/*
 * 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.hc2vpp.vpp.classifier.write;

import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
import static org.mockito.Mockito.doReturn;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

import java.util.Optional;
import io.fd.hc2vpp.common.test.write.WriterCustomizerTest;
import io.fd.hc2vpp.common.translate.util.NamingContext;
import io.fd.hc2vpp.vpp.classifier.context.VppClassifierContextManager;
import io.fd.honeycomb.translate.write.WriteFailedException;
import io.fd.jvpp.VppBaseCallException;
import io.fd.jvpp.core.dto.ClassifyAddDelSession;
import io.fd.jvpp.core.dto.ClassifyAddDelSessionReply;
import org.junit.Test;
import org.mockito.ArgumentMatchers;
import org.mockito.Mock;
import org.opendaylight.yang.gen.v1.http.fd.io.hc2vpp.yang.vpp.classifier.rev170327.OpaqueIndex;
import org.opendaylight.yang.gen.v1.http.fd.io.hc2vpp.yang.vpp.classifier.rev170327.PacketHandlingAction;
import org.opendaylight.yang.gen.v1.http.fd.io.hc2vpp.yang.vpp.classifier.rev170327.VppClassifier;
import org.opendaylight.yang.gen.v1.http.fd.io.hc2vpp.yang.vpp.classifier.rev170327.VppNode;
import org.opendaylight.yang.gen.v1.http.fd.io.hc2vpp.yang.vpp.classifier.rev170327.VppNodeName;
import org.opendaylight.yang.gen.v1.http.fd.io.hc2vpp.yang.vpp.classifier.rev170327.classify.session.attributes.next_node.StandardBuilder;
import org.opendaylight.yang.gen.v1.http.fd.io.hc2vpp.yang.vpp.classifier.rev170327.classify.table.base.attributes.ClassifySession;
import org.opendaylight.yang.gen.v1.http.fd.io.hc2vpp.yang.vpp.classifier.rev170327.classify.table.base.attributes.ClassifySessionBuilder;
import org.opendaylight.yang.gen.v1.http.fd.io.hc2vpp.yang.vpp.classifier.rev170327.classify.table.base.attributes.ClassifySessionKey;
import org.opendaylight.yang.gen.v1.http.fd.io.hc2vpp.yang.vpp.classifier.rev170327.vpp.classifier.ClassifyTable;
import org.opendaylight.yang.gen.v1.http.fd.io.hc2vpp.yang.vpp.classifier.rev170327.vpp.classifier.ClassifyTableKey;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.yang.types.rev130715.HexString;
import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;

public class ClassifySessionWriterTest extends WriterCustomizerTest {

    private static final int TABLE_INDEX = 123;
    private static final String TABLE_NAME = "table123";
    private static final int SESSION_INDEX = 456;
    @Mock
    private VppClassifierContextManager classfierContext;
    private ClassifySessionWriter customizer;

    private static ClassifySession generateClassifySession(final long opaqueIndex, final String match) {
        final ClassifySessionBuilder builder = new ClassifySessionBuilder();
        builder.setNextNode(
            new StandardBuilder()
                .setOpaqueIndex(new OpaqueIndex(opaqueIndex))
                .setHitNext(new VppNode(PacketHandlingAction.Deny))
                .build());
        builder.setAdvance(123);
        builder.setMatch(new HexString(match));
        return builder.build();
    }

    static InstanceIdentifier<ClassifySession> getClassifySessionId(final String tableName,
                                                                            final String match) {
        return InstanceIdentifier.create(VppClassifier.class)
                .child(ClassifyTable.class, new ClassifyTableKey(tableName))
                .child(ClassifySession.class, new ClassifySessionKey(new HexString(match)));
    }

    private static ClassifyAddDelSession generateClassifyAddDelSession(final byte isAdd, final int tableIndex,
                                                                       final int sessionIndex) {
        return generateClassifyAddDelSession(isAdd, tableIndex, sessionIndex,
            new byte[] {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, (byte) 0x01, (byte) 0x02, (byte) 0x03, (byte) 0x04,
                (byte) 0x05, (byte) 0x06, 0x00, 0x00, 0x00, 0x00});
    }

    private static ClassifyAddDelSession generateClassifyAddDelSession(final byte isAdd, final int tableIndex,
                                                                       final int sessionIndex, final byte[] match) {
        final ClassifyAddDelSession request = new ClassifyAddDelSession();
        request.isAdd = isAdd;
        request.tableIndex = tableIndex;
        request.opaqueIndex = sessionIndex;
        request.hitNextIndex = 0;
        request.advance = 123;
        request.match = match;
        request.matchLen = request.match.length;
        return request;
    }

    @Override
    public void setUpTest() throws Exception {
        customizer = new ClassifySessionWriter(api, classfierContext, new NamingContext("policer-", "policer-context-"));

        when(classfierContext.containsTable(TABLE_NAME, mappingContext)).thenReturn(true);
        when(classfierContext.getTableIndex(TABLE_NAME, mappingContext)).thenReturn(TABLE_INDEX);

        final ClassifyTable table = mock(ClassifyTable.class);
        when(table.getMask()).thenReturn(new HexString("00:00:00:00:00:00:ff:FF:ff:ff:ff:FF:00:00:00:00"));
        when(table.getSkipNVectors()).thenReturn(0L);
        when(table.getClassifierNode()).thenReturn(new VppNodeName("ip4-classifier"));
        when(writeContext.readAfter(ArgumentMatchers.any())).thenReturn(Optional.of(table));
        when(writeContext.readBefore(ArgumentMatchers.any())).thenReturn(Optional.of(table));
    }

    private void whenClassifyAddDelSessionThenSuccess() {
        doReturn(future(new ClassifyAddDelSessionReply())).when(api)
                .classifyAddDelSession(ArgumentMatchers.any(ClassifyAddDelSession.class));
    }

    private void whenClassifyAddDelSessionThenFailure() {
        doReturn(failedFuture()).when(api).classifyAddDelSession(ArgumentMatchers.any(ClassifyAddDelSession.class));
    }

