/*
 *  Copyright (c) 2020 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 "audio/voip/voip_core.h"
#include "api/audio_codecs/builtin_audio_decoder_factory.h"
#include "api/audio_codecs/builtin_audio_encoder_factory.h"
#include "api/task_queue/default_task_queue_factory.h"
#include "modules/audio_device/include/mock_audio_device.h"
#include "modules/audio_processing/include/mock_audio_processing.h"
#include "modules/utility/include/mock/mock_process_thread.h"
#include "test/gtest.h"
#include "test/mock_transport.h"

namespace webrtc {
namespace {

using ::testing::NiceMock;
using ::testing::Return;

constexpr int kPcmuPayload = 0;
constexpr int kPcmuSampleRateHz = 8000;
constexpr int kDtmfEventDurationMs = 1000;
constexpr DtmfEvent kDtmfEventCode = DtmfEvent::kDigitZero;

class VoipCoreTest : public ::testing::Test {
 public:
  const SdpAudioFormat kPcmuFormat = {"pcmu", 8000, 1};

  VoipCoreTest() { audio_device_ = test::MockAudioDeviceModule::CreateNice(); }

  void SetUp() override {
    auto encoder_factory = CreateBuiltinAudioEncoderFactory();
    auto decoder_factory = CreateBuiltinAudioDecoderFactory();
    rtc::scoped_refptr<AudioProcessing> audio_processing =
        new rtc::RefCountedObject<NiceMock<test::MockAudioProcessing>>();

    auto process_thread = std::make_unique<NiceMock<MockProcessThread>>();
    // Hold the pointer to use for testing.
    process_thread_ = process_thread.get();

    voip_core_ = std::make_unique<VoipCore>(
        std::move(encoder_factory), std::move(decoder_factory),
        CreateDefaultTaskQueueFactory(), audio_device_,
        std::move(audio_processing), std::move(process_thread));
  }

  std::unique_ptr<VoipCore> voip_core_;
  NiceMock<MockTransport> transport_;
  rtc::scoped_refptr<test::MockAudioDeviceModule> audio_device_;
  NiceMock<MockProcessThread>* process_thread_;
};

// Validate expected API calls that involves with VoipCore. Some verification is
// involved with checking mock audio device.
TEST_F(VoipCoreTest, BasicVoipCoreOperation) {
  // Program mock as non-operational and ready to start.
  EXPECT_CALL(*audio_device_, Recording()).WillOnce(Return(false));
  EXPECT_CALL(*audio_device_, Playing()).WillOnce(Return(false));
  EXPECT_CALL(*audio_device_, InitRecording()).WillOnce(Return(0));
  EXPECT_CALL(*audio_device_, InitPlayout()).WillOnce(Return(0));
  EXPECT_CALL(*audio_device_, StartRecording()).WillOnce(Return(0));
  EXPECT_CALL(*audio_device_, StartPlayout()).WillOnce(Return(0));

  auto channel = voip_core_->CreateChannel(&transport_, 0xdeadc0de);

  EXPECT_EQ(voip_core_->SetSendCodec(channel, kPcmuPayload, kPcmuFormat),
            VoipResult::kOk);
  EXPECT_EQ(
      voip_core_->SetReceiveCodecs(channel, {{kPcmuPayload, kPcmuFormat}}),
      VoipResult::kOk);

  EXPECT_EQ(voip_core_->StartSend(channel), VoipResult::kOk);
  EXPECT_EQ(voip_core_->StartPlayout(channel), VoipResult::kOk);

  EXPECT_EQ(voip_core_->RegisterTelephoneEventType(channel, kPcmuPayload,
                                                   kPcmuSampleRateHz),
            VoipResult::kOk);

  EXPECT_EQ(
      voip_core_->SendDtmfEvent(channel, kDtmfEventCode, kDtmfEventDurationMs),
      VoipResult::kOk);

  // Program mock as operational that is ready to be stopped.
  EXPECT_CALL(*audio_device_, Recording()).WillOnce(Return(true));
  EXPECT_CALL(*audio_device_, Playing()).WillOnce(Return(true));
  EXPECT_CALL(*audio_device_, StopRecording()).WillOnce(Return(0));
  EXPECT_CALL(*audio_device_, StopPlayout()).WillOnce(Return(0));

  EXPECT_EQ(voip_core_->StopSend(channel), VoipResult::kOk);
  EXPECT_EQ(voip_core_->StopPlayout(channel), VoipResult::kOk);
  EXPECT_EQ(voip_core_->ReleaseChannel(channel), VoipResult::kOk);
}

TEST_F(VoipCoreTest, ExpectFailToUseReleasedChannelId) {
  auto channel = voip_core_->CreateChannel(&transport_, 0xdeadc0de);

  // Release right after creation.
  EXPECT_EQ(voip_core_->ReleaseChannel(channel), VoipResult::kOk);

  // Now use released channel.

