/*
 * 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.docker;

import org.gradle.api.Plugin;
import org.gradle.api.Project;
import org.gradle.api.Task;
import org.gradle.api.provider.Provider;

import java.io.File;
import java.util.List;
import java.util.stream.Collectors;

/**
 * Plugin providing {@link DockerSupportService} for detecting Docker installations and determining requirements for Docker-based
 * OpenSearch build tasks.
 */
public class DockerSupportPlugin implements Plugin<Project> {
    public static final String DOCKER_SUPPORT_SERVICE_NAME = "dockerSupportService";
    public static final String DOCKER_ON_LINUX_EXCLUSIONS_FILE = ".ci/dockerOnLinuxExclusions";

    @Override
    public void apply(Project project) {
        if (project != project.getRootProject()) {
            throw new IllegalStateException(this.getClass().getName() + " can only be applied to the root project.");
        }

        Provider<DockerSupportService> dockerSupportServiceProvider = project.getGradle()
            .getSharedServices()
            .registerIfAbsent(
                DOCKER_SUPPORT_SERVICE_NAME,
                DockerSupportService.class,
                spec -> spec.parameters(
                    params -> { params.setExclusionsFile(new File(project.getRootDir(), DOCKER_ON_LINUX_EXCLUSIONS_FILE)); }
                )
            );

        // Ensure that if we are trying to run any DockerBuildTask tasks, we assert an available Docker installation exists
        project.getGradle().getTaskGraph().whenReady(graph -> {
            List<String> dockerTasks = graph.getAllTasks()
                .stream()
                .filter(task -> task instanceof DockerBuildTask)
                .map(Task::getPath)
                .collect(Collectors.toList());

            if (dockerTasks.isEmpty() == false) {
                dockerSupportServiceProvider.get().failIfDockerUnavailable(dockerTasks);
            }
        });
    }

}
