# coding: utf-8
# Copyright 2013 The Font Bakery Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# See AUTHORS.txt for the list of Authors and LICENSE.txt for the License.
import fontforge
import os.path as op

from fontTools import ttLib


class BaseFont(object):

    @staticmethod
    def get_ttfont(path):
        return Font(path)

    @staticmethod
    def get_ttfont_from_metadata(path, font_metadata, is_menu=False):
        path = op.join(op.dirname(path), font_metadata.filename)
        if is_menu:
            path = path.replace('.ttf', '.menu')
        return Font.get_ttfont(path)


class Font(BaseFont):

    def __init__(self, fontpath):
        if fontpath[-4:] == '.ttx':
            self.ttfont = ttLib.TTFont(None)
            self.ttfont.importXML(fontpath, quiet=True)
        else:
            self.ttfont = ttLib.TTFont(fontpath)

        self.ascents = AscentGroup(self.ttfont)
        self.descents = DescentGroup(self.ttfont)
        self.linegaps = LineGapGroup(self.ttfont)

    def __getitem__(self, key):
        """ Returns TTFont table with key name
        >>> font = Font("tests/fixtures/ttf/Font-Bold.ttf")
        >>> font['name'].tableTag
        'name'
        """
        return self.ttfont[key]

    def get_program_bytecode(self):
        """ Return binary program code from "prep" table.
        >>> font = Font("tests/fixtures/ttf/Font-Bold.ttf")
        >>> font.get_program_bytecode()
        '\\xb8\\x01\\xff\\x85\\xb0\\x04\\x8d'
        """
        try:
            return self['prep'].program.getBytecode()
        except KeyError:
            return ""

    def get_bounding(self):
        """ Returns max and min bbox font
        >>> font = Font("tests/fixtures/ttf/Font-Regular.ttf")
        >>> font.get_bounding()
        (-384, 1178)
        """
        if self.ttfont.sfntVersion == 'OTTO':
            return self['head'].yMin, self['head'].yMax

        ymax = 0
        for g in self['glyf'].glyphs:
            char = self['glyf'][g]
            if hasattr(char, 'yMax') and ymax < char.yMax:
                ymax = char.yMax

        ymin = 0
        for g in self['glyf'].glyphs:
            char = self['glyf'][g]
            if hasattr(char, 'yMin') and ymin > char.yMin:
                ymin = char.yMin

        return ymin, ymax

    @property
    def license_url(self):
        """ Return LicenseURL from "name" table
        >>> font = Font("tests/fixtures/ttf/Font-Regular.ttf")
        >>> font.license_url
        u'http://scripts.sil.org/OFL'
        """
        for name in self.names:
            if name.nameID == 14:
                return Font.bin2unistring(name)

    @property
    def macStyle(self):
        return self['head'].macStyle

    @property
    def italicAngle(self):
        return self['post'].italicAngle

    @property
    def names(self):
        return self['name'].names

    @property
    def glyphs(self):
        """ Returns list of glyphs names in fonts
        >>> font = Font("tests/fixtures/ttf/Font-Regular.ttf")
        >>> int(len(font.glyphs))
        502
        """
        return self.ttfont.getGlyphOrder()

    @property
    def OS2_usWeightClass(self):
        """ OS/2.usWeightClass property value
        >>> font = Font("tests/fixtures/ttf/Font-Regular.ttf")
        >>> int(font.OS2_usWeightClass)
        400
        """
        return self['OS/2'].usWeightClass

    @property
    def OS2_usWidthClass(self):
        """ Returns OS/2.usWidthClass property value
        >>> font = Font("tests/fixtures/ttf/Font-Regular.ttf")
        >>> font.OS2_usWidthClass
        5
        """
        return self['OS/2'].usWidthClass

    @property
    def OS2_fsType(self):
        """ OS/2.fsType property value
        >>> font = Font("tests/fixtures/ttf/Font-Regular.ttf")
        >>> int(font.OS2_fsType)
        8
        """
        return self['OS/2'].fsType

    def platform_entry(self, entry):
        if entry.platformID == 1 and entry.langID == 0:
            return Font.bin2unistring(entry)
        elif entry.platformID == 3 and entry.langID == 0x409:
            return Font.bin2unistring(entry)

