// 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 "../../include/pdfwindow/PDFWindow.h"
#include "../../include/pdfwindow/PWL_Wnd.h"
#include "../../include/pdfwindow/PWL_FontMap.h"

#define DEFAULT_FONT_NAME           "Helvetica"

/* ------------------------------ CPWL_FontMap ------------------------------ */

CPWL_FontMap::CPWL_FontMap(IFX_SystemHandler* pSystemHandler) :
    m_pPDFDoc(NULL),
    m_pSystemHandler(pSystemHandler)
{
    ASSERT(m_pSystemHandler != NULL);
}

CPWL_FontMap::~CPWL_FontMap()
{
    delete m_pPDFDoc;
    m_pPDFDoc = NULL;

    Empty();
}

void CPWL_FontMap::SetSystemHandler(IFX_SystemHandler* pSystemHandler)
{
    m_pSystemHandler = pSystemHandler;
}

CPDF_Document* CPWL_FontMap::GetDocument()
{
    if (!m_pPDFDoc)
    {
        if (CPDF_ModuleMgr::Get())
        {
            m_pPDFDoc = new CPDF_Document;
            m_pPDFDoc->CreateNewDoc();
        }
    }

    return m_pPDFDoc;
}

CPDF_Font* CPWL_FontMap::GetPDFFont(int32_t nFontIndex)
{
    if (nFontIndex >=0 && nFontIndex < m_aData.GetSize())
    {
        if (CPWL_FontMap_Data* pData = m_aData.GetAt(nFontIndex))
        {
            return pData->pFont;
        }
    }

    return NULL;
}

CFX_ByteString CPWL_FontMap::GetPDFFontAlias(int32_t nFontIndex)
{
    if (nFontIndex >=0 && nFontIndex < m_aData.GetSize())
    {
        if (CPWL_FontMap_Data* pData = m_aData.GetAt(nFontIndex))
        {
            return pData->sFontName;
        }
    }

    return "";
}

bool CPWL_FontMap::KnowWord(int32_t nFontIndex, FX_WORD word)
{
    if (nFontIndex >=0 && nFontIndex < m_aData.GetSize())
    {
        if (m_aData.GetAt(nFontIndex))
        {
            return CharCodeFromUnicode(nFontIndex, word) >= 0;
        }
    }

    return false;
}

int32_t CPWL_FontMap::GetWordFontIndex(FX_WORD word, int32_t nCharset, int32_t nFontIndex)
{
    if (nFontIndex > 0)
    {
        if (KnowWord(nFontIndex, word))
            return nFontIndex;
    }
    else
    {
        if (const CPWL_FontMap_Data* pData = GetFontMapData(0))
        {
            if (nCharset == DEFAULT_CHARSET ||
                pData->nCharset == SYMBOL_CHARSET ||
                nCharset == pData->nCharset)
            {
                if (KnowWord(0, word))
                    return 0;
            }
        }
    }

    int32_t nNewFontIndex = GetFontIndex(GetNativeFontName(nCharset), nCharset, true);
    if (nNewFontIndex >= 0)
    {
        if (KnowWord(nNewFontIndex, word))
            return nNewFontIndex;
    }
    nNewFontIndex = GetFontIndex("Arial Unicode MS", DEFAULT_CHARSET, false);
    if (nNewFontIndex >= 0)
    {
        if (KnowWord(nNewFontIndex, word))
            return nNewFontIndex;
    }
    return -1;
}

int32_t CPWL_FontMap::CharCodeFromUnicode(int32_t nFontIndex, FX_WORD word)
{
    if (CPWL_FontMap_Data* pData = m_aData.GetAt(nFontIndex))
    {
        if (pData->pFont)
        {
            if (pData->pFont->IsUnicodeCompatible())
            {
                int nCharCode = pData->pFont->CharCodeFromUnicode(word);
                pData->pFont->GlyphFromCharCode(nCharCode);
                return nCharCode;
            }
            if (word < 0xFF)
                return word;
        }
    }
    return -1;
}

CFX_ByteString CPWL_FontMap::GetNativeFontName(int32_t nCharset)
{
    //searching native font is slow, so we must save time
    for (int32_t i=0,sz=m_aNativeFont.GetSize(); i<sz; i++)
    {
        if (CPWL_FontMap_Native* pData = m_aNativeFont.GetAt(i))
        {
            if (pData->nCharset == nCharset)
                return pData->sFontName;
        }
    }

