// 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 "ash/system/web_notification/web_notification_tray.h"

#include "ash/ash_switches.h"
#include "ash/root_window_controller.h"
#include "ash/shelf/shelf_layout_manager.h"
#include "ash/shelf/shelf_layout_manager_observer.h"
#include "ash/shelf/shelf_widget.h"
#include "ash/shell.h"
#include "ash/shell_window_ids.h"
#include "ash/system/status_area_widget.h"
#include "ash/system/tray/system_tray.h"
#include "ash/system/tray/tray_background_view.h"
#include "ash/system/tray/tray_bubble_wrapper.h"
#include "ash/system/tray/tray_constants.h"
#include "ash/system/tray/tray_utils.h"
#include "base/auto_reset.h"
#include "base/i18n/number_formatting.h"
#include "base/i18n/rtl.h"
#include "base/strings/utf_string_conversions.h"
#include "grit/ash_strings.h"
#include "grit/ui_strings.h"
#include "ui/aura/window.h"
#include "ui/aura/window_event_dispatcher.h"
#include "ui/base/l10n/l10n_util.h"
#include "ui/gfx/screen.h"
#include "ui/message_center/message_center_style.h"
#include "ui/message_center/message_center_tray_delegate.h"
#include "ui/message_center/views/message_bubble_base.h"
#include "ui/message_center/views/message_center_bubble.h"
#include "ui/message_center/views/message_popup_collection.h"
#include "ui/views/bubble/tray_bubble_view.h"
#include "ui/views/controls/button/custom_button.h"
#include "ui/views/controls/image_view.h"
#include "ui/views/controls/label.h"
#include "ui/views/controls/menu/menu_runner.h"
#include "ui/views/layout/fill_layout.h"

#if defined(OS_CHROMEOS)

namespace message_center {

MessageCenterTrayDelegate* CreateMessageCenterTray() {
  // On Windows+Ash the Tray will not be hosted in ash::Shell.
  NOTREACHED();
  return NULL;
}

}  // namespace message_center

#endif  // defined(OS_CHROMEOS)

namespace ash {
namespace {

// Menu commands
const int kToggleQuietMode = 0;
const int kEnableQuietModeDay = 2;

}

namespace {

const SkColor kWebNotificationColorNoUnread = SkColorSetA(SK_ColorWHITE, 128);
const SkColor kWebNotificationColorWithUnread = SK_ColorWHITE;

}

// Observes the change of work area (including temporary change by auto-hide)
// and notifies MessagePopupCollection.
class WorkAreaObserver : public ShelfLayoutManagerObserver,
                         public ShellObserver {
 public:
  WorkAreaObserver();
  virtual ~WorkAreaObserver();

  void SetSystemTrayHeight(int height);

  // Starts observing |shelf| and shell and sends the change to |collection|.
  void StartObserving(message_center::MessagePopupCollection* collection,
                      aura::Window* root_window);

  // Stops the observing session.
  void StopObserving();

  // Overridden from ShellObserver:
  virtual void OnDisplayWorkAreaInsetsChanged() OVERRIDE;

  // Overridden from ShelfLayoutManagerObserver:
  virtual void OnAutoHideStateChanged(ShelfAutoHideState new_state) OVERRIDE;

 private:
  // Updates |shelf_| from |root_window_|.
  void UpdateShelf();

  message_center::MessagePopupCollection* collection_;
  aura::Window* root_window_;
  ShelfLayoutManager* shelf_;
  int system_tray_height_;

  DISALLOW_COPY_AND_ASSIGN(WorkAreaObserver);
};

WorkAreaObserver::WorkAreaObserver()
    : collection_(NULL),
      root_window_(NULL),
      shelf_(NULL),
      system_tray_height_(0) {
}

WorkAreaObserver::~WorkAreaObserver() {
  StopObserving();
}

void WorkAreaObserver::SetSystemTrayHeight(int height) {
  system_tray_height_ = height;

  // If the shelf is shown during auto-hide state, the distance from the edge
  // should be reduced by the height of shelf's shown height.
  if (shelf_ && shelf_->visibility_state() == SHELF_AUTO_HIDE &&
      shelf_->auto_hide_state() == SHELF_AUTO_HIDE_SHOWN) {
    system_tray_height_ -= kShelfSize - ShelfLayoutManager::kAutoHideSize;
  }

  if (system_tray_height_ > 0)
    system_tray_height_ += message_center::kMarginBetweenItems;

  if (!shelf_)
    return;

