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/*
 * 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;

import org.opensearch.gradle.info.GlobalBuildInfoPlugin;
import org.gradle.api.Plugin;
import org.gradle.api.Project;

import java.lang.management.ManagementFactory;
import java.nio.file.Path;

/**
 * A plugin to handle reaping external services spawned by a build if Gradle dies.
 */
public class ReaperPlugin implements Plugin {

    @Override
    public void apply(Project project) {
        if (project != project.getRootProject()) {
            throw new IllegalArgumentException("ReaperPlugin can only be applied to the root project of a build");
        }

        project.getPlugins().apply(GlobalBuildInfoPlugin.class);

        Path inputDir = project.getRootDir().toPath().resolve(".gradle").resolve("reaper").resolve("build-" + getProcessId("xx"));
        ReaperService service = project.getExtensions()
            .create("reaper", ReaperService.class, project, project.getBuildDir().toPath(), inputDir);

        project.getGradle().buildFinished(result -> service.shutdown());
    }

    private static String getProcessId(final String fallback) {
        // Note: may fail in some JVM implementations
        // therefore fallback has to be provided

        // something like '@', at least in SUN / Oracle JVMs
        final String jvmName = ManagementFactory.getRuntimeMXBean().getName();
        final int index = jvmName.indexOf('@');

        if (index < 1) {
            // part before '@' empty (index = 0) / '@' not found (index = -1)
            return fallback;
        }

        try {
            return Long.toString(Long.parseLong(jvmName.substring(0, index)));
        } catch (NumberFormatException e) {
            // ignore
        }
        return fallback;
    }
}