/****************************************************************************\
 Part of the XeTeX typesetting system
 Copyright (c) 1994-2008 by SIL International
 Copyright (c) 2009, 2011 by Jonathan Kew

 SIL Author(s): Jonathan Kew

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\****************************************************************************/

#include "tectonic_bridge_core.h"

#include "xetex-XeTeXFontMgr_FC.h"

/* allow compilation with old Fontconfig header */
#ifndef FC_FULLNAME
#define FC_FULLNAME "fullname"
#endif

#include <ft2build.h>
#include FT_SFNT_NAMES_H
#include FT_TRUETYPE_IDS_H

#include <unicode/ucnv.h>

#define kFontFamilyName 1
#define kFontStyleName  2
#define kFontFullName   4
#define kPreferredFamilyName    16
#define kPreferredSubfamilyName 17

extern FT_Library gFreeTypeLibrary;

static UConverter* macRomanConv = NULL;
static UConverter* utf16beConv = NULL;
static UConverter* utf8Conv = NULL;

static char*
convertToUtf8(UConverter* conv, const unsigned char* name, int len)
{
    char* buffer1 = NULL;
    char* buffer2 = NULL;
    int bufSize = -1;

    if (2 * (len + 1) > bufSize) {
        if (buffer1 != NULL) {
            delete[] buffer1;
            delete[] buffer2;
        }
        bufSize = 2 * len + 100;
        buffer1 = new char[bufSize];
        buffer2 = new char[bufSize];
    }

    UErrorCode status = U_ZERO_ERROR;
    len = ucnv_toUChars(conv, (UChar*)buffer1, bufSize, (const char*)name, len, &status);
    len = ucnv_fromUChars(utf8Conv, buffer2, bufSize, (UChar*)buffer1, len, &status);
    buffer2[len] = 0;

    delete[] buffer1;
    return buffer2;
}

XeTeXFontMgr::NameCollection*
XeTeXFontMgr_FC::readNames(FcPattern* pat)
{
    NameCollection* names = new NameCollection;

    char* pathname;
    if (FcPatternGetString(pat, FC_FILE, 0, (FcChar8**)&pathname) != FcResultMatch)
        return names;
    int index;
    if (FcPatternGetInteger(pat, FC_INDEX, 0, &index) != FcResultMatch)
        return names;

    FT_Face face;
    if (FT_New_Face(gFreeTypeLibrary, pathname, index, &face) != 0)
        return names;

    const char* name = FT_Get_Postscript_Name(face);
    if (name == NULL)
        return names;
    names->m_psName = name;

    // for sfnt containers, we'll read the name table ourselves, not rely on Fontconfig
    if (FT_IS_SFNT(face)) {
        unsigned int i;
        std::list<std::string>  familyNames;
        std::list<std::string>  subFamilyNames;
        FT_SfntName nameRec;
        for (i = 0; i < FT_Get_Sfnt_Name_Count(face); ++i) {
            char* utf8name = NULL;
            if (FT_Get_Sfnt_Name(face, i, &nameRec) != 0)
                continue;
            switch (nameRec.name_id) {
                case kFontFullName:
                case kFontFamilyName:
                case kFontStyleName:
                case kPreferredFamilyName:
                case kPreferredSubfamilyName:
                    {
                        bool preferredName = false;
                        /* Tectonic: macRomanConv may not be available; see comment below */
                        if (macRomanConv != NULL && nameRec.platform_id == TT_PLATFORM_MACINTOSH
                                && nameRec.encoding_id == TT_MAC_ID_ROMAN && nameRec.language_id == 0) {
                            utf8name = convertToUtf8(macRomanConv, nameRec.string, nameRec.string_len);
                            preferredName = true;
                        }
                        else if ((nameRec.platform_id == TT_PLATFORM_APPLE_UNICODE)
                                || (nameRec.platform_id == TT_PLATFORM_MICROSOFT))
                            utf8name = convertToUtf8(utf16beConv, nameRec.string, nameRec.string_len);