    @property
    def fullname(self):
        """ Returns fullname of fonts
        >>> font = Font("tests/fixtures/ttf/Font-Regular.ttf")
        >>> font.fullname
        u'Monda Regular'
        """
        for entry in self.names:
            if entry.nameID != 4:
                continue
            value = self.platform_entry(entry)
            if value:
                return value
        return ''

    @property
    def _style_name(self):
        for entry in self.names:
            if entry.nameID != 2:
                continue
            value = self.platform_entry(entry)
            if value:
                return value
        return ''

    @property
    def stylename(self):
        """ Returns OpenType specific style name
        >>> font = Font("tests/fixtures/ttf/Font-Bold.ttf")
        >>> font.stylename
        u'Bold'
        """
        return self._style_name

    @property
    def _family_name(self):

        for entry in self.names:
            if entry.nameID != 1:
                continue
            value = self.platform_entry(entry)
            if value:
                return value
        return ''

    @property
    def familyname(self):
        """ Returns fullname of fonts
        >>> font = Font("tests/fixtures/ttf/Font-Bold.ttf")
        >>> font.familyname
        u'Font'
        """
        return self._family_name

    @property
    def ot_family_name(self):
        """ Returns Windows-only Opentype-specific FamilyName """
        for entry in self.names:
            # This value must be only for windows platform as in
            # mac it addresses some problems with installing fonts with
            # that ids
            if entry.nameID != 16 or entry.platformID != 3:
                continue
            value = self.platform_entry(entry)
            if value:
                return value
        return ''

    @property
    def ot_style_name(self):
        """ Returns Windows-only Opentype-specific StyleName """
        for entry in self.names:
            # This value must be only for windows platform as in
            # mac it addresses some problems with installing fonts with
            # that ids
            if entry.nameID != 17 or entry.platformID != 3:
                continue
            value = self.platform_entry(entry)
            if value:
                return value
        return ''

    @property
    def ot_full_name(self):
        """ Returns Windows-only Opentype-specific FullName """
        for entry in self.names:
            # This value must be only for windows platform as in
            # mac it addresses some problems with installing fonts with
            # that ids
            if entry.nameID != 18 or entry.platformID != 3:
                continue
            value = self.platform_entry(entry)
            if value:
                return value
        return ''

    @property
    def post_script_name(self):
        """ Returns post script name
        >>> font = Font("tests/fixtures/ttf/Font-Bold.ttf")
        >>> font.post_script_name
        u'Font-Bold'
        """
        for entry in self.names:
            if entry.nameID != 6:
                continue
            value = self.platform_entry(entry)
            if value:
                return value
        return ''

    def retrieve_cmap_format_4(self):
        """ Returns cmap table format 4
        >>> font = Font("tests/fixtures/ttf/Font-Regular.ttf")
        >>> int(font.retrieve_cmap_format_4().platEncID)
        3
        """
        for cmap in self['cmap'].tables:
            if cmap.format == 4:
                return cmap

    def advance_width(self, glyph_id=None):
        """ AdvanceWidth of glyph from "hmtx" table
        >>> font = Font("tests/fixtures/ttf/Font-Regular.ttf")
        >>> int(font.advance_width("a"))
        572
        """
        if not glyph_id:
            return self['hhea'].advanceWidthMax
        try:
            return self['hmtx'].metrics[glyph_id][0]
        except KeyError:
            return None

