from django.urls import reverse

from oscar.core.loading import get_model
from oscar.test import factories
from oscar.test.testcases import WebTestCase

from . import (
    CheckoutMixin, IndexViewPreConditionsMixin, PaymentDetailsPreviewViewMixin,
    PaymentDetailsViewMixin, PaymentMethodViewMixin, ShippingAddressViewMixin,
    ShippingMethodViewMixin)

Order = get_model('order', 'Order')
UserAddress = get_model('address', 'UserAddress')


class LoginRequiredMixin:

    view_name = None
    view_url = None

    def test_requires_login(self):
        response = self.get(self.view_url or reverse(self.view_name), user=None)
        expected_url = '{login_url}?next={forward}'.format(
            login_url=reverse('customer:login'),
            forward=self.view_url or reverse(self.view_name))
        self.assertRedirects(response, expected_url)


class TestIndexView(LoginRequiredMixin, IndexViewPreConditionsMixin, CheckoutMixin, WebTestCase):

    view_name = 'checkout:index'

    def test_redirects_customers_to_shipping_address_view(self):
        self.add_product_to_basket()
        response = self.get(reverse('checkout:index'))
        self.assertRedirectsTo(response, 'checkout:shipping-address')


class TestShippingAddressView(LoginRequiredMixin, ShippingAddressViewMixin, CheckoutMixin, WebTestCase):

    view_name = 'checkout:shipping-address'
    next_view_name = 'checkout:shipping-method'

    def setUp(self):
        super().setUp()
        self.user_address = factories.UserAddressFactory(user=self.user, country=self.create_shipping_country())

    def test_only_shipping_addresses_are_shown(self):
        not_shipping_country = factories.CountryFactory(
            iso_3166_1_a2='US', name="UNITED STATES",
            is_shipping_country=False)
        not_shipping_address = factories.UserAddressFactory(
            user=self.user, country=not_shipping_country, line4='New York')
        self.add_product_to_basket()
        page = self.get(reverse('checkout:shipping-address'))
        page.mustcontain(
            self.user_address.line4, self.user_address.country.name,
            no=[not_shipping_address.country.name, not_shipping_address.line4])

    def test_can_select_an_existing_shipping_address(self):
        self.add_product_to_basket()
        page = self.get(reverse('checkout:shipping-address'), user=self.user)
        self.assertIsOk(page)
        form = page.forms["select_shipping_address_%s" % self.user_address.id]
        response = form.submit()
        self.assertRedirectsTo(response, 'checkout:shipping-method')


class TestUserAddressUpdateView(LoginRequiredMixin, CheckoutMixin, WebTestCase):

    def setUp(self):
        super().setUp()
        user_address = factories.UserAddressFactory(user=self.user, country=self.create_shipping_country())
        self.view_url = reverse('checkout:user-address-update', kwargs={'pk': user_address.pk})

    def test_submitting_valid_form_modifies_user_address(self):
        page = self.get(self.view_url, user=self.user)
        form = page.forms['update_user_address']
        form['first_name'] = 'Tom'
        response = form.submit()
        self.assertRedirectsTo(response, 'checkout:shipping-address')
        self.assertEqual('Tom', UserAddress.objects.get().first_name)


class TestUserAddressDeleteView(LoginRequiredMixin, CheckoutMixin, WebTestCase):

    def setUp(self):
        super().setUp()
        self.user_address = factories.UserAddressFactory(user=self.user, country=self.create_shipping_country())
        self.view_url = reverse('checkout:user-address-delete', kwargs={'pk': self.user_address.pk})

    def test_can_delete_a_user_address_from_shipping_address_page(self):
        self.add_product_to_basket()
        page = self.get(reverse('checkout:shipping-address'), user=self.user)
        delete_confirm = page.click(href=self.view_url)
        form = delete_confirm.forms["delete_address_%s" % self.user_address.id]
        form.submit()

