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#ifndef MOZC_DICTIONARY_USER_DICTIONARY_H_
#define MOZC_DICTIONARY_USER_DICTIONARY_H_

#include <string>
#include <vector>

#include "base/port.h"
#include "base/scoped_ptr.h"
#include "base/string_piece.h"
#include "dictionary/dictionary_interface.h"
#include "dictionary/pos_matcher.h"
#include "dictionary/suppression_dictionary.h"
#include "dictionary/user_dictionary_storage.pb.h"
#include "dictionary/user_pos_interface.h"

namespace mozc {

class ReaderWriterMutex;

namespace dictionary {

class UserDictionary : public DictionaryInterface {
 public:
  UserDictionary(const UserPOSInterface *user_pos,
                 const POSMatcher *pos_matcher,
                 SuppressionDictionary *suppression_dictionary);
  virtual ~UserDictionary();

  virtual bool HasKey(StringPiece key) const;
  virtual bool HasValue(StringPiece value) const;
  // Lookup methods don't support kana modifier insensitive lookup, i.e.,
  // Callback::OnActualKey() is never called.
  virtual void LookupPredictive(
      StringPiece key, bool use_kana_modifier_insensitive_lookup,
      Callback *callback) const;
  virtual void LookupPrefix(
      StringPiece key, bool use_kana_modifier_insensitive_lookup,
      Callback *callback) const;
  virtual void LookupExact(StringPiece key, Callback *callback) const;
  virtual void LookupReverse(StringPiece str, Callback *callback) const;

  // Looks up a user comment from a pair of key and value.  When (key, value)
  // doesn't exist in this dictionary or user comment is empty, bool is
  // returned and string is kept as-is.
  virtual bool LookupComment(StringPiece key, StringPiece value,
                             string *comment) const;

  // Loads dictionary from UserDictionaryStorage.
  // mainly for unittesting
  bool Load(const user_dictionary::UserDictionaryStorage &storage);

  // Reloads dictionary asynchronously
  bool Reload();

  // Waits until reloader finishes
  void WaitForReloader();

  // Adds new word to auto registered dictionary and reload asynchronously.
  // Note that this method will not guarantee that
  // new word is added successfully, since the actual
  // dictionary modification is done by other thread.
  // Also, this method should be called by the main converter thread which
  // is executed synchronously with user input.
  bool AddToAutoRegisteredDictionary(
      const string &key, const string &value,
      user_dictionary::UserDictionary::PosType pos);

  // Sets user dicitonary filename for unittesting
  static void SetUserDictionaryName(const string &filename);

 private:
  class TokensIndex;
  class UserDictionaryReloader;

  // Swaps internal tokens index to |new_tokens|.
  void Swap(TokensIndex *new_tokens);

  scoped_ptr<UserDictionaryReloader> reloader_;
  scoped_ptr<const UserPOSInterface> user_pos_;
  const POSMatcher *pos_matcher_;
  SuppressionDictionary *suppression_dictionary_;
  TokensIndex *tokens_;
  mutable scoped_ptr<ReaderWriterMutex> mutex_;

  friend class UserDictionaryTest;
  DISALLOW_COPY_AND_ASSIGN(UserDictionary);
};

}  // namespace dictionary
}  // namespace mozc

#endif  // MOZC_DICTIONARY_USER_DICTIONARY_H_