import datetime
from pprint import pprint

import natsort
import pydash as _;
from django.core import validators
from django.core.exceptions import ObjectDoesNotExist
from django.core.files.storage import FileSystemStorage
from django.shortcuts import _get_queryset
from django.utils import timezone

_.map = _.map_;
_.filter = _.filter_
import random
import string


def take(coll, n):
    chunk = coll[0:n]
    del coll[0:n]
    return chunk


def take_random(coll, n):
    if n == 0:
        return []

    chunk = _.sample(coll, n)

    for item in chunk:
        coll.remove(item)

    return chunk


def take_one_random(coll):
    if len(coll) == 0:
        return None

    return coll.pop(_.random(0, len(coll) - 1))


def random_phone():
    return '+7' + str(_.sample((917, 964, 965, 987, 912, 935))) + str(_.random(1000000, 9999999))


def random_date():
    return timezone.utc.localize(timezone.datetime(_.random(2012, 2018), _.random(1, 12), _.random(1, 28)))


def random_amount():
    return random.random() * random.choice((100, 1000, 10000))


def get_or_none(klass, *args, **kwargs):
    queryset = _get_queryset(klass)

    try:
        return queryset.get(*args, **kwargs)
    except queryset.model.DoesNotExist:
        return None


def get_related_or_none(obj, attr):
    try:
        rel = getattr(obj, attr)
    except ObjectDoesNotExist:
        rel = None

    return rel


def has_related(obj, attr):
    try:
        return bool(getattr(obj, attr))
    except ObjectDoesNotExist:
        return False


def get_attr_or_none(klass, *args, attr=None, **kwargs):
    object = get_or_none(klass, *args, **kwargs)

    if object and attr and isinstance(attr, str):
        return getattr(object, attr, None)


def model_fields(model, width=200):
    fields = natsort.natsorted(model._meta.get_fields(), key=lambda f: f.name)

    pprint([(
                f.name,
                'Relation? %s' % f.is_relation,
                'Null? %s' % getattr(f, 'null', None),
                'Blank? %s' % getattr(f, 'blank', None),
            ) for f in fields], width=width)


def lorem(words=None, sentences=5):
    vocab = _.split((
        'a ac adipiscing amet ante arcu at auctor augue bibendum commodo condimentum consectetur consequat convallis curabitur'
        'cursus diam dictum dignissim dolor donec duis efficitur eget eleifend elit enim erat et eu ex facilisis faucibus feugiat'
        'finibus gravida iaculis id imperdiet in integer ipsum lacinia lacus laoreet lectus leo libero ligula lobortis lorem'
        'luctus maecenas mauris metus mi mollis morbi nam nec neque nisi non nulla nullam nunc odio orci ornare pellentesque'
        'pharetra phasellus porta porttitor posuere pretium proin pulvinar purus quam quis rhoncus rutrum sapien sed sem semper'
        'sit sollicitudin tempor tempus tincidunt tortor turpis ullamcorper ultricies ut varius vehicula vel velit vestibulum'
        'vitae viverra volutpat vulputate'
    ), ' ')

    return _.join(_.times(lambda i_: _.capitalize(_.join(_.sample(vocab, words or _.random(5, 30)), ' ')), sentences),
                  '. ')


def decap(s):
    if not isinstance(s, str):
        raise TypeError('String expected')

    return s[0].lower() + s[1:] if len(s) > 0 else s


def random_ident(length=8):
    return ''.join(
        [random.choice(string.ascii_lowercase)] +
        _.times(lambda x_: random.choice(string.ascii_letters + string.digits), length - 1)
    )


def validate_phone(text):
    text = text.replace(' ', '').replace('-', '')

    validate = validators.RegexValidator(
        regex=r'^((\+7|8)(\(\d{3}\)|(\d{3}))\d{7})$',
        message='Неверный номер телефона. Формат: +71112223344',
    )

    validate(text)


def to_local_datetime(obj):
    if not isinstance(obj, datetime.date):
        raise TypeError('Date expected')

    if not isinstance(obj, datetime.datetime):
        obj = datetime.datetime.combine(obj, datetime.time.min)

    if not getattr(obj, 'tzinfo', None):
        obj = timezone.utc.localize(obj)

    return obj


def morph(number, words):
    CHOICES = (2, 0, 1, 1, 1, 2)

    if 4 < number % 100 < 20:
        choice = 2
    else:
        choice = CHOICES[number % 10 if number % 10 < 5 else 5]

    return words[choice]


# # Example:
# 
# words = ['яблоко', 'яблока', 'яблок']
# 
# for i in range(0, 30):
#     print(i, morph(i, words))


class ASCIIFileSystemStorage(FileSystemStorage):
    def get_valid_name(self, name):
        symbols = (u"абвгдеёжзийклмнопрстуфхцчшщъыьэюяАБВГДЕЁЖЗИЙКЛМНОПРСТУФХЦЧШЩЪЫЬЭЮЯ",
                   u"abvgdeejzijklmnoprstufhzcss_y_euaABVGDEEJZIJKLMNOPRSTUFHZCSS_Y_EUA")

        tr = {ord(a): ord(b) for a, b in zip(*symbols)}
        name = name.translate(tr)
        return super().get_valid_name(name)