// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "remoting/host/video_scheduler.h"

#include "base/bind.h"
#include "base/message_loop/message_loop.h"
#include "base/run_loop.h"
#include "base/single_thread_task_runner.h"
#include "remoting/base/auto_thread.h"
#include "remoting/base/auto_thread_task_runner.h"
#include "remoting/codec/video_encoder.h"
#include "remoting/codec/video_encoder_verbatim.h"
#include "remoting/host/fake_desktop_capturer.h"
#include "remoting/host/fake_mouse_cursor_monitor.h"
#include "remoting/host/host_mock_objects.h"
#include "remoting/proto/control.pb.h"
#include "remoting/proto/video.pb.h"
#include "remoting/protocol/protocol_mock_objects.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/webrtc/modules/desktop_capture/desktop_frame.h"
#include "third_party/webrtc/modules/desktop_capture/mouse_cursor.h"
#include "third_party/webrtc/modules/desktop_capture/screen_capturer_mock_objects.h"

using ::remoting::protocol::MockClientStub;
using ::remoting::protocol::MockVideoStub;

using ::testing::_;
using ::testing::AtLeast;
using ::testing::AnyNumber;
using ::testing::DeleteArg;
using ::testing::DoAll;
using ::testing::Expectation;
using ::testing::InSequence;
using ::testing::InvokeWithoutArgs;
using ::testing::Return;
using ::testing::ReturnRef;
using ::testing::SaveArg;

namespace remoting {

namespace {

ACTION(FinishEncode) {
  scoped_ptr<VideoPacket> packet(new VideoPacket());
  return packet.release();
}

ACTION(FinishSend) {
  arg1.Run();
}

}  // namespace

static const int kWidth = 640;
static const int kHeight = 480;
static const int kCursorWidth = 64;
static const int kCursorHeight = 32;
static const int kHotspotX = 11;
static const int kHotspotY = 12;

class MockVideoEncoder : public VideoEncoder {
 public:
  MockVideoEncoder() {}
  virtual ~MockVideoEncoder() {}

  scoped_ptr<VideoPacket> Encode(const webrtc::DesktopFrame& frame) {
    return make_scoped_ptr(EncodePtr(frame));
  }
  MOCK_METHOD1(EncodePtr, VideoPacket*(const webrtc::DesktopFrame& frame));

 private:
  DISALLOW_COPY_AND_ASSIGN(MockVideoEncoder);
};

class ThreadCheckVideoEncoder : public VideoEncoderVerbatim {
 public:
  ThreadCheckVideoEncoder(
      scoped_refptr<base::SingleThreadTaskRunner> task_runner)
      : task_runner_(task_runner) {
  }
  ~ThreadCheckVideoEncoder() override {
    EXPECT_TRUE(task_runner_->BelongsToCurrentThread());
  }

 private:
  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;

  DISALLOW_COPY_AND_ASSIGN(ThreadCheckVideoEncoder);
};

class ThreadCheckDesktopCapturer : public FakeDesktopCapturer {
 public:
  ThreadCheckDesktopCapturer(
      scoped_refptr<base::SingleThreadTaskRunner> task_runner)
      : task_runner_(task_runner) {
  }
  ~ThreadCheckDesktopCapturer() override {
    EXPECT_TRUE(task_runner_->BelongsToCurrentThread());
  }

 private:
  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;

  DISALLOW_COPY_AND_ASSIGN(ThreadCheckDesktopCapturer);
};

class ThreadCheckMouseCursorMonitor : public FakeMouseCursorMonitor {
 public:
  ThreadCheckMouseCursorMonitor(
      scoped_refptr<base::SingleThreadTaskRunner> task_runner)
      : task_runner_(task_runner) {
  }
  ~ThreadCheckMouseCursorMonitor() override {
    EXPECT_TRUE(task_runner_->BelongsToCurrentThread());
  }

 private:
  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;

  DISALLOW_COPY_AND_ASSIGN(ThreadCheckMouseCursorMonitor);
};

class VideoSchedulerTest : public testing::Test {
 public:
  VideoSchedulerTest();

  void SetUp() override;
  void TearDown() override;

  void StartVideoScheduler(
      scoped_ptr<webrtc::DesktopCapturer> capturer,
      scoped_ptr<VideoEncoder> encoder,
      scoped_ptr<webrtc::MouseCursorMonitor> mouse_monitor);
  void StopVideoScheduler();

  // webrtc::DesktopCapturer mocks.
  void OnCapturerStart(webrtc::DesktopCapturer::Callback* callback);
  void OnCaptureFrame(const webrtc::DesktopRegion& region);

