/*
    * 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.FileNotFoundException;
  import java.io.IOException;
  import java.io.InputStreamReader;
  import java.io.Reader;
  import java.io.Writer;
  import java.nio.charset.Charset;
  import java.nio.file.Files;
  import java.nio.file.Paths;
  
  import org.apache.commons.net.PrintCommandListener;
  import org.apache.commons.net.io.Util;
  import org.apache.commons.net.nntp.NNTPClient;
  import org.apache.commons.net.nntp.NNTPReply;
  import org.apache.commons.net.nntp.SimpleNNTPHeader;
  
  /**
   * This is an example program using the NNTP package to post an article to the specified newsgroup(s). It prompts you for header information and a file name to
   * post.
   */
  
  public final class PostMessage {
  
      public static void main(final String[] args) {
          final String from;
          final String subject;
          String newsgroup;
          final String fileName;
          final String server;
          final String organization;
          final String references;
          final BufferedReader stdin;
          Reader fileReader = null;
          final SimpleNNTPHeader header;
          final NNTPClient client;
  
          if (args.length < 1) {
              System.err.println("Usage: post newsserver");
              System.exit(1);
          }
  
          server = args[0];
  
          stdin = new BufferedReader(new InputStreamReader(System.in, Charset.defaultCharset()));
  
          try {
              System.out.print("From: ");
              System.out.flush();
  
              from = stdin.readLine();
  
              System.out.print("Subject: ");
              System.out.flush();
  
              subject = stdin.readLine();
  
              header = new SimpleNNTPHeader(from, subject);
  
              System.out.print("Newsgroup: ");
              System.out.flush();
  
              newsgroup = stdin.readLine();
              header.addNewsgroup(newsgroup);
  
              while (true) {
                  System.out.print("Additional Newsgroup <Hit enter to end>: ");
                  System.out.flush();
  
                  newsgroup = stdin.readLine();
                  if (newsgroup == null) {
                      break;
                  }
  
                  newsgroup = newsgroup.trim();
  
                  if (newsgroup.isEmpty()) {
                      break;
                  }
  
                  header.addNewsgroup(newsgroup);
             }
 
             System.out.print("Organization: ");
             System.out.flush();
 
             organization = stdin.readLine();
 
             System.out.print("References: ");
             System.out.flush();
 
             references = stdin.readLine();
 
             if (organization != null && !organization.isEmpty()) {
                 header.addHeaderField("Organization", organization);
             }
 
             if (references != null && !references.isEmpty()) {
                 header.addHeaderField("References", references);
             }
 
             header.addHeaderField("X-Newsreader", "NetComponents");
 
             System.out.print("Filename: ");
             System.out.flush();
 
             fileName = stdin.readLine();
 
             try {
                 fileReader = Files.newBufferedReader(Paths.get(fileName), Charset.defaultCharset());
             } catch (final FileNotFoundException e) {
                 System.err.println("File not found. " + e.getMessage());
                 System.exit(1);
             }
 
             client = new NNTPClient();
             client.addProtocolCommandListener(new PrintCommandListener(Util.newPrintWriter(System.out), true));
 
             client.connect(server);
 
             if (!NNTPReply.isPositiveCompletion(client.getReplyCode())) {
                 client.disconnect();
                 System.err.println("NNTP server refused connection.");
                 System.exit(1);
             }
 
             if (client.isAllowedToPost()) {
                 final Writer writer = client.postArticle();
 
                 if (writer != null) {
                     writer.write(header.toString());
                     Util.copyReader(fileReader, writer);
                     writer.close();
                     client.completePendingCommand();
                 }
             }
 
             fileReader.close();
 
             client.logout();
 
             client.disconnect();
         } catch (final IOException e) {
             e.printStackTrace();
             System.exit(1);
         }
     }
 }