package org.onlab.onos.sdnip;

import static org.easymock.EasyMock.anyObject;
import static org.easymock.EasyMock.createMock;
import static org.easymock.EasyMock.expect;
import static org.easymock.EasyMock.expectLastCall;
import static org.easymock.EasyMock.replay;
import static org.easymock.EasyMock.reset;
import static org.easymock.EasyMock.verify;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

import java.util.HashSet;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;

import org.junit.Before;
import org.junit.Test;
import org.onlab.junit.TestUtils;
import org.onlab.junit.TestUtils.TestUtilsException;
import org.onlab.onos.core.ApplicationId;
import org.onlab.onos.net.ConnectPoint;
import org.onlab.onos.net.DefaultHost;
import org.onlab.onos.net.DeviceId;
import org.onlab.onos.net.Host;
import org.onlab.onos.net.HostId;
import org.onlab.onos.net.HostLocation;
import org.onlab.onos.net.PortNumber;
import org.onlab.onos.net.flow.DefaultTrafficSelector;
import org.onlab.onos.net.flow.DefaultTrafficTreatment;
import org.onlab.onos.net.flow.TrafficSelector;
import org.onlab.onos.net.flow.TrafficTreatment;
import org.onlab.onos.net.host.HostListener;
import org.onlab.onos.net.host.HostService;
import org.onlab.onos.net.host.InterfaceIpAddress;
import org.onlab.onos.net.intent.Intent;
import org.onlab.onos.net.intent.IntentService;
import org.onlab.onos.net.intent.MultiPointToSinglePointIntent;
import org.onlab.onos.net.provider.ProviderId;
import org.onlab.onos.sdnip.config.Interface;
import org.onlab.packet.Ethernet;
import org.onlab.packet.IpAddress;
import org.onlab.packet.IpPrefix;
import org.onlab.packet.MacAddress;
import org.onlab.packet.VlanId;

import com.google.common.collect.Sets;
import com.googlecode.concurrenttrees.radix.node.concrete.DefaultByteArrayNodeFactory;
import com.googlecode.concurrenttrees.radixinverted.ConcurrentInvertedRadixTree;
import com.googlecode.concurrenttrees.radixinverted.InvertedRadixTree;

/**
 * This class tests the intent synchronization function in Router class.
 */
public class IntentSyncTest {

    private InterfaceService interfaceService;
    private IntentService intentService;
    private HostService hostService;

    private static final ConnectPoint SW1_ETH1 = new ConnectPoint(
            DeviceId.deviceId("of:0000000000000001"),
            PortNumber.portNumber(1));

    private static final ConnectPoint SW2_ETH1 = new ConnectPoint(
            DeviceId.deviceId("of:0000000000000002"),
            PortNumber.portNumber(1));

    private static final ConnectPoint SW3_ETH1 = new ConnectPoint(
            DeviceId.deviceId("of:0000000000000003"),
            PortNumber.portNumber(1));

    private Router router;

    private static final ApplicationId APPID = new ApplicationId() {
        @Override
        public short id() {
            return 1;
        }

        @Override
        public String name() {
            return "SDNIP";
        }
    };

    @Before
    public void setUp() throws Exception {
        setUpInterfaceService();
        setUpHostService();
        intentService = createMock(IntentService.class);

        router = new Router(APPID, intentService,
                hostService, null, interfaceService);
    }

    /**
     * Sets up InterfaceService.
     */
    private void setUpInterfaceService() {

        interfaceService = createMock(InterfaceService.class);

        Set<Interface> interfaces = Sets.newHashSet();

        Set<InterfaceIpAddress> interfaceIpAddresses1 = Sets.newHashSet();
        interfaceIpAddresses1.add(new InterfaceIpAddress(
                IpAddress.valueOf("192.168.10.101"),
                IpPrefix.valueOf("192.168.10.0/24")));
        Interface sw1Eth1 = new Interface(SW1_ETH1,
                interfaceIpAddresses1, MacAddress.valueOf("00:00:00:00:00:01"));
        interfaces.add(sw1Eth1);

