/*
 *  Copyright 2008 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#include <memory>

#include "absl/memory/memory.h"
#include "api/rtc_error.h"
#include "api/test/fake_media_transport.h"
#include "media/base/fake_media_engine.h"
#include "media/base/test_utils.h"
#include "media/engine/fake_webrtc_call.h"
#include "p2p/base/dtls_transport_internal.h"
#include "p2p/base/fake_dtls_transport.h"
#include "p2p/base/p2p_constants.h"
#include "p2p/base/packet_transport_internal.h"
#include "pc/channel_manager.h"
#include "pc/dtls_srtp_transport.h"
#include "rtc_base/checks.h"
#include "rtc_base/thread.h"
#include "test/gtest.h"

namespace {
const bool kDefaultSrtpRequired = true;
}

namespace cricket {

static const AudioCodec kAudioCodecs[] = {
    AudioCodec(97, "voice", 1, 2, 3), AudioCodec(111, "OPUS", 48000, 32000, 2),
};

static const VideoCodec kVideoCodecs[] = {
    VideoCodec(99, "H264"), VideoCodec(100, "VP8"), VideoCodec(96, "rtx"),
};

class ChannelManagerTest : public testing::Test {
 protected:
  ChannelManagerTest()
      : network_(rtc::Thread::CreateWithSocketServer()),
        worker_(rtc::Thread::Create()),
        fme_(new cricket::FakeMediaEngine()),
        fdme_(new cricket::FakeDataEngine()),
        cm_(new cricket::ChannelManager(
            std::unique_ptr<MediaEngineInterface>(fme_),
            std::unique_ptr<DataEngineInterface>(fdme_),
            rtc::Thread::Current(),
            rtc::Thread::Current())),
        fake_call_() {
    fme_->SetAudioCodecs(MAKE_VECTOR(kAudioCodecs));
    fme_->SetVideoCodecs(MAKE_VECTOR(kVideoCodecs));
  }

  std::unique_ptr<webrtc::RtpTransportInternal> CreateDtlsSrtpTransport() {
    rtp_dtls_transport_ = absl::make_unique<FakeDtlsTransport>(
        "fake_dtls_transport", cricket::ICE_CANDIDATE_COMPONENT_RTP);
    auto dtls_srtp_transport = absl::make_unique<webrtc::DtlsSrtpTransport>(
        /*rtcp_mux_required=*/true);
    dtls_srtp_transport->SetDtlsTransports(rtp_dtls_transport_.get(),
                                           /*rtcp_dtls_transport=*/nullptr);
    return dtls_srtp_transport;
  }

  std::unique_ptr<webrtc::MediaTransportInterface> CreateMediaTransport(
      rtc::PacketTransportInternal* packet_transport) {
    auto media_transport_result =
        fake_media_transport_factory_.CreateMediaTransport(packet_transport,
                                                           network_.get(),
                                                           /*is_caller=*/true);
    RTC_CHECK(media_transport_result.ok());
    return media_transport_result.MoveValue();
  }

  void TestCreateDestroyChannels(
      webrtc::RtpTransportInternal* rtp_transport,
      webrtc::MediaTransportInterface* media_transport) {
    cricket::VoiceChannel* voice_channel = cm_->CreateVoiceChannel(
        &fake_call_, cricket::MediaConfig(), rtp_transport, media_transport,
        rtc::Thread::Current(), cricket::CN_AUDIO, kDefaultSrtpRequired,
        webrtc::CryptoOptions(), &ssrc_generator_, AudioOptions());
    EXPECT_TRUE(voice_channel != nullptr);
    cricket::VideoChannel* video_channel = cm_->CreateVideoChannel(
        &fake_call_, cricket::MediaConfig(), rtp_transport, media_transport,
        rtc::Thread::Current(), cricket::CN_VIDEO, kDefaultSrtpRequired,
        webrtc::CryptoOptions(), &ssrc_generator_, VideoOptions());
    EXPECT_TRUE(video_channel != nullptr);
    cricket::RtpDataChannel* rtp_data_channel = cm_->CreateRtpDataChannel(
        cricket::MediaConfig(), rtp_transport, rtc::Thread::Current(),
        cricket::CN_DATA, kDefaultSrtpRequired, webrtc::CryptoOptions(),
        &ssrc_generator_);
    EXPECT_TRUE(rtp_data_channel != nullptr);
    cm_->DestroyVideoChannel(video_channel);
    cm_->DestroyVoiceChannel(voice_channel);
    cm_->DestroyRtpDataChannel(rtp_data_channel);
    cm_->Terminate();
  }

  std::unique_ptr<DtlsTransportInternal> rtp_dtls_transport_;
  std::unique_ptr<rtc::Thread> network_;
  std::unique_ptr<rtc::Thread> worker_;
  // |fme_| and |fdme_| are actually owned by |cm_|.
  cricket::FakeMediaEngine* fme_;
  cricket::FakeDataEngine* fdme_;
  std::unique_ptr<cricket::ChannelManager> cm_;
  cricket::FakeCall fake_call_;
  webrtc::FakeMediaTransportFactory fake_media_transport_factory_;
  rtc::UniqueRandomIdGenerator ssrc_generator_;
};

