// Copyright 2014 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com

#include "xfa/fgas/font/fgas_gefont.h"

#include "xfa/fgas/crt/fgas_codepage.h"
#include "xfa/fgas/font/fgas_fontutils.h"
#include "xfa/fxfa/include/xfa_fontmgr.h"

// static
CFGAS_GEFont* CFGAS_GEFont::LoadFont(const FX_WCHAR* pszFontFamily,
                                     uint32_t dwFontStyles,
                                     uint16_t wCodePage,
                                     IFGAS_FontMgr* pFontMgr) {
#if _FXM_PLATFORM_ != _FXM_PLATFORM_WINDOWS_
  if (NULL != pFontMgr) {
    return pFontMgr->GetFontByCodePage(wCodePage, dwFontStyles, pszFontFamily);
  }
  return NULL;
#else
  CFGAS_GEFont* pFont = new CFGAS_GEFont(pFontMgr);
  if (!pFont->LoadFontInternal(pszFontFamily, dwFontStyles, wCodePage)) {
    pFont->Release();
    return NULL;
  }
  return pFont;
#endif
}

// static
CFGAS_GEFont* CFGAS_GEFont::LoadFont(CFX_Font* pExtFont,
                                     IFGAS_FontMgr* pFontMgr) {
  CFGAS_GEFont* pFont = new CFGAS_GEFont(pFontMgr);
  if (!pFont->LoadFontInternal(pExtFont)) {
    pFont->Release();
    return NULL;
  }
  return pFont;
}

#if _FXM_PLATFORM_ == _FXM_PLATFORM_WINDOWS_
// static
CFGAS_GEFont* CFGAS_GEFont::LoadFont(const uint8_t* pBuffer,
                                     int32_t iLength,
                                     IFGAS_FontMgr* pFontMgr) {
  CFGAS_GEFont* pFont = new CFGAS_GEFont(pFontMgr);
  if (!pFont->LoadFontInternal(pBuffer, iLength)) {
    pFont->Release();
    return nullptr;
  }
  return pFont;
}

// static
CFGAS_GEFont* CFGAS_GEFont::LoadFont(IFX_Stream* pFontStream,
                                     IFGAS_FontMgr* pFontMgr,
                                     FX_BOOL bSaveStream) {
  CFGAS_GEFont* pFont = new CFGAS_GEFont(pFontMgr);
  if (!pFont->LoadFontInternal(pFontStream, bSaveStream)) {
    pFont->Release();
    return nullptr;
  }
  return pFont;
}
#endif  // _FXM_PLATFORM_ == _FXM_PLATFORM_WINDOWS_

CFGAS_GEFont::CFGAS_GEFont(IFGAS_FontMgr* pFontMgr)
    :
#if _FXM_PLATFORM_ != _FXM_PLATFORM_WINDOWS_
      m_bUseLogFontStyle(FALSE),
      m_dwLogFontStyle(0),
#endif
      m_pFont(NULL),
      m_pFontMgr(pFontMgr),
      m_iRefCount(1),
      m_bExtFont(FALSE),
      m_pStream(NULL),
      m_pFileRead(NULL),
      m_pFontEncoding(NULL),
      m_pCharWidthMap(NULL),
      m_pRectArray(NULL),
      m_pBBoxMap(NULL),
      m_pProvider(NULL),
      m_wCharSet(0xFFFF) {
}

CFGAS_GEFont::CFGAS_GEFont(const CFGAS_GEFont& src, uint32_t dwFontStyles)
    :
#if _FXM_PLATFORM_ != _FXM_PLATFORM_WINDOWS_
      m_bUseLogFontStyle(FALSE),
      m_dwLogFontStyle(0),
#endif
      m_pFont(NULL),
      m_pFontMgr(src.m_pFontMgr),
      m_iRefCount(1),
      m_bExtFont(FALSE),
      m_pStream(NULL),
      m_pFileRead(NULL),
      m_pFontEncoding(NULL),
      m_pCharWidthMap(NULL),
      m_pRectArray(NULL),
      m_pBBoxMap(NULL),
      m_pProvider(NULL),
      m_wCharSet(0xFFFF) {
  ASSERT(src.m_pFont);
  m_pFont = new CFX_Font;
  m_pFont->LoadClone(src.m_pFont);
  CFX_SubstFont* pSubst = m_pFont->GetSubstFont();
  if (!pSubst) {
    pSubst = new CFX_SubstFont;
    m_pFont->SetSubstFont(pSubst);
  }
  pSubst->m_Weight =
      (dwFontStyles & FX_FONTSTYLE_Bold) ? FXFONT_FW_BOLD : FXFONT_FW_NORMAL;
  if (dwFontStyles & FX_FONTSTYLE_Italic) {
    pSubst->m_SubstFlags |= FXFONT_SUBST_ITALIC;
  }
  InitFont();
}

