/*
 * Copyright 2010-2013 Ning, Inc.
 * Copyright 2014 Groupon, 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 org.killbill.billing.beatrix.integration;

import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.List;

import org.joda.time.DateTime;
import org.joda.time.DateTimeZone;
import org.joda.time.LocalDate;
import org.killbill.billing.ErrorCode;
import org.killbill.billing.account.api.Account;
import org.killbill.billing.account.api.AccountApiException;
import org.killbill.billing.api.TestApiListener.NextEvent;
import org.killbill.billing.beatrix.util.InvoiceChecker.ExpectedInvoiceItemCheck;
import org.killbill.billing.catalog.api.BillingActionPolicy;
import org.killbill.billing.catalog.api.BillingPeriod;
import org.killbill.billing.catalog.api.PlanPhaseSpecifier;
import org.killbill.billing.catalog.api.PriceListSet;
import org.killbill.billing.catalog.api.ProductCategory;
import org.killbill.billing.entitlement.api.DefaultEntitlement;
import org.killbill.billing.entitlement.api.DefaultEntitlementSpecifier;
import org.killbill.billing.entitlement.api.Entitlement;
import org.killbill.billing.entitlement.api.Entitlement.EntitlementActionPolicy;
import org.killbill.billing.entitlement.api.EntitlementApiException;
import org.killbill.billing.entitlement.api.EntitlementSpecifier;
import org.killbill.billing.entitlement.api.Subscription;
import org.killbill.billing.entitlement.api.SubscriptionApiException;
import org.killbill.billing.entitlement.api.SubscriptionEventType;
import org.killbill.billing.invoice.api.DryRunType;
import org.killbill.billing.invoice.api.Invoice;
import org.killbill.billing.invoice.api.InvoiceItemType;
import org.killbill.billing.payment.api.PluginProperty;
import org.testng.Assert;
import org.testng.annotations.Test;

import com.google.common.collect.ImmutableList;

import static org.testng.Assert.assertEquals;
import static org.testng.Assert.assertNotNull;
import static org.testng.Assert.assertTrue;

public class TestSubscription extends TestIntegrationBase {

    @Test(groups = "slow")
    public void testForcePolicy() throws Exception {
        // We take april as it has 30 days (easier to play with BCD)
        final LocalDate today = new LocalDate(2012, 4, 1);
        final Account account = createAccountWithNonOsgiPaymentMethod(getAccountData(1));

        // Set clock to the initial start date - we implicitly assume here that the account timezone is UTC
        clock.setDeltaFromReality(today.toDateTimeAtCurrentTime(DateTimeZone.UTC).getMillis() - clock.getUTCNow().getMillis());

        final String productName = "Shotgun";
        final BillingPeriod term = BillingPeriod.ANNUAL;
        final String planSetName = PriceListSet.DEFAULT_PRICELIST_NAME;

        //
        // CREATE SUBSCRIPTION AND EXPECT BOTH EVENTS: NextEvent.CREATE NextEvent.INVOICE
        //

        final DefaultEntitlement bpEntitlement = createBaseEntitlementAndCheckForCompletion(account.getId(), "externalKey", productName, ProductCategory.BASE, BillingPeriod.ANNUAL, NextEvent.CREATE, NextEvent.INVOICE);
        assertNotNull(bpEntitlement);
        assertEquals(invoiceUserApi.getInvoicesByAccount(account.getId(), callContext).size(), 1);

        assertEquals(bpEntitlement.getSubscriptionBase().getCurrentPlan().getRecurringBillingPeriod(), BillingPeriod.ANNUAL);

        // Move out of trials for interesting invoices adjustments
        busHandler.pushExpectedEvents(NextEvent.PHASE, NextEvent.INVOICE, NextEvent.PAYMENT);
        clock.addDays(40);
        assertListenerStatus();

        List<Invoice> invoices = invoiceUserApi.getInvoicesByAccount(account.getId(), callContext);
        assertEquals(invoices.size(), 2);
        ImmutableList<ExpectedInvoiceItemCheck> toBeChecked = ImmutableList.<ExpectedInvoiceItemCheck>of(
                new ExpectedInvoiceItemCheck(new LocalDate(2012, 5, 1), new LocalDate(2013, 5, 1), InvoiceItemType.RECURRING, new BigDecimal("2399.95")));
        invoiceChecker.checkInvoice(invoices.get(1).getId(), callContext, toBeChecked);


