/*
 * Copyright 2015 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.onosproject.net.intent.impl;

import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.Optional;

import org.junit.Before;
import org.junit.Test;
import org.onlab.packet.MplsLabel;
import org.onosproject.net.DefaultLink;
import org.onosproject.net.DefaultPath;
import org.onosproject.net.Link;
import org.onosproject.net.flow.FlowRuleOperation;
import org.onosproject.net.intent.IntentTestsMocks;
import org.onosproject.net.intent.MplsPathIntent;
import org.onosproject.store.trivial.impl.SimpleLinkStore;

import com.google.common.collect.ImmutableList;

import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.hasSize;
import static org.hamcrest.Matchers.notNullValue;
import static org.onosproject.net.Link.Type.DIRECT;
import static org.onosproject.net.NetTestTools.APP_ID;
import static org.onosproject.net.NetTestTools.PID;

/**
 * Unit tests for path intent installer.
 */
public class  MplsPathIntentInstallerTest extends IntentInstallerTest {

    MplsPathIntentInstaller installer;

    private final Optional<MplsLabel> ingressLabel =
            Optional.of(MplsLabel.mplsLabel(10));
    private final Optional<MplsLabel> egressLabel =
            Optional.of(MplsLabel.mplsLabel(20));

    private final List<Link> links = Arrays.asList(
            new DefaultLink(PID, d1p1, d2p0, DIRECT),
            new DefaultLink(PID, d2p1, d3p1, DIRECT)
    );
    private final int hops = links.size() - 1;
    private MplsPathIntent intent;

    /**
     * Configures objects used in all the test cases.
     */
    @Before
    public void localSetUp() {
        installer = new MplsPathIntentInstaller();
        installer.coreService = testCoreService;
        installer.intentManager = new MockIntentManager(MplsPathIntent.class);
        installer.linkStore = new SimpleLinkStore();
        installer.resourceService = new IntentTestsMocks.MockResourceService();

        intent = new MplsPathIntent(APP_ID, selector, treatment,
                new DefaultPath(PID, links, hops),
                ingressLabel,
                egressLabel,
                ImmutableList.of());
    }

    /**
     * Tests activation and deactivation of the installer.
     */
    @Test
    public void activateDeactivate() {
        installer.activate();
        installer.deactivate();
    }

    /**
     * Tests installation operation of the MPLS path intent installer.
     */
    @Test
    public void install() {
        installer.activate();

        List<Collection<FlowRuleOperation>> operations =
                installer.install(intent);
        assertThat(operations, notNullValue());
        assertThat(operations, hasSize(1));

        Collection<FlowRuleOperation> flowRuleOpsCollection = operations.get(0);
        assertThat(flowRuleOpsCollection, hasSize(hops));
        FlowRuleOperation[] flowRuleOps =
                flowRuleOpsCollection.toArray(new FlowRuleOperation[hops]);

        FlowRuleOperation op0 = flowRuleOps[0];
        checkFlowOperation(op0, FlowRuleOperation.Type.ADD, d2p0.deviceId());

        installer.deactivate();
    }

    /**
     * Checks the uninstall operation of the path intent installer.
     */
    @Test
    public void uninstall() {
        installer.activate();

        List<Collection<FlowRuleOperation>> operations =
                installer.uninstall(intent);
        assertThat(operations, notNullValue());
        assertThat(operations, hasSize(1));

        Collection<FlowRuleOperation> flowRuleOpsCollection = operations.get(0);
        assertThat(flowRuleOpsCollection, hasSize(hops));
        FlowRuleOperation[] flowRuleOps =
                flowRuleOpsCollection.toArray(new FlowRuleOperation[hops]);

        FlowRuleOperation op0 = flowRuleOps[0];
        checkFlowOperation(op0, FlowRuleOperation.Type.REMOVE, d2p0.deviceId());

        installer.deactivate();
    }
}