# https://stepik.org/lesson/701985/step/11?unit=702086

from typing import Protocol


class Validator(Protocol):
    def validate(self, value: str) -> bool:
        ...


class ValidatedField:
    ValueValidator: Validator

    def __init__(self, *args, **kwargs):
        self.validator = self.ValueValidator(*args, **kwargs)

    def __set_name__(self, owner, name):
        self.name = "_" + name

    def __get__(self, instance, owner):
        return getattr(instance, self.name)

    def __set__(self, instance, value):
        if self.validator.validate(value):
            setattr(instance, self.name, value)


class StringValue(ValidatedField):
    class ValueValidator(Validator):
        def __init__(self, min_length, max_length):
            self.min_length, self.max_length = min_length, max_length

        def validate(self, value: str) -> bool:
            return (
                isinstance(value, str)
                and self.min_length <= len(value) <= self.max_length
            )


class PriceValue(ValidatedField):
    class ValueValidator(Validator):
        def __init__(self, max_value):
            self.max_value = max_value

        def validate(self, value: str) -> bool:
            return isinstance(value, int) and 0 <= value <= self.max_value


class Product:
    name = StringValue(min_length=2, max_length=50)
    price = PriceValue(max_value=10000)

    def __init__(self, name, price):
        self.name = name
        self.price = price


class SuperShop:
    def __init__(self, name):
        self.name = name
        self.goods: list[Product] = []

    def add_product(self, product: Product):
        self.goods.append(product)

    def remove_product(self, product: Product):
        self.goods.remove(product)


shop = SuperShop("У Балакирева")
shop.add_product(Product("Курс по Python", 0))
shop.add_product(Product("Курс по Python ООП", 2000))
for p in shop.goods:
    print(f"{p.name}: {p.price}")


def tests():
    shop = SuperShop("У Балакирева")
    shop.add_product(Product("name", 100))
    shop.add_product(Product("name", 100))
    assert (
        shop.name == "У Балакирева"
    ), "атрибут name объекта класса SuperShop содержит некорректное значение"

    for p in shop.goods:
        assert p.price == 100, "дескриптор price вернул неверное значение"
        assert p.name == "name", "дескриптор name вернул неверное значение"

    t = Product("name 123", 1000)
    shop.add_product(t)
    shop.remove_product(t)
    assert (
        len(shop.goods) == 2
    ), "неверное количество товаров: возможно некорректно работают методы add_product и remove_product"

    assert hasattr(shop.goods[0], "name") and hasattr(shop.goods[0], "price")

    t = Product(1000, "name 123")
    if hasattr(t, "_name"):
        assert type(t.name) == str, "типы поля name должнен быть str"
    if hasattr(t, "_price"):
        assert type(t.price) in (
            int,
            float,
        ), "тип поля price должнен быть int или float"


tests()