        //
        // FORCE AN IMMEDIATE CHANGE OF THE BILLING PERIOD
        //
        toBeChecked = ImmutableList.<ExpectedInvoiceItemCheck>of(
                new ExpectedInvoiceItemCheck(new LocalDate(2012, 5, 11), new LocalDate(2012, 6, 1), InvoiceItemType.RECURRING, new BigDecimal("169.32")),
                new ExpectedInvoiceItemCheck(new LocalDate(2012, 5, 11), new LocalDate(2013, 5, 1), InvoiceItemType.REPAIR_ADJ, new BigDecimal("-2334.20")),
                new ExpectedInvoiceItemCheck(new LocalDate(2012, 5, 11), new LocalDate(2012, 5, 11), InvoiceItemType.CBA_ADJ, new BigDecimal("2164.88"), false /* Issue with test where created date for context is wrong*/));

        TestDryRunArguments dryRun = new TestDryRunArguments(DryRunType.SUBSCRIPTION_ACTION, productName, ProductCategory.BASE, BillingPeriod.MONTHLY, null, null,
                                                             SubscriptionEventType.CHANGE, bpEntitlement.getId(), bpEntitlement.getBundleId(), null, BillingActionPolicy.IMMEDIATE);
        Invoice dryRunInvoice = invoiceUserApi.triggerInvoiceGeneration(account.getId(), clock.getUTCToday(), dryRun, callContext);
        invoiceChecker.checkInvoiceNoAudits(dryRunInvoice, callContext, toBeChecked);

        changeEntitlementAndCheckForCompletion(bpEntitlement, productName, BillingPeriod.MONTHLY, BillingActionPolicy.IMMEDIATE, NextEvent.CHANGE, NextEvent.INVOICE);

        invoices = invoiceUserApi.getInvoicesByAccount(account.getId(), callContext);
        assertEquals(invoices.size(), 3);
        invoiceChecker.checkInvoice(invoices.get(2).getId(), callContext, toBeChecked);

        //
        // FORCE ANOTHER CHANGE
        //
        changeEntitlementAndCheckForCompletion(bpEntitlement, productName, BillingPeriod.ANNUAL, BillingActionPolicy.IMMEDIATE, NextEvent.CHANGE, NextEvent.INVOICE);

        invoices = invoiceUserApi.getInvoicesByAccount(account.getId(), callContext);
        assertEquals(invoices.size(), 4);

        toBeChecked = ImmutableList.<ExpectedInvoiceItemCheck>of(
                new ExpectedInvoiceItemCheck(new LocalDate(2012, 5, 11), new LocalDate(2012, 6, 1), InvoiceItemType.RECURRING, new BigDecimal("169.32")),
                new ExpectedInvoiceItemCheck(new LocalDate(2012, 5, 11), new LocalDate(2013, 5, 1), InvoiceItemType.REPAIR_ADJ, new BigDecimal("-2334.20")),
                new ExpectedInvoiceItemCheck(new LocalDate(2012, 5, 11), new LocalDate(2012, 5, 11), InvoiceItemType.CBA_ADJ, new BigDecimal("2164.88")));
        invoiceChecker.checkInvoice(invoices.get(2).getId(), callContext, toBeChecked);

        toBeChecked = ImmutableList.<ExpectedInvoiceItemCheck>of(
                new ExpectedInvoiceItemCheck(new LocalDate(2012, 5, 11), new LocalDate(2013, 5, 1), InvoiceItemType.RECURRING, new BigDecimal("2334.20")),
                new ExpectedInvoiceItemCheck(new LocalDate(2012, 5, 11), new LocalDate(2012, 6, 1), InvoiceItemType.REPAIR_ADJ, new BigDecimal("-169.32")),
                new ExpectedInvoiceItemCheck(new LocalDate(2012, 5, 11), new LocalDate(2012, 5, 11), InvoiceItemType.CBA_ADJ, new BigDecimal("-2164.88")));
        invoiceChecker.checkInvoice(invoices.get(3).getId(), callContext, toBeChecked);

        checkNoMoreInvoiceToGenerate(account);

