from __future__ import absolute_import

import os
import random
import string


def random_string(size=6, chars=string.ascii_uppercase + string.digits):
    """ Generates a random string """
    return ''.join(random.choice(chars) for _ in range(size))


def random_infohash():
    """ Generates a random torrent infohash binary string """
    return os.urandom(20)


def random_utf8_string(length=6):
    """ Generates a random utf8 string """
    try:
        get_char = unichr
    except NameError:
        get_char = chr

    # Update this to include code point ranges to be sampled
    include_ranges = [
        (0x0021, 0x0021),
        (0x0023, 0x0026),
        (0x0028, 0x007E),
        (0x00A1, 0x00AC),
        (0x00AE, 0x00FF),
        (0x0100, 0x017F),
        (0x0180, 0x024F),
        (0x2C60, 0x2C7F),
        (0x16A0, 0x16F0),
        (0x0370, 0x0377),
        (0x037A, 0x037E),
        (0x0384, 0x038A),
        (0x038C, 0x038C),
    ]

    alphabet = [
        get_char(code_point) for current_range in include_ranges
        for code_point in range(current_range[0], current_range[1] + 1)
    ]
    return ''.join(random.choice(alphabet) for i in range(length))
