/*
 * 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.entitlement.api.user;

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

import org.apache.commons.lang.NotImplementedException;
import org.joda.time.DateTime;
import org.joda.time.Period;
import org.testng.Assert;
import org.testng.annotations.Test;

import com.google.inject.Guice;
import com.google.inject.Injector;
import com.google.inject.Stage;
import com.ning.billing.catalog.api.BillingPeriod;
import com.ning.billing.catalog.api.CatalogApiException;
import com.ning.billing.catalog.api.Duration;
import com.ning.billing.catalog.api.PhaseType;
import com.ning.billing.catalog.api.Plan;
import com.ning.billing.catalog.api.PlanAlignmentCreate;
import com.ning.billing.catalog.api.PlanPhase;
import com.ning.billing.catalog.api.PlanSpecifier;
import com.ning.billing.catalog.api.PriceListSet;
import com.ning.billing.catalog.api.ProductCategory;
import com.ning.billing.catalog.api.TimeUnit;
import com.ning.billing.entitlement.api.ApiTestListener.NextEvent;
import com.ning.billing.entitlement.api.TestApiBase;
import com.ning.billing.entitlement.api.user.Subscription.SubscriptionState;
import com.ning.billing.entitlement.glue.MockEngineModuleSql;
import com.ning.billing.util.clock.DefaultClock;

public class TestUserApiAddOn extends TestApiBase {

    @Override
    public Injector getInjector() {
        return Guice.createInjector(Stage.DEVELOPMENT, new MockEngineModuleSql());
    }

    @Test(enabled=true, groups={"slow"})
    public void testCreateCancelAddon() {

        try {
            String baseProduct = "Shotgun";
            BillingPeriod baseTerm = BillingPeriod.MONTHLY;
            String basePriceList = PriceListSet.DEFAULT_PRICELIST_NAME;

            createSubscription(baseProduct, baseTerm, basePriceList);

            String aoProduct = "Telescopic-Scope";
            BillingPeriod aoTerm = BillingPeriod.MONTHLY;
            String aoPriceList = PriceListSet.DEFAULT_PRICELIST_NAME;

            SubscriptionData aoSubscription = createSubscription(aoProduct, aoTerm, aoPriceList);
            assertEquals(aoSubscription.getState(), SubscriptionState.ACTIVE);

            DateTime now = clock.getUTCNow();
            aoSubscription.cancel(now, false, context);

            testListener.reset();
            testListener.pushExpectedEvent(NextEvent.CANCEL);
            assertTrue(testListener.isCompleted(5000));

            assertEquals(aoSubscription.getState(), SubscriptionState.CANCELLED);

        } catch (Exception e) {
            Assert.fail(e.getMessage());
        }
    }

    @Test(enabled=true, groups={"slow"})
    public void testCancelBPWthAddon() {
        try {

            String baseProduct = "Shotgun";
            BillingPeriod baseTerm = BillingPeriod.MONTHLY;
            String basePriceList = PriceListSet.DEFAULT_PRICELIST_NAME;

            // CREATE BP
            SubscriptionData baseSubscription = createSubscription(baseProduct, baseTerm, basePriceList);

            String aoProduct = "Telescopic-Scope";
            BillingPeriod aoTerm = BillingPeriod.MONTHLY;
            String aoPriceList = PriceListSet.DEFAULT_PRICELIST_NAME;

            SubscriptionData aoSubscription = createSubscription(aoProduct, aoTerm, aoPriceList);

            testListener.reset();
            testListener.pushExpectedEvent(NextEvent.PHASE);
            testListener.pushExpectedEvent(NextEvent.PHASE);

            // MOVE CLOCK AFTER TRIAL + AO DISCOUNT
            Duration twoMonths = getDurationMonth(2);
            clock.setDeltaFromReality(twoMonths, DAY_IN_MS);
            assertTrue(testListener.isCompleted(5000));

            // SET CTD TO CANCEL IN FUTURE
            DateTime now = clock.getUTCNow();
            Duration ctd = getDurationMonth(1);
            DateTime newChargedThroughDate = DefaultClock.addDuration(now, ctd);
            billingApi.setChargedThroughDate(baseSubscription.getId(), newChargedThroughDate, context);
            baseSubscription = (SubscriptionData) entitlementApi.getSubscriptionFromId(baseSubscription.getId());

            // FUTURE CANCELLATION
            baseSubscription.cancel(now, false, context);

