/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */

/*

 * Copyright (c) 2014 Natale Patriciello <natale.patriciello@gmail.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation;

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 *

 */

#include "ns3/test.h"

#include "ns3/core-module.h"

#include "ns3/tcp-option.h"

#include "ns3/private/tcp-option-winscale.h"

#include "ns3/private/tcp-option-ts.h"

#include <string.h>

namespace ns3 {

class TcpOptionWSTestCase : public TestCase

{

public:

  TcpOptionWSTestCase (std::string name, uint8_t scale);

  void TestSerialize ();

  void TestDeserialize ();

private:

  virtual void DoRun (void);

  virtual void DoTeardown (void);

  uint8_t m_scale;

  Buffer m_buffer;

};

TcpOptionWSTestCase::TcpOptionWSTestCase (std::string name, uint8_t scale)

  : TestCase (name)

{

  m_scale = scale;

}

void

TcpOptionWSTestCase::DoRun ()

{

  TestSerialize ();

  TestDeserialize ();

}

void

TcpOptionWSTestCase::TestSerialize ()

{

  TcpOptionWinScale opt;

  opt.SetScale (m_scale);

  NS_TEST_EXPECT_MSG_EQ (m_scale, opt.GetScale (), "Scale isn't saved correctly");

  m_buffer.AddAtStart (opt.GetSerializedSize ());

  opt.Serialize (m_buffer.Begin ());

}

void

TcpOptionWSTestCase::TestDeserialize ()

{

  TcpOptionWinScale opt;

  Buffer::Iterator start = m_buffer.Begin ();

  uint8_t kind = start.PeekU8 ();

  NS_TEST_EXPECT_MSG_EQ (kind, TcpOption::WINSCALE, "Different kind found");

  opt.Deserialize (start);

  NS_TEST_EXPECT_MSG_EQ (m_scale, opt.GetScale (), "Different scale found");

}

void

TcpOptionWSTestCase::DoTeardown ()

{

}

class TcpOptionTSTestCase : public TestCase

{

public:

  TcpOptionTSTestCase (std::string name);

  void TestSerialize ();

  void TestDeserialize ();

private:

  virtual void DoRun (void);

  virtual void DoTeardown (void);

  uint32_t m_timestamp;

  uint32_t m_echo;

  Buffer m_buffer;

};

TcpOptionTSTestCase::TcpOptionTSTestCase (std::string name)

  : TestCase (name)

{

}

void

TcpOptionTSTestCase::DoRun ()

{

  Ptr<UniformRandomVariable> x = CreateObject<UniformRandomVariable> ();

  for (uint32_t i = 0; i < 1000; ++i)

    {

      m_timestamp = x->GetInteger ();

      m_echo = x->GetInteger ();

      TestSerialize ();

      TestDeserialize ();

    }

}

void

TcpOptionTSTestCase::TestSerialize ()

{

  TcpOptionTS opt;

  opt.SetTimestamp (m_timestamp);

  opt.SetEcho (m_echo);

  NS_TEST_EXPECT_MSG_EQ (m_timestamp, opt.GetTimestamp (), "TS isn't saved correctly");

  NS_TEST_EXPECT_MSG_EQ (m_echo, opt.GetEcho (), "echo isn't saved correctly");

  m_buffer.AddAtStart (opt.GetSerializedSize ());

  opt.Serialize (m_buffer.Begin ());

}

void

TcpOptionTSTestCase::TestDeserialize ()

{

  TcpOptionTS opt;

  Buffer::Iterator start = m_buffer.Begin ();

  uint8_t kind = start.PeekU8 ();

  NS_TEST_EXPECT_MSG_EQ (kind, TcpOption::TS, "Different kind found");

  opt.Deserialize (start);

  NS_TEST_EXPECT_MSG_EQ (m_timestamp, opt.GetTimestamp (), "Different TS found");

  NS_TEST_EXPECT_MSG_EQ (m_echo, opt.GetEcho (), "Different echo found");

}

void

TcpOptionTSTestCase::DoTeardown ()

{

}

static class TcpOptionTestSuite : public TestSuite

{

public:

  TcpOptionTestSuite ()

    : TestSuite ("tcp-option", UNIT)

  {

    for (uint8_t i = 0; i < 15; ++i)

      {

        AddTestCase (new TcpOptionWSTestCase ("Testing window "

                                              "scale value", i), TestCase::QUICK);

      }

    AddTestCase (new TcpOptionTSTestCase ("Testing serialization of random values for timestamp"), TestCase::QUICK);

  }

} g_TcpOptionTestSuite;

} // namespace ns3