/*
 * Copyright 2010-2011 Ning, Inc.
 *
 * Ning licenses this file to you under the Apache License, version 2.0
 * (the "License"); you may not use this file except in compliance with the
 * License.  You may obtain a copy of the License at:
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */

package com.ning.billing.junction.plumbing.billing;

import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.SortedSet;
import java.util.TreeSet;
import java.util.UUID;

import org.joda.time.DateTime;
import org.joda.time.DateTimeZone;
import org.mockito.Mockito;
import org.testng.Assert;
import org.testng.annotations.BeforeMethod;
import org.testng.annotations.BeforeSuite;
import org.testng.annotations.Test;

import com.ning.billing.account.api.Account;
import com.ning.billing.account.api.AccountApiException;
import com.ning.billing.account.api.AccountUserApi;
import com.ning.billing.catalog.MockCatalog;
import com.ning.billing.catalog.MockCatalogService;
import com.ning.billing.catalog.api.BillingAlignment;
import com.ning.billing.catalog.api.CatalogApiException;
import com.ning.billing.catalog.api.CatalogService;
import com.ning.billing.catalog.api.Currency;
import com.ning.billing.catalog.api.CurrencyValueNull;
import com.ning.billing.catalog.api.InternationalPrice;
import com.ning.billing.catalog.api.Plan;
import com.ning.billing.catalog.api.PlanPhase;
import com.ning.billing.catalog.api.Price;
import com.ning.billing.catalog.api.PriceList;
import com.ning.billing.catalog.api.PriceListSet;
import com.ning.billing.entitlement.api.SubscriptionTransitionType;
import com.ning.billing.entitlement.api.billing.BillingEvent;
import com.ning.billing.entitlement.api.billing.BillingModeType;
import com.ning.billing.entitlement.api.user.EffectiveSubscriptionEvent;
import com.ning.billing.entitlement.api.user.EntitlementUserApi;
import com.ning.billing.entitlement.api.user.EntitlementUserApiException;
import com.ning.billing.entitlement.api.user.Subscription;
import com.ning.billing.entitlement.api.user.Subscription.SubscriptionState;
import com.ning.billing.entitlement.api.user.SubscriptionBundle;
import com.ning.billing.junction.JunctionTestSuite;
import com.ning.billing.junction.api.BillingApi;
import com.ning.billing.junction.api.BillingEventSet;
import com.ning.billing.junction.api.Blockable;
import com.ning.billing.junction.api.BlockingApi;
import com.ning.billing.junction.api.BlockingState;
import com.ning.billing.junction.api.DefaultBlockingState;
import com.ning.billing.lifecycle.KillbillService.ServiceException;
import com.ning.billing.mock.MockEffectiveSubscriptionEvent;
import com.ning.billing.mock.MockSubscription;
import com.ning.billing.util.api.TagUserApi;
import com.ning.billing.util.callcontext.CallContextFactory;
import com.ning.billing.util.callcontext.DefaultCallContextFactory;
import com.ning.billing.util.clock.Clock;
import com.ning.billing.util.clock.ClockMock;
import com.ning.billing.util.dao.ObjectType;
import com.ning.billing.util.tag.ControlTagType;
import com.ning.billing.util.tag.Tag;

import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;
import static org.testng.Assert.assertEquals;
import static org.testng.Assert.assertNull;
import static org.testng.Assert.assertTrue;

public class TestBillingApi extends JunctionTestSuite {
    class MockPrice implements InternationalPrice {
        private final BigDecimal price;

        public MockPrice(final String val) {
            price = new BigDecimal(val);
        }

        @Override
        public boolean isZero() {
            return price.compareTo(BigDecimal.ZERO) == 0;
        }

        @Override
        public Price[] getPrices() {
            return new Price[]{
                    new Price() {
                        @Override
                        public Currency getCurrency() {
                            return Currency.USD;
                        }

                        @Override
                        public BigDecimal getValue() throws CurrencyValueNull {
                            return price;
                        }
                    }
            };
        }