    }

    @Test(groups = "slow")
    public void testChangeOfPlan() throws Exception {
        // We take april as it has 30 days (easier to play with BCD)
        final LocalDate today = new LocalDate(2012, 4, 1);
        final Account account = createAccountWithNonOsgiPaymentMethod(getAccountData(1));

        // Set clock to the initial start date - we implicitly assume here that the account timezone is UTC
        clock.setDeltaFromReality(today.toDateTimeAtCurrentTime(DateTimeZone.UTC).getMillis() - clock.getUTCNow().getMillis());

        final String productName = "Shotgun";
        final BillingPeriod term = BillingPeriod.ANNUAL;
        final String planSetName = PriceListSet.DEFAULT_PRICELIST_NAME;

        //
        // CREATE SUBSCRIPTION AND EXPECT BOTH EVENTS: NextEvent.CREATE NextEvent.INVOICE
        //

        final DefaultEntitlement bpEntitlement = createBaseEntitlementAndCheckForCompletion(account.getId(), "externalKey", productName, ProductCategory.BASE, BillingPeriod.ANNUAL, NextEvent.CREATE, NextEvent.INVOICE);
        assertNotNull(bpEntitlement);
        assertEquals(invoiceUserApi.getInvoicesByAccount(account.getId(), callContext).size(), 1);

        assertEquals(bpEntitlement.getSubscriptionBase().getCurrentPlan().getRecurringBillingPeriod(), BillingPeriod.ANNUAL);

        // Move out of trials for interesting invoices adjustments
        busHandler.pushExpectedEvents(NextEvent.PHASE, NextEvent.INVOICE, NextEvent.PAYMENT);
        clock.addDays(40);
        assertListenerStatus();

        List<Invoice> invoices = invoiceUserApi.getInvoicesByAccount(account.getId(), callContext);
        assertEquals(invoices.size(), 2);
        ImmutableList<ExpectedInvoiceItemCheck> toBeChecked = ImmutableList.<ExpectedInvoiceItemCheck>of(
                new ExpectedInvoiceItemCheck(new LocalDate(2012, 5, 1), new LocalDate(2013, 5, 1), InvoiceItemType.RECURRING, new BigDecimal("2399.95")));
        invoiceChecker.checkInvoice(invoices.get(1).getId(), callContext, toBeChecked);

        //
        // FORCE AN IMMEDIATE CHANGE TO TEST THE CHANGE_OF_PLAN ALIGNMENT
        // (Note that, the catalog is configured to use  CHANGE_OF_PLAN when moving to that plan and Not CHANGE_OF_PRICELIST which has not been implement;
        // this is a bit misleading since we are changing pricelist, but in that case pricelist change has no effect)
        changeEntitlementAndCheckForCompletion(bpEntitlement, "Assault-Rifle", BillingPeriod.ANNUAL, "rescue", BillingActionPolicy.IMMEDIATE, NextEvent.CHANGE, NextEvent.INVOICE, NextEvent.PAYMENT);
        invoices = invoiceUserApi.getInvoicesByAccount(account.getId(), callContext);
        assertEquals(invoices.size(), 3);
        toBeChecked = ImmutableList.<ExpectedInvoiceItemCheck>of(
                new ExpectedInvoiceItemCheck(new LocalDate(2012, 5, 1), new LocalDate(2013, 5, 1), InvoiceItemType.RECURRING, new BigDecimal("2399.95")));
        invoiceChecker.checkInvoice(invoices.get(1).getId(), callContext, toBeChecked);

        toBeChecked = ImmutableList.<ExpectedInvoiceItemCheck>of(
                new ExpectedInvoiceItemCheck(new LocalDate(2012, 5, 11), new LocalDate(2013, 5, 1), InvoiceItemType.RECURRING, new BigDecimal("5835.57")),
                new ExpectedInvoiceItemCheck(new LocalDate(2012, 5, 11), new LocalDate(2013, 5, 1), InvoiceItemType.REPAIR_ADJ, new BigDecimal("-2334.20")));
        invoiceChecker.checkInvoice(invoices.get(2).getId(), callContext, toBeChecked);

