/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/**
 * Copyright (c) 2014-2015,  Regents of the University of California,
 *                           Arizona Board of Regents,
 *                           Colorado State University,
 *                           University Pierre & Marie Curie, Sorbonne University,
 *                           Washington University in St. Louis,
 *                           Beijing Institute of Technology,
 *                           The University of Memphis.
 *
 * This file is part of NFD (Named Data Networking Forwarding Daemon).
 * See AUTHORS.md for complete list of NFD authors and contributors.
 *
 * NFD is free software: you can redistribute it and/or modify it under the terms
 * of the GNU General Public License as published by the Free Software Foundation,
 * either version 3 of the License, or (at your option) any later version.
 *
 * NFD 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
 * NFD, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "face/unix-stream-channel.hpp"
#include "face/unix-stream-face.hpp"
#include "face/unix-stream-factory.hpp"

#include "tests/test-common.hpp"
#include "tests/limited-io.hpp"
#include "dummy-stream-sender.hpp"
#include "packet-datasets.hpp"

namespace nfd {
namespace tests {

using namespace boost::asio::local;

#define CHANNEL_PATH1 "unix-stream-test.1.sock"
#define CHANNEL_PATH2 "unix-stream-test.2.sock"

BOOST_FIXTURE_TEST_SUITE(FaceUnixStream, BaseFixture)

BOOST_AUTO_TEST_CASE(ChannelMap)
{
  UnixStreamFactory factory;

  shared_ptr<UnixStreamChannel> channel1 = factory.createChannel(CHANNEL_PATH1);
  shared_ptr<UnixStreamChannel> channel1a = factory.createChannel(CHANNEL_PATH1);
  BOOST_CHECK_EQUAL(channel1, channel1a);
  std::string channel1uri = channel1->getUri().toString();
  BOOST_CHECK_EQUAL(channel1uri.find("unix:///"), 0); // third '/' is the path separator
  BOOST_CHECK_EQUAL(channel1uri.rfind(CHANNEL_PATH1),
                    channel1uri.size() - std::string(CHANNEL_PATH1).size());

  shared_ptr<UnixStreamChannel> channel2 = factory.createChannel(CHANNEL_PATH2);
  BOOST_CHECK_NE(channel1, channel2);
}

BOOST_AUTO_TEST_CASE(GetChannels)
{
  UnixStreamFactory factory;
  BOOST_REQUIRE_EQUAL(factory.getChannels().empty(), true);

  std::vector<shared_ptr<const Channel> > expectedChannels;

  expectedChannels.push_back(factory.createChannel(CHANNEL_PATH1));
  expectedChannels.push_back(factory.createChannel(CHANNEL_PATH2));

  std::list<shared_ptr<const Channel> > channels = factory.getChannels();
  for (std::list<shared_ptr<const Channel> >::const_iterator i = channels.begin();
       i != channels.end(); ++i)
    {
      std::vector<shared_ptr<const Channel> >::iterator pos =
        std::find(expectedChannels.begin(), expectedChannels.end(), *i);

      BOOST_REQUIRE(pos != expectedChannels.end());
      expectedChannels.erase(pos);
    }

  BOOST_CHECK_EQUAL(expectedChannels.size(), 0);
}

class EndToEndFixture : protected BaseFixture
{
public:
  void
  client_onConnect(const boost::system::error_code& error)
  {
    BOOST_CHECK_MESSAGE(!error, error.message());

    limitedIo.afterOp();
  }

  void
  channel1_onFaceCreated(const shared_ptr<Face>& newFace)
  {
    BOOST_CHECK(!static_cast<bool>(face1));
    face1 = static_pointer_cast<UnixStreamFace>(newFace);
    face1->onReceiveInterest.connect(bind(&EndToEndFixture::face1_onReceiveInterest, this, _1));
    face1->onReceiveData.connect(bind(&EndToEndFixture::face1_onReceiveData, this, _1));