        @Override
        public BigDecimal getPrice(final Currency currency) throws CatalogApiException {
            return price;
        }
    }

    private static final String DISABLED_BUNDLE = "disabled-bundle";
    private static final String CLEAR_BUNDLE = "clear-bundle";

    private static final UUID eventId = new UUID(0L, 0L);
    private static final UUID subId = new UUID(1L, 0L);
    private static final UUID bunId = new UUID(2L, 0L);

    private CatalogService catalogService;

    private List<EffectiveSubscriptionEvent> effectiveSubscriptionTransitions;
    private EntitlementUserApi entitlementApi;

    private final BlockingCalculator blockCalculator = new BlockingCalculator(null) {
        @Override
        public void insertBlockingEvents(final SortedSet<BillingEvent> billingEvents) {
        }
    };

    private Clock clock;
    private Subscription subscription;
    private DateTime subscriptionStartDate;
    private Plan subscriptionPlan;
    private TagUserApi tagApi;

    @BeforeSuite(groups = "fast")
    public void setup() throws ServiceException {
        catalogService = new MockCatalogService(new MockCatalog());
        clock = new ClockMock();
    }

    @BeforeMethod(groups = "fast")
    public void setupEveryTime() throws EntitlementUserApiException {
        final List<SubscriptionBundle> bundles = new ArrayList<SubscriptionBundle>();
        final SubscriptionBundle bundle = Mockito.mock(SubscriptionBundle.class);
        Mockito.when(bundle.getId()).thenReturn(bunId);

        //new SubscriptionBundleData( eventId,"TestKey", subId,  clock.getUTCNow().minusDays(4), null);
        bundles.add(bundle);

        effectiveSubscriptionTransitions = new LinkedList<EffectiveSubscriptionEvent>();
        final List<Subscription> subscriptions = new LinkedList<Subscription>();

        subscriptionStartDate = clock.getUTCNow().minusDays(3);
        subscription = new MockSubscription(subId, bunId, subscriptionPlan, subscriptionStartDate, effectiveSubscriptionTransitions);

        subscriptions.add(subscription);

        entitlementApi = Mockito.mock(EntitlementUserApi.class);
        Mockito.when(entitlementApi.getBundlesForAccount(Mockito.<UUID>any())).thenReturn(bundles);
        Mockito.when(entitlementApi.getSubscriptionsForBundle(Mockito.<UUID>any())).thenReturn(subscriptions);
        Mockito.when(entitlementApi.getSubscriptionFromId(Mockito.<UUID>any())).thenReturn(subscription);
        Mockito.when(entitlementApi.getBundleFromId(Mockito.<UUID>any())).thenReturn(bundle);
        Mockito.when(entitlementApi.getBaseSubscription(Mockito.<UUID>any())).thenReturn(subscription);

        tagApi = mock(TagUserApi.class);

        assertTrue(true);
    }

    @Test(groups = "fast")
    public void testBillingEventsEmpty() throws AccountApiException {
        final UUID accountId = UUID.randomUUID();
        final Account account = Mockito.mock(Account.class);
        Mockito.when(account.getId()).thenReturn(accountId);
        Mockito.when(account.getCurrency()).thenReturn(Currency.USD);

        final AccountUserApi accountApi = Mockito.mock(AccountUserApi.class);
        Mockito.when(accountApi.getAccountById(Mockito.<UUID>any())).thenReturn(account);

        final BillCycleDayCalculator bcdCalculator = new BillCycleDayCalculator(catalogService, entitlementApi);
        final CallContextFactory factory = new DefaultCallContextFactory(clock);

        final BillingApi api = new DefaultBillingApi(null, factory, accountApi, bcdCalculator, entitlementApi, blockCalculator, catalogService, tagApi);

        final SortedSet<BillingEvent> events = api.getBillingEventsForAccountAndUpdateAccountBCD(new UUID(0L, 0L));
        Assert.assertEquals(events.size(), 0);
    }

