// Copyright 2013 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 "ash/public/cpp/immersive/immersive_fullscreen_controller.h"

#include "ash/frame/header_view.h"
#include "ash/frame/non_client_frame_view_ash.h"
#include "ash/public/cpp/ash_features.h"
#include "ash/public/cpp/immersive/immersive_fullscreen_controller_delegate.h"
#include "ash/public/cpp/immersive/immersive_fullscreen_controller_test_api.h"
#include "ash/public/cpp/shelf_types.h"
#include "ash/root_window_controller.h"
#include "ash/shelf/shelf.h"
#include "ash/shell.h"
#include "ash/test/ash_test_base.h"
#include "ash/wm/splitview/split_view_controller.h"
#include "ash/wm/tablet_mode/tablet_mode_controller.h"
#include "ash/wm/window_state.h"
#include "base/test/scoped_feature_list.h"
#include "ui/aura/client/aura_constants.h"
#include "ui/aura/client/cursor_client.h"
#include "ui/aura/env.h"
#include "ui/aura/test/test_window_delegate.h"
#include "ui/aura/window.h"
#include "ui/aura/window_event_dispatcher.h"
#include "ui/display/display_layout.h"
#include "ui/display/manager/display_manager.h"
#include "ui/display/test/display_manager_test_api.h"
#include "ui/events/event_utils.h"
#include "ui/events/test/event_generator.h"
#include "ui/events/test/test_event_handler.h"
#include "ui/gfx/animation/slide_animation.h"
#include "ui/views/bubble/bubble_dialog_delegate_view.h"
#include "ui/views/controls/native/native_view_host.h"
#include "ui/views/view.h"
#include "ui/views/widget/widget.h"

namespace ash {

namespace {

class TestBubbleDialogDelegate : public views::BubbleDialogDelegateView {
 public:
  explicit TestBubbleDialogDelegate(views::View* anchor)
      : BubbleDialogDelegateView(anchor, views::BubbleBorder::NONE) {}
  ~TestBubbleDialogDelegate() override = default;

 private:
  DISALLOW_COPY_AND_ASSIGN(TestBubbleDialogDelegate);
};

class MockImmersiveFullscreenControllerDelegate
    : public ImmersiveFullscreenControllerDelegate {
 public:
  MockImmersiveFullscreenControllerDelegate(views::View* top_container_view)
      : top_container_view_(top_container_view),
        enabled_(false),
        visible_fraction_(1) {}
  ~MockImmersiveFullscreenControllerDelegate() override = default;

  // ImmersiveFullscreenControllerDelegate overrides:
  void OnImmersiveRevealStarted() override {
    enabled_ = true;
    visible_fraction_ = 0;
  }
  void OnImmersiveRevealEnded() override { visible_fraction_ = 0; }
  void OnImmersiveFullscreenEntered() override {}
  void OnImmersiveFullscreenExited() override {
    enabled_ = false;
    visible_fraction_ = 1;
  }
  void SetVisibleFraction(double visible_fraction) override {
    visible_fraction_ = visible_fraction;
  }
  std::vector<gfx::Rect> GetVisibleBoundsInScreen() const override {
    std::vector<gfx::Rect> bounds_in_screen;
    bounds_in_screen.push_back(top_container_view_->GetBoundsInScreen());
    return bounds_in_screen;
  }

  bool is_enabled() const { return enabled_; }

  double visible_fraction() const { return visible_fraction_; }

 private:
  views::View* top_container_view_;
  bool enabled_;
  double visible_fraction_;

  DISALLOW_COPY_AND_ASSIGN(MockImmersiveFullscreenControllerDelegate);
};

class ConsumeEventHandler : public ui::test::TestEventHandler {
 public:
  ConsumeEventHandler() = default;
  ~ConsumeEventHandler() override = default;

 private:
  void OnEvent(ui::Event* event) override {
    ui::test::TestEventHandler::OnEvent(event);
    if (event->cancelable())
      event->SetHandled();
  }

  DISALLOW_COPY_AND_ASSIGN(ConsumeEventHandler);
};

}  // namespace

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

class TestWidgetDelegate : public views::WidgetDelegateView {
 public:
  TestWidgetDelegate() = default;
  ~TestWidgetDelegate() override = default;

  // views::WidgetDelegateView:
  bool CanResize() const override { return true; }
  bool CanMaximize() const override { return true; }
  bool CanActivate() const override { return true; }
  views::NonClientFrameView* CreateNonClientFrameView(
      views::Widget* widget) override {
    return new NonClientFrameViewAsh(widget);
  }

 private:
  DISALLOW_COPY_AND_ASSIGN(TestWidgetDelegate);
};

class ImmersiveFullscreenControllerTest : public AshTestBase {
 public:
  enum Modality {
    MODALITY_MOUSE,
    MODALITY_GESTURE_TAP,
    MODALITY_GESTURE_SCROLL
  };

  ImmersiveFullscreenControllerTest() = default;
  ~ImmersiveFullscreenControllerTest() override = default;

  ImmersiveFullscreenController* controller() {
    return ImmersiveFullscreenController::GetForTest(widget());
  }

  views::NativeViewHost* content_view() { return content_view_; }

  views::View* top_container() {
    return NonClientFrameViewAsh::Get(window())->GetHeaderView();
  }

  views::Widget* widget() { return widget_; }

  aura::Window* window() { return widget_->GetNativeWindow(); }

  HeaderView* immersive_delegate() {
    return NonClientFrameViewAsh::Get(window())->GetHeaderView();
  }

  // Access to private data from the controller.
  bool top_edge_hover_timer_running() {
    return controller()->top_edge_hover_timer_.IsRunning();
  }
  int mouse_x_when_hit_top() {
    return controller()->mouse_x_when_hit_top_in_screen_;
  }

  // AshTestBase:
  void SetUp() override {
    AshTestBase::SetUp();

    test_api_animation_disabler_ = std::make_unique<
        ImmersiveFullscreenControllerTestApi::GlobalAnimationDisabler>();

    widget_ = new views::Widget();
    views::Widget::InitParams params;
    params.delegate = new TestWidgetDelegate();
    params.context = CurrentContext();
    widget_->Init(params);
    widget_->Show();

