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

#include "chrome/browser/ui/views/exclusive_access_bubble_views.h"

#include <utility>

#include "base/i18n/case_conversion.h"
#include "base/location.h"
#include "base/strings/utf_string_conversions.h"
#include "base/task/single_thread_task_runner.h"
#include "build/build_config.h"
#include "chrome/app/chrome_command_ids.h"
#include "chrome/browser/ui/browser_element_identifiers.h"
#include "chrome/browser/ui/exclusive_access/exclusive_access_manager.h"
#include "chrome/browser/ui/exclusive_access/fullscreen_controller.h"
#include "chrome/browser/ui/ui_features.h"
#include "chrome/browser/ui/views/exclusive_access_bubble_views_context.h"
#include "chrome/browser/ui/views/frame/immersive_mode_controller.h"
#include "chrome/browser/ui/views/frame/top_container_view.h"
#include "chrome/grit/generated_resources.h"
#include "components/fullscreen_control/subtle_notification_view.h"
#include "content/public/browser/web_contents.h"
#include "ui/accessibility/ax_enums.mojom.h"
#include "ui/accessibility/ax_node_data.h"
#include "ui/base/l10n/l10n_util.h"
#include "ui/events/keycodes/keyboard_codes.h"
#include "ui/gfx/animation/slide_animation.h"
#include "ui/strings/grit/ui_strings.h"
#include "ui/views/view.h"
#include "ui/views/view_class_properties.h"
#include "ui/views/widget/widget.h"
#include "url/origin.h"

#if BUILDFLAG(IS_WIN)
#include "ui/base/l10n/l10n_util_win.h"
#endif

namespace {

// Returns whether `type` indicates a tab-initiated fullscreen mode.
bool IsTabFullscreenType(ExclusiveAccessBubbleType type) {
  return type == EXCLUSIVE_ACCESS_BUBBLE_TYPE_FULLSCREEN_EXIT_INSTRUCTION ||
         type ==
             EXCLUSIVE_ACCESS_BUBBLE_TYPE_FULLSCREEN_POINTERLOCK_EXIT_INSTRUCTION ||
         type == EXCLUSIVE_ACCESS_BUBBLE_TYPE_KEYBOARD_LOCK_EXIT_INSTRUCTION;
}

}  // namespace

ExclusiveAccessBubbleViews::ExclusiveAccessBubbleViews(
    ExclusiveAccessBubbleViewsContext* context,
    const ExclusiveAccessBubbleParams& params,
    ExclusiveAccessBubbleHideCallback first_hide_callback)
    : ExclusiveAccessBubble(params),
      bubble_view_context_(context),
      first_hide_callback_(std::move(first_hide_callback)),
      animation_(new gfx::SlideAnimation(this)) {
  // Create the contents view.
  auto content_view = std::make_unique<SubtleNotificationView>();
  view_ = content_view.get();
  view_->SetProperty(views::kElementIdentifierKey,
                     kExclusiveAccessBubbleViewElementId);

#if BUILDFLAG(IS_CHROMEOS)
  // Technically the exit fullscreen key on ChromeOS is F11 and the
  // "Fullscreen" key on the keyboard is just translated to F11 or F4 (which
  // is also a toggle-fullscreen command on ChromeOS). However most Chromebooks
  // have media keys - including "fullscreen" - but not function keys, so
  // instructing the user to "Press [F11] to exit fullscreen" isn't useful.
  //
  // An obvious solution might be to change the primary accelerator to the
  // fullscreen key, but since translation to a function key is done at system
  // level we can't actually do that. Instead we provide specific messaging for
  // the platform here. (See crbug.com/1110468 for details.)
  browser_fullscreen_exit_accelerator_ =
      l10n_util::GetStringUTF16(IDS_APP_FULLSCREEN_KEY);
#else
  ui::Accelerator accelerator(ui::VKEY_UNKNOWN, ui::EF_NONE);
  bool got_accelerator =
      bubble_view_context_->GetAcceleratorProvider()
          ->GetAcceleratorForCommandId(IDC_FULLSCREEN, &accelerator);
  DCHECK(got_accelerator);
  browser_fullscreen_exit_accelerator_ = accelerator.GetShortcutText();
#endif

