#include "Runtime/GuiSys/CTextParser.hpp"

#include "Runtime/GuiSys/CFontImageDef.hpp"
#include "Runtime/GuiSys/CTextExecuteBuffer.hpp"

namespace urde {

static float u16stof(char16_t* str) {
  char cstr[16];
  int i;
  for (i = 0; i < 15 && str[i] != u'\0'; ++i)
    cstr[i] = str[i];
  cstr[i] = '\0';
  return strtof(cstr, nullptr);
}

CTextColor CTextParser::ParseColor(const char16_t* str, int len) {
  u8 r = GetColorValue(str + 1);
  u8 g = GetColorValue(str + 3);
  u8 b = GetColorValue(str + 5);
  u8 a = 0xff;
  if (len == 9)
    a = GetColorValue(str + 7);
  CTextColor ret;
  ret.fromRGBA8(r, g, b, a);
  return ret;
}

u8 CTextParser::GetColorValue(const char16_t* str) { return (FromHex(str[0]) << 4) + FromHex(str[1]); }

u32 CTextParser::FromHex(char16_t ch) {
  if (ch >= u'0' && ch <= u'9')
    return ch - u'0';

  if (ch >= u'A' && ch <= u'F')
    return ch - u'A' + 10;

  if (ch >= u'a' && ch <= u'f')
    return ch - u'a' + 10;

  return 0;
}

s32 CTextParser::ParseInt(const char16_t* str, int len, bool signVal) {
  bool neg = false;
  int procCur = 0;
  if (signVal && len && *str == u'-') {
    neg = true;
    procCur = 1;
  }

  int val = 0;
  while (len > procCur) {
    val *= 10;
    wchar_t ch = str[procCur];
    val += ch - u'0';
    ++procCur;
  }

  return neg ? -val : val;
}

bool CTextParser::Equals(const char16_t* str, int len, const char16_t* other) {
  for (int i = 0; *other && i < len; ++i, ++str, ++other) {
    if (*str != *other)
      return false;
  }
  return *other == u'\0';
}

bool CTextParser::BeginsWith(const char16_t* str, int len, const char16_t* other) {
  for (int i = 0; *other && i < len; ++i, ++str, ++other) {
    if (*str != *other)
      return false;
  }
  return true;
}

void CTextParser::ParseTag(CTextExecuteBuffer& out, const char16_t* str, int len,
                           const std::vector<std::pair<CAssetId, CAssetId>>* txtrMap) {
  if (BeginsWith(str, len, u"font=")) {
    TToken<CRasterFont> font = GetFont(str + 5, len - 5);
    out.AddFont(font);
  } else if (BeginsWith(str, len, u"image=")) {
    CFontImageDef image = GetImage(str + 6, len - 6, txtrMap);
    out.AddImage(image);
  } else if (BeginsWith(str, len, u"fg-color=")) {
    CTextColor color = ParseColor(str + 9, len - 9);
    out.AddColor(EColorType::Foreground, color);
  } else if (BeginsWith(str, len, u"main-color=")) {
    CTextColor color = ParseColor(str + 11, len - 11);
    out.AddColor(EColorType::Main, color);
  } else if (BeginsWith(str, len, u"geometry-color=")) {
    CTextColor color = ParseColor(str + 15, len - 15);
    out.AddColor(EColorType::Geometry, color);
  } else if (BeginsWith(str, len, u"outline-color=")) {
    CTextColor color = ParseColor(str + 14, len - 14);
    out.AddColor(EColorType::Outline, color);
  } else if (BeginsWith(str, len, u"color")) {
    const char16_t* valCur = str + 7;
    len -= 7;
    int val = str[6] - u'0';
    if (str[7] >= u'0' && str[7] <= u'9') {
      ++valCur;
      --len;
      val *= 10;
      val += str[7] - u'0';
    }

