/**
 * Orthanc - A Lightweight, RESTful DICOM Store
 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
 * Department, University Hospital of Liege, Belgium
 * Copyright (C) 2017-2020 Osimis S.A., Belgium
 *
 * This program is free software: you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation, either version 3 of
 * the License, or (at your option) any later version.
 *
 * 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this program. If not, see
 * <http://www.gnu.org/licenses/>.
 **/




/*=========================================================================

  This file is based on portions of the following project:

  Program: DCMTK 3.6.0
  Module:  http://dicom.offis.de/dcmtk.php.en

  Copyright (C) 1994-2011, OFFIS e.V.
  All rights reserved.

  This software and supporting documentation were developed by

  OFFIS e.V.
  R&D Division Health
  Escherweg 2
  26121 Oldenburg, Germany

  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions
  are met:

  - Redistributions of source code must retain the above copyright
  notice, this list of conditions and the following disclaimer.

  - Redistributions in binary form must reproduce the above copyright
  notice, this list of conditions and the following disclaimer in the
  documentation and/or other materials provided with the distribution.

  - Neither the name of OFFIS nor the names of its contributors may be
  used to endorse or promote products derived from this software
  without specific prior written permission.

  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

  =========================================================================*/


#include "../../PrecompiledHeaders.h"
#include <dcmtk/dcmnet/diutil.h>
#include <dcmtk/dcmdata/dcdeftag.h>
#include "GetScp.h"

#include <memory>

#include "../../DicomParsing/FromDcmtkBridge.h"
#include "../../DicomParsing/ToDcmtkBridge.h"
#include "../../Logging.h"
#include "../../OrthancException.h"

#include <boost/lexical_cast.hpp>


namespace Orthanc
{
  namespace
  {
    struct GetScpData
    {
      //  Handle returns void.
      IGetRequestHandler* handler_;
      DcmDataset* lastRequest_;
      T_ASC_Association * assoc_;

      std::string remoteIp_;
      std::string remoteAet_;
      std::string calledAet_;
      int timeout_;
      bool canceled_;

      GetScpData() :
        handler_(NULL),
        lastRequest_(NULL),
        assoc_(NULL),
        timeout_(0),
        canceled_(false)
      {
      };
    };
      
    static DcmDataset *BuildFailedInstanceList(const std::string& failedUIDs)
    {
      if (failedUIDs.empty())
      {
        return NULL;
      }
      else
      {
        std::unique_ptr<DcmDataset> rspIds(new DcmDataset());
        
        if (!DU_putStringDOElement(rspIds.get(), DCM_FailedSOPInstanceUIDList, failedUIDs.c_str()))
        {
          throw OrthancException(ErrorCode_InternalError,
                                 "getSCP: failed to build DCM_FailedSOPInstanceUIDList");
        }

        return rspIds.release();
      }
    }


    static void FillResponse(T_DIMSE_C_GetRSP& response,
                             DcmDataset** failedIdentifiers,
                             const IGetRequestHandler& handler)
    {
      response.DimseStatus = STATUS_Success;

      size_t processedCount = (handler.GetCompletedCount() +
                               handler.GetFailedCount() +
                               handler.GetWarningCount());

      if (processedCount > handler.GetSubOperationCount())
      {
        throw OrthancException(ErrorCode_InternalError);
      }

      response.NumberOfRemainingSubOperations = (handler.GetSubOperationCount() - processedCount);
      response.NumberOfCompletedSubOperations = handler.GetCompletedCount();
      response.NumberOfFailedSubOperations = handler.GetFailedCount();
      response.NumberOfWarningSubOperations = handler.GetWarningCount();

      // http://dicom.nema.org/medical/dicom/current/output/chtml/part04/sect_C.4.3.3.html
      
      if (handler.GetFailedCount() > 0 ||
          handler.GetWarningCount() > 0) 
      {
        /**
         * "Warning if one or more sub-operations were successfully
         * completed and one or more sub-operations were unsuccessful
         * or had a status of warning. Warning if all sub-operations
         * had a status of Warning"
         **/
        response.DimseStatus = STATUS_GET_Warning_SubOperationsCompleteOneOrMoreFailures;
      }

      if (handler.GetFailedCount() > 0 &&
          handler.GetFailedCount() == handler.GetSubOperationCount())
      {
        /**
         * "Failure or Refused if all sub-operations were
         * unsuccessful." => We choose to generate a "Refused - Out
         * of Resources - Unable to perform suboperations" status.
         */
        response.DimseStatus = STATUS_GET_Refused_OutOfResourcesSubOperations;
      }
            