// Test that we startup/shutdown properly.
TEST_F(ChannelManagerTest, StartupShutdown) {
  EXPECT_FALSE(cm_->initialized());
  EXPECT_EQ(rtc::Thread::Current(), cm_->worker_thread());
  EXPECT_TRUE(cm_->Init());
  EXPECT_TRUE(cm_->initialized());
  cm_->Terminate();
  EXPECT_FALSE(cm_->initialized());
}

// Test that we startup/shutdown properly with a worker thread.
TEST_F(ChannelManagerTest, StartupShutdownOnThread) {
  network_->Start();
  worker_->Start();
  EXPECT_FALSE(cm_->initialized());
  EXPECT_EQ(rtc::Thread::Current(), cm_->worker_thread());
  EXPECT_TRUE(cm_->set_network_thread(network_.get()));
  EXPECT_EQ(network_.get(), cm_->network_thread());
  EXPECT_TRUE(cm_->set_worker_thread(worker_.get()));
  EXPECT_EQ(worker_.get(), cm_->worker_thread());
  EXPECT_TRUE(cm_->Init());
  EXPECT_TRUE(cm_->initialized());
  // Setting the network or worker thread while initialized should fail.
  EXPECT_FALSE(cm_->set_network_thread(rtc::Thread::Current()));
  EXPECT_FALSE(cm_->set_worker_thread(rtc::Thread::Current()));
  cm_->Terminate();
  EXPECT_FALSE(cm_->initialized());
}

TEST_F(ChannelManagerTest, SetVideoRtxEnabled) {
  std::vector<VideoCodec> codecs;
  const VideoCodec rtx_codec(96, "rtx");

  // By default RTX is disabled.
  cm_->GetSupportedVideoCodecs(&codecs);
  EXPECT_FALSE(ContainsMatchingCodec(codecs, rtx_codec));

  // Enable and check.
  EXPECT_TRUE(cm_->SetVideoRtxEnabled(true));
  cm_->GetSupportedVideoCodecs(&codecs);
  EXPECT_TRUE(ContainsMatchingCodec(codecs, rtx_codec));

  // Disable and check.
  EXPECT_TRUE(cm_->SetVideoRtxEnabled(false));
  cm_->GetSupportedVideoCodecs(&codecs);
  EXPECT_FALSE(ContainsMatchingCodec(codecs, rtx_codec));

  // Cannot toggle rtx after initialization.
  EXPECT_TRUE(cm_->Init());
  EXPECT_FALSE(cm_->SetVideoRtxEnabled(true));
  EXPECT_FALSE(cm_->SetVideoRtxEnabled(false));

  // Can set again after terminate.
  cm_->Terminate();
  EXPECT_TRUE(cm_->SetVideoRtxEnabled(true));
  cm_->GetSupportedVideoCodecs(&codecs);
  EXPECT_TRUE(ContainsMatchingCodec(codecs, rtx_codec));
}

TEST_F(ChannelManagerTest, CreateDestroyChannels) {
  EXPECT_TRUE(cm_->Init());
  auto rtp_transport = CreateDtlsSrtpTransport();
  TestCreateDestroyChannels(rtp_transport.get(), /*media_transport=*/nullptr);
}

TEST_F(ChannelManagerTest, CreateDestroyChannelsWithMediaTransport) {
  EXPECT_TRUE(cm_->Init());
  auto rtp_transport = CreateDtlsSrtpTransport();
  auto media_transport =
      CreateMediaTransport(rtp_transport->rtcp_packet_transport());
  TestCreateDestroyChannels(rtp_transport.get(), media_transport.get());
}

TEST_F(ChannelManagerTest, CreateDestroyChannelsOnThread) {
  network_->Start();
  worker_->Start();
  EXPECT_TRUE(cm_->set_worker_thread(worker_.get()));
  EXPECT_TRUE(cm_->set_network_thread(network_.get()));
  EXPECT_TRUE(cm_->Init());
  auto rtp_transport = CreateDtlsSrtpTransport();
  TestCreateDestroyChannels(rtp_transport.get(), /*media_transport=*/nullptr);
}

}  // namespace cricket