    limitedIo.afterOp();
  }

  void
  channel1_onConnectFailed(const std::string& reason)
  {
    BOOST_CHECK_MESSAGE(false, reason);

    limitedIo.afterOp();
  }

  void
  face1_onReceiveInterest(const Interest& interest)
  {
    face1_receivedInterests.push_back(interest);

    limitedIo.afterOp();
  }

  void
  face1_onReceiveData(const Data& data)
  {
    face1_receivedDatas.push_back(data);

    limitedIo.afterOp();
  }

  void
  face2_onReceiveInterest(const Interest& interest)
  {
    face2_receivedInterests.push_back(interest);

    limitedIo.afterOp();
  }

  void
  face2_onReceiveData(const Data& data)
  {
    face2_receivedDatas.push_back(data);

    limitedIo.afterOp();
  }

  void
  channel_onFaceCreated(const shared_ptr<Face>& newFace)
  {
    faces.push_back(static_pointer_cast<UnixStreamFace>(newFace));

    limitedIo.afterOp();
  }

  void
  channel_onConnectFailed(const std::string& reason)
  {
    BOOST_CHECK_MESSAGE(false, reason);

    limitedIo.afterOp();
  }

protected:
  LimitedIo limitedIo;

  shared_ptr<UnixStreamFace> face1;
  std::vector<Interest> face1_receivedInterests;
  std::vector<Data> face1_receivedDatas;
  shared_ptr<UnixStreamFace> face2;
  std::vector<Interest> face2_receivedInterests;
  std::vector<Data> face2_receivedDatas;

  std::list< shared_ptr<UnixStreamFace> > faces;
};


BOOST_FIXTURE_TEST_CASE(EndToEnd, EndToEndFixture)
{
  UnixStreamFactory factory;

  shared_ptr<UnixStreamChannel> channel1 = factory.createChannel(CHANNEL_PATH1);
  channel1->listen(bind(&EndToEndFixture::channel1_onFaceCreated,   this, _1),
                   bind(&EndToEndFixture::channel1_onConnectFailed, this, _1));

  shared_ptr<stream_protocol::socket> client = make_shared<stream_protocol::socket>(ref(g_io));
  client->async_connect(stream_protocol::endpoint(CHANNEL_PATH1),
                        bind(&EndToEndFixture::client_onConnect, this, _1));

  BOOST_CHECK_MESSAGE(limitedIo.run(2, time::seconds(1)) == LimitedIo::EXCEED_OPS,
                      "UnixStreamChannel error: cannot connect or cannot accept connection");

  BOOST_REQUIRE(static_cast<bool>(face1));
  BOOST_CHECK_EQUAL(face1->isLocal(), true);
  BOOST_CHECK_EQUAL(face1->isOnDemand(), true);
  BOOST_CHECK_EQUAL(face1->isMultiAccess(), false);
  BOOST_CHECK_EQUAL(face1->getRemoteUri().getScheme(), "fd");
  BOOST_CHECK_NO_THROW(boost::lexical_cast<int>(face1->getRemoteUri().getHost()));
  std::string face1localUri = face1->getLocalUri().toString();
  BOOST_CHECK_EQUAL(face1localUri.find("unix:///"), 0); // third '/' is the path separator
  BOOST_CHECK_EQUAL(face1localUri.rfind(CHANNEL_PATH1),
                    face1localUri.size() - std::string(CHANNEL_PATH1).size());

  face2 = make_shared<UnixStreamFace>(client);
  face2->onReceiveInterest.connect(bind(&EndToEndFixture::face2_onReceiveInterest, this, _1));
  face2->onReceiveData.connect(bind(&EndToEndFixture::face2_onReceiveData, this, _1));

