# -*- coding: utf-8 -*-
import re
import random
from typing import Tuple
from pprint import pprint
from datetime import datetime, timedelta

TIME_UNITS = {
    's': 'seconds',
    'm': 'minutes',
    'h': 'hours',
    'd': 'days',
    'w': 'weeks',
    'mon': 'months',
    'y': 'years',
}

pp = pprint


def date_from_iso(date: str) -> datetime:
    return datetime.strptime(date, '%Y-%m-%dT%H:%M:%S.%fZ')


def time_delta(text: str) -> timedelta:
    match = re.match(r'(\d+)(s|m|h|d|mon|w|y)', text)
    if match:
        num, unit = match.groups()
        num = int(num)
        if unit == 's':
            unit = 'seconds'
        elif unit == 'm':
            unit = 'minutes'
        elif unit == 'h':
            unit = 'hours'
        elif unit == 'd':
            unit = 'days'
        elif unit == 'w':
            unit = 'weeks'
        elif unit == 'mon':
            unit = 'weeks'
            num *= 4
        elif unit == 'y':
            unit = 'weeks'
            num *= 52
        return timedelta(**{unit: num})


def parse_int(val: str, select: bool = True) -> Tuple[int, str]:
    try:
        val = int(val)
        if val is not 0:
            if val < 1:
                order = 'desc'
                val *= -1
            else:
                order = 'asc'
            if select:
                val -= 1
            return val, order
    except ValueError:
        pass


def re_generator(low: int = 5, high: int = 20) -> str:
    return 'R{}'.format('E' * random.randint(low, high))