// SPDX-License-Identifier: BSD-3-Clause
// -*- Java -*-
//
// Copyright (c) 2005, Matthew J. Rutherford <rutherfo@cs.colorado.edu>
// Copyright (c) 2005, University of Colorado at Boulder
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
//   notice, this list of conditions and the following disclaimer.
//
// * Redistributions in binary form must reproduce the above copyright
//   notice, this list of conditions and the following disclaimer in the
//   documentation and/or other materials provided with the distribution.
//
// * Neither the name of the University of Colorado at Boulder nor the
//   names of its contributors may be used to endorse or promote
//   products derived from this software without specific prior written
//   permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
package org.xbill.DNS;

import static org.junit.jupiter.api.Assertions.assertArrayEquals;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertThrows;

import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;

class DNSOutputTest {
  private DNSOutput m_do;

  @BeforeEach
  void setUp() {
    m_do = new DNSOutput(1);
  }

  @Test
  void default_ctor() {
    m_do = new DNSOutput();
    assertEquals(0, m_do.current());
  }

  @Test
  void initial_state() {
    assertEquals(0, m_do.current());
    assertThrows(IllegalStateException.class, () -> m_do.restore());
    assertThrows(IllegalArgumentException.class, () -> m_do.jump(1));
  }

  @Test
  void writeU8_basic() {
    m_do.writeU8(1);
    assertEquals(1, m_do.current());

    byte[] curr = m_do.toByteArray();
    assertEquals(1, curr.length);
    assertEquals(1, curr[0]);
  }

  @Test
  void writeU8_expand() {
    // starts off at 1;
    m_do.writeU8(1);
    m_do.writeU8(2);

    assertEquals(2, m_do.current());

    byte[] curr = m_do.toByteArray();
    assertEquals(2, curr.length);
    assertEquals(1, curr[0]);
    assertEquals(2, curr[1]);
  }

  @Test
  void writeU8_max() {
    m_do.writeU8(0xFF);
    byte[] curr = m_do.toByteArray();
    assertEquals((byte) 0xFF, curr[0]);
  }

  @Test
  void writeU8_toobig() {
    assertThrows(IllegalArgumentException.class, () -> m_do.writeU8(0x1FF));
  }

  @Test
  void writeU16_basic() {
    m_do.writeU16(0x100);
    assertEquals(2, m_do.current());

    byte[] curr = m_do.toByteArray();
    assertEquals(2, curr.length);
    assertEquals(1, curr[0]);
    assertEquals(0, curr[1]);
  }

  @Test
  void writeU16_max() {
    m_do.writeU16(0xFFFF);
    byte[] curr = m_do.toByteArray();
    assertEquals((byte) 0xFF, curr[0]);
    assertEquals((byte) 0XFF, curr[1]);
  }

  @Test
  void writeU16_toobig() {
    assertThrows(IllegalArgumentException.class, () -> m_do.writeU16(0x1FFFF));
  }

  @Test
  void writeU32_basic() {
    m_do.writeU32(0x11001011);
    assertEquals(4, m_do.current());

    byte[] curr = m_do.toByteArray();
    assertEquals(4, curr.length);
    assertEquals(0x11, curr[0]);
    assertEquals(0x00, curr[1]);
    assertEquals(0x10, curr[2]);
    assertEquals(0x11, curr[3]);
  }

  @Test
  void writeU32_max() {
    m_do.writeU32(0xFFFFFFFFL);
    byte[] curr = m_do.toByteArray();
    assertEquals((byte) 0xFF, curr[0]);
    assertEquals((byte) 0XFF, curr[1]);
    assertEquals((byte) 0XFF, curr[2]);
    assertEquals((byte) 0XFF, curr[3]);
  }

  @Test
  void writeU32_toobig() {
    assertThrows(IllegalArgumentException.class, () -> m_do.writeU32(0x1FFFFFFFFL));
  }

  @Test
  void jump_basic() {
    m_do.writeU32(0x11223344L);
    assertEquals(4, m_do.current());
    m_do.jump(2);
    assertEquals(2, m_do.current());
    m_do.writeU8(0x99);
    byte[] curr = m_do.toByteArray();
    assertEquals(3, curr.length);
    assertEquals(0x11, curr[0]);
    assertEquals(0x22, curr[1]);
    assertEquals((byte) 0x99, curr[2]);
  }

  @Test
  void writeByteArray_1arg() {
    byte[] in = new byte[] {(byte) 0xAB, (byte) 0xCD, (byte) 0xEF, (byte) 0x12, (byte) 0x34};
    m_do.writeByteArray(in);
    assertEquals(5, m_do.current());
    byte[] curr = m_do.toByteArray();
    assertArrayEquals(in, curr);
  }

  @Test
  void writeByteArray_3arg() {
    byte[] in = new byte[] {(byte) 0xAB, (byte) 0xCD, (byte) 0xEF, (byte) 0x12, (byte) 0x34};
    m_do.writeByteArray(in, 2, 3);
    assertEquals(3, m_do.current());
    byte[] exp = new byte[] {in[2], in[3], in[4]};
    byte[] curr = m_do.toByteArray();
    assertArrayEquals(exp, curr);
  }

  @Test
  void writeCountedString_basic() {
    byte[] in = new byte[] {'h', 'e', 'l', 'L', '0'};
    m_do.writeCountedString(in);
    assertEquals(in.length + 1, m_do.current());
    byte[] curr = m_do.toByteArray();
    byte[] exp = new byte[] {(byte) in.length, in[0], in[1], in[2], in[3], in[4]};
    assertArrayEquals(exp, curr);
  }

  @Test
  void writeCountedString_empty() {
    byte[] in = new byte[] {};
    m_do.writeCountedString(in);
    assertEquals(in.length + 1, m_do.current());
    byte[] curr = m_do.toByteArray();
    byte[] exp = new byte[] {(byte) in.length};
    assertArrayEquals(exp, curr);
  }

  @Test
  void writeCountedString_toobig() {
    byte[] in = new byte[256];
    assertThrows(IllegalArgumentException.class, () -> m_do.writeCountedString(in));
  }

  @Test
  void save_restore() {
    m_do.writeU32(0x12345678L);
    assertEquals(4, m_do.current());
    m_do.save();
    m_do.writeU16(0xABCD);
    assertEquals(6, m_do.current());
    m_do.restore();
    assertEquals(4, m_do.current());
    assertThrows(IllegalStateException.class, () -> m_do.restore());
  }
}