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from django.utils.crypto import get_random_string

def secret_token(request, size=50):
  return get_random_string(size)

def humanreadable_timedelta(
        theDateAndTime,
        precise=False,
        complete=False,
        fromDate=None):

    if not theDateAndTime:
        return ""
    if not fromDate:
        fromDate = datetime.now(timezone.utc)
    if theDateAndTime > fromDate:
        return None
    elif theDateAndTime == fromDate:
        return _('now')

    delta = fromDate - theDateAndTime

    '''
    the timedelta structure does not have all units; bigger units are converted
    into smaller ones (hours -> seconds, minutes -> seconds, weeks > days, ...)
    but we need all units:
    '''
    deltaMinutes = delta.seconds // 60
    deltaHours = delta.seconds // 3600
    deltaYears = delta.days // 365
    deltaMonths = delta.days // 30
    deltaMinutes -= deltaHours * 60
    deltaWeeks = delta.days // 7
    deltaSeconds = delta.seconds - deltaMinutes * 60 - deltaHours * 3600
    deltaDays = delta.days - deltaWeeks * 7
    deltaMilliSeconds = delta.microseconds // 1000
    deltaMicroSeconds = delta.microseconds - deltaMilliSeconds * 1000

    valuesAndNames = [
        (deltaYears, _('year')),
        (deltaMonths, _('month')),
        (deltaWeeks, _('week')),
        (deltaDays, _('day')),
        (deltaHours, _('hour')),
        (deltaMinutes, _('minute')),
        (deltaSeconds, _('second'))
    ]
    if precise:
        valuesAndNames.append((deltaMilliSeconds, _('millisecond')))
        valuesAndNames.append((deltaMicroSeconds, _('microsecond')))

    text = ""
    for value, name in valuesAndNames:
        if complete:
            if value > 0:
                text += len(text) and ", " or ""
                text += "%d %s" % (value, name)
                text += (value > 1) and "s" or ""
        else:
            if value > 0:
                text += "%d %s" % (value, name)
                text += (value > 1) and "s" or ""
                break

    # replacing last occurrence of a comma by an 'and'
    if text.find(",") > 0:
        text = " and ".join(text.rsplit(", ", 1))

    return text