    @Test(groups = "fast")
    public void testBillingEventsNoBillingPeriod() throws CatalogApiException, AccountApiException {
        final DateTime now = clock.getUTCNow();
        final DateTime then = now.minusDays(1);
        final Plan nextPlan = catalogService.getFullCatalog().findPlan("PickupTrialEvergreen10USD", now);
        final PlanPhase nextPhase = nextPlan.getAllPhases()[0]; // The trial has no billing period
        final PriceList nextPriceList = catalogService.getFullCatalog().findPriceList(PriceListSet.DEFAULT_PRICELIST_NAME, now);

        final EffectiveSubscriptionEvent t = new MockEffectiveSubscriptionEvent(
                eventId, subId, bunId, then, now, null, null, null, null, SubscriptionState.ACTIVE,
                nextPlan.getName(), nextPhase.getName(),
                nextPriceList.getName(), 1L, null,
                SubscriptionTransitionType.CREATE, 0, null);

        effectiveSubscriptionTransitions.add(t);

        final AccountUserApi accountApi = Mockito.mock(AccountUserApi.class);
        final Account account = Mockito.mock(Account.class);
        Mockito.when(account.getBillCycleDay()).thenReturn(32);
        Mockito.when(account.getCurrency()).thenReturn(Currency.USD);
        Mockito.when(account.getId()).thenReturn(UUID.randomUUID());
        Mockito.when(account.getTimeZone()).thenReturn(DateTimeZone.UTC);
        Mockito.when(accountApi.getAccountById(Mockito.<UUID>any())).thenReturn(account);

        final BillCycleDayCalculator bcdCalculator = new BillCycleDayCalculator(catalogService, entitlementApi);
        final CallContextFactory factory = new DefaultCallContextFactory(clock);
        final BillingApi api = new DefaultBillingApi(null, factory, accountApi, bcdCalculator, entitlementApi, blockCalculator, catalogService, tagApi);
        final SortedSet<BillingEvent> events = api.getBillingEventsForAccountAndUpdateAccountBCD(new UUID(0L, 0L));

        checkFirstEvent(events, nextPlan, 32, subId, now, nextPhase, SubscriptionTransitionType.CREATE.toString());
    }

    @Test(enabled = false, groups = "fast")
    public void testBillingEventsAnnual() throws CatalogApiException, AccountApiException {
        final DateTime now = clock.getUTCNow();
        final DateTime then = now.minusDays(1);
        final Plan nextPlan = catalogService.getFullCatalog().findPlan("PickupTrialEvergreen10USD", now);
        final PlanPhase nextPhase = nextPlan.getAllPhases()[1];
        final PriceList nextPriceList = catalogService.getFullCatalog().findPriceList(PriceListSet.DEFAULT_PRICELIST_NAME, now);
        final EffectiveSubscriptionEvent t = new MockEffectiveSubscriptionEvent(
                eventId, subId, bunId, then, now, null, null, null, null, SubscriptionState.ACTIVE,
                nextPlan.getName(), nextPhase.getName(),
                nextPriceList.getName(), 1L, null,
                SubscriptionTransitionType.CREATE, 0, null);

        effectiveSubscriptionTransitions.add(t);

        final Account account = Mockito.mock(Account.class);
        Mockito.when(account.getBillCycleDay()).thenReturn(1);
        Mockito.when(account.getTimeZone()).thenReturn(DateTimeZone.UTC);
        Mockito.when(account.getCurrency()).thenReturn(Currency.USD);

        ((MockCatalog) catalogService.getFullCatalog()).setBillingAlignment(BillingAlignment.SUBSCRIPTION);

        final AccountUserApi accountApi = Mockito.mock(AccountUserApi.class);
        Mockito.when(accountApi.getAccountById(Mockito.<UUID>any())).thenReturn(account);

        final BillCycleDayCalculator bcdCalculator = new BillCycleDayCalculator(catalogService, entitlementApi);
        final CallContextFactory factory = new DefaultCallContextFactory(clock);

        final BillingApi api = new DefaultBillingApi(null, factory, accountApi, bcdCalculator, entitlementApi, blockCalculator, catalogService, tagApi);
        final SortedSet<BillingEvent> events = api.getBillingEventsForAccountAndUpdateAccountBCD(new UUID(0L, 0L));

        checkFirstEvent(events, nextPlan, subscription.getStartDate().plusDays(30).getDayOfMonth(), subId, now, nextPhase, SubscriptionTransitionType.CREATE.toString());
    }