        checkNoMoreInvoiceToGenerate(account);
    }

    @Test(groups = "slow")
    public void testCreateSubscriptionWithAddOns() throws Exception {
        final LocalDate initialDate = new LocalDate(2015, 10, 1);
        clock.setDay(initialDate);

        final Account account = createAccountWithNonOsgiPaymentMethod(getAccountData(1));

        final PlanPhaseSpecifier baseSpec = new PlanPhaseSpecifier("Shotgun", ProductCategory.BASE, BillingPeriod.MONTHLY, PriceListSet.DEFAULT_PRICELIST_NAME, null);
        final PlanPhaseSpecifier addOnSpec1 = new PlanPhaseSpecifier("Telescopic-Scope", ProductCategory.ADD_ON, BillingPeriod.MONTHLY, PriceListSet.DEFAULT_PRICELIST_NAME, null);
        final PlanPhaseSpecifier addOnSpec2 = new PlanPhaseSpecifier("Laser-Scope", ProductCategory.ADD_ON, BillingPeriod.MONTHLY, PriceListSet.DEFAULT_PRICELIST_NAME, null);

        final String externalKey = "baseExternalKey";
        EntitlementSpecifier baseEntitlementSpecifier = new DefaultEntitlementSpecifier(baseSpec, null);
        EntitlementSpecifier addOnEntitlementSpecifier1 = new DefaultEntitlementSpecifier(addOnSpec1, null);
        EntitlementSpecifier addOnEntitlementSpecifier2 = new DefaultEntitlementSpecifier(addOnSpec2, null);

        final List<EntitlementSpecifier> specifierList = new ArrayList<EntitlementSpecifier>();
        specifierList.add(baseEntitlementSpecifier);
        specifierList.add(addOnEntitlementSpecifier1);
        specifierList.add(addOnEntitlementSpecifier2);

        busHandler.pushExpectedEvents(NextEvent.CREATE, NextEvent.CREATE, NextEvent.CREATE, NextEvent.INVOICE, NextEvent.PAYMENT);
        final Entitlement entitlement = entitlementApi.createBaseEntitlementWithAddOns(account.getId(), externalKey, specifierList, initialDate, ImmutableList.<PluginProperty>of(), callContext);
        assertListenerStatus();
        checkNoMoreInvoiceToGenerate(account);

        assertNotNull(entitlement);

        final List<Entitlement> allEntitlementsForBundle = entitlementApi.getAllEntitlementsForBundle(entitlement.getBundleId(), callContext);
        assertTrue(allEntitlementsForBundle.size() == 3);

        final Entitlement baseEntitlement = allEntitlementsForBundle.get(0);
        final Entitlement addOnEntitlement1 = allEntitlementsForBundle.get(1);
        final Entitlement addOnEntitlement2 = allEntitlementsForBundle.get(2);

        assertEquals(baseEntitlement.getLastActiveProduct().getName(), "Shotgun");
        assertEquals(baseEntitlement.getLastActiveProductCategory(), ProductCategory.BASE);

        assertEquals(addOnEntitlement1.getLastActiveProduct().getName(), "Telescopic-Scope");
        assertEquals(addOnEntitlement1.getLastActiveProductCategory(), ProductCategory.ADD_ON);

        assertEquals(addOnEntitlement2.getLastActiveProduct().getName(), "Laser-Scope");
        assertEquals(addOnEntitlement2.getLastActiveProductCategory(), ProductCategory.ADD_ON);

        final List<Invoice> invoices = invoiceUserApi.getInvoicesByAccount(account.getId(), callContext);
        assertTrue(invoices.size() == 1); // ONLY ONE INVOICE
        assertTrue(invoices.get(0).getInvoiceItems().size() == 3);

        final ImmutableList<ExpectedInvoiceItemCheck> toBeChecked = ImmutableList.<ExpectedInvoiceItemCheck>of(
                new ExpectedInvoiceItemCheck(initialDate, new LocalDate(2015, 10, 31), InvoiceItemType.RECURRING, new BigDecimal("387.05")), // amount=387.05, rate=399.95 -> Telescopic-Scope
                new ExpectedInvoiceItemCheck(initialDate, new LocalDate(2015, 10, 31), InvoiceItemType.RECURRING, new BigDecimal("967.69")), // amount=967.69, rate=999.95 -> Laser-Scope
                new ExpectedInvoiceItemCheck(initialDate, null, InvoiceItemType.FIXED, new BigDecimal("0"))); // Shotgun

        invoiceChecker.checkInvoice(invoices.get(0).getId(), callContext, toBeChecked);

