/**
 * Orthanc - A Lightweight, RESTful DICOM Store
 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
 * Department, University Hospital 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 "PrecompiledHeadersServer.h"
#include "DatabaseWrapperBase.h"

#include <stdio.h>
#include <memory>

namespace Orthanc
{
  void DatabaseWrapperBase::SetGlobalProperty(GlobalProperty property,
                                              const std::string& value)
  {
    SQLite::Statement s(db_, SQLITE_FROM_HERE, "INSERT OR REPLACE INTO GlobalProperties VALUES(?, ?)");
    s.BindInt(0, property);
    s.BindString(1, value);
    s.Run();
  }

  bool DatabaseWrapperBase::LookupGlobalProperty(std::string& target,
                                                 GlobalProperty property)
  {
    SQLite::Statement s(db_, SQLITE_FROM_HERE, 
                        "SELECT value FROM GlobalProperties WHERE property=?");
    s.BindInt(0, property);

    if (!s.Step())
    {
      return false;
    }
    else
    {
      target = s.ColumnString(0);
      return true;
    }
  }

  int64_t DatabaseWrapperBase::CreateResource(const std::string& publicId,
                                              ResourceType type)
  {
    SQLite::Statement s(db_, SQLITE_FROM_HERE, "INSERT INTO Resources VALUES(NULL, ?, ?, NULL)");
    s.BindInt(0, type);
    s.BindString(1, publicId);
    s.Run();
    return db_.GetLastInsertRowId();
  }

  bool DatabaseWrapperBase::LookupResource(int64_t& id,
                                           ResourceType& type,
                                           const std::string& publicId)
  {
    SQLite::Statement s(db_, SQLITE_FROM_HERE, 
                        "SELECT internalId, resourceType FROM Resources WHERE publicId=?");
    s.BindString(0, publicId);

    if (!s.Step())
    {
      return false;
    }
    else
    {
      id = s.ColumnInt(0);
      type = static_cast<ResourceType>(s.ColumnInt(1));

      // Check whether there is a single resource with this public id
      assert(!s.Step());

      return true;
    }
  }

  ErrorCode DatabaseWrapperBase::LookupParent(bool& found,
                                              int64_t& parentId,
                                              int64_t resourceId)
  {
    SQLite::Statement s(db_, SQLITE_FROM_HERE, 
                        "SELECT parentId FROM Resources WHERE internalId=?");
    s.BindInt64(0, resourceId);

    if (!s.Step())
    {
      return ErrorCode_UnknownResource;
    }

    if (s.ColumnIsNull(0))
    {
      found = false;
    }
    else
    {
      found = true;
      parentId = s.ColumnInt(0);
    }

    return ErrorCode_Success;
  }

  bool DatabaseWrapperBase::GetPublicId(std::string& result,
                                        int64_t resourceId)
  {
    SQLite::Statement s(db_, SQLITE_FROM_HERE, 
                        "SELECT publicId FROM Resources WHERE internalId=?");
    s.BindInt64(0, resourceId);
    
    if (!s.Step())
    { 
      return false;
    }
    else
    {
      result = s.ColumnString(0);
      return true;
    }
  }


  ErrorCode DatabaseWrapperBase::GetResourceType(ResourceType& result,
                                                 int64_t resourceId)
  {
    SQLite::Statement s(db_, SQLITE_FROM_HERE, 
                        "SELECT resourceType FROM Resources WHERE internalId=?");
    s.BindInt64(0, resourceId);
    
    if (s.Step())
    {
      result = static_cast<ResourceType>(s.ColumnInt(0));
      return ErrorCode_Success;
    }
    else
    { 
      return ErrorCode_UnknownResource;
    }
  }


  void DatabaseWrapperBase::AttachChild(int64_t parent,
                                        int64_t child)
  {
    SQLite::Statement s(db_, SQLITE_FROM_HERE, "UPDATE Resources SET parentId = ? WHERE internalId = ?");
    s.BindInt64(0, parent);
    s.BindInt64(1, child);
    s.Run();
  }


  void DatabaseWrapperBase::SetMetadata(int64_t id,
                                        MetadataType type,
                                        const std::string& value)
  {
    SQLite::Statement s(db_, SQLITE_FROM_HERE, "INSERT OR REPLACE INTO Metadata VALUES(?, ?, ?)");
    s.BindInt64(0, id);
    s.BindInt(1, type);
    s.BindString(2, value);
    s.Run();
  }