    @Test
    public void testCreate() throws Exception {
        final String match = "00:00:00:00:00:00:01:02:03:04:05:06:00:00:00:00";
        final ClassifySession classifySession = generateClassifySession(SESSION_INDEX, match);
        final InstanceIdentifier<ClassifySession> id = getClassifySessionId(TABLE_NAME, match);

        whenClassifyAddDelSessionThenSuccess();

        customizer.writeCurrentAttributes(id, classifySession, writeContext);

        verify(api).classifyAddDelSession(generateClassifyAddDelSession((byte) 1, TABLE_INDEX, SESSION_INDEX));
    }

    @Test
    public void testCreateFailed() throws Exception {
        final String match = "00:00:00:00:00:00:01:02:03:04:05:06:00:00:00:00";
        final ClassifySession classifySession = generateClassifySession(SESSION_INDEX, match);
        final InstanceIdentifier<ClassifySession> id = getClassifySessionId(TABLE_NAME, match);

        whenClassifyAddDelSessionThenFailure();

        try {
            customizer.writeCurrentAttributes(id, classifySession, writeContext);
        } catch (WriteFailedException e) {
            assertTrue(e.getCause() instanceof VppBaseCallException);
            verify(api).classifyAddDelSession(generateClassifyAddDelSession((byte) 1, TABLE_INDEX, SESSION_INDEX));
            return;
        }
        fail("WriteFailedException.CreateFailedException was expected");
    }

    @Test(expected = UnsupportedOperationException.class)
    public void testUpdate() throws Exception {
        customizer.updateCurrentAttributes(null, null, null, writeContext);
    }

    @Test
    public void testDelete() throws Exception {
        final String match = "00:00:00:00:00:00:01:02:03:04:05:06:00:00:00:00";
        final ClassifySession classifySession = generateClassifySession(SESSION_INDEX, match);
        final InstanceIdentifier<ClassifySession> id = getClassifySessionId(TABLE_NAME, match);

        whenClassifyAddDelSessionThenSuccess();

        customizer.deleteCurrentAttributes(id, classifySession, writeContext);

        verify(api).classifyAddDelSession(generateClassifyAddDelSession((byte) 0, TABLE_INDEX, SESSION_INDEX));
    }

    @Test
    public void testDeleteFailed() throws Exception {
        final String match = "00:00:00:00:00:00:01:02:03:04:05:06:00:00:00:00";
        final ClassifySession classifySession = generateClassifySession(SESSION_INDEX, match);
        final InstanceIdentifier<ClassifySession> id = getClassifySessionId(TABLE_NAME, match);

        whenClassifyAddDelSessionThenFailure();

        try {
            customizer.deleteCurrentAttributes(id, classifySession, writeContext);
        } catch (WriteFailedException e) {
            assertTrue(e.getCause() instanceof VppBaseCallException);
            verify(api).classifyAddDelSession(generateClassifyAddDelSession((byte) 0, TABLE_INDEX, SESSION_INDEX));
            return;
        }
        fail("WriteFailedException.DeleteFailedException was expected");

        customizer.deleteCurrentAttributes(id, classifySession, writeContext);
    }

    @Test(expected = IllegalStateException.class)
    public void testDeleteMisssingTable() throws WriteFailedException {
        when(writeContext.readAfter(ArgumentMatchers.any())).thenReturn(Optional.empty());
        final String match = "00:00:00:00:00:00:01:02:03:04:05:06:00:00:00:00";
        final ClassifySession classifySession = generateClassifySession(SESSION_INDEX, match);
        final InstanceIdentifier<ClassifySession> id = getClassifySessionId(TABLE_NAME, match);
        customizer.writeCurrentAttributes(id, classifySession, writeContext);
    }

    @Test
    public void testCreateSkipOneVector() throws WriteFailedException {
        final ClassifyTable table = mock(ClassifyTable.class);
        when(table.getMask()).thenReturn(new HexString("00:00:00:00:00:00:ff:FF:ff:ff:ff:FF:00:00:00:00"));
        when(table.getSkipNVectors()).thenReturn(1L);
        when(writeContext.readAfter(ArgumentMatchers.any())).thenReturn(Optional.of(table));
        whenClassifyAddDelSessionThenSuccess();

        final String match = "01:02:03:04:05:06:07:08:09:0a:0b:0c:0d:0e:0f:10";
        final ClassifySession classifySession = generateClassifySession(SESSION_INDEX, match);
        final InstanceIdentifier<ClassifySession> id = getClassifySessionId(TABLE_NAME, match);
        customizer.writeCurrentAttributes(id, classifySession, writeContext);
        verify(api).classifyAddDelSession(generateClassifyAddDelSession((byte) 1, TABLE_INDEX, SESSION_INDEX,
            new byte[] {
                1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16,
                0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}));
    }
}