    CFX_ByteString sNew = GetNativeFont(nCharset);

    if (!sNew.IsEmpty())
    {
        CPWL_FontMap_Native* pNewData = new CPWL_FontMap_Native;
        pNewData->nCharset = nCharset;
        pNewData->sFontName = sNew;

        m_aNativeFont.Add(pNewData);
    }

    return sNew;
}

void CPWL_FontMap::Empty()
{
    {
        for (int32_t i=0, sz=m_aData.GetSize(); i<sz; i++)
            delete m_aData.GetAt(i);

        m_aData.RemoveAll();
    }
    {
        for (int32_t i=0, sz=m_aNativeFont.GetSize(); i<sz; i++)
            delete m_aNativeFont.GetAt(i);

        m_aNativeFont.RemoveAll();
    }
}

void CPWL_FontMap::Initial(const FX_CHAR* fontname)
{
    CFX_ByteString sFontName = fontname;

    if (sFontName.IsEmpty())
        sFontName = DEFAULT_FONT_NAME;

    GetFontIndex(sFontName, ANSI_CHARSET, false);
}


/*
List of currently supported standard fonts:
Courier, Courier-Bold, Courier-BoldOblique, Courier-Oblique
Helvetica, Helvetica-Bold, Helvetica-BoldOblique, Helvetica-Oblique
Times-Roman, Times-Bold, Times-Italic, Times-BoldItalic
Symbol, ZapfDingbats
*/

const char* g_sDEStandardFontName[] = {"Courier", "Courier-Bold", "Courier-BoldOblique", "Courier-Oblique",
    "Helvetica", "Helvetica-Bold", "Helvetica-BoldOblique", "Helvetica-Oblique",
    "Times-Roman", "Times-Bold", "Times-Italic", "Times-BoldItalic",
    "Symbol", "ZapfDingbats"};

bool CPWL_FontMap::IsStandardFont(const CFX_ByteString& sFontName)
{
    for (int32_t i=0; i<14; i++)
    {
        if (sFontName == g_sDEStandardFontName[i])
            return true;
    }

    return false;
}

int32_t CPWL_FontMap::FindFont(const CFX_ByteString& sFontName, int32_t nCharset)
{
    for (int32_t i=0,sz=m_aData.GetSize(); i<sz; i++)
    {
        if (CPWL_FontMap_Data* pData = m_aData.GetAt(i))
        {
            if (nCharset == DEFAULT_CHARSET || nCharset == pData->nCharset)
            {
                if (sFontName.IsEmpty() || pData->sFontName == sFontName)
                    return i;
            }
        }
    }

    return -1;
}

int32_t CPWL_FontMap::GetFontIndex(const CFX_ByteString& sFontName, int32_t nCharset, bool bFind)
{
    int32_t nFontIndex = FindFont(EncodeFontAlias(sFontName, nCharset), nCharset);
    if (nFontIndex >= 0)
        return nFontIndex;

    CFX_ByteString sAlias;
    CPDF_Font* pFont = NULL;
    if (bFind)
        pFont = FindFontSameCharset(sAlias, nCharset);

    if (!pFont)
    {
        CFX_ByteString sTemp = sFontName;
        pFont = AddFontToDocument(GetDocument(), sTemp, nCharset);
        sAlias = EncodeFontAlias(sTemp, nCharset);
    }
    AddedFont(pFont, sAlias);
    return AddFontData(pFont, sAlias, nCharset);
}

int32_t CPWL_FontMap::GetPWLFontIndex(FX_WORD word, int32_t nCharset)
{
    int32_t nFind = -1;

    for (int32_t i=0,sz=m_aData.GetSize(); i<sz; i++)
    {
        if (CPWL_FontMap_Data* pData = m_aData.GetAt(i))
        {
            if (pData->nCharset == nCharset)
            {
                nFind = i;
                break;
            }
        }
    }

    CPDF_Font* pNewFont = GetPDFFont(nFind);

    if (!pNewFont) return -1;

    /*
    if (CPDF_Font* pFont = GetPDFFont(nFind))
    {
        PWLFont.AddWordToFontDict(pFontDict, word);
    }
    */

    CFX_ByteString sAlias = EncodeFontAlias("Arial_Chrome", nCharset);
    AddedFont(pNewFont, sAlias);

    return AddFontData(pNewFont, sAlias, nCharset);
}

CPDF_Font* CPWL_FontMap::FindFontSameCharset(CFX_ByteString& sFontAlias, int32_t nCharset)
{
    return NULL;
}

int32_t CPWL_FontMap::AddFontData(CPDF_Font* pFont, const CFX_ByteString& sFontAlias, int32_t nCharset)
{
    CPWL_FontMap_Data* pNewData = new CPWL_FontMap_Data;
    pNewData->pFont = pFont;
    pNewData->sFontName = sFontAlias;
    pNewData->nCharset = nCharset;

    m_aData.Add(pNewData);

    return m_aData.GetSize() -1;
}

void CPWL_FontMap::AddedFont(CPDF_Font* pFont, const CFX_ByteString& sFontAlias)
{
}

