// 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 "chrome/browser/chromeos/login/user_adding_screen.h"

#include "base/bind.h"
#include "base/memory/singleton.h"
#include "base/observer_list.h"
#include "chrome/browser/chromeos/login/helper.h"
#include "chrome/browser/chromeos/login/login_display_host_impl.h"
#include "ui/gfx/rect.h"
#include "ui/gfx/size.h"

namespace chromeos {

namespace {

class UserAddingScreenImpl : public UserAddingScreen {
 public:
  virtual void Start() OVERRIDE;
  virtual void Cancel() OVERRIDE;
  virtual bool IsRunning() OVERRIDE;

  virtual void AddObserver(Observer* observer) OVERRIDE;
  virtual void RemoveObserver(Observer* observer) OVERRIDE;

  static UserAddingScreenImpl* GetInstance();
 private:
  friend struct DefaultSingletonTraits<UserAddingScreenImpl>;

  void OnDisplayHostCompletion();

  UserAddingScreenImpl();
  virtual ~UserAddingScreenImpl();

  ObserverList<Observer> observers_;
  LoginDisplayHost* display_host_;
};

void UserAddingScreenImpl::Start() {
  CHECK(!IsRunning());
  gfx::Rect screen_bounds(chromeos::CalculateScreenBounds(gfx::Size()));
  display_host_ = new chromeos::LoginDisplayHostImpl(screen_bounds);
  display_host_->StartUserAdding(
      base::Bind(&UserAddingScreenImpl::OnDisplayHostCompletion,
                 base::Unretained(this)));
  FOR_EACH_OBSERVER(Observer, observers_, OnUserAddingStarted());
}

void UserAddingScreenImpl::Cancel() {
  CHECK(IsRunning());
  display_host_->Finalize();
}

bool UserAddingScreenImpl::IsRunning() {
  return display_host_ != NULL;
}

void UserAddingScreenImpl::AddObserver(Observer* observer) {
  observers_.AddObserver(observer);
}

void UserAddingScreenImpl::RemoveObserver(Observer* observer) {
  observers_.RemoveObserver(observer);
}

void UserAddingScreenImpl::OnDisplayHostCompletion() {
  CHECK(IsRunning());
  display_host_ = NULL;
  FOR_EACH_OBSERVER(Observer, observers_, OnUserAddingFinished());
}

// static
UserAddingScreenImpl* UserAddingScreenImpl::GetInstance() {
  return Singleton<UserAddingScreenImpl>::get();
}

UserAddingScreenImpl::UserAddingScreenImpl()
  : display_host_(NULL) {
}

UserAddingScreenImpl::~UserAddingScreenImpl() {
}

}  // anonymous namespace

UserAddingScreen::UserAddingScreen() {}
UserAddingScreen::~UserAddingScreen() {}

UserAddingScreen* UserAddingScreen::Get() {
  return UserAddingScreenImpl::GetInstance();
}

}  // namespace chromeos