    SetWindowShowState(ui::SHOW_STATE_FULLSCREEN);
    gfx::Size window_size = widget_->GetWindowBoundsInScreen().size();
    content_view_ = new views::NativeViewHost();
    content_view_->SetBounds(0, 0, window_size.width(), window_size.height());
    widget_->GetContentsView()->AddChildView(content_view_);

    test_api_ =
        std::make_unique<ImmersiveFullscreenControllerTestApi>(controller());
    test_api_->SetupForTest();
  }

  // Enables / disables immersive fullscreen.
  void SetEnabled(bool enabled) {
    ImmersiveFullscreenController::EnableForWidget(widget_, enabled);
  }

  // Attempt to reveal the top-of-window views via |modality|.
  // The top-of-window views can only be revealed via mouse hover or a gesture.
  void AttemptReveal(Modality modality) {
    ASSERT_NE(modality, MODALITY_GESTURE_TAP);
    AttemptRevealStateChange(true, modality);
  }

  // Attempt to unreveal the top-of-window views via |modality|. The
  // top-of-window views can be unrevealed via any modality.
  void AttemptUnreveal(Modality modality) {
    AttemptRevealStateChange(false, modality);
  }

  // Sets whether the mouse is hovered above |top_container_|.
  // SetHovered(true) moves the mouse over the |top_container_| but does not
  // move it to the top of the screen so will not initiate a reveal.
  void SetHovered(bool is_mouse_hovered) {
    MoveMouse(0, is_mouse_hovered ? 10 : top_container()->height() + 100);
  }

  // Move the mouse to the given coordinates. The coordinates should be in
  // |top_container_| coordinates.
  void MoveMouse(int x, int y) {
    gfx::Point screen_position(x, y);
    views::View::ConvertPointToScreen(top_container(), &screen_position);
    GetEventGenerator()->MoveMouseTo(screen_position.x(), screen_position.y());

    // If the top edge timer started running as a result of the mouse move, run
    // the task which occurs after the timer delay. This reveals the
    // top-of-window views synchronously if the mouse is hovered at the top of
    // the screen.
    if (controller()->top_edge_hover_timer_.IsRunning()) {
      controller()->top_edge_hover_timer_.FireNow();
    }
  }

  void SetWindowShowState(ui::WindowShowState show_state) {
    window()->SetProperty(aura::client::kShowStateKey, show_state);
  }

  // Enable or disable tablet mode based on |enable|.
  void EnableTabletMode(bool enable) {
    Shell::Get()->tablet_mode_controller()->EnableTabletModeWindowManager(
        enable);
  }

 private:
  // Attempt to change the revealed state to |revealed| via |modality|.
  void AttemptRevealStateChange(bool revealed, Modality modality) {
    // Compute the event position in |top_container()| coordinates.
    gfx::Point event_position(0,
                              revealed ? 0 : top_container()->height() + 100);
    switch (modality) {
      case MODALITY_MOUSE: {
        MoveMouse(event_position.x(), event_position.y());
        break;
      }
      case MODALITY_GESTURE_TAP: {
        gfx::Point screen_position = event_position;
        views::View::ConvertPointToScreen(top_container(), &screen_position);
        ui::test::EventGenerator* event_generator = GetEventGenerator();
        event_generator->MoveTouch(event_position);
        event_generator->PressTouch();
        event_generator->ReleaseTouch();
        break;
      }
      case MODALITY_GESTURE_SCROLL: {
        gfx::Point start(0, revealed ? 0 : 2);
        gfx::Vector2d scroll_delta(0, 40);
        gfx::Point end = revealed ? start + scroll_delta : start - scroll_delta;
        views::View::ConvertPointToScreen(top_container(), &start);
        views::View::ConvertPointToScreen(top_container(), &end);
        ui::test::EventGenerator* event_generator = GetEventGenerator();
        event_generator->GestureScrollSequence(
            start, end, base::TimeDelta::FromMilliseconds(30), 1);
        break;
      }
    }
  }

  std::unique_ptr<ImmersiveFullscreenControllerTestApi::GlobalAnimationDisabler>
      test_api_animation_disabler_;
  views::Widget* widget_ = nullptr;  // Owned by the native widget.
  views::NativeViewHost* content_view_ =
      nullptr;  // Owned by |widget_|'s root-view.
  std::unique_ptr<ImmersiveFullscreenControllerTestApi> test_api_;

  base::test::ScopedFeatureList scoped_feature_list_;

  DISALLOW_COPY_AND_ASSIGN(ImmersiveFullscreenControllerTest);
};

// Test the initial state and that the delegate gets notified of the
// top-of-window views getting hidden and revealed.
TEST_F(ImmersiveFullscreenControllerTest, Delegate) {
  SetWindowShowState(ui::SHOW_STATE_MAXIMIZED);

  // Initial state.
  EXPECT_FALSE(controller()->IsEnabled());
  EXPECT_FALSE(controller()->IsRevealed());
  EXPECT_FALSE(immersive_delegate()->in_immersive_mode());

  // Enabling initially hides the top views.
  SetEnabled(true);
  EXPECT_TRUE(controller()->IsEnabled());
  EXPECT_FALSE(controller()->IsRevealed());
  EXPECT_TRUE(immersive_delegate()->in_immersive_mode());
  EXPECT_FALSE(immersive_delegate()->is_revealed());

  // Revealing shows the top views.
  AttemptReveal(MODALITY_MOUSE);
  EXPECT_TRUE(controller()->IsEnabled());
  EXPECT_TRUE(controller()->IsRevealed());
  EXPECT_TRUE(immersive_delegate()->in_immersive_mode());
  EXPECT_TRUE(immersive_delegate()->is_revealed());

  // Disabling ends the immersive reveal.
  SetEnabled(false);
  EXPECT_FALSE(controller()->IsEnabled());
  EXPECT_FALSE(controller()->IsRevealed());
  EXPECT_FALSE(immersive_delegate()->in_immersive_mode());
}

// GetRevealedLock() specific tests.
TEST_F(ImmersiveFullscreenControllerTest, RevealedLock) {
  SetWindowShowState(ui::SHOW_STATE_MAXIMIZED);

  std::unique_ptr<ImmersiveRevealedLock> lock1;
  std::unique_ptr<ImmersiveRevealedLock> lock2;