CFGAS_GEFont::~CFGAS_GEFont() {
  for (int32_t i = 0; i < m_SubstFonts.GetSize(); i++)
    m_SubstFonts[i]->Release();

  m_SubstFonts.RemoveAll();
  m_FontMapper.clear();
  if (m_pFileRead)
    m_pFileRead->Release();

  if (m_pStream)
    m_pStream->Release();

  delete m_pFontEncoding;
  delete m_pCharWidthMap;
  delete m_pRectArray;
  delete m_pBBoxMap;
  if (!m_bExtFont)
    delete m_pFont;
}

void CFGAS_GEFont::Release() {
  if (--m_iRefCount < 1) {
    if (m_pFontMgr != NULL) {
      m_pFontMgr->RemoveFont(this);
    }
    delete this;
  }
}
CFGAS_GEFont* CFGAS_GEFont::Retain() {
  ++m_iRefCount;
  return this;
}

#if _FXM_PLATFORM_ == _FXM_PLATFORM_WINDOWS_
FX_BOOL CFGAS_GEFont::LoadFontInternal(const FX_WCHAR* pszFontFamily,
                                       uint32_t dwFontStyles,
                                       uint16_t wCodePage) {
  if (m_pFont) {
    return FALSE;
  }
  CFX_ByteString csFontFamily;
  if (pszFontFamily != NULL) {
    csFontFamily = CFX_ByteString::FromUnicode(pszFontFamily);
  }
  uint32_t dwFlags = 0;
  if (dwFontStyles & FX_FONTSTYLE_FixedPitch) {
    dwFlags |= FXFONT_FIXED_PITCH;
  }
  if (dwFontStyles & FX_FONTSTYLE_Serif) {
    dwFlags |= FXFONT_SERIF;
  }
  if (dwFontStyles & FX_FONTSTYLE_Symbolic) {
    dwFlags |= FXFONT_SYMBOLIC;
  }
  if (dwFontStyles & FX_FONTSTYLE_Script) {
    dwFlags |= FXFONT_SCRIPT;
  }
  if (dwFontStyles & FX_FONTSTYLE_Italic) {
    dwFlags |= FXFONT_ITALIC;
  }
  if (dwFontStyles & FX_FONTSTYLE_Bold) {
    dwFlags |= FXFONT_BOLD;
  }
  if (dwFontStyles & FX_FONTSTYLE_ExactMatch) {
    dwFlags |= FXFONT_EXACTMATCH;
  }
  int32_t iWeight =
      (dwFontStyles & FX_FONTSTYLE_Bold) ? FXFONT_FW_BOLD : FXFONT_FW_NORMAL;
  uint16_t wCharSet = FX_GetCharsetFromCodePage(wCodePage);
  if (wCharSet == 0xFFFF) {
    wCharSet = FXSYS_GetACP();
  }
  m_wCharSet = wCharSet;
  m_pFont = new CFX_Font;
  if ((dwFlags & FXFONT_ITALIC) && (dwFlags & FXFONT_BOLD)) {
    csFontFamily += ",BoldItalic";
  } else if (dwFlags & FXFONT_BOLD) {
    csFontFamily += ",Bold";
  } else if (dwFlags & FXFONT_ITALIC) {
    csFontFamily += ",Italic";
  }
  m_pFont->LoadSubst(csFontFamily, TRUE, dwFlags, iWeight, 0, wCodePage);
  FX_BOOL bRet = m_pFont->GetFace() != nullptr;
  if (bRet) {
    bRet = InitFont();
  }
  return bRet;
}

