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#ifndef MOZC_UNIX_IBUS_MESSAGE_TRANSLATOR_H_
#define MOZC_UNIX_IBUS_MESSAGE_TRANSLATOR_H_

#include <map>
#include <string>

namespace mozc {
namespace ibus {

// This class is responsible for translation from given message to
// the target message.
// TODO(team): Consider to use other libraries such as gettext.
class MessageTranslatorInterface {
 public:
  virtual ~MessageTranslatorInterface();

  // Returns translated string if possible.
  // Returns |message| if fails to translate.
  virtual std::string MaybeTranslate(const std::string &message) const = 0;
};

// This class never translates messages actually.
class NullMessageTranslator : public MessageTranslatorInterface {
 public:
  NullMessageTranslator();
  NullMessageTranslator(const NullMessageTranslator &) = delete;
  NullMessageTranslator &operator=(const NullMessageTranslator &) = delete;

  // Always returns |message|.
  std::string MaybeTranslate(const std::string &message) const override;
};

// Locale based translator. Currently only "ja_JP.UTF-8" is
// supported.
class LocaleBasedMessageTranslator : public MessageTranslatorInterface {
 public:
  LocaleBasedMessageTranslator(const LocaleBasedMessageTranslator &) = delete;
  LocaleBasedMessageTranslator &operator=(
      const LocaleBasedMessageTranslator &) = delete;
  explicit LocaleBasedMessageTranslator(const std::string &locale_name);
  std::string MaybeTranslate(const std::string &message) const override;

 private:
  std::map<std::string, std::string> utf8_japanese_map_;
};

}  // namespace ibus
}  // namespace mozc

#endif  // MOZC_UNIX_IBUS_MESSAGE_TRANSLATOR_H_