  // Immersive fullscreen is not on by default.
  EXPECT_FALSE(controller()->IsEnabled());

  // 1) Test acquiring and releasing a revealed state lock while immersive
  // fullscreen is disabled. Acquiring or releasing the lock should have no
  // effect till immersive fullscreen is enabled.
  lock1.reset(controller()->GetRevealedLock(
      ImmersiveFullscreenController::ANIMATE_REVEAL_NO));
  EXPECT_FALSE(controller()->IsEnabled());
  EXPECT_FALSE(controller()->IsRevealed());

  // Immersive fullscreen should start in the revealed state due to the lock.
  SetEnabled(true);
  EXPECT_TRUE(controller()->IsEnabled());
  EXPECT_TRUE(controller()->IsRevealed());

  SetEnabled(false);
  EXPECT_FALSE(controller()->IsEnabled());
  EXPECT_FALSE(controller()->IsRevealed());

  lock1.reset();
  EXPECT_FALSE(controller()->IsEnabled());
  EXPECT_FALSE(controller()->IsRevealed());

  // Immersive fullscreen should start in the closed state because the lock is
  // no longer held.
  SetEnabled(true);
  EXPECT_TRUE(controller()->IsEnabled());
  EXPECT_FALSE(controller()->IsRevealed());

  // 2) Test that acquiring a lock reveals the top-of-window views if they are
  // hidden.
  lock1.reset(controller()->GetRevealedLock(
      ImmersiveFullscreenController::ANIMATE_REVEAL_NO));
  EXPECT_TRUE(controller()->IsRevealed());

  // Move the mouse below the top container bounds so the hover doesn't make the
  // reveal persist.
  MoveMouse(0, top_container()->GetBoundsInScreen().bottom() + 10);

  // 3) Test that the top-of-window views are only hidden when all of the locks
  // are released.
  lock2.reset(controller()->GetRevealedLock(
      ImmersiveFullscreenController::ANIMATE_REVEAL_NO));
  lock1.reset();
  EXPECT_TRUE(controller()->IsRevealed());

  lock2.reset();
  EXPECT_FALSE(controller()->IsRevealed());
}

// Test mouse event processing for top-of-screen reveal triggering.
TEST_F(ImmersiveFullscreenControllerTest, OnMouseEvent) {
  // Create 2nd display for off screen test.
  UpdateDisplay("800x600, 800x600");
  // Set up initial state.
  SetEnabled(true);
  ASSERT_TRUE(controller()->IsEnabled());
  ASSERT_FALSE(controller()->IsRevealed());

  ui::test::EventGenerator* event_generator = GetEventGenerator();

  gfx::Rect top_container_bounds_in_screen =
      top_container()->GetBoundsInScreen();
  // A position along the top edge of TopContainerView in screen coordinates.
  gfx::Point top_edge_pos(top_container_bounds_in_screen.x() + 100,
                          top_container_bounds_in_screen.y());

  // Mouse wheel event does nothing.
  ui::MouseWheelEvent wheel(gfx::Vector2d(), top_edge_pos, top_edge_pos,
                            ui::EventTimeForNow(), ui::EF_NONE, ui::EF_NONE);
  event_generator->Dispatch(&wheel);
  EXPECT_FALSE(top_edge_hover_timer_running());

  // Move to top edge of screen starts hover timer running. We cannot use
  // MoveMouse() because MoveMouse() stops the timer if it started running.
  event_generator->MoveMouseTo(top_edge_pos);
  EXPECT_TRUE(top_edge_hover_timer_running());
  EXPECT_EQ(top_edge_pos.x(), mouse_x_when_hit_top());

  // Moving |ImmersiveFullscreenControllerTest::kMouseRevealBoundsHeight| down
  // from the top edge stops it.
  event_generator->MoveMouseBy(
      0, ImmersiveFullscreenController::kMouseRevealBoundsHeight);
  EXPECT_FALSE(top_edge_hover_timer_running());

  // Moving back to the top starts the timer again.
  event_generator->MoveMouseTo(top_edge_pos);
  EXPECT_TRUE(top_edge_hover_timer_running());
  EXPECT_EQ(top_edge_pos.x(), mouse_x_when_hit_top());

  // Slight move to the right keeps the timer running for the same hit point.
  event_generator->MoveMouseBy(1, 0);
  EXPECT_TRUE(top_edge_hover_timer_running());
  EXPECT_EQ(top_edge_pos.x(), mouse_x_when_hit_top());

  // Moving back to the left also keeps the timer running.
  event_generator->MoveMouseBy(-1, 0);
  EXPECT_TRUE(top_edge_hover_timer_running());
  EXPECT_EQ(top_edge_pos.x(), mouse_x_when_hit_top());

  // Large move right restarts the timer (so it is still running) and considers
  // this a new hit at the top.
  event_generator->MoveMouseTo(top_edge_pos.x() + 100, top_edge_pos.y());
  EXPECT_TRUE(top_edge_hover_timer_running());
  EXPECT_EQ(top_edge_pos.x() + 100, mouse_x_when_hit_top());

  // Moving off the top edge horizontally stops the timer.
  event_generator->MoveMouseTo(top_container_bounds_in_screen.right() + 1,
                               top_container_bounds_in_screen.y());
  EXPECT_FALSE(top_edge_hover_timer_running());

  // Once revealed, a move just a little below the top container doesn't end a
  // reveal.
  AttemptReveal(MODALITY_MOUSE);
  event_generator->MoveMouseTo(top_container_bounds_in_screen.x(),
                               top_container_bounds_in_screen.bottom() + 1);
  EXPECT_TRUE(controller()->IsRevealed());

  // Once revealed, clicking just below the top container ends the reveal.
  event_generator->ClickLeftButton();
  EXPECT_FALSE(controller()->IsRevealed());

  // Moving a lot below the top container ends a reveal.
  AttemptReveal(MODALITY_MOUSE);
  EXPECT_TRUE(controller()->IsRevealed());
  event_generator->MoveMouseTo(top_container_bounds_in_screen.x(),
                               top_container_bounds_in_screen.bottom() + 50);
  EXPECT_FALSE(controller()->IsRevealed());

