from django.test import TestCase
from django.contrib.auth import get_user_model
from datetime import datetime, date, timedelta
from django.utils import timezone

from .models import *
from uncloud_service.models import GenericServiceProduct


class ProductTestCase(TestCase):
    """
    Test products and products <-> order interaction
    """

    def setUp(self):
        self.user = get_user_model().objects.create(
            username='random_user',
            email='jane.random@domain.tld')

        self.ba = BillingAddress.objects.create(
            owner=self.user,
            organization = 'Test org',
            street="unknown",
            city="unknown",
            postal_code="somewhere else",
            active=True)

    def test_create_one_time_product(self):
        """
        One time payment products cannot be updated - can they?
        """

        p = SampleOneTimeProduct.objects.create(owner=self.user)

        self.assertEqual(p.one_time_price, 5)
        self.assertEqual(p.recurring_price, 0)

    def test_create_product_without_active_billing_address(self):
        """
        Fail to create a product without an active billing address
        """

        self.ba.active = False
        self.ba.save()

        with self.assertRaises(ValidationError):
            p = SampleOneTimeProduct.objects.create(owner=self.user)

    def test_create_product_without_billing_address(self):
        """
        Fail to create a product without a billing address
        """

        user2 = get_user_model().objects.create(
            username='random_user2',
            email='jane.randomly@domain.tld')

        with self.assertRaises(ValidationError):
            p = SampleOneTimeProduct.objects.create(owner=user2)


    def test_create_order_creates_correct_order_count(self):
        """
        Ensure creating orders from product only creates 1 order
        """

        # One order
        p = SampleOneTimeProduct.objects.create(owner=self.user)
        p.create_order(timezone.make_aware(datetime.datetime(2020,3,3)))

        order_count = Order.objects.filter(owner=self.user).count()
        self.assertEqual(order_count, 1)

        # One more order
        p = SampleRecurringProduct.objects.create(owner=self.user)
        p.create_order(timezone.make_aware(datetime.datetime(2020,3,3)))

        order_count = Order.objects.filter(owner=self.user).count()
        self.assertEqual(order_count, 2)

        # Should create 2 orders
        p = SampleRecurringProductOneTimeFee.objects.create(owner=self.user)
        p.create_order(timezone.make_aware(datetime.datetime(2020,3,3)))

        order_count = Order.objects.filter(owner=self.user).count()
        self.assertEqual(order_count, 4)


    def test_update_recurring_order(self):
        """
        Ensure creating orders from product only creates 1 order
        """

        p = SampleRecurringProduct.objects.create(owner=self.user)
        p.create_order(timezone.make_aware(datetime.datetime(2020,3,3)))

        p.create_or_update_recurring_order(timezone.make_aware(datetime.datetime(2020,3,4)))

        # FIXME: where is the assert?


class BillingAddressTestCase(TestCase):
    def setUp(self):
        self.user = get_user_model().objects.create(
            username='random_user',
            email='jane.random@domain.tld')


    def test_user_no_address(self):
        """
        Raise an error, when there is no address
        """

        self.assertRaises(uncloud_pay.models.BillingAddress.DoesNotExist,
                          BillingAddress.get_address_for,
                          self.user)

    def test_user_only_inactive_address(self):
        """
        Raise an error, when there is no active address
        """

        ba = BillingAddress.objects.create(
            owner=self.user,
            organization = 'Test org',
            street="unknown",
            city="unknown",
            postal_code="somewhere else",
            active=False)

        self.assertRaises(uncloud_pay.models.BillingAddress.DoesNotExist,
                          BillingAddress.get_address_for,
                          self.user)

    def test_find_active_address(self):
        """
        Find the active address
        """

        ba = BillingAddress.objects.create(
            owner=self.user,
            organization = 'Test org',
            street="unknown",
            city="unknown",
            postal_code="unknown",
            active=True)


        self.assertEqual(BillingAddress.get_address_for(self.user), ba)

    def test_find_right_address_with_multiple_addresses(self):
        """
        Find the active address only, skip inactive
        """

        ba = BillingAddress.objects.create(
            owner=self.user,
            organization = 'Test org',
            street="unknown",
            city="unknown",
            postal_code="unknown",
            active=True)

        ba2 = BillingAddress.objects.create(
            owner=self.user,
            organization = 'Test org',
            street="unknown",
            city="unknown",
            postal_code="somewhere else",
            active=False)