  shared_ptr<Interest> interest1 = makeInterest("ndn:/TpnzGvW9R");
  shared_ptr<Data>     data1     = makeData("ndn:/KfczhUqVix");
  shared_ptr<Interest> interest2 = makeInterest("ndn:/QWiIMfj5sL");
  shared_ptr<Data>     data2     = makeData("ndn:/XNBV796f");

  face1->sendInterest(*interest1);
  face1->sendInterest(*interest1);
  face1->sendInterest(*interest1);
  face1->sendData    (*data1    );
  size_t nBytesSent1 = interest1->wireEncode().size() * 3 + data1->wireEncode().size();
  face2->sendInterest(*interest2);
  face2->sendData    (*data2    );
  face2->sendData    (*data2    );
  face2->sendData    (*data2    );
  size_t nBytesSent2 = interest2->wireEncode().size() + data2->wireEncode().size() * 3;

  BOOST_CHECK_MESSAGE(limitedIo.run(8, time::seconds(1)) == LimitedIo::EXCEED_OPS,
                      "UnixStreamChannel error: cannot send or receive Interest/Data packets");

  BOOST_REQUIRE_EQUAL(face1_receivedInterests.size(), 1);
  BOOST_REQUIRE_EQUAL(face1_receivedDatas    .size(), 3);
  BOOST_REQUIRE_EQUAL(face2_receivedInterests.size(), 3);
  BOOST_REQUIRE_EQUAL(face2_receivedDatas    .size(), 1);

  BOOST_CHECK_EQUAL(face1_receivedInterests[0].getName(), interest2->getName());
  BOOST_CHECK_EQUAL(face1_receivedDatas    [0].getName(), data2->getName());
  BOOST_CHECK_EQUAL(face2_receivedInterests[0].getName(), interest1->getName());
  BOOST_CHECK_EQUAL(face2_receivedDatas    [0].getName(), data1->getName());

  // needed to ensure NOutBytes counters are accurate
  limitedIo.run(LimitedIo::UNLIMITED_OPS, time::seconds(1));

  const FaceCounters& counters1 = face1->getCounters();
  BOOST_CHECK_EQUAL(counters1.getNInInterests() , 1);
  BOOST_CHECK_EQUAL(counters1.getNInDatas()     , 3);
  BOOST_CHECK_EQUAL(counters1.getNOutInterests(), 3);
  BOOST_CHECK_EQUAL(counters1.getNOutDatas()    , 1);
  BOOST_CHECK_EQUAL(counters1.getNInBytes(), nBytesSent2);
  BOOST_CHECK_EQUAL(counters1.getNOutBytes(), nBytesSent1);

  const FaceCounters& counters2 = face2->getCounters();
  BOOST_CHECK_EQUAL(counters2.getNInInterests() , 3);
  BOOST_CHECK_EQUAL(counters2.getNInDatas()     , 1);
  BOOST_CHECK_EQUAL(counters2.getNOutInterests(), 1);
  BOOST_CHECK_EQUAL(counters2.getNOutDatas()    , 3);
}

BOOST_FIXTURE_TEST_CASE(MultipleAccepts, EndToEndFixture)
{
  UnixStreamFactory factory;

  shared_ptr<UnixStreamChannel> channel = factory.createChannel(CHANNEL_PATH1);
  channel->listen(bind(&EndToEndFixture::channel_onFaceCreated,   this, _1),
                  bind(&EndToEndFixture::channel_onConnectFailed, this, _1));

  shared_ptr<stream_protocol::socket> client1 = make_shared<stream_protocol::socket>(ref(g_io));
  client1->async_connect(stream_protocol::endpoint(CHANNEL_PATH1),
                         bind(&EndToEndFixture::client_onConnect, this, _1));

  BOOST_CHECK_MESSAGE(limitedIo.run(2, time::seconds(1)) == LimitedIo::EXCEED_OPS,
                      "UnixStreamChannel error: cannot connect or cannot accept connection");

