/*
 * 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
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/*
 * Modifications Copyright OpenSearch Contributors. See
 * GitHub history for details.
 */

package org.opensearch.index.seqno;

import org.opensearch.action.ActionListener;
import org.opensearch.action.admin.indices.stats.IndicesStatsResponse;
import org.opensearch.action.support.replication.ReplicationResponse;
import org.opensearch.common.settings.Settings;
import org.opensearch.index.IndexSettings;
import org.opensearch.index.shard.IndexShard;
import org.opensearch.core.index.shard.ShardId;
import org.opensearch.indices.IndicesService;
import org.opensearch.test.OpenSearchSingleNodeTestCase;

import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.CountDownLatch;

import static org.hamcrest.Matchers.arrayWithSize;
import static org.hamcrest.Matchers.equalTo;

public class RetentionLeaseStatsTests extends OpenSearchSingleNodeTestCase {

    public void testRetentionLeaseStats() throws InterruptedException {
        final Settings settings = Settings.builder()
            .put("index.number_of_shards", 1)
            .put("index.number_of_replicas", 0)
            .put(IndexSettings.INDEX_SOFT_DELETES_SETTING.getKey(), true)
            .build();
        createIndex("index", settings);
        ensureGreen("index");
        final IndexShard primary = node().injector()
            .getInstance(IndicesService.class)
            .getShardOrNull(new ShardId(resolveIndex("index"), 0));
        final int length = randomIntBetween(0, 8);
        final Map<String, RetentionLease> currentRetentionLeases = new HashMap<>();
        for (int i = 0; i < length; i++) {
            final String id = randomValueOtherThanMany(currentRetentionLeases.keySet()::contains, () -> randomAlphaOfLength(8));
            final long retainingSequenceNumber = randomLongBetween(0, Long.MAX_VALUE);
            final String source = randomAlphaOfLength(8);
            final CountDownLatch latch = new CountDownLatch(1);
            final ActionListener<ReplicationResponse> listener = ActionListener.wrap(r -> latch.countDown(), e -> fail(e.toString()));
            currentRetentionLeases.put(id, primary.addRetentionLease(id, retainingSequenceNumber, source, listener));
            latch.await();
        }

        final IndicesStatsResponse indicesStats = client().admin().indices().prepareStats("index").execute().actionGet();
        assertThat(indicesStats.getShards(), arrayWithSize(1));
        final RetentionLeaseStats retentionLeaseStats = indicesStats.getShards()[0].getRetentionLeaseStats();
        assertThat(
            RetentionLeaseUtils.toMapExcludingPeerRecoveryRetentionLeases(retentionLeaseStats.retentionLeases()),
            equalTo(currentRetentionLeases)
        );
    }

}