        self.assertEqual(BillingAddress.get_address_for(self.user), ba)

    def test_change_addresses(self):
        """
        Switch the active address
        """

        ba = BillingAddress.objects.create(
            owner=self.user,
            organization = 'Test org',
            street="unknown",
            city="unknown",
            postal_code="unknown",
            active=True)

        self.assertEqual(BillingAddress.get_address_for(self.user), ba)

        ba.active=False
        ba.save()

        ba2 = BillingAddress.objects.create(
            owner=self.user,
            organization = 'Test org',
            street="unknown",
            city="unknown",
            postal_code="somewhere else",
            active=True)

        self.assertEqual(BillingAddress.get_address_for(self.user), ba2)



class BillTestCase(TestCase):
    def setUp(self):
        self.user_without_address = get_user_model().objects.create(
            username='no_home_person',
            email='far.away@domain.tld')

        self.user = get_user_model().objects.create(
            username='jdoe',
            email='john.doe@domain.tld')

        self.recurring_user = get_user_model().objects.create(
            username='recurrent_product_user',
            email='jane.doe@domain.tld')

        self.user_addr = BillingAddress.objects.create(
            owner=self.user,
            organization = 'Test org',
            street="unknown",
            city="unknown",
            postal_code="unknown",
            active=True)

        self.recurring_user_addr = BillingAddress.objects.create(
            owner=self.recurring_user,
            organization = 'Test org',
            street="Somewhere",
            city="Else",
            postal_code="unknown",
            active=True)

        self.order_meta = {}
        self.order_meta[1] = {
            'starting_date': timezone.make_aware(datetime.datetime(2020,3,3)),
            'ending_date': timezone.make_aware(datetime.datetime(2020,4,17)),
            'price': 15,
            'description': 'One chocolate bar'
        }

        self.one_time_order = Order.objects.create(
                owner=self.user,
                starting_date=self.order_meta[1]['starting_date'],
                ending_date=self.order_meta[1]['ending_date'],
                recurring_period=RecurringPeriod.ONE_TIME,
                price=self.order_meta[1]['price'],
                description=self.order_meta[1]['description'],
                billing_address=BillingAddress.get_address_for(self.user))

        self.recurring_order = Order.objects.create(
                owner=self.recurring_user,
                starting_date=timezone.make_aware(datetime.datetime(2020,3,3)),
                recurring_period=RecurringPeriod.PER_30D,
                price=15,
                description="A pretty VM",
                billing_address=BillingAddress.get_address_for(self.recurring_user)
        )

        # used for generating multiple bills
        self.bill_dates = [
            timezone.make_aware(datetime.datetime(2020,3,31)),
            timezone.make_aware(datetime.datetime(2020,4,30)),
            timezone.make_aware(datetime.datetime(2020,5,31)),
        ]



    def test_bill_one_time_one_bill_record(self):
        """
        Ensure there is only 1 bill record per order
        """

        bill = Bill.create_next_bill_for_user_address(self.user_addr)

        self.assertEqual(self.one_time_order.billrecord_set.count(), 1)

    def test_bill_sum_onetime(self):
        """
        Check the bill sum for a single one time order
        """

        bill = Bill.create_next_bill_for_user_address(self.user_addr)
        self.assertEqual(bill.sum, self.order_meta[1]['price'])


    def test_bill_creates_record_for_recurring_order(self):
        """
        Ensure there is only 1 bill record per order
        """

        bill = Bill.create_next_bill_for_user_address(self.recurring_user_addr)

        self.assertEqual(self.recurring_order.billrecord_set.count(), 1)
        self.assertEqual(bill.billrecord_set.count(), 1)


    def test_new_bill_after_closing(self):
        """
        After closing a bill and the user has a recurring product,
        the next bill run should create e new bill
        """

        for ending_date in self.bill_dates:
            b = Bill.create_next_bill_for_user_address(self.recurring_user_addr, ending_date)
            b.close()

        bill_count = Bill.objects.filter(owner=self.recurring_user).count()

        self.assertEqual(len(self.bill_dates), bill_count)

    def test_multi_addr_multi_bill(self):
        """
        Ensure multiple bills are created if orders exist with different billing addresses
        """

        username="lotsofplaces"
        multi_addr_user = get_user_model().objects.create(
            username=username,
            email=f"{username}@example.org")

        user_addr1 = BillingAddress.objects.create(
            owner=multi_addr_user,
            organization = 'Test org',
            street="unknown",
            city="unknown",
            postal_code="unknown",
            active=True)

        order1 = Order.objects.create(
                owner=multi_addr_user,
                starting_date=self.order_meta[1]['starting_date'],
                ending_date=self.order_meta[1]['ending_date'],
                recurring_period=RecurringPeriod.ONE_TIME,
                price=self.order_meta[1]['price'],
                description=self.order_meta[1]['description'],
                billing_address=BillingAddress.get_address_for(self.user))

