# Based on https://github.com/FontCustom/fontcustom/blob/master/lib/fontcustom/scripts/generate.py

import fontforge
import os
import sys
import json
import re
from subprocess import call
from distutils.spawn import find_executable
import shlex

args = json.load(sys.stdin)

f = fontforge.font()
f.encoding = 'UnicodeFull'
f.copyright = ''
f.design_size = 16
f.em = args['fontHeight']
f.descent = args['descent']
f.ascent = args['fontHeight'] - args['descent']
if args['version']:
    f.version = args['version']
if args['normalize']:
    f.autoWidth(0, 0, args['fontHeight'])

KERNING = 15


def create_empty_char(f, c):
    f.createChar(ord(c), c).glyphPen().moveTo((0, 0))


if args['addLigatures']:
    f.addLookup('liga', 'gsub_ligature', (), (('liga', (('latn', ('dflt')),)),))
    f.addLookupSubtable('liga', 'liga')

for dirname, dirnames, filenames in os.walk(args['inputDir']):
    for filename in sorted(filenames):
        name, ext = os.path.splitext(filename)
        filePath = os.path.join(dirname, filename)
        size = os.path.getsize(filePath)

        if ext in ['.svg']:
            # HACK: Remove <switch> </switch> tags
            svgfile = open(filePath, 'r+')
            svgtext = svgfile.read()
            svgfile.seek(0)

            # Replace the <switch> </switch> tags with nothing
            svgtext = svgtext.replace('<switch>', '')
            svgtext = svgtext.replace('</switch>', '')

            if args['normalize']:
                # Replace the width and the height
                svgtext = re.sub(r'(<svg[^>]*)width="[^"]*"([^>]*>)', r'\1\2', svgtext)
                svgtext = re.sub(r'(<svg[^>]*)height="[^"]*"([^>]*>)', r'\1\2', svgtext)

            # Remove all contents of file so that we can write out the new contents
            svgfile.truncate()
            svgfile.write(svgtext)
            svgfile.close()

            cp = args['codepoints'][name]

            if args['addLigatures']:
                name = str(name)  # Convert Unicode to a regular string because addPosSub doesn't work with Unicode
                for char in name:
                    create_empty_char(f, char)
                glyph = f.createChar(cp, name)
                glyph.addPosSub('liga', tuple(name))
            else:
                glyph = f.createChar(cp, str(name))
            glyph.importOutlines(filePath)

            if args['normalize']:
                glyph.left_side_bearing = glyph.right_side_bearing = 0
            elif name[1:] in args['zerowidth']:
                glyph.left_side_bearing = glyph.right_side_bearing = 0
                glyph.width = 0
            else:
                glyph.width = args['fontHeight']

            if args['round']:
                glyph.round(int(args['round']))

fontfile = args['dest'] + os.path.sep + args['fontFilename']

f.fontname = args['fontFilename']
f.familyname = args['fontFamilyName']
f.fullname = args['fontFamilyName']

if args['addLigatures']:
    def generate(filename):
        f.generate(filename, flags=('opentype'))
else:
    def generate(filename):
        f.generate(filename)

# TTF
generate(fontfile + '.ttf')

# Hint the TTF file
# ttfautohint is optional
if args['autoHint'] and find_executable('ttfautohint'):
    call(shlex.split('ttfautohint --symbol --fallback-script=latn --no-info "%(font)s.ttf" "%(font)s-hinted.ttf" && mv "%(font)s-hinted.ttf" "%(font)s.ttf"' % {'font': fontfile}))
    f = fontforge.open(fontfile + '.ttf')

# SVG
if 'svg' in args['types']:
    generate(fontfile + '.svg')

    # Fix SVG header for webkit (from: https://github.com/fontello/font-builder/blob/master/bin/fontconvert.py)
    svgfile = open(fontfile + '.svg', 'r+')
    svgtext = svgfile.read()
    svgfile.seek(0)
    svgfile.write(svgtext.replace('<svg>', '<svg xmlns="http://www.w3.org/2000/svg">'))
    svgfile.close()

scriptPath = os.path.dirname(os.path.realpath(__file__))

# WOFF
if 'woff' in args['types']:
    generate(fontfile + '.woff')

# WOFF2
woff2_generated = False
if ('woff2' in args['types']):
    try:
        generate(fontfile + '.woff2')
        woff2_generated = True
    except Exception as ext:
        print('Current version of FontForge seems to be unable to generate woff2 font, falling back to ttf2woff2, reason is %s', ext)
else:
    woff2_generated = True

# EOT
if 'eot' in args['types']:
    # eotlitetool.py script to generate IE7-compatible .eot fonts
    call(shlex.split('python "%(path)s/../../bin/eotlitetool.py" "%(font)s.ttf" --output "%(font)s.eot"' % {'path': scriptPath, 'font': fontfile}))

# Delete TTF if not needed
if ('ttf' not in args['types']) and woff2_generated:
    os.remove(fontfile + '.ttf')

print(json.dumps({'file': fontfile}))