// Copyright 2014 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 "athena/system/power_button_controller.h"

#include "athena/screen/public/screen_manager.h"
#include "athena/strings/grit/athena_strings.h"
#include "chromeos/dbus/dbus_thread_manager.h"
#include "ui/base/l10n/l10n_util.h"
#include "ui/gfx/font_list.h"
#include "ui/views/background.h"
#include "ui/views/border.h"
#include "ui/views/controls/label.h"
#include "ui/views/layout/box_layout.h"
#include "ui/views/widget/widget.h"

namespace athena {
namespace {

// The amount of time that the power button must be held to show the shutdown
// warning dialog.
const int kShowShutdownWarningTimeoutMs = 1000;

// The amount of time that the power button must be held to shut down the
// device.
const int kShutdownTimeoutMs = 5000;

}  // namespace

PowerButtonController::PowerButtonController(aura::Window* dialog_container)
    : warning_message_container_(dialog_container),
      brightness_is_zero_(false),
      state_(STATE_OTHER) {
  chromeos::DBusThreadManager::Get()->GetPowerManagerClient()->AddObserver(
      this);
}

PowerButtonController::~PowerButtonController() {
  chromeos::DBusThreadManager::Get()->GetPowerManagerClient()->RemoveObserver(
      this);
}

void PowerButtonController::ShowShutdownWarningDialog() {
  state_ = STATE_SHUTDOWN_WARNING_VISIBLE;

  shutdown_warning_message_.reset(new views::Widget);

  views::Widget::InitParams params(views::Widget::InitParams::TYPE_POPUP);
  params.ownership = views::Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
  params.parent = warning_message_container_;
  shutdown_warning_message_->Init(params);

  views::Label* label =
      new views::Label(l10n_util::GetStringUTF16(IDS_ATHENA_SHUTDOWN_WARNING));
  label->SetBackgroundColor(SK_ColorWHITE);
  label->SetFontList(gfx::FontList().DeriveWithStyle(gfx::Font::BOLD));

  views::View* container = new views::View;
  container->AddChildView(label);

  const int kBorderSpacing = 50;
  container->SetLayoutManager(new views::BoxLayout(
      views::BoxLayout::kHorizontal, kBorderSpacing, kBorderSpacing, 0));
  container->set_background(
      views::Background::CreateSolidBackground(SK_ColorWHITE));
  container->SetBorder(views::Border::CreateSolidBorder(1, SK_ColorBLACK));

  shutdown_warning_message_->SetContentsView(container);
  shutdown_warning_message_->CenterWindow(container->GetPreferredSize());
  shutdown_warning_message_->Show();

  timer_.Start(FROM_HERE,
               base::TimeDelta::FromMilliseconds(kShutdownTimeoutMs -
                                                 kShowShutdownWarningTimeoutMs),
               this,
               &PowerButtonController::Shutdown);
}

void PowerButtonController::Shutdown() {
  state_ = STATE_SHUTDOWN_REQUESTED;
  chromeos::DBusThreadManager::Get()
      ->GetPowerManagerClient()
      ->RequestShutdown();
}

void PowerButtonController::BrightnessChanged(int level, bool user_initiated) {
  if (brightness_is_zero_)
    zero_brightness_end_time_ = base::TimeTicks::Now();
  brightness_is_zero_ = (level == 0);
}

void PowerButtonController::PowerButtonEventReceived(
    bool down,
    const base::TimeTicks& timestamp) {
  if (state_ == STATE_SHUTDOWN_REQUESTED)
    return;

  // Avoid requesting suspend or shutdown if the power button is pressed while
  // the screen is off (http://crbug.com/128451).
  base::TimeDelta time_since_zero_brightness = brightness_is_zero_ ?
      base::TimeDelta() : (base::TimeTicks::Now() - zero_brightness_end_time_);
  const int kShortTimeMs = 10;
  if (time_since_zero_brightness.InMilliseconds() <= kShortTimeMs)
    return;

  if (down) {
    state_ = STATE_SUSPEND_ON_RELEASE;
    timer_.Start(
        FROM_HERE,
        base::TimeDelta::FromMilliseconds(kShowShutdownWarningTimeoutMs),
        this,
        &PowerButtonController::ShowShutdownWarningDialog);
  } else {
    if (state_ == STATE_SUSPEND_ON_RELEASE) {
      chromeos::DBusThreadManager::Get()
          ->GetPowerManagerClient()
          ->RequestSuspend();
    }
    state_ = STATE_OTHER;
    timer_.Stop();
    shutdown_warning_message_.reset();
  }
}

}  // namespace athena