  UpdateViewContent(params_.type);

  // Initialize the popup.
  popup_ = SubtleNotificationView::CreatePopupWidget(
      bubble_view_context_->GetBubbleParentView(), std::move(content_view));

  gfx::Rect popup_rect = GetPopupRect();
  gfx::Size size = popup_rect.size();
  // Bounds are in screen coordinates.
  popup_->SetBounds(popup_rect);
  // Why is this special enough to require the "security surface" level? A
  // decision was made a long time ago to not require confirmation when a site
  // asks to go fullscreen, and that's not changing. However, a site going
  // fullscreen is a big security risk, allowing phishing and other UI fakery.
  // This bubble is the only defense that Chromium can provide against this
  // attack, so it's important to order it above everything.
  //
  // On some platforms, pages can put themselves into fullscreen and then
  // trigger other elements to cover up this bubble, elements that aren't fully
  // under Chromium's control. See https://crbug.com/927150 for an example.
  popup_->SetZOrderLevel(ui::ZOrderLevel::kSecuritySurface);
  view_->SetBounds(0, 0, size.width(), size.height());
  popup_->AddObserver(this);

  ShowAndStartTimers();

  const bool entering_tab_fullscreen = IsTabFullscreenType(params.type);
  // If the tab enters fullscreen without any recent user interaction, re-show
  // the bubble on the first user input event, by clearing the snooze time.
  content::WebContents* tab = bubble_view_context_->GetExclusiveAccessManager()
                                  ->fullscreen_controller()
                                  ->exclusive_access_tab();
  if (entering_tab_fullscreen && tab && !tab->HasRecentInteraction()) {
    snooze_until_ = base::TimeTicks::Min();
  }
}

ExclusiveAccessBubbleViews::~ExclusiveAccessBubbleViews() {
  RunHideCallbackIfNeeded(ExclusiveAccessBubbleHideReason::kInterrupted);

  popup_->RemoveObserver(this);

  // This is tricky.  We may be in an ATL message handler stack, in which case
  // the popup cannot be deleted yet.  We also can't set the popup's ownership
  // model to NATIVE_WIDGET_OWNS_WIDGET because if the user closed the last tab
  // while in fullscreen mode, Windows has already destroyed the popup HWND by
  // the time we get here, and thus either the popup will already have been
  // deleted (if we set this in our constructor) or the popup will never get
  // another OnFinalMessage() call (if not, as currently).  So instead, we tell
  // the popup to synchronously hide, and then asynchronously close and delete
  // itself.
  popup_->Close();
  base::SingleThreadTaskRunner::GetCurrentDefault()->DeleteSoon(FROM_HERE,
                                                                popup_.get());
  CHECK(!views::WidgetObserver::IsInObserverList());
}

void ExclusiveAccessBubbleViews::Update(
    const ExclusiveAccessBubbleParams& params,
    ExclusiveAccessBubbleHideCallback first_hide_callback) {
  DCHECK(EXCLUSIVE_ACCESS_BUBBLE_TYPE_NONE != params.type ||
         params.has_download);
  bool already_shown = IsShowing() || IsVisible();
  if (params_.type == params.type && params_.origin == params.origin &&
      !params.force_update && already_shown) {
    return;
  }

  // Show the notification about overriding only if:
  // 1. There was a notification visible earlier, and
  // 2. Exactly one of the previous and current notifications has a download,
  //    or the previous notification was about an override itself.
  // If both the previous and current notifications have a download, but
  // neither is an override, then we don't need to show an override.
  notify_overridden_ =
      already_shown &&
      (notify_overridden_ || (params.has_download ^ params_.has_download));
  params_.has_download = params.has_download || notify_overridden_;

