from decimal import Decimal

from django.test import TestCase

from oscar.apps.offer import models
from oscar.apps.basket.models import Basket
from oscar.test.helpers import create_product
from tests.unit.offer import OfferTest


class CountConditionTest(OfferTest):

    def setUp(self):
        super(CountConditionTest, self).setUp()
        self.cond = models.CountCondition(range=self.range, type="Count", value=2)

    def test_empty_basket_fails_condition(self):
        self.assertFalse(self.cond.is_satisfied(self.basket))

    def test_not_discountable_product_fails_condition(self):
        prod1, prod2 = create_product(), create_product()
        prod2.is_discountable = False
        prod2.save()
        self.basket.add_product(prod1)
        self.basket.add_product(prod2)
        self.assertFalse(self.cond.is_satisfied(self.basket))

    def test_empty_basket_fails_partial_condition(self):
        self.assertFalse(self.cond.is_partially_satisfied(self.basket))

    def test_smaller_quantity_basket_passes_partial_condition(self):
        self.basket.add_product(create_product(), 1)
        self.assertTrue(self.cond.is_partially_satisfied(self.basket))

    def test_smaller_quantity_basket_upsell_message(self):
        self.basket.add_product(create_product(), 1)
        self.assertTrue('Buy 1 more product from ' in
                        self.cond.get_upsell_message(self.basket))

    def test_matching_quantity_basket_fails_partial_condition(self):
        self.basket.add_product(create_product(), 2)
        self.assertFalse(self.cond.is_partially_satisfied(self.basket))

    def test_matching_quantity_basket_passes_condition(self):
        self.basket.add_product(create_product(), 2)
        self.assertTrue(self.cond.is_satisfied(self.basket))

    def test_greater_quantity_basket_passes_condition(self):
        self.basket.add_product(create_product(), 3)
        self.assertTrue(self.cond.is_satisfied(self.basket))

    def test_consumption(self):
        self.basket.add_product(create_product(), 3)
        self.cond.consume_items(self.basket)
        self.assertEquals(1, self.basket.all_lines()[0].quantity_without_discount)

    def test_is_satisfied_accounts_for_consumed_items(self):
        self.basket.add_product(create_product(), 3)
        self.cond.consume_items(self.basket)
        self.assertFalse(self.cond.is_satisfied(self.basket))

    def test_count_condition_is_applied_multpile_times(self):
        benefit = models.AbsoluteDiscountBenefit(range=self.range, type="Absolute", value=Decimal('10.00'))
        for i in range(10):
            self.basket.add_product(create_product(price=Decimal('5.00'), upc='upc_%i' % i), 1)
        product_range = models.Range.objects.create(name="All products", includes_all_products=True)
        condition = models.CountCondition(range=product_range, type="Count", value=2)

        first_discount = benefit.apply(self.basket, condition=condition)
        self.assertEquals(Decimal('10.00'), first_discount)

        second_discount = benefit.apply(self.basket, condition=condition)
        self.assertEquals(Decimal('10.00'), second_discount)


class ValueConditionTest(OfferTest):
    def setUp(self):
        super(ValueConditionTest, self).setUp()
        self.cond = models.ValueCondition(range=self.range, type="Value", value=Decimal('10.00'))
        self.item = create_product(price=Decimal('5.00'))
        self.expensive_item = create_product(price=Decimal('15.00'))

    def test_empty_basket_fails_condition(self):
        self.assertFalse(self.cond.is_satisfied(self.basket))

    def test_empty_basket_fails_partial_condition(self):
        self.assertFalse(self.cond.is_partially_satisfied(self.basket))

    def test_less_value_basket_fails_condition(self):
        self.basket.add_product(self.item, 1)
        self.assertFalse(self.cond.is_satisfied(self.basket))

    def test_not_discountable_item_fails_condition(self):
        self.expensive_item.is_discountable = False
        self.expensive_item.save()
        self.basket.add_product(self.expensive_item, 1)
        self.assertFalse(self.cond.is_satisfied(self.basket))

    def test_upsell_message(self):
        self.basket.add_product(self.item, 1)
        self.assertTrue('Spend' in self.cond.get_upsell_message(self.basket))

    def test_matching_basket_fails_partial_condition(self):
        self.basket.add_product(self.item, 2)
        self.assertFalse(self.cond.is_partially_satisfied(self.basket))