    @staticmethod
    def bin2unistring(record):
        if b'\000' in record.string:
            return record.string.decode('utf-16-be')
        elif not isinstance(record.string, unicode):
            return unicode(record.string, 'unicode_escape')
        return record.string

    def get_loca_glyph_offset(self, num):
        """ Retrieve offset of glyph in font tables
        >>> font = Font("tests/fixtures/ttf/Font-Regular.ttf")
        >>> int(font.get_loca_glyph_offset(15))
        836
        >>> int(font.get_loca_glyph_offset(16))
        904
        """
        return self['loca'].locations[num]

    def get_loca_glyph_length(self, num):
        """ Retrieve length of glyph in font loca table
        >>> font = Font("tests/fixtures/ttf/Font-Regular.ttf")
        >>> int(font.get_loca_glyph_length(15))
        68
        """
        return self.get_loca_glyph_offset(num + 1) - self.get_loca_glyph_offset(num)

    def get_loca_num_glyphs(self):
        """ Retrieve number of glyph in font loca table
        >>> font = Font("tests/fixtures/ttf/Font-Regular.ttf")
        >>> font.get_loca_num_glyphs()
        503
        """
        return len(self['loca'].locations)

    def get_hmtx_max_advanced_width(self):
        """ AdvanceWidthMax from "hmtx" table
        >>> font = Font("tests/fixtures/ttf/Font-Regular.ttf")
        >>> font.get_hmtx_max_advanced_width()
        1409
        """
        advance_width_max = 0
        for g in self['hmtx'].metrics.values():
            advance_width_max = max(g[0], advance_width_max)
        return advance_width_max

    @property
    def advance_width_max(self):
        """ AdvanceWidthMax from "hhea" table
        >>> font = Font("tests/fixtures/ttf/Font-Regular.ttf")
        >>> font.advance_width_max
        1409
        """
        return self.advance_width()

    def get_upm_height(self):
        return self['head'].unitsPerEm

    def get_highest_and_lowest(self):
        high = []
        low = []
        if self.ttfont.sfntVersion == 'OTTO':
            return high, low
        maxval = self.ascents.get_max()
        minval = self.descents.get_min()
        for glyph, params in self['glyf'].glyphs.items():
            if hasattr(params, 'yMax') and params.yMax > maxval:
                high.append(glyph)
            if hasattr(params, 'yMin') and params.yMin < minval:
                low.append(glyph)
        return high, low

    def save(self, fontpath):
        self.ttfont.save(fontpath)


def is_none_protected(func):

    def f(self, value):
        if value is None:
            return
        func(self, value)

    return f


class AscentGroup(object):

    def __init__(self, ttfont):
        self.ttfont = ttfont

    def set(self, value):
        self.hhea = value
        self.os2typo = value
        self.os2win = value

    def get_max(self):
        """ Returns largest value of ascents
        >>> font = Font("tests/fixtures/ttf/Font-Regular.ttf")
        >>> font.ascents.get_max()
        1178
        """
        return max(self.hhea, self.os2typo, self.os2win)

    def hhea():
        doc = """Ascent value in 'Horizontal Header' (hhea.ascent)
        >>> font = Font("tests/fixtures/ttf/Font-Regular.ttf")
        >>> font.ascents.hhea
        1178
        """

        def fget(self):
            return self.ttfont['hhea'].ascent

        @is_none_protected
        def fset(self, value):
            self.ttfont['hhea'].ascent = value

        return locals()
    hhea = property(**hhea())

    def os2typo():
        doc = """Ascent value in 'Horizontal Header' (OS/2.sTypoAscender)
        >>> font = Font("tests/fixtures/ttf/Font-Regular.ttf")
        >>> font.ascents.os2typo
        1178
        """

        def fget(self):
            return self.ttfont['OS/2'].sTypoAscender

        @is_none_protected
        def fset(self, value):
            self.ttfont['OS/2'].sTypoAscender = value

        return locals()
    os2typo = property(**os2typo())

    def os2win():
        doc = """Ascent value in 'Horizontal Header' (OS/2.usWinAscent)
        >>> font = Font("tests/fixtures/ttf/Font-Regular.ttf")
        >>> font.ascents.os2win
        1178
        """

        def fget(self):
            return self.ttfont['OS/2'].usWinAscent

        @is_none_protected
        def fset(self, value):
            self.ttfont['OS/2'].usWinAscent = value

        return locals()
    os2win = property(**os2win())


class DescentGroup(object):

    def __init__(self, ttfont):
        self.ttfont = ttfont

    def set(self, value):
        self.hhea = value
        self.os2typo = value
        self.os2win = value

