/*
 * Copyright (c) 2017 Cisco and/or its affiliates.
 *
 * 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 io.fd.honeycomb.infra.bgp.neighbors;

import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import static org.mockito.ArgumentMatchers.any;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;
import static org.mockito.MockitoAnnotations.initMocks;

import com.google.common.util.concurrent.FluentFuture;
import com.google.common.util.concurrent.Futures;
import io.fd.honeycomb.infra.bgp.BgpConfiguration;
import io.fd.honeycomb.translate.write.WriteContext;
import io.fd.honeycomb.translate.write.WriteFailedException;
import java.util.Collections;
import org.junit.Before;
import org.junit.Test;
import org.mockito.Mock;
import org.opendaylight.controller.md.sal.binding.api.BindingTransactionChain;
import org.opendaylight.controller.md.sal.binding.api.DataBroker;
import org.opendaylight.controller.md.sal.binding.api.WriteTransaction;
import org.opendaylight.controller.md.sal.dom.api.DOMDataTreeChangeService;
import org.opendaylight.controller.md.sal.dom.api.DOMDataWriteTransaction;
import org.opendaylight.controller.md.sal.dom.api.DOMTransactionChain;
import org.opendaylight.protocol.bgp.openconfig.spi.BGPTableTypeRegistryConsumer;
import org.opendaylight.protocol.bgp.rib.impl.config.PeerBean;
import org.opendaylight.protocol.bgp.rib.impl.spi.BGPDispatcher;
import org.opendaylight.protocol.bgp.rib.impl.spi.BGPPeerRegistry;
import org.opendaylight.protocol.bgp.rib.impl.spi.RIB;
import org.opendaylight.protocol.bgp.rib.impl.spi.RIBSupportContextRegistry;
import org.opendaylight.protocol.bgp.rib.spi.BGPPeerTracker;
import org.opendaylight.protocol.bgp.rib.spi.policy.BGPRibRoutingPolicy;
import org.opendaylight.yang.gen.v1.http.openconfig.net.yang.bgp.multiprotocol.rev151009.bgp.common.afi.safi.list.AfiSafiBuilder;
import org.opendaylight.yang.gen.v1.http.openconfig.net.yang.bgp.rev151009.bgp.neighbor.group.AfiSafisBuilder;
import org.opendaylight.yang.gen.v1.http.openconfig.net.yang.bgp.rev151009.bgp.neighbor.group.ConfigBuilder;
import org.opendaylight.yang.gen.v1.http.openconfig.net.yang.bgp.rev151009.bgp.neighbors.Neighbor;
import org.opendaylight.yang.gen.v1.http.openconfig.net.yang.bgp.rev151009.bgp.neighbors.NeighborBuilder;
import org.opendaylight.yang.gen.v1.http.openconfig.net.yang.bgp.rev151009.bgp.neighbors.NeighborKey;
import org.opendaylight.yang.gen.v1.http.openconfig.net.yang.bgp.rev151009.bgp.top.bgp.Neighbors;
import org.opendaylight.yang.gen.v1.http.openconfig.net.yang.bgp.types.rev151009.IPV4UNICAST;
import org.opendaylight.yang.gen.v1.http.openconfig.net.yang.bgp.types.rev151009.PeerType;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.AsNumber;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.IpAddress;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv4Address;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.openconfig.extensions.rev180329.NeighborPeerGroupConfig;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.openconfig.extensions.rev180329.NeighborPeerGroupConfigBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev180329.BgpRib;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev180329.RibId;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev180329.bgp.rib.Rib;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev180329.bgp.rib.RibKey;
import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
import org.opendaylight.yangtools.yang.binding.KeyedInstanceIdentifier;
import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;

public class NeighborCustomizerTest {
    private static final IpAddress IP = new IpAddress(new Ipv4Address("10.25.1.9"));
    private static final InstanceIdentifier<Neighbor> ID =
        InstanceIdentifier.create(Neighbors.class).child(Neighbor.class, new NeighborKey(IP));
    private static final KeyedInstanceIdentifier<Rib, RibKey> RIB_IID =
        InstanceIdentifier.create(BgpRib.class).child(Rib.class, new RibKey(new RibId("test-rib-id")));