  void DatabaseWrapperBase::DeleteMetadata(int64_t id,
                                           MetadataType type)
  {
    SQLite::Statement s(db_, SQLITE_FROM_HERE, "DELETE FROM Metadata WHERE id=? and type=?");
    s.BindInt64(0, id);
    s.BindInt(1, type);
    s.Run();
  }

  bool DatabaseWrapperBase::LookupMetadata(std::string& target,
                                           int64_t id,
                                           MetadataType type)
  {
    SQLite::Statement s(db_, SQLITE_FROM_HERE, 
                        "SELECT value FROM Metadata WHERE id=? AND type=?");
    s.BindInt64(0, id);
    s.BindInt(1, type);

    if (!s.Step())
    {
      return false;
    }
    else
    {
      target = s.ColumnString(0);
      return true;
    }
  }

  void DatabaseWrapperBase::ListAvailableMetadata(std::list<MetadataType>& target,
                                                  int64_t id)
  {
    target.clear();

    SQLite::Statement s(db_, SQLITE_FROM_HERE, "SELECT type FROM Metadata WHERE id=?");
    s.BindInt64(0, id);

    while (s.Step())
    {
      target.push_back(static_cast<MetadataType>(s.ColumnInt(0)));
    }
  }


  void DatabaseWrapperBase::AddAttachment(int64_t id,
                                          const FileInfo& attachment)
  {
    SQLite::Statement s(db_, SQLITE_FROM_HERE, "INSERT INTO AttachedFiles VALUES(?, ?, ?, ?, ?, ?, ?, ?)");
    s.BindInt64(0, id);
    s.BindInt(1, attachment.GetContentType());
    s.BindString(2, attachment.GetUuid());
    s.BindInt64(3, attachment.GetCompressedSize());
    s.BindInt64(4, attachment.GetUncompressedSize());
    s.BindInt(5, attachment.GetCompressionType());
    s.BindString(6, attachment.GetUncompressedMD5());
    s.BindString(7, attachment.GetCompressedMD5());
    s.Run();
  }


  void DatabaseWrapperBase::DeleteAttachment(int64_t id,
                                             FileContentType attachment)
  {
    SQLite::Statement s(db_, SQLITE_FROM_HERE, "DELETE FROM AttachedFiles WHERE id=? AND fileType=?");
    s.BindInt64(0, id);
    s.BindInt(1, attachment);
    s.Run();
  }



  void DatabaseWrapperBase::ListAvailableAttachments(std::list<FileContentType>& target,
                                                     int64_t id)
  {
    target.clear();

    SQLite::Statement s(db_, SQLITE_FROM_HERE, 
                        "SELECT fileType FROM AttachedFiles WHERE id=?");
    s.BindInt64(0, id);

    while (s.Step())
    {
      target.push_back(static_cast<FileContentType>(s.ColumnInt(0)));
    }
  }

  bool DatabaseWrapperBase::LookupAttachment(FileInfo& attachment,
                                             int64_t id,
                                             FileContentType contentType)
  {
    SQLite::Statement s(db_, SQLITE_FROM_HERE, 
                        "SELECT uuid, uncompressedSize, compressionType, compressedSize, uncompressedMD5, compressedMD5 FROM AttachedFiles WHERE id=? AND fileType=?");
    s.BindInt64(0, id);
    s.BindInt(1, contentType);

    if (!s.Step())
    {
      return false;
    }
    else
    {
      attachment = FileInfo(s.ColumnString(0),
                            contentType,
                            s.ColumnInt64(1),
                            s.ColumnString(4),
                            static_cast<CompressionType>(s.ColumnInt(2)),
                            s.ColumnInt64(3),
                            s.ColumnString(5));
      return true;
    }
  }


  void DatabaseWrapperBase::ClearMainDicomTags(int64_t id)
  {
    {
      SQLite::Statement s(db_, SQLITE_FROM_HERE, "DELETE FROM DicomIdentifiers WHERE id=?");
      s.BindInt64(0, id);
      s.Run();
    }

