/*
 * Copyright 2014 Open Networking Laboratory
 *
 * Licensed 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.onlab.onos.net.intent;

import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;

import org.junit.Test;
import org.onlab.onos.net.ConnectPoint;
import org.onlab.onos.net.Link;
import org.onlab.onos.net.NetTestTools;
import org.onlab.onos.net.flow.TrafficSelector;
import org.onlab.onos.net.intent.constraint.LambdaConstraint;
import org.onlab.onos.net.resource.Lambda;

import com.google.common.collect.ImmutableSet;
import com.google.common.testing.EqualsTester;

import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.hasSize;
import static org.hamcrest.Matchers.is;
import static org.hamcrest.Matchers.nullValue;
import static org.hamcrest.Matchers.startsWith;
import static org.onlab.junit.ImmutableClassChecker.assertThatClassIsImmutable;
import static org.onlab.onos.net.NetTestTools.APP_ID;
import static org.onlab.onos.net.NetTestTools.link;

/**
 * Unit tests for the LinkCollectionIntent class.
 */
public class LinkCollectionIntentTest extends IntentTest {

    final ConnectPoint egress = NetTestTools.connectPoint("egress", 3);
    final TrafficSelector selector = new IntentTestsMocks.MockSelector();
    final IntentTestsMocks.MockTreatment treatment = new IntentTestsMocks.MockTreatment();

    /**
     * Checks that the LinkCollectionIntent class is immutable.
     */
    @Test
    public void testImmutability() {
        assertThatClassIsImmutable(LinkCollectionIntent.class);
    }

    /**
     * Tests equals(), hashCode() and toString() methods.
     */
    @Test
    public void testEquals() {

        final HashSet<Link> links1 = new HashSet<>();
        links1.add(link("src", 1, "dst", 2));
        final LinkCollectionIntent collectionIntent1 =
                new LinkCollectionIntent(APP_ID,
                        selector,
                        treatment,
                        links1,
                        egress);

        final HashSet<Link> links2 = new HashSet<>();
        links2.add(link("src", 1, "dst", 3));
        final LinkCollectionIntent collectionIntent2 =
                new LinkCollectionIntent(APP_ID,
                        selector,
                        treatment,
                        links2,
                        egress);

        new EqualsTester()
                .addEqualityGroup(collectionIntent1)
                .addEqualityGroup(collectionIntent2)
                .testEquals();
    }

    /**
     * Tests constructor without constraints.
     */
    @Test
    public void testConstructor() {
        final HashSet<Link> links1 = new HashSet<>();
        links1.add(link("src", 1, "dst", 2));
        final LinkCollectionIntent collectionIntent =
                new LinkCollectionIntent(APP_ID,
                        selector,
                        treatment,
                        links1,
                        egress);

        final Set<Link> createdLinks = collectionIntent.links();
        assertThat(createdLinks, hasSize(1));
        assertThat(collectionIntent.isInstallable(), is(true));
        assertThat(collectionIntent.treatment(), is(treatment));
        assertThat(collectionIntent.selector(), is(selector));
        assertThat(collectionIntent.egressPoints(), is(ImmutableSet.of(egress)));
        assertThat(collectionIntent.resources(), hasSize(1));
        final List<Constraint> createdConstraints = collectionIntent.constraints();
        assertThat(createdConstraints, hasSize(0));
    }

    /**
     * Tests constructor with constraints.
     */
    @Test
    public void testConstructorWithConstraints() {
        final HashSet<Link> links1 = new HashSet<>();
        final LinkedList<Constraint> constraints = new LinkedList<>();

        links1.add(link("src", 1, "dst", 2));
        constraints.add(new LambdaConstraint(Lambda.valueOf(23)));
        final LinkCollectionIntent collectionIntent =
                new LinkCollectionIntent(APP_ID,
                        selector,
                        treatment,
                        links1,
                        egress,
                        constraints);

        final Set<Link> createdLinks = collectionIntent.links();
        assertThat(createdLinks, hasSize(1));
        assertThat(collectionIntent.isInstallable(), is(true));
        assertThat(collectionIntent.treatment(), is(treatment));
        assertThat(collectionIntent.selector(), is(selector));
        assertThat(collectionIntent.egressPoints(), is(ImmutableSet.of(egress)));

        final List<Constraint> createdConstraints = collectionIntent.constraints();
        assertThat(createdConstraints, hasSize(1));
        assertThat(createdConstraints.get(0).toString(), startsWith("LambdaConstraint"));
    }

    /**
     * Tests constructor with constraints.
     */
    @Test
    public void testSerializerConstructor() {

        final LinkCollectionIntent collectionIntent =
                new LinkCollectionIntent();

        final Set<Link> createdLinks = collectionIntent.links();
        assertThat(createdLinks, nullValue());
        assertThat(collectionIntent.isInstallable(), is(true));
        assertThat(collectionIntent.treatment(), nullValue());
        assertThat(collectionIntent.selector(), nullValue());
        assertThat(collectionIntent.egressPoints(), nullValue());

        final List<Constraint> createdConstraints = collectionIntent.constraints();
        assertThat(createdConstraints, hasSize(0));
    }

    @Override
    protected Intent createOne() {
        HashSet<Link> links1 = new HashSet<>();
        links1.add(link("src", 1, "dst", 2));
        return new LinkCollectionIntent(APP_ID,
                                        selector,
                                        treatment,
                                        links1,
                                        egress);
    }

    @Override
    protected Intent createAnother() {
        HashSet<Link> links2 = new HashSet<>();
        links2.add(link("src", 1, "dst", 3));
        return new LinkCollectionIntent(APP_ID,
                                        selector,
                                        treatment,
                                        links2,
                                        egress);
    }
}