  // The mouse position cannot cause a reveal when the top container's widget
  // has capture.
  views::Widget* widget = top_container()->GetWidget();
  widget->SetCapture(top_container());
  AttemptReveal(MODALITY_MOUSE);
  EXPECT_FALSE(controller()->IsRevealed());
  widget->ReleaseCapture();

  // The mouse position cannot end the reveal while the top container's widget
  // has capture.
  AttemptReveal(MODALITY_MOUSE);
  EXPECT_TRUE(controller()->IsRevealed());
  widget->SetCapture(top_container());
  event_generator->MoveMouseTo(top_container_bounds_in_screen.x(),
                               top_container_bounds_in_screen.bottom() + 51);
  EXPECT_TRUE(controller()->IsRevealed());

  // Releasing capture should end the reveal.
  widget->ReleaseCapture();
  EXPECT_FALSE(controller()->IsRevealed());
}

// Test mouse event processing for top-of-screen reveal triggering when the
// top container's widget is inactive.
TEST_F(ImmersiveFullscreenControllerTest, Inactive) {
  // Set up initial state.
  views::Widget* popup_widget = views::Widget::CreateWindowWithContextAndBounds(
      nullptr, CurrentContext(), gfx::Rect(0, 0, 200, 200));
  popup_widget->Show();
  ASSERT_FALSE(top_container()->GetWidget()->IsActive());

  SetEnabled(true);
  ASSERT_TRUE(controller()->IsEnabled());
  ASSERT_FALSE(controller()->IsRevealed());

  gfx::Rect top_container_bounds_in_screen =
      top_container()->GetBoundsInScreen();
  gfx::Rect popup_bounds_in_screen = popup_widget->GetWindowBoundsInScreen();
  ASSERT_EQ(top_container_bounds_in_screen.origin().ToString(),
            popup_bounds_in_screen.origin().ToString());
  ASSERT_GT(top_container_bounds_in_screen.right(),
            popup_bounds_in_screen.right());

  // The top-of-window views should stay hidden if the cursor is at the top edge
  // but above an obscured portion of the top-of-window views.
  MoveMouse(popup_bounds_in_screen.x(), top_container_bounds_in_screen.y());
  EXPECT_FALSE(controller()->IsRevealed());

  // The top-of-window views should reveal if the cursor is at the top edge and
  // above an unobscured portion of the top-of-window views.
  MoveMouse(top_container_bounds_in_screen.right() - 1,
            top_container_bounds_in_screen.y());
  EXPECT_TRUE(controller()->IsRevealed());

  // The top-of-window views should stay revealed if the cursor is moved off
  // of the top edge.
  MoveMouse(top_container_bounds_in_screen.right() - 1,
            top_container_bounds_in_screen.bottom() - 1);
  EXPECT_TRUE(controller()->IsRevealed());

  // Moving way off of the top-of-window views should end the immersive reveal.
  MoveMouse(top_container_bounds_in_screen.right() - 1,
            top_container_bounds_in_screen.bottom() + 50);
  EXPECT_FALSE(controller()->IsRevealed());

  // Moving way off of the top-of-window views in a region where the
  // top-of-window views are obscured should also end the immersive reveal.
  // Ideally, the immersive reveal would end immediately when the cursor moves
  // to an obscured portion of the top-of-window views.
  MoveMouse(top_container_bounds_in_screen.right() - 1,
            top_container_bounds_in_screen.y());
  EXPECT_TRUE(controller()->IsRevealed());
  MoveMouse(top_container_bounds_in_screen.x(),
            top_container_bounds_in_screen.bottom() + 50);
  EXPECT_FALSE(controller()->IsRevealed());
}

// Test mouse event processing for top-of-screen reveal triggering when the user
// has a vertical display layout (primary display above/below secondary display)
// and the immersive fullscreen window is on the bottom display.
TEST_F(ImmersiveFullscreenControllerTest, MouseEventsVerticalDisplayLayout) {
  // Set up initial state.
  UpdateDisplay("800x600,800x600");
  ash::Shell::Get()->display_manager()->SetLayoutForCurrentDisplays(
      display::test::CreateDisplayLayout(display_manager(),
                                         display::DisplayPlacement::TOP, 0));

  SetEnabled(true);
  ASSERT_TRUE(controller()->IsEnabled());
  ASSERT_FALSE(controller()->IsRevealed());

  aura::Window::Windows root_windows = ash::Shell::GetAllRootWindows();
  ASSERT_EQ(root_windows[0],
            top_container()->GetWidget()->GetNativeWindow()->GetRootWindow());

  gfx::Rect primary_root_window_bounds_in_screen =
      root_windows[0]->GetBoundsInScreen();
  // Do not set |x| to the root window's x position because the display's
  // corners have special behavior.
  int x = primary_root_window_bounds_in_screen.x() + 10;
  // The y position of the top edge of the primary display.
  int y_top_edge = primary_root_window_bounds_in_screen.y();

  ui::test::EventGenerator* event_generator = GetEventGenerator();

  // Moving right below the top edge starts the hover timer running. We
  // cannot use MoveMouse() because MoveMouse() stops the timer if it started
  // running.
  event_generator->MoveMouseTo(x, y_top_edge + 1);
  EXPECT_TRUE(top_edge_hover_timer_running());
  EXPECT_EQ(y_top_edge + 1,
            aura::Env::GetInstance()->last_mouse_location().y());

  // The timer should continue running if the user moves the mouse to the top
  // edge even though the mouse is warped to the secondary display.
  event_generator->MoveMouseTo(x, y_top_edge);
  EXPECT_TRUE(top_edge_hover_timer_running());

  // The timer should continue running if the user overshoots the top edge
  // a bit.
  event_generator->MoveMouseTo(x, y_top_edge - 2);
  EXPECT_TRUE(top_edge_hover_timer_running());

  // The timer should stop running if the user overshoots the top edge by
  // a lot.
  event_generator->MoveMouseTo(x, y_top_edge - 20);
  EXPECT_FALSE(top_edge_hover_timer_running());

  // The timer should not start if the user moves the mouse to the bottom of the
  // secondary display without crossing the top edge first.
  event_generator->MoveMouseTo(x, y_top_edge - 2);

  // Reveal the top-of-window views by overshooting the top edge slightly.
  event_generator->MoveMouseTo(x, y_top_edge + 1);
  // MoveMouse() runs the timer task.
  MoveMouse(x, y_top_edge - 2);
  EXPECT_TRUE(controller()->IsRevealed());