            // REFETCH AO SUBSCRIPTION AND CHECK THIS IS ACTIVE
            aoSubscription = (SubscriptionData) entitlementApi.getSubscriptionFromId(aoSubscription.getId());
            assertEquals(aoSubscription.getState(), SubscriptionState.ACTIVE);
            assertTrue(aoSubscription.isSubscriptionFutureCancelled());


            // MOVE AFTER CANCELLATION
            testListener.reset();
            testListener.pushExpectedEvent(NextEvent.CANCEL);
            testListener.pushExpectedEvent(NextEvent.CANCEL);
            clock.addDeltaFromReality(ctd);
            assertTrue(testListener.isCompleted(5000));

            // REFETCH AO SUBSCRIPTION AND CHECK THIS IS CANCELLED
            aoSubscription = (SubscriptionData) entitlementApi.getSubscriptionFromId(aoSubscription.getId());
            assertEquals(aoSubscription.getState(), SubscriptionState.CANCELLED);

        } catch (Exception e) {
            Assert.fail(e.getMessage());
        }
    }


    @Test(enabled=true, groups={"slow"})
    public void testChangeBPWthAddonNonIncluded() {
        try {

            String baseProduct = "Shotgun";
            BillingPeriod baseTerm = BillingPeriod.MONTHLY;
            String basePriceList = PriceListSet.DEFAULT_PRICELIST_NAME;

            // CREATE BP
            SubscriptionData baseSubscription = createSubscription(baseProduct, baseTerm, basePriceList);

            String aoProduct = "Telescopic-Scope";
            BillingPeriod aoTerm = BillingPeriod.MONTHLY;
            String aoPriceList = PriceListSet.DEFAULT_PRICELIST_NAME;

            SubscriptionData aoSubscription = createSubscription(aoProduct, aoTerm, aoPriceList);

            testListener.reset();
            testListener.pushExpectedEvent(NextEvent.PHASE);
            testListener.pushExpectedEvent(NextEvent.PHASE);

            // MOVE CLOCK AFTER TRIAL + AO DISCOUNT
            Duration twoMonths = getDurationMonth(2);
            clock.setDeltaFromReality(twoMonths, DAY_IN_MS);
            assertTrue(testListener.isCompleted(5000));

            // SET CTD TO CHANGE IN FUTURE
            DateTime now = clock.getUTCNow();
            Duration ctd = getDurationMonth(1);
            DateTime newChargedThroughDate = DefaultClock.addDuration(now, ctd);
            billingApi.setChargedThroughDate(baseSubscription.getId(), newChargedThroughDate, context);
            baseSubscription = (SubscriptionData) entitlementApi.getSubscriptionFromId(baseSubscription.getId());

            // CHANGE IMMEDIATELY WITH TO BP WITH NON INCLUDED ADDON
            String newBaseProduct = "Assault-Rifle";
            BillingPeriod newBaseTerm = BillingPeriod.MONTHLY;
            String newBasePriceList = PriceListSet.DEFAULT_PRICELIST_NAME;

            testListener.reset();
            testListener.pushExpectedEvent(NextEvent.CHANGE);
            testListener.pushExpectedEvent(NextEvent.CANCEL);
            baseSubscription.changePlan(newBaseProduct, newBaseTerm, newBasePriceList, now, context);
            assertTrue(testListener.isCompleted(5000));

            // REFETCH AO SUBSCRIPTION AND CHECK THIS CANCELLED
            aoSubscription = (SubscriptionData) entitlementApi.getSubscriptionFromId(aoSubscription.getId());
            assertEquals(aoSubscription.getState(), SubscriptionState.CANCELLED);

        } catch (Exception e) {
            Assert.fail(e.getMessage());
        }
    }

    @Test(enabled=true, groups={"slow"})
    public void testChangeBPWthAddonNonAvailable() {
        try {

            String baseProduct = "Shotgun";
            BillingPeriod baseTerm = BillingPeriod.MONTHLY;
            String basePriceList = PriceListSet.DEFAULT_PRICELIST_NAME;

            // CREATE BP
            SubscriptionData baseSubscription = createSubscription(baseProduct, baseTerm, basePriceList);

            String aoProduct = "Telescopic-Scope";
            BillingPeriod aoTerm = BillingPeriod.MONTHLY;
            String aoPriceList = PriceListSet.DEFAULT_PRICELIST_NAME;

            SubscriptionData aoSubscription = createSubscription(aoProduct, aoTerm, aoPriceList);

            testListener.reset();
            testListener.pushExpectedEvent(NextEvent.PHASE);
            testListener.pushExpectedEvent(NextEvent.PHASE);

