void
OFFMeshIO::WriteCells(void * buffer)
{
  // Check file name
  if (this->m_FileName.empty())
  {
    itkExceptionMacro("No Input FileName");
  }

  // Write to output file
  std::ofstream outputFile;
  if (this->m_FileType == IOFileEnum::ASCII)
  {
    outputFile.open(this->m_FileName.c_str(), std::ios::app);
  }
  else if (m_FileType == IOFileEnum::BINARY)
  {
    outputFile.open(this->m_FileName.c_str(), std::ios::app | std::ios::binary);
  }

  if (!outputFile.is_open())
  {
    itkExceptionMacro("Unable to open file\n"
                      "outputFilename= "
                      << this->m_FileName);
  }

  // Write cells
  if (this->m_FileType == IOFileEnum::ASCII)
  {
    switch (this->m_CellComponentType)
    {
      case IOComponentEnum::UCHAR:
      {
        WriteCellsAsAscii(static_cast<unsigned char *>(buffer), outputFile);

        break;
      }
      case IOComponentEnum::CHAR:
      {
        WriteCellsAsAscii(static_cast<unsigned char *>(buffer), outputFile);

        break;
      }
      case IOComponentEnum::USHORT:
      {
        WriteCellsAsAscii(static_cast<unsigned short *>(buffer), outputFile);

        break;
      }
      case IOComponentEnum::SHORT:
      {
        WriteCellsAsAscii(static_cast<short *>(buffer), outputFile);

        break;
      }
      case IOComponentEnum::UINT:
      {
        WriteCellsAsAscii(static_cast<unsigned int *>(buffer), outputFile);

        break;
      }
      case IOComponentEnum::INT:
      {
        WriteCellsAsAscii(static_cast<int *>(buffer), outputFile);

        break;
      }
      case IOComponentEnum::ULONG:
      {
        WriteCellsAsAscii(static_cast<long *>(buffer), outputFile);

        break;
      }
      case IOComponentEnum::LONG:
      {
        WriteCellsAsAscii(static_cast<long *>(buffer), outputFile);

        break;
      }
      case IOComponentEnum::ULONGLONG:
      {
        WriteCellsAsAscii(static_cast<unsigned long long *>(buffer), outputFile);

        break;
      }
      case IOComponentEnum::LONGLONG:
      {
        WriteCellsAsAscii(static_cast<long long *>(buffer), outputFile);

        break;
      }
      case IOComponentEnum::FLOAT:
      {
        WriteCellsAsAscii(static_cast<float *>(buffer), outputFile);

        break;
      }
      case IOComponentEnum::DOUBLE:
      {
        WriteCellsAsAscii(static_cast<double *>(buffer), outputFile);

        break;
      }
      case IOComponentEnum::LDOUBLE:
      {
        WriteCellsAsAscii(static_cast<long double *>(buffer), outputFile);

        break;
      }
      default:
      {
        itkExceptionMacro("Unknown cell pixel component type" << std::endl);
      }
    }
  }
  else if (this->m_FileType == IOFileEnum::BINARY)
  {
    switch (this->m_CellComponentType)
    {
      case IOComponentEnum::UCHAR:
      {
        WriteCellsAsBinary<itk::uint32_t>(static_cast<unsigned char *>(buffer), outputFile);

        break;
      }
      case IOComponentEnum::CHAR:
      {
        WriteCellsAsBinary<itk::uint32_t>(static_cast<char *>(buffer), outputFile);

        break;
      }
      case IOComponentEnum::USHORT:
      {
        WriteCellsAsBinary<itk::uint32_t>(static_cast<unsigned short *>(buffer), outputFile);

        break;
      }
      case IOComponentEnum::SHORT:
      {
        WriteCellsAsBinary<itk::uint32_t>(static_cast<short *>(buffer), outputFile);

        break;
      }
      case IOComponentEnum::UINT:
      {
        WriteCellsAsBinary<itk::uint32_t>(static_cast<unsigned int *>(buffer), outputFile);

        break;
      }
      case IOComponentEnum::INT:
      {
        WriteCellsAsBinary<itk::uint32_t>(static_cast<int *>(buffer), outputFile);

        break;
      }
      case IOComponentEnum::ULONG:
      {
        WriteCellsAsBinary<itk::uint32_t>(static_cast<long *>(buffer), outputFile);

        break;
      }
      case IOComponentEnum::LONG:
      {
        WriteCellsAsBinary<itk::uint32_t>(static_cast<long *>(buffer), outputFile);

        break;
      }
      case IOComponentEnum::ULONGLONG:
      {
        WriteCellsAsBinary<itk::uint32_t>(static_cast<unsigned long long *>(buffer), outputFile);

        break;
      }
      case IOComponentEnum::LONGLONG:
      {
        WriteCellsAsBinary<itk::uint32_t>(static_cast<long long *>(buffer), outputFile);

        break;
      }
      case IOComponentEnum::FLOAT:
      {
        WriteCellsAsBinary<itk::uint32_t>(static_cast<float *>(buffer), outputFile);

        break;
      }
      case IOComponentEnum::DOUBLE:
      {
        WriteCellsAsBinary<itk::uint32_t>(static_cast<double *>(buffer), outputFile);

        break;
      }
      case IOComponentEnum::LDOUBLE:
      {
        WriteCellsAsBinary<itk::uint32_t>(static_cast<long double *>(buffer), outputFile);

        break;
      }
      default:
      {
        itkExceptionMacro("Unknown cell pixel component type" << std::endl);
      }
    }
  }

  outputFile.close();
}

void
OFFMeshIO::WritePointData(void * itkNotUsed(buffer))
{}

void
OFFMeshIO::WriteCellData(void * itkNotUsed(buffer))
{}

void
OFFMeshIO::Write()
{}

void
OFFMeshIO::PrintSelf(std::ostream & os, Indent indent) const
{
  Superclass::PrintSelf(os, indent);
}
} // namespace itk