/*
 * Copyright (c) 2016 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.openflowplugin.impl.util;

import com.google.common.base.Function;
import com.google.common.collect.Lists;
import java.util.Collections;
import java.util.List;
import org.apache.commons.lang3.tuple.Pair;
import org.junit.Assert;
import org.junit.Test;
import org.opendaylight.yang.gen.v1.urn.opendaylight.group.types.rev131018.GroupId;
import org.opendaylight.yang.gen.v1.urn.opendaylight.group.types.rev131018.GroupRef;
import org.opendaylight.yang.gen.v1.urn.opendaylight.group.types.rev131018.groups.Group;
import org.opendaylight.yang.gen.v1.urn.opendaylight.group.types.rev131018.groups.GroupBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.groups.service.rev160315.AddGroupsBatchOutput;
import org.opendaylight.yang.gen.v1.urn.opendaylight.groups.service.rev160315.AddGroupsBatchOutputBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.groups.service.rev160315.BatchGroupOutputListGrouping;
import org.opendaylight.yang.gen.v1.urn.opendaylight.groups.service.rev160315.batch.group.output.list.grouping.BatchFailedGroupsOutput;
import org.opendaylight.yang.gen.v1.urn.opendaylight.groups.service.rev160315.batch.group.output.list.grouping.BatchFailedGroupsOutputBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.NodeId;
import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.Nodes;
import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.nodes.Node;
import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.nodes.NodeKey;
import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
import org.opendaylight.yangtools.yang.common.RpcError;
import org.opendaylight.yangtools.yang.common.RpcResult;
import org.opendaylight.yangtools.yang.common.RpcResultBuilder;

/**
 * Test for {@link GroupUtil}.
 */
public class GroupUtilTest {

    public static final NodeId DUMMY_NODE_ID = new NodeId("dummyNodeId");
    private static final GroupId DUMMY_GROUP_ID = new GroupId(42L);
    private static final GroupId DUMMY_GROUP_ID_2 = new GroupId(43L);

    @Test
    public void testBuildGroupPath() throws Exception {
        final InstanceIdentifier<Node> nodePath = InstanceIdentifier
                .create(Nodes.class)
                .child(Node.class, new NodeKey(DUMMY_NODE_ID));

        final GroupRef groupRef = GroupUtil.buildGroupPath(nodePath, DUMMY_GROUP_ID);
        final InstanceIdentifier<?> groupRefValue = groupRef.getValue();
        Assert.assertEquals(DUMMY_NODE_ID, groupRefValue.firstKeyOf(Node.class).getId());
        Assert.assertEquals(DUMMY_GROUP_ID, groupRefValue.firstKeyOf(Group.class).getGroupId());
    }

    @Test
    public void testCreateCumulatingFunction() throws Exception {
        final Function<List<RpcResult<String>>, RpcResult<List<BatchFailedGroupsOutput>>> function =
                GroupUtil.createCumulatingFunction(Lists.newArrayList(createBatchGroup(DUMMY_GROUP_ID),
                        createBatchGroup(DUMMY_GROUP_ID_2)));

        final RpcResult<List<BatchFailedGroupsOutput>> summary = function.apply(Lists.newArrayList(
                RpcResultBuilder.success("a").build(),
                RpcResultBuilder.<String>failed()
                        .withError(RpcError.ErrorType.APPLICATION, "action-failed reason")
                        .build()));

        Assert.assertFalse(summary.isSuccessful());
        Assert.assertEquals(1, summary.getResult().size());
        Assert.assertEquals(1, summary.getErrors().size());
        Assert.assertEquals(DUMMY_GROUP_ID_2, summary.getResult().get(0).getGroupId());
        Assert.assertEquals(1, summary.getResult().get(0).getBatchOrder().intValue());
    }

    protected Group createBatchGroup(final GroupId groupId) {
        return new GroupBuilder().setGroupId(groupId).build();
    }

    @Test
    public void testGROUP_ADD_TRANSFORM__failure() throws Exception {
        final RpcResult<List<BatchFailedGroupsOutput>> input = createBatchOutcomeWithError();
        checkBatchErrorOutcomeTransformation(GroupUtil.GROUP_ADD_TRANSFORM.apply(input));
    }

