import calendar
import datetime
import random
import re
import string
import time
import unicodedata


def id_generator(size=6, chars=string.ascii_uppercase + string.digits):
    return ''.join(random.SystemRandom().choice(chars) for _ in range(size))


def retry_wrapper(func, max_retry, timeout=5):
    result = None
    ret_code = 0
    n_retry = 0
    while n_retry < max_retry:
        try:
            result = func()
            break
        except Exception as e:
            print(e)
            n_retry += 1
    if n_retry == max_retry:
        ret_code = -1
    time.sleep(timeout)
    return ret_code, result


def slugify(value, allow_unicode=True, simple=True):
    """
    Modified from Django
    Convert to ASCII if 'allow_unicode' is False. Convert spaces to hyphens.
    Remove characters that aren't alphanumerics, underscores, or hyphens.
    Convert to lowercase. Also strip leading and trailing whitespace.
    """
    value = str(value)
    if allow_unicode:
        value = unicodedata.normalize('NFKC', value)
    else:
        value = unicodedata.normalize('NFKD', value).encode('ascii', 'ignore').decode('ascii')
    if simple:
        value = re.sub(r'[/.]', '_', value)
        return value
    else:
        value = re.sub(r'[^\w\s-]', '_', value).strip().lower()
        return re.sub(r'[-\s]+', '-', value)


def get_day_of_week(year, month, day):
    date = datetime.date(year, month, day)
    return calendar.day_name[date.weekday()]