/*
 * Copyright (C) 2005-2019 Centre National d'Etudes Spatiales (CNES)
 *
 * This file is part of Orfeo Toolbox
 *
 *     https://www.orfeo-toolbox.org/
 *
 * 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
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * 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.
 */


#ifndef otbVectorDataFileReader_hxx
#define otbVectorDataFileReader_hxx

#include <fstream>

#include "otbMacro.h"
#include "otbSystem.h"
#include "otbVectorDataIOFactory.h"
#include "otbVectorDataFileReader.h"
#include "itksys/SystemTools.hxx"
#include "otbVectorDataAdapter.h"
#include "otbVectorData.h"

namespace otb
{
/**
 * Constructor
 */
template <class TOutputVectorData>
VectorDataFileReader<TOutputVectorData>::VectorDataFileReader() : m_VectorDataIO(nullptr), m_UserSpecifiedVectorDataIO(false), m_FileName("")
{
}

/**
 * Destructor
 */
template <class TOutputVectorData>
VectorDataFileReader<TOutputVectorData>::~VectorDataFileReader()
{
}

/** Test whether the given filename exist and it is readable,
     this is intended to be called before attempting to use
     VectorDataIO classes for actually reading the file. If the file
     doesn't exist or it is not readable, and exception with an
     appropriate message will be thrown. */
template <class TOutputVectorData>
void VectorDataFileReader<TOutputVectorData>::TestFileExistenceAndReadability()
{
  // Test if the file exists.
  if (!itksys::SystemTools::FileExists(this->m_FileName))
  {
    VectorDataFileReaderException e(__FILE__, __LINE__);
    std::ostringstream            msg;
    msg << "The file doesn't exist. " << std::endl << "Filename = " << this->m_FileName << std::endl;
    e.SetDescription(msg.str());
    throw e;
    return;
  }

  // Test if the file can be open for reading access.
  // Only if m_FileName speciy a filename (not a dirname)
  // FIXME shapefile should be able to open a directory and load the
  // individual shapefiles as layers
  if (itksys::SystemTools::FileExists(this->m_FileName, true) == true)
  {
    std::ifstream readTester;
    readTester.open(this->m_FileName);
    if (readTester.fail())
    {
      readTester.close();
      std::ostringstream msg;
      msg << "The file couldn't be opened for reading. " << std::endl << "Filename: " << this->m_FileName << std::endl;
      VectorDataFileReaderException e(__FILE__, __LINE__, msg.str(), ITK_LOCATION);
      throw e;
      return;
    }
    readTester.close();
  }
}

template <class TOutputVectorData>
void VectorDataFileReader<TOutputVectorData>::SetVectorDataIO(VectorDataIOBaseType* vectorDataIO)
{
  itkDebugMacro("setting VectorDataIO to " << vectorDataIO);
  if (this->m_VectorDataIO != vectorDataIO)
  {
    this->m_VectorDataIO = vectorDataIO;
    this->Modified();
  }
  m_UserSpecifiedVectorDataIO = true;
}

template <class TOutputVectorData>
void VectorDataFileReader<TOutputVectorData>::GenerateOutputInformation(void)
{
  typename TOutputVectorData::Pointer output = this->GetOutput();

  itkDebugMacro(<< "Reading file for GenerateOutputInformation()" << m_FileName);

  // Check to see if we can read the file given the name or prefix
  //
  if (m_FileName == "")
  {
    throw VectorDataFileReaderException(__FILE__, __LINE__, "FileName must be specified", ITK_LOCATION);
  }

  // Test if the file exist and if it can be open.
  // and exception will be thrown otherwise.
  //
  try
  {
    m_ExceptionMessage = "";
    this->TestFileExistenceAndReadability();
  }
  catch (itk::ExceptionObject& err)
  {
    m_ExceptionMessage = err.GetDescription();
  }

  if (m_UserSpecifiedVectorDataIO == false) // try creating via factory
  {
    m_VectorDataIO = VectorDataIOFactory::CreateVectorDataIO(m_FileName.c_str(), VectorDataIOFactory::ReadMode);
  }

  if (m_VectorDataIO.IsNull())
  {
    std::ostringstream msg;
    msg << " Could not create IO object for file " << m_FileName << std::endl;
    if (m_ExceptionMessage.size())
    {
      msg << m_ExceptionMessage;
    }
    else
    {
      msg << "  Tried to create one of the following:" << std::endl;
      std::list<itk::LightObject::Pointer> allobjects = itk::ObjectFactoryBase::CreateAllInstance("otbVectorDataIOBase");
      for (std::list<itk::LightObject::Pointer>::iterator i = allobjects.begin(); i != allobjects.end(); ++i)
      {
        VectorDataIOBase* io = dynamic_cast<VectorDataIOBase*>(i->GetPointer());
        msg << "    " << io->GetNameOfClass() << std::endl;
      }
      msg << "  You probably failed to set a file suffix, or" << std::endl;
      msg << "    set the suffix to an unsupported type." << std::endl;
    }
    VectorDataFileReaderException e(__FILE__, __LINE__, msg.str(), ITK_LOCATION);
    throw e;
    return;
  }

  m_VectorDataIO->SetFileName(m_FileName);

  // Copy MetaDataDictionary from instantiated reader to output VectorData.
  output->SetMetaDataDictionary(m_VectorDataIO->GetMetaDataDictionary());
  this->SetMetaDataDictionary(m_VectorDataIO->GetMetaDataDictionary());
}

template <class TOutputVectorData>
void VectorDataFileReader<TOutputVectorData>::GenerateData()
{

  typename TOutputVectorData::Pointer output = this->GetOutput();

  itkDebugMacro(<< "VectorDataFileReader::GenerateData() \n");

  // Test if the file exist and if it can be open.
  // and exception will be thrown otherwise.
  try
  {
    m_ExceptionMessage = "";
    this->TestFileExistenceAndReadability();
  }
  catch (itk::ExceptionObject& err)
  {
    m_ExceptionMessage = err.GetDescription();
  }

  m_VectorDataIO->SetFileName(m_FileName);

  // Tell the VectorDataIO to read the file
  //

  typedef VectorDataAdapter<VectorData<double, 2>, TOutputVectorData> AdapterType;
  typename AdapterType::InputVectorDataType::Pointer input = AdapterType::InputVectorDataType::New();

  m_VectorDataIO->Read(input);

  typename AdapterType::Pointer adapter = AdapterType::New();
  adapter->SetInput(input);
  adapter->GraftOutput(output);
  adapter->Update();
  this->GraftOutput(adapter->GetOutput());

  return;
}

template <class TOutputVectorData>
void VectorDataFileReader<TOutputVectorData>::PrintSelf(std::ostream& os, itk::Indent indent) const
{
  Superclass::PrintSelf(os, indent);

  if (m_VectorDataIO)
  {
    os << indent << "VectorDataIO: \n";
    m_VectorDataIO->Print(os, indent.GetNextIndent());
  }
  else
  {
    os << indent << "m_VectorDataIO: (null)"
       << "\n";
  }

  os << indent << "UserSpecifiedVectorDataIO flag: " << m_UserSpecifiedVectorDataIO << "\n";
  os << indent << "m_FileName: " << m_FileName << "\n";
}

} // namespace otb

#endif