/*
 * Copyright 2014-present 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.flow;

import java.util.List;
import java.util.Set;

import com.google.common.collect.Lists;
import org.hamcrest.Description;
import org.hamcrest.Factory;
import org.hamcrest.Matcher;
import org.hamcrest.TypeSafeMatcher;
import org.junit.Test;
import org.onlab.packet.Ethernet;
import org.onlab.packet.Ip6Address;
import org.onlab.packet.IpPrefix;
import org.onlab.packet.MacAddress;
import org.onlab.packet.MplsLabel;
import org.onlab.packet.TpPort;
import org.onlab.packet.VlanId;
import org.onosproject.net.ChannelSpacing;
import org.onosproject.net.DeviceId;
import org.onosproject.net.GridType;
import org.onosproject.net.OchSignal;
import org.onosproject.net.PortNumber;
import org.onosproject.net.flow.criteria.Criteria;
import org.onosproject.net.flow.criteria.Criterion;

import com.google.common.testing.EqualsTester;
import org.onosproject.net.flow.criteria.ExtensionSelector;
import org.onosproject.net.flow.criteria.ExtensionSelectorType;

import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.hasSize;
import static org.hamcrest.Matchers.notNullValue;
import static org.hamcrest.Matchers.is;
import static org.hamcrest.Matchers.equalTo;
import static org.onlab.junit.ImmutableClassChecker.assertThatClassIsImmutable;
import static org.onosproject.net.flow.criteria.Criterion.Type;

/**
 * Unit tests for default traffic selector class.
 */
public class DefaultTrafficSelectorTest {

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

    /**
     * Tests equals(), hashCode() and toString() methods.
     */
    @Test
    public void testEquals() {
        final TrafficSelector selector1 = DefaultTrafficSelector.builder()
                .add(Criteria.matchLambda(new OchSignal(GridType.FLEX, ChannelSpacing.CHL_100GHZ, 1, 1)))
                .build();
        final TrafficSelector sameAsSelector1 = DefaultTrafficSelector.builder()
                .add(Criteria.matchLambda(new OchSignal(GridType.FLEX, ChannelSpacing.CHL_100GHZ, 1, 1)))
                .build();
        final TrafficSelector selector2 = DefaultTrafficSelector.builder()
                .add(Criteria.matchLambda(new OchSignal(GridType.FLEX, ChannelSpacing.CHL_50GHZ, 1, 1)))
                .build();

        new EqualsTester()
                .addEqualityGroup(selector1, sameAsSelector1)
                .addEqualityGroup(selector2)
                .testEquals();
    }

    /**
     * Tests criteria order is consistent.
     */
    @Test
    public void testCriteriaOrder() {
        final TrafficSelector selector1 = DefaultTrafficSelector.builder()
                .matchInPort(PortNumber.portNumber(11))
                .matchEthType(Ethernet.TYPE_ARP)
                .build();
        final TrafficSelector selector2 = DefaultTrafficSelector.builder()
                .matchEthType(Ethernet.TYPE_ARP)
                .matchInPort(PortNumber.portNumber(11))
                .build();

        List<Criterion> criteria1 = Lists.newArrayList(selector1.criteria());
        List<Criterion> criteria2 = Lists.newArrayList(selector2.criteria());

        new EqualsTester().addEqualityGroup(criteria1, criteria2).testEquals();
    }

    /**
     * Hamcrest matcher to check that a selector contains a
     * Criterion with the specified type.
     */
    public static final class CriterionExistsMatcher
           extends TypeSafeMatcher<TrafficSelector> {
        private final Criterion.Type type;

        /**
         * Constructs a matcher for the given criterion type.
         *
         * @param typeValue criterion type to match
         */
        public CriterionExistsMatcher(Criterion.Type typeValue) {
            type = typeValue;
        }

        @Override
        public boolean matchesSafely(TrafficSelector selector) {
            final Set<Criterion> criteria = selector.criteria();

            return notNullValue().matches(criteria) &&
                   hasSize(1).matches(criteria) &&
                   notNullValue().matches(selector.getCriterion(type));
        }

