# -*- coding: utf-8 -*-
from __future__ import unicode_literals
# Erik Stein <code@classlibrary.net>, 2015-2017

from django.utils import six
from django.utils.encoding import force_text, smart_text
from django.utils.functional import allow_lazy, keep_lazy_text
from django.utils.safestring import SafeText
from django.utils.text import slugify
from django.utils.translation import ugettext as _, ugettext_lazy

from HTMLParser import HTMLParser
import translitcodec  # provides 'translit/long', used by codecs.encode()
import codecs


@keep_lazy_text
def downgrade(value):
    """
    Downgrade unicode to ascii, transliterating accented characters.
    """
    value = force_text(value)
    return codecs.encode(value, 'translit/long')


@keep_lazy_text
def slugify_long(value):
    return slugify(downgrade(value))


# Spreading umlauts is included in the translit/long codec.
slugify_german = slugify_long


def html_entities_to_unicode(html):
    parser = HTMLParser()
    return parser.unescape(html)
html_entities_to_unicode = allow_lazy(html_entities_to_unicode, six.text_type, SafeText)


# Translators: This string is used as a separator between list elements
DEFAULT_SEPARATOR = ugettext_lazy(", ")

@keep_lazy_text
def get_text_joined(list_, separator=DEFAULT_SEPARATOR, last_word=ugettext_lazy(' and ')):
    list_ = list(list_)
    if len(list_) == 0:
        return ''
    if len(list_) == 1:
        return force_text(list_[0])
    return '%s%s%s' % (
        separator.join(force_text(i) for i in list_[:-1]),
        force_text(last_word), force_text(list_[-1]))