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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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.
 */

package org.apache.flink.kubernetes.utils;

import org.apache.flink.configuration.Configuration;
import org.apache.flink.core.plugin.PluginUtils;
import org.apache.flink.kubernetes.configuration.KubernetesConfigOptionsInternal;
import org.apache.flink.kubernetes.kubeclient.parameters.KubernetesJobManagerParameters;
import org.apache.flink.runtime.jobgraph.JobGraph;

import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.HdfsConfiguration;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.net.URL;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Optional;

import static org.apache.flink.runtime.entrypoint.component.FileJobGraphRetriever.JOB_GRAPH_FILE_PATH;

/**
 * Utilities for the init Container.
 */
public class KubernetesInitializerUtils {

	private static final Logger LOG = LoggerFactory.getLogger(KubernetesInitializerUtils.class);

	public static void uploadLocalDependencies(
			Configuration flinkConfig,
			JobGraph jobGraph,
			KubernetesJobManagerParameters kubernetesJobManagerParameters,
			String clusterId) throws IOException {

		final String jarsDownloadDir = kubernetesJobManagerParameters.getJarsDownloadDirInPod();
		final String filesDownloadDir = kubernetesJobManagerParameters.getFilesDownloadDirInPod();

		final Optional localHadoopConfigirationDirectoryOption =
			kubernetesJobManagerParameters.getLocalHadoopConfigurationDirectory();

		if (!localHadoopConfigirationDirectoryOption.isPresent()) {
			throw new RuntimeException("Failed to find hadoop configuration directory.");
		}

		// ------------------ Initialize the file systems -------------------------
		org.apache.flink.core.fs.FileSystem.initialize(
			flinkConfig,
			PluginUtils.createPluginManagerFromRootFolder(flinkConfig));

		// initialize file system
		// Copy the application master jar to the filesystem
		// Create a local resource to point to the destination jar path
		final HdfsConfiguration hdfsConfiguration = new HdfsConfiguration();
		final FileSystem fs = FileSystem.get(hdfsConfiguration);
		final Path homeDir = fs.getHomeDirectory();

		final List userJarDst = new ArrayList<>();
		final List classPaths = new ArrayList<>(jobGraph.getClasspaths());

		final long currentTimeMillis = System.currentTimeMillis();
		for (org.apache.flink.core.fs.Path path: jobGraph.getUserJars()) {
			final String suffix = ".flink/" + clusterId + "/" + currentTimeMillis + "/" + path.getName();
			final Path dst = new Path(homeDir, suffix);
			final Path localSrcPath = new Path(path.getPath());
			LOG.debug("Copying from {} to {} ", localSrcPath, dst);
			fs.copyFromLocalFile(false, true, localSrcPath, dst);
			userJarDst.add(dst.toUri().getRawPath());
			classPaths.add(new URL("file://" + jarsDownloadDir + "/" + path.getName()));
		}
		flinkConfig.set(KubernetesConfigOptionsInternal.REMOTE_JAR_DEPENDENCIES, userJarDst);
		jobGraph.setClasspaths(classPaths);

		// write job graph to tmp file and upload it to remote DFS
		File tmpJobGraphFile = null;
		try {
			tmpJobGraphFile = File.createTempFile(clusterId, null);
			try (FileOutputStream output = new FileOutputStream(tmpJobGraphFile);
				ObjectOutputStream obOutput = new ObjectOutputStream(output)) {
				obOutput.writeObject(jobGraph);
			}

			final String jobGraphFilename = "job.graph";
			final String suffix = ".flink/" + clusterId + "/" + currentTimeMillis + "/" + jobGraphFilename;
			final Path dst = new Path(homeDir, suffix);
			final Path localSrcPath = new Path(tmpJobGraphFile.toURI());
			LOG.debug("Copying from {} to {} ", localSrcPath, dst);
			fs.copyFromLocalFile(false, true, localSrcPath, dst);

			flinkConfig.setString(JOB_GRAPH_FILE_PATH, filesDownloadDir + "/" + jobGraphFilename);
			flinkConfig.set(KubernetesConfigOptionsInternal.REMOTE_FILE_DEPENDENCIES, Collections.singletonList(dst.toUri().getRawPath()));
		} catch (Exception e) {
			LOG.warn("Failed to upload job graph file");
			throw e;
		} finally {
			if (tmpJobGraphFile != null && !tmpJobGraphFile.delete()) {
				LOG.warn("Fail to delete temporary JobGraph file {}.", tmpJobGraphFile.toPath());
			}
		}
	}

	private KubernetesInitializerUtils() {}
}