// 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/display/resolution_notification_controller.h"

#include "ash/display/display_controller.h"
#include "ash/display/display_info.h"
#include "ash/display/display_manager.h"
#include "ash/shell.h"
#include "ash/system/system_notifier.h"
#include "base/strings/utf_string_conversions.h"
#include "grit/ash_resources.h"
#include "grit/ash_strings.h"
#include "ui/base/l10n/l10n_util.h"
#include "ui/base/l10n/time_format.h"
#include "ui/base/resource/resource_bundle.h"
#include "ui/gfx/display.h"
#include "ui/gfx/screen.h"
#include "ui/message_center/message_center.h"
#include "ui/message_center/notification.h"
#include "ui/message_center/notification_delegate.h"

using message_center::Notification;

namespace ash {
namespace {

bool g_use_timer = true;

class ResolutionChangeNotificationDelegate
    : public message_center::NotificationDelegate {
 public:
  ResolutionChangeNotificationDelegate(
      ResolutionNotificationController* controller,
      bool has_timeout);

 protected:
  virtual ~ResolutionChangeNotificationDelegate();

 private:
  // message_center::NotificationDelegate overrides:
  virtual void Display() OVERRIDE;
  virtual void Error() OVERRIDE;
  virtual void Close(bool by_user) OVERRIDE;
  virtual void Click() OVERRIDE;
  virtual bool HasClickedListener() OVERRIDE;
  virtual void ButtonClick(int button_index) OVERRIDE;

  ResolutionNotificationController* controller_;
  bool has_timeout_;

  DISALLOW_COPY_AND_ASSIGN(ResolutionChangeNotificationDelegate);
};

ResolutionChangeNotificationDelegate::ResolutionChangeNotificationDelegate(
    ResolutionNotificationController* controller,
    bool has_timeout)
    : controller_(controller),
      has_timeout_(has_timeout) {
  DCHECK(controller_);
}

ResolutionChangeNotificationDelegate::~ResolutionChangeNotificationDelegate() {
}

void ResolutionChangeNotificationDelegate::Display() {
}

void ResolutionChangeNotificationDelegate::Error() {
}

void ResolutionChangeNotificationDelegate::Close(bool by_user) {
  if (by_user)
    controller_->AcceptResolutionChange(false);
}

void ResolutionChangeNotificationDelegate::Click() {
  controller_->AcceptResolutionChange(true);
}

bool ResolutionChangeNotificationDelegate::HasClickedListener() {
  return true;
}

void ResolutionChangeNotificationDelegate::ButtonClick(int button_index) {
  // If there's the timeout, the first button is "Accept". Otherwise the
  // button click should be "Revert".
  if (has_timeout_ && button_index == 0)
    controller_->AcceptResolutionChange(true);
  else
    controller_->RevertResolutionChange();
}

}  // namespace

// static
const int ResolutionNotificationController::kTimeoutInSec = 15;

// static
const char ResolutionNotificationController::kNotificationId[] =
    "chrome://settings/display/resolution";

struct ResolutionNotificationController::ResolutionChangeInfo {
  ResolutionChangeInfo(int64 display_id,
                       const DisplayMode& old_resolution,
                       const DisplayMode& new_resolution,
                       const base::Closure& accept_callback);
  ~ResolutionChangeInfo();

  // The id of the display where the resolution change happens.
  int64 display_id;

  // The resolution before the change.
  DisplayMode old_resolution;

  // The requested resolution. Note that this may be different from
  // |current_resolution| which is the actual resolution set.
  DisplayMode new_resolution;

  // The actual resolution after the change.
  DisplayMode current_resolution;

  // The callback when accept is chosen.
  base::Closure accept_callback;

  // The remaining timeout in seconds. 0 if the change does not time out.
  uint8 timeout_count;

  // The timer to invoke OnTimerTick() every second. This cannot be
  // OneShotTimer since the message contains text "automatically closed in xx
  // seconds..." which has to be updated every second.
  base::RepeatingTimer<ResolutionNotificationController> timer;

 private:
  DISALLOW_COPY_AND_ASSIGN(ResolutionChangeInfo);
};

ResolutionNotificationController::ResolutionChangeInfo::ResolutionChangeInfo(
    int64 display_id,
    const DisplayMode& old_resolution,
    const DisplayMode& new_resolution,
    const base::Closure& accept_callback)
    : display_id(display_id),
      old_resolution(old_resolution),
      new_resolution(new_resolution),
      accept_callback(accept_callback),
      timeout_count(0) {
  DisplayManager* display_manager = Shell::GetInstance()->display_manager();
  if (!display_manager->HasInternalDisplay() &&
      display_manager->num_connected_displays() == 1u) {
    timeout_count = kTimeoutInSec;
  }
}

ResolutionNotificationController::ResolutionChangeInfo::
    ~ResolutionChangeInfo() {
}

ResolutionNotificationController::ResolutionNotificationController() {
  Shell::GetInstance()->display_controller()->AddObserver(this);
  Shell::GetScreen()->AddObserver(this);
}

