/*
 * libjingle
 * Copyright 2011, Google Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  1. Redistributions of source code must retain the above copyright notice,
 *     this list of conditions and the following disclaimer.
 *  2. 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.
 *  3. The name of the author may not be used to endorse or promote products
 *     derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 */

#include "talk/app/webrtc/webrtcsession.h"
#include "talk/base/thread.h"
#include "talk/base/gunit.h"
#include "talk/session/phone/fakedevicemanager.h"
#include "talk/session/phone/fakemediaengine.h"
#include "talk/p2p/client/fakeportallocator.h"
#include "talk/session/phone/channelmanager.h"
#include "talk/session/phone/mediasession.h"

static const char kStream1[] = "stream1";
static const char kVideoTrack1[] = "video1";
static const char kAudioTrack1[] = "audio1";

static const char kStream2[] = "stream2";
static const char kVideoTrack2[] = "video2";
static const char kAudioTrack2[] = "audio2";


class MockWebRtcSessionObserver : public webrtc::WebRtcSessionObserver {
 public:
  virtual void OnCandidatesReady(
      const std::vector<cricket::Candidate>& candidates) {
    for (cricket::Candidates::const_iterator iter = candidates.begin();
         iter != candidates.end(); ++iter) {
      candidates_.push_back(*iter);
    }
  }
  std::vector<cricket::Candidate> candidates_;
};

class WebRtcSessionForTest : public webrtc::WebRtcSession {
 public:
  WebRtcSessionForTest(cricket::ChannelManager* cmgr,
                       talk_base::Thread* signaling_thread,
                       talk_base::Thread* worker_thread,
                       cricket::PortAllocator* port_allocator)
    : WebRtcSession(cmgr, signaling_thread, worker_thread, port_allocator) {
  }
  virtual ~WebRtcSessionForTest() {}

  using webrtc::WebRtcSession::CreateOffer;
  using webrtc::WebRtcSession::CreateAnswer;
  using webrtc::WebRtcSession::SetLocalDescription;
  using webrtc::WebRtcSession::SetRemoteDescription;
  using webrtc::WebRtcSession::SetRemoteCandidates;
};

class WebRtcSessionTest : public testing::Test {
 protected:
  virtual void SetUp() {
    cricket::FakeMediaEngine* media_engine(new cricket::FakeMediaEngine());
    cricket::FakeDeviceManager* device_manager(
        new cricket::FakeDeviceManager());

    channel_manager_.reset(new cricket::ChannelManager(
        media_engine, device_manager, talk_base::Thread::Current()));
    port_allocator_.reset(new cricket::FakePortAllocator(
        talk_base::Thread::Current(), NULL));
    desc_factory_.reset(
        new cricket::MediaSessionDescriptionFactory(channel_manager_.get()));

    ASSERT_TRUE(channel_manager_.get() != NULL);
    ASSERT_TRUE(session_.get() == NULL);
    ASSERT_TRUE(channel_manager_.get()->Init());

    session_.reset(new WebRtcSessionForTest(
        channel_manager_.get(), talk_base::Thread::Current(),
        talk_base::Thread::Current(), port_allocator_.get()));
    session_->RegisterObserver(&observer_);

    EXPECT_TRUE(session_->Initialize());

    video_channel_ = media_engine->GetVideoChannel(0);
    voice_channel_ = media_engine->GetVoiceChannel(0);
  }

  void PopulateFakeCandidates() {
    const int num_of_channels = 4;
    const char* const channel_names[num_of_channels] = {
        "rtp", "rtcp", "video_rtp", "video_rtcp"
    };

    // max 4 transport channels;
    candidates_.clear();
    for (int i = 0; i < num_of_channels; ++i) {
      cricket::Candidate candidate;
      candidate.set_name(channel_names[i]);
      candidates_.push_back(candidate);
    }
  }

  // Create a session description based on options. Used for testing but don't
  // test WebRtcSession.
  cricket::SessionDescription* CreateTestOffer(
      const cricket::MediaSessionOptions& options) {
    desc_factory_->set_secure(cricket::SEC_REQUIRED);
    return desc_factory_->CreateOffer(options, NULL);
  }