        @Override
        public void describeTo(Description description) {
            description.appendText("a criterion with type \" ").
                    appendText(type.toString()).
                    appendText("\"");
        }
    }


    /**
     * Creates a criterion type matcher.  Returns a matcher
     * for a criterion with the given type.
     *
     * @param type type of Criterion to match
     * @return Matcher object
     */
    @Factory
    public static Matcher<TrafficSelector> hasCriterionWithType(Criterion.Type type) {
        return new CriterionExistsMatcher(type);
    }


    /**
     * Tests the builder functions that add specific criteria.
     */
    @Test
    public void testCriteriaCreation() {
        TrafficSelector selector;

        final long longValue = 0x12345678;
        final int intValue = 22;
        final short shortValue = 33;
        final byte byteValue = 44;
        final byte dscpValue = 0xf;
        final byte ecnValue = 3;
        final MacAddress macValue = MacAddress.valueOf("11:22:33:44:55:66");
        final IpPrefix ipPrefixValue = IpPrefix.valueOf("192.168.1.0/24");
        final IpPrefix ipv6PrefixValue = IpPrefix.valueOf("fe80::1/64");
        final Ip6Address ipv6AddressValue = Ip6Address.valueOf("fe80::1");

        selector = DefaultTrafficSelector.builder()
                .matchInPort(PortNumber.portNumber(11)).build();
        assertThat(selector, hasCriterionWithType(Type.IN_PORT));

        selector = DefaultTrafficSelector.builder()
                .matchInPhyPort(PortNumber.portNumber(11)).build();
        assertThat(selector, hasCriterionWithType(Type.IN_PHY_PORT));

        selector = DefaultTrafficSelector.builder()
                .matchMetadata(longValue).build();
        assertThat(selector, hasCriterionWithType(Type.METADATA));

        selector = DefaultTrafficSelector.builder()
                .matchEthDst(macValue).build();
        assertThat(selector, hasCriterionWithType(Type.ETH_DST));

        selector = DefaultTrafficSelector.builder()
                .matchEthSrc(macValue).build();
        assertThat(selector, hasCriterionWithType(Type.ETH_SRC));

        selector = DefaultTrafficSelector.builder()
                .matchEthType(shortValue).build();
        assertThat(selector, hasCriterionWithType(Type.ETH_TYPE));

        selector = DefaultTrafficSelector.builder()
                .matchVlanId(VlanId.vlanId(shortValue)).build();
        assertThat(selector, hasCriterionWithType(Type.VLAN_VID));

        selector = DefaultTrafficSelector.builder()
                .matchVlanPcp(byteValue).build();
        assertThat(selector, hasCriterionWithType(Type.VLAN_PCP));

        selector = DefaultTrafficSelector.builder()
                .matchIPDscp(dscpValue).build();
        assertThat(selector, hasCriterionWithType(Type.IP_DSCP));

        selector = DefaultTrafficSelector.builder()
                .matchIPEcn(ecnValue).build();
        assertThat(selector, hasCriterionWithType(Type.IP_ECN));

        selector = DefaultTrafficSelector.builder()
                .matchIPProtocol(byteValue).build();
        assertThat(selector, hasCriterionWithType(Type.IP_PROTO));

        selector = DefaultTrafficSelector.builder()
                .matchIPSrc(ipPrefixValue).build();
        assertThat(selector, hasCriterionWithType(Type.IPV4_SRC));

        selector = DefaultTrafficSelector.builder()
                .matchIPDst(ipPrefixValue).build();
        assertThat(selector, hasCriterionWithType(Type.IPV4_DST));

        selector = DefaultTrafficSelector.builder()
                .matchTcpSrc(TpPort.tpPort(intValue)).build();
        assertThat(selector, hasCriterionWithType(Type.TCP_SRC));

        selector = DefaultTrafficSelector.builder()
                .matchTcpDst(TpPort.tpPort(intValue)).build();
        assertThat(selector, hasCriterionWithType(Type.TCP_DST));

