/*
 * Copyright (c) 2016 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.v3po.translate.v3po.vppclassifier;

import static io.fd.honeycomb.v3po.translate.v3po.test.ContextTestUtils.getMapping;
import static io.fd.honeycomb.v3po.translate.v3po.test.ContextTestUtils.getMappingIid;
import static junit.framework.TestCase.assertTrue;
import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.fail;
import static org.mockito.Matchers.any;
import static org.mockito.Matchers.eq;
import static org.mockito.Mockito.doReturn;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.verifyZeroInteractions;
import static org.mockito.MockitoAnnotations.initMocks;

import com.google.common.base.Optional;
import io.fd.honeycomb.v3po.translate.MappingContext;
import io.fd.honeycomb.v3po.translate.v3po.test.TestHelperUtils;
import io.fd.honeycomb.v3po.translate.v3po.util.NamingContext;
import io.fd.honeycomb.v3po.translate.write.WriteContext;
import io.fd.honeycomb.v3po.translate.write.WriteFailedException;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;
import org.junit.Before;
import org.junit.Test;
import org.mockito.ArgumentCaptor;
import org.mockito.Mock;
import org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.naming.context.rev160513.contexts.naming.context.mappings.Mapping;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.yang.types.rev130715.HexString;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.vpp.classifier.rev150603.PacketHandlingAction;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.vpp.classifier.rev150603.VppClassifier;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.vpp.classifier.rev150603.VppNode;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.vpp.classifier.rev150603.vpp.classifier.ClassifyTable;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.vpp.classifier.rev150603.vpp.classifier.ClassifyTableBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.vpp.classifier.rev150603.vpp.classifier.ClassifyTableKey;
import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
import org.openvpp.jvpp.VppBaseCallException;
import org.openvpp.jvpp.dto.ClassifyAddDelTable;
import org.openvpp.jvpp.dto.ClassifyAddDelTableReply;
import org.openvpp.jvpp.dto.L2InterfaceVlanTagRewriteReply;
import org.openvpp.jvpp.future.FutureJVpp;

public class ClassifyTableWriterTest {

    private static final int TABLE_INDEX = 123;
    private static final String TABLE_NAME = "table123";

    @Mock
    private FutureJVpp api;
    @Mock
    private WriteContext writeContext;
    @Mock
    private MappingContext mappingContext;

    private NamingContext classifyTableContext;
    private ClassifyTableWriter customizer;

    @Before
    public void setUp() throws Exception {
        initMocks(this);
        classifyTableContext = new NamingContext("generatedClassifyTableName", "test-instance");
        doReturn(mappingContext).when(writeContext).getMappingContext();
        customizer = new ClassifyTableWriter(api, classifyTableContext);
    }

    private static ClassifyTable generateClassifyTable(final String name) {
        final ClassifyTableBuilder builder = new ClassifyTableBuilder();
        builder.setName(name);
        builder.setKey(new ClassifyTableKey(name));
        builder.setSkipNVectors(0L);
        builder.setNbuckets(2L);
        builder.setMemorySize(2L << 20);
        builder.setMissNextIndex(new VppNode(PacketHandlingAction.Permit));
        builder.setMask(new HexString("00:00:00:00:00:00:01:02:03:04:05:06:00:00:00:00"));
        return builder.build();
    }

    private static InstanceIdentifier<ClassifyTable> getClassifyTableId(final String name) {
        return InstanceIdentifier.create(VppClassifier.class)
            .child(ClassifyTable.class, new ClassifyTableKey(name));
    }

    private void whenClassifyAddDelTableThenSuccess() throws ExecutionException, InterruptedException {
        final CompletableFuture<ClassifyAddDelTableReply> replyFuture = new CompletableFuture<>();
        final ClassifyAddDelTableReply reply = new ClassifyAddDelTableReply();
        reply.newTableIndex = TABLE_INDEX;
        replyFuture.complete(reply);
        doReturn(replyFuture).when(api).classifyAddDelTable(any(ClassifyAddDelTable.class));
    }

    private void whenClassifyAddDelTableThenFailure() throws ExecutionException, InterruptedException {
        doReturn(TestHelperUtils.<L2InterfaceVlanTagRewriteReply>createFutureException()).when(api)
            .classifyAddDelTable(any(ClassifyAddDelTable.class));
    }

    private void verifyClassifyAddDelTableAddWasInvoked(final ClassifyAddDelTable expected) {
        ArgumentCaptor<ClassifyAddDelTable> argumentCaptor = ArgumentCaptor.forClass(ClassifyAddDelTable.class);
        verify(api).classifyAddDelTable(argumentCaptor.capture());
        final ClassifyAddDelTable actual = argumentCaptor.getValue();
        assertEquals(expected.isAdd, actual.isAdd);
        assertEquals(~0, actual.tableIndex);
        assertEquals(expected.nbuckets, actual.nbuckets);
        assertEquals(expected.memorySize, actual.memorySize);
        assertEquals(expected.skipNVectors, actual.skipNVectors);
        assertEquals(expected.matchNVectors, actual.matchNVectors);
        assertEquals(expected.nextTableIndex, actual.nextTableIndex);
        assertEquals(expected.missNextIndex, actual.missNextIndex);
        assertArrayEquals(expected.mask, actual.mask);
    }

