/*
 * 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
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package org.apache.flink.runtime.clusterframework.overlays;

import org.apache.flink.configuration.ConfigConstants;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.core.fs.Path;
import org.apache.flink.core.testutils.CommonTestUtils;
import org.apache.flink.runtime.clusterframework.ContainerSpecification;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.TemporaryFolder;

import java.io.File;
import java.util.HashMap;
import java.util.Map;

import static org.junit.Assert.assertEquals;

import static org.apache.flink.runtime.clusterframework.overlays.HadoopConfOverlay.TARGET_CONF_DIR;

public class HadoopConfOverlayTest extends ContainerOverlayTestBase {

	@Rule
	public TemporaryFolder tempFolder = new TemporaryFolder();

	@Test
	public void testConfigure() throws Exception {

		File confDir = tempFolder.newFolder();
		initConfDir(confDir);

		HadoopConfOverlay overlay = new HadoopConfOverlay(confDir);

		ContainerSpecification spec = new ContainerSpecification();
		overlay.configure(spec);

		assertEquals(TARGET_CONF_DIR.getPath(), spec.getEnvironmentVariables().get("HADOOP_CONF_DIR"));
		assertEquals(TARGET_CONF_DIR.getPath(), spec.getDynamicConfiguration().getString(ConfigConstants.PATH_HADOOP_CONFIG, null));

		checkArtifact(spec, new Path(TARGET_CONF_DIR, "core-site.xml"));
		checkArtifact(spec, new Path(TARGET_CONF_DIR, "hdfs-site.xml"));
	}

	@Test
	public void testNoConf() throws Exception {
		HadoopConfOverlay overlay = new HadoopConfOverlay(null);

		ContainerSpecification containerSpecification = new ContainerSpecification();
		overlay.configure(containerSpecification);
	}

	@Test
	public void testBuilderFromEnvironment() throws Exception {

		// verify that the builder picks up various environment locations
		HadoopConfOverlay.Builder builder;
		Map<String, String> env;

		// fs.hdfs.hadoopconf
		File confDir = tempFolder.newFolder();
		initConfDir(confDir);
		Configuration conf = new Configuration();
		conf.setString(ConfigConstants.PATH_HADOOP_CONFIG, confDir.getAbsolutePath());
		builder = HadoopConfOverlay.newBuilder().fromEnvironment(conf);
		assertEquals(confDir, builder.hadoopConfDir);

		// HADOOP_CONF_DIR
		env = new HashMap<String, String>(System.getenv());
		env.remove("HADOOP_HOME");
		env.put("HADOOP_CONF_DIR", confDir.getAbsolutePath());
		CommonTestUtils.setEnv(env);
		builder = HadoopConfOverlay.newBuilder().fromEnvironment(new Configuration());
		assertEquals(confDir, builder.hadoopConfDir);

		// HADOOP_HOME/conf
		File homeDir = tempFolder.newFolder();
		confDir = initConfDir(new File(homeDir, "conf"));
		env = new HashMap<String, String>(System.getenv());
		env.remove("HADOOP_CONF_DIR");
		env.put("HADOOP_HOME", homeDir.getAbsolutePath());
		CommonTestUtils.setEnv(env);
		builder = HadoopConfOverlay.newBuilder().fromEnvironment(new Configuration());
		assertEquals(confDir, builder.hadoopConfDir);

		// HADOOP_HOME/etc/hadoop
		homeDir = tempFolder.newFolder();
		confDir = initConfDir(new File(homeDir, "etc/hadoop"));
		env = new HashMap<String, String>(System.getenv());
		env.remove("HADOOP_CONF_DIR");
		env.put("HADOOP_HOME", homeDir.getAbsolutePath());
		CommonTestUtils.setEnv(env);
		builder = HadoopConfOverlay.newBuilder().fromEnvironment(new Configuration());
		assertEquals(confDir, builder.hadoopConfDir);
	}

	private File initConfDir(File confDir) throws Exception {
		confDir.mkdirs();
		new File(confDir, "core-site.xml").createNewFile();
		new File(confDir, "hdfs-site.xml").createNewFile();
		return confDir;
	}
}