                        if (utf8name != NULL) {
                            std::list<std::string>* nameList = NULL;
                            switch (nameRec.name_id) {
                                case kFontFullName:
                                    nameList = &names->m_fullNames;
                                    break;
                                case kFontFamilyName:
                                    nameList = &names->m_familyNames;
                                    break;
                                case kFontStyleName:
                                    nameList = &names->m_styleNames;
                                    break;
                                case kPreferredFamilyName:
                                    nameList = &familyNames;
                                    break;
                                case kPreferredSubfamilyName:
                                    nameList = &subFamilyNames;
                                    break;
                            }
                            if (preferredName)
                                prependToList(nameList, utf8name);
                            else
                                appendToList(nameList, utf8name);
                            delete[] utf8name;
                        }
                    }
                    break;
            }
        }
        if (familyNames.size() > 0)
            names->m_familyNames = familyNames;
        if (subFamilyNames.size() > 0)
            names->m_styleNames = subFamilyNames;
    } else {
        index = 0;
        while (FcPatternGetString(pat, FC_FULLNAME, index++, (FcChar8**)&name) == FcResultMatch)
            appendToList(&names->m_fullNames, name);
        index = 0;
        while (FcPatternGetString(pat, FC_FAMILY, index++, (FcChar8**)&name) == FcResultMatch)
            appendToList(&names->m_familyNames, name);
        index = 0;
        while (FcPatternGetString(pat, FC_STYLE, index++, (FcChar8**)&name) == FcResultMatch)
            appendToList(&names->m_styleNames, name);

        if (names->m_fullNames.size() == 0) {
            std::string fullName(names->m_familyNames.front());
            if (names->m_styleNames.size() > 0) {
                fullName += " ";
                fullName += names->m_styleNames.front();
            }
            names->m_fullNames.push_back(fullName);
        }
    }

    FT_Done_Face(face);

    return names;
}

void
XeTeXFontMgr_FC::getOpSizeRecAndStyleFlags(Font* theFont)
{
    XeTeXFontMgr::getOpSizeRecAndStyleFlags(theFont);

    if (theFont->weight == 0 && theFont->width == 0) {
        // try to get values from FontConfig, as it apparently wasn't an sfnt
        FcPattern* pat = theFont->fontRef;
        int value;
        if (FcPatternGetInteger(pat, FC_WEIGHT, 0, &value) == FcResultMatch)
            theFont->weight = value;
        if (FcPatternGetInteger(pat, FC_WIDTH, 0, &value) == FcResultMatch)
            theFont->width = value;
        if (FcPatternGetInteger(pat, FC_SLANT, 0, &value) == FcResultMatch)
            theFont->slant = value;
    }
}

void
XeTeXFontMgr_FC::cacheFamilyMembers(const std::list<std::string>& familyNames)
{
    if (familyNames.size() == 0)
        return;
    for (int f = 0; f < allFonts->nfont; ++f) {
        FcPattern* pat = allFonts->fonts[f];
        if (m_platformRefToFont.find(pat) != m_platformRefToFont.end())
            continue;
        char* s;
        for (int i = 0; FcPatternGetString(pat, FC_FAMILY, i, (FcChar8**)&s) == FcResultMatch; ++i) {
            for (std::list<std::string>::const_iterator j = familyNames.begin(); j != familyNames.end(); ++j) {
                if (*j == s) {
                    NameCollection* names = readNames(pat);
                    addToMaps(pat, names);
                    delete names;
                    goto cached;
                }
            }
        }
    cached:
        ;
    }
}

void
XeTeXFontMgr_FC::searchForHostPlatformFonts(const std::string& name)
{
    if (cachedAll) // we've already loaded everything on an earlier search
        return;

    std::string famName;
    int hyph = name.find('-');
    if (hyph > 0 && hyph < (int) (name.length() - 1))
        famName.assign(name.begin(), name.begin() + hyph);
    else
        hyph = 0;

    bool found = false;
    while (1) {
        for (int f = 0; f < allFonts->nfont; ++f) {
            FcPattern* pat = allFonts->fonts[f];
            if (m_platformRefToFont.find(pat) != m_platformRefToFont.end())
                continue;