    @Test(groups = "fast")
    public void testBillingEventsMonthly() throws CatalogApiException, AccountApiException {
        final DateTime now = clock.getUTCNow();
        final DateTime then = now.minusDays(1);
        final Plan nextPlan = catalogService.getFullCatalog().findPlan("PickupTrialEvergreen10USD", now);
        final PlanPhase nextPhase = nextPlan.getAllPhases()[1];
        final PriceList nextPriceList = catalogService.getFullCatalog().findPriceList(PriceListSet.DEFAULT_PRICELIST_NAME, now);

        final EffectiveSubscriptionEvent t = new MockEffectiveSubscriptionEvent(
                eventId, subId, bunId, then, now, null, null, null, null, SubscriptionState.ACTIVE,
                nextPlan.getName(), nextPhase.getName(),
                nextPriceList.getName(), 1L, null,
                SubscriptionTransitionType.CREATE, 0, null);

        effectiveSubscriptionTransitions.add(t);

        final AccountUserApi accountApi = Mockito.mock(AccountUserApi.class);
        final Account account = Mockito.mock(Account.class);
        Mockito.when(account.getBillCycleDay()).thenReturn(32);
        Mockito.when(account.getCurrency()).thenReturn(Currency.USD);
        Mockito.when(account.getId()).thenReturn(UUID.randomUUID());
        Mockito.when(account.getTimeZone()).thenReturn(DateTimeZone.UTC);
        Mockito.when(accountApi.getAccountById(Mockito.<UUID>any())).thenReturn(account);

        ((MockCatalog) catalogService.getFullCatalog()).setBillingAlignment(BillingAlignment.ACCOUNT);

        final BillCycleDayCalculator bcdCalculator = new BillCycleDayCalculator(catalogService, entitlementApi);
        final CallContextFactory factory = new DefaultCallContextFactory(clock);
        final BillingApi api = new DefaultBillingApi(null, factory, accountApi, bcdCalculator, entitlementApi, blockCalculator, catalogService, tagApi);

        final SortedSet<BillingEvent> events = api.getBillingEventsForAccountAndUpdateAccountBCD(new UUID(0L, 0L));

        checkFirstEvent(events, nextPlan, 32, subId, now, nextPhase, SubscriptionTransitionType.CREATE.toString());
    }

    @Test(enabled = false, groups = "fast")
    public void testBillingEventsAddOn() throws CatalogApiException, AccountApiException {
        final DateTime now = clock.getUTCNow();
        final DateTime then = now.minusDays(1);
        final Plan nextPlan = catalogService.getFullCatalog().findPlan("Horn1USD", now);
        final PlanPhase nextPhase = nextPlan.getAllPhases()[0];
        final PriceList nextPriceList = catalogService.getFullCatalog().findPriceList(PriceListSet.DEFAULT_PRICELIST_NAME, now);

        final EffectiveSubscriptionEvent t = new MockEffectiveSubscriptionEvent(
                eventId, subId, bunId, then, now, null, null, null, null, SubscriptionState.ACTIVE,
                nextPlan.getName(), nextPhase.getName(),
                nextPriceList.getName(), 1L, null,
                SubscriptionTransitionType.CREATE, 0, null);

        effectiveSubscriptionTransitions.add(t);

        final Account account = Mockito.mock(Account.class);
        Mockito.when(account.getBillCycleDay()).thenReturn(1);
        Mockito.when(account.getTimeZone()).thenReturn(DateTimeZone.UTC);
        Mockito.when(account.getCurrency()).thenReturn(Currency.USD);
        Mockito.when(account.getId()).thenReturn(UUID.randomUUID());
        Mockito.when(account.getTimeZone()).thenReturn(DateTimeZone.UTC);

        final AccountUserApi accountApi = Mockito.mock(AccountUserApi.class);
        Mockito.when(accountApi.getAccountById(Mockito.<UUID>any())).thenReturn(account);