        Set<InterfaceIpAddress> interfaceIpAddresses2 = Sets.newHashSet();
        interfaceIpAddresses2.add(new InterfaceIpAddress(
                IpAddress.valueOf("192.168.20.101"),
                IpPrefix.valueOf("192.168.20.0/24")));
        Interface sw2Eth1 = new Interface(SW2_ETH1,
                interfaceIpAddresses2, MacAddress.valueOf("00:00:00:00:00:02"));
        interfaces.add(sw2Eth1);

        Set<InterfaceIpAddress> interfaceIpAddresses3 = Sets.newHashSet();
        interfaceIpAddresses3.add(new InterfaceIpAddress(
                IpAddress.valueOf("192.168.30.101"),
                IpPrefix.valueOf("192.168.30.0/24")));
        Interface sw3Eth1 = new Interface(SW3_ETH1,
                interfaceIpAddresses3, MacAddress.valueOf("00:00:00:00:00:03"));
        interfaces.add(sw3Eth1);

        expect(interfaceService.getInterface(SW1_ETH1)).andReturn(
                sw1Eth1).anyTimes();
        expect(interfaceService.getInterface(SW2_ETH1)).andReturn(
                sw2Eth1).anyTimes();
        expect(interfaceService.getInterface(SW3_ETH1)).andReturn(
                sw3Eth1).anyTimes();
        expect(interfaceService.getInterfaces()).andReturn(
                interfaces).anyTimes();
        replay(interfaceService);
    }

    /**
     * Sets up the host service with details of hosts.
     */
    private void setUpHostService() {
        hostService = createMock(HostService.class);

        hostService.addListener(anyObject(HostListener.class));
        expectLastCall().anyTimes();

        IpAddress host1Address = IpAddress.valueOf("192.168.10.1");
        Host host1 = new DefaultHost(ProviderId.NONE, HostId.NONE,
                MacAddress.valueOf("00:00:00:00:00:01"), VlanId.NONE,
                new HostLocation(SW1_ETH1, 1),
                        Sets.newHashSet(host1Address));

        expect(hostService.getHostsByIp(host1Address))
                .andReturn(Sets.newHashSet(host1)).anyTimes();
        hostService.startMonitoringIp(host1Address);
        expectLastCall().anyTimes();


        IpAddress host2Address = IpAddress.valueOf("192.168.20.1");
        Host host2 = new DefaultHost(ProviderId.NONE, HostId.NONE,
                MacAddress.valueOf("00:00:00:00:00:02"), VlanId.NONE,
                new HostLocation(SW2_ETH1, 1),
                        Sets.newHashSet(host2Address));

        expect(hostService.getHostsByIp(host2Address))
                .andReturn(Sets.newHashSet(host2)).anyTimes();
        hostService.startMonitoringIp(host2Address);
        expectLastCall().anyTimes();


        IpAddress host3Address = IpAddress.valueOf("192.168.30.1");
        Host host3 = new DefaultHost(ProviderId.NONE, HostId.NONE,
                MacAddress.valueOf("00:00:00:00:00:03"), VlanId.NONE,
                new HostLocation(SW3_ETH1, 1),
                        Sets.newHashSet(host3Address));

        expect(hostService.getHostsByIp(host3Address))
                .andReturn(Sets.newHashSet(host3)).anyTimes();
        hostService.startMonitoringIp(host3Address);
        expectLastCall().anyTimes();


        replay(hostService);
    }

    /**
     * This method tests the behavior of intent Synchronizer.
     *
     * @throws TestUtilsException
     */
    @Test
    public void testIntentSync() throws TestUtilsException {

        //
        // Construct routes and intents.
        // This test simulates the following cases during the master change
        // time interval:
        // 1. RouteEntry1 did not change and the intent also did not change.
        // 2. RouteEntry2 was deleted, but the intent was not deleted.
        // 3. RouteEntry3 was newly added, and the intent was also submitted.
        // 4. RouteEntry4 was updated to RouteEntry4Update, and the intent was
        // also updated to a new one.
        // 5. RouteEntry5 did not change, but its intent id changed.
        // 6. RouteEntry6 was newly added, but the intent was not submitted.
        //
        RouteEntry routeEntry1 = new RouteEntry(
                IpPrefix.valueOf("1.1.1.0/24"),
                IpAddress.valueOf("192.168.10.1"));

