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#!/usr/bin/env python

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# -*- coding: utf-8 -*-

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# This file is part of Beremiz

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# Copyright (C) 2021: Edouard TISSERANT

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#

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# See COPYING file for copyrights details.

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from __future__ import print_function

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import sys

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from base64 import b64encode

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from fontTools import ttLib

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# Inkscape seems to refer to font with different family name depending on platform.

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# this are heuristics that would need extensive testing to be sure.

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FamilyNameIDs = [1] if sys.platform.startswith('win') else [1, 16]

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def GetFontTypeAndFamilyName(filename):

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    """

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    Getting font family, format and MIME type

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    """

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    familyname = None

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    uniquename = None

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    formatname = None

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    mimetype = None

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    font = ttLib.TTFont(filename)

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    # https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6name.html

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    for name in font["name"].names:

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        #print(name.nameID, name.platformID, name.langID, name.toUnicode())

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        if name.nameID in FamilyNameIDs and name.platformID==3 and name.langID==1033:

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            familyname = name.toUnicode()

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        if name.nameID==4 and name.platformID==3 and name.langID==1033:

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            uniquename = name.toUnicode()

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    if font.flavor :

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        # woff and woff2

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        formatname = font.flavor

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        mimetype = "font/" + formatname

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    # conditions on sfntVersion was deduced from fontTools.ttLib.sfnt

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    elif font.sfntVersion in ("\x00\x01\x00\x00", "true"):

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        formatname = "truetype"

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        mimetype = "font/ttf"

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    elif font.sfntVersion == "OTTO":

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        formatname = "opentype"

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        mimetype = "font/otf"

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    return familyname,uniquename,formatname,mimetype

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def DataURIFromFile(filename, mimetype):

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    with open(filename, "rb") as fp:

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        data = fp.read()

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    return "".join([

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        "data:",

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        mimetype,

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        ";base64,",

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        b64encode(data).decode().strip()])

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def GetCSSFontFaceFromFontFile(filename):

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    familyname, uniquename, formatname, mimetype = GetFontTypeAndFamilyName(filename)

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    data_uri = DataURIFromFile(filename, mimetype)

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    css_font_face = \

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    """

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    @font-face {{

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          font-family: "{}";

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          src: url("{}") format("{}")

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    }}

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    """.format(familyname, data_uri, formatname)

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    return css_font_face

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# tests

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if __name__ == '__main__':

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    print(GetCSSFontFaceFromFontFile("/usr/share/matplotlib/mpl-data/fonts/ttf/DejaVuSans.ttf"))

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    print(GetCSSFontFaceFromFontFile("/usr/share/fonts/opentype/urw-base35/NimbusSans-Regular.otf"))

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    print(GetCSSFontFaceFromFontFile("/usr/share/yelp/mathjax/fonts/HTML-CSS/TeX/woff/MathJax_SansSerif-Regular.woff"))