from __future__ import unicode_literals

import pycountry

from django.utils.translation import ugettext_lazy as _

from .settings import setting_language_codes


def get_language_choices():
    return sorted(
        [
            (
            iso639_3, _(pycountry.languages.get(alpha_3=iso639_3).name)
            ) for iso639_3 in setting_language_codes.value
        ], key=lambda x: x[1]
    )


def parse_range(astr):
    # http://stackoverflow.com/questions/4248399/
    # page-range-for-printing-algorithm
    result = set()
    for part in astr.split(','):
        x = part.split('-')
        result.update(range(int(x[0]), int(x[-1]) + 1))
    return sorted(result)