    {
      SQLite::Statement s(db_, SQLITE_FROM_HERE, "DELETE FROM MainDicomTags WHERE id=?");
      s.BindInt64(0, id);
      s.Run();
    }
  }


  void DatabaseWrapperBase::SetMainDicomTag(int64_t id,
                                            const DicomTag& tag,
                                            const std::string& value)
  {
    SQLite::Statement s(db_, SQLITE_FROM_HERE, "INSERT INTO MainDicomTags VALUES(?, ?, ?, ?)");
    s.BindInt64(0, id);
    s.BindInt(1, tag.GetGroup());
    s.BindInt(2, tag.GetElement());
    s.BindString(3, value);
    s.Run();
  }


  void DatabaseWrapperBase::SetIdentifierTag(int64_t id,
                                             const DicomTag& tag,
                                             const std::string& value)
  {
    SQLite::Statement s(db_, SQLITE_FROM_HERE, "INSERT INTO DicomIdentifiers VALUES(?, ?, ?, ?)");
    s.BindInt64(0, id);
    s.BindInt(1, tag.GetGroup());
    s.BindInt(2, tag.GetElement());
    s.BindString(3, value);
    s.Run();
  }


  void DatabaseWrapperBase::GetMainDicomTags(DicomMap& map,
                                             int64_t id)
  {
    map.Clear();

    SQLite::Statement s(db_, SQLITE_FROM_HERE, "SELECT * FROM MainDicomTags WHERE id=?");
    s.BindInt64(0, id);
    while (s.Step())
    {
      map.SetValue(s.ColumnInt(1),
                   s.ColumnInt(2),
                   s.ColumnString(3));
    }
  }



  void DatabaseWrapperBase::GetChildrenPublicId(std::list<std::string>& target,
                                                int64_t id)
  {
    SQLite::Statement s(db_, SQLITE_FROM_HERE, "SELECT a.publicId FROM Resources AS a, Resources AS b  "
                        "WHERE a.parentId = b.internalId AND b.internalId = ?");     
    s.BindInt64(0, id);

    target.clear();

    while (s.Step())
    {
      target.push_back(s.ColumnString(0));
    }
  }


  void DatabaseWrapperBase::GetChildrenInternalId(std::list<int64_t>& target,
                                                  int64_t id)
  {
    SQLite::Statement s(db_, SQLITE_FROM_HERE, "SELECT a.internalId FROM Resources AS a, Resources AS b  "
                        "WHERE a.parentId = b.internalId AND b.internalId = ?");     
    s.BindInt64(0, id);

    target.clear();

    while (s.Step())
    {
      target.push_back(s.ColumnInt64(0));
    }
  }


  void DatabaseWrapperBase::LogChange(int64_t internalId,
                                      const ServerIndexChange& change)
  {
    SQLite::Statement s(db_, SQLITE_FROM_HERE, "INSERT INTO Changes VALUES(NULL, ?, ?, ?, ?)");
    s.BindInt(0, change.GetChangeType());
    s.BindInt64(1, internalId);
    s.BindInt(2, change.GetResourceType());
    s.BindString(3, change.GetDate());
    s.Run();
  }


  ErrorCode DatabaseWrapperBase::GetChangesInternal(std::list<ServerIndexChange>& target,
                                                    bool& done,
                                                    SQLite::Statement& s,
                                                    uint32_t maxResults)
  {
    target.clear();

    while (target.size() < maxResults && s.Step())
    {
      int64_t seq = s.ColumnInt64(0);
      ChangeType changeType = static_cast<ChangeType>(s.ColumnInt(1));
      ResourceType resourceType = static_cast<ResourceType>(s.ColumnInt(3));
      const std::string& date = s.ColumnString(4);

      int64_t internalId = s.ColumnInt64(2);
      std::string publicId;
      if (!GetPublicId(publicId, internalId))
      {
        return ErrorCode_UnknownResource;
      }

      target.push_back(ServerIndexChange(seq, changeType, resourceType, publicId, date));
    }

    done = !(target.size() == maxResults && s.Step());
    return ErrorCode_Success;
  }


  ErrorCode DatabaseWrapperBase::GetChanges(std::list<ServerIndexChange>& target,
                                            bool& done,
                                            int64_t since,
                                            uint32_t maxResults)
  {
    SQLite::Statement s(db_, SQLITE_FROM_HERE, "SELECT * FROM Changes WHERE seq>? ORDER BY seq LIMIT ?");
    s.BindInt64(0, since);
    s.BindInt(1, maxResults + 1);
    return GetChangesInternal(target, done, s, maxResults);
  }