    if (Equals(valCur + 10, len - 10, u"no"))
      out.AddRemoveColorOverride(val);
    else {
      CTextColor color = ParseColor(str + 10, len - 10);
      out.AddColorOverride(val, color);
    }
  } else if (BeginsWith(str, len, u"line-spacing=")) {
    out.AddLineSpacing(ParseInt(str + 13, len - 13, true) / 100.0f);
  } else if (BeginsWith(str, len, u"line-extra-space=")) {
    out.AddLineExtraSpace(ParseInt(str + 17, len - 17, true));
  } else if (BeginsWith(str, len, u"just=")) {
    if (Equals(str + 5, len - 5, u"left"))
      out.AddJustification(EJustification::Left);
    else if (Equals(str + 5, len - 5, u"center"))
      out.AddJustification(EJustification::Center);
    else if (Equals(str + 5, len - 5, u"right"))
      out.AddJustification(EJustification::Right);
    else if (Equals(str + 5, len - 5, u"full"))
      out.AddJustification(EJustification::Full);
    else if (Equals(str + 5, len - 5, u"nleft"))
      out.AddJustification(EJustification::NLeft);
    else if (Equals(str + 5, len - 5, u"ncenter"))
      out.AddJustification(EJustification::NCenter);
    else if (Equals(str + 5, len - 5, u"nright"))
      out.AddJustification(EJustification::NRight);
  } else if (BeginsWith(str, len, u"vjust=")) {
    if (Equals(str + 6, len - 6, u"top"))
      out.AddVerticalJustification(EVerticalJustification::Top);
    else if (Equals(str + 6, len - 6, u"center"))
      out.AddVerticalJustification(EVerticalJustification::Center);
    else if (Equals(str + 6, len - 6, u"bottom"))
      out.AddVerticalJustification(EVerticalJustification::Bottom);
    else if (Equals(str + 6, len - 6, u"full"))
      out.AddVerticalJustification(EVerticalJustification::Full);
    else if (Equals(str + 6, len - 6, u"ntop"))
      out.AddVerticalJustification(EVerticalJustification::NTop);
    else if (Equals(str + 6, len - 6, u"ncenter"))
      out.AddVerticalJustification(EVerticalJustification::NCenter);
    else if (Equals(str + 6, len - 6, u"nbottom"))
      out.AddVerticalJustification(EVerticalJustification::NBottom);
  } else if (Equals(str, len, u"push")) {
    out.AddPushState();
  } else if (Equals(str, len, u"pop")) {
    out.AddPopState();
  }
}

CFontImageDef CTextParser::GetImage(const char16_t* str, int len,
                                    const std::vector<std::pair<CAssetId, CAssetId>>* txtrMap) {
  int commaCount = 0;
  for (int i = 0; i < len; ++i)
    if (str[i] == u',')
      ++commaCount;

  if (commaCount) {
    std::u16string iterable(str, len);
    size_t tokenPos;
    size_t commaPos;
    commaPos = iterable.find(u',');
    iterable[commaPos] = u'\0';
    tokenPos = commaPos + 1;

    auto AdvanceCommaPos = [&]() {
      commaPos = iterable.find(u',', tokenPos);
      if (commaPos == std::u16string::npos)
        commaPos = iterable.size();
      iterable[commaPos] = u'\0';
    };

    auto AdvanceTokenPos = [&]() { tokenPos = commaPos + 1; };

    if (BeginsWith(str, len, u"A")) {
      /* Animated texture array */
      AdvanceCommaPos();
      float interval = u16stof(&iterable[tokenPos]);
      AdvanceTokenPos();

      std::vector<TToken<CTexture>> texs;
      texs.reserve(commaCount - 1);
      do {
        AdvanceCommaPos();
        texs.emplace_back(x0_store.GetObj({SBIG('TXTR'), GetAssetIdFromString(&iterable[tokenPos], len, txtrMap)}));
        AdvanceTokenPos();
      } while (commaPos != iterable.size());

      return CFontImageDef(texs, interval, zeus::CVector2f(1.f, 1.f));
    } else if (BeginsWith(str, len, u"SA")) {
      /* Scaled and animated texture array */
      AdvanceCommaPos();
      float interval = u16stof(&iterable[tokenPos]);
      AdvanceTokenPos();