      *failedIdentifiers = BuildFailedInstanceList(handler.GetFailedUids());
    }
    

    static void GetScpCallback(
      /* in */ 
      void *callbackData,  
      OFBool cancelled, 
      T_DIMSE_C_GetRQ *request, 
      DcmDataset *requestIdentifiers, 
      int responseCount,
      /* out */
      T_DIMSE_C_GetRSP *response,
      DcmDataset **responseIdentifiers,
      DcmDataset **statusDetail)
    {
      assert(response != NULL);
      assert(responseIdentifiers != NULL);
      assert(requestIdentifiers != NULL);
      
      bzero(response, sizeof(T_DIMSE_C_GetRSP));
      *statusDetail = NULL;
      *responseIdentifiers = NULL;   

      GetScpData& data = *reinterpret_cast<GetScpData*>(callbackData);
      if (data.lastRequest_ == NULL)
      {
        {
          std::stringstream s;  // DcmObject::PrintHelper cannot be used with VS2008
          requestIdentifiers->print(s);
          CLOG(TRACE, DICOM) << "Received C-GET Request:" << std::endl << s.str();
        }

        DicomMap input;
        std::set<DicomTag> ignoreTagLength;
        FromDcmtkBridge::ExtractDicomSummary(input, *requestIdentifiers, 0 /* don't truncate tags */, ignoreTagLength);

        try
        {
          if (!data.handler_->Handle(
                input, data.remoteIp_, data.remoteAet_, data.calledAet_,
                data.timeout_ < 0 ? 0 : static_cast<uint32_t>(data.timeout_)))
          {
            response->DimseStatus = STATUS_GET_Failed_UnableToProcess;
            return;
          }
        }
        catch (OrthancException& e)
        {
          // Internal error!
          CLOG(ERROR, DICOM) << "IGetRequestHandler Failed: " << e.What();
          response->DimseStatus = STATUS_GET_Failed_UnableToProcess;
          return;
        }

        data.lastRequest_ = requestIdentifiers;
      }
      else if (data.lastRequest_ != requestIdentifiers)
      {
        // Internal error!
        CLOG(ERROR, DICOM) << "IGetRequestHandler Failed: Internal error lastRequestIdentifier";
        response->DimseStatus = STATUS_GET_Failed_UnableToProcess;
        return;
      }

      if (data.canceled_)
      {
        CLOG(ERROR, DICOM) << "IGetRequestHandler Failed: Cannot pursue a request that was canceled by the SCU";
        response->DimseStatus = STATUS_GET_Failed_UnableToProcess;
        return;
      }
      
      if (data.handler_->GetSubOperationCount() ==
          data.handler_->GetCompletedCount() +
          data.handler_->GetFailedCount() +
          data.handler_->GetWarningCount())
      {
        // We're all done
        FillResponse(*response, responseIdentifiers, *data.handler_);
      }
      else
      {
        bool isContinue;
        
        try
        {
          isContinue = data.handler_->DoNext(data.assoc_);
        }
        catch (OrthancException& e)
        {
          // Internal error!
          CLOG(ERROR, DICOM) << "IGetRequestHandler Failed: " << e.What();
          FillResponse(*response, responseIdentifiers, *data.handler_);

          // Fix the status code that is computed by "FillResponse()"
          response->DimseStatus = STATUS_GET_Failed_UnableToProcess;
          return;
        }

        FillResponse(*response, responseIdentifiers, *data.handler_);

        if (isContinue)
        {
          response->DimseStatus = STATUS_Pending;
        }
        else
        {
          response->DimseStatus = STATUS_GET_Cancel_SubOperationsTerminatedDueToCancelIndication;
          data.canceled_ = true;
        }
      }
    }
  }

  OFCondition Internals::getScp(T_ASC_Association * assoc,
                                T_DIMSE_Message * msg, 
                                T_ASC_PresentationContextID presID,
                                IGetRequestHandler& handler,
                                const std::string& remoteIp,
                                const std::string& remoteAet,
                                const std::string& calledAet,
                                int timeout)
  {
    GetScpData data;
    data.lastRequest_ = NULL;
    data.handler_ = &handler;
    data.assoc_ = assoc;
    data.remoteIp_ = remoteIp;
    data.remoteAet_ = remoteAet;
    data.calledAet_ = calledAet;
    data.timeout_ = timeout;

    OFCondition cond = DIMSE_getProvider(assoc, presID, &msg->msg.CGetRQ, 
                                         GetScpCallback, &data,
                                         /*opt_blockMode*/ (timeout ? DIMSE_NONBLOCKING : DIMSE_BLOCKING),
                                         /*opt_dimse_timeout*/ timeout);
    
    // if some error occured, dump corresponding information and remove the outfile if necessary
    if (cond.bad())
    {
      OFString temp_str;
      CLOG(ERROR, DICOM) << "Get SCP Failed: " << cond.text();
    }

    return cond;
  }
}