FX_BOOL CFGAS_GEFont::LoadFontInternal(const uint8_t* pBuffer, int32_t length) {
  if (m_pFont) {
    return FALSE;
  }
  m_pFont = new CFX_Font;
  FX_BOOL bRet = m_pFont->LoadEmbedded(pBuffer, length);
  if (bRet) {
    bRet = InitFont();
  }
  m_wCharSet = 0xFFFF;
  return bRet;
}

FX_BOOL CFGAS_GEFont::LoadFontInternal(IFX_Stream* pFontStream,
                                       FX_BOOL bSaveStream) {
  if (m_pFont || m_pFileRead || !pFontStream || pFontStream->GetLength() < 1) {
    return FALSE;
  }
  if (bSaveStream) {
    m_pStream = pFontStream;
  }
  m_pFileRead = FX_CreateFileRead(pFontStream);
  m_pFont = new CFX_Font;
  FX_BOOL bRet = m_pFont->LoadFile(m_pFileRead);
  if (bRet) {
    bRet = InitFont();
  } else {
    m_pFileRead->Release();
    m_pFileRead = nullptr;
  }
  m_wCharSet = 0xFFFF;
  return bRet;
}
#endif  // _FXM_PLATFORM_ == _FXM_PLATFORM_WINDOWS_

FX_BOOL CFGAS_GEFont::LoadFontInternal(CFX_Font* pExtFont) {
  if (m_pFont || !pExtFont) {
    return FALSE;
  }
  m_pFont = pExtFont;
  m_bExtFont = TRUE;
  m_wCharSet = 0xFFFF;
  return InitFont();
}

FX_BOOL CFGAS_GEFont::InitFont() {
  if (!m_pFont)
    return FALSE;
  if (!m_pFontEncoding) {
    m_pFontEncoding = FX_CreateFontEncodingEx(m_pFont);
    if (!m_pFontEncoding)
      return FALSE;
  }
  if (!m_pCharWidthMap)
    m_pCharWidthMap = new CFX_WordDiscreteArray(1024);
  if (!m_pRectArray)
    m_pRectArray = new CFX_MassArrayTemplate<CFX_Rect>(16);
  if (!m_pBBoxMap)
    m_pBBoxMap = new CFX_MapPtrToPtr(16);

  return TRUE;
}
CFGAS_GEFont* CFGAS_GEFont::Derive(uint32_t dwFontStyles, uint16_t wCodePage) {
  if (GetFontStyles() == dwFontStyles) {
    return Retain();
  }
  return new CFGAS_GEFont(*this, dwFontStyles);
}
uint8_t CFGAS_GEFont::GetCharSet() const {
  if (m_wCharSet != 0xFFFF) {
    return (uint8_t)m_wCharSet;
  }
  if (!m_pFont->GetSubstFont()) {
    return FX_CHARSET_Default;
  }
  return m_pFont->GetSubstFont()->m_Charset;
}
void CFGAS_GEFont::GetFamilyName(CFX_WideString& wsFamily) const {
  if (!m_pFont->GetSubstFont() ||
      m_pFont->GetSubstFont()->m_Family.GetLength() == 0) {
    wsFamily = CFX_WideString::FromLocal(m_pFont->GetFamilyName().AsStringC());
  } else {
    wsFamily = CFX_WideString::FromLocal(
        m_pFont->GetSubstFont()->m_Family.AsStringC());
  }
}

