/*
 * 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.gradle.testclusters;

import org.gradle.api.logging.Logger;
import org.gradle.api.logging.Logging;
import org.gradle.api.services.BuildService;
import org.gradle.api.services.BuildServiceParameters;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

public abstract class TestClustersRegistry implements BuildService<BuildServiceParameters.None> {
    private static final Logger logger = Logging.getLogger(TestClustersRegistry.class);
    private static final String TESTCLUSTERS_INSPECT_FAILURE = "testclusters.inspect.failure";
    private final Boolean allowClusterToSurvive = Boolean.valueOf(System.getProperty(TESTCLUSTERS_INSPECT_FAILURE, "false"));
    private final Map<OpenSearchCluster, Integer> claimsInventory = new HashMap<>();
    private final Set<OpenSearchCluster> runningClusters = new HashSet<>();

    public void claimCluster(OpenSearchCluster cluster) {
        cluster.freeze();
        claimsInventory.put(cluster, claimsInventory.getOrDefault(cluster, 0) + 1);
    }

    public void maybeStartCluster(OpenSearchCluster cluster) {
        if (runningClusters.contains(cluster)) {
            return;
        }
        runningClusters.add(cluster);
        cluster.start();
    }

    public void stopCluster(OpenSearchCluster cluster, boolean taskFailed) {
        if (taskFailed) {
            // If the task fails, and other tasks use this cluster, the other task will likely never be
            // executed at all, so we will never be called again to un-claim and terminate it.
            if (allowClusterToSurvive) {
                logger.info("Not stopping clusters, disabled by property");
                // task failed or this is the last one to stop
                for (int i = 1;; i += i) {
                    logger.lifecycle(
                        "No more test clusters left to run, going to sleep because {} was set," + " interrupt (^C) to stop clusters.",
                        TESTCLUSTERS_INSPECT_FAILURE
                    );
                    try {
                        Thread.sleep(1000 * i);
                    } catch (InterruptedException e) {
                        Thread.currentThread().interrupt();
                        return;
                    }
                }
            } else {
                cluster.stop(true);
                runningClusters.remove(cluster);
            }
        } else {
            int currentClaims = claimsInventory.getOrDefault(cluster, 0) - 1;
            claimsInventory.put(cluster, currentClaims);

            if (currentClaims <= 0 && runningClusters.contains(cluster)) {
                cluster.stop(false);
                runningClusters.remove(cluster);
            }
        }
    }

}