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#ifndef MOZC_REWRITER_FOCUS_CANDIDATE_REWRITER_H_
#define MOZC_REWRITER_FOCUS_CANDIDATE_REWRITER_H_

#include "base/port.h"
#include "converter/segments.h"
#include "rewriter/rewriter_interface.h"

namespace mozc {

class ConversionRequest;
class DataManagerInterface;
class POSMatcher;
struct CounterSuffixEntry;

class FocusCandidateRewriter : public RewriterInterface  {
 public:
  explicit FocusCandidateRewriter(const DataManagerInterface *data_manager);
  virtual ~FocusCandidateRewriter();

  // Changed the focus of "segment_index"-th segment to be "candidate_index".
  // The segments will be written according to pre-defined "actions".
  // Currently, FocusSegmentValue() finds bracket/parentheses matching, e.g,
  // When user chooses "(" in some candidate, corresponding close bracket ")"
  // is automatically placed at the top.
  bool Focus(Segments *segments,
             size_t segment_index,
             int candidate_index) const;

  virtual bool Rewrite(const ConversionRequest &request,
                       Segments *segments) const {
    return false;
  }

 private:
  // Performs reranking of number candidates to make numbers consistent across
  // multiple segments.
  bool RerankNumberCandidates(Segments *segments,
                              size_t segment_index,
                              int candidate_index) const;

  // Finds an index of candidate in |seg| that matches the given number script
  // type and suffix.  Returns -1 if there's no candidate matching the
  // condition.
  int FindMatchingCandidates(
      const Segment &seg, uint32 ref_script_type, StringPiece ref_suffix) const;

  // Parses the value of a candidate into number and counter suffix.
  // Simultaneously checks the script type of number.  Here, number candiate is
  // defined to be the following pattern:
  //   * [数][助数詞][並立助詞]?  (e.g., 一階, 二回, ３階や, etc.)
  // Returns false if the value of candidate doesn't match the pattern.
  bool ParseNumberCandidate(const Segment::Candidate &cand,
                            StringPiece* number, StringPiece* suffix,
                            uint32 *script_type) const;

  const CounterSuffixEntry *suffix_array_;
  size_t suffix_array_size_;
  const POSMatcher *pos_matcher_;

  DISALLOW_COPY_AND_ASSIGN(FocusCandidateRewriter);
};

}  // namespace mozc

#endif  // MOZC_REWRITER_FOCUS_CANDIDATE_REWRITER_H_