    @Mock
    private RIB globalRib;
    @Mock
    private BGPPeerRegistry peerRegistry;
    @Mock
    private BGPTableTypeRegistryConsumer tableTypeRegistry;
    @Mock
    private WriteContext ctx;
    @Mock
    private BindingTransactionChain chain;
    @Mock
    private DOMTransactionChain domChain;
    @Mock
    private DOMDataWriteTransaction domTx;
    @Mock
    private WriteTransaction tx;
    @Mock
    private BGPDispatcher dispatcher;

    private NeighborCustomizer customizer;
    @Mock
    private DataBroker dataBroker;
    @Mock
    private BgpConfiguration configuration;

    @Before
    public void setUp() {
        initMocks(this);
        when(globalRib.getYangRibId()).thenReturn(YangInstanceIdentifier.EMPTY);
        when(globalRib.getInstanceIdentifier()).thenReturn(RIB_IID);
        when(globalRib.getRibPolicies()).thenReturn(mock(BGPRibRoutingPolicy.class));

        when(globalRib.createPeerDOMChain(any())).thenReturn(domChain);
        when(domChain.newWriteOnlyTransaction()).thenReturn(domTx);
        when(domTx.commit()).thenReturn(FluentFuture.from(Futures.immediateFuture(null)));

        when(globalRib.createPeerChain(any())).thenReturn(chain);
        when(chain.newWriteOnlyTransaction()).thenReturn(tx);
        when(tx.commit()).thenReturn(mock(FluentFuture.class));
        when(globalRib.getRibSupportContext()).thenReturn(mock(RIBSupportContextRegistry.class));
        when(globalRib.getService()).thenReturn(mock(DOMDataTreeChangeService.class));
        when(globalRib.getDispatcher()).thenReturn(dispatcher);
        when(globalRib.getLocalAs()).thenReturn(new AsNumber(65000L));
        when(globalRib.getDataBroker()).thenReturn(dataBroker);
        when(globalRib.getPeerTracker()).thenReturn(mock(BGPPeerTracker.class));
        when(dispatcher.getBGPPeerRegistry()).thenReturn(peerRegistry);
        when(dataBroker.newWriteOnlyTransaction()).thenReturn(tx);
        when(tx.commit()).thenReturn(FluentFuture.from(Futures.immediateFuture(null)));

        customizer = new NeighborCustomizer(globalRib, peerRegistry, tableTypeRegistry, configuration);
    }

    @Test
    public void testAddAppPeer() throws WriteFailedException {
        final Neighbor neighbor = new NeighborBuilder()
                .setNeighborAddress(IP)
                .setConfig(
                        new ConfigBuilder()
                                .addAugmentation(
                                        NeighborPeerGroupConfig.class,
                                        new NeighborPeerGroupConfigBuilder().setPeerGroup("application-peers").build())
                                .build())
                .build();
        customizer.writeCurrentAttributes(ID, neighbor, ctx);
        assertTrue(customizer.isPeerConfigured(ID));
    }

    @Test
    public void testAddInternalPeer() throws WriteFailedException {
        final Neighbor neighbor = new NeighborBuilder()
            .setNeighborAddress(IP)
            .setAfiSafis(new AfiSafisBuilder()
                .setAfiSafi(Collections.singletonList(
                    new AfiSafiBuilder().setAfiSafiName(IPV4UNICAST.class).build()
                )).build())
            .setConfig(
                new ConfigBuilder()
                    .setPeerType(PeerType.INTERNAL)
                    .build())
            .build();
        customizer.writeCurrentAttributes(ID, neighbor, ctx);
        assertTrue(customizer.isPeerConfigured(ID));
    }

    @Test
    public void testUpdate() throws WriteFailedException {
        final PeerBean peer = mock(PeerBean.class);
        customizer.addPeer(ID, peer);
        final Neighbor before = mock(Neighbor.class);
        final Neighbor after = mock(Neighbor.class);
        customizer.updateCurrentAttributes(ID, before, after, ctx);
        verify(peer).closeServiceInstance();
        verify(peer).close();
        verify(peer).start(globalRib, after, NeighborCustomizer.bgpIid, configuration, tableTypeRegistry);
    }

    @Test
    public void testDelete() throws WriteFailedException {
        final PeerBean peer = mock(PeerBean.class);
        customizer.addPeer(ID, peer);
        final Neighbor before = mock(Neighbor.class);
        customizer.deleteCurrentAttributes(ID, before, ctx);
        verify(peer).closeServiceInstance();
        verify(peer).close();
        assertFalse(customizer.isPeerConfigured(ID));
    }
}