  OnAutoHideStateChanged(shelf_->auto_hide_state());
}

void WorkAreaObserver::StartObserving(
    message_center::MessagePopupCollection* collection,
    aura::Window* root_window) {
  DCHECK(collection);
  collection_ = collection;
  root_window_ = root_window;
  UpdateShelf();
  Shell::GetInstance()->AddShellObserver(this);
  if (system_tray_height_ > 0)
    OnAutoHideStateChanged(shelf_->auto_hide_state());
}

void WorkAreaObserver::StopObserving() {
  Shell::GetInstance()->RemoveShellObserver(this);
  if (shelf_)
    shelf_->RemoveObserver(this);
  collection_ = NULL;
  shelf_ = NULL;
}

void WorkAreaObserver::OnDisplayWorkAreaInsetsChanged() {
  UpdateShelf();

  collection_->OnDisplayBoundsChanged(
      Shell::GetScreen()->GetDisplayNearestWindow(
          shelf_->shelf_widget()->GetNativeView()));
}

void WorkAreaObserver::OnAutoHideStateChanged(ShelfAutoHideState new_state) {
  gfx::Display display = Shell::GetScreen()->GetDisplayNearestWindow(
      shelf_->shelf_widget()->GetNativeView());
  gfx::Rect work_area = display.work_area();
  int width = 0;
  if ((shelf_->visibility_state() == SHELF_AUTO_HIDE) &&
      new_state == SHELF_AUTO_HIDE_SHOWN) {
    // Since the work_area is already reduced by kAutoHideSize, the inset width
    // should be just the difference.
    width = kShelfSize - ShelfLayoutManager::kAutoHideSize;
  }
  work_area.Inset(shelf_->SelectValueForShelfAlignment(
      gfx::Insets(0, 0, width, 0),
      gfx::Insets(0, width, 0, 0),
      gfx::Insets(0, 0, 0, width),
      gfx::Insets(width, 0, 0, 0)));
  if (system_tray_height_ > 0) {
    work_area.set_height(
        std::max(0, work_area.height() - system_tray_height_));
    if (shelf_->GetAlignment() == SHELF_ALIGNMENT_TOP)
      work_area.set_y(work_area.y() + system_tray_height_);
  }
  collection_->SetDisplayInfo(work_area, display.bounds());
}

void WorkAreaObserver::UpdateShelf() {
  if (shelf_)
    return;

  shelf_ = ShelfLayoutManager::ForShelf(root_window_);
  if (shelf_)
    shelf_->AddObserver(this);
}

// Class to initialize and manage the WebNotificationBubble and
// TrayBubbleWrapper instances for a bubble.
class WebNotificationBubbleWrapper {
 public:
  // Takes ownership of |bubble| and creates |bubble_wrapper_|.
  WebNotificationBubbleWrapper(WebNotificationTray* tray,
                               message_center::MessageBubbleBase* bubble) {
    bubble_.reset(bubble);
    views::TrayBubbleView::AnchorAlignment anchor_alignment =
        tray->GetAnchorAlignment();
    views::TrayBubbleView::InitParams init_params =
        bubble->GetInitParams(anchor_alignment);
    views::View* anchor = tray->tray_container();
    if (anchor_alignment == views::TrayBubbleView::ANCHOR_ALIGNMENT_BOTTOM) {
      gfx::Point bounds(anchor->width() / 2, 0);
      views::View::ConvertPointToWidget(anchor, &bounds);
      init_params.arrow_offset = bounds.x();
    }
    views::TrayBubbleView* bubble_view = views::TrayBubbleView::Create(
        tray->GetBubbleWindowContainer(), anchor, tray, &init_params);
    bubble_view->SetArrowPaintType(views::BubbleBorder::PAINT_NONE);
    bubble_wrapper_.reset(new TrayBubbleWrapper(tray, bubble_view));
    bubble->InitializeContents(bubble_view);
  }

  message_center::MessageBubbleBase* bubble() const { return bubble_.get(); }

  // Convenience accessors.
  views::TrayBubbleView* bubble_view() const { return bubble_->bubble_view(); }

 private:
  scoped_ptr<message_center::MessageBubbleBase> bubble_;
  scoped_ptr<TrayBubbleWrapper> bubble_wrapper_;