            if (cachedAll) {
                // failed to find it via FC; add everything to our maps (potentially slow) as a last resort
                NameCollection* names = readNames(pat);
                addToMaps(pat, names);
                delete names;
                continue;
            }

            char* s;
            int i;
            for (i = 0; FcPatternGetString(pat, FC_FULLNAME, i, (FcChar8**)&s) == FcResultMatch; ++i) {
                if (name == s) {
                    NameCollection* names = readNames(pat);
                    addToMaps(pat, names);
                    cacheFamilyMembers(names->m_familyNames);
                    delete names;
                    found = true;
                    goto next_font;
                }
            }

            for (i = 0; FcPatternGetString(pat, FC_FAMILY, i, (FcChar8**)&s) == FcResultMatch; ++i) {
                if (name == s || (hyph && famName == s)) {
                    NameCollection* names = readNames(pat);
                    addToMaps(pat, names);
                    cacheFamilyMembers(names->m_familyNames);
                    delete names;
                    found = true;
                    goto next_font;
                }
                char* t;
                for (int j = 0; FcPatternGetString(pat, FC_STYLE, j, (FcChar8**)&t) == FcResultMatch; ++j) {
                    std::string full(s);
                    full += " ";
                    full += t;
                    if (name == full) {
                        NameCollection* names = readNames(pat);
                        addToMaps(pat, names);
                        cacheFamilyMembers(names->m_familyNames);
                        delete names;
                        found = true;
                        goto next_font;
                    }
                }
            }

        next_font:
            ;
        }

        if (found || cachedAll)
            break;
        cachedAll = true;
    }
}

void
XeTeXFontMgr_FC::initialize()
{
    if (FcInit() == FcFalse)
        _tt_abort("fontconfig initialization failed");

    if (gFreeTypeLibrary == 0 && FT_Init_FreeType(&gFreeTypeLibrary) != 0)
        _tt_abort("FreeType initialization failed");

    UErrorCode err = U_ZERO_ERROR;

    /* Tectonic: Alpine >=3.16 splits the ICU data in a way that seems to make
     * the "macintosh" converter unavailable in our MUSL static builds. I don't
     * see a workaround: installing `icu-data-full` doesn't help, I think
     * because the static libraries don't access the data file that it provides.
     */
    macRomanConv = ucnv_open("macintosh", &err);
    if (!U_SUCCESS(err)) {
        err = U_ZERO_ERROR;
        macRomanConv = NULL;
    }

    utf16beConv = ucnv_open("UTF16BE", &err);
    utf8Conv = ucnv_open("UTF8", &err);
    if (!U_SUCCESS(err))
        _tt_abort("cannot read font names");

    FcPattern* pat = FcNameParse((const FcChar8*)":outline=true");
    FcObjectSet* os = FcObjectSetBuild(FC_FAMILY, FC_STYLE, FC_FILE, FC_INDEX,
                                       FC_FULLNAME, FC_WEIGHT, FC_WIDTH, FC_SLANT, FC_FONTFORMAT, NULL);
    allFonts = FcFontList(FcConfigGetCurrent(), pat, os);
    FcObjectSetDestroy(os);
    FcPatternDestroy(pat);

    cachedAll = false;
}

void
XeTeXFontMgr_FC::terminate()
{
    if (allFonts != NULL) {
        FcFontSetDestroy(allFonts);
        allFonts = NULL;
    }

    if (macRomanConv != NULL) {
        ucnv_close(macRomanConv);
        macRomanConv = NULL;
    }
    if (utf16beConv != NULL) {
        ucnv_close(utf16beConv);
        utf16beConv = NULL;
    }
    if (utf8Conv != NULL) {
        ucnv_close(utf8Conv);
        utf8Conv = NULL;
    }
}

std::string
XeTeXFontMgr_FC::getPlatformFontDesc(PlatformFontRef font) const
{
    std::string path;
    FcChar8* s;
    if (FcPatternGetString(font, FC_FILE, 0, (FcChar8**)&s) == FcResultMatch)
        path = (char*)s;
    else
        path = "[unknown]";
    return path;
}