  BOOST_CHECK_EQUAL(faces.size(), 1);

  shared_ptr<stream_protocol::socket> client2 = make_shared<stream_protocol::socket>(ref(g_io));
  client2->async_connect(stream_protocol::endpoint(CHANNEL_PATH1),
                         bind(&EndToEndFixture::client_onConnect, this, _1));

  BOOST_CHECK_MESSAGE(limitedIo.run(2, time::seconds(1)) == LimitedIo::EXCEED_OPS,
                      "UnixStreamChannel error: cannot accept multiple connections");

  BOOST_CHECK_EQUAL(faces.size(), 2);

  // now close one of the faces
  faces.front()->close();

  // we should still be able to send/receive with the other one
  face1 = faces.back();
  face1->onReceiveInterest.connect(bind(&EndToEndFixture::face1_onReceiveInterest, this, _1));
  face1->onReceiveData.connect(bind(&EndToEndFixture::face1_onReceiveData, this, _1));

  face2 = make_shared<UnixStreamFace>(client2);
  face2->onReceiveInterest.connect(bind(&EndToEndFixture::face2_onReceiveInterest, this, _1));
  face2->onReceiveData.connect(bind(&EndToEndFixture::face2_onReceiveData, this, _1));

  shared_ptr<Interest> interest1 = makeInterest("ndn:/TpnzGvW9R");
  shared_ptr<Data>     data1     = makeData("ndn:/KfczhUqVix");
  shared_ptr<Interest> interest2 = makeInterest("ndn:/QWiIMfj5sL");
  shared_ptr<Data>     data2     = makeData("ndn:/XNBV796f");

  face1->sendInterest(*interest1);
  face1->sendData    (*data1    );
  face2->sendInterest(*interest2);
  face2->sendData    (*data2    );

  BOOST_CHECK_MESSAGE(limitedIo.run(4, time::seconds(1)) == LimitedIo::EXCEED_OPS,
                      "UnixStreamChannel error: cannot send or receive Interest/Data packets");

  BOOST_REQUIRE_EQUAL(face1_receivedInterests.size(), 1);
  BOOST_REQUIRE_EQUAL(face1_receivedDatas    .size(), 1);
  BOOST_REQUIRE_EQUAL(face2_receivedInterests.size(), 1);
  BOOST_REQUIRE_EQUAL(face2_receivedDatas    .size(), 1);

  BOOST_CHECK_EQUAL(face1_receivedInterests[0].getName(), interest2->getName());
  BOOST_CHECK_EQUAL(face1_receivedDatas    [0].getName(), data2->getName());
  BOOST_CHECK_EQUAL(face2_receivedInterests[0].getName(), interest1->getName());
  BOOST_CHECK_EQUAL(face2_receivedDatas    [0].getName(), data1->getName());
}

static inline void
noOp()
{
}

BOOST_FIXTURE_TEST_CASE(UnixStreamFaceLocalControlHeader, EndToEndFixture)
{
  UnixStreamFactory factory;

  shared_ptr<UnixStreamChannel> channel1 = factory.createChannel(CHANNEL_PATH1);
  channel1->listen(bind(&EndToEndFixture::channel1_onFaceCreated,   this, _1),
                   bind(&EndToEndFixture::channel1_onConnectFailed, this, _1));

  shared_ptr<stream_protocol::socket> client = make_shared<stream_protocol::socket>(ref(g_io));
  client->async_connect(stream_protocol::endpoint(CHANNEL_PATH1),
                        bind(&EndToEndFixture::client_onConnect, this, _1));

  BOOST_CHECK_MESSAGE(limitedIo.run(2, time::seconds(1)) == LimitedIo::EXCEED_OPS,
                      "UnixStreamChannel error: cannot connect or cannot accept connection");