  // The top-of-window views should stay revealed if the user moves the mouse
  // around in the bottom region of the secondary display.
  event_generator->MoveMouseTo(x + 10, y_top_edge - 3);
  EXPECT_TRUE(controller()->IsRevealed());

  // The top-of-window views should hide if the user moves the mouse away from
  // the bottom region of the secondary display.
  event_generator->MoveMouseTo(x, y_top_edge - 20);
  EXPECT_FALSE(controller()->IsRevealed());

  // Test that it is possible to reveal the top-of-window views by overshooting
  // the top edge slightly when the top container's widget is not active.
  views::Widget* popup_widget = views::Widget::CreateWindowWithContextAndBounds(
      nullptr, CurrentContext(), gfx::Rect(0, 200, 100, 100));
  popup_widget->Show();
  ASSERT_FALSE(top_container()->GetWidget()->IsActive());
  ASSERT_FALSE(top_container()->GetBoundsInScreen().Intersects(
      popup_widget->GetWindowBoundsInScreen()));
  event_generator->MoveMouseTo(x, y_top_edge + 1);
  MoveMouse(x, y_top_edge - 2);
  EXPECT_TRUE(controller()->IsRevealed());
}

// Test behavior when the mouse becomes hovered without moving.
TEST_F(ImmersiveFullscreenControllerTest, MouseHoveredWithoutMoving) {
  SetEnabled(true);
  std::unique_ptr<ImmersiveRevealedLock> lock;

  // 1) Test that if the mouse becomes hovered without the mouse moving due to a
  // lock causing the top-of-window views to be revealed (and the mouse
  // happening to be near the top of the screen), the top-of-window views do not
  // hide till the mouse moves off of the top-of-window views.
  SetHovered(true);
  EXPECT_FALSE(controller()->IsRevealed());
  lock.reset(controller()->GetRevealedLock(
      ImmersiveFullscreenController::ANIMATE_REVEAL_NO));
  EXPECT_TRUE(controller()->IsRevealed());
  lock.reset();
  EXPECT_TRUE(controller()->IsRevealed());
  SetHovered(false);
  EXPECT_FALSE(controller()->IsRevealed());

  // 2) Test that if the mouse becomes hovered without moving because of a
  // reveal in ImmersiveFullscreenController::SetEnabled(true) and there are no
  // locks keeping the top-of-window views revealed, that mouse hover does not
  // prevent the top-of-window views from closing.
  SetEnabled(false);
  SetHovered(true);
  EXPECT_FALSE(controller()->IsRevealed());
  SetEnabled(true);
  EXPECT_FALSE(controller()->IsRevealed());

  // 3) Test that if the mouse becomes hovered without moving because of a
  // reveal in ImmersiveFullscreenController::SetEnabled(true) and there is a
  // lock keeping the top-of-window views revealed, that the top-of-window views
  // do not hide till the mouse moves off of the top-of-window views.
  SetEnabled(false);
  SetHovered(true);
  lock.reset(controller()->GetRevealedLock(
      ImmersiveFullscreenController::ANIMATE_REVEAL_NO));
  EXPECT_FALSE(controller()->IsRevealed());
  SetEnabled(true);
  EXPECT_TRUE(controller()->IsRevealed());
  lock.reset();
  EXPECT_TRUE(controller()->IsRevealed());
  SetHovered(false);
  EXPECT_FALSE(controller()->IsRevealed());
}

// Test revealing the top-of-window views using one modality and ending
// the reveal via another. For instance, initiating the reveal via a SWIPE_OPEN
// edge gesture, switching to using the mouse and ending the reveal by moving
// the mouse off of the top-of-window views.
TEST_F(ImmersiveFullscreenControllerTest, DifferentModalityEnterExit) {
  SetEnabled(true);
  EXPECT_TRUE(controller()->IsEnabled());
  EXPECT_FALSE(controller()->IsRevealed());

  // Initiate reveal via gesture, end reveal via mouse.
  AttemptReveal(MODALITY_GESTURE_SCROLL);
  EXPECT_TRUE(controller()->IsRevealed());
  MoveMouse(1, 1);
  EXPECT_TRUE(controller()->IsRevealed());
  AttemptUnreveal(MODALITY_MOUSE);
  EXPECT_FALSE(controller()->IsRevealed());

  // Initiate reveal via gesture, end reveal via touch.
  AttemptReveal(MODALITY_GESTURE_SCROLL);
  EXPECT_TRUE(controller()->IsRevealed());
  AttemptUnreveal(MODALITY_GESTURE_TAP);
  EXPECT_FALSE(controller()->IsRevealed());

  // Initiate reveal via mouse, end reveal via gesture.
  AttemptReveal(MODALITY_MOUSE);
  EXPECT_TRUE(controller()->IsRevealed());
  AttemptUnreveal(MODALITY_GESTURE_SCROLL);
  EXPECT_FALSE(controller()->IsRevealed());

  // Initiate reveal via mouse, end reveal via touch.
  AttemptReveal(MODALITY_MOUSE);
  EXPECT_TRUE(controller()->IsRevealed());
  AttemptUnreveal(MODALITY_GESTURE_TAP);
  EXPECT_FALSE(controller()->IsRevealed());
}

// Tests the top-of-window views for maximized/full-screened/snapped windows in
// tablet mode.
TEST_F(ImmersiveFullscreenControllerTest, WindowsInTabletMode) {
  EnableTabletMode(true);
  SetEnabled(true);
  EXPECT_TRUE(controller()->IsEnabled());
  EXPECT_FALSE(controller()->IsRevealed());

  // Top-of-window views will not be revealed through gesture scroll for
  // fullscreen window in tablet mode. (Instead, the window is dragged.)
  AttemptReveal(MODALITY_GESTURE_SCROLL);
  EXPECT_FALSE(controller()->IsRevealed());

  // Top-of-window views will be revealed for fullscreen windows not in tablet
  // mode.
  EnableTabletMode(false);
  AttemptReveal(MODALITY_GESTURE_SCROLL);
  EXPECT_TRUE(controller()->IsRevealed());
  AttemptUnreveal(MODALITY_GESTURE_SCROLL);
  EXPECT_FALSE(controller()->IsRevealed());

