/*
    * The contents of this file are subject to the terms of the Common Development and
    * Distribution License (the License). You may not use this file except in compliance with the
    * License.
    *
    * You can obtain a copy of the License at legal/CDDLv1.0.txt. See the License for the
    * specific language governing permission and limitations under the License.
    *
    * When distributing Covered Software, include this CDDL Header Notice in each file and include
   * the License file at legal/CDDLv1.0.txt. If applicable, add the following below the CDDL
   * Header, with the fields enclosed by brackets [] replaced by your own identifying
   * information: "Portions Copyright [year] [name of copyright owner]".
   *
   * Copyright 2015 ForgeRock AS.
   */
  
  package org.forgerock.opendj.examples;
  
  import static org.forgerock.util.Utils.closeSilently;
  import org.forgerock.opendj.ldap.Connection;
  import org.forgerock.opendj.ldap.LDAPConnectionFactory;
  import org.forgerock.opendj.ldap.LdapException;
  import org.forgerock.opendj.ldap.ResultCode;
  import org.forgerock.opendj.ldap.requests.Requests;
  import org.forgerock.opendj.ldap.responses.BindResult;
  import org.forgerock.opendj.ldap.responses.Result;
  import org.forgerock.util.AsyncFunction;
  import org.forgerock.util.promise.ExceptionHandler;
  import org.forgerock.util.promise.Promise;
  import org.forgerock.util.promise.ResultHandler;
  
  import java.io.BufferedReader;
  import java.io.FileInputStream;
  import java.io.FileNotFoundException;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.InputStreamReader;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.concurrent.CountDownLatch;
  
  /**
   * An example client application which applies update operations to a directory server
   * using the asynchronous APIs.
   * The update operations are read from an LDIF file, or stdin if no filename is provided.
   * This example takes the following command line parameters,
   * reading from stdin if no LDIF file is provided:
   *
   * <pre>
   *  {@code <host> <port> <username> <password> [<ldifFile>]}
   * </pre>
   */
  public final class ModifyAsync {
      /** Connection to the LDAP server. */
      private static Connection connection;
      /** Result for the modify operation. */
      private static int resultCode;
      /** Count down latch to wait for modify operation to complete. */
      private static final CountDownLatch COMPLETION_LATCH = new CountDownLatch(1);
  
      /**
       * Main method.
       *
       * @param args
       *            The command line arguments: host, port, username, password,
       *            LDIF file name containing the update operations.
       *            Stdin is used if no LDIF file name is provided.
       */
      public static void main(final String[] args) {
          if (args.length < 4 || args.length > 5) {
              System.err.println("Usage: host port username password [ldifFileName]");
              System.exit(1);
          }
  
          // Parse command line arguments.
          final String hostName = args[0];
          final int port = Integer.parseInt(args[1]);
          final String userName = args[2];
          final char[] password = args[3].toCharArray();
  
          // Create the LDIF reader using either the named file, if provided, or stdin.
          InputStream ldif;
          if (args.length > 4) {
              try {
                  ldif = new FileInputStream(args[4]);
              } catch (final FileNotFoundException e) {
                  System.err.println(e.getMessage());
                  System.exit(ResultCode.CLIENT_SIDE_PARAM_ERROR.intValue());
                  return;
              }
          } else {
              ldif = System.in;
          }
          final String[] ldifLines = getInputLines(ldif);
  
          // Connect to the server, bind, and request the modifications.
          new LDAPConnectionFactory(hostName, port)
                  .getConnectionAsync()
                  .thenAsync(new AsyncFunction<Connection, BindResult, LdapException>() {
                     @Override
                     public Promise<BindResult, LdapException> apply(Connection connection)
                             throws LdapException {
                         ModifyAsync.connection = connection;
                         return connection.bindAsync(
                                 Requests.newSimpleBindRequest(userName, password));
                     }
                 })
                 .thenAsync(new AsyncFunction<BindResult, Result, LdapException>() {
                     @Override
                     public Promise<Result, LdapException> apply(BindResult bindResult)
                             throws LdapException {
                         return connection.modifyAsync(
                                 Requests.newModifyRequest(ldifLines));
                     }
                 })
                 .thenOnResult(new ResultHandler<Result>() {
                     @Override
                     public void handleResult(Result result) {
                         resultCode = result.getResultCode().intValue();
                         COMPLETION_LATCH.countDown();
                     }
                 })
                 .thenOnException(new ExceptionHandler<LdapException>() {
                     @Override
                     public void handleException(LdapException e) {
                         System.err.println(e.getMessage());
                         resultCode = e.getResult().getResultCode().intValue();
                         COMPLETION_LATCH.countDown();
                     }
                 });
 
         try {
             COMPLETION_LATCH.await();
         } catch (InterruptedException e) {
             System.err.println(e.getMessage());
             System.exit(ResultCode.CLIENT_SIDE_USER_CANCELLED.intValue());
             return;
         }
 
         closeSilently(connection);
         System.exit(resultCode);
     }
 
     /**
      * Returns the lines from the input stream.
      * @param in    The input stream.
      * @return The lines from the input stream.
      */
     private static String[] getInputLines(final InputStream in) {
         String line;
         final BufferedReader reader = new BufferedReader(new InputStreamReader(in));
         final List<String> lines = new ArrayList<>();
         try {
             while ((line = reader.readLine()) != null) {
                 lines.add(line);
             }
         } catch (IOException e) {
             System.err.println(e.getMessage());
             System.exit(ResultCode.CLIENT_SIDE_LOCAL_ERROR.intValue());
         }
         return lines.toArray(new String[lines.size()]);
     }
 
     private ModifyAsync() {
         // Not used.
     }
 }