  // webrtc::MouseCursorMonitor mocks.
  void OnMouseCursorMonitorInit(
      webrtc::MouseCursorMonitor::Callback* callback,
      webrtc::MouseCursorMonitor::Mode mode);
  void OnCaptureMouse();
  void SetCursorShape(const protocol::CursorShapeInfo& cursor_shape);

 protected:
  base::MessageLoop message_loop_;
  base::RunLoop run_loop_;
  scoped_refptr<AutoThreadTaskRunner> capture_task_runner_;
  scoped_refptr<AutoThreadTaskRunner> encode_task_runner_;
  scoped_refptr<AutoThreadTaskRunner> main_task_runner_;
  scoped_refptr<VideoScheduler> scheduler_;

  MockClientStub client_stub_;
  MockVideoStub video_stub_;

  // Points to the callback passed to webrtc::DesktopCapturer::Start().
  webrtc::DesktopCapturer::Callback* capturer_callback_;

  // Points to the callback passed to webrtc::MouseCursor::Init().
  webrtc::MouseCursorMonitor::Callback* mouse_monitor_callback_;

 private:
  DISALLOW_COPY_AND_ASSIGN(VideoSchedulerTest);
};

VideoSchedulerTest::VideoSchedulerTest()
    : capturer_callback_(NULL),
      mouse_monitor_callback_(NULL) {
}

void VideoSchedulerTest::SetUp() {
  main_task_runner_ = new AutoThreadTaskRunner(
      message_loop_.message_loop_proxy(), run_loop_.QuitClosure());
  capture_task_runner_ = main_task_runner_;
  encode_task_runner_ = main_task_runner_;
}

void VideoSchedulerTest::TearDown() {
  // Release the task runners, so that the test can quit.
  capture_task_runner_ = NULL;
  encode_task_runner_ = NULL;
  main_task_runner_ = NULL;

  // Run the MessageLoop until everything has torn down.
  run_loop_.Run();
}

void VideoSchedulerTest::StartVideoScheduler(
    scoped_ptr<webrtc::DesktopCapturer> capturer,
    scoped_ptr<VideoEncoder> encoder,
    scoped_ptr<webrtc::MouseCursorMonitor> mouse_monitor) {
  scheduler_ = new VideoScheduler(
      capture_task_runner_,
      encode_task_runner_,
      main_task_runner_,
      capturer.Pass(),
      mouse_monitor.Pass(),
      encoder.Pass(),
      &client_stub_,
      &video_stub_);
  scheduler_->Start();
}

void VideoSchedulerTest::StopVideoScheduler() {
  scheduler_->Stop();
  scheduler_ = NULL;
}

void VideoSchedulerTest::OnCapturerStart(
    webrtc::DesktopCapturer::Callback* callback) {
  EXPECT_FALSE(capturer_callback_);
  EXPECT_TRUE(callback);

  capturer_callback_ = callback;
}

void VideoSchedulerTest::OnCaptureFrame(const webrtc::DesktopRegion& region) {
  scoped_ptr<webrtc::DesktopFrame> frame(
      new webrtc::BasicDesktopFrame(webrtc::DesktopSize(kWidth, kHeight)));
  frame->mutable_updated_region()->SetRect(
      webrtc::DesktopRect::MakeXYWH(0, 0, 10, 10));
  capturer_callback_->OnCaptureCompleted(frame.release());
}

void VideoSchedulerTest::OnCaptureMouse() {
  EXPECT_TRUE(mouse_monitor_callback_);

  scoped_ptr<webrtc::MouseCursor> mouse_cursor(
      new webrtc::MouseCursor(
          new webrtc::BasicDesktopFrame(
              webrtc::DesktopSize(kCursorWidth, kCursorHeight)),
          webrtc::DesktopVector(kHotspotX, kHotspotY)));

  mouse_monitor_callback_->OnMouseCursor(mouse_cursor.release());
}

void VideoSchedulerTest::OnMouseCursorMonitorInit(
    webrtc::MouseCursorMonitor::Callback* callback,
    webrtc::MouseCursorMonitor::Mode mode) {
  EXPECT_FALSE(mouse_monitor_callback_);
  EXPECT_TRUE(callback);

