/*
 * 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.access.tests.e2e.hiveserver;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.URL;
import java.util.Map;

import com.google.common.annotations.VisibleForTesting;
import org.apache.access.binding.hive.conf.HiveAuthzConf;
import org.apache.access.provider.file.LocalGroupResourceAuthorizationProvider;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.hdfs.DistributedFileSystem;
import org.apache.hadoop.hive.conf.HiveConf;
import org.apache.hadoop.hive.conf.HiveConf.ConfVars;
import org.fest.reflect.core.Reflection;
import org.junit.Assert;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.io.Resources;

public class HiveServerFactory {
  private static final Logger LOGGER = LoggerFactory
      .getLogger(HiveServerFactory.class);
  private static final String HIVE_DRIVER_NAME = "org.apache.hive.jdbc.HiveDriver";
  private static final String DERBY_DRIVER_NAME = "org.apache.derby.jdbc.EmbeddedDriver";
  public static final String HIVESERVER2_TYPE = "access.e2etest.hiveServer2Type";
  public static final String KEEP_BASEDIR = "access.e2etest.keepBaseDir";
  public static final String METASTORE_CONNECTION_URL = HiveConf.ConfVars.METASTORECONNECTURLKEY.varname;
  public static final String WAREHOUSE_DIR = HiveConf.ConfVars.METASTOREWAREHOUSE.varname;
  public static final String AUTHZ_PROVIDER = HiveAuthzConf.AuthzConfVars.AUTHZ_PROVIDER.getVar();
  public static final String AUTHZ_PROVIDER_RESOURCE = HiveAuthzConf.AuthzConfVars.AUTHZ_PROVIDER_RESOURCE.getVar();
  public static final String AUTHZ_PROVIDER_FILENAME = "test-authz-provider.ini";
  public static final String AUTHZ_SERVER_NAME = HiveAuthzConf.AuthzConfVars.AUTHZ_SERVER_NAME.getVar();
  public static final String ACCESS_TESTING_MODE = HiveAuthzConf.AuthzConfVars.ACCESS_TESTING_MODE.getVar();
  public static final String HS2_PORT = ConfVars.HIVE_SERVER2_THRIFT_PORT.toString();
  public static final String SUPPORT_CONCURRENCY = HiveConf.ConfVars.HIVE_SUPPORT_CONCURRENCY.varname;
  public static final String HADOOPBIN = ConfVars.HADOOPBIN.toString();
  public static final String DEFAULT_AUTHZ_SERVER_NAME = "server1";


  static {
    try {
      Assert.assertNotNull(DERBY_DRIVER_NAME + " is null", Class.forName(DERBY_DRIVER_NAME));
      Assert.assertNotNull(HIVE_DRIVER_NAME + " is null", Class.forName(HIVE_DRIVER_NAME));
    } catch (ClassNotFoundException e) {
      throw new RuntimeException(e);
    }
  }

  public static HiveServer create(Map<String, String> properties,
      File baseDir, File confDir, File logDir, File policyFile,
      FileSystem fileSystem)
          throws Exception {
    String type = properties.get(HIVESERVER2_TYPE);
    if(type == null) {
      type = System.getProperty(HIVESERVER2_TYPE);
    }
    if(type == null) {
      type = HiveServer2Type.InternalHiveServer2.name();
    }
    return create(HiveServer2Type.valueOf(type.trim()), properties,
        baseDir, confDir, logDir, policyFile, fileSystem);
  }

