/*
    * 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
    *
    *      https://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.mail;
  
  import java.io.BufferedReader;
  import java.io.FileNotFoundException;
  import java.io.IOException;
  import java.io.InputStreamReader;
  import java.io.Writer;
  import java.nio.charset.Charset;
  import java.nio.file.Files;
  import java.nio.file.Paths;
  import java.util.ArrayList;
  import java.util.List;
  
  import org.apache.commons.io.IOUtils;
  import org.apache.commons.net.examples.PrintCommandListeners;
  import org.apache.commons.net.io.Util;
  import org.apache.commons.net.smtp.SMTPClient;
  import org.apache.commons.net.smtp.SMTPReply;
  import org.apache.commons.net.smtp.SimpleSMTPHeader;
  
  /**
   * This is an example program using the SMTP package to send a message to the specified recipients. It prompts you for header information and a file name
   * containing the message.
   */
  
  public final class SMTPMail {
  
      public static void main(final String[] args) {
          final String sender;
          final String recipient;
          final String subject;
          final String fileName;
          final String server;
          String cc;
          final List<String> ccList = new ArrayList<>();
          final BufferedReader stdin;
          BufferedReader fileReader = null;
          final Writer writer;
          final SimpleSMTPHeader header;
          final SMTPClient client;
  
          if (args.length < 1) {
              System.err.println("Usage: SMTPMail <smtpserver>");
              System.exit(1);
          }
  
          server = args[0];
  
          stdin = new BufferedReader(new InputStreamReader(System.in, Charset.defaultCharset()));
  
          try {
              System.out.print("From: ");
              System.out.flush();
  
              sender = stdin.readLine();
  
              System.out.print("To: ");
              System.out.flush();
  
              recipient = stdin.readLine();
  
              System.out.print("Subject: ");
              System.out.flush();
  
              subject = stdin.readLine();
  
              header = new SimpleSMTPHeader(sender, recipient, subject);
  
              while (true) {
                  System.out.print("CC <enter one address per line, hit enter to end>: ");
                  System.out.flush();
  
                  cc = stdin.readLine();
  
                  if (cc == null || cc.isEmpty()) {
                      break;
                  }
  
                  header.addCC(cc.trim());
                  ccList.add(cc.trim());
              }
  
             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());
             }
 
             client = new SMTPClient();
             client.addProtocolCommandListener(PrintCommandListeners.sysOutPrintCommandListener());
 
             client.connect(server);
 
             if (!SMTPReply.isPositiveCompletion(client.getReplyCode())) {
                 client.disconnect();
                 System.err.println("SMTP server refused connection.");
                 System.exit(1);
             }
 
             client.login();
 
             client.setSender(sender);
             client.addRecipient(recipient);
 
             for (final String recpt : ccList) {
                 client.addRecipient(recpt);
             }
 
             writer = client.sendMessageData();
 
             if (writer != null) {
                 writer.write(header.toString());
                 Util.copyReader(fileReader, writer);
                 writer.close();
                 client.completePendingCommand();
             }
             IOUtils.close(fileReader);
             client.logout();
             client.disconnect();
         } catch (final IOException e) {
             e.printStackTrace();
             System.exit(1);
         }
     }
 }