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#ifndef MOZC_DICTIONARY_DICTIONARY_IMPL_H_
#define MOZC_DICTIONARY_DICTIONARY_IMPL_H_

#include <memory>
#include <vector>

#include "base/port.h"
#include "base/string_piece.h"
#include "dictionary/dictionary_interface.h"
#include "dictionary/pos_matcher.h"
#include "dictionary/suppression_dictionary.h"

namespace mozc {
namespace dictionary {

class DictionaryImpl : public DictionaryInterface {
 public:
  // Initializes a dictionary with given dictionaries and POS data.  The system
  // and value dictionaries are owned by this class but the user dictionary is
  // just a reference and to be deleted by the caller. Note that the user
  // dictionary is not a const reference because this class may reload the user
  // dictionary.
  // TODO(noriyukit): Currently DictionaryInterface::Reload() is not used and
  // thus user_dictionary can be const as well. We can make it const after
  // clarifying the ownership of the user dictionary and changing code so that
  // the owner reloads it.
  DictionaryImpl(const DictionaryInterface *system_dictionary,
                 const DictionaryInterface *value_dictionary,
                 DictionaryInterface *user_dictionary,
                 const SuppressionDictionary *suppression_dictionary,
                 const POSMatcher *pos_matcher);

  virtual ~DictionaryImpl();

  virtual bool HasKey(StringPiece key) const;
  virtual bool HasValue(StringPiece value) const;
  virtual void LookupPredictive(StringPiece key,
                                const ConversionRequest &conversion_request,
                                Callback *callback) const;
  virtual void LookupPrefix(StringPiece key,
                            const ConversionRequest &conversion_request,
                            Callback *callback) const;

  virtual void LookupExact(StringPiece key,
                           const ConversionRequest &conversion_request,
                           Callback *callback) const;

  virtual void LookupReverse(StringPiece str,
                             const ConversionRequest &conversion_request,
                             Callback *callback) const;

  virtual bool LookupComment(StringPiece key, StringPiece value,
                             const ConversionRequest &conversion_request,
                             string *comment) const;
  virtual bool Reload();
  virtual void PopulateReverseLookupCache(StringPiece str) const;
  virtual void ClearReverseLookupCache() const;

 private:
  enum LookupType {
    PREDICTIVE,
    PREFIX,
    REVERSE,
    EXACT,
  };

  // Used to check POS IDs.
  const POSMatcher *pos_matcher_;

  // Main three dictionaries.
  std::unique_ptr<const DictionaryInterface> system_dictionary_;
  std::unique_ptr<const DictionaryInterface> value_dictionary_;
  DictionaryInterface *user_dictionary_;

  // Convenient container to handle the above three dictionaries as one
  // composite dictionary.
  std::vector<const DictionaryInterface *> dics_;

  // Suppression dictionary is used to suppress entries.
  const SuppressionDictionary *suppression_dictionary_;

  DISALLOW_COPY_AND_ASSIGN(DictionaryImpl);
};

}  // namespace dictionary
}  // namespace mozc

#endif  // MOZC_DICTIONARY_DICTIONARY_IMPL_H_