        RouteEntry routeEntry2 = new RouteEntry(
                IpPrefix.valueOf("2.2.2.0/24"),
                IpAddress.valueOf("192.168.20.1"));

        RouteEntry routeEntry3 = new RouteEntry(
                IpPrefix.valueOf("3.3.3.0/24"),
                IpAddress.valueOf("192.168.30.1"));

        RouteEntry routeEntry4 = new RouteEntry(
                IpPrefix.valueOf("4.4.4.0/24"),
                IpAddress.valueOf("192.168.30.1"));

        RouteEntry routeEntry4Update = new RouteEntry(
                IpPrefix.valueOf("4.4.4.0/24"),
                IpAddress.valueOf("192.168.20.1"));

        RouteEntry routeEntry5 = new RouteEntry(
                IpPrefix.valueOf("5.5.5.0/24"),
                IpAddress.valueOf("192.168.10.1"));

        RouteEntry routeEntry6 = new RouteEntry(
                IpPrefix.valueOf("6.6.6.0/24"),
                IpAddress.valueOf("192.168.10.1"));

        MultiPointToSinglePointIntent intent1 = intentBuilder(
                routeEntry1.prefix(), "00:00:00:00:00:01", SW1_ETH1);
        MultiPointToSinglePointIntent intent2 = intentBuilder(
                routeEntry2.prefix(), "00:00:00:00:00:02", SW2_ETH1);
        MultiPointToSinglePointIntent intent3 = intentBuilder(
                routeEntry3.prefix(), "00:00:00:00:00:03", SW3_ETH1);
        MultiPointToSinglePointIntent intent4 = intentBuilder(
                routeEntry4.prefix(), "00:00:00:00:00:03", SW3_ETH1);
        MultiPointToSinglePointIntent intent4Update = intentBuilder(
                routeEntry4Update.prefix(), "00:00:00:00:00:02", SW2_ETH1);
        MultiPointToSinglePointIntent intent5 = intentBuilder(
                routeEntry5.prefix(), "00:00:00:00:00:01",  SW1_ETH1);

        // Compose a intent, which is equal to intent5 but the id is different.
        MultiPointToSinglePointIntent intent5New =
                staticIntentBuilder(intent5, routeEntry5, "00:00:00:00:00:01");
        assertTrue(TestUtils.callMethod(router,
                "compareMultiPointToSinglePointIntents",
                new Class<?>[] {MultiPointToSinglePointIntent.class,
                MultiPointToSinglePointIntent.class},
                intent5, intent5New).equals(true));
        assertTrue(!intent5.equals(intent5New));

        MultiPointToSinglePointIntent intent6 = intentBuilder(
                routeEntry6.prefix(), "00:00:00:00:00:01",  SW1_ETH1);

        // Set up the bgpRoutes and pushedRouteIntents fields in Router class
        InvertedRadixTree<RouteEntry> bgpRoutes =
                new ConcurrentInvertedRadixTree<>(
                new DefaultByteArrayNodeFactory());
        bgpRoutes.put(RouteEntry.createBinaryString(routeEntry1.prefix()),
                routeEntry1);
        bgpRoutes.put(RouteEntry.createBinaryString(routeEntry3.prefix()),
                routeEntry3);
        bgpRoutes.put(RouteEntry.createBinaryString(routeEntry4Update.prefix()),
                routeEntry4Update);
        bgpRoutes.put(RouteEntry.createBinaryString(routeEntry5.prefix()),
                routeEntry5);
        bgpRoutes.put(RouteEntry.createBinaryString(routeEntry6.prefix()),
                routeEntry6);
        TestUtils.setField(router, "bgpRoutes", bgpRoutes);

        ConcurrentHashMap<IpPrefix, MultiPointToSinglePointIntent>
        pushedRouteIntents =  new ConcurrentHashMap<>();
        pushedRouteIntents.put(routeEntry1.prefix(), intent1);
        pushedRouteIntents.put(routeEntry3.prefix(), intent3);
        pushedRouteIntents.put(routeEntry4Update.prefix(), intent4Update);
        pushedRouteIntents.put(routeEntry5.prefix(), intent5New);
        pushedRouteIntents.put(routeEntry6.prefix(), intent6);
        TestUtils.setField(router, "pushedRouteIntents", pushedRouteIntents);

