import datetime

from django.test import TestCase
from django.utils.timezone import now

from oscar.apps.dashboard.offers import forms
from oscar.apps.offer.models import ConditionalOffer
from oscar.test.factories import ConditionalOfferFactory, VoucherFactory


class TestMetaDataForm(TestCase):

    def test_changing_offer_type_for_voucher_offer_without_vouchers(self):
        offer = ConditionalOfferFactory(offer_type=ConditionalOffer.VOUCHER)
        data = {
            'name': offer.name,
            'description': offer.description,
            'offer_type': ConditionalOffer.SITE,
        }
        form = forms.MetaDataForm(data, instance=offer)
        self.assertTrue(form.is_valid())

    def test_changing_offer_type_for_voucher_offer_with_vouchers(self):
        offer = ConditionalOfferFactory(offer_type=ConditionalOffer.VOUCHER)
        VoucherFactory().offers.add(offer)
        data = {
            'name': offer.name,
            'description': offer.description,
            'offer_type': ConditionalOffer.SITE,
        }
        form = forms.MetaDataForm(data, instance=offer)
        self.assertFalse(form.is_valid())
        self.assertEqual(form.errors['offer_type'][0],
                         "This can only be changed if it has no vouchers attached to it")


class TestRestrictionsFormEnforces(TestCase):

    def test_cronological_dates(self):
        start = now()
        end = start - datetime.timedelta(days=30)
        post = {'name': 'dummy',
                'description': 'dummy',
                'start_datetime': start,
                'end_datetime': end}
        form = forms.RestrictionsForm(post)
        self.assertFalse(form.is_valid())