    @Test
    public void testGROUP_ADD_TRANSFORM__success() throws Exception {
        final RpcResult<List<BatchFailedGroupsOutput>> input = createEmptyBatchOutcome();
        checkBatchSuccessOutcomeTransformation(GroupUtil.GROUP_ADD_TRANSFORM.apply(input));
    }

    @Test
    public void testGROUP_REMOVE_TRANSFORM__failure() throws Exception {
        final RpcResult<List<BatchFailedGroupsOutput>> input = createBatchOutcomeWithError();
        checkBatchErrorOutcomeTransformation(GroupUtil.GROUP_REMOVE_TRANSFORM.apply(input));
    }

    @Test
    public void testFLOW_REMOVE_TRANSFORM__success() throws Exception {
        final RpcResult<List<BatchFailedGroupsOutput>> input = createEmptyBatchOutcome();
        checkBatchSuccessOutcomeTransformation(GroupUtil.GROUP_REMOVE_TRANSFORM.apply(input));
    }

    @Test
    public void testFLOW_UPDATE_TRANSFORM__failure() throws Exception {
        final RpcResult<List<BatchFailedGroupsOutput>> input = createBatchOutcomeWithError();
        checkBatchErrorOutcomeTransformation(GroupUtil.GROUP_UPDATE_TRANSFORM.apply(input));
    }

    @Test
    public void testFLOW_UPDATE_TRANSFORM__success() throws Exception {
        final RpcResult<List<BatchFailedGroupsOutput>> input = createEmptyBatchOutcome();
        checkBatchSuccessOutcomeTransformation(GroupUtil.GROUP_UPDATE_TRANSFORM.apply(input));
    }

    private <T extends BatchGroupOutputListGrouping> void checkBatchSuccessOutcomeTransformation(final RpcResult<T> output) {
        Assert.assertTrue(output.isSuccessful());
        Assert.assertEquals(0, output.getResult().getBatchFailedGroupsOutput().size());
        Assert.assertEquals(0, output.getErrors().size());
    }

    private RpcResult<List<BatchFailedGroupsOutput>> createEmptyBatchOutcome() {
        return RpcResultBuilder
                .<List<BatchFailedGroupsOutput>>success(Collections.<BatchFailedGroupsOutput>emptyList())
                .build();
    }

    private RpcResult<List<BatchFailedGroupsOutput>> createBatchOutcomeWithError() {
        return RpcResultBuilder.<List<BatchFailedGroupsOutput>>failed()
                .withError(RpcError.ErrorType.APPLICATION, "ut-flowAddFail")
                .withResult(Collections.singletonList(new BatchFailedGroupsOutputBuilder()
                        .setGroupId(DUMMY_GROUP_ID)
                        .build()))
                .build();
    }

    private <T extends BatchGroupOutputListGrouping> void checkBatchErrorOutcomeTransformation(final RpcResult<T> output) {
        Assert.assertFalse(output.isSuccessful());
        Assert.assertEquals(1, output.getResult().getBatchFailedGroupsOutput().size());
        Assert.assertEquals(DUMMY_GROUP_ID, output.getResult().getBatchFailedGroupsOutput().get(0).getGroupId());

        Assert.assertEquals(1, output.getErrors().size());
    }

    @Test
    public void testCreateComposingFunction_success_success() throws Exception {
        final Function<Pair<RpcResult<AddGroupsBatchOutput>, RpcResult<Void>>, RpcResult<AddGroupsBatchOutput>> compositeFunction =
                GroupUtil.createComposingFunction();

        final RpcResult<AddGroupsBatchOutput> addGroupBatchOutput = createAddGroupsBatchSuccessOutput();
        final RpcResult<Void> barrierOutput = RpcResultBuilder.<Void>success().build();
        final Pair<RpcResult<AddGroupsBatchOutput>, RpcResult<Void>> input = Pair.of(addGroupBatchOutput, barrierOutput);
        final RpcResult<AddGroupsBatchOutput> composite = compositeFunction.apply(input);