      AdvanceCommaPos();
      float cropX = u16stof(&iterable[tokenPos]);
      AdvanceTokenPos();

      AdvanceCommaPos();
      float cropY = u16stof(&iterable[tokenPos]);
      AdvanceTokenPos();

      std::vector<TToken<CTexture>> texs;
      texs.reserve(commaCount - 3);
      do {
        AdvanceCommaPos();
        texs.emplace_back(x0_store.GetObj({SBIG('TXTR'), GetAssetIdFromString(&iterable[tokenPos], len, txtrMap)}));
        AdvanceTokenPos();
      } while (commaPos != iterable.size());

      return CFontImageDef(texs, interval, zeus::CVector2f(cropX, cropY));
    } else if (BeginsWith(str, len, u"SI")) {
      /* Scaled single texture */
      AdvanceCommaPos();
      float cropX = u16stof(&iterable[tokenPos]);
      AdvanceTokenPos();

      AdvanceCommaPos();
      float cropY = u16stof(&iterable[tokenPos]);
      AdvanceTokenPos();

      AdvanceCommaPos();
      TToken<CTexture> tex = x0_store.GetObj({SBIG('TXTR'), GetAssetIdFromString(&iterable[tokenPos], len, txtrMap)});
      AdvanceTokenPos();

      return CFontImageDef(tex, zeus::CVector2f(cropX, cropY));
    }
  }

  TToken<CTexture> tex = x0_store.GetObj({SBIG('TXTR'), GetAssetIdFromString(str, len, txtrMap)});
  return CFontImageDef(tex, zeus::CVector2f(1.f, 1.f));
}

CAssetId CTextParser::GetAssetIdFromString(const char16_t* str, int len,
                                           const std::vector<std::pair<CAssetId, CAssetId>>* txtrMap) {
  u8 r = GetColorValue(str);
  u8 g = GetColorValue(str + 2);
  u8 b = GetColorValue(str + 4);
  u8 a = GetColorValue(str + 6);
  CAssetId id = ((r << 24) | (g << 16) | (b << 8) | a) & 0xffffffff;

  if (len == 16) {
    r = GetColorValue(str + 8);
    g = GetColorValue(str + 10);
    b = GetColorValue(str + 12);
    a = GetColorValue(str + 14);
    id = (id.Value() << 32) | (((r << 24) | (g << 16) | (b << 8) | a) & 0xffffffff);
  }

  if (txtrMap) {
    auto search = rstl::binary_find(txtrMap->begin(), txtrMap->end(), id,
                                    [](const std::pair<CAssetId, CAssetId>& a) { return a.first; });
    if (search != txtrMap->end())
      id = search->second;
  }

  return id;
}

TToken<CRasterFont> CTextParser::GetFont(const char16_t* str, int len) {
  return x0_store.GetObj({SBIG('FONT'), GetAssetIdFromString(str, len, nullptr)});
}

void CTextParser::ParseText(CTextExecuteBuffer& out, const char16_t* str, int len,
                            const std::vector<std::pair<CAssetId, CAssetId>>* txtrMap) {
  int b = 0, e = 0;
  for (b = 0, e = 0; str[e] && (len == -1 || e < len);) {
    if (str[e] != u'&') {
      ++e;
      continue;
    }
    if ((len == -1 || e + 1 < len) && str[e + 1] != u'&') {
      if (e > b)
        out.AddString(str + b, e - b);
      ++e;
      b = e;

      while (str[e] && (len == -1 || e < len) && str[e] != u';')
        ++e;

      ParseTag(out, str + b, e - b, txtrMap);
      b = e + 1;
    } else {
      out.AddString(str + b, e + 1 - b);
      e += 2;
      b = e;
    }
  }

  if (e > b)
    out.AddString(str + b, e - b);
}

} // namespace urde