  BOOST_REQUIRE(static_cast<bool>(face1));

  face2 = make_shared<UnixStreamFace>(client);
  face2->onReceiveInterest.connect(bind(&EndToEndFixture::face2_onReceiveInterest, this, _1));
  face2->onReceiveData.connect(bind(&EndToEndFixture::face2_onReceiveData, this, _1));

  shared_ptr<Interest> interest1 = makeInterest("ndn:/TpnzGvW9R");
  shared_ptr<Data>     data1     = makeData("ndn:/KfczhUqVix");

  face1->setLocalControlHeaderFeature(LOCAL_CONTROL_FEATURE_INCOMING_FACE_ID);
  face1->setLocalControlHeaderFeature(LOCAL_CONTROL_FEATURE_NEXT_HOP_FACE_ID);

  BOOST_CHECK(face1->isLocalControlHeaderEnabled(LOCAL_CONTROL_FEATURE_INCOMING_FACE_ID));
  BOOST_CHECK(face1->isLocalControlHeaderEnabled(LOCAL_CONTROL_FEATURE_NEXT_HOP_FACE_ID));

  face2->setLocalControlHeaderFeature(LOCAL_CONTROL_FEATURE_INCOMING_FACE_ID);
  face2->setLocalControlHeaderFeature(LOCAL_CONTROL_FEATURE_NEXT_HOP_FACE_ID);

  BOOST_CHECK(face2->isLocalControlHeaderEnabled(LOCAL_CONTROL_FEATURE_INCOMING_FACE_ID));
  BOOST_CHECK(face2->isLocalControlHeaderEnabled(LOCAL_CONTROL_FEATURE_NEXT_HOP_FACE_ID));

  ////////////////////////////////////////////////////////

  interest1->setIncomingFaceId(11);
  interest1->setNextHopFaceId(111);

  face1->sendInterest(*interest1);

  data1->setIncomingFaceId(22);
  data1->getLocalControlHeader().setNextHopFaceId(222);

  face1->sendData(*data1);

  //

  BOOST_CHECK_MESSAGE(limitedIo.run(2, time::seconds(1)) == LimitedIo::EXCEED_OPS,
                      "UnixStreamChannel error: cannot send or receive Interest/Data packets");

  BOOST_REQUIRE_EQUAL(face2_receivedInterests.size(), 1);
  BOOST_REQUIRE_EQUAL(face2_receivedDatas    .size(), 1);

  // sending allows only IncomingFaceId, receiving allows only NextHopFaceId
  BOOST_CHECK_EQUAL(face2_receivedInterests[0].getLocalControlHeader().hasIncomingFaceId(), false);
  BOOST_CHECK_EQUAL(face2_receivedInterests[0].getLocalControlHeader().hasNextHopFaceId(), false);

  BOOST_CHECK_EQUAL(face2_receivedDatas[0].getLocalControlHeader().hasIncomingFaceId(), false);
  BOOST_CHECK_EQUAL(face2_receivedDatas[0].getLocalControlHeader().hasNextHopFaceId(), false);

  ////////////////////////////////////////////////////////

  using namespace boost::asio;

  std::vector<const_buffer> interestWithHeader;
  Block iHeader  = interest1->getLocalControlHeader().wireEncode(*interest1,
    ndn::nfd::LocalControlHeader::ENCODE_INCOMING_FACE_ID |
    ndn::nfd::LocalControlHeader::ENCODE_NEXT_HOP);
  Block iPayload = interest1->wireEncode();
  interestWithHeader.push_back(buffer(iHeader.wire(),  iHeader.size()));
  interestWithHeader.push_back(buffer(iPayload.wire(), iPayload.size()));

  std::vector<const_buffer> dataWithHeader;
  Block dHeader  = data1->getLocalControlHeader().wireEncode(*data1,
    ndn::nfd::LocalControlHeader::ENCODE_INCOMING_FACE_ID |
    ndn::nfd::LocalControlHeader::ENCODE_NEXT_HOP);
  Block dPayload = data1->wireEncode();
  dataWithHeader.push_back(buffer(dHeader.wire(),  dHeader.size()));
  dataWithHeader.push_back(buffer(dPayload.wire(), dPayload.size()));