  private static HiveServer create(HiveServer2Type type,
      Map<String, String> properties, File baseDir, File confDir,
      File logDir, File policyFile, FileSystem fileSystem) throws Exception {
    if(!properties.containsKey(WAREHOUSE_DIR)) {
      LOGGER.error("fileSystem " + fileSystem.getClass().getSimpleName());
      if (fileSystem instanceof DistributedFileSystem) {
        @SuppressWarnings("static-access")
        String dfsUri = fileSystem.getDefaultUri(fileSystem.getConf()).toString();
        LOGGER.error("dfsUri " + dfsUri);
        properties.put(WAREHOUSE_DIR, dfsUri + "/data");
      } else {
        properties.put(WAREHOUSE_DIR, new File(baseDir, "warehouse").getPath());
      }
    }
    if(!properties.containsKey(METASTORE_CONNECTION_URL)) {
      properties.put(METASTORE_CONNECTION_URL,
          String.format("jdbc:derby:;databaseName=%s;create=true",
              new File(baseDir, "metastore").getPath()));
    }
    if(policyFile.exists()) {
      LOGGER.info("Policy file " + policyFile + " exists");
    } else {
      LOGGER.info("Creating policy file " + policyFile);
      FileOutputStream to = new FileOutputStream(policyFile);
      Resources.copy(Resources.getResource(AUTHZ_PROVIDER_FILENAME), to);
      to.close();
    }
    if(!properties.containsKey(ACCESS_TESTING_MODE)) {
      properties.put(ACCESS_TESTING_MODE, "true");
    }
    if(!properties.containsKey(AUTHZ_PROVIDER_RESOURCE)) {
      properties.put(AUTHZ_PROVIDER_RESOURCE, policyFile.getPath());
    }
    if(!properties.containsKey(AUTHZ_PROVIDER)) {
      properties.put(AUTHZ_PROVIDER, LocalGroupResourceAuthorizationProvider.class.getName());
    }
    if(!properties.containsKey(AUTHZ_SERVER_NAME)) {
      properties.put(AUTHZ_SERVER_NAME, DEFAULT_AUTHZ_SERVER_NAME);
    }
    if(!properties.containsKey(HS2_PORT)) {
      properties.put(HS2_PORT, String.valueOf(findPort()));
    }
    if(!properties.containsKey(SUPPORT_CONCURRENCY)) {
      properties.put(SUPPORT_CONCURRENCY, "false");
    }
    if(!properties.containsKey(HADOOPBIN)) {
      properties.put(HADOOPBIN, "./target/hadoop/bin/hadoop");
    }
    String hadoopBinPath = properties.get(HADOOPBIN);
    Assert.assertNotNull(hadoopBinPath, "Hadoop Bin");
    File hadoopBin = new File(hadoopBinPath);
    if(!hadoopBin.isFile()) {
      Assert.fail("Path to hadoop bin " + hadoopBin.getPath() + "is invalid. "
          + "Perhaps you missed the download-hadoop profile.");
    }
    /*
     * This hack, setting the hiveSiteURL field removes a previous hack involving
     * setting of system properties for each property. Although both are hacks,
     * I prefer this hack because once the system properties are set they can
     * affect later tests unless those tests clear them. This hack allows for
     * a clean switch to a new set of defaults when a new HiveConf object is created.
     */
    Reflection.staticField("hiveSiteURL")
      .ofType(URL.class)
      .in(HiveConf.class)
      .set(null);
    HiveConf hiveConf = new HiveConf();
    HiveAuthzConf authzConf = new HiveAuthzConf(Resources.getResource("access-site.xml"));
    for(Map.Entry<String, String> entry : properties.entrySet()) {
      LOGGER.info(entry.getKey() + " => " + entry.getValue());
      hiveConf.set(entry.getKey(), entry.getValue());
      authzConf.set(entry.getKey(), entry.getValue());
    }
    File hiveSite = new File(confDir, "hive-site.xml");
    File accessSite = new File(confDir, HiveAuthzConf.AUTHZ_SITE_FILE);
    OutputStream out = new FileOutputStream(accessSite);
    authzConf.writeXml(out);
    out.close();
    // points hive-site.xml at access-site.xml
    hiveConf.set(HiveAuthzConf.HIVE_ACCESS_CONF_URL, accessSite.toURI().toURL().toExternalForm());
    hiveConf.set(HiveConf.ConfVars.HIVE_SERVER2_SESSION_HOOK.varname,
        "org.apache.access.binding.hive.HiveAuthzBindingSessionHook");
    out = new FileOutputStream(hiveSite);
    hiveConf.writeXml(out);
    out.close();

    Reflection.staticField("hiveSiteURL")
      .ofType(URL.class)
      .in(HiveConf.class)
      .set(hiveSite.toURI().toURL());

    switch (type) {
    case EmbeddedHiveServer2:
      LOGGER.info("Creating EmbeddedHiveServer");
      return new EmbeddedHiveServer();
    case InternalHiveServer2:
      LOGGER.info("Creating InternalHiveServer");
      return new InternalHiveServer(hiveConf);
    case ExternalHiveServer2:
      LOGGER.info("Creating ExternalHiveServer");
      return new ExternalHiveServer(hiveConf, confDir, logDir);
    case UnmanagedHiveServer2:
      LOGGER.info("Creating UnmanagedHiveServer");
      return new UnmanagedHiveServer(hiveConf);
    default:
      throw new UnsupportedOperationException(type.name());
    }
  }
  private static int findPort() throws IOException {
    ServerSocket socket = new ServerSocket(0);
    int port = socket.getLocalPort();
    socket.close();
    return port;
  }

  @VisibleForTesting
  public static enum HiveServer2Type {
    EmbeddedHiveServer2,           // Embedded HS2, directly executed by JDBC, without thrift
    InternalHiveServer2,        // Start a thrift HS2 in the same process
    ExternalHiveServer2,   // start a remote thrift HS2
    UnmanagedHiveServer2      // Use a remote thrift HS2 already running
    ;
  }
}