  // Top-of-window views will not be revealed for full-screened window in tablet
  // mode either.
  EnableTabletMode(true);
  SetWindowShowState(ui::SHOW_STATE_FULLSCREEN);
  AttemptReveal(MODALITY_GESTURE_SCROLL);
  EXPECT_FALSE(controller()->IsRevealed());

  // Top-of-window views will not be revealed for snapped window in splitview
  // mode either.
  Shell::Get()->split_view_controller()->SnapWindow(window(),
                                                    SplitViewController::LEFT);
  EXPECT_TRUE(wm::GetWindowState(window())->IsSnapped());
  EXPECT_TRUE(Shell::Get()->split_view_controller()->InSplitViewMode());
  AttemptReveal(MODALITY_GESTURE_SCROLL);
  EXPECT_FALSE(controller()->IsRevealed());
}

// Test when the SWIPE_CLOSE edge gesture closes the top-of-window views.
TEST_F(ImmersiveFullscreenControllerTest, EndRevealViaGesture) {
  SetEnabled(true);
  EXPECT_TRUE(controller()->IsEnabled());
  EXPECT_FALSE(controller()->IsRevealed());

  // A gesture should be able to close the top-of-window views when
  // top-of-window views have focus.
  AttemptReveal(MODALITY_MOUSE);
  top_container()->RequestFocus();
  EXPECT_TRUE(controller()->IsRevealed());
  AttemptUnreveal(MODALITY_GESTURE_SCROLL);
  EXPECT_FALSE(controller()->IsRevealed());

  // The top-of-window views should no longer have focus. Clearing focus is
  // important because it closes focus-related popup windows like the touch
  // selection handles.
  EXPECT_FALSE(top_container()->HasFocus());

  // If some other code is holding onto a lock, a gesture should not be able to
  // end the reveal.
  AttemptReveal(MODALITY_MOUSE);
  std::unique_ptr<ImmersiveRevealedLock> lock(controller()->GetRevealedLock(
      ImmersiveFullscreenController::ANIMATE_REVEAL_NO));
  EXPECT_TRUE(controller()->IsRevealed());
  AttemptUnreveal(MODALITY_GESTURE_SCROLL);
  EXPECT_TRUE(controller()->IsRevealed());
  lock.reset();
  EXPECT_FALSE(controller()->IsRevealed());
}

// Tests that touch-gesture can be used to reveal the top-of-window views when
// the child window consumes all events.
TEST_F(ImmersiveFullscreenControllerTest, RevealViaGestureChildConsumesEvents) {
  // Enabling initially hides the top views.
  SetEnabled(true);
  EXPECT_TRUE(controller()->IsEnabled());
  EXPECT_FALSE(controller()->IsRevealed());

  aura::test::TestWindowDelegate child_delegate;
  std::unique_ptr<aura::Window> child(
      CreateTestWindowInShellWithDelegateAndType(
          &child_delegate, aura::client::WINDOW_TYPE_CONTROL, 1234,
          gfx::Rect()));
  content_view()->Attach(child.get());
  content_view()->Layout();

  ConsumeEventHandler handler;
  child->AddPreTargetHandler(&handler);

  // Reveal the top views using a touch-scroll gesture. The child window should
  // not receive the touch events.
  AttemptReveal(MODALITY_GESTURE_SCROLL);
  EXPECT_TRUE(controller()->IsRevealed());
  EXPECT_EQ(0, handler.num_touch_events());

  AttemptUnreveal(MODALITY_GESTURE_TAP);
  EXPECT_FALSE(controller()->IsRevealed());
  EXPECT_GT(handler.num_touch_events(), 0);
  child->RemovePreTargetHandler(&handler);
}

// Make sure touch events towards the top of the window do not leak through to
// windows underneath.
TEST_F(ImmersiveFullscreenControllerTest, EventsDoNotLeakToWindowUnderneath) {
  gfx::Rect window_bounds = window()->GetBoundsInScreen();
  aura::test::TestWindowDelegate child_delegate;
  std::unique_ptr<aura::Window> behind(CreateTestWindowInShellWithDelegate(
      &child_delegate, 1234, window_bounds));
  behind->Show();
  behind->SetBounds(window_bounds);
  widget()->StackAbove(behind.get());

  // Make sure the windows are aligned on top.
  EXPECT_EQ(behind->GetBoundsInScreen().y(), window()->GetBoundsInScreen().y());
  int top = behind->GetBoundsInScreen().y();

  ui::TouchEvent touch(
      ui::ET_TOUCH_MOVED, gfx::Point(10, top), ui::EventTimeForNow(),
      ui::PointerDetails(ui::EventPointerType::POINTER_TYPE_TOUCH, 0));
  aura::Window* root = window()->GetRootWindow();
  ui::EventTargeter* targeter =
      root->GetHost()->dispatcher()->GetDefaultEventTargeter();
  EXPECT_EQ(window(), targeter->FindTargetForEvent(root, &touch));

  SetEnabled(true);
  EXPECT_FALSE(controller()->IsRevealed());
  // Make sure the windows are still aligned on top.
  EXPECT_EQ(behind->GetBoundsInScreen().y(), window()->GetBoundsInScreen().y());
  top = behind->GetBoundsInScreen().y();
  ui::TouchEvent touch2(
      ui::ET_TOUCH_MOVED, gfx::Point(10, top), ui::EventTimeForNow(),
      ui::PointerDetails(ui::EventPointerType::POINTER_TYPE_TOUCH, 0));
  // The event should still be targeted to window().
  EXPECT_EQ(window(), targeter->FindTargetForEvent(root, &touch2));
}

// Check that the window state gets properly marked for immersive fullscreen.
TEST_F(ImmersiveFullscreenControllerTest, WindowStateImmersiveFullscreen) {
  ash::wm::WindowState* window_state = ash::wm::GetWindowState(window());
  SetWindowShowState(ui::SHOW_STATE_NORMAL);

  EXPECT_FALSE(window_state->IsInImmersiveFullscreen());
  SetEnabled(true);
  ASSERT_TRUE(controller()->IsEnabled());
  EXPECT_TRUE(window_state->IsInImmersiveFullscreen());

