from oscar.apps.offer import models


class AlphabetRange(object):
    name = "Products that start with D"

    def contains_product(self, product):
        return product.title.startswith('D')

    def num_products(self):
        return None


class BasketOwnerCalledBarry(models.Condition):
    name = "User must be called barry"

    class Meta:
        proxy = True

    def is_satisfied(self, basket):
        if not basket.owner:
            return False
        return basket.owner.first_name.lower() == 'barry'

    def can_apply_condition(self, product):
        return False

    def consume_items(self, basket, affected_lines):
        return


class ChangesOwnerName(models.Benefit):

    class Meta:
        proxy = True

    def apply(self, basket, condition, offer=None):
        condition.consume_items(basket, ())
        return models.PostOrderAction(
            "You will have your name changed to Barry!")

    def apply_deferred(self, basket, order, application):
        if basket.owner:
            basket.owner.first_name = "Barry"
            basket.owner.save()
            return "Name changed to Barry!"
        return "We tried to apply benefit but couldn't"

    @property
    def description(self):
        return "Changes owners name"