  // Bubble maybe be re-used after timeout.
  RunHideCallbackIfNeeded(ExclusiveAccessBubbleHideReason::kInterrupted);

  first_hide_callback_ = std::move(first_hide_callback);

  const bool entering_tab_fullscreen =
      !IsTabFullscreenType(params_.type) && IsTabFullscreenType(params.type);

  params_.origin = params.origin;
  // When a request to notify about a download is made, the bubble type
  // should be preserved from the old value, and not be updated.
  if (!params.has_download) {
    params_.type = params.type;
  }
  UpdateViewContent(params_.type);
  view_->SizeToPreferredSize();
  popup_->SetBounds(GetPopupRect());
  ShowAndStartTimers();

  // If the tab enters fullscreen without any recent user interaction, re-show
  // the bubble on the first user input event, by clearing the snooze time.
  content::WebContents* tab = bubble_view_context_->GetExclusiveAccessManager()
                                  ->fullscreen_controller()
                                  ->exclusive_access_tab();
  if (entering_tab_fullscreen && tab && !tab->HasRecentInteraction()) {
    snooze_until_ = base::TimeTicks::Min();
  }
}

void ExclusiveAccessBubbleViews::RepositionIfVisible() {
  if (IsVisible()) {
    UpdateBounds();
  }
}

void ExclusiveAccessBubbleViews::HideImmediately() {
  if (!IsShowing() && !popup_->IsVisible()) {
    return;
  }

  RunHideCallbackIfNeeded(ExclusiveAccessBubbleHideReason::kInterrupted);

  animation_->SetSlideDuration(base::Milliseconds(150));
  animation_->Hide();
}

bool ExclusiveAccessBubbleViews::IsShowing() const {
  return animation_->is_animating() && animation_->IsShowing();
}

views::View* ExclusiveAccessBubbleViews::GetView() {
  return view_;
}

void ExclusiveAccessBubbleViews::UpdateBounds() {
  gfx::Rect popup_rect(GetPopupRect());
  if (!popup_rect.IsEmpty()) {
    popup_->SetBounds(popup_rect);
    view_->SetY(popup_rect.height() - view_->height());
  }
}

void ExclusiveAccessBubbleViews::UpdateViewContent(
    ExclusiveAccessBubbleType bubble_type) {
  DCHECK(params_.has_download ||
         EXCLUSIVE_ACCESS_BUBBLE_TYPE_NONE != bubble_type);

  std::u16string accelerator;
  bool should_show_browser_acc =
      (params_.has_download &&
       bubble_type == EXCLUSIVE_ACCESS_BUBBLE_TYPE_NONE) ||
      exclusive_access_bubble::IsExclusiveAccessModeBrowserFullscreen(
          bubble_type);
  if (should_show_browser_acc &&
      !base::FeatureList::IsEnabled(
          features::kPressAndHoldEscToExitBrowserFullscreen)) {
    accelerator = browser_fullscreen_exit_accelerator_;
  } else {
    accelerator = l10n_util::GetStringUTF16(IDS_APP_ESC_KEY);

#if BUILDFLAG(IS_MAC)
    // Mac keyboards use lowercase for the non-letter keys, and since the key is
    // placed in a box to make it look like a keyboard key it looks weird to not
    // follow suit.
    accelerator = base::i18n::ToLower(accelerator);
#endif
  }
  // This string *may* contain the name of the key surrounded in pipe characters
  // ('|'), which should be drawn graphically as a key, not displayed literally.
  // `accelerator` is the name of the key to exit fullscreen mode.
  view_->UpdateContent(exclusive_access_bubble::GetInstructionTextForType(
      params_.type, accelerator, params_.origin, params_.has_download,
      notify_overridden_));
}

bool ExclusiveAccessBubbleViews::IsVisible() const {
#if BUILDFLAG(IS_MAC)
  // Due to a quirk on the Mac, the popup will not be visible for a short period
  // of time after it is shown (it's asynchronous) so if we don't check the
  // value of the animation we'll have a stale version of the bounds when we
  // show it and it will appear in the wrong place - typically where the window
  // was located before going to fullscreen.
  return (popup_->IsVisible() || animation_->GetCurrentValue() > 0.0);
#else
  return (popup_->IsVisible());
#endif
}

