from decimal import Decimal as D

from django.test import TestCase

from oscar.apps.offer import models, utils
from oscar.apps.shipping.repository import Repository
from oscar.apps.shipping.models import WeightBased
from oscar.test.basket import add_product
from oscar.test import factories


def create_offer():
    range = models.Range.objects.create(
        name="All products", includes_all_products=True)
    condition = models.CountCondition.objects.create(
        range=range,
        type=models.Condition.COUNT,
        value=1)
    benefit = models.ShippingFixedPriceBenefit.objects.create(
        type=models.Benefit.SHIPPING_FIXED_PRICE,
        value=D('1.00'))
    return models.ConditionalOffer.objects.create(
        condition=condition,
        benefit=benefit,
        offer_type=models.ConditionalOffer.SITE)


class TestWeightBasedShippingBenefit(TestCase):

    def setUp(self):
        product = factories.create_product(attributes={'weight': 5}, num_in_stock=10)
        factories.create_shipping_weight_band(10, 10)
        self.basket = factories.create_basket(empty=True)
        self.basket.add_product(product)
        self.offer = create_offer()

    def test_has_discount_recorded_correctly_when_order_is_placed(self):
        add_product(self.basket, D('12.00'), 1)
        utils.Applicator().apply(self.basket)
        self.assertEqual(1, len(self.basket.offer_applications))

        shipping_method = WeightBased.objects.first()
        shipping_method = Repository().apply_shipping_offer(
            self.basket, shipping_method, self.offer)
        order = factories.create_order(basket=self.basket,
                                       shipping_method=shipping_method)

        discounts = order.discounts.all()
        self.assertEqual(1, len(discounts))

        discount = discounts[0]
        self.assertTrue(discount.is_shipping_discount)
        self.assertEqual(D('9.00'), discount.amount)