  // Create a session description based on options. Used for testing but don't
  // test WebRtcSession.
  cricket::SessionDescription* CreateTestAnswer(
      const cricket::SessionDescription* offer,
      const cricket::MediaSessionOptions& options) {
    desc_factory_->set_secure(cricket::SEC_REQUIRED);
    return desc_factory_->CreateAnswer(offer, options, NULL);
  }

  cricket::MediaSessionOptions OptionsWithStream1() {
    cricket::MediaSessionOptions options;
    options.AddStream(cricket::MEDIA_TYPE_VIDEO, kVideoTrack1, kStream1);
    options.AddStream(cricket::MEDIA_TYPE_AUDIO, kAudioTrack1, kStream1);
    return options;
  }

  cricket::MediaSessionOptions OptionsWithStream2() {
    cricket::MediaSessionOptions options;
    options.AddStream(cricket::MEDIA_TYPE_VIDEO, kVideoTrack2, kStream2);
    options.AddStream(cricket::MEDIA_TYPE_AUDIO, kAudioTrack2, kStream2);
    return options;
  }

  cricket::MediaSessionOptions OptionsWithStream1And2() {
    cricket::MediaSessionOptions options;
    options.AddStream(cricket::MEDIA_TYPE_VIDEO, kVideoTrack1, kStream1);
    options.AddStream(cricket::MEDIA_TYPE_AUDIO, kAudioTrack1, kStream1);
    options.AddStream(cricket::MEDIA_TYPE_VIDEO, kVideoTrack2, kStream2);
    options.AddStream(cricket::MEDIA_TYPE_AUDIO, kAudioTrack2, kStream2);
    return options;
  }

  cricket::MediaSessionOptions OptionsReceiveOnly() {
    cricket::MediaSessionOptions options;
    options.has_video = true;
    return options;
  }

  bool ChannelsExist() {
    return (session_->voice_channel() != NULL &&
            session_->video_channel() != NULL);
  }

  void CheckTransportChannels() {
    EXPECT_TRUE(session_->GetChannel(cricket::CN_AUDIO, "rtp") != NULL);
    EXPECT_TRUE(session_->GetChannel(cricket::CN_AUDIO, "rtcp") != NULL);
    EXPECT_TRUE(session_->GetChannel(cricket::CN_VIDEO, "video_rtp") != NULL);
    EXPECT_TRUE(session_->GetChannel(cricket::CN_VIDEO, "video_rtcp") != NULL);
  }

  void VerifyCryptoParams(const cricket::SessionDescription* sdp,
                          bool offer) {
    ASSERT_TRUE(session_.get() != NULL);
    const cricket::ContentInfo* content = cricket::GetFirstAudioContent(sdp);
    ASSERT_TRUE(content != NULL);
    const cricket::AudioContentDescription* audio_content =
        static_cast<const cricket::AudioContentDescription*>(
            content->description);
    ASSERT_TRUE(audio_content != NULL);
    if (offer) {
      ASSERT_EQ(2U, audio_content->cryptos().size());
      // key(40) + inline string
      ASSERT_EQ(47U, audio_content->cryptos()[0].key_params.size());
      ASSERT_EQ("AES_CM_128_HMAC_SHA1_32",
                audio_content->cryptos()[0].cipher_suite);
      ASSERT_EQ("AES_CM_128_HMAC_SHA1_80",
                audio_content->cryptos()[1].cipher_suite);
      ASSERT_EQ(47U, audio_content->cryptos()[1].key_params.size());
    } else {
      ASSERT_EQ(1U, audio_content->cryptos().size());
      // key(40) + inline string
      ASSERT_EQ(47U, audio_content->cryptos()[0].key_params.size());
      ASSERT_EQ("AES_CM_128_HMAC_SHA1_32",
                audio_content->cryptos()[0].cipher_suite);
    }

    content = cricket::GetFirstVideoContent(sdp);
    ASSERT_TRUE(content != NULL);
    const cricket::VideoContentDescription* video_content =
        static_cast<const cricket::VideoContentDescription*>(
            content->description);
    ASSERT_TRUE(video_content != NULL);
    ASSERT_EQ(1U, video_content->cryptos().size());
    ASSERT_EQ("AES_CM_128_HMAC_SHA1_80",
              video_content->cryptos()[0].cipher_suite);
    ASSERT_EQ(47U, video_content->cryptos()[0].key_params.size());
  }