        ((MockCatalog) catalogService.getFullCatalog()).setBillingAlignment(BillingAlignment.BUNDLE);

        final BillCycleDayCalculator bcdCalculator = new BillCycleDayCalculator(catalogService, entitlementApi);
        final CallContextFactory factory = new DefaultCallContextFactory(clock);

        final BillingApi api = new DefaultBillingApi(null, factory, accountApi, bcdCalculator, entitlementApi, blockCalculator, catalogService, tagApi);
        subscriptionPlan = catalogService.getFullCatalog().findPlan("PickupTrialEvergreen10USD", now);

        final SortedSet<BillingEvent> events = api.getBillingEventsForAccountAndUpdateAccountBCD(new UUID(0L, 0L));

        checkFirstEvent(events, nextPlan, subscription.getStartDate().plusDays(30).getDayOfMonth(), subId, now, nextPhase, SubscriptionTransitionType.CREATE.toString());
    }

    @Test(groups = "fast")
    public void testBillingEventsWithBlock() throws CatalogApiException, AccountApiException {
        final DateTime now = clock.getUTCNow();
        final DateTime then = now.minusDays(1);
        final Plan nextPlan = catalogService.getFullCatalog().findPlan("PickupTrialEvergreen10USD", now);
        final PlanPhase nextPhase = nextPlan.getAllPhases()[1];
        final PriceList nextPriceList = catalogService.getFullCatalog().findPriceList(PriceListSet.DEFAULT_PRICELIST_NAME, now);

        final EffectiveSubscriptionEvent t = new MockEffectiveSubscriptionEvent(
                eventId, subId, bunId, then, now, null, null, null, null, SubscriptionState.ACTIVE,
                nextPlan.getName(), nextPhase.getName(),
                nextPriceList.getName(), 1L, null,
                SubscriptionTransitionType.CREATE, 0, null);

        effectiveSubscriptionTransitions.add(t);

        final AccountUserApi accountApi = Mockito.mock(AccountUserApi.class);
        final Account account = Mockito.mock(Account.class);
        Mockito.when(account.getBillCycleDay()).thenReturn(32);
        Mockito.when(account.getCurrency()).thenReturn(Currency.USD);
        Mockito.when(account.getTimeZone()).thenReturn(DateTimeZone.UTC);
        Mockito.when(accountApi.getAccountById(Mockito.<UUID>any())).thenReturn(account);
        Mockito.when(account.getId()).thenReturn(UUID.randomUUID());

        ((MockCatalog) catalogService.getFullCatalog()).setBillingAlignment(BillingAlignment.ACCOUNT);

        final SortedSet<BlockingState> blockingStates = new TreeSet<BlockingState>();
        blockingStates.add(new DefaultBlockingState(bunId, DISABLED_BUNDLE, Blockable.Type.SUBSCRIPTION_BUNDLE, "test", true, true, true, now.plusDays(1)));
        blockingStates.add(new DefaultBlockingState(bunId, CLEAR_BUNDLE, Blockable.Type.SUBSCRIPTION_BUNDLE, "test", false, false, false, now.plusDays(2)));

        final BlockingCalculator blockingCal = new BlockingCalculator(new BlockingApi() {
            @Override
            public <T extends Blockable> void setBlockingState(final BlockingState state) {
            }

            @Override
            public BlockingState getBlockingStateFor(final UUID overdueableId) {
                return null;
            }

            @Override
            public BlockingState getBlockingStateFor(final Blockable overdueable) {
                return null;
            }

            @Override
            public SortedSet<BlockingState> getBlockingHistory(final UUID overdueableId) {
                if (overdueableId == bunId) {
                    return blockingStates;
                }
                return new TreeSet<BlockingState>();
            }

            @Override
            public SortedSet<BlockingState> getBlockingHistory(final Blockable overdueable) {
                return new TreeSet<BlockingState>();
            }
        });

        final BillCycleDayCalculator bcdCalculator = new BillCycleDayCalculator(catalogService, entitlementApi);
        final CallContextFactory factory = new DefaultCallContextFactory(clock);
        final BillingApi api = new DefaultBillingApi(null, factory, accountApi, bcdCalculator, entitlementApi, blockingCal, catalogService, tagApi);
        final SortedSet<BillingEvent> events = api.getBillingEventsForAccountAndUpdateAccountBCD(new UUID(0L, 0L));