    def test_less_value_basket_passes_partial_condition(self):
        self.basket.add_product(self.item, 1)
        self.assertTrue(self.cond.is_partially_satisfied(self.basket))

    def test_matching_basket_passes_condition(self):
        self.basket.add_product(self.item, 2)
        self.assertTrue(self.cond.is_satisfied(self.basket))

    def test_greater_than_basket_passes_condition(self):
        self.basket.add_product(self.item, 3)
        self.assertTrue(self.cond.is_satisfied(self.basket))

    def test_consumption(self):
        self.basket.add_product(self.item, 3)
        self.cond.consume_items(self.basket)
        self.assertEquals(1, self.basket.all_lines()[0].quantity_without_discount)

    def test_consumption_with_high_value_product(self):
        self.basket.add_product(self.expensive_item, 1)
        self.cond.consume_items(self.basket)
        self.assertEquals(0, self.basket.all_lines()[0].quantity_without_discount)

    def test_is_consumed_respects_quantity_consumed(self):
        self.basket.add_product(self.expensive_item, 1)
        self.assertTrue(self.cond.is_satisfied(self.basket))
        self.cond.consume_items(self.basket)
        self.assertFalse(self.cond.is_satisfied(self.basket))


class CoverageConditionTest(TestCase):

    def setUp(self):
        self.products = [create_product(Decimal('5.00')), create_product(Decimal('10.00'))]
        self.range = models.Range.objects.create(name="Some products")
        for product in self.products:
            self.range.included_products.add(product)
            self.range.included_products.add(product)

        self.basket = Basket.objects.create()
        self.cond = models.CoverageCondition(range=self.range, type="Coverage", value=2)

    def test_empty_basket_fails(self):
        self.assertFalse(self.cond.is_satisfied(self.basket))

    def test_empty_basket_fails_partial_condition(self):
        self.assertFalse(self.cond.is_partially_satisfied(self.basket))

    def test_single_item_fails(self):
        self.basket.add_product(self.products[0])
        self.assertFalse(self.cond.is_satisfied(self.basket))

    def test_not_discountable_item_fails(self):
        self.products[0].is_discountable = False
        self.products[0].save()
        self.basket.add_product(self.products[0])
        self.basket.add_product(self.products[1])
        self.assertFalse(self.cond.is_satisfied(self.basket))

    def test_single_item_passes_partial_condition(self):
        self.basket.add_product(self.products[0])
        self.assertTrue(self.cond.is_partially_satisfied(self.basket))

    def test_upsell_message(self):
        self.basket.add_product(self.products[0])
        self.assertTrue('Buy 1 more' in self.cond.get_upsell_message(self.basket))

    def test_duplicate_item_fails(self):
        self.basket.add_product(self.products[0])
        self.basket.add_product(self.products[0])
        self.assertFalse(self.cond.is_satisfied(self.basket))

    def test_duplicate_item_passes_partial_condition(self):
        self.basket.add_product(self.products[0], 2)
        self.assertTrue(self.cond.is_partially_satisfied(self.basket))

    def test_covering_items_pass(self):
        self.basket.add_product(self.products[0])
        self.basket.add_product(self.products[1])
        self.assertTrue(self.cond.is_satisfied(self.basket))

    def test_covering_items_fail_partial_condition(self):
        self.basket.add_product(self.products[0])
        self.basket.add_product(self.products[1])
        self.assertFalse(self.cond.is_partially_satisfied(self.basket))

    def test_covering_items_are_consumed(self):
        self.basket.add_product(self.products[0])
        self.basket.add_product(self.products[1])
        self.cond.consume_items(self.basket)
        self.assertEquals(0, self.basket.num_items_without_discount)

    def test_consumed_items_checks_affected_items(self):
        # Create new offer
        range = models.Range.objects.create(name="All products", includes_all_products=True)
        cond = models.CoverageCondition(range=range, type="Coverage", value=2)

        # Get 4 distinct products in the basket
        self.products.extend([create_product(Decimal('15.00')), create_product(Decimal('20.00'))])

        for product in self.products:
            self.basket.add_product(product)

        self.assertTrue(cond.is_satisfied(self.basket))
        cond.consume_items(self.basket)
        self.assertEquals(2, self.basket.num_items_without_discount)

        self.assertTrue(cond.is_satisfied(self.basket))
        cond.consume_items(self.basket)
        self.assertEquals(0, self.basket.num_items_without_discount)