/**
 * Orthanc - A Lightweight, RESTful DICOM Store
 * Copyright (C) 2012-2013 Medical Physics Department, CHU of Liege,
 * 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 "RadiotherapyRestApi.h"

#include "ServerToolbox.h"

#define RETRIEVE_CONTEXT(call)                          \
  OrthancRestApi& contextApi =                          \
    dynamic_cast<OrthancRestApi&>(call.GetContext());   \
  ServerContext& context = contextApi.GetContext()


#define REFERENCED_STUDY_SEQUENCE "0008,1110"
#define REFERENCED_SOP_INSTANCE_UID "0008,1155"
#define FRAME_OF_REFERENCE_UID "0020,0052"
#define REFERENCED_FRAME_OF_REFERENCE_SEQUENCE "3006,0010"

namespace Orthanc
{
  static bool CheckSeriesModality(Json::Value& study,
                                  Json::Value& series,
                                  Json::Value& content,
                                  ServerContext& context,
                                  const std::string& seriesId,
                                  const std::string& modality)
  {
    if (!context.GetIndex().LookupResource(series, seriesId, ResourceType_Series))
    {
      return false;
    }

    // Retrieve the parent study
    std::string studyId = series["ParentStudy"].asString();
    if (!context.GetIndex().LookupResource(study, studyId, ResourceType_Study))
    {
      return false;
    }

    // Check the modality and that there is a single instance inside the series
    if (!series["MainDicomTags"].isMember("Modality") ||
        series["MainDicomTags"]["Modality"].asString() != modality ||
        series["Instances"].size() != 1)
    {
      return false;
    }

    // Retrieve the instance data
    std::string instanceId = series["Instances"][0].asString();

    Json::Value info;
    context.ReadJson(content, instanceId);

    return true;
  }


  static bool GetRtStructuresInfo(Json::Value& study,
                                  Json::Value& series,
                                  Json::Value& content,
                                  std::string& frameOfReference,
                                  ServerContext& context,
                                  const std::string& seriesId)
  {
    if (!CheckSeriesModality(study, series, content, context, seriesId, "RTSTRUCT"))
    {
      return false;
    }

    // Check that the "ReferencedStudySequence" is the same as the parent study.
    if (!content.isMember(REFERENCED_STUDY_SEQUENCE) ||
        content[REFERENCED_STUDY_SEQUENCE]["Value"].size() != 1 ||
        !content[REFERENCED_STUDY_SEQUENCE]["Value"][0].isMember(REFERENCED_SOP_INSTANCE_UID) ||
        content[REFERENCED_STUDY_SEQUENCE]["Value"][0][REFERENCED_SOP_INSTANCE_UID]["Value"].asString() != 
        study["MainDicomTags"]["StudyInstanceUID"].asString())
    {
      return false;
    }

    // Lookup for the frame of reference. Orthanc does not support
    // RTSTRUCT with multiple frames of reference.
    if (!content.isMember(REFERENCED_FRAME_OF_REFERENCE_SEQUENCE) ||
        content[REFERENCED_FRAME_OF_REFERENCE_SEQUENCE]["Value"].size() != 1 ||
        !content[REFERENCED_FRAME_OF_REFERENCE_SEQUENCE]["Value"][0].isMember(FRAME_OF_REFERENCE_UID))
    {
      return false;
    }

    frameOfReference = content[REFERENCED_FRAME_OF_REFERENCE_SEQUENCE]["Value"][0][FRAME_OF_REFERENCE_UID]["Value"].asString();

    return true;
  }


  static void GetRtStructuresInfo(RestApi::GetCall& call)
  {
    RETRIEVE_CONTEXT(call);

    Json::Value study, series, content;
    std::string frameOfReference;
    if (GetRtStructuresInfo(study, series, content, frameOfReference, context, call.GetUriComponent("id", "")))
    {
      Json::Value result;

      result["Study"] = study["ID"];


      // Lookup the series with the same frame of reference inside this study
      result["RelatedSeries"] = Json::arrayValue;

      for (Json::Value::ArrayIndex i = 0; i < study["Series"].size(); i++)
      {
        Json::Value otherSeries;
        if (context.GetIndex().LookupResource(otherSeries, study["Series"][i].asString(), ResourceType_Series) &&
            otherSeries["Instances"].size() > 0)
        {
          Json::Value info;
          context.ReadJson(info, otherSeries["Instances"][0].asString());

          if (info.isMember(FRAME_OF_REFERENCE_UID))
          {
            result["RelatedSeries"].append(study["Series"][i].asString());
          }
        }
      }

      call.GetOutput().AnswerJson(result);
    }
  }


  RadiotherapyRestApi::RadiotherapyRestApi(ServerContext& context) : OrthancRestApi(context)
  {
    Register("/series/{id}/rt-structures", GetRtStructuresInfo);
  }
}


//  curl http://localhost:8042/series/0b9e2bb2-605a59aa-f27c0260-9cc4faf6-9d8bf457/rt-structures
//  curl http://localhost:8042/series/ef041e6b-c855e775-f7e0f7fe-dc3c17dc-533cb8c5/rt-structures