        Assert.assertEquals(events.size(), 3);
        final Iterator<BillingEvent> it = events.iterator();

        checkEvent(it.next(), nextPlan, 32, subId, now, nextPhase, SubscriptionTransitionType.CREATE.toString(), nextPhase.getFixedPrice(), nextPhase.getRecurringPrice());
        checkEvent(it.next(), nextPlan, 32, subId, now.plusDays(1), nextPhase, SubscriptionTransitionType.CANCEL.toString(), new MockPrice("0"), new MockPrice("0"));
        checkEvent(it.next(), nextPlan, 32, subId, now.plusDays(2), nextPhase, SubscriptionTransitionType.RE_CREATE.toString(), nextPhase.getFixedPrice(), nextPhase.getRecurringPrice());
    }

    @Test(groups = "fast")
    public void testBillingEventsAutoInvoicingOffAccount() throws CatalogApiException, AccountApiException {
        final DateTime now = clock.getUTCNow();
        final DateTime then = now.minusDays(1);
        final Plan nextPlan = catalogService.getFullCatalog().findPlan("PickupTrialEvergreen10USD", now);
        final PlanPhase nextPhase = nextPlan.getAllPhases()[1];
        final PriceList nextPriceList = catalogService.getFullCatalog().findPriceList(PriceListSet.DEFAULT_PRICELIST_NAME, now);

        final EffectiveSubscriptionEvent t = new MockEffectiveSubscriptionEvent(
                eventId, subId, bunId, then, now, null, null, null, null, SubscriptionState.ACTIVE,
                nextPlan.getName(), nextPhase.getName(),
                nextPriceList.getName(), 1L, null,
                SubscriptionTransitionType.CREATE, 0, null);

        effectiveSubscriptionTransitions.add(t);

        final AccountUserApi accountApi = Mockito.mock(AccountUserApi.class);
        final Account account = Mockito.mock(Account.class);
        Mockito.when(account.getBillCycleDay()).thenReturn(32);
        Mockito.when(account.getCurrency()).thenReturn(Currency.USD);
        Mockito.when(account.getId()).thenReturn(UUID.randomUUID());
        Mockito.when(accountApi.getAccountById(Mockito.<UUID>any())).thenReturn(account);

        final Map<String, Tag> tags = new HashMap<String, Tag>();
        final Tag aioTag = mock(Tag.class);
        when(aioTag.getTagDefinitionName()).thenReturn(ControlTagType.AUTO_INVOICING_OFF.name());
        tags.put(ControlTagType.AUTO_INVOICING_OFF.name(), aioTag);
        when(tagApi.getTags(account.getId(), ObjectType.ACCOUNT)).thenReturn(tags);
        assertEquals(tagApi.getTags(account.getId(), ObjectType.ACCOUNT), tags);

        ((MockCatalog) catalogService.getFullCatalog()).setBillingAlignment(BillingAlignment.ACCOUNT);

        final BillCycleDayCalculator bcdCalculator = new BillCycleDayCalculator(catalogService, entitlementApi);
        final CallContextFactory factory = new DefaultCallContextFactory(clock);
        final BillingApi api = new DefaultBillingApi(null, factory, accountApi, bcdCalculator, entitlementApi, blockCalculator, catalogService, tagApi);

        final BillingEventSet events = api.getBillingEventsForAccountAndUpdateAccountBCD(account.getId());

        assertEquals(events.isAccountAutoInvoiceOff(), true);
        assertEquals(events.size(), 0);
    }

