/*
 * 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.accumulo.testing;

import java.lang.management.ManagementFactory;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;

import org.apache.accumulo.core.client.Accumulo;
import org.apache.accumulo.core.client.AccumuloClient;
import org.apache.accumulo.core.client.security.tokens.AuthenticationToken;
import org.apache.accumulo.core.conf.ClientProperty;
import org.apache.hadoop.conf.Configuration;

public class TestEnv implements AutoCloseable {

  protected final Properties testProps;
  private String clientPropsPath;
  private final Properties clientProps;
  private AccumuloClient client = null;
  private Configuration hadoopConfig = null;

  public TestEnv(String[] args) {

    Map<String,String> options = new HashMap<>();
    List<String> arguments = new ArrayList<>();

    for (int i = 0; i < args.length; i++) {
      if (args[i].equals("-o")) {
        i++;
        String[] tokens = args[i].split("=", 2);
        options.put(tokens[0], tokens[1]);
      } else {
        arguments.add(args[i]);
      }
    }

    if (arguments.size() != 2) {
      throw new IllegalArgumentException("Expected <testPropsPath> <clientPropsPath> arguments.");
    }

    String testPropsPath = arguments.get(0);
    clientPropsPath = arguments.get(1);

    this.testProps = TestProps.loadFromFile(testPropsPath);
    this.clientProps = Accumulo.newClientProperties().from(clientPropsPath).build();

    options.forEach((k, v) -> testProps.setProperty(k, v));
  }

  public TestEnv(String testPropsPath, String clientPropsPath) {
    this(new String[] {testPropsPath, clientPropsPath});
  }

  private Properties copyProperties(Properties props) {
    Properties result = new Properties();
    props.forEach((key, value) -> result.setProperty((String) key, (String) value));
    return result;
  }

  /**
   * @return a copy of the test properties
   */
  public Properties getTestProperties() {
    return copyProperties(testProps);
  }

  /**
   * @return a test property value given a key
   */
  public String getTestProperty(String key) {
    return testProps.getProperty(key);
  }

  public String getClientPropsPath() {
    return clientPropsPath;
  }

  public Properties getClientProps() {
    return copyProperties(clientProps);
  }

  /**
   * Gets the configured username.
   *
   * @return username
   */
  public String getAccumuloUserName() {
    return ClientProperty.AUTH_PRINCIPAL.getValue(clientProps);
  }

  /**
   * Gets the configured password.
   *
   * @return password
   */
  public String getAccumuloPassword() {
    String authType = ClientProperty.AUTH_TYPE.getValue(clientProps);
    if (authType.equals("password")) {
      return ClientProperty.AUTH_TOKEN.getValue(clientProps);
    }
    return null;
  }

  /**
   * Gets this process's ID.
   *
   * @return pid
   */
  public String getPid() {
    return ManagementFactory.getRuntimeMXBean().getName().split("@")[0];
  }

  public Configuration getHadoopConfiguration() {
    if (hadoopConfig == null) {
      hadoopConfig = new Configuration();
      hadoopConfig.set("fs.defaultFS", getHdfsRoot());
      // Below is required due to bundled jar breaking default config.
      // See http://stackoverflow.com/questions/17265002/hadoop-no-filesystem-for-scheme-file
      hadoopConfig.set("fs.hdfs.impl",
          org.apache.hadoop.hdfs.DistributedFileSystem.class.getName());
      hadoopConfig.set("fs.file.impl", org.apache.hadoop.fs.LocalFileSystem.class.getName());
      hadoopConfig.set("mapreduce.framework.name", "yarn");
      hadoopConfig.set("yarn.resourcemanager.hostname", getYarnResourceManager());
      String hadoopHome = System.getenv("HADOOP_HOME");
      if (hadoopHome == null) {
        throw new IllegalArgumentException("HADOOP_HOME must be set in env");
      }
      hadoopConfig.set("yarn.app.mapreduce.am.env", "HADOOP_MAPRED_HOME=" + hadoopHome);
      hadoopConfig.set("mapreduce.map.env", "HADOOP_MAPRED_HOME=" + hadoopHome);
      hadoopConfig.set("mapreduce.reduce.env", "HADOOP_MAPRED_HOME=" + hadoopHome);
    }
    return hadoopConfig;
  }

  /**
   * Gets an authentication token based on the configured password.
   */
  public AuthenticationToken getToken() {
    return ClientProperty.getAuthenticationToken(clientProps);
  }

  public String getHdfsRoot() {
    return testProps.getProperty(TestProps.HDFS_ROOT);
  }

  public String getYarnResourceManager() {
    return testProps.getProperty(TestProps.YARN_RESOURCE_MANAGER);
  }

  /**
   * Gets an Accumulo client. The same client is reused after the first call.
   */
  public synchronized AccumuloClient getAccumuloClient() {
    if (client == null) {
      client = Accumulo.newClient().from(clientProps).build();
    }
    return client;
  }

  public AccumuloClient createClient(String principal, AuthenticationToken token) {
    return Accumulo.newClient().from(clientProps).as(principal, token).build();
  }

  @Override
  public void close() throws Exception {
    if (client != null) {
      client.close();
    }
  }
}