void ExclusiveAccessBubbleViews::AnimationProgressed(
    const gfx::Animation* animation) {
  float opacity = static_cast<float>(animation_->CurrentValueBetween(0.0, 1.0));
  if (opacity == 0) {
    popup_->Hide();
  } else {
    popup_->Show();
    popup_->SetOpacity(opacity);
  }
}

void ExclusiveAccessBubbleViews::AnimationEnded(
    const gfx::Animation* animation) {
  if (animation_->IsShowing()) {
    GetView()->NotifyAccessibilityEventDeprecated(ax::mojom::Event::kAlert,
                                                  true);
  }
  AnimationProgressed(animation);
}

gfx::Rect ExclusiveAccessBubbleViews::GetPopupRect() const {
  gfx::Size size(view_->GetPreferredSize());
  gfx::Rect widget_bounds = bubble_view_context_->GetClientAreaBoundsInScreen();
  int x = widget_bounds.x() + (widget_bounds.width() - size.width()) / 2;

  int top_container_bottom = widget_bounds.y();
#if !BUILDFLAG(IS_MAC)
  if (bubble_view_context_->IsImmersiveModeEnabled()) {
    // Skip querying the top container height in CrOS non-immersive fullscreen
    // because:
    // - The top container height is always zero in non-immersive fullscreen.
    // - Querying the top container height may return the height before entering
    //   fullscreen because layout is disabled while entering fullscreen.
    // A visual glitch due to the delayed layout is avoided in immersive
    // fullscreen because entering fullscreen starts with the top container
    // revealed. When revealed, the top container has the same height as before
    // entering fullscreen.
    top_container_bottom =
        bubble_view_context_->GetTopContainerBoundsInScreen().bottom();
  }
#endif
  // Space between top of screen and popup.
  static constexpr int kPopupTopPx = 45;
  // |desired_top| is the top of the bubble area including the shadow.
  const int desired_top = kPopupTopPx - view_->GetInsets().top();
  const int y = top_container_bottom + desired_top;

  return gfx::Rect(gfx::Point(x, y), size);
}

void ExclusiveAccessBubbleViews::Hide() {
  // This function is guarded by the `ExclusiveAccessBubble::hide_timeout_`
  // timer, so the bubble has been displayed for at least
  // `ExclusiveAccessBubble::kShowTime`.
  DCHECK(!hide_timeout_.IsRunning());
  RunHideCallbackIfNeeded(ExclusiveAccessBubbleHideReason::kTimeout);

  animation_->SetSlideDuration(base::Milliseconds(700));
  animation_->Hide();
}

void ExclusiveAccessBubbleViews::Show() {
  if (animation_->IsShowing()) {
    return;
  }
  animation_->SetSlideDuration(base::Milliseconds(350));
  animation_->Show();
}

void ExclusiveAccessBubbleViews::OnWidgetDestroyed(views::Widget* widget) {
  // Although SubtleNotificationView uses WIDGET_OWNS_NATIVE_WIDGET, a close can
  // originate from the OS or some Chrome shutdown codepaths that bypass the
  // destructor.
  views::Widget* popup_on_stack = popup_;
  DCHECK(popup_on_stack->HasObserver(this));

  // Get ourselves destroyed. Calling ExitExclusiveAccess() won't work because
  // the parent window might be destroyed as well, so asking it to exit
  // fullscreen would be a bad idea.
  bubble_view_context_->DestroyAnyExclusiveAccessBubble();

  // Note: |this| is destroyed on the line above. Check that the destructor was
  // invoked. This is safe to do since |popup_| is deleted via a posted task.
  DCHECK(!popup_on_stack->HasObserver(this));
}

void ExclusiveAccessBubbleViews::RunHideCallbackIfNeeded(
    ExclusiveAccessBubbleHideReason reason) {
  if (first_hide_callback_) {
    std::move(first_hide_callback_).Run(reason);
  }
}