  void VerifyNoCryptoParams(const cricket::SessionDescription* sdp) {
    const cricket::ContentInfo* content = cricket::GetFirstAudioContent(sdp);
    ASSERT_TRUE(content != NULL);
    const cricket::AudioContentDescription* audio_content =
        static_cast<const cricket::AudioContentDescription*>(
            content->description);
    ASSERT_TRUE(audio_content != NULL);
    ASSERT_EQ(0U, audio_content->cryptos().size());

    content = cricket::GetFirstVideoContent(sdp);
    ASSERT_TRUE(content != NULL);
    const cricket::VideoContentDescription* video_content =
        static_cast<const cricket::VideoContentDescription*>(
            content->description);
    ASSERT_TRUE(video_content != NULL);
    ASSERT_EQ(0U, video_content->cryptos().size());
  }

  void VerifyAnswerFromNonCryptoOffer() {
    // Create a SDP without Crypto.
    desc_factory_->set_secure(cricket::SEC_DISABLED);
    cricket::MediaSessionOptions options;
    options.has_video = true;
    cricket::SessionDescription* offer =
        desc_factory_->CreateOffer(options, NULL);
    ASSERT_TRUE(offer != NULL);
    VerifyNoCryptoParams(offer);
    const cricket::SessionDescription* answer =
        session_->CreateAnswer(offer, options);
    // Answer should be NULL as no crypto params in offer.
    ASSERT_TRUE(answer == NULL);
  }

  void VerifyAnswerFromCryptoOffer() {
    desc_factory_->set_secure(cricket::SEC_REQUIRED);
    cricket::MediaSessionOptions options;
    options.has_video = true;
    cricket::SessionDescription* offer =
        desc_factory_->CreateOffer(options, NULL);
    ASSERT_TRUE(offer != NULL);
    VerifyCryptoParams(offer, true);
    const cricket::SessionDescription* answer =
        session_->CreateAnswer(offer, options);
    ASSERT_TRUE(answer != NULL);
    VerifyCryptoParams(answer, false);
  }

  talk_base::scoped_ptr<cricket::PortAllocator> port_allocator_;
  talk_base::scoped_ptr<cricket::ChannelManager> channel_manager_;
  talk_base::scoped_ptr<cricket::MediaSessionDescriptionFactory> desc_factory_;
  talk_base::scoped_ptr<WebRtcSessionForTest> session_;
  MockWebRtcSessionObserver observer_;
  std::vector<cricket::Candidate> candidates_;
  cricket::FakeVideoMediaChannel* video_channel_;
  cricket::FakeVoiceMediaChannel* voice_channel_;
};

TEST_F(WebRtcSessionTest, TestInitialize) {
  EXPECT_TRUE(ChannelsExist());
  CheckTransportChannels();
  talk_base::Thread::Current()->ProcessMessages(1000);
  EXPECT_EQ(4u, observer_.candidates_.size());
}

// Test creating offers and receive answers and make sure the
// media engine creates the expected send and receive streams.
TEST_F(WebRtcSessionTest, TestCreateOfferReceiveAnswer) {
  cricket::MediaSessionOptions options = OptionsWithStream1();
  cricket::SessionDescription* offer = session_->CreateOffer(options);

  cricket::MediaSessionOptions options2 = OptionsWithStream2();
  cricket::SessionDescription* answer =  CreateTestAnswer(offer, options2);

  session_->SetLocalDescription(offer, cricket::CA_OFFER);
  session_->SetRemoteDescription(answer, cricket::CA_ANSWER);

  ASSERT_EQ(1u, video_channel_->recv_streams().size());
  cricket::StreamParams recv_video_stream =
      video_channel_->recv_streams()[0];
  EXPECT_TRUE(kVideoTrack2 == recv_video_stream.name);

  ASSERT_EQ(1u, voice_channel_->recv_streams().size());
  cricket::StreamParams recv_audio_stream =
      voice_channel_->recv_streams()[0];
  EXPECT_TRUE(kAudioTrack2 == recv_audio_stream.name);

  ASSERT_EQ(1u, video_channel_->send_streams().size());
  EXPECT_TRUE(kVideoTrack1 == video_channel_->send_streams()[0].name);
  ASSERT_EQ(1u, voice_channel_->send_streams().size());
  EXPECT_TRUE(kAudioTrack1 == voice_channel_->send_streams()[0].name);