  DISALLOW_COPY_AND_ASSIGN(WebNotificationBubbleWrapper);
};

class WebNotificationButton : public views::CustomButton {
 public:
  WebNotificationButton(views::ButtonListener* listener)
      : views::CustomButton(listener),
        is_bubble_visible_(false),
        unread_count_(0) {
    SetLayoutManager(new views::FillLayout);
    unread_label_ = new views::Label();
    SetupLabelForTray(unread_label_);
    AddChildView(unread_label_);
  }

  void SetBubbleVisible(bool visible) {
    if (visible == is_bubble_visible_)
      return;

    is_bubble_visible_ = visible;
    UpdateIconVisibility();
  }

  void SetUnreadCount(int unread_count) {
    // base::FormatNumber doesn't convert to arabic numeric characters.
    // TODO(mukai): use ICU to support conversion for such locales.
    unread_count_ = unread_count;
    // TODO(mukai): move NINE_PLUS message to ui_strings, it doesn't need to be
    // in ash_strings.
    unread_label_->SetText((unread_count > 9) ?
        l10n_util::GetStringUTF16(IDS_ASH_NOTIFICATION_UNREAD_COUNT_NINE_PLUS) :
        base::FormatNumber(unread_count));
    UpdateIconVisibility();
  }

 protected:
  // Overridden from views::ImageButton:
  virtual gfx::Size GetPreferredSize() OVERRIDE {
    return gfx::Size(kShelfItemHeight, kShelfItemHeight);
  }

  virtual int GetHeightForWidth(int width) OVERRIDE {
    return GetPreferredSize().height();
  }

 private:
  void UpdateIconVisibility() {
    unread_label_->SetEnabledColor(
        (!is_bubble_visible_ && unread_count_ > 0) ?
        kWebNotificationColorWithUnread : kWebNotificationColorNoUnread);
    SchedulePaint();
  }

  bool is_bubble_visible_;
  int unread_count_;

  views::Label* unread_label_;

  DISALLOW_COPY_AND_ASSIGN(WebNotificationButton);
};

WebNotificationTray::WebNotificationTray(StatusAreaWidget* status_area_widget)
    : TrayBackgroundView(status_area_widget),
      button_(NULL),
      show_message_center_on_unlock_(false),
      should_update_tray_content_(false),
      should_block_shelf_auto_hide_(false) {
  button_ = new WebNotificationButton(this);
  button_->set_triggerable_event_flags(
      ui::EF_LEFT_MOUSE_BUTTON | ui::EF_RIGHT_MOUSE_BUTTON);
  tray_container()->AddChildView(button_);
  SetContentsBackground();
  tray_container()->SetBorder(views::Border::NullBorder());
  SetVisible(false);
  message_center_tray_.reset(new message_center::MessageCenterTray(
      this,
      message_center::MessageCenter::Get()));
  popup_collection_.reset(new message_center::MessagePopupCollection(
      ash::Shell::GetContainer(
          status_area_widget->GetNativeView()->GetRootWindow(),
          kShellWindowId_StatusContainer),
      message_center(),
      message_center_tray_.get(),
      true));
  work_area_observer_.reset(new WorkAreaObserver());
  work_area_observer_->StartObserving(
      popup_collection_.get(),
      status_area_widget->GetNativeView()->GetRootWindow());
  OnMessageCenterTrayChanged();
}

WebNotificationTray::~WebNotificationTray() {
  // Release any child views that might have back pointers before ~View().
  message_center_bubble_.reset();
  popup_collection_.reset();
  work_area_observer_.reset();
}

// Public methods.

bool WebNotificationTray::ShowMessageCenterInternal(bool show_settings) {
  if (!ShouldShowMessageCenter())
    return false;

  should_block_shelf_auto_hide_ = true;
  message_center::MessageCenterBubble* message_center_bubble =
      new message_center::MessageCenterBubble(
          message_center(),
          message_center_tray_.get(),
          true);

  int max_height = 0;
  aura::Window* status_area_window = status_area_widget()->GetNativeView();
  switch (GetShelfLayoutManager()->GetAlignment()) {
    case SHELF_ALIGNMENT_BOTTOM: {
      gfx::Rect shelf_bounds = GetShelfLayoutManager()->GetIdealBounds();
      max_height = shelf_bounds.y();
      break;
    }
    case SHELF_ALIGNMENT_TOP: {
      aura::Window* root = status_area_window->GetRootWindow();
      max_height =
          root->bounds().height() - status_area_window->bounds().height();
      break;
    }
    case SHELF_ALIGNMENT_LEFT:
    case SHELF_ALIGNMENT_RIGHT: {
      // Assume that the bottom line of the status area widget and the bubble
      // are aligned.
      max_height = status_area_window->GetBoundsInRootWindow().bottom();
      break;
    }
    default:
      NOTREACHED();
  }