CFX_ByteString CPWL_FontMap::GetFontName(int32_t nFontIndex)
{
    if (nFontIndex >=0 && nFontIndex < m_aData.GetSize())
    {
        if (CPWL_FontMap_Data* pData = m_aData.GetAt(nFontIndex))
        {
            return pData->sFontName;
        }
    }

    return "";
}

CFX_ByteString CPWL_FontMap::GetNativeFont(int32_t nCharset)
{

    if (nCharset == DEFAULT_CHARSET)
        nCharset = GetNativeCharset();

    CFX_ByteString sFontName = GetDefaultFontByCharset(nCharset);
    if (m_pSystemHandler)
    {
        if (m_pSystemHandler->FindNativeTrueTypeFont(nCharset, sFontName))
            return sFontName;

        sFontName = m_pSystemHandler->GetNativeTrueTypeFont(nCharset);
    }
    return sFontName;
}

CPDF_Font* CPWL_FontMap::AddFontToDocument(CPDF_Document* pDoc, CFX_ByteString& sFontName, uint8_t nCharset)
{
    if (IsStandardFont(sFontName))
        return AddStandardFont(pDoc, sFontName);

    return AddSystemFont(pDoc, sFontName, nCharset);
}

CPDF_Font* CPWL_FontMap::AddStandardFont(CPDF_Document* pDoc, CFX_ByteString& sFontName)
{
    if (!pDoc) return NULL;

    CPDF_Font* pFont = NULL;

    if (sFontName == "ZapfDingbats")
        pFont = pDoc->AddStandardFont(sFontName, NULL);
    else
    {
        CPDF_FontEncoding fe(PDFFONT_ENCODING_WINANSI);
        pFont = pDoc->AddStandardFont(sFontName, &fe);
    }

    return pFont;
}

CPDF_Font* CPWL_FontMap::AddSystemFont(CPDF_Document* pDoc, CFX_ByteString& sFontName, uint8_t nCharset)
{
    if (!pDoc) return NULL;

    if (sFontName.IsEmpty()) sFontName = GetNativeFont(nCharset);
    if (nCharset == DEFAULT_CHARSET) nCharset = GetNativeCharset();

    if (m_pSystemHandler)
        return m_pSystemHandler->AddNativeTrueTypeFontToPDF(pDoc, sFontName, nCharset);

    return NULL;
}

CFX_ByteString CPWL_FontMap::EncodeFontAlias(const CFX_ByteString& sFontName, int32_t nCharset)
{
    CFX_ByteString sPostfix;
    sPostfix.Format("_%02X", nCharset);
    return EncodeFontAlias(sFontName) + sPostfix;
}

CFX_ByteString CPWL_FontMap::EncodeFontAlias(const CFX_ByteString& sFontName)
{
    CFX_ByteString sRet = sFontName;
    sRet.Remove(' ');
    return sRet;
}

int32_t CPWL_FontMap::GetFontMapCount() const
{
    return m_aData.GetSize();
}

const CPWL_FontMap_Data* CPWL_FontMap::GetFontMapData(int32_t nIndex) const
{
    if (nIndex >=0 && nIndex < m_aData.GetSize())
    {
        return m_aData.GetAt(nIndex);
    }

    return NULL;
}

int32_t CPWL_FontMap::GetNativeCharset()
{
    uint8_t nCharset = ANSI_CHARSET;
    int32_t iCodePage = FXSYS_GetACP();
    switch (iCodePage)
    {
    case 932://Japan
        nCharset = SHIFTJIS_CHARSET;
        break;
    case 936://Chinese (PRC, Singapore)
        nCharset = GB2312_CHARSET;
        break;
    case 950://Chinese (Taiwan; Hong Kong SAR, PRC)
        nCharset = GB2312_CHARSET;
        break;
    case 1252://Windows 3.1 Latin 1 (US, Western Europe)
        nCharset = ANSI_CHARSET;
        break;
    case 874://Thai
        nCharset = THAI_CHARSET;
        break;
    case 949://Korean
        nCharset = HANGUL_CHARSET;
        break;
    case 1200://Unicode (BMP of ISO 10646)
        nCharset = ANSI_CHARSET;
        break;
    case 1250://Windows 3.1 Eastern European
        nCharset = EASTEUROPE_CHARSET;
        break;
    case 1251://Windows 3.1 Cyrillic
        nCharset = RUSSIAN_CHARSET;
        break;
    case 1253://Windows 3.1 Greek
        nCharset = GREEK_CHARSET;
        break;
    case 1254://Windows 3.1 Turkish
        nCharset = TURKISH_CHARSET;
        break;
    case 1255://Hebrew
        nCharset = HEBREW_CHARSET;
        break;
    case 1256://Arabic
        nCharset = ARABIC_CHARSET;
        break;
    case 1257://Baltic
        nCharset = BALTIC_CHARSET;
        break;
    case 1258://Vietnamese
        nCharset = VIETNAMESE_CHARSET;
        break;
    case 1361://Korean(Johab)
        nCharset = JOHAB_CHARSET;
        break;
    }
    return nCharset;
}