        selector = DefaultTrafficSelector.builder()
                .matchUdpSrc(TpPort.tpPort(intValue)).build();
        assertThat(selector, hasCriterionWithType(Type.UDP_SRC));

        selector = DefaultTrafficSelector.builder()
                .matchUdpDst(TpPort.tpPort(intValue)).build();
        assertThat(selector, hasCriterionWithType(Type.UDP_DST));

        selector = DefaultTrafficSelector.builder()
                .matchSctpSrc(TpPort.tpPort(intValue)).build();
        assertThat(selector, hasCriterionWithType(Type.SCTP_SRC));

        selector = DefaultTrafficSelector.builder()
                .matchSctpDst(TpPort.tpPort(intValue)).build();
        assertThat(selector, hasCriterionWithType(Type.SCTP_DST));

        selector = DefaultTrafficSelector.builder()
                .matchIcmpType(byteValue).build();
        assertThat(selector, hasCriterionWithType(Type.ICMPV4_TYPE));

        selector = DefaultTrafficSelector.builder()
                .matchIcmpCode(byteValue).build();
        assertThat(selector, hasCriterionWithType(Type.ICMPV4_CODE));

        selector = DefaultTrafficSelector.builder()
                .matchIPv6Src(ipv6PrefixValue).build();
        assertThat(selector, hasCriterionWithType(Type.IPV6_SRC));

        selector = DefaultTrafficSelector.builder()
                .matchIPv6Dst(ipv6PrefixValue).build();
        assertThat(selector, hasCriterionWithType(Type.IPV6_DST));

        selector = DefaultTrafficSelector.builder()
                .matchIPv6FlowLabel(intValue).build();
        assertThat(selector, hasCriterionWithType(Type.IPV6_FLABEL));

        selector = DefaultTrafficSelector.builder()
                .matchIcmpv6Type(byteValue).build();
        assertThat(selector, hasCriterionWithType(Type.ICMPV6_TYPE));

        selector = DefaultTrafficSelector.builder()
                .matchIPv6NDTargetAddress(ipv6AddressValue).build();
        assertThat(selector, hasCriterionWithType(Type.IPV6_ND_TARGET));

        selector = DefaultTrafficSelector.builder()
                .matchIPv6NDSourceLinkLayerAddress(macValue).build();
        assertThat(selector, hasCriterionWithType(Type.IPV6_ND_SLL));

        selector = DefaultTrafficSelector.builder()
                .matchIPv6NDTargetLinkLayerAddress(macValue).build();
        assertThat(selector, hasCriterionWithType(Type.IPV6_ND_TLL));

        selector = DefaultTrafficSelector.builder()
                .matchMplsLabel(MplsLabel.mplsLabel(3)).build();
        assertThat(selector, hasCriterionWithType(Type.MPLS_LABEL));

        selector = DefaultTrafficSelector.builder()
                .matchIPv6ExthdrFlags(Criterion.IPv6ExthdrFlags.NONEXT.getValue()).build();
        assertThat(selector, hasCriterionWithType(Type.IPV6_EXTHDR));

        selector = DefaultTrafficSelector.builder()
                .add(Criteria.matchLambda(new OchSignal(GridType.DWDM, ChannelSpacing.CHL_100GHZ, 1, 1))).build();
        assertThat(selector, hasCriterionWithType(Type.OCH_SIGID));

        selector = DefaultTrafficSelector.builder()
                .matchEthDst(macValue)
                .extension(new MockExtensionSelector(1), DeviceId.NONE)
                .extension(new MockExtensionSelector(2), DeviceId.NONE)
                .build();
        assertThat(selector.criteria().size(), is(equalTo(3)));
    }

    private class MockExtensionSelector extends AbstractExtension implements ExtensionSelector {

        ExtensionSelectorType type;

        MockExtensionSelector(int typeInt) {
            this.type = new ExtensionSelectorType(typeInt);
        }

        @Override
        public ExtensionSelectorType type() {
            return type;
        }

        @Override
        public byte[] serialize() {
            return new byte[0];
        }

        @Override
        public void deserialize(byte[] data) {

        }
    }
}