        # Make this address inactive
        user_addr1.active = False
        user_addr1.save()

        user_addr2 = BillingAddress.objects.create(
            owner=multi_addr_user,
            organization = 'Test2 org',
            street="unknown2",
            city="unknown2",
            postal_code="unknown2",
            active=True)

        order2 = Order.objects.create(
                owner=multi_addr_user,
                starting_date=self.order_meta[1]['starting_date'],
                ending_date=self.order_meta[1]['ending_date'],
                recurring_period=RecurringPeriod.ONE_TIME,
                price=self.order_meta[1]['price'],
                description=self.order_meta[1]['description'],
                billing_address=BillingAddress.get_address_for(self.user))


        bills = Bill.create_next_bills_for_user(multi_addr_user)

        self.assertEqual(len(bills), 2)


    # TO BE IMPLEMENTED -- once orders can be marked as "done" / "inactive" / "not for billing"
    # def test_skip_disabled_orders(self):
    #     """
    #     Ensure that a bill only considers "active" orders
    #     """

    #     self.assertEqual(1, 2)


class ModifyProductTestCase(TestCase):
    def setUp(self):
        self.user = get_user_model().objects.create(
            username='random_user',
            email='jane.random@domain.tld')

        self.ba = BillingAddress.objects.create(
            owner=self.user,
            organization = 'Test org',
            street="unknown",
            city="unknown",
            postal_code="somewhere else",
            active=True)

    def test_no_pro_rata_first_bill(self):
        """
        The bill should NOT contain a partial amount -- this is a BILL TEST :-)
        """

        price = 5

        # Standard 30d recurring product
        product = SampleRecurringProduct.objects.create(owner=self.user,
                                                        rc_price=price)

        starting_date = timezone.make_aware(datetime.datetime(2020,3,3))
        ending_date   = timezone.make_aware(datetime.datetime(2020,3,31))
        time_diff     = (ending_date - starting_date).total_seconds()

        product.create_order(starting_date)

        bills = Bill.create_next_bills_for_user(self.user,
                                                ending_date=ending_date)


        # We expect 1 bill for 1 billing address and 1 time frame
        self.assertEqual(len(bills), 1)

        pro_rata_amount = time_diff / product.default_recurring_period.value

        self.assertNotEqual(bills[0].sum, pro_rata_amount * price)
        self.assertEqual(bills[0].sum, price)


    def test_downgrade_product(self):
        """
        Test downgrading behaviour:

        We create a recurring product (recurring time: 30 days) and downgrade after 15 days.

        We create the bill right AFTER the end of the first order.

        Expected result:

        - First bill record for 30 days
        - Second bill record starting after 30 days
        - Bill contains two bill records

        """

        user = self.user



        starting_price = 10
        downgrade_price = 5


        starting_date = timezone.make_aware(datetime.datetime(2019,3,3))
        first_order_should_end_at = starting_date + datetime.timedelta(days=30)
        change1_date  = start_after(starting_date + datetime.timedelta(days=15))
        bill_ending_date = change1_date + datetime.timedelta(days=1)


        product = SampleRecurringProduct.objects.create(owner=user, rc_price=starting_price)
        product.create_order(starting_date)

        product.rc_price = downgrade_price
        product.save()
        product.create_or_update_recurring_order(when_to_start=change1_date)

        bills = Bill.create_next_bills_for_user(user, ending_date=bill_ending_date)

        bill = bills[0]
        bill_records = BillRecord.objects.filter(bill=bill)

        self.assertEqual(len(bill_records), 2)

        self.assertEqual(bill_records[0].starting_date, starting_date)

        self.assertEqual(bill_records[0].order.ending_date, first_order_should_end_at)

