// $Id: $

/***********************************************************************
Moses - factored phrase-based language decoder
Copyright (C) 2010 University of Edinburgh

This library 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 2.1 of the License, or (at your option) any later version.

This library 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 library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
***********************************************************************/

#ifndef moses_TranslationSystem_h
#define moses_TranslationSystem_h

#include <stdexcept>
#include <string>
#include <vector>

#include "FeatureFunction.h"
#include "LMList.h"

namespace Moses
{

class DecodeGraph;
class LexicalReordering;
class PhraseDictionaryFeature;
class GenerationDictionary;
class WordPenaltyProducer;
class DistortionScoreProducer;
class UnknownWordPenaltyProducer;
class GlobalLexicalModel;

/**
 * Enables the configuration of multiple translation systems.
**/
class TranslationSystem
{

public:
  /** Creates a system with the given id */
  TranslationSystem(const std::string& id,
                    const WordPenaltyProducer* wpProducer,
                    const UnknownWordPenaltyProducer* uwpProducer,
                    const DistortionScoreProducer* distortionProducer);

  //Insert core 'big' features
  void AddLanguageModel(LanguageModel* languageModel);
  void AddDecodeGraph(DecodeGraph* decodeGraph, size_t backoff);
  void AddReorderModel(LexicalReordering* reorderModel);
  void AddGlobalLexicalModel(GlobalLexicalModel* globalLexicalModel);

  //Insert non-core feature function
  void AddFeatureFunction(const FeatureFunction* featureFunction);

  //Called after adding the tables in order to set up the dictionaries
  void ConfigDictionaries();


  const std::string& GetId() const {
    return m_id;
  }

  //Lists of tables relevant to this system.
  const std::vector<LexicalReordering*>& GetReorderModels() const {
    return m_reorderingTables;
  }
  const std::vector<DecodeGraph*>& GetDecodeGraphs() const {
    return m_decodeGraphs;
  }
  const std::vector<size_t>& GetDecodeGraphBackoff() const {
    return m_decodeGraphBackoff;
  }
  const LMList& GetLanguageModels() const {
    return m_languageModels;
  }
  const std::vector<GenerationDictionary*>& GetGenerationDictionaries() const {
    return m_generationDictionaries;
  }
  const std::vector<PhraseDictionaryFeature*>& GetPhraseDictionaries() const {
    return m_phraseDictionaries;
  }

  const std::vector<const StatefulFeatureFunction*>& GetStatefulFeatureFunctions() const {
    return m_statefulFFs;
  }
  const std::vector<const StatelessFeatureFunction*>& GetStatelessFeatureFunctions() const {
    return m_statelessFFs;
  }

  const WordPenaltyProducer *GetWordPenaltyProducer() const {
    return m_wpProducer;
  }
  const UnknownWordPenaltyProducer *GetUnknownWordPenaltyProducer() const {
    return m_unknownWpProducer;
  }
  const DistortionScoreProducer* GetDistortionProducer() const {
    return m_distortionScoreProducer;
  }

  float GetWeightWordPenalty() const;
  float GetWeightUnknownWordPenalty() const;
  float GetWeightDistortion() const;

  //sentence (and thread) specific initialisationn and cleanup
  void InitializeBeforeSentenceProcessing(const InputType& source) const;
  void CleanUpAfterSentenceProcessing() const;



  static const  std::string DEFAULT;




private:
  std::string m_id;

  std::vector<DecodeGraph*> m_decodeGraphs;
  std::vector<size_t> m_decodeGraphBackoff;
  std::vector<LexicalReordering*> m_reorderingTables;
  std::vector<PhraseDictionaryFeature*> m_phraseDictionaries;
  std::vector<GenerationDictionary*> m_generationDictionaries;
  LMList m_languageModels;
  std::vector<GlobalLexicalModel*> m_globalLexicalModels;

  //All stateless FFs, except those that cache scores in T-Option
  std::vector<const StatelessFeatureFunction*> m_statelessFFs;
  //All statefull FFs
  std::vector<const StatefulFeatureFunction*> m_statefulFFs;

  const WordPenaltyProducer* m_wpProducer;
  const UnknownWordPenaltyProducer* m_unknownWpProducer;
  const DistortionScoreProducer* m_distortionScoreProducer;
};




}
#endif