/*
 * Copyright (c) 2015 Cisco Systems, Inc. and others.  All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html
 */

package org.opendaylight.bgpcep.pcep.topology.provider;


import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.opendaylight.protocol.pcep.pcc.mock.spi.MsgBuilderUtil.createLsp;
import static org.opendaylight.protocol.pcep.pcc.mock.spi.MsgBuilderUtil.createPath;
import static org.opendaylight.protocol.util.CheckUtil.readDataOperational;

import com.google.common.base.Optional;
import java.math.BigInteger;
import java.util.Collections;
import org.junit.Before;
import org.junit.Test;
import org.opendaylight.protocol.pcep.PCEPSession;
import org.opendaylight.protocol.pcep.pcc.mock.spi.MsgBuilderUtil;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.controller.pcep.sync.optimizations.rev150714.Tlvs3;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.controller.pcep.sync.optimizations.rev150714.Tlvs3Builder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.controller.pcep.sync.optimizations.rev150714.lsp.db.version.tlv.LspDbVersion;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.controller.pcep.sync.optimizations.rev150714.lsp.db.version.tlv.LspDbVersionBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.crabbe.initiated.rev131126.Stateful1;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.crabbe.initiated.rev131126.Stateful1Builder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.ietf.stateful.rev131222.OperationalStatus;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.ietf.stateful.rev131222.Pcrpt;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.ietf.stateful.rev131222.PlspId;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.ietf.stateful.rev131222.SymbolicPathName;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.ietf.stateful.rev131222.Tlvs1;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.ietf.stateful.rev131222.Tlvs1Builder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.ietf.stateful.rev131222.lsp.identifiers.tlv.LspIdentifiersBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.ietf.stateful.rev131222.lsp.object.LspBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.ietf.stateful.rev131222.stateful.capability.tlv.StatefulBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.ietf.stateful.rev131222.symbolic.path.name.tlv.SymbolicPathNameBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.open.object.Open;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.open.object.OpenBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.open.object.open.TlvsBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev150820.LspId;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.topology.pcep.rev131024.PccSyncState;

public class IncrementalSynchronizationProcedureTest extends AbstractPCEPSessionTest<Stateful07TopologySessionListenerFactory> {

    private Stateful07TopologySessionListener listener;

    @Override
    @Before
    public void setUp() throws Exception {
        super.setUp();
        this.listener = (Stateful07TopologySessionListener) getSessionListener();
    }

    @Test
    public void testStateSynchronizationPerformed() throws Exception {
        PCEPSession session = getPCEPSession(getOpen(null), getOpen(null));
        this.listener.onSessionUp(session);
        //report LSP + LSP-DB version number
        final Pcrpt pcRpt = getPcrpt(1L, "test");
        this.listener.onMessage(session, pcRpt);
        readDataOperational(getDataBroker(), this.pathComputationClientIId, pcc -> {
            assertFalse(pcc.getReportedLsp().isEmpty());
            return pcc;
        });

        this.listener.onSessionDown(session, new IllegalArgumentException());
        this.listener = (Stateful07TopologySessionListener) getSessionListener();

        //session up - expect sync (LSP-DBs do not match)
        final LspDbVersion localDbVersion = new LspDbVersionBuilder().setLspDbVersionValue(BigInteger.valueOf(2L)).build();
        session = getPCEPSession(getOpen(localDbVersion), getOpen(null));
        this.listener.onSessionUp(session);
        readDataOperational(getDataBroker(), this.pathComputationClientIId, pcc -> {
            //check node - IncrementalSync state
            assertEquals(PccSyncState.IncrementalSync, pcc.getStateSync());
            //check reported LSP - persisted from previous session
            assertFalse(pcc.getReportedLsp().isEmpty());
            return pcc;
        });

        //report LSP2 + LSP-DB version number 2
        final Pcrpt pcRpt2 = getPcrpt(2L,"testsecond");
        this.listener.onMessage(session, pcRpt2);
        readDataOperational(getDataBroker(), this.pathComputationClientIId, pcc -> {
            //check node - synchronized
            assertEquals(PccSyncState.IncrementalSync, pcc.getStateSync());
            //check reported LSP is not empty
            assertEquals(2, pcc.getReportedLsp().size());
            return pcc;
        });