ResolutionNotificationController::~ResolutionNotificationController() {
  Shell::GetInstance()->display_controller()->RemoveObserver(this);
  Shell::GetScreen()->RemoveObserver(this);
}

void ResolutionNotificationController::PrepareNotification(
    int64 display_id,
    const DisplayMode& old_resolution,
    const DisplayMode& new_resolution,
    const base::Closure& accept_callback) {
  // If multiple resolution changes are invoked for the same display,
  // the original resolution for the first resolution change has to be used
  // instead of the specified |old_resolution|.
  DisplayMode original_resolution;
  if (change_info_ && change_info_->display_id == display_id) {
    DCHECK(change_info_->new_resolution.size == old_resolution.size);
    original_resolution = change_info_->old_resolution;
  }

  change_info_.reset(new ResolutionChangeInfo(
      display_id, old_resolution, new_resolution, accept_callback));
  if (!original_resolution.size.IsEmpty())
    change_info_->old_resolution = original_resolution;
}

bool ResolutionNotificationController::DoesNotificationTimeout() {
  return change_info_ && change_info_->timeout_count > 0;
}

void ResolutionNotificationController::CreateOrUpdateNotification(
    bool enable_spoken_feedback) {
  message_center::MessageCenter* message_center =
      message_center::MessageCenter::Get();
  if (!change_info_) {
    message_center->RemoveNotification(kNotificationId, false /* by_user */);
    return;
  }

  base::string16 timeout_message;
  message_center::RichNotificationData data;
  if (change_info_->timeout_count > 0) {
    data.buttons.push_back(message_center::ButtonInfo(
        l10n_util::GetStringUTF16(IDS_ASH_DISPLAY_RESOLUTION_CHANGE_ACCEPT)));
    timeout_message = l10n_util::GetStringFUTF16(
        IDS_ASH_DISPLAY_RESOLUTION_TIMEOUT,
        ui::TimeFormat::Simple(
            ui::TimeFormat::FORMAT_DURATION, ui::TimeFormat::LENGTH_LONG,
            base::TimeDelta::FromSeconds(change_info_->timeout_count)));
  }
  data.buttons.push_back(message_center::ButtonInfo(
        l10n_util::GetStringUTF16(IDS_ASH_DISPLAY_RESOLUTION_CHANGE_REVERT)));

  data.should_make_spoken_feedback_for_popup_updates = enable_spoken_feedback;

  const base::string16 display_name = base::UTF8ToUTF16(
      Shell::GetInstance()->display_manager()->GetDisplayNameForId(
          change_info_->display_id));
  const base::string16 message =
      (change_info_->new_resolution.size ==
       change_info_->current_resolution.size) ?
      l10n_util::GetStringFUTF16(
          IDS_ASH_STATUS_TRAY_DISPLAY_RESOLUTION_CHANGED,
          display_name,
          base::UTF8ToUTF16(change_info_->new_resolution.size.ToString())) :
      l10n_util::GetStringFUTF16(
          IDS_ASH_STATUS_TRAY_DISPLAY_RESOLUTION_CHANGED_TO_UNSUPPORTED,
          display_name,
          base::UTF8ToUTF16(change_info_->new_resolution.size.ToString()),
          base::UTF8ToUTF16(change_info_->current_resolution.size.ToString()));

  ui::ResourceBundle& bundle = ui::ResourceBundle::GetSharedInstance();
  scoped_ptr<Notification> notification(new Notification(
      message_center::NOTIFICATION_TYPE_SIMPLE,
      kNotificationId,
      message,
      timeout_message,
      bundle.GetImageNamed(IDR_AURA_NOTIFICATION_DISPLAY),
      base::string16() /* display_source */,
      message_center::NotifierId(
          message_center::NotifierId::SYSTEM_COMPONENT,
          system_notifier::kNotifierDisplayResolutionChange),
      data,
      new ResolutionChangeNotificationDelegate(
          this, change_info_->timeout_count > 0)));
  notification->SetSystemPriority();
  message_center->AddNotification(notification.Pass());
}

void ResolutionNotificationController::OnTimerTick() {
  if (!change_info_)
    return;

  --change_info_->timeout_count;
  if (change_info_->timeout_count == 0)
    RevertResolutionChange();
  else
    CreateOrUpdateNotification(false);
}

void ResolutionNotificationController::AcceptResolutionChange(
    bool close_notification) {
  if (close_notification) {
    message_center::MessageCenter::Get()->RemoveNotification(
        kNotificationId, false /* by_user */);
  }
  base::Closure callback = change_info_->accept_callback;
  change_info_.reset();
  callback.Run();
}

void ResolutionNotificationController::RevertResolutionChange() {
  message_center::MessageCenter::Get()->RemoveNotification(
      kNotificationId, false /* by_user */);
  int64 display_id = change_info_->display_id;
  DisplayMode old_resolution = change_info_->old_resolution;
  change_info_.reset();
  Shell::GetInstance()->display_manager()->SetDisplayMode(
      display_id, old_resolution);
}

void ResolutionNotificationController::OnDisplayAdded(
    const gfx::Display& new_display) {
}

void ResolutionNotificationController::OnDisplayRemoved(
    const gfx::Display& old_display) {
  if (change_info_ && change_info_->display_id == old_display.id())
    RevertResolutionChange();
}

void ResolutionNotificationController::OnDisplayMetricsChanged(
    const gfx::Display&, uint32_t) {
}

void ResolutionNotificationController::OnDisplayConfigurationChanged() {
  if (!change_info_)
    return;

  change_info_->current_resolution = Shell::GetInstance()->display_manager()->
      GetActiveModeForDisplayId(change_info_->display_id);
  CreateOrUpdateNotification(true);
  if (g_use_timer && change_info_->timeout_count > 0) {
    change_info_->timer.Start(FROM_HERE,
                              base::TimeDelta::FromSeconds(1),
                              this,
                              &ResolutionNotificationController::OnTimerTick);
  }
}

void ResolutionNotificationController::SuppressTimerForTest() {
  g_use_timer = false;
}

}  // namespace ash