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#ifndef MOZC_CONVERTER_CONVERTER_H_
#define MOZC_CONVERTER_CONVERTER_H_

#include <string>

#include "base/scoped_ptr.h"
#include "converter/converter_interface.h"
//  for FRIEND_TEST()
#include "testing/base/public/gunit_prod.h"

namespace mozc {

class ConversionRequest;
class ImmutableConverterInterface;
class POSMatcher;
class PredictorInterface;
class RewriterInterface;
class Segments;
class SuppressionDictionary;

class ConverterImpl : public ConverterInterface {
 public:
  ConverterImpl();
  virtual ~ConverterImpl();

  // Lazily initializes the internal members. Must be called before the use.
  void Init(const POSMatcher *pos_matcher,
            const SuppressionDictionary *suppression_dictionary,
            PredictorInterface *predictor,
            RewriterInterface *rewriter,
            ImmutableConverterInterface *immutable_converter);

  bool Predict(const ConversionRequest &request,
               const string &key,
               const Segments::RequestType request_type,
               Segments *segments) const;

  virtual bool StartConversionForRequest(const ConversionRequest &request,
                                         Segments *segments) const;
  virtual bool StartConversion(Segments *segments,
                               const string &key) const;
  virtual bool StartReverseConversion(Segments *segments,
                                      const string &key) const;
  virtual bool StartPredictionForRequest(const ConversionRequest &request,
                                         Segments *segments) const;
  virtual bool StartPrediction(Segments *segments,
                               const string &key) const;
  virtual bool StartSuggestionForRequest(const ConversionRequest &request,
                                         Segments *segments) const;
  virtual bool StartSuggestion(Segments *segments,
                               const string &key) const;
  virtual bool StartPartialPredictionForRequest(
      const ConversionRequest &request, Segments *segments) const;
  virtual bool StartPartialPrediction(Segments *segments,
                                      const string &key) const;
  virtual bool StartPartialSuggestionForRequest(
      const ConversionRequest &request, Segments *segments) const;
  virtual bool StartPartialSuggestion(Segments *segments,
                                      const string &key) const;

  virtual bool FinishConversion(const ConversionRequest &request,
                                Segments *segments) const;
  virtual bool CancelConversion(Segments *segments) const;
  virtual bool ResetConversion(Segments *segments) const;
  virtual bool RevertConversion(Segments *segments) const;
  virtual bool ReconstructHistory(Segments *segments,
                                  const string &preceding_text) const;

  virtual bool CommitSegmentValue(Segments *segments,
                                  size_t segment_index,
                                  int candidate_index) const;
  virtual bool CommitPartialSuggestionSegmentValue(
      Segments *segments,
      size_t segment_index,
      int candidate_index,
      const string &current_segment_key,
      const string &new_segment_key) const;
  virtual bool FocusSegmentValue(Segments *segments,
                                 size_t segment_index,
                                 int candidate_index) const;
  virtual bool FreeSegmentValue(Segments *segments,
                                size_t segment_index) const;
  virtual bool CommitSegments(Segments *segments,
                              const vector<size_t> &candidate_index) const;
  virtual bool ResizeSegment(Segments *segments,
                             const ConversionRequest &requset,
                             size_t segment_index,
                             int offset_length) const;
  virtual bool ResizeSegment(Segments *segments,
                             const ConversionRequest &requset,
                             size_t start_segment_index,
                             size_t segments_size,
                             const uint8 *new_size_array,
                             size_t array_size) const;

 private:
  FRIEND_TEST(ConverterTest, CompletePOSIds);
  FRIEND_TEST(ConverterTest, DefaultPredictor);
  FRIEND_TEST(ConverterTest, MaybeSetConsumedKeySizeToSegment);
  FRIEND_TEST(ConverterTest, GetLastConnectivePart);

  // Complete Left id/Right id if they are not defined.
  // Some users don't push conversion button but directly
  // input hiragana sequence only with composition mode. Converter
  // cannot know which POS ids should be used for these directly-
  // input strings. This function estimates IDs from value heuristically.
  void CompletePOSIds(Segment::Candidate *candidate) const;

  bool CommitSegmentValueInternal(Segments *segments,
                                  size_t segment_index,
                                  int candidate_index,
                                  Segment::SegmentType segment_type) const;

  // Sets all the candidates' attribute PARTIALLY_KEY_CONSUMED
  // and consumed_key_size if the attribute is not set.
  static void MaybeSetConsumedKeySizeToCandidate(size_t consumed_key_size,
                                                 Segment::Candidate* candidate);

  // Sets all the candidates' attribute PARTIALLY_KEY_CONSUMED
  // and consumed_key_size if the attribute is not set.
  static void MaybeSetConsumedKeySizeToSegment(size_t consumed_key_size,
                                               Segment* segment);

  // Rewrites and applies the suppression dictionary.
  void RewriteAndSuppressCandidates(const ConversionRequest &request,
                                    Segments *segments) const;

  // Commits usage stats for committed text.
  // |begin_segment_index| is a index of whole segments. (history and conversion
  // segments)
  void CommitUsageStats(const Segments *segments,
                        size_t begin_segment_index,
                        size_t segment_length) const;

  // Returns the substring of |str|. This substring consists of similar script
  // type and you can use it as preceding text for conversion.
  bool GetLastConnectivePart(const string &preceding_text,
                             string *key,
                             string *value,
                             uint16 *id) const;

  const POSMatcher *pos_matcher_;
  const SuppressionDictionary *suppression_dictionary_;
  scoped_ptr<PredictorInterface> predictor_;
  scoped_ptr<RewriterInterface> rewriter_;
  const ImmutableConverterInterface *immutable_converter_;
  uint16 general_noun_id_;
};

}  // namespace mozc

#endif  // MOZC_CONVERTER_CONVERTER_H_