            // MOVE CLOCK AFTER TRIAL + AO DISCOUNT
            Duration twoMonths = getDurationMonth(2);
            clock.setDeltaFromReality(twoMonths, DAY_IN_MS);
            assertTrue(testListener.isCompleted(5000));

            // SET CTD TO CANCEL IN FUTURE
            DateTime now = clock.getUTCNow();
            Duration ctd = getDurationMonth(1);
            DateTime newChargedThroughDate = DefaultClock.addDuration(now, ctd);
            billingApi.setChargedThroughDate(baseSubscription.getId(), newChargedThroughDate, context);
            baseSubscription = (SubscriptionData) entitlementApi.getSubscriptionFromId(baseSubscription.getId());

            // CHANGE IMMEDIATELY WITH TO BP WITH NON AVAILABLE ADDON
            String newBaseProduct = "Pistol";
            BillingPeriod newBaseTerm = BillingPeriod.MONTHLY;
            String newBasePriceList = PriceListSet.DEFAULT_PRICELIST_NAME;

            baseSubscription.changePlan(newBaseProduct, newBaseTerm, newBasePriceList, now, context);


            // REFETCH AO SUBSCRIPTION AND CHECK THIS IS ACTIVE
            aoSubscription = (SubscriptionData) entitlementApi.getSubscriptionFromId(aoSubscription.getId());
            assertEquals(aoSubscription.getState(), SubscriptionState.ACTIVE);
            assertTrue(aoSubscription.isSubscriptionFutureCancelled());

            // MOVE AFTER CHANGE
            testListener.reset();
            testListener.pushExpectedEvent(NextEvent.CHANGE);
            testListener.pushExpectedEvent(NextEvent.CANCEL);
            clock.addDeltaFromReality(ctd);
            assertTrue(testListener.isCompleted(5000));


            // REFETCH AO SUBSCRIPTION AND CHECK THIS CANCELLED
            aoSubscription = (SubscriptionData) entitlementApi.getSubscriptionFromId(aoSubscription.getId());
            assertEquals(aoSubscription.getState(), SubscriptionState.CANCELLED);

        } catch (Exception e) {
            Assert.fail(e.getMessage());
        }
    }


    @Test(enabled=true, groups={"slow"})
    public void testAddonCreateWithBundleAlign() {
        try {
            String aoProduct = "Telescopic-Scope";
            BillingPeriod aoTerm = BillingPeriod.MONTHLY;
            String aoPriceList = PriceListSet.DEFAULT_PRICELIST_NAME;

            // This is just to double check our test catalog gives us what we want before we start the test
            PlanSpecifier planSpecifier = new PlanSpecifier(aoProduct,
                    ProductCategory.ADD_ON,
                    aoTerm,
                    aoPriceList);
            PlanAlignmentCreate alignement = catalog.planCreateAlignment(planSpecifier, clock.getUTCNow());
            assertEquals(alignement, PlanAlignmentCreate.START_OF_BUNDLE);

            testAddonCreateInternal(aoProduct, aoTerm, aoPriceList, alignement);

        } catch (CatalogApiException e) {
            Assert.fail(e.getMessage());
        }
    }

    //TODO MDW - debugging reenable if you find this
    @Test(enabled=true, groups={"slow"})
    public void testAddonCreateWithSubscriptionAlign() {

        try {
            String aoProduct = "Laser-Scope";
            BillingPeriod aoTerm = BillingPeriod.MONTHLY;
            String aoPriceList = PriceListSet.DEFAULT_PRICELIST_NAME;

            // This is just to double check our test catalog gives us what we want before we start the test
            PlanSpecifier planSpecifier = new PlanSpecifier(aoProduct,
                    ProductCategory.ADD_ON,
                    aoTerm,
                    aoPriceList);
            PlanAlignmentCreate alignement = catalog.planCreateAlignment(planSpecifier, clock.getUTCNow());
            assertEquals(alignement, PlanAlignmentCreate.START_OF_SUBSCRIPTION);

            testAddonCreateInternal(aoProduct, aoTerm, aoPriceList, alignement);

            } catch (CatalogApiException e) {
                Assert.fail(e.getMessage());
            }
    }


    private void testAddonCreateInternal(String aoProduct, BillingPeriod aoTerm, String aoPriceList, PlanAlignmentCreate expAlignement) {
        try {

