/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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.apache.usergrid.corepersistence.rx;


import java.util.HashSet;
import java.util.Set;
import java.util.concurrent.atomic.AtomicLong;

import org.junit.Test;

import org.apache.usergrid.AbstractCoreIT;
import org.apache.usergrid.cassandra.SpringResource;
import org.apache.usergrid.corepersistence.EntityWriteHelper;
import org.apache.usergrid.corepersistence.ManagerCache;
import org.apache.usergrid.corepersistence.rx.impl.AllEntitiesInSystemImpl;
import org.apache.usergrid.corepersistence.util.CpNamingUtils;
import org.apache.usergrid.persistence.EntityManager;
import org.apache.usergrid.persistence.SimpleEntityRef;
import org.apache.usergrid.persistence.collection.serialization.impl.migration.EntityIdScope;
import org.apache.usergrid.persistence.core.scope.ApplicationScope;
import org.apache.usergrid.persistence.graph.GraphManager;
import org.apache.usergrid.persistence.graph.serialization.TargetIdObservable;
import org.apache.usergrid.persistence.model.entity.Id;

import com.google.inject.Injector;

import rx.functions.Action1;

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


/**
 * Tests that when we create a few entities, we get their data.
 */
public class AllEntitiesInSystemObservableIT extends AbstractCoreIT {

    @Test
    public void testEntities() throws Exception {

        Injector injector =  SpringResource.getInstance().getBean(Injector.class);
        AllEntitiesInSystemImpl allEntitiesInSystemObservableImpl =
            injector.getInstance(AllEntitiesInSystemImpl.class);
        TargetIdObservable targetIdObservable = injector.getInstance(TargetIdObservable.class);

        final EntityManager em = app.getEntityManager();

        // create two types of entities

        final String type1 = "type1thing";
        final String type2 = "type2thing";
        final int size = 10;

        final Set<Id> type1Identities = EntityWriteHelper.createTypes( em, type1, size );
        final Set<Id> type2Identities = EntityWriteHelper.createTypes( em, type2, size );

        // connect the first type1 entity to all type2 entities

        final Id source = type1Identities.iterator().next();

        final Set<Id> allEntities = new HashSet<>();
        allEntities.addAll( type1Identities );
        allEntities.addAll( type2Identities );

        final Set<Id> connections = new HashSet<>();

        for ( Id target : type2Identities ) {
            em.createConnection( SimpleEntityRef.fromId( source ),
                "likes", SimpleEntityRef.fromId( target ) );
            connections.add( target );
        }

        // use the all-entities-in-system observable to delete all type1 and type2 entities

        // TODO: clean this up when we clean up our Guice and Spring wiring
        ManagerCache managerCache =  SpringResource.getInstance()
            .getBean( Injector.class ).getInstance( ManagerCache.class );
        final ApplicationScope scope = CpNamingUtils.getApplicationScope( app.getId() );
        final GraphManager gm = managerCache.getGraphManager( scope );

        final AtomicLong counter = new AtomicLong();
        allEntitiesInSystemObservableImpl.getData().doOnNext( new Action1<EntityIdScope>() {
            @Override
            public void call( final EntityIdScope entityIdScope ) {
                assertNotNull(entityIdScope);
                assertNotNull(entityIdScope.getApplicationScope());
                assertNotNull(entityIdScope.getId());

                // we should only emit each node once
                final Id id = entityIdScope.getId();
                if ( id.getType().equals( type1 ) ) {
                    boolean removed =  type1Identities.remove(id);
                    assertTrue( "Element(a:"+counter.incrementAndGet()+") should be present on removal",type1Identities.size() ==0 || removed);
                } else if ( id.getType().equals( type2 ) ) {
                    boolean removed = type2Identities.remove(id );
                    assertTrue( "Element(b:"+counter.incrementAndGet()+") should be present on removal",type2Identities.size() ==0 || removed );
                }
            }
        } ).toBlocking().lastOrDefault( null );

        // there should now be no type1 or type2 entities

        assertEquals( "Every element should have been encountered", 0, type1Identities.size() );
        assertEquals( "Every element should have been encountered", 0, type2Identities.size() );

        //test connections

        targetIdObservable.getTargetNodes( gm, source ).doOnNext( new Action1<Id>() {
            @Override
            public void call( final Id target ) {

                assertTrue( "Element should be present on removal", connections.remove( target ) );
            }
        } ).toBlocking().lastOrDefault( null );

        assertEquals( "Every connection should have been encountered", 0, connections.size() );
    }

}