  ErrorCode DatabaseWrapperBase::GetLastChange(std::list<ServerIndexChange>& target)
  {
    bool done;  // Ignored
    SQLite::Statement s(db_, SQLITE_FROM_HERE, "SELECT * FROM Changes ORDER BY seq DESC LIMIT 1");
    return GetChangesInternal(target, done, s, 1);
  }


  void DatabaseWrapperBase::LogExportedResource(const ExportedResource& resource)
  {
    SQLite::Statement s(db_, SQLITE_FROM_HERE, 
                        "INSERT INTO ExportedResources VALUES(NULL, ?, ?, ?, ?, ?, ?, ?, ?)");

    s.BindInt(0, resource.GetResourceType());
    s.BindString(1, resource.GetPublicId());
    s.BindString(2, resource.GetModality());
    s.BindString(3, resource.GetPatientId());
    s.BindString(4, resource.GetStudyInstanceUid());
    s.BindString(5, resource.GetSeriesInstanceUid());
    s.BindString(6, resource.GetSopInstanceUid());
    s.BindString(7, resource.GetDate());
    s.Run();      
  }


  void DatabaseWrapperBase::GetExportedResourcesInternal(std::list<ExportedResource>& target,
                                                         bool& done,
                                                         SQLite::Statement& s,
                                                         uint32_t maxResults)
  {
    target.clear();

    while (target.size() < maxResults && s.Step())
    {
      int64_t seq = s.ColumnInt64(0);
      ResourceType resourceType = static_cast<ResourceType>(s.ColumnInt(1));
      std::string publicId = s.ColumnString(2);

      ExportedResource resource(seq, 
                                resourceType,
                                publicId,
                                s.ColumnString(3),  // modality
                                s.ColumnString(8),  // date
                                s.ColumnString(4),  // patient ID
                                s.ColumnString(5),  // study instance UID
                                s.ColumnString(6),  // series instance UID
                                s.ColumnString(7)); // sop instance UID

      target.push_back(resource);
    }

    done = !(target.size() == maxResults && s.Step());
  }


  void DatabaseWrapperBase::GetExportedResources(std::list<ExportedResource>& target,
                                                 bool& done,
                                                 int64_t since,
                                                 uint32_t maxResults)
  {
    SQLite::Statement s(db_, SQLITE_FROM_HERE, 
                        "SELECT * FROM ExportedResources WHERE seq>? ORDER BY seq LIMIT ?");
    s.BindInt64(0, since);
    s.BindInt(1, maxResults + 1);
    GetExportedResourcesInternal(target, done, s, maxResults);
  }

    
  void DatabaseWrapperBase::GetLastExportedResource(std::list<ExportedResource>& target)
  {
    bool done;  // Ignored
    SQLite::Statement s(db_, SQLITE_FROM_HERE, 
                        "SELECT * FROM ExportedResources ORDER BY seq DESC LIMIT 1");
    GetExportedResourcesInternal(target, done, s, 1);
  }


    
  uint64_t DatabaseWrapperBase::GetTotalCompressedSize()
  {
    SQLite::Statement s(db_, SQLITE_FROM_HERE, "SELECT SUM(compressedSize) FROM AttachedFiles");
    s.Run();
    return static_cast<uint64_t>(s.ColumnInt64(0));
  }

    
  uint64_t DatabaseWrapperBase::GetTotalUncompressedSize()
  {
    SQLite::Statement s(db_, SQLITE_FROM_HERE, "SELECT SUM(uncompressedSize) FROM AttachedFiles");
    s.Run();
    return static_cast<uint64_t>(s.ColumnInt64(0));
  }

  void DatabaseWrapperBase::GetAllInternalIds(std::list<int64_t>& target,
                                              ResourceType resourceType)
  {
    SQLite::Statement s(db_, SQLITE_FROM_HERE, "SELECT internalId FROM Resources WHERE resourceType=?");
    s.BindInt(0, resourceType);

    target.clear();
    while (s.Step())
    {
      target.push_back(s.ColumnInt64(0));
    }
  }


  void DatabaseWrapperBase::GetAllPublicIds(std::list<std::string>& target,
                                            ResourceType resourceType)
  {
    SQLite::Statement s(db_, SQLITE_FROM_HERE, "SELECT publicId FROM Resources WHERE resourceType=?");
    s.BindInt(0, resourceType);

    target.clear();
    while (s.Step())
    {
      target.push_back(s.ColumnString(0));
    }
  }

  void DatabaseWrapperBase::GetAllPublicIds(std::list<std::string>& target,
                                            ResourceType resourceType,
                                            size_t since,
                                            size_t limit)
  {
    if (limit == 0)
    {
      target.clear();
      return;
    }