        //sync rpt + LSP-DB
        final Pcrpt syncMsg = getSyncPcrt();
        this.listener.onMessage(session, syncMsg);
        readDataOperational(getDataBroker(), this.pathComputationClientIId, pcc -> {
            //check node - synchronized
            assertEquals(PccSyncState.Synchronized, pcc.getStateSync());
            //check reported LSP is empty, LSP state from previous session was purged
            assertEquals(2, pcc.getReportedLsp().size());
            return pcc;
        });

        //report LSP3 + LSP-DB version number 4
        final Pcrpt pcRpt3 = getPcrpt(3L,"testthird");
        this.listener.onMessage(session, pcRpt3);
        readDataOperational(getDataBroker(), this.pathComputationClientIId, pcc -> {
            //check node - synchronized
            assertEquals(PccSyncState.Synchronized, pcc.getStateSync());
            assertEquals(3,pcc.getReportedLsp().size());
            return pcc;
        });
    }

    private Open getOpen(final LspDbVersion dbVersion) {
        return new OpenBuilder(super.getLocalPref()).setTlvs(new TlvsBuilder().addAugmentation(Tlvs1.class,
            new Tlvs1Builder().setStateful(new StatefulBuilder().addAugmentation(Stateful1.class,
                new Stateful1Builder().setInitiation(Boolean.TRUE).build())
            .addAugmentation(org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.controller.pcep.sync.
                optimizations.rev150714.Stateful1.class, new org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml
                .ns.yang.controller.pcep.sync.optimizations.rev150714.Stateful1Builder()
                .setIncludeDbVersion(Boolean.TRUE).setDeltaLspSyncCapability(Boolean.TRUE).build())
            .build()).build()).addAugmentation(Tlvs3.class, new Tlvs3Builder().setLspDbVersion(dbVersion).build())
            .build()).build();
    }

    private Pcrpt getPcrpt(final Long val, final String pathname) {
        return MsgBuilderUtil.createPcRtpMessage(new LspBuilder().setPlspId(new PlspId(val)).setTlvs(
            new org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.ietf.stateful.rev131222.lsp.
                object.lsp.TlvsBuilder().setLspIdentifiers(new LspIdentifiersBuilder().setLspId(new LspId(val)).build())
                .setSymbolicPathName(new SymbolicPathNameBuilder().setPathName(new SymbolicPathName(
                    pathname.getBytes())).build()).addAugmentation(org.opendaylight.yang.gen.v1.urn.opendaylight.params
                .xml.ns.yang.controller.pcep.sync.optimizations.rev150714.Tlvs1.class, new org.opendaylight.yang.gen.v1.
                urn.opendaylight.params.xml.ns.yang.controller.pcep.sync.optimizations.rev150714.Tlvs1Builder()
                .setLspDbVersion(new LspDbVersionBuilder().setLspDbVersionValue(BigInteger.valueOf(val)).build())
                .build()).build()).setPlspId(new PlspId(val)
        ).setSync(true).setRemove(false).setOperational(OperationalStatus.Active).build(), Optional.absent(),
            createPath(Collections.emptyList()));
    }

    private Pcrpt getSyncPcrt() {
        return MsgBuilderUtil.createPcRtpMessage(createLsp(0, false, Optional.of(
                new org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.ietf.stateful.rev131222.
                    lsp.object.lsp.TlvsBuilder().addAugmentation(org.opendaylight.yang.gen.v1.urn.opendaylight.params.
                        xml.ns.yang.controller.pcep.sync.optimizations.rev150714.Tlvs1.class,
                    new org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.controller.pcep.sync
                        .optimizations.rev150714.Tlvs1Builder().setLspDbVersion(new LspDbVersionBuilder()
                        .setLspDbVersionValue(BigInteger.valueOf(3L)).build()).build()).build()),
            true, false), Optional.absent(),
            createPath(Collections.emptyList()));
    }
}