        // Set up expectation
        reset(intentService);
        Set<Intent> intents = new HashSet<Intent>();
        intents.add(intent1);
        intents.add(intent2);
        intents.add(intent4);
        intents.add(intent5);
        expect(intentService.getIntents()).andReturn(intents).anyTimes();

        intentService.withdraw(intent2);
        intentService.submit(intent3);
        intentService.withdraw(intent4);
        intentService.submit(intent4Update);
        intentService.submit(intent6);
        replay(intentService);

        // Start the test
        router.leaderChanged(true);
        TestUtils.callMethod(router, "syncIntents", new Class<?>[] {});

        // Verify
        assertEquals(router.getRoutes().size(), 5);
        assertTrue(router.getRoutes().contains(routeEntry1));
        assertTrue(router.getRoutes().contains(routeEntry3));
        assertTrue(router.getRoutes().contains(routeEntry4Update));
        assertTrue(router.getRoutes().contains(routeEntry5));
        assertTrue(router.getRoutes().contains(routeEntry6));

        assertEquals(router.getPushedRouteIntents().size(), 5);
        assertTrue(router.getPushedRouteIntents().contains(intent1));
        assertTrue(router.getPushedRouteIntents().contains(intent3));
        assertTrue(router.getPushedRouteIntents().contains(intent4Update));
        assertTrue(router.getPushedRouteIntents().contains(intent5));
        assertTrue(router.getPushedRouteIntents().contains(intent6));

        verify(intentService);
    }

    /**
     * MultiPointToSinglePointIntent builder.
     *
     * @param ipPrefix the ipPrefix to match
     * @param nextHopMacAddress to which the destination MAC address in packet
     * should be rewritten
     * @param egressPoint to which packets should be sent
     * @return the constructed MultiPointToSinglePointIntent
     */
    private MultiPointToSinglePointIntent intentBuilder(IpPrefix ipPrefix,
            String nextHopMacAddress, ConnectPoint egressPoint) {

        TrafficSelector.Builder selectorBuilder =
                DefaultTrafficSelector.builder();
        selectorBuilder.matchEthType(Ethernet.TYPE_IPV4).matchIPDst(ipPrefix);

        TrafficTreatment.Builder treatmentBuilder =
                DefaultTrafficTreatment.builder();
        treatmentBuilder.setEthDst(MacAddress.valueOf(nextHopMacAddress));

        Set<ConnectPoint> ingressPoints = new HashSet<ConnectPoint>();
        for (Interface intf : interfaceService.getInterfaces()) {
            if (!intf.equals(interfaceService.getInterface(egressPoint))) {
                ConnectPoint srcPort = intf.connectPoint();
                ingressPoints.add(srcPort);
            }
        }
        MultiPointToSinglePointIntent intent =
                new MultiPointToSinglePointIntent(APPID,
                        selectorBuilder.build(), treatmentBuilder.build(),
                        ingressPoints, egressPoint);
        return intent;
    }

    /**
     * A static MultiPointToSinglePointIntent builder, the returned intent is
     * equal to the input intent except that the id is different.
     *
     *
     * @param intent the intent to be used for building a new intent
     * @param routeEntry the relative routeEntry of the intent
     * @return the newly constructed MultiPointToSinglePointIntent
     * @throws TestUtilsException
     */
    private  MultiPointToSinglePointIntent staticIntentBuilder(
            MultiPointToSinglePointIntent intent, RouteEntry routeEntry,
            String nextHopMacAddress) throws TestUtilsException {

        // Use a different egress ConnectPoint with that in intent
        // to generate a different id
        MultiPointToSinglePointIntent intentNew = intentBuilder(
                routeEntry.prefix(), nextHopMacAddress, SW2_ETH1);
        TestUtils.setField(intentNew, "egressPoint", intent.egressPoint());
        TestUtils.setField(intentNew,
                "ingressPoints", intent.ingressPoints());
        return intentNew;
    }
}