    SQLite::Statement s(db_, SQLITE_FROM_HERE, "SELECT publicId FROM Resources WHERE resourceType=? LIMIT ? OFFSET ?");
    s.BindInt(0, resourceType);
    s.BindInt64(1, limit);
    s.BindInt64(2, since);

    target.clear();
    while (s.Step())
    {
      target.push_back(s.ColumnString(0));
    }
  }


  uint64_t DatabaseWrapperBase::GetResourceCount(ResourceType resourceType)
  {
    SQLite::Statement s(db_, SQLITE_FROM_HERE, 
                        "SELECT COUNT(*) FROM Resources WHERE resourceType=?");
    s.BindInt(0, resourceType);
    
    if (!s.Step())
    {
      return 0;
    }
    else
    {
      int64_t c = s.ColumnInt(0);
      assert(!s.Step());
      return c;
    }
  }


  bool DatabaseWrapperBase::SelectPatientToRecycle(int64_t& internalId)
  {
    SQLite::Statement s(db_, SQLITE_FROM_HERE,
                        "SELECT patientId FROM PatientRecyclingOrder ORDER BY seq ASC LIMIT 1");
   
    if (!s.Step())
    {
      // No patient remaining or all the patients are protected
      return false;
    }
    else
    {
      internalId = s.ColumnInt(0);
      return true;
    }    
  }

  bool DatabaseWrapperBase::SelectPatientToRecycle(int64_t& internalId,
                                                   int64_t patientIdToAvoid)
  {
    SQLite::Statement s(db_, SQLITE_FROM_HERE,
                        "SELECT patientId FROM PatientRecyclingOrder "
                        "WHERE patientId != ? ORDER BY seq ASC LIMIT 1");
    s.BindInt64(0, patientIdToAvoid);

    if (!s.Step())
    {
      // No patient remaining or all the patients are protected
      return false;
    }
    else
    {
      internalId = s.ColumnInt(0);
      return true;
    }   
  }

  bool DatabaseWrapperBase::IsProtectedPatient(int64_t internalId)
  {
    SQLite::Statement s(db_, SQLITE_FROM_HERE,
                        "SELECT * FROM PatientRecyclingOrder WHERE patientId = ?");
    s.BindInt64(0, internalId);
    return !s.Step();
  }

  void DatabaseWrapperBase::SetProtectedPatient(int64_t internalId, 
                                                bool isProtected)
  {
    if (isProtected)
    {
      SQLite::Statement s(db_, SQLITE_FROM_HERE, "DELETE FROM PatientRecyclingOrder WHERE patientId=?");
      s.BindInt64(0, internalId);
      s.Run();
    }
    else if (IsProtectedPatient(internalId))
    {
      SQLite::Statement s(db_, SQLITE_FROM_HERE, "INSERT INTO PatientRecyclingOrder VALUES(NULL, ?)");
      s.BindInt64(0, internalId);
      s.Run();
    }
    else
    {
      // Nothing to do: The patient is already unprotected
    }
  }



  bool DatabaseWrapperBase::IsExistingResource(int64_t internalId)
  {
    SQLite::Statement s(db_, SQLITE_FROM_HERE, 
                        "SELECT * FROM Resources WHERE internalId=?");
    s.BindInt64(0, internalId);
    return s.Step();
  }



  void DatabaseWrapperBase::LookupIdentifier(std::list<int64_t>& target,
                                             ResourceType level,
                                             const DicomTag& tag,
                                             IdentifierConstraintType type,
                                             const std::string& value)
  {
    static const char* COMMON = ("SELECT d.id FROM DicomIdentifiers AS d, Resources AS r WHERE "
                                 "d.id = r.internalId AND r.resourceType=? AND "
                                 "d.tagGroup=? AND d.tagElement=? AND ");

    std::auto_ptr<SQLite::Statement> s;

    switch (type)
    {
      case IdentifierConstraintType_GreaterOrEqual:
        s.reset(new SQLite::Statement(db_, std::string(COMMON) + "d.value>=?"));
        break;

      case IdentifierConstraintType_SmallerOrEqual:
        s.reset(new SQLite::Statement(db_, std::string(COMMON) + "d.value<=?"));
        break;

      case IdentifierConstraintType_Wildcard:
        s.reset(new SQLite::Statement(db_, std::string(COMMON) + "d.value GLOB ?"));
        break;

      case IdentifierConstraintType_Equal:
      default:
        s.reset(new SQLite::Statement(db_, std::string(COMMON) + "d.value=?"));
        break;
    }

    assert(s.get() != NULL);

    s->BindInt(0, level);
    s->BindInt(1, tag.GetGroup());
    s->BindInt(2, tag.GetElement());
    s->BindString(3, value);

    target.clear();

    while (s->Step())
    {
      target.push_back(s->ColumnInt64(0));
    }    
  }
}