/*
    * 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.commons.net.examples.nntp;
  
  import java.io.IOException;
  import java.io.PrintWriter;
  import java.net.SocketException;
  
  import org.apache.commons.net.PrintCommandListener;
  import org.apache.commons.net.nntp.Article;
  import org.apache.commons.net.nntp.NNTPClient;
  import org.apache.commons.net.nntp.NewsgroupInfo;
  import org.apache.commons.net.nntp.Threader;
  
  /**
   * Sample program demonstrating the use of article iteration and threading.
   */
  public class MessageThreading {
      public static void main(final String[] args) throws SocketException, IOException {
  
          if (args.length != 2 && args.length != 4) {
              System.out.println("Usage: MessageThreading <hostname> <groupname> [<user> <password>]");
              return;
          }
  
          final String hostname = args[0];
          final String newsgroup = args[1];
  
          final NNTPClient client = new NNTPClient();
          client.addProtocolCommandListener(new PrintCommandListener(new PrintWriter(System.out), true));
          client.connect(hostname);
  
          if (args.length == 4) { // Optional auth
              final String user = args[2];
              final String password = args[3];
              if (!client.authenticate(user, password)) {
                  System.out.println("Authentication failed for user " + user + "!");
                  System.exit(1);
              }
          }
  
          final String[] fmt = client.listOverviewFmt();
          if (fmt != null) {
              System.out.println("LIST OVERVIEW.FMT:");
              for (final String s : fmt) {
                  System.out.println(s);
              }
          } else {
              System.out.println("Failed to get OVERVIEW.FMT");
          }
          final NewsgroupInfo group = new NewsgroupInfo();
          client.selectNewsgroup(newsgroup, group);
  
          final long lowArticleNumber = group.getFirstArticleLong();
          final long highArticleNumber = lowArticleNumber + 5000;
  
          System.out.println("Retrieving articles between [" + lowArticleNumber + "] and [" + highArticleNumber + "]");
          final Iterable<Article> articles = client.iterateArticleInfo(lowArticleNumber, highArticleNumber);
  
          System.out.println("Building message thread tree...");
          final Threader threader = new Threader();
          final Article root = (Article) threader.thread(articles);
  
          Article.printThread(root, 0);
      }
  
      public MessageThreading() {
      }
  
  }