  EXPECT_EQ(voip_core_->SetSendCodec(channel, kPcmuPayload, kPcmuFormat),
            VoipResult::kInvalidArgument);
  EXPECT_EQ(
      voip_core_->SetReceiveCodecs(channel, {{kPcmuPayload, kPcmuFormat}}),
      VoipResult::kInvalidArgument);
  EXPECT_EQ(voip_core_->RegisterTelephoneEventType(channel, kPcmuPayload,
                                                   kPcmuSampleRateHz),
            VoipResult::kInvalidArgument);
  EXPECT_EQ(voip_core_->StartSend(channel), VoipResult::kInvalidArgument);
  EXPECT_EQ(voip_core_->StartPlayout(channel), VoipResult::kInvalidArgument);
  EXPECT_EQ(
      voip_core_->SendDtmfEvent(channel, kDtmfEventCode, kDtmfEventDurationMs),
      VoipResult::kInvalidArgument);
}

TEST_F(VoipCoreTest, SendDtmfEventWithoutRegistering) {
  // Program mock as non-operational and ready to start send.
  EXPECT_CALL(*audio_device_, Recording()).WillOnce(Return(false));
  EXPECT_CALL(*audio_device_, InitRecording()).WillOnce(Return(0));
  EXPECT_CALL(*audio_device_, StartRecording()).WillOnce(Return(0));

  auto channel = voip_core_->CreateChannel(&transport_, 0xdeadc0de);

  EXPECT_EQ(voip_core_->SetSendCodec(channel, kPcmuPayload, kPcmuFormat),
            VoipResult::kOk);

  EXPECT_EQ(voip_core_->StartSend(channel), VoipResult::kOk);
  // Send Dtmf event without registering beforehand, thus payload
  // type is not set and kFailedPrecondition is expected.
  EXPECT_EQ(
      voip_core_->SendDtmfEvent(channel, kDtmfEventCode, kDtmfEventDurationMs),
      VoipResult::kFailedPrecondition);

  // Program mock as sending and is ready to be stopped.
  EXPECT_CALL(*audio_device_, Recording()).WillOnce(Return(true));
  EXPECT_CALL(*audio_device_, StopRecording()).WillOnce(Return(0));

  EXPECT_EQ(voip_core_->StopSend(channel), VoipResult::kOk);
  EXPECT_EQ(voip_core_->ReleaseChannel(channel), VoipResult::kOk);
}

TEST_F(VoipCoreTest, SendDtmfEventWithoutStartSend) {
  auto channel = voip_core_->CreateChannel(&transport_, 0xdeadc0de);

  EXPECT_EQ(voip_core_->RegisterTelephoneEventType(channel, kPcmuPayload,
                                                   kPcmuSampleRateHz),
            VoipResult::kOk);

  // Send Dtmf event without calling StartSend beforehand, thus
  // Dtmf events cannot be sent and kFailedPrecondition is expected.
  EXPECT_EQ(
      voip_core_->SendDtmfEvent(channel, kDtmfEventCode, kDtmfEventDurationMs),
      VoipResult::kFailedPrecondition);

  EXPECT_EQ(voip_core_->ReleaseChannel(channel), VoipResult::kOk);
}

TEST_F(VoipCoreTest, StartSendAndPlayoutWithoutSettingCodec) {
  auto channel = voip_core_->CreateChannel(&transport_, 0xdeadc0de);

  // Call StartSend and StartPlayout without setting send/receive
  // codec. Code should see that codecs aren't set and return false.
  EXPECT_EQ(voip_core_->StartSend(channel), VoipResult::kFailedPrecondition);
  EXPECT_EQ(voip_core_->StartPlayout(channel), VoipResult::kFailedPrecondition);

  EXPECT_EQ(voip_core_->ReleaseChannel(channel), VoipResult::kOk);
}

TEST_F(VoipCoreTest, StopSendAndPlayoutWithoutStarting) {
  auto channel = voip_core_->CreateChannel(&transport_, 0xdeadc0de);

  EXPECT_EQ(voip_core_->SetSendCodec(channel, kPcmuPayload, kPcmuFormat),
            VoipResult::kOk);
  EXPECT_EQ(
      voip_core_->SetReceiveCodecs(channel, {{kPcmuPayload, kPcmuFormat}}),
      VoipResult::kOk);

  // Call StopSend and StopPlayout without starting them in
  // the first place. Should see that it is already in the
  // stopped state and return true.
  EXPECT_EQ(voip_core_->StopSend(channel), VoipResult::kOk);
  EXPECT_EQ(voip_core_->StopPlayout(channel), VoipResult::kOk);

  EXPECT_EQ(voip_core_->ReleaseChannel(channel), VoipResult::kOk);
}

// This tests correctness on ProcessThread usage where we expect the first/last
// channel creation/release triggers its Start/Stop method once only.
TEST_F(VoipCoreTest, TestProcessThreadOperation) {
  EXPECT_CALL(*process_thread_, Start);
  EXPECT_CALL(*process_thread_, RegisterModule).Times(2);

  auto channel_one = voip_core_->CreateChannel(&transport_, 0xdeadc0de);
  auto channel_two = voip_core_->CreateChannel(&transport_, 0xdeadbeef);

  EXPECT_CALL(*process_thread_, Stop);
  EXPECT_CALL(*process_thread_, DeRegisterModule).Times(2);

  EXPECT_EQ(voip_core_->ReleaseChannel(channel_one), VoipResult::kOk);
  EXPECT_EQ(voip_core_->ReleaseChannel(channel_two), VoipResult::kOk);

  EXPECT_CALL(*process_thread_, Start);
  EXPECT_CALL(*process_thread_, RegisterModule);

  auto channel_three = voip_core_->CreateChannel(&transport_, absl::nullopt);

  EXPECT_CALL(*process_thread_, Stop);
  EXPECT_CALL(*process_thread_, DeRegisterModule);

  EXPECT_EQ(voip_core_->ReleaseChannel(channel_three), VoipResult::kOk);
}

}  // namespace
}  // namespace webrtc