  SetEnabled(false);
  ASSERT_FALSE(controller()->IsEnabled());
  EXPECT_FALSE(window_state->IsInImmersiveFullscreen());
}

// Test how focus and activation affects whether the top-of-window views are
// revealed.
TEST_F(ImmersiveFullscreenControllerTest, Focus) {
  // Add views to the view hierarchy which we will focus and unfocus during the
  // test.
  views::View* child_view = new views::View();
  child_view->SetBounds(0, 0, 10, 10);
  child_view->SetFocusBehavior(views::View::FocusBehavior::ALWAYS);
  top_container()->AddChildView(child_view);
  views::View* unrelated_view = new views::View();
  unrelated_view->SetBounds(0, 100, 10, 10);
  unrelated_view->SetFocusBehavior(views::View::FocusBehavior::ALWAYS);
  top_container()->parent()->AddChildView(unrelated_view);
  views::FocusManager* focus_manager =
      top_container()->GetWidget()->GetFocusManager();

  SetEnabled(true);

  // 1) Test that the top-of-window views stay revealed as long as either a
  // |child_view| has focus or the mouse is hovered above the top-of-window
  // views.
  AttemptReveal(MODALITY_MOUSE);
  child_view->RequestFocus();
  focus_manager->ClearFocus();
  EXPECT_TRUE(controller()->IsRevealed());
  child_view->RequestFocus();
  SetHovered(false);
  EXPECT_TRUE(controller()->IsRevealed());
  focus_manager->ClearFocus();
  EXPECT_FALSE(controller()->IsRevealed());

  // 2) Test that focusing |unrelated_view| hides the top-of-window views.
  AttemptReveal(MODALITY_MOUSE);
  child_view->RequestFocus();
  SetHovered(false);
  EXPECT_TRUE(controller()->IsRevealed());
  unrelated_view->RequestFocus();
  EXPECT_FALSE(controller()->IsRevealed());

  // 3) Test that a loss of focus of |child_view| to |unrelated_view|
  // while immersive mode is disabled is properly registered.
  AttemptReveal(MODALITY_MOUSE);
  child_view->RequestFocus();
  SetHovered(false);
  EXPECT_TRUE(controller()->IsRevealed());
  SetEnabled(false);
  EXPECT_FALSE(controller()->IsRevealed());
  unrelated_view->RequestFocus();
  SetEnabled(true);
  EXPECT_FALSE(controller()->IsRevealed());

  // Repeat test but with a revealed lock acquired when immersive mode is
  // disabled because the code path is different.
  AttemptReveal(MODALITY_MOUSE);
  child_view->RequestFocus();
  SetHovered(false);
  EXPECT_TRUE(controller()->IsRevealed());
  SetEnabled(false);
  std::unique_ptr<ImmersiveRevealedLock> lock(controller()->GetRevealedLock(
      ImmersiveFullscreenController::ANIMATE_REVEAL_NO));
  EXPECT_FALSE(controller()->IsRevealed());
  unrelated_view->RequestFocus();
  SetEnabled(true);
  EXPECT_TRUE(controller()->IsRevealed());
  lock.reset();
  EXPECT_FALSE(controller()->IsRevealed());
}

// Test how transient windows affect whether the top-of-window views are
// revealed.
TEST_F(ImmersiveFullscreenControllerTest, Transient) {
  views::Widget* top_container_widget = top_container()->GetWidget();

  SetEnabled(true);
  ASSERT_FALSE(controller()->IsRevealed());

  // 1) Test that a transient window which is not a bubble does not trigger a
  // reveal but does keep the top-of-window views revealed if they are already
  // revealed.
  views::Widget::InitParams transient_params;
  transient_params.ownership =
      views::Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
  transient_params.parent = top_container_widget->GetNativeView();
  transient_params.bounds = gfx::Rect(0, 100, 100, 100);
  std::unique_ptr<views::Widget> transient_widget(new views::Widget());
  transient_widget->Init(transient_params);

  EXPECT_FALSE(controller()->IsRevealed());
  AttemptReveal(MODALITY_MOUSE);
  EXPECT_TRUE(controller()->IsRevealed());
  transient_widget->Show();
  SetHovered(false);
  EXPECT_TRUE(controller()->IsRevealed());
  transient_widget.reset();
  EXPECT_FALSE(controller()->IsRevealed());

  // 2) Test that activating a non-transient window does not keep the
  // top-of-window views revealed.
  views::Widget::InitParams non_transient_params;
  non_transient_params.ownership =
      views::Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
  non_transient_params.bounds = gfx::Rect(0, 100, 100, 100);
  std::unique_ptr<views::Widget> non_transient_widget(new views::Widget());
  non_transient_params.context = CurrentContext();
  non_transient_widget->Init(non_transient_params);

  EXPECT_FALSE(controller()->IsRevealed());
  AttemptReveal(MODALITY_MOUSE);
  EXPECT_TRUE(controller()->IsRevealed());
  non_transient_widget->Show();
  SetHovered(false);
  EXPECT_FALSE(controller()->IsRevealed());
}

// Test how bubbles affect whether the top-of-window views are revealed.
TEST_F(ImmersiveFullscreenControllerTest, Bubbles) {
  std::unique_ptr<ImmersiveRevealedLock> revealed_lock;
  views::Widget* top_container_widget = top_container()->GetWidget();

  // Add views to the view hierarchy to which we will anchor bubbles.
  views::View* child_view = new views::View();
  child_view->SetBounds(0, 0, 10, 10);
  top_container()->AddChildView(child_view);
  views::View* unrelated_view = new views::View();
  unrelated_view->SetBounds(0, 100, 10, 10);
  top_container()->parent()->AddChildView(unrelated_view);

  SetEnabled(true);
  ASSERT_FALSE(controller()->IsRevealed());

  // 1) Test that a bubble anchored to a child of the top container triggers
  // a reveal and keeps the top-of-window views revealed for the duration of
  // its visibility.
  views::Widget* bubble_widget1(views::BubbleDialogDelegateView::CreateBubble(
      new TestBubbleDialogDelegate(child_view)));
  bubble_widget1->Show();
  EXPECT_TRUE(controller()->IsRevealed());