        # self.assertEqual(bill_records[0].ending_date, first_order_should_end_at)

        # self.assertEqual(bill_records[0].quantity, 1)

        # self.assertEqual(bill_records[1].quantity, 1)
        # self.assertEqual(int(bill.sum), 15)

    def test_upgrade_product(self):
        """
        Test upgrading behaviour
        """

        user = self.user

        # Create product
        starting_date = timezone.make_aware(datetime.datetime(2019,3,3))
        starting_price = 10
        product = SampleRecurringProduct.objects.create(owner=user, rc_price=starting_price)
        product.create_order(starting_date)

        change1_date  = start_after(starting_date + datetime.timedelta(days=15))
        product.rc_price = 20
        product.save()
        product.create_or_update_recurring_order(when_to_start=change1_date)

        bill_ending_date = change1_date + datetime.timedelta(days=1)
        bills = Bill.create_next_bills_for_user(user, ending_date=bill_ending_date)

        bill = bills[0]
        bill_records = BillRecord.objects.filter(bill=bill)

        self.assertEqual(len(bill_records), 2)
        self.assertEqual(bill_records[0].quantity, .5)

        self.assertEqual(bill_records[0].ending_date, end_before(change1_date))

        self.assertEqual(bill_records[1].quantity, 1)
        self.assertEqual(bill_records[1].starting_date, change1_date)

        self.assertEqual(int(bill.sum), 25)



    # def test_bill_for_increasing_product(self):
    #     """
    #     Modify a product, see one pro rata entry
    #     """

    #     # Create product
    #     starting_date = timezone.make_aware(datetime.datetime(2019,3,3))
    #     starting_price = 30.5
    #     product = SampleRecurringProduct.objects.create(owner=self.user,
    #                                                     rc_price=starting_price)
    #     product.create_order(starting_date)

    #     recurring_period = product.default_recurring_period.value

    #     # First change
    #     change1_date  = timezone.make_aware(datetime.datetime(2019,4,17))
    #     product.rc_price = 49.5
    #     product.save()
    #     product.create_or_update_recurring_order(when_to_start=change1_date)

    #     # Second change
    #     change2_date  = timezone.make_aware(datetime.datetime(2019,5,8))
    #     product.rc_price = 56.5
    #     product.save()
    #     product.create_or_update_recurring_order(when_to_start=change2_date)

    #     # Create bill one month after 2nd change
    #     bill_ending_date = timezone.make_aware(datetime.datetime(2019,6,30))
    #     bills = Bill.create_next_bills_for_user(self.user,
    #                                             ending_date=bill_ending_date)

    #     # only one bill in this test case
    #     bill = bills[0]

    #     expected_amount = starting_price

    #     d2 = starting_date + recurring_period
    #     duration2 = change1_date - d2

    #     expected_amount = 0

    #     # Expected bill sum & records:
    #     # 2019-03-03 - 2019-04-02 +30d:  30.5
    #     # 2019-04-02 - 2019-04-17: +15d: 15.25
    #     # 2019-04-17 - 2019-05-08: +21d: (21/30) * 49.5
    #     # 2019-05-08 - 2019-06-07: +30d: 56.5
    #     # 2019-06-07 - 2019-07-07: +30d: 56.5


    #     self.assertEqual(bills[0].sum, price)

    #     # expeted result:
    #     # 1x 5 chf bill record
    #     # 1x 5 chf  bill record
    #     # 1x 10 partial bill record



# class NotABillingTC(TestCase):
# #class BillingTestCase(TestCase):
#     def setUp(self):
#         self.user = get_user_model().objects.create(
#                 username='jdoe',
#                 email='john.doe@domain.tld')
#         self.billing_address = BillingAddress.objects.create(
#                 owner=self.user,
#                 street="unknown",
#                 city="unknown",
#                 postal_code="unknown")

#     def test_basic_monthly_billing(self):
#         one_time_price = 10
#         recurring_price = 20
#         description = "Test Product 1"

#         # Three months: full, full, partial.
# #        starting_date = datetime.fromisoformat('2020-03-01')
#         starting_date = datetime(2020,3,1)
#         ending_date   = datetime(2020,5,8)

#         # Create order to be billed.
#         order = Order.objects.create(
#                 owner=self.user,
#                 starting_date=starting_date,
#                 ending_date=ending_date,
#                 recurring_period=RecurringPeriod.PER_30D,
#                 recurring_price=recurring_price,
#                 one_time_price=one_time_price,
#                 description=description,
#                 billing_address=self.billing_address)

