/*
    * 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.tftp;
  
  import static org.junit.jupiter.api.Assertions.assertArrayEquals;
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertNotNull;
  
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  import java.net.DatagramPacket;
  import java.net.InetAddress;
  import java.net.UnknownHostException;
  import java.nio.charset.StandardCharsets;
  import java.util.Map;
  
  import org.junit.jupiter.api.Test;
  
  /**
   * Tests {@link TFTPRequestPacket}.
   */
  class TFTPRequestPacketTest {
  
      @Test
      public void testGetOptions() throws UnknownHostException, TFTPPacketException {
          final DatagramPacket datagramPacket = getDatagramPacket();
          final TFTPReadRequestPacket requestPacket = new TFTPReadRequestPacket(datagramPacket);
          assertNotNull(requestPacket.toString());
          final Map<String, String> options = requestPacket.getOptions();
          assertEquals(1, options.size());
          assertEquals("1024", options.get("blksize"));
      }
  
      @Test
      public void testNewDatagram() throws TFTPPacketException, UnknownHostException {
          final DatagramPacket datagramPacket = getDatagramPacket();
  
          final TFTPReadRequestPacket requestPacket = new TFTPReadRequestPacket(datagramPacket);
          final DatagramPacket newDatagram = requestPacket.newDatagram();
  
          assertNotNull(newDatagram);
          assertEquals(datagramPacket.getAddress(), newDatagram.getAddress());
          assertEquals(datagramPacket.getPort(), newDatagram.getPort());
          assertEquals(datagramPacket.getLength(), newDatagram.getLength());
          assertArrayEquals(datagramPacket.getData(), newDatagram.getData());
  
          final byte[] data = new byte[datagramPacket.getLength()];
          final DatagramPacket newDatagram2 = new DatagramPacket(data, data.length, InetAddress.getLocalHost(), 0);
          requestPacket.newDatagram(newDatagram2, data);
  
          assertEquals(datagramPacket.getAddress(), newDatagram2.getAddress());
          assertEquals(datagramPacket.getPort(), newDatagram2.getPort());
          assertArrayEquals(datagramPacket.getData(), data);
      }
  
      private static DatagramPacket getDatagramPacket() throws UnknownHostException {
          final ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
          byteStream.write(0);
          byteStream.write(1);
  
          try {
              byteStream.write("fileName".getBytes(StandardCharsets.US_ASCII));
              byteStream.write(0);
              byteStream.write("octet".getBytes(StandardCharsets.US_ASCII));
              byteStream.write(0);
  
              byteStream.write("blksize".getBytes(StandardCharsets.US_ASCII));
              byteStream.write(0);
              byteStream.write("1024".getBytes(StandardCharsets.US_ASCII));
              byteStream.write(0);
          } catch (final IOException e) {
              throw new RuntimeException("Error creating TFTP request packet", e);
          }
  
          final byte[] data = byteStream.toByteArray();
          return new DatagramPacket(data, data.length, InetAddress.getLocalHost(), 0);
      }
  }