        # Ensure address is deleted
        user_addresses = UserAddress.objects.filter(user=self.user)
        self.assertEqual(0, len(user_addresses))


class TestShippingMethodView(LoginRequiredMixin, ShippingMethodViewMixin, CheckoutMixin, WebTestCase):

    view_name = 'checkout:shipping-method'
    next_view_name = 'checkout:payment-method'


class TestPaymentMethodView(LoginRequiredMixin, PaymentMethodViewMixin, CheckoutMixin, WebTestCase):

    view_name = 'checkout:payment-method'


class TestPaymentDetailsView(LoginRequiredMixin, PaymentDetailsViewMixin, CheckoutMixin, WebTestCase):

    view_name = 'checkout:payment-details'


class TestPaymentDetailsPreviewView(LoginRequiredMixin, PaymentDetailsPreviewViewMixin, CheckoutMixin, WebTestCase):

    view_name = 'checkout:preview'


class TestThankYouView(CheckoutMixin, WebTestCase):

    def tests_gets_a_302_when_there_is_no_order(self):
        response = self.get(
            reverse('checkout:thank-you'), user=self.user, status="*")
        self.assertIsRedirect(response)
        self.assertRedirectsTo(response, 'catalogue:index')

    def tests_gets_a_302_when_the_order_id_in_the_session_is_for_a_non_existent_order(self):
        session = self.client.session
        # Put the order ID in the session, mimicking an order that no longer
        # exists, so that we can be redirected to the home page.
        session['checkout_order_id'] = 0
        session.save()

        self.client.force_login(self.user)
        response = self.client.get(reverse('checkout:thank-you'))
        self.assertRedirects(response, reverse('catalogue:index'))

    def tests_custumers_can_reach_the_thank_you_page(self):
        self.add_product_to_basket()
        self.enter_shipping_address()
        thank_you = self.place_order()
        self.assertIsOk(thank_you)

    def test_superusers_can_force_an_order(self):
        self.add_product_to_basket()
        self.enter_shipping_address()
        self.place_order()
        user = self.create_user('admin', 'admin@admin.com')
        user.is_superuser = True
        user.save()
        order = Order.objects.get()

        test_url = '%s?order_number=%s' % (
            reverse('checkout:thank-you'), order.number)
        response = self.get(test_url, status='*', user=user)
        self.assertIsOk(response)

        test_url = '%s?order_id=%s' % (reverse('checkout:thank-you'), order.pk)
        response = self.get(test_url, status='*', user=user)
        self.assertIsOk(response)

    def test_superusers_cannot_force_a_non_existent_order(self):
        user = self.create_user('admin', 'admin@admin.com')
        user.is_superuser = True
        user.save()

        test_url = '%s?order_number=%s' % (reverse('checkout:thank-you'), 'non-existent')
        response = self.get(test_url, status='*', user=user)
        self.assertIsRedirect(response)
        self.assertRedirectsTo(response, 'catalogue:index')

        test_url = '%s?order_id=%s' % (reverse('checkout:thank-you'), 0)
        response = self.get(test_url, status='*', user=user)
        self.assertIsRedirect(response)
        self.assertRedirectsTo(response, 'catalogue:index')

    def test_users_cannot_force_an_other_customer_order(self):
        self.add_product_to_basket()
        self.enter_shipping_address()
        self.place_order()
        user = self.create_user('John', 'john@test.com')
        user.save()
        order = Order.objects.get()

        test_url = '%s?order_number=%s' % (
            reverse('checkout:thank-you'), order.number)
        response = self.get(test_url, status='*', user=user)
        self.assertIsRedirect(response)
        self.assertRedirectsTo(response, 'catalogue:index')

        test_url = '%s?order_id=%s' % (reverse('checkout:thank-you'), order.pk)
        response = self.get(test_url, status='*', user=user)
        self.assertIsRedirect(response)
        self.assertRedirectsTo(response, 'catalogue:index')