            String baseProduct = "Shotgun";
            BillingPeriod baseTerm = BillingPeriod.MONTHLY;
            String basePriceList = PriceListSet.DEFAULT_PRICELIST_NAME;

            // CREATE BP
            SubscriptionData baseSubscription = createSubscription(baseProduct, baseTerm, basePriceList);

            // MOVE CLOCK 14 DAYS LATER
            Duration someTimeLater = getDurationDay(13);
            clock.setDeltaFromReality(someTimeLater, DAY_IN_MS);

            // CREATE ADDON
            DateTime beforeAOCreation = clock.getUTCNow();
            SubscriptionData aoSubscription = createSubscription(aoProduct, aoTerm, aoPriceList);
            DateTime afterAOCreation = clock.getUTCNow();

            // CHECK EVERYTHING
            Plan aoCurrentPlan = aoSubscription.getCurrentPlan();
            assertNotNull(aoCurrentPlan);
            assertEquals(aoCurrentPlan.getProduct().getName(),aoProduct);
            assertEquals(aoCurrentPlan.getProduct().getCategory(), ProductCategory.ADD_ON);
            assertEquals(aoCurrentPlan.getBillingPeriod(), aoTerm);

            PlanPhase aoCurrentPhase = aoSubscription.getCurrentPhase();
            assertNotNull(aoCurrentPhase);
            assertEquals(aoCurrentPhase.getPhaseType(), PhaseType.DISCOUNT);

           assertDateWithin(aoSubscription.getStartDate(), beforeAOCreation, afterAOCreation);
           assertEquals(aoSubscription.getBundleStartDate(), baseSubscription.getBundleStartDate());

           // CHECK next AO PHASE EVENT IS INDEED A MONTH AFTER BP STARTED => BUNDLE ALIGNMENT
           SubscriptionEventTransition aoPendingTranstion = aoSubscription.getPendingTransition();

           if (expAlignement == PlanAlignmentCreate.START_OF_BUNDLE) {
               assertEquals(aoPendingTranstion.getEffectiveTransitionTime(), baseSubscription.getStartDate().plusMonths(1));
           } else {
               assertEquals(aoPendingTranstion.getEffectiveTransitionTime(), aoSubscription.getStartDate().plusMonths(1));
           }

           // ADD TWO PHASE EVENTS (BP + AO)
           testListener.reset();
           testListener.pushExpectedEvent(NextEvent.PHASE);
           testListener.pushExpectedEvent(NextEvent.PHASE);

           // MOVE THROUGH TIME TO GO INTO EVERGREEN
           
           // Talk with Stephane about this fix. It seemed that the add on phase change was not appearing in the queue
           // hypothesis is that waiting a period that is exactly the duration of the phase might be an instant too short
           // depending how the comparison works
           //someTimeLater = aoCurrentPhase.getDuration();
           someTimeLater = new Duration() {
                @Override
                public TimeUnit getUnit() {
                   return TimeUnit.DAYS;
                }

                @Override
                public int getNumber() {
                   return 32;
                }

                @Override
                public DateTime addToDateTime(DateTime dateTime) {
                   throw new NotImplementedException();
                }
                @Override
                public Period toJodaPeriod() {
                    throw new UnsupportedOperationException();
                }
           };
           
           clock.addDeltaFromReality(someTimeLater);
           assertTrue(testListener.isCompleted(5000));


           // CHECK EVERYTHING AGAIN
           aoSubscription = (SubscriptionData) entitlementApi.getSubscriptionFromId(aoSubscription.getId());

           aoCurrentPlan = aoSubscription.getCurrentPlan();
           assertNotNull(aoCurrentPlan);
           assertEquals(aoCurrentPlan.getProduct().getName(),aoProduct);
           assertEquals(aoCurrentPlan.getProduct().getCategory(), ProductCategory.ADD_ON);
           assertEquals(aoCurrentPlan.getBillingPeriod(), aoTerm);

           aoCurrentPhase = aoSubscription.getCurrentPhase();
           assertNotNull(aoCurrentPhase);
           assertEquals(aoCurrentPhase.getPhaseType(), PhaseType.EVERGREEN);


           aoSubscription = (SubscriptionData) entitlementApi.getSubscriptionFromId(aoSubscription.getId());
           aoPendingTranstion = aoSubscription.getPendingTransition();
           assertNull(aoPendingTranstion);

        } catch (EntitlementUserApiException e) {
            Assert.fail(e.getMessage());
        }
    }
}
