#!/usr/bin/env python3
# coding=utf8
#
# Usually called via
# $ fontforge check_glyphs fontfile1.tff [fontfile2.ttf ...] 2>/dev/null
#
# The output differs depending on number of specified fonts.
# If only one font is examined full detail is shown.
# If more fonts are specified only a summary for each font is listed.

import sys
import os.path
import fontforge

count_o = 0
count_i = 0
count_d = 0

def val_to_text(v):
    global count_o
    global count_i
    global count_d
    parts = [ ]
    if v & 2:
        parts += ['open']
        count_o += 1
    else:
        parts += ['    ']
    if v & 4:
        parts += ['intersect']
        count_i += 1
    else:
        parts += ['         ']
    if v & 8:
        parts += ['direction']
        count_d += 1
    else:
        parts += ['         ']
    return ' '.join(parts)

###### Let's go!

if len(sys.argv) < 2:
    print('Usage: {} font_name [font_name ...]\n'.format(sys.argv[0]))
    sys.exit(1)

print('Examining {} font files'.format(len(sys.argv) - 1))
batch_mode = len(sys.argv) > 2
if batch_mode:
    print('Batch mode enabled')
    print('| {:40} | {:5} | {:4} | {:4} | {:4} |'.format('file', '#glyp', 'open', 'self', 'dir'))

for filename in sys.argv[1:]:
    fullfile = os.path.basename(filename)
    fname = os.path.splitext(fullfile)[0]
    font = fontforge.open(filename, 1)
    # print('======== {} ========'.format(fullfile))

    font.encoding = 'UnicodeFull'
    count = 0
    count_o = 0
    count_i = 0
    count_d = 0
    for c in range (1, 0xffffff):
        if not c in font:
            continue
        font[c].unlinkRef()
        font[c].removeOverlap()
        val = val_to_text(font[c].validate(True))
        if font[c].validation_state & 0xE:
            if not batch_mode:
                print(' {:04X} {:08X} {}  {}'.format(c, font[c].validation_state, val, font[c].glyphname))
            font[c].correctDirection()

        count += 1
    if not batch_mode:
        print('======== {} ========'.format(fullfile))
        print('Sum of problems: open {}, intersect {}, direction {} (for a total of {} glyphs)'.format(count_o, count_i, count_d, count))
    else:
        print('| {:40} | {:5} | {:4} | {:4} | {:4} |'.format(fullfile, count, count_o, count_i, count_d))
    font.close()