uint32_t CFGAS_GEFont::GetFontStyles() const {
  ASSERT(m_pFont != NULL);
#if _FXM_PLATFORM_ != _FXM_PLATFORM_WINDOWS_
  if (m_bUseLogFontStyle) {
    return m_dwLogFontStyle;
  }
#endif
  uint32_t dwStyles = 0;
  if (!m_pFont->GetSubstFont()) {
    if (m_pFont->IsBold()) {
      dwStyles |= FX_FONTSTYLE_Bold;
    }
    if (m_pFont->IsItalic()) {
      dwStyles |= FX_FONTSTYLE_Italic;
    }
  } else {
    if (m_pFont->GetSubstFont()->m_Weight == FXFONT_FW_BOLD) {
      dwStyles |= FX_FONTSTYLE_Bold;
    }
    if (m_pFont->GetSubstFont()->m_SubstFlags & FXFONT_SUBST_ITALIC) {
      dwStyles |= FX_FONTSTYLE_Italic;
    }
  }
  return dwStyles;
}
FX_BOOL CFGAS_GEFont::GetCharWidth(FX_WCHAR wUnicode,
                                   int32_t& iWidth,
                                   FX_BOOL bCharCode) {
  return GetCharWidthInternal(wUnicode, iWidth, TRUE, bCharCode);
}
FX_BOOL CFGAS_GEFont::GetCharWidthInternal(FX_WCHAR wUnicode,
                                           int32_t& iWidth,
                                           FX_BOOL bRecursive,
                                           FX_BOOL bCharCode) {
  ASSERT(m_pCharWidthMap != NULL);
  iWidth = m_pCharWidthMap->GetAt(wUnicode, 0);
  if (iWidth < 1) {
    if (!m_pProvider ||
        !m_pProvider->GetCharWidth(this, wUnicode, iWidth, bCharCode)) {
      CFGAS_GEFont* pFont = NULL;
      int32_t iGlyph = GetGlyphIndex(wUnicode, TRUE, &pFont, bCharCode);
      if (iGlyph != 0xFFFF && pFont != NULL) {
        if (pFont == this) {
          iWidth = m_pFont->GetGlyphWidth(iGlyph);
          if (iWidth < 0) {
            iWidth = -1;
          }
        } else if (pFont->GetCharWidthInternal(wUnicode, iWidth, FALSE,
                                               bCharCode)) {
          return TRUE;
        }
      } else {
        iWidth = -1;
      }
    }
    m_pCharWidthMap->SetAtGrow(wUnicode, (int16_t)iWidth);
  } else if (iWidth == 65535) {
    iWidth = -1;
  }
  return iWidth > 0;
}
FX_BOOL CFGAS_GEFont::GetCharBBox(FX_WCHAR wUnicode,
                                  CFX_Rect& bbox,
                                  FX_BOOL bCharCode) {
  return GetCharBBoxInternal(wUnicode, bbox, TRUE, bCharCode);
}
FX_BOOL CFGAS_GEFont::GetCharBBoxInternal(FX_WCHAR wUnicode,
                                          CFX_Rect& bbox,
                                          FX_BOOL bRecursive,
                                          FX_BOOL bCharCode) {
  ASSERT(m_pRectArray != NULL);
  ASSERT(m_pBBoxMap != NULL);
  void* pRect = NULL;
  if (!m_pBBoxMap->Lookup((void*)(uintptr_t)wUnicode, pRect)) {
    CFGAS_GEFont* pFont = NULL;
    int32_t iGlyph = GetGlyphIndex(wUnicode, TRUE, &pFont, bCharCode);
    if (iGlyph != 0xFFFF && pFont != NULL) {
      if (pFont == this) {
        FX_RECT rtBBox;
        if (m_pFont->GetGlyphBBox(iGlyph, rtBBox)) {
          CFX_Rect rt;
          rt.Set(rtBBox.left, rtBBox.top, rtBBox.Width(), rtBBox.Height());
          int32_t index = m_pRectArray->Add(rt);
          pRect = m_pRectArray->GetPtrAt(index);
          m_pBBoxMap->SetAt((void*)(uintptr_t)wUnicode, pRect);
        }
      } else if (pFont->GetCharBBoxInternal(wUnicode, bbox, FALSE, bCharCode)) {
        return TRUE;
      }
    }
  }
  if (!pRect)
    return FALSE;