    def get_min(self):
        """ Returns least value of descents.
        >>> font = Font("tests/fixtures/ttf/Font-Regular.ttf")
        >>> font.descents.get_min()
        -384
        """
        return min(self.hhea, self.os2typo, self.os2win)

    def hhea():
        doc = """ Descent value in 'Horizontal Header' (hhea.descent)
        >>> font = Font("tests/fixtures/ttf/Font-Regular.ttf")
        >>> font.descents.hhea
        -384
        """

        def fget(self):
            return self.ttfont['hhea'].descent

        @is_none_protected
        def fset(self, value):
            self.ttfont['hhea'].descent = value

        return locals()
    hhea = property(**hhea())

    def os2typo():
        doc = """Descent value in 'Horizontal Header' (OS/2.sTypoDescender)
        >>> font = Font("tests/fixtures/ttf/Font-Regular.ttf")
        >>> font.descents.os2typo
        -384
        """

        def fget(self):
            return self.ttfont['OS/2'].sTypoDescender

        @is_none_protected
        def fset(self, value):
            self.ttfont['OS/2'].sTypoDescender = value

        return locals()
    os2typo = property(**os2typo())

    def os2win():
        doc = """Descent value in 'Horizontal Header' (OS/2.usWinDescent)
        >>> font = Font("tests/fixtures/ttf/Font-Regular.ttf")
        >>> font.descents.os2win
        384
        """

        def fget(self):
            return self.ttfont['OS/2'].usWinDescent

        @is_none_protected
        def fset(self, value):
            self.ttfont['OS/2'].usWinDescent = abs(value)

        return locals()
    os2win = property(**os2win())


class LineGapGroup(object):

    def __init__(self, ttfont):
        self.ttfont = ttfont

    def set(self, value):
        self.hhea = value
        self.os2typo = value

    def hhea():
        doc = "The hhea.lineGap property"

        def fget(self):
            return self.ttfont['hhea'].lineGap

        @is_none_protected
        def fset(self, value):
            self.ttfont['hhea'].lineGap = value

        return locals()
    hhea = property(**hhea())

    def os2typo():
        doc = "The OS/2.sTypoLineGap property"

        def fget(self):
            return self.ttfont['OS/2'].sTypoLineGap

        @is_none_protected
        def fset(self, value):
            self.ttfont['OS/2'].sTypoLineGap = value

        return locals()
    os2typo = property(**os2typo())


class FontTool:

    @staticmethod
    def get_tables(path):
        """ Retrieves tables names existing in font
        >>> sorted(FontTool.get_tables("tests/fixtures/ttf/Font-Regular.ttf"))
        ['DSIG', 'FFTM', 'GDEF', 'GPOS', 'GSUB', 'OS/2', 'cmap', 'gasp', \
'glyf', 'head', 'hhea', 'hmtx', 'kern', 'loca', 'maxp', 'name', 'post']
        """
        font = ttLib.TTFont(path)
        return font.reader.tables.keys()


def getName(font, pairs):
    value = None
    for pair in pairs:
        value = font['name'].getName(*pair)
        if value:
            break

    value = value.string.decode(value.getEncoding())

    assert value, u'{} seems to be missed in NAME table'.format(pairs)
    return value


def getSuggestedFontNameValues(font):
    family_name = getName(font, [[1, 3, 1]])

    subfamily_name = getName(font, [[2, 3, 1]])

    full_name = getName(font, [[4, 3, 1]])

    if full_name == family_name:
        try:
            family_name, subfamily_name = full_name.split(' ', 1)[:]
        except ValueError:
            pass

    if subfamily_name == 'Normal' or subfamily_name == 'Roman':
        subfamily_name = 'Regular'
    elif subfamily_name == 'Heavy':
        subfamily_name = 'Black'
    elif subfamily_name == 'Heavy Italic':
        subfamily_name = 'Black Italic'

    if font['post'].italicAngle != 0 or font['head'].macStyle & 0b10:
        subfamily_name = 'Italic'
        if font['head'].macStyle & 0b01:
            subfamily_name = 'Bold{}'.format(subfamily_name)

    return {'family': family_name, 'subfamily': subfamily_name}