        Assert.assertTrue(composite.isSuccessful());
        Assert.assertEquals(0, composite.getErrors().size());
        Assert.assertEquals(0, composite.getResult().getBatchFailedGroupsOutput().size());
    }

    @Test
    public void testCreateComposingFunction_failure_success() throws Exception {
        final Function<Pair<RpcResult<AddGroupsBatchOutput>, RpcResult<Void>>, RpcResult<AddGroupsBatchOutput>> compositeFunction =
                GroupUtil.createComposingFunction();

        final RpcResult<AddGroupsBatchOutput> addGroupBatchOutput = createAddGroupsBatchFailureOutcome();
        final RpcResult<Void> barrierOutput = RpcResultBuilder.<Void>success().build();
        final Pair<RpcResult<AddGroupsBatchOutput>, RpcResult<Void>> input = Pair.of(addGroupBatchOutput, barrierOutput);
        final RpcResult<AddGroupsBatchOutput> composite = compositeFunction.apply(input);

        Assert.assertFalse(composite.isSuccessful());
        Assert.assertEquals(1, composite.getErrors().size());
        Assert.assertEquals(1, composite.getResult().getBatchFailedGroupsOutput().size());
    }

    @Test
    public void testCreateComposingFunction_success_failure() throws Exception {
        final Function<Pair<RpcResult<AddGroupsBatchOutput>, RpcResult<Void>>, RpcResult<AddGroupsBatchOutput>> compositeFunction =
                GroupUtil.createComposingFunction();

        final RpcResult<AddGroupsBatchOutput> addGroupBatchOutput = createAddGroupsBatchSuccessOutput();
        final RpcResult<Void> barrierOutput = createBarrierFailureOutcome();
        final Pair<RpcResult<AddGroupsBatchOutput>, RpcResult<Void>> input = Pair.of(addGroupBatchOutput, barrierOutput);
        final RpcResult<AddGroupsBatchOutput> composite = compositeFunction.apply(input);

        Assert.assertFalse(composite.isSuccessful());
        Assert.assertEquals(1, composite.getErrors().size());
        Assert.assertEquals(0, composite.getResult().getBatchFailedGroupsOutput().size());
    }

    @Test
    public void testCreateComposingFunction_failure_failure() throws Exception {
        final Function<Pair<RpcResult<AddGroupsBatchOutput>, RpcResult<Void>>, RpcResult<AddGroupsBatchOutput>> compositeFunction =
                GroupUtil.createComposingFunction();

        final RpcResult<AddGroupsBatchOutput> addGroupBatchOutput = createAddGroupsBatchFailureOutcome();
        final RpcResult<Void> barrierOutput = createBarrierFailureOutcome();
        final Pair<RpcResult<AddGroupsBatchOutput>, RpcResult<Void>> input = Pair.of(addGroupBatchOutput, barrierOutput);
        final RpcResult<AddGroupsBatchOutput> composite = compositeFunction.apply(input);

        Assert.assertFalse(composite.isSuccessful());
        Assert.assertEquals(2, composite.getErrors().size());
        Assert.assertEquals(1, composite.getResult().getBatchFailedGroupsOutput().size());
    }

    private RpcResult<Void> createBarrierFailureOutcome() {
        return RpcResultBuilder.<Void>failed()
                .withError(RpcError.ErrorType.APPLICATION, "ut-barrier-error")
                .build();
    }

    private RpcResult<AddGroupsBatchOutput> createAddGroupsBatchSuccessOutput() {
        return RpcResultBuilder
                .success(new AddGroupsBatchOutputBuilder()
                        .setBatchFailedGroupsOutput(Collections.<BatchFailedGroupsOutput>emptyList())
                        .build())
                .build();
    }

    private RpcResult<AddGroupsBatchOutput> createAddGroupsBatchFailureOutcome() {
        final RpcResult<List<BatchFailedGroupsOutput>> batchOutcomeWithError = createBatchOutcomeWithError();
        return RpcResultBuilder.<AddGroupsBatchOutput>failed()
                .withResult(new AddGroupsBatchOutputBuilder()
                        .setBatchFailedGroupsOutput(batchOutcomeWithError.getResult())
                        .build())
                .withRpcErrors(batchOutcomeWithError.getErrors())
                .build();
    }
}