  // Activating |top_container_widget| will close |bubble_widget1|.
  top_container_widget->Activate();
  AttemptReveal(MODALITY_MOUSE);
  revealed_lock.reset(controller()->GetRevealedLock(
      ImmersiveFullscreenController::ANIMATE_REVEAL_NO));
  EXPECT_TRUE(controller()->IsRevealed());

  views::Widget* bubble_widget2 = views::BubbleDialogDelegateView::CreateBubble(
      new TestBubbleDialogDelegate(child_view));
  bubble_widget2->Show();
  EXPECT_TRUE(controller()->IsRevealed());
  revealed_lock.reset();
  SetHovered(false);
  EXPECT_TRUE(controller()->IsRevealed());
  bubble_widget2->Close();
  EXPECT_FALSE(controller()->IsRevealed());

  // 2) Test that transitioning from keeping the top-of-window views revealed
  // because of a bubble to keeping the top-of-window views revealed because of
  // mouse hover by activating |top_container_widget| works.
  views::Widget* bubble_widget3 = views::BubbleDialogDelegateView::CreateBubble(
      new TestBubbleDialogDelegate(child_view));
  bubble_widget3->Show();
  SetHovered(true);
  EXPECT_TRUE(controller()->IsRevealed());
  top_container_widget->Activate();
  EXPECT_TRUE(controller()->IsRevealed());

  // 3) Test that the top-of-window views stay revealed as long as at least one
  // bubble anchored to a child of the top container is visible.
  SetHovered(false);
  EXPECT_FALSE(controller()->IsRevealed());

  views::BubbleDialogDelegateView* bubble_delegate4(
      new TestBubbleDialogDelegate(child_view));
  bubble_delegate4->SetCanActivate(false);
  views::Widget* bubble_widget4(
      views::BubbleDialogDelegateView::CreateBubble(bubble_delegate4));
  bubble_widget4->Show();

  views::BubbleDialogDelegateView* bubble_delegate5(
      new TestBubbleDialogDelegate(child_view));
  bubble_delegate5->SetCanActivate(false);
  views::Widget* bubble_widget5(
      views::BubbleDialogDelegateView::CreateBubble(bubble_delegate5));
  bubble_widget5->Show();

  EXPECT_TRUE(controller()->IsRevealed());
  bubble_widget4->Hide();
  EXPECT_TRUE(controller()->IsRevealed());
  bubble_widget5->Hide();
  EXPECT_FALSE(controller()->IsRevealed());
  bubble_widget5->Show();
  EXPECT_TRUE(controller()->IsRevealed());

  // 4) Test that visibility changes which occur while immersive fullscreen is
  // disabled are handled upon reenabling immersive fullscreen.
  SetEnabled(false);
  bubble_widget5->Hide();
  SetEnabled(true);
  EXPECT_FALSE(controller()->IsRevealed());

  // We do not need |bubble_widget4| or |bubble_widget5| anymore, close them.
  bubble_widget4->Close();
  bubble_widget5->Close();

  // 5) Test that a bubble added while immersive fullscreen is disabled is
  // handled upon reenabling immersive fullscreen.
  SetEnabled(false);

  views::Widget* bubble_widget6 = views::BubbleDialogDelegateView::CreateBubble(
      new TestBubbleDialogDelegate(child_view));
  bubble_widget6->Show();

  SetEnabled(true);
  EXPECT_TRUE(controller()->IsRevealed());

  bubble_widget6->Close();

  // 6) Test that a bubble which is not anchored to a child of the
  // TopContainerView does not trigger a reveal or keep the
  // top-of-window views revealed if they are already revealed.
  views::Widget* bubble_widget7 = views::BubbleDialogDelegateView::CreateBubble(
      new TestBubbleDialogDelegate(unrelated_view));
  bubble_widget7->Show();
  EXPECT_FALSE(controller()->IsRevealed());

  // Activating |top_container_widget| will close |bubble_widget6|.
  top_container_widget->Activate();
  AttemptReveal(MODALITY_MOUSE);
  EXPECT_TRUE(controller()->IsRevealed());

  views::Widget* bubble_widget8 = views::BubbleDialogDelegateView::CreateBubble(
      new TestBubbleDialogDelegate(unrelated_view));
  bubble_widget8->Show();
  SetHovered(false);
  EXPECT_FALSE(controller()->IsRevealed());
  bubble_widget8->Close();
}

// Test that the shelf is set to auto hide as long as the window is in
// immersive fullscreen and that the shelf's state before entering immersive
// fullscreen is restored upon exiting immersive fullscreen.
TEST_F(ImmersiveFullscreenControllerTest, Shelf) {
  Shelf* shelf = GetPrimaryShelf();

  // Shelf is visible by default.
  SetWindowShowState(ui::SHOW_STATE_NORMAL);
  ASSERT_FALSE(controller()->IsEnabled());
  ASSERT_EQ(SHELF_VISIBLE, shelf->GetVisibilityState());

  // Entering immersive fullscreen sets the shelf to auto hide.
  SetWindowShowState(ui::SHOW_STATE_FULLSCREEN);
  SetEnabled(true);
  EXPECT_EQ(SHELF_AUTO_HIDE, shelf->GetVisibilityState());

  // Disabling immersive fullscreen puts it back.
  SetEnabled(false);
  SetWindowShowState(ui::SHOW_STATE_NORMAL);
  ASSERT_FALSE(controller()->IsEnabled());
  EXPECT_EQ(SHELF_VISIBLE, shelf->GetVisibilityState());

  // The user could toggle the shelf auto-hide behavior.
  shelf->SetAutoHideBehavior(SHELF_AUTO_HIDE_BEHAVIOR_ALWAYS);
  EXPECT_EQ(SHELF_AUTO_HIDE, shelf->GetVisibilityState());

  // Entering immersive fullscreen keeps auto-hide.
  SetWindowShowState(ui::SHOW_STATE_FULLSCREEN);
  SetEnabled(true);
  EXPECT_EQ(SHELF_AUTO_HIDE, shelf->GetVisibilityState());

  // Disabling immersive fullscreen maintains the user's auto-hide selection.
  SetEnabled(false);
  SetWindowShowState(ui::SHOW_STATE_NORMAL);
  EXPECT_EQ(SHELF_AUTO_HIDE, shelf->GetVisibilityState());
}

}  // namespase ash