# -*- coding: utf-8 -*-
from django.core.exceptions import ValidationError
import pytils, re

def is_positive_integer(data,
                        msg='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)

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 = u'%s'%string
    string = string.replace(u'\u200e', '')

    #make string translit
    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()