  mouse_monitor_callback_ = callback;
}

void VideoSchedulerTest::SetCursorShape(
    const protocol::CursorShapeInfo& cursor_shape) {
  EXPECT_TRUE(cursor_shape.has_width());
  EXPECT_EQ(kCursorWidth, cursor_shape.width());
  EXPECT_TRUE(cursor_shape.has_height());
  EXPECT_EQ(kCursorHeight, cursor_shape.height());
  EXPECT_TRUE(cursor_shape.has_hotspot_x());
  EXPECT_EQ(kHotspotX, cursor_shape.hotspot_x());
  EXPECT_TRUE(cursor_shape.has_hotspot_y());
  EXPECT_EQ(kHotspotY, cursor_shape.hotspot_y());
  EXPECT_TRUE(cursor_shape.has_data());
  EXPECT_EQ(kCursorWidth * kCursorHeight * webrtc::DesktopFrame::kBytesPerPixel,
            static_cast<int>(cursor_shape.data().size()));
}

// This test mocks capturer, encoder and network layer to simulate one capture
// cycle. When the first encoded packet is submitted to the network
// VideoScheduler is instructed to come to a complete stop. We expect the stop
// sequence to be executed successfully.
TEST_F(VideoSchedulerTest, StartAndStop) {
  scoped_ptr<webrtc::MockScreenCapturer> capturer(
      new webrtc::MockScreenCapturer());
  scoped_ptr<MockMouseCursorMonitor> cursor_monitor(
      new MockMouseCursorMonitor());

  {
    InSequence s;

    EXPECT_CALL(*cursor_monitor, Init(_, _))
        .WillOnce(
            Invoke(this, &VideoSchedulerTest::OnMouseCursorMonitorInit));

    EXPECT_CALL(*cursor_monitor, Capture())
        .WillRepeatedly(Invoke(this, &VideoSchedulerTest::OnCaptureMouse));
  }

  Expectation capturer_start =
      EXPECT_CALL(*capturer, Start(_))
          .WillOnce(Invoke(this, &VideoSchedulerTest::OnCapturerStart));

  // First the capturer is called.
  Expectation capturer_capture = EXPECT_CALL(*capturer, Capture(_))
      .After(capturer_start)
      .WillRepeatedly(Invoke(this, &VideoSchedulerTest::OnCaptureFrame));

  scoped_ptr<MockVideoEncoder> encoder(new MockVideoEncoder());

  // Expect the encoder be called.
  EXPECT_CALL(*encoder, EncodePtr(_))
      .WillRepeatedly(FinishEncode());

  // By default delete the arguments when ProcessVideoPacket is received.
  EXPECT_CALL(video_stub_, ProcessVideoPacketPtr(_, _))
      .WillRepeatedly(FinishSend());

  // When the first ProcessVideoPacket is received we stop the VideoScheduler.
  EXPECT_CALL(video_stub_, ProcessVideoPacketPtr(_, _))
      .WillOnce(DoAll(
          FinishSend(),
          InvokeWithoutArgs(this, &VideoSchedulerTest::StopVideoScheduler)))
      .RetiresOnSaturation();

  EXPECT_CALL(client_stub_, SetCursorShape(_))
      .WillOnce(Invoke(this, &VideoSchedulerTest::SetCursorShape));

  // Start video frame capture.
  scoped_ptr<webrtc::MouseCursorMonitor> mouse_cursor_monitor(
      new FakeMouseCursorMonitor());
  StartVideoScheduler(capturer.Pass(), encoder.Pass(), cursor_monitor.Pass());

  // Run until there are no more pending tasks from the VideoScheduler.
  // Otherwise, a lingering frame capture might attempt to trigger a capturer
  // expectation action and crash.
  base::RunLoop().RunUntilIdle();
}

// Verify that the capturer, encoder and mouse monitor are torn down on the
// correct threads.
TEST_F(VideoSchedulerTest, DeleteOnThreads) {
  capture_task_runner_ = AutoThread::Create("capture", main_task_runner_);
  encode_task_runner_ = AutoThread::Create("encode", main_task_runner_);

  scoped_ptr<webrtc::DesktopCapturer> capturer(
      new ThreadCheckDesktopCapturer(capture_task_runner_));
  scoped_ptr<VideoEncoder> encoder(
      new ThreadCheckVideoEncoder(encode_task_runner_));
  scoped_ptr<webrtc::MouseCursorMonitor> mouse_cursor_monitor(
      new ThreadCheckMouseCursorMonitor(capture_task_runner_));

  // Start and stop the scheduler, so it will tear down the screen capturer,
  // video encoder and mouse monitor.
  StartVideoScheduler(capturer.Pass(), encoder.Pass(),
                      mouse_cursor_monitor.Pass());
  StopVideoScheduler();
}

}  // namespace remoting