  //

  client->async_send(interestWithHeader, bind(&noOp));
  client->async_send(dataWithHeader, bind(&noOp));

  BOOST_CHECK_MESSAGE(limitedIo.run(2, time::seconds(1)) == LimitedIo::EXCEED_OPS,
                      "UnixStreamChannel error: cannot send or receive Interest/Data packets");

  BOOST_REQUIRE_EQUAL(face1_receivedInterests.size(), 1);
  BOOST_REQUIRE_EQUAL(face1_receivedDatas    .size(), 1);

  BOOST_CHECK_EQUAL(face1_receivedInterests[0].getLocalControlHeader().hasIncomingFaceId(), false);
  BOOST_CHECK_EQUAL(face1_receivedInterests[0].getLocalControlHeader().hasNextHopFaceId(), true);
  BOOST_CHECK_EQUAL(face1_receivedInterests[0].getNextHopFaceId(), 111);

  BOOST_CHECK_EQUAL(face1_receivedDatas[0].getLocalControlHeader().hasIncomingFaceId(), false);
  BOOST_CHECK_EQUAL(face1_receivedDatas[0].getLocalControlHeader().hasNextHopFaceId(), false);
}


class SimpleEndToEndFixture : protected BaseFixture
{
public:
  void
  onFaceCreated(const shared_ptr<Face>& face)
  {
    face->onReceiveInterest.connect(bind(&SimpleEndToEndFixture::onReceiveInterest, this, _1));
    face->onReceiveData.connect(bind(&SimpleEndToEndFixture::onReceiveData, this, _1));
    face->onFail.connect(bind(&SimpleEndToEndFixture::onFail, this, face));

    if (static_cast<bool>(dynamic_pointer_cast<LocalFace>(face))) {
      static_pointer_cast<LocalFace>(face)->setLocalControlHeaderFeature(
        LOCAL_CONTROL_FEATURE_INCOMING_FACE_ID);

      static_pointer_cast<LocalFace>(face)->setLocalControlHeaderFeature(
        LOCAL_CONTROL_FEATURE_NEXT_HOP_FACE_ID);
    }

    limitedIo.afterOp();
  }

  void
  onConnectFailed(const std::string& reason)
  {
    BOOST_CHECK_MESSAGE(false, reason);

    limitedIo.afterOp();
  }

  void
  onReceiveInterest(const Interest& interest)
  {
    receivedInterests.push_back(interest);

    limitedIo.afterOp();
  }

  void
  onReceiveData(const Data& data)
  {
    receivedDatas.push_back(data);

    limitedIo.afterOp();
  }

  void
  onFail(const shared_ptr<Face>& face)
  {
    limitedIo.afterOp();
  }

public:
  LimitedIo limitedIo;

  std::vector<Interest> receivedInterests;
  std::vector<Data> receivedDatas;
};


BOOST_FIXTURE_TEST_CASE_TEMPLATE(CorruptedInput, Dataset,
                                 CorruptedPackets, SimpleEndToEndFixture)
{
  UnixStreamFactory factory;

  shared_ptr<UnixStreamChannel> channel = factory.createChannel(CHANNEL_PATH1);
  channel->listen(bind(&SimpleEndToEndFixture::onFaceCreated,   this, _1),
                  bind(&SimpleEndToEndFixture::onConnectFailed, this, _1));

  DummyStreamSender<stream_protocol, Dataset> sender;
  sender.start(stream_protocol::endpoint(CHANNEL_PATH1));

  BOOST_CHECK_MESSAGE(limitedIo.run(LimitedIo::UNLIMITED_OPS,
                                    time::seconds(1)) == LimitedIo::EXCEED_TIME,
                      "Exception thrown for " + Dataset::getName());
}


BOOST_AUTO_TEST_SUITE_END()

} // namespace tests
} // namespace nfd