/**
 * Orthanc - A Lightweight, RESTful DICOM Store
 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
 * Department, University Hospital of Liege, Belgium
 * Copyright (C) 2017-2018 Osimis S.A., Belgium
 *
 * This program is free software: you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * In addition, as a special exception, the copyright holders of this
 * program give permission to link the code of its release with the
 * OpenSSL project's "OpenSSL" library (or with modified versions of it
 * that use the same license as the "OpenSSL" library), and distribute
 * the linked executables. You must obey the GNU General Public License
 * in all respects for all of the code used other than "OpenSSL". If you
 * modify file(s) with this exception, you may extend this exception to
 * your version of the file(s), but you are not obligated to do so. If
 * you do not wish to do so, delete this exception statement from your
 * version. If you delete this exception statement from all source files
 * in the program, then also delete it here.
 * 
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 **/


#include "PrecompiledHeadersServer.h"
#include "DicomInstanceToStore.h"

#include "../Core/DicomParsing/FromDcmtkBridge.h"
#include "../Core/Logging.h"

#include <dcmtk/dcmdata/dcfilefo.h>
#include <dcmtk/dcmdata/dcdeftag.h>


namespace Orthanc
{
  void DicomInstanceToStore::AddMetadata(ResourceType level,
                                         MetadataType metadata,
                                         const std::string& value)
  {
    metadata_[std::make_pair(level, metadata)] = value;
  }


  void DicomInstanceToStore::ComputeMissingInformation()
  {
    if (buffer_.HasContent() &&
        summary_.HasContent() &&
        json_.HasContent())
    {
      // Fine, everything is available
      return; 
    }
    
    if (!buffer_.HasContent())
    {
      if (!parsed_.HasContent())
      {
        if (!summary_.HasContent())
        {
          throw OrthancException(ErrorCode_NotImplemented);
        }
        else
        {
          parsed_.TakeOwnership(new ParsedDicomFile(summary_.GetConstContent()));
        }                                
      }

      // Serialize the parsed DICOM file
      buffer_.Allocate();
      if (!FromDcmtkBridge::SaveToMemoryBuffer(buffer_.GetContent(), 
                                               *parsed_.GetContent().GetDcmtkObject().getDataset()))
      {
        LOG(ERROR) << "Unable to serialize a DICOM file to a memory buffer";
        throw OrthancException(ErrorCode_InternalError);
      }
    }

    if (summary_.HasContent() &&
        json_.HasContent())
    {
      return;
    }

    // At this point, we know that the DICOM file is available as a
    // memory buffer, but that its summary or its JSON version is
    // missing

    if (!parsed_.HasContent())
    {
      parsed_.TakeOwnership(new ParsedDicomFile(buffer_.GetConstContent()));
    }

    // At this point, we have parsed the DICOM file
    
    if (!summary_.HasContent())
    {
      summary_.Allocate();
      FromDcmtkBridge::ExtractDicomSummary(summary_.GetContent(), 
                                           *parsed_.GetContent().GetDcmtkObject().getDataset());
    }
    
    if (!json_.HasContent())
    {
      json_.Allocate();

      std::set<DicomTag> ignoreTagLength;
      FromDcmtkBridge::ExtractDicomAsJson(json_.GetContent(), 
                                          *parsed_.GetContent().GetDcmtkObject().getDataset(),
                                          ignoreTagLength);
    }
  }



  const char* DicomInstanceToStore::GetBufferData()
  {
    ComputeMissingInformation();
    
    if (!buffer_.HasContent())
    {
      throw OrthancException(ErrorCode_InternalError);
    }

    if (buffer_.GetConstContent().size() == 0)
    {
      return NULL;
    }
    else
    {
      return buffer_.GetConstContent().c_str();
    }
  }


  size_t DicomInstanceToStore::GetBufferSize()
  {
    ComputeMissingInformation();
    
    if (!buffer_.HasContent())
    {
      throw OrthancException(ErrorCode_InternalError);
    }

    return buffer_.GetConstContent().size();
  }


  const DicomMap& DicomInstanceToStore::GetSummary()
  {
    ComputeMissingInformation();
    
    if (!summary_.HasContent())
    {
      throw OrthancException(ErrorCode_InternalError);
    }

    return summary_.GetConstContent();
  }

    
  const Json::Value& DicomInstanceToStore::GetJson()
  {
    ComputeMissingInformation();
    
    if (!json_.HasContent())
    {
      throw OrthancException(ErrorCode_InternalError);
    }

    return json_.GetConstContent();
  }


  bool DicomInstanceToStore::LookupTransferSyntax(std::string& result)
  {
    ComputeMissingInformation();

    DicomMap header;
    if (DicomMap::ParseDicomMetaInformation(header, GetBufferData(), GetBufferSize()))
    {
      const DicomValue* value = header.TestAndGetValue(DICOM_TAG_TRANSFER_SYNTAX_UID);
      if (value != NULL &&
          !value->IsBinary() &&
          !value->IsNull())
      {
        result = Toolbox::StripSpaces(value->GetContent());
        return true;
      }
    }

    return false;
  }
}