    private void verifyClassifyAddDelTableDeleteWasInvoked(final ClassifyAddDelTable expected) {
        ArgumentCaptor<ClassifyAddDelTable> argumentCaptor = ArgumentCaptor.forClass(ClassifyAddDelTable.class);
        verify(api).classifyAddDelTable(argumentCaptor.capture());
        final ClassifyAddDelTable actual = argumentCaptor.getValue();
        assertEquals(expected.isAdd, actual.isAdd);
        assertEquals(expected.tableIndex, actual.tableIndex);
    }

    private static ClassifyAddDelTable generateClassifyAddDelTable(final byte isAdd, final int tableIndex) {
        final ClassifyAddDelTable request = new ClassifyAddDelTable();
        request.isAdd = isAdd;
        request.tableIndex = tableIndex;
        request.nbuckets = 2;
        request.memorySize = 2 << 20;
        request.skipNVectors = 0;
        request.matchNVectors = 1;
        request.nextTableIndex = ~0;
        request.missNextIndex = ~0;
        request.mask =
            new byte[] {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, (byte) 0x01, (byte) 0x02, (byte) 0x03, (byte) 0x04,
                (byte) 0x05, (byte) 0x06, 0x00, 0x00, 0x00, 0x00};
        return request;
    }

    @Test
    public void testCreate() throws Exception {
        final ClassifyTable classifyTable = generateClassifyTable(TABLE_NAME);
        final InstanceIdentifier<ClassifyTable> id = getClassifyTableId(TABLE_NAME);

        whenClassifyAddDelTableThenSuccess();

        customizer.writeCurrentAttributes(id, classifyTable, writeContext);

        verifyClassifyAddDelTableAddWasInvoked(generateClassifyAddDelTable((byte) 1, TABLE_INDEX));
        verify(mappingContext)
            .put(eq(getMappingIid(TABLE_NAME, "test-instance")), eq(getMapping(TABLE_NAME, TABLE_INDEX).get()));
    }

    @Test
    public void testCreateFailed() throws Exception {
        final ClassifyTable classifyTable = generateClassifyTable(TABLE_NAME);
        final InstanceIdentifier<ClassifyTable> id = getClassifyTableId(TABLE_NAME);

        whenClassifyAddDelTableThenFailure();

        try {
            customizer.writeCurrentAttributes(id, classifyTable, writeContext);
        } catch (WriteFailedException.CreateFailedException e) {
            assertTrue(e.getCause() instanceof VppBaseCallException);
            verifyClassifyAddDelTableAddWasInvoked(generateClassifyAddDelTable((byte) 1, TABLE_INDEX));
            verify(mappingContext, times(0)).put(
                eq(getMappingIid(TABLE_NAME, "test-instance")),
                eq(getMapping(TABLE_NAME, TABLE_INDEX).get()));
            return;
        }
        fail("WriteFailedException.CreateFailedException was expected");
    }

    @Test
    public void testDelete() throws Exception {
        final ClassifyTable classifyTable = generateClassifyTable(TABLE_NAME);
        final InstanceIdentifier<ClassifyTable> id = getClassifyTableId(TABLE_NAME);

        final Optional<Mapping> ifcMapping = getMapping(TABLE_NAME, TABLE_INDEX);
        doReturn(ifcMapping).when(mappingContext).read(any());

        whenClassifyAddDelTableThenSuccess();

        customizer.deleteCurrentAttributes(id, classifyTable, writeContext);

        verifyClassifyAddDelTableDeleteWasInvoked(generateClassifyAddDelTable((byte) 0, TABLE_INDEX));
    }

    @Test
    public void testDeleteFailed() throws Exception {
        final ClassifyTable classifyTable = generateClassifyTable(TABLE_NAME);
        final InstanceIdentifier<ClassifyTable> id = getClassifyTableId(TABLE_NAME);

        final Optional<Mapping> ifcMapping = getMapping(TABLE_NAME, TABLE_INDEX);
        doReturn(ifcMapping).when(mappingContext).read(any());

        whenClassifyAddDelTableThenFailure();

        try {
            customizer.deleteCurrentAttributes(id, classifyTable, writeContext);
        } catch (WriteFailedException.DeleteFailedException e) {
            assertTrue(e.getCause() instanceof VppBaseCallException);
            verifyClassifyAddDelTableDeleteWasInvoked(generateClassifyAddDelTable((byte) 0, TABLE_INDEX));
            return;
        }
        fail("WriteFailedException.DeleteFailedException was expected");

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

    @Test
    public void testUpdate() throws Exception {
        final ClassifyTable classifyTableBefore = generateClassifyTable(TABLE_NAME);
        final InstanceIdentifier<ClassifyTable> id = getClassifyTableId(TABLE_NAME);
        customizer.updateCurrentAttributes(id, classifyTableBefore, new ClassifyTableBuilder().build(), writeContext);

        verifyZeroInteractions(api);
    }
}