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#include "composer/internal/transliterators_ja.h"

#include "base/singleton.h"
#include "base/util.h"
#include "converter/character_form_manager.h"

namespace mozc {
namespace composer {

namespace {

class DefaultTransliterator : public TransliteratorInterface {
 public:
  virtual ~DefaultTransliterator() {}

  string Transliterate(const string &raw, const string &converted) const {
    string output;
    CharacterFormManager::GetCharacterFormManager()->
        ConvertPreeditString(converted, &output);
    return output;
  }

  // NOTE(komatsu): The first argument, size_t postion, should not be
  // const because this function overrides the virtual function of
  // TransliterateInterface whose first argument is not const.
  // Otherwise the Windows compiler (cl.exe) raises an error.
  bool Split(size_t position,
             const string &raw,
             const string &converted,
             string *raw_lhs, string *raw_rhs,
             string *converted_lhs, string *converted_rhs) const {
    return Transliterators::SplitConverted(
        position, raw, converted,
        raw_lhs, raw_rhs, converted_lhs, converted_rhs);
  }
};

class HiraganaTransliterator : public TransliteratorInterface {
 public:
  virtual ~HiraganaTransliterator() {}

  string Transliterate(const string &raw, const string &converted) const {
    string output;
    CharacterFormManager::GetCharacterFormManager()->
        ConvertPreeditString(converted, &output);
    return output;
  }

  bool Split(size_t position,
             const string &raw,
             const string &converted,
             string *raw_lhs, string *raw_rhs,
             string *converted_lhs, string *converted_rhs) const {
    return Transliterators::SplitConverted(
        position, raw, converted,
        raw_lhs, raw_rhs, converted_lhs, converted_rhs);
  }
};

class FullKatakanaTransliterator : public TransliteratorInterface {
 public:
  virtual ~FullKatakanaTransliterator() {}

  string Transliterate(const string &raw, const string &converted) const {
    string t13n;
    Util::HiraganaToKatakana(converted, &t13n);

    string output;
    CharacterFormManager::GetCharacterFormManager()->
        ConvertPreeditString(t13n, &output);
    return output;
  }

  bool Split(size_t position,
             const string &raw,
             const string &converted,
             string *raw_lhs, string *raw_rhs,
             string *converted_lhs, string *converted_rhs) const {
    return Transliterators::SplitConverted(
        position, raw, converted,
        raw_lhs, raw_rhs, converted_lhs, converted_rhs);
  }
};

class HalfKatakanaTransliterator : public TransliteratorInterface {
 public:
  virtual ~HalfKatakanaTransliterator() {}

  static void HalfKatakanaToHiragana(const string &half_katakana,
                                     string *hiragana) {
    string full_katakana;
    Util::HalfWidthKatakanaToFullWidthKatakana(half_katakana, &full_katakana);
    Util::KatakanaToHiragana(full_katakana, hiragana);
  }

  string Transliterate(const string &raw, const string &converted) const {
    string t13n;
    string katakana_output;
    Util::HiraganaToKatakana(converted, &katakana_output);
    Util::FullWidthToHalfWidth(katakana_output, &t13n);
    return t13n;
  }

  bool Split(size_t position,
             const string &raw,
             const string &converted,
             string *raw_lhs, string *raw_rhs,
             string *converted_lhs, string *converted_rhs) const {
    const string half_katakana = Transliterate(raw, converted);
    string hk_raw_lhs, hk_raw_rhs, hk_converted_lhs, hk_converted_rhs;
    const bool result = Transliterators::SplitConverted(
        position, raw, half_katakana,
        &hk_raw_lhs, &hk_raw_rhs, &hk_converted_lhs, &hk_converted_rhs);

    if (result) {
      *raw_lhs = hk_raw_lhs;
      *raw_rhs = hk_raw_rhs;
    } else {
      HalfKatakanaToHiragana(hk_raw_lhs, raw_lhs);
      HalfKatakanaToHiragana(hk_raw_rhs, raw_rhs);
    }
    HalfKatakanaToHiragana(hk_converted_lhs, converted_lhs);
    HalfKatakanaToHiragana(hk_converted_rhs, converted_rhs);
    return result;
  }
};

class HalfAsciiTransliterator : public TransliteratorInterface {
 public:
  virtual ~HalfAsciiTransliterator() {}

  string Transliterate(const string &raw, const string &converted) const {
    string t13n;
    const string &input = raw.empty() ? converted : raw;
    Util::FullWidthAsciiToHalfWidthAscii(input, &t13n);
    return t13n;
  }

  bool Split(size_t position,
             const string &raw,
             const string &converted,
             string *raw_lhs, string *raw_rhs,
             string *converted_lhs, string *converted_rhs) const {
    return Transliterators::SplitRaw(
        position, raw, converted,
        raw_lhs, raw_rhs, converted_lhs, converted_rhs);
  }
};

class FullAsciiTransliterator : public TransliteratorInterface {
 public:
  virtual ~FullAsciiTransliterator() {}

  string Transliterate(const string &raw, const string &converted) const {
    string t13n;
    const string &input = raw.empty() ? converted : raw;
    Util::HalfWidthAsciiToFullWidthAscii(input, &t13n);
    return t13n;
  }

  bool Split(size_t position,
             const string &raw,
             const string &converted,
             string *raw_lhs, string *raw_rhs,
             string *converted_lhs, string *converted_rhs) const {
    return Transliterators::SplitRaw(
        position, raw, converted,
        raw_lhs, raw_rhs, converted_lhs, converted_rhs);
  }
};

}  // anonymous namespace

// static
// const TransliteratorInterface*
// TransliteratorsJa::GetDefaultTransliterator() {
//   return Singleton<DefaultTransliterator>::get();
// }

// static
const TransliteratorInterface*
TransliteratorsJa::GetHiraganaTransliterator() {
  return Singleton<HiraganaTransliterator>::get();
}

// static
const TransliteratorInterface*
TransliteratorsJa::GetFullKatakanaTransliterator() {
  return Singleton<FullKatakanaTransliterator>::get();
}

// static
const TransliteratorInterface*
TransliteratorsJa::GetHalfKatakanaTransliterator() {
  return Singleton<HalfKatakanaTransliterator>::get();
}

// static
const TransliteratorInterface*
TransliteratorsJa::GetFullAsciiTransliterator() {
  return Singleton<FullAsciiTransliterator>::get();
}

// static
const TransliteratorInterface*
TransliteratorsJa::GetHalfAsciiTransliterator() {
  return Singleton<HalfAsciiTransliterator>::get();
}
}  // namespace composer
}  // namespace mozc