  message_center_bubble->SetMaxHeight(std::max(0,
                                               max_height - kTraySpacing));
  if (show_settings)
    message_center_bubble->SetSettingsVisible();
  message_center_bubble_.reset(
      new WebNotificationBubbleWrapper(this, message_center_bubble));

  status_area_widget()->SetHideSystemNotifications(true);
  GetShelfLayoutManager()->UpdateAutoHideState();
  button_->SetBubbleVisible(true);
  SetDrawBackgroundAsActive(true);
  return true;
}

bool WebNotificationTray::ShowMessageCenter() {
  return ShowMessageCenterInternal(false /* show_settings */);
}

void WebNotificationTray::HideMessageCenter() {
  if (!message_center_bubble())
    return;
  SetDrawBackgroundAsActive(false);
  message_center_bubble_.reset();
  should_block_shelf_auto_hide_ = false;
  show_message_center_on_unlock_ = false;
  status_area_widget()->SetHideSystemNotifications(false);
  GetShelfLayoutManager()->UpdateAutoHideState();
  button_->SetBubbleVisible(false);
}

void WebNotificationTray::SetSystemTrayHeight(int height) {
  work_area_observer_->SetSystemTrayHeight(height);
}

bool WebNotificationTray::ShowPopups() {
  if (message_center_bubble())
    return false;

  popup_collection_->DoUpdateIfPossible();
  return true;
}

void WebNotificationTray::HidePopups() {
  DCHECK(popup_collection_.get());
  popup_collection_->MarkAllPopupsShown();
}

// Private methods.

bool WebNotificationTray::ShouldShowMessageCenter() {
  return status_area_widget()->login_status() != user::LOGGED_IN_LOCKED &&
      !(status_area_widget()->system_tray() &&
        status_area_widget()->system_tray()->HasNotificationBubble());
}

bool WebNotificationTray::ShouldBlockShelfAutoHide() const {
  return should_block_shelf_auto_hide_;
}

bool WebNotificationTray::IsMessageCenterBubbleVisible() const {
  return (message_center_bubble() &&
          message_center_bubble()->bubble()->IsVisible());
}

bool WebNotificationTray::IsMouseInNotificationBubble() const {
  return false;
}

void WebNotificationTray::ShowMessageCenterBubble() {
  if (!IsMessageCenterBubbleVisible())
    message_center_tray_->ShowMessageCenterBubble();
}

void WebNotificationTray::UpdateAfterLoginStatusChange(
    user::LoginStatus login_status) {
  OnMessageCenterTrayChanged();
}

void WebNotificationTray::SetShelfAlignment(ShelfAlignment alignment) {
  if (alignment == shelf_alignment())
    return;
  TrayBackgroundView::SetShelfAlignment(alignment);
  tray_container()->SetBorder(views::Border::NullBorder());
  // Destroy any existing bubble so that it will be rebuilt correctly.
  message_center_tray_->HideMessageCenterBubble();
  message_center_tray_->HidePopupBubble();
}

void WebNotificationTray::AnchorUpdated() {
  if (message_center_bubble()) {
    message_center_bubble()->bubble_view()->UpdateBubble();
    UpdateBubbleViewArrow(message_center_bubble()->bubble_view());
  }
}

base::string16 WebNotificationTray::GetAccessibleNameForTray() {
  return l10n_util::GetStringUTF16(
      IDS_MESSAGE_CENTER_ACCESSIBLE_NAME);
}

void WebNotificationTray::HideBubbleWithView(
    const views::TrayBubbleView* bubble_view) {
  if (message_center_bubble() &&
      bubble_view == message_center_bubble()->bubble_view()) {
    message_center_tray_->HideMessageCenterBubble();
  } else if (popup_collection_.get()) {
    message_center_tray_->HidePopupBubble();
  }
}

bool WebNotificationTray::PerformAction(const ui::Event& event) {
  if (message_center_bubble())
    message_center_tray_->HideMessageCenterBubble();
  else
    message_center_tray_->ShowMessageCenterBubble();
  return true;
}

void WebNotificationTray::BubbleViewDestroyed() {
  if (message_center_bubble())
    message_center_bubble()->bubble()->BubbleViewDestroyed();
}