#         # Generate & check bill for first month: full recurring_price + setup.
#         first_month_bills = order.generate_initial_bill()
#         self.assertEqual(len(first_month_bills), 1)
#         self.assertEqual(first_month_bills[0].amount, one_time_price + recurring_price)

#         # Generate & check bill for second month: full recurring_price.
#         second_month_bills = Bill.generate_for(2020, 4, self.user)
#         self.assertEqual(len(second_month_bills), 1)
#         self.assertEqual(second_month_bills[0].amount, recurring_price)

#         # Generate & check bill for third and last month: partial recurring_price.
#         third_month_bills = Bill.generate_for(2020, 5, self.user)
#         self.assertEqual(len(third_month_bills), 1)
#         # 31 days in May.
#         self.assertEqual(float(third_month_bills[0].amount),
#                 round(round((7/31), AMOUNT_DECIMALS) * recurring_price, AMOUNT_DECIMALS))

#         # Check that running Bill.generate_for() twice does not create duplicates.
#         self.assertEqual(len(Bill.generate_for(2020, 3, self.user)), 0)

#     def test_basic_yearly_billing(self):
#         one_time_price = 10
#         recurring_price = 150
#         description = "Test Product 1"

#         starting_date = datetime.fromisoformat('2020-03-31T08:05:23')

#         # Create order to be billed.
#         order = Order.objects.create(
#                 owner=self.user,
#                 starting_date=starting_date,
#                 recurring_period=RecurringPeriod.PER_365D,
#                 recurring_price=recurring_price,
#                 one_time_price=one_time_price,
#                 description=description,
#                 billing_address=self.billing_address)

#         # Generate & check bill for first year: recurring_price + setup.
#         first_year_bills = order.generate_initial_bill()
#         self.assertEqual(len(first_year_bills), 1)
#         self.assertEqual(first_year_bills[0].starting_date.date(),
#                 date.fromisoformat('2020-03-31'))
#         self.assertEqual(first_year_bills[0].ending_date.date(),
#                 date.fromisoformat('2021-03-30'))
#         self.assertEqual(first_year_bills[0].amount,
#                 recurring_price + one_time_price)

#         # Generate & check bill for second year: recurring_price.
#         second_year_bills = Bill.generate_for(2021, 3, self.user)
#         self.assertEqual(len(second_year_bills), 1)
#         self.assertEqual(second_year_bills[0].starting_date.date(),
#                 date.fromisoformat('2021-03-31'))
#         self.assertEqual(second_year_bills[0].ending_date.date(),
#                 date.fromisoformat('2022-03-30'))
#         self.assertEqual(second_year_bills[0].amount, recurring_price)

#         # Check that running Bill.generate_for() twice does not create duplicates.
#         self.assertEqual(len(Bill.generate_for(2020, 3, self.user)), 0)
#         self.assertEqual(len(Bill.generate_for(2020, 4, self.user)), 0)
#         self.assertEqual(len(Bill.generate_for(2020, 2, self.user)), 0)
#         self.assertEqual(len(Bill.generate_for(2021, 3, self.user)), 0)

#     def test_basic_hourly_billing(self):
#         one_time_price = 10
#         recurring_price = 1.4
#         description = "Test Product 1"

#         starting_date = datetime.fromisoformat('2020-03-31T08:05:23')
#         ending_date   = datetime.fromisoformat('2020-04-01T11:13:32')

#         # Create order to be billed.
#         order = Order.objects.create(
#                 owner=self.user,
#                 starting_date=starting_date,
#                 ending_date=ending_date,
#                 recurring_period=RecurringPeriod.PER_HOUR,
#                 recurring_price=recurring_price,
#                 one_time_price=one_time_price,
#                 description=description,
#                 billing_address=self.billing_address)

#         # Generate & check bill for first month: recurring_price + setup.
#         first_month_bills = order.generate_initial_bill()
#         self.assertEqual(len(first_month_bills), 1)
#         self.assertEqual(float(first_month_bills[0].amount),
#                 round(16 * recurring_price, AMOUNT_DECIMALS) + one_time_price)

#         # Generate & check bill for first month: recurring_price.
#         second_month_bills = Bill.generate_for(2020, 4, self.user)
#         self.assertEqual(len(second_month_bills), 1)
#         self.assertEqual(float(second_month_bills[0].amount),
#                 round(12 * recurring_price, AMOUNT_DECIMALS))