  // Create new offer without send streams.
  offer = session_->CreateOffer(OptionsReceiveOnly());
  // Test with same answer.
  session_->SetLocalDescription(offer, cricket::CA_OFFER);
  session_->SetRemoteDescription(answer, cricket::CA_ANSWER);

  EXPECT_EQ(0u, video_channel_->send_streams().size());
  EXPECT_EQ(0u, voice_channel_->send_streams().size());

  // Make sure the receive streams have not changed.
  ASSERT_EQ(1u, video_channel_->recv_streams().size());
  EXPECT_EQ(recv_video_stream, video_channel_->recv_streams()[0]);
  ASSERT_EQ(1u, voice_channel_->recv_streams().size());
  EXPECT_EQ(recv_audio_stream, voice_channel_->recv_streams()[0]);
}

// Test receiving offers and creating answers and make sure the
// media engine creates the expected send and receive streams.
TEST_F(WebRtcSessionTest, TestReceiveOfferCreateAnswer) {
  cricket::SessionDescription* offer = CreateTestOffer(OptionsWithStream2());

  cricket::MediaSessionOptions answer_options = OptionsWithStream1();
  cricket::SessionDescription* answer =
        session_->CreateAnswer(offer, answer_options);
  session_->SetRemoteDescription(offer, cricket::CA_OFFER);
  session_->SetLocalDescription(answer, cricket::CA_ANSWER);

  ASSERT_EQ(1u, video_channel_->recv_streams().size());
  EXPECT_TRUE(kVideoTrack2 == video_channel_->recv_streams()[0].name);

  ASSERT_EQ(1u, voice_channel_->recv_streams().size());
  EXPECT_TRUE(kAudioTrack2 == voice_channel_->recv_streams()[0].name);

  ASSERT_EQ(1u, video_channel_->send_streams().size());
  EXPECT_TRUE(kVideoTrack1 == video_channel_->send_streams()[0].name);
  ASSERT_EQ(1u, voice_channel_->send_streams().size());
  EXPECT_TRUE(kAudioTrack1 == voice_channel_->send_streams()[0].name);

  offer = CreateTestOffer(OptionsWithStream1And2());

  // Answer by turning off all send streams.
  answer = session_->CreateAnswer(offer, OptionsReceiveOnly());
  session_->SetRemoteDescription(offer, cricket::CA_OFFER);
  session_->SetLocalDescription(answer, cricket::CA_ANSWER);

  ASSERT_EQ(2u, video_channel_->recv_streams().size());
  EXPECT_TRUE(kVideoTrack1 == video_channel_->recv_streams()[0].name);
  EXPECT_TRUE(kVideoTrack2 == video_channel_->recv_streams()[1].name);
  ASSERT_EQ(2u, voice_channel_->recv_streams().size());
  EXPECT_TRUE(kAudioTrack1 == voice_channel_->recv_streams()[0].name);
  EXPECT_TRUE(kAudioTrack2 == voice_channel_->recv_streams()[1].name);

  // Make we have no send streams.
  EXPECT_EQ(0u, video_channel_->send_streams().size());
  EXPECT_EQ(0u, voice_channel_->send_streams().size());
}

TEST_F(WebRtcSessionTest, TestDefaultSetSecurePolicy) {
  EXPECT_EQ(cricket::SEC_REQUIRED, session_->secure_policy());
}

TEST_F(WebRtcSessionTest, VerifyCryptoParamsInSDP) {
  VerifyCryptoParams(session_->CreateOffer(OptionsWithStream1()), true);
}

TEST_F(WebRtcSessionTest, VerifyNoCryptoParamsInSDP) {
  session_->set_secure_policy(cricket::SEC_DISABLED);
  VerifyNoCryptoParams(session_->CreateOffer(OptionsWithStream1()));
}

TEST_F(WebRtcSessionTest, VerifyAnswerFromNonCryptoOffer) {
  VerifyAnswerFromNonCryptoOffer();
}

TEST_F(WebRtcSessionTest, VerifyAnswerFromCryptoOffer) {
  VerifyAnswerFromCryptoOffer();
}