# -*- coding: utf-8 -*-
import unicodedata as ud
from django.core.exceptions import ValidationError
import pytils, re
from django.utils.translation import ugettext as _

def is_positive_integer(data,
                        msg=_(u'Введите правильное значение')):
    """
    function checking if data positive integer
    """
    if not data:
        return
    elif data.isdigit() and int(data) > 0:
        return int(data)
    else:
        raise ValidationError(msg)

from django.utils.encoding import smart_str, smart_unicode
import unicodedata
def translit_with_separator(string, separator='-'):
    """
    Trsanslit string and replace "bad" symbols for separator

    usage: translit_with_separator('введите, слово', '_') return 'vvedite_slovo'

    """

    #make string unicode
    string = string.strip()
    string = smart_unicode(string)

    #make string translit
    try:
        st = pytils.translit.translify(string)
    except ValueError:
        string = unicodedata.normalize('NFKD', string).encode('ascii','ignore')
        st = pytils.translit.translify(string)

    #replace "bad" symbols for '-'symbol
    st = st.replace('.', '')
    st = re.sub('[^\w\-_\.]', separator, st)
    #delete dublicating separators
    st = re.sub('%s+'%separator, separator, st)
    # delete if last symbol == separator
    if st[-1] == separator:
        st = st[:-1]


    return st.lower()


def is_latin_char(uchr):
    latin_letters= {}
    try: return latin_letters[uchr]
    except KeyError:
         return latin_letters.setdefault(uchr, 'LATIN' in ud.name(uchr))

def is_latin(unistr):
    return all(is_latin_char(uchr)
           for uchr in unistr
           if uchr.isalpha())