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#ifndef MOZC_REWRITER_USAGE_REWRITER_H_
#define MOZC_REWRITER_USAGE_REWRITER_H_

#include <list>
#include <map>
#include <string>
#include <utility>

#include "converter/segments.h"
#include "rewriter/rewriter_interface.h"
#include "rewriter/usage_rewriter_data_structs.h"
#include "testing/base/public/gunit_prod.h"  // for FRIEND_TEST()

namespace mozc {

class ConversionRequest;
class DataManagerInterface;
class DictionaryInterface;
class POSMatcher;

class UsageRewriter : public RewriterInterface  {
 public:
  UsageRewriter(const DataManagerInterface *data_manager,
                const DictionaryInterface *dictionary);
  virtual ~UsageRewriter();
  virtual bool Rewrite(const ConversionRequest &request,
                       Segments *segments) const;

  // better to show usage when user type "tab" key.
  virtual int capability(const ConversionRequest &request) const {
    return CONVERSION | PREDICTION;
  }

 private:
  FRIEND_TEST(UsageRewriterTest, GetKanjiPrefixAndOneHiragana);

  typedef pair<string, string> StrPair;
  static string GetKanjiPrefixAndOneHiragana(const string &word);

  const UsageDictItem *LookupUnmatchedUsageHeuristically(
      const Segment::Candidate &candidate) const;
  const UsageDictItem *LookupUsage(
      const Segment::Candidate &candidate) const;

  map<StrPair, const UsageDictItem *> key_value_usageitem_map_;
  const POSMatcher *pos_matcher_;
  const DictionaryInterface *dictionary_;
  const ConjugationSuffix *base_conjugation_suffix_;
};

}  // namespace mozc

#endif  // MOZC_REWRITER_USAGE_REWRITER_H_