  bbox = *static_cast<const CFX_Rect*>(pRect);
  return TRUE;
}
FX_BOOL CFGAS_GEFont::GetBBox(CFX_Rect& bbox) {
  FX_RECT rt(0, 0, 0, 0);
  FX_BOOL bRet = m_pFont->GetBBox(rt);
  if (bRet) {
    bbox.left = rt.left;
    bbox.width = rt.Width();
    bbox.top = rt.bottom;
    bbox.height = -rt.Height();
  }
  return bRet;
}
int32_t CFGAS_GEFont::GetItalicAngle() const {
  if (!m_pFont->GetSubstFont()) {
    return 0;
  }
  return m_pFont->GetSubstFont()->m_ItalicAngle;
}
int32_t CFGAS_GEFont::GetGlyphIndex(FX_WCHAR wUnicode, FX_BOOL bCharCode) {
  return GetGlyphIndex(wUnicode, TRUE, NULL, bCharCode);
}
int32_t CFGAS_GEFont::GetGlyphIndex(FX_WCHAR wUnicode,
                                    FX_BOOL bRecursive,
                                    CFGAS_GEFont** ppFont,
                                    FX_BOOL bCharCode) {
  ASSERT(m_pFontEncoding != NULL);
  int32_t iGlyphIndex = m_pFontEncoding->GlyphFromCharCode(wUnicode);
  if (iGlyphIndex > 0) {
    if (ppFont != NULL) {
      *ppFont = this;
    }
    return iGlyphIndex;
  }
  const FGAS_FONTUSB* pFontUSB = FGAS_GetUnicodeBitField(wUnicode);
  if (pFontUSB == NULL) {
    return 0xFFFF;
  }
  uint16_t wBitField = pFontUSB->wBitField;
  if (wBitField >= 128) {
    return 0xFFFF;
  }
  auto it = m_FontMapper.find(wUnicode);
  CFGAS_GEFont* pFont = it != m_FontMapper.end() ? it->second : nullptr;
  if (pFont && pFont != this) {
    iGlyphIndex = pFont->GetGlyphIndex(wUnicode, FALSE, NULL, bCharCode);
    if (iGlyphIndex != 0xFFFF) {
      int32_t i = m_SubstFonts.Find(pFont);
      if (i > -1) {
        iGlyphIndex |= ((i + 1) << 24);
        if (ppFont)
          *ppFont = pFont;
        return iGlyphIndex;
      }
    }
  }
  if (m_pFontMgr && bRecursive) {
    CFX_WideString wsFamily;
    GetFamilyName(wsFamily);
#if _FXM_PLATFORM_ == _FXM_PLATFORM_WINDOWS_
    CFGAS_GEFont* pFont = m_pFontMgr->GetDefFontByUnicode(
        wUnicode, GetFontStyles(), wsFamily.c_str());
#else
    CFGAS_GEFont* pFont = m_pFontMgr->GetFontByUnicode(
        wUnicode, GetFontStyles(), wsFamily.c_str());
    if (!pFont)
      pFont = m_pFontMgr->GetFontByUnicode(wUnicode, GetFontStyles(), NULL);
#endif
    if (pFont) {
      if (pFont == this) {
        pFont->Release();
        return 0xFFFF;
      }
      m_FontMapper[wUnicode] = pFont;
      int32_t i = m_SubstFonts.GetSize();
      m_SubstFonts.Add(pFont);
      iGlyphIndex = pFont->GetGlyphIndex(wUnicode, FALSE, NULL, bCharCode);
      if (iGlyphIndex != 0xFFFF) {
        iGlyphIndex |= ((i + 1) << 24);
        if (ppFont)
          *ppFont = pFont;
        return iGlyphIndex;
      }
    }
  }
  return 0xFFFF;
}
int32_t CFGAS_GEFont::GetAscent() const {
  return m_pFont->GetAscent();
}
int32_t CFGAS_GEFont::GetDescent() const {
  return m_pFont->GetDescent();
}
void CFGAS_GEFont::Reset() {
  for (int32_t i = 0; i < m_SubstFonts.GetSize(); i++)
    m_SubstFonts[i]->Reset();
  if (m_pCharWidthMap != NULL) {
    m_pCharWidthMap->RemoveAll();
  }
  if (m_pBBoxMap != NULL) {
    m_pBBoxMap->RemoveAll();
  }
  if (m_pRectArray != NULL) {
    m_pRectArray->RemoveAll();
  }
}
CFGAS_GEFont* CFGAS_GEFont::GetSubstFont(int32_t iGlyphIndex) const {
  iGlyphIndex = ((uint32_t)iGlyphIndex) >> 24;
  return iGlyphIndex == 0 ? const_cast<CFGAS_GEFont*>(this)
                          : m_SubstFonts[iGlyphIndex - 1];
}