/*
 * SPDX-License-Identifier: Apache-2.0
 *
 * The OpenSearch Contributors require contributions made to
 * this file be licensed under the Apache-2.0 license or a
 * compatible open source license.
 */

/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch licenses this file to you 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.
 */
/*
 * Modifications Copyright OpenSearch Contributors. See
 * GitHub history for details.
 */

package org.opensearch.cluster.health;

import org.opensearch.core.common.io.stream.Writeable;
import org.opensearch.core.xcontent.XContentParser;
import org.opensearch.test.AbstractSerializingTestCase;

import java.io.IOException;
import java.util.Arrays;
import java.util.function.Predicate;
import java.util.stream.Collectors;

public class ClusterShardHealthTests extends AbstractSerializingTestCase<ClusterShardHealth> {

    @Override
    protected ClusterShardHealth doParseInstance(XContentParser parser) throws IOException {
        return ClusterShardHealth.fromXContent(parser);
    }

    @Override
    protected ClusterShardHealth createTestInstance() {
        return randomShardHealth(randomInt(1000));
    }

    static ClusterShardHealth randomShardHealth(int id) {
        return new ClusterShardHealth(
            id,
            randomFrom(ClusterHealthStatus.values()),
            randomInt(1000),
            randomInt(1000),
            randomInt(1000),
            randomInt(1000),
            randomBoolean()
        );
    }

    @Override
    protected Writeable.Reader<ClusterShardHealth> instanceReader() {
        return ClusterShardHealth::new;
    }

    @Override
    protected boolean supportsUnknownFields() {
        return true;
    }

    @Override
    protected Predicate<String> getRandomFieldsExcludeFilter() {
        // don't inject random fields at the root, which contains arbitrary shard ids
        return ""::equals;
    }

    @Override
    protected ClusterShardHealth mutateInstance(final ClusterShardHealth instance) {
        String mutate = randomFrom(
            "shardId",
            "status",
            "activeShards",
            "relocatingShards",
            "initializingShards",
            "unassignedShards",
            "primaryActive"
        );
        switch (mutate) {
            case "shardId":
                return new ClusterShardHealth(
                    instance.getShardId() + between(1, 10),
                    instance.getStatus(),
                    instance.getActiveShards(),
                    instance.getRelocatingShards(),
                    instance.getInitializingShards(),
                    instance.getUnassignedShards(),
                    instance.isPrimaryActive()
                );
            case "status":
                ClusterHealthStatus status = randomFrom(
                    Arrays.stream(ClusterHealthStatus.values())
                        .filter(value -> !value.equals(instance.getStatus()))
                        .collect(Collectors.toList())
                );
                return new ClusterShardHealth(
                    instance.getShardId(),
                    status,
                    instance.getActiveShards(),
                    instance.getRelocatingShards(),
                    instance.getInitializingShards(),
                    instance.getUnassignedShards(),
                    instance.isPrimaryActive()
                );
            case "activeShards":
                return new ClusterShardHealth(
                    instance.getShardId(),
                    instance.getStatus(),
                    instance.getActiveShards() + between(1, 10),
                    instance.getRelocatingShards(),
                    instance.getInitializingShards(),
                    instance.getUnassignedShards(),
                    instance.isPrimaryActive()
                );
            case "relocatingShards":
                return new ClusterShardHealth(
                    instance.getShardId(),
                    instance.getStatus(),
                    instance.getActiveShards(),
                    instance.getRelocatingShards() + between(1, 10),
                    instance.getInitializingShards(),
                    instance.getUnassignedShards(),
                    instance.isPrimaryActive()
                );
            case "initializingShards":
                return new ClusterShardHealth(
                    instance.getShardId(),
                    instance.getStatus(),
                    instance.getActiveShards(),
                    instance.getRelocatingShards(),
                    instance.getInitializingShards() + between(1, 10),
                    instance.getUnassignedShards(),
                    instance.isPrimaryActive()
                );
            case "unassignedShards":
                return new ClusterShardHealth(
                    instance.getShardId(),
                    instance.getStatus(),
                    instance.getActiveShards(),
                    instance.getRelocatingShards(),
                    instance.getInitializingShards(),
                    instance.getUnassignedShards() + between(1, 10),
                    instance.isPrimaryActive()
                );
            case "primaryActive":
                return new ClusterShardHealth(
                    instance.getShardId(),
                    instance.getStatus(),
                    instance.getActiveShards(),
                    instance.getRelocatingShards(),
                    instance.getInitializingShards(),
                    instance.getUnassignedShards(),
                    instance.isPrimaryActive() == false
                );
            default:
                throw new UnsupportedOperationException();
        }
    }
}