/*
 * Copyright (c) 2015 Cisco Systems, Inc. and others.  All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html
 */
package org.opendaylight.controller.cluster.datastore.utils;

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

import com.google.common.collect.ImmutableList;
import java.util.Collection;
import java.util.Optional;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Executors;
import org.junit.Test;
import org.opendaylight.controller.md.cluster.datastore.model.CarsModel;
import org.opendaylight.controller.md.cluster.datastore.model.SchemaContextHelper;
import org.opendaylight.controller.md.cluster.datastore.model.TestModel;
import org.opendaylight.mdsal.common.api.LogicalDatastoreType;
import org.opendaylight.mdsal.dom.spi.store.DOMStoreReadTransaction;
import org.opendaylight.mdsal.dom.spi.store.DOMStoreThreePhaseCommitCohort;
import org.opendaylight.mdsal.dom.spi.store.DOMStoreWriteTransaction;
import org.opendaylight.mdsal.dom.store.inmemory.InMemoryDOMDataStore;
import org.opendaylight.yangtools.yang.common.QName;
import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
import org.opendaylight.yangtools.yang.data.api.schema.ContainerNode;
import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
import org.opendaylight.yangtools.yang.data.spi.node.ImmutableNodes;
import org.opendaylight.yangtools.yang.data.tree.api.DataValidationFailedException;
import org.opendaylight.yangtools.yang.model.api.EffectiveModelContext;

public class NormalizedNodeAggregatorTest {

    @Test
    public void testAggregate() throws InterruptedException, ExecutionException, DataValidationFailedException {
        EffectiveModelContext schemaContext = SchemaContextHelper.full();
        NormalizedNode expectedNode1 = ImmutableNodes.newContainerBuilder()
            .withNodeIdentifier(new NodeIdentifier(TestModel.TEST_QNAME))
            .build();
        NormalizedNode expectedNode2 = ImmutableNodes.newContainerBuilder()
            .withNodeIdentifier(new NodeIdentifier(CarsModel.CARS_QNAME))
            .build();

        Optional<NormalizedNode> optional = NormalizedNodeAggregator.aggregate(YangInstanceIdentifier.of(),
                ImmutableList.of(
                        Optional.<NormalizedNode>of(getRootNode(expectedNode1, schemaContext)),
                        Optional.<NormalizedNode>of(getRootNode(expectedNode2, schemaContext))),
                schemaContext, LogicalDatastoreType.CONFIGURATION);


        NormalizedNode normalizedNode = optional.orElseThrow();

        assertTrue("Expect value to be a Collection", normalizedNode.body() instanceof Collection);

        @SuppressWarnings("unchecked")
        Collection<NormalizedNode> collection = (Collection<NormalizedNode>) normalizedNode.body();

        for (NormalizedNode node : collection) {
            assertTrue("Expected " + node + " to be a ContainerNode", node instanceof ContainerNode);
        }

        assertTrue("Child with QName = " + TestModel.TEST_QNAME + " not found",
                findChildWithQName(collection, TestModel.TEST_QNAME) != null);

        assertEquals(expectedNode1, findChildWithQName(collection, TestModel.TEST_QNAME));

        assertTrue("Child with QName = " + CarsModel.BASE_QNAME + " not found",
                findChildWithQName(collection, CarsModel.BASE_QNAME) != null);

        assertEquals(expectedNode2, findChildWithQName(collection, CarsModel.BASE_QNAME));

    }

    public static NormalizedNode getRootNode(final NormalizedNode moduleNode,
            final EffectiveModelContext schemaContext) throws ExecutionException, InterruptedException {
        try (InMemoryDOMDataStore store = new InMemoryDOMDataStore("test", Executors.newSingleThreadExecutor())) {
            store.onModelContextUpdated(schemaContext);

            DOMStoreWriteTransaction writeTransaction = store.newWriteOnlyTransaction();

            writeTransaction.merge(YangInstanceIdentifier.of(moduleNode.name().getNodeType()), moduleNode);

            DOMStoreThreePhaseCommitCohort ready = writeTransaction.ready();

            ready.canCommit().get();
            ready.preCommit().get();
            ready.commit().get();

            DOMStoreReadTransaction readTransaction = store.newReadOnlyTransaction();

            return readTransaction.read(YangInstanceIdentifier.of()).get().orElseThrow();
        }
    }

    public static NormalizedNode findChildWithQName(final Collection<NormalizedNode> collection,
            final QName qname) {
        for (NormalizedNode node : collection) {
            if (node.name().getNodeType().equals(qname)) {
                return node;
            }
        }

        return null;
    }
}