const CPWL_FontMap::CharsetFontMap CPWL_FontMap::defaultTTFMap[] = {
    { ANSI_CHARSET, "Helvetica" },
    { GB2312_CHARSET, "SimSun" },
    { CHINESEBIG5_CHARSET, "MingLiU" },
    { SHIFTJIS_CHARSET, "MS Gothic" },
    { HANGUL_CHARSET, "Batang" },
    { RUSSIAN_CHARSET, "Arial" },
#if _FXM_PLATFORM_ == _FXM_PLATFORM_LINUX_ || _FXM_PLATFORM_ == _FXM_PLATFORM_APPLE_
    { EASTEUROPE_CHARSET, "Arial" },
#else
    { EASTEUROPE_CHARSET, "Tahoma" },
#endif
    { ARABIC_CHARSET, "Arial" },
    { -1, NULL }
};

CFX_ByteString CPWL_FontMap::GetDefaultFontByCharset(int32_t nCharset)
{
    int i = 0;
    while (defaultTTFMap[i].charset != -1) {
        if (nCharset == defaultTTFMap[i].charset)
            return defaultTTFMap[i].fontname;
        ++i;
    }
    return "";
}

int32_t CPWL_FontMap::CharSetFromUnicode(FX_WORD word, int32_t nOldCharset)
{
    if(m_pSystemHandler && (-1 != m_pSystemHandler->GetCharSet()))
        return m_pSystemHandler->GetCharSet();
    //to avoid CJK Font to show ASCII
    if (word < 0x7F) return ANSI_CHARSET;
    //follow the old charset
    if (nOldCharset != DEFAULT_CHARSET) return nOldCharset;

    //find new charset
    if ((word >= 0x4E00 && word <= 0x9FA5) ||
        (word >= 0xE7C7 && word <= 0xE7F3) ||
        (word >= 0x3000 && word <= 0x303F) ||
        (word >= 0x2000 && word <= 0x206F))
    {
        return GB2312_CHARSET;
    }

    if (((word >= 0x3040) && (word <= 0x309F)) ||
        ((word >= 0x30A0) && (word <= 0x30FF)) ||
        ((word >= 0x31F0) && (word <= 0x31FF)) ||
        ((word >= 0xFF00) && (word <= 0xFFEF)) )
    {
        return SHIFTJIS_CHARSET;
    }

    if (((word >= 0xAC00) && (word <= 0xD7AF)) ||
        ((word >= 0x1100) && (word <= 0x11FF)) ||
        ((word >= 0x3130) && (word <= 0x318F)))
    {
        return HANGUL_CHARSET;
    }

    if (word >= 0x0E00 && word <= 0x0E7F)
        return THAI_CHARSET;

    if ((word >= 0x0370 && word <= 0x03FF) ||
        (word >= 0x1F00 && word <= 0x1FFF))
        return GREEK_CHARSET;

    if ((word >= 0x0600 && word <= 0x06FF) ||
        (word >= 0xFB50 && word <= 0xFEFC))
        return ARABIC_CHARSET;

    if (word >= 0x0590 && word <= 0x05FF)
        return HEBREW_CHARSET;

    if (word >= 0x0400 && word <= 0x04FF)
        return RUSSIAN_CHARSET;

    if (word >= 0x0100 && word <= 0x024F)
        return EASTEUROPE_CHARSET;

    if (word >= 0x1E00 && word <= 0x1EFF)
        return VIETNAMESE_CHARSET;

    return ANSI_CHARSET;
}

/* ------------------------ CPWL_DocFontMap ------------------------ */

CPWL_DocFontMap::CPWL_DocFontMap(IFX_SystemHandler* pSystemHandler, CPDF_Document* pAttachedDoc)
    : CPWL_FontMap(pSystemHandler),
    m_pAttachedDoc(pAttachedDoc)
{
}

CPWL_DocFontMap::~CPWL_DocFontMap()
{
}

CPDF_Document* CPWL_DocFontMap::GetDocument()
{
    return m_pAttachedDoc;
}