void WebNotificationTray::OnMouseEnteredView() {}

void WebNotificationTray::OnMouseExitedView() {}

base::string16 WebNotificationTray::GetAccessibleNameForBubble() {
  return GetAccessibleNameForTray();
}

gfx::Rect WebNotificationTray::GetAnchorRect(
    views::Widget* anchor_widget,
    views::TrayBubbleView::AnchorType anchor_type,
    views::TrayBubbleView::AnchorAlignment anchor_alignment) {
  return GetBubbleAnchorRect(anchor_widget, anchor_type, anchor_alignment);
}

void WebNotificationTray::HideBubble(const views::TrayBubbleView* bubble_view) {
  HideBubbleWithView(bubble_view);
}

bool WebNotificationTray::ShowNotifierSettings() {
  if (message_center_bubble()) {
    static_cast<message_center::MessageCenterBubble*>(
        message_center_bubble()->bubble())->SetSettingsVisible();
    return true;
  }
  return ShowMessageCenterInternal(true /* show_settings */);
}

bool WebNotificationTray::IsContextMenuEnabled() const {
  user::LoginStatus login_status = status_area_widget()->login_status();
  return login_status != user::LOGGED_IN_NONE
      && login_status != user::LOGGED_IN_LOCKED;
}

message_center::MessageCenterTray* WebNotificationTray::GetMessageCenterTray() {
  return message_center_tray_.get();
}

bool WebNotificationTray::IsCommandIdChecked(int command_id) const {
  if (command_id != kToggleQuietMode)
    return false;
  return message_center()->IsQuietMode();
}

bool WebNotificationTray::IsCommandIdEnabled(int command_id) const {
  return true;
}

bool WebNotificationTray::GetAcceleratorForCommandId(
    int command_id,
    ui::Accelerator* accelerator) {
  return false;
}

void WebNotificationTray::ExecuteCommand(int command_id, int event_flags) {
  if (command_id == kToggleQuietMode) {
    bool in_quiet_mode = message_center()->IsQuietMode();
    message_center()->SetQuietMode(!in_quiet_mode);
    return;
  }
  base::TimeDelta expires_in = command_id == kEnableQuietModeDay ?
      base::TimeDelta::FromDays(1):
      base::TimeDelta::FromHours(1);
  message_center()->EnterQuietModeWithExpire(expires_in);
}

void WebNotificationTray::ButtonPressed(views::Button* sender,
                                        const ui::Event& event) {
  DCHECK_EQ(button_, sender);
  PerformAction(event);
}

void WebNotificationTray::OnMessageCenterTrayChanged() {
  // Do not update the tray contents directly. Multiple change events can happen
  // consecutively, and calling Update in the middle of those events will show
  // intermediate unread counts for a moment.
  should_update_tray_content_ = true;
  base::MessageLoop::current()->PostTask(
      FROM_HERE,
      base::Bind(&WebNotificationTray::UpdateTrayContent, AsWeakPtr()));
}

void WebNotificationTray::UpdateTrayContent() {
  if (!should_update_tray_content_)
    return;
  should_update_tray_content_ = false;

  message_center::MessageCenter* message_center =
      message_center_tray_->message_center();
  button_->SetUnreadCount(message_center->UnreadNotificationCount());
  if (IsMessageCenterBubbleVisible())
    button_->SetState(views::CustomButton::STATE_PRESSED);
  else
    button_->SetState(views::CustomButton::STATE_NORMAL);
  SetVisible((status_area_widget()->login_status() != user::LOGGED_IN_NONE) &&
             (status_area_widget()->login_status() != user::LOGGED_IN_LOCKED) &&
             (message_center->NotificationCount() > 0));
  Layout();
  SchedulePaint();
}

bool WebNotificationTray::ClickedOutsideBubble() {
  // Only hide the message center
  if (!message_center_bubble())
    return false;

  message_center_tray_->HideMessageCenterBubble();
  return true;
}

message_center::MessageCenter* WebNotificationTray::message_center() const {
  return message_center_tray_->message_center();
}

// Methods for testing

bool WebNotificationTray::IsPopupVisible() const {
  return message_center_tray_->popups_visible();
}

message_center::MessageCenterBubble*
WebNotificationTray::GetMessageCenterBubbleForTest() {
  if (!message_center_bubble())
    return NULL;
  return static_cast<message_center::MessageCenterBubble*>(
      message_center_bubble()->bubble());
}

}  // namespace ash