/*=========================================================================
 *
 *  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.
 *
 *=========================================================================*/

#ifndef itkDOMTestObjectDOMWriter_h
#define itkDOMTestObjectDOMWriter_h

#include "itkDOMWriter.h"
#include "itkDOMTestObject.h"
#include "itkFileTools.h"

namespace itk
{

class DOMTestObjectDOMWriter : public DOMWriter<DOMTestObject>
{
public:
  ITK_DISALLOW_COPY_AND_MOVE(DOMTestObjectDOMWriter);

  /** Standard class type aliases. */
  using Self = DOMTestObjectDOMWriter;
  using Superclass = DOMWriter<DOMTestObject>;
  using Pointer = SmartPointer<Self>;
  using ConstPointer = SmartPointer<const Self>;

  /** Method for creation through the object factory. */
  itkNewMacro(Self);

  /** \see LightObject::GetNameOfClass() */
  itkOverrideGetNameOfClassMacro(DOMTestObjectDOMWriter);

protected:
  DOMTestObjectDOMWriter() = default;

  /**
   * This function is called automatically when update functions are performed.
   * It should fill the contents of the intermediate DOM object by pulling information from the input object.
   */
  void
  GenerateData(DOMNodeType * outputdom, const void *) const override;
};

inline void
DOMTestObjectDOMWriter::GenerateData(DOMNodeType * outputdom, const void *) const
{
  const InputType * input = this->GetInput();

  std::ofstream ofs;
  FancyString   fn;

  outputdom->SetName("DOMTestObject");

  // write child foo
  fn = input->GetFooFileName();
  DOMNodePointer foo = DOMNodeType::New();
  foo->SetName("foo");
  foo->SetAttribute("fname", fn);
  outputdom->AddChild(foo);
  // create the output file if it does not exist
  FileTools::CreateFile(fn);
  // write the foo value to file
  ofs.open(fn.ToString().c_str());
  if (!ofs.is_open())
  {
    itkExceptionMacro("cannot write foo file");
  }
  ofs << input->GetFooValue();
  ofs.close();
}

} // namespace itk

#endif // itkDOMTestObjectDOMWriter_h