/*
    * 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.BufferedReader;
  import java.io.IOException;
  import java.io.PrintWriter;
  import java.net.SocketException;
  
  import org.apache.commons.net.PrintCommandListener;
  import org.apache.commons.net.nntp.NNTPClient;
  import org.apache.commons.net.nntp.NewsgroupInfo;
  
  /**
   * Sample program demonstrating the use of article header and body retrieval
   */
  public class ArticleReader {
  
      public static void main(final String[] args) throws SocketException, IOException {
  
          if (args.length != 2 && args.length != 3 && args.length != 5) {
              System.out.println("Usage: MessageThreading <hostname> <groupname> [<article specifier> [<user> <password>]]");
              return;
          }
  
          final String hostname = args[0];
          final String newsgroup = args[1];
          // Article specifier can be numeric or Id in form <m.n.o.x@host>
          final String articleSpec = args.length >= 3 ? args[2] : null;
  
          final NNTPClient client = new NNTPClient();
          client.addProtocolCommandListener(new PrintCommandListener(new PrintWriter(System.out), true));
          client.connect(hostname);
  
          if (args.length == 5) { // Optional auth
              final String user = args[3];
              final String password = args[4];
              if (!client.authenticate(user, password)) {
                  System.out.println("Authentication failed for user " + user + "!");
                  System.exit(1);
              }
          }
  
          final NewsgroupInfo group = new NewsgroupInfo();
          client.selectNewsgroup(newsgroup, group);
  
          final BufferedReader brHdr;
          String line;
          if (articleSpec != null) {
              brHdr = (BufferedReader) client.retrieveArticleHeader(articleSpec);
          } else {
              final long articleNum = group.getLastArticleLong();
              brHdr = client.retrieveArticleHeader(articleNum);
          }
          if (brHdr != null) {
              while ((line = brHdr.readLine()) != null) {
                  System.out.println(line);
              }
              brHdr.close();
          }
          final BufferedReader brBody;
          if (articleSpec != null) {
              brBody = (BufferedReader) client.retrieveArticleBody(articleSpec);
          } else {
              final long articleNum = group.getLastArticleLong();
              brBody = client.retrieveArticleBody(articleNum);
          }
          if (brBody != null) {
              while ((line = brBody.readLine()) != null) {
                  System.out.println(line);
              }
              brBody.close();
          }
      }
  
  }