    }



    @Test(groups = "slow")
    public void testCancelFutureSubscriptionWithPolicy() throws Exception {

        final LocalDate initialDate = new LocalDate(2015, 9, 1);
        clock.setDay(initialDate);

        final Account account = createAccountWithNonOsgiPaymentMethod(getAccountData(1));

        final PlanPhaseSpecifier spec = new PlanPhaseSpecifier("Shotgun", ProductCategory.BASE, BillingPeriod.ANNUAL, PriceListSet.DEFAULT_PRICELIST_NAME, null);

        final LocalDate futureDate = new LocalDate(2015, 10, 1);

        // No CREATE event as this is set in the future
        final Entitlement createdEntitlement = entitlementApi.createBaseEntitlement(account.getId(), spec, account.getExternalKey(), null, futureDate, ImmutableList.<PluginProperty>of(), callContext);
        assertEquals(createdEntitlement.getEffectiveStartDate().compareTo(futureDate), 0);
        assertEquals(createdEntitlement.getEffectiveEndDate(), null);
        assertListenerStatus();


        final Entitlement cancelledEntitlement = createdEntitlement.cancelEntitlementWithPolicyOverrideBillingPolicy(EntitlementActionPolicy.IMMEDIATE, BillingActionPolicy.IMMEDIATE, null, callContext);
        assertEquals(cancelledEntitlement.getEffectiveEndDate().compareTo(futureDate), 0);
        assertListenerStatus();

        // Move off trial and reach start/cancellation date
        // NextEvent.INVOICE is required because of #467
        busHandler.pushExpectedEvents(NextEvent.CREATE, NextEvent.BLOCK, NextEvent.CANCEL);
        clock.addDays(30);
        assertListenerStatus();

        // Just to make sure we really don't invoice for anything move to next month
        clock.addMonths(1);
        assertListenerStatus();
    }

    @Test(groups = "slow")
    public void testCancelFutureSubscriptionWithRequestedDate() throws Exception {

        final LocalDate initialDate = new LocalDate(2015, 9, 1);
        clock.setDay(initialDate);

        final Account account = createAccountWithNonOsgiPaymentMethod(getAccountData(1));

        final PlanPhaseSpecifier spec = new PlanPhaseSpecifier("Shotgun", ProductCategory.BASE, BillingPeriod.ANNUAL, PriceListSet.DEFAULT_PRICELIST_NAME, null);

        final LocalDate futureDate = new LocalDate(2015, 10, 1);

        // No CREATE event as this is set in the future
        final Entitlement createdEntitlement = entitlementApi.createBaseEntitlement(account.getId(), spec, account.getExternalKey(), null, futureDate, ImmutableList.<PluginProperty>of(), callContext);
        assertEquals(createdEntitlement.getEffectiveStartDate().compareTo(futureDate), 0);
        assertEquals(createdEntitlement.getEffectiveEndDate(), null);
        assertListenerStatus();


        final LocalDate invalidCancelDate = initialDate.plusDays(1);
        try {
            createdEntitlement.cancelEntitlementWithDate(invalidCancelDate, true, null, callContext);
            Assert.fail("Should not succeed to cancel subscription prior startDate");
        } catch (final EntitlementApiException e) {
            assertEquals(e.getCode(), ErrorCode.SUB_INVALID_REQUESTED_DATE.getCode());
        }

        final Entitlement cancelledEntitlement = createdEntitlement.cancelEntitlementWithDate(futureDate, true, null, callContext);
        assertEquals(cancelledEntitlement.getEffectiveEndDate().compareTo(futureDate), 0);
        assertListenerStatus();

        // Move off trial and reach start/cancellation date
        busHandler.pushExpectedEvents(NextEvent.CREATE, NextEvent.BLOCK, NextEvent.CANCEL);
        clock.addDays(30);
        assertListenerStatus();

        // Just to make sure we really don't invoice for anything move to next month
        clock.addMonths(1);
        assertListenerStatus();

    }
}
