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// notice, this list of conditions and the following disclaimer.
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#include "base/text_normalizer.h"

#include <string>

#include "base/base.h"
#include "base/util.h"

namespace mozc {
namespace {

// http://www.ingrid.org/java/i18n/unicode-sjis.html

// Unicode vender specific character table:
// http://www.ingrid.org/java/i18n/unicode-sjis.html
// http://hp.vector.co.jp/authors/VA010341/unicode/
// http://www.notoinsatu.co.jp/font/omake/OTF_other.pdf
//
// Example: WAVE_DASH / FULLWIDTH TILDE
// http://ja.wikipedia.org/wiki/%E6%B3%A2%E3%83%80%E3%83%83%E3%82%B7%E3%83%A5
// Windows CP932 (shift-jis) maps WAVE_DASH to FULL_WIDTH_TILDA.
// Since the font of WAVE-DASH is ugly on Windows, here we convert WAVE-DHASH to
// FULL_WIDTH_TILDA as CP932 does.
#ifdef OS_WINDOWS
inline char32 ConvertVenderSpecificCharacter(char32 c) {
  switch (c) {
    case 0x00A5:   // YEN SIGN
      return 0x005C;   // REVERSE SOLIDUS
      break;
    case 0x203E:   // OVERLINE
      return 0x007E;  // TILDE
      break;
    case 0x301C:  // WAVE DASH
      return 0xFF5E;   // FULLWIDTH TILDE
      break;
    case 0x2016:   // DOUBLE VERTICAL LINE
      return 0x2225;   // PARALLEL TO
      break;
    case 0x2212:  // MINUS SIGN
      return 0xFF0D;   // FULLWIDTH HYPHEN MINUS
      break;
    case 0x00A2:   // CENT SIGN
      return 0xFFE0;    // FULLWIDTH CENT SIGN
      break;
    case 0x00A3:   // POUND SIGN
      return 0xFFE1;   // FULLWIDTH POUND SIGN
      break;
    case 0x00AC:   // NOT SIGN
      return 0xFFE2;   // FULLWIDTH NOT SIGN
      break;
    default:
      return c;
      break;
  }
}

#else   // MAC & Linux
inline char32 ConvertVenderSpecificCharacter(char32 c) {
  return c;
}
#endif

void ConvertVenderSpecificString(const string &input, string *output) {
  const char *begin = input.data();
  const char *end = begin + input.size();
  output->clear();
  while (begin < end) {
    size_t mblen = 0;
    const char32 ucs4 = Util::UTF8ToUCS4(begin, end, &mblen);
    const char32 new_ucs4 = ConvertVenderSpecificCharacter(ucs4);
    if (new_ucs4 == ucs4) {  // the same code point
      output->append(begin, mblen);
    } else {
      Util::UCS4ToUTF8Append(new_ucs4, output);
    }
    begin += mblen;
  }
}

}  // namespace

void TextNormalizer::NormalizePreeditText(const string &input,
                                          string *output) {
  string tmp;
  // This is a workaround for hiragana v'
  //  Util::StringReplace(input, "ゔ", "ヴ", true, &tmp);
  Util::StringReplace(input, "\xE3\x82\x94", "\xE3\x83\xB4", true, &tmp);

  ConvertVenderSpecificString(tmp, output);
}

void TextNormalizer::NormalizeTransliterationText(const string &input,
                                                  string *output) {
  // Do the same thing with NormalizePreeditText at this morment.
  NormalizePreeditText(input, output);
}

void TextNormalizer::NormalizeConversionText(const string &input,
                                             string *output) {
  ConvertVenderSpecificString(input, output);
}

void TextNormalizer::NormalizeCandidateText(const string &input,
                                            string *output) {
  ConvertVenderSpecificString(input, output);
}


}  // namespace mozc