/**
 * Orthanc - A Lightweight, RESTful DICOM Store
 * Copyright (C) 2012-2014 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/>.
 **/


#pragma once

#include "OrthancException.h"

#include "Toolbox.h"
#include <boost/lexical_cast.hpp>
#include <string>
#include <map>

namespace Orthanc
{
  namespace Toolbox
  {
    template <typename Enumeration>
    class EnumerationDictionary
    {
    private:
      typedef std::map<Enumeration, std::string>  EnumerationToString;
      typedef std::map<std::string, Enumeration>  StringToEnumeration;

      EnumerationToString enumerationToString_;
      StringToEnumeration stringToEnumeration_;

    public:
      void Clear()
      {
        enumerationToString_.clear();
        stringToEnumeration_.clear();
      }

      void Add(Enumeration value, const std::string& str)
      {
        // Check if these values are free
        if (enumerationToString_.find(value) != enumerationToString_.end() ||
            stringToEnumeration_.find(str) != stringToEnumeration_.end() ||
            Toolbox::IsInteger(str) /* Prevent the registration of a number */)
        {
          throw OrthancException(ErrorCode_BadRequest);
        }

        // OK, the string is free and is not a number
        enumerationToString_[value] = str;
        stringToEnumeration_[str] = value;
        stringToEnumeration_[boost::lexical_cast<std::string>(static_cast<int>(value))] = value;
      }

      Enumeration Translate(const std::string& str) const
      {
        try
        {
          int value = boost::lexical_cast<int>(str);
          return static_cast<Enumeration>(value);
        }
        catch (boost::bad_lexical_cast)
        {
        }

        typename StringToEnumeration::const_iterator
          found = stringToEnumeration_.find(str);

        if (found == stringToEnumeration_.end())
        {
          throw OrthancException(ErrorCode_InexistentItem);
        }
        else
        {
          return found->second;
        }
      }

      std::string Translate(Enumeration e) const
      {
        typename EnumerationToString::const_iterator
          found = enumerationToString_.find(e);

        if (found == enumerationToString_.end())
        {
          // No name for this item
          return boost::lexical_cast<std::string>(static_cast<int>(e));
        }
        else
        {
          return found->second;
        }
      }
    };
  }
}