    @Test(groups = "fast")
    public void testBillingEventsAutoInvoicingOffBundle() throws CatalogApiException, AccountApiException {
        final DateTime now = clock.getUTCNow();
        final DateTime then = now.minusDays(1);
        final Plan nextPlan = catalogService.getFullCatalog().findPlan("PickupTrialEvergreen10USD", now);
        final PlanPhase nextPhase = nextPlan.getAllPhases()[1];
        final PriceList nextPriceList = catalogService.getFullCatalog().findPriceList(PriceListSet.DEFAULT_PRICELIST_NAME, now);

        final EffectiveSubscriptionEvent t = new MockEffectiveSubscriptionEvent(
                eventId, subId, bunId, then, now, null, null, null, null, SubscriptionState.ACTIVE,
                nextPlan.getName(), nextPhase.getName(),
                nextPriceList.getName(), 1L, null,
                SubscriptionTransitionType.CREATE, 0, null);

        effectiveSubscriptionTransitions.add(t);

        final AccountUserApi accountApi = Mockito.mock(AccountUserApi.class);
        final Account account = Mockito.mock(Account.class);
        Mockito.when(account.getBillCycleDay()).thenReturn(32);
        Mockito.when(account.getCurrency()).thenReturn(Currency.USD);
        Mockito.when(account.getId()).thenReturn(UUID.randomUUID());
        Mockito.when(accountApi.getAccountById(Mockito.<UUID>any())).thenReturn(account);

        final Map<String, Tag> tags = new HashMap<String, Tag>();
        final Tag aioTag = mock(Tag.class);
        when(aioTag.getTagDefinitionName()).thenReturn(ControlTagType.AUTO_INVOICING_OFF.name());
        tags.put(ControlTagType.AUTO_INVOICING_OFF.name(), aioTag);
        when(tagApi.getTags(bunId, ObjectType.BUNDLE)).thenReturn(tags);

        ((MockCatalog) catalogService.getFullCatalog()).setBillingAlignment(BillingAlignment.ACCOUNT);

        final BillCycleDayCalculator bcdCalculator = new BillCycleDayCalculator(catalogService, entitlementApi);
        final CallContextFactory factory = new DefaultCallContextFactory(clock);
        final BillingApi api = new DefaultBillingApi(null, factory, accountApi, bcdCalculator, entitlementApi, blockCalculator, catalogService, tagApi);

        final BillingEventSet events = api.getBillingEventsForAccountAndUpdateAccountBCD(account.getId());

        assertEquals(events.getSubscriptionIdsWithAutoInvoiceOff().size(), 1);
        assertEquals(events.getSubscriptionIdsWithAutoInvoiceOff().get(0), subId);
        assertEquals(events.size(), 0);
    }

    private void checkFirstEvent(final SortedSet<BillingEvent> events, final Plan nextPlan,
                                 final int BCD, final UUID id, final DateTime time, final PlanPhase nextPhase, final String desc) throws CatalogApiException {
        Assert.assertEquals(events.size(), 1);
        checkEvent(events.first(), nextPlan,
                   BCD, id, time, nextPhase, desc, nextPhase.getFixedPrice(), nextPhase.getRecurringPrice());
    }

    private void checkEvent(final BillingEvent event, final Plan nextPlan,
                            final int BCD, final UUID id, final DateTime time, final PlanPhase nextPhase, final String desc, final InternationalPrice fixedPrice, final InternationalPrice recurringPrice) throws CatalogApiException {
        if (fixedPrice != null) {
            Assert.assertEquals(fixedPrice.getPrice(Currency.USD), event.getFixedPrice());
        } else {
            assertNull(event.getFixedPrice());
        }

        if (recurringPrice != null) {
            Assert.assertEquals(recurringPrice.getPrice(Currency.USD), event.getRecurringPrice());
        } else {
            assertNull(event.getRecurringPrice());
        }

        Assert.assertEquals(BCD, event.getBillCycleDay());
        Assert.assertEquals(id, event.getSubscription().getId());
        Assert.assertEquals(time.getDayOfMonth(), event.getEffectiveDate().getDayOfMonth());
        Assert.assertEquals(nextPhase, event.getPlanPhase());
        Assert.assertEquals(nextPlan, event.getPlan());
        Assert.assertEquals(nextPhase.getBillingPeriod(), event.getBillingPeriod());
        Assert.assertEquals(BillingModeType.IN_ADVANCE, event.getBillingMode());
        Assert.assertEquals(desc, event.getTransitionType().toString());
    }
}
