// 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 "chrome/browser/ui/views/profiles/user_manager_view.h"

#include "base/callback.h"
#include "base/time/time.h"
#include "build/build_config.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/lifetime/keep_alive_types.h"
#include "chrome/browser/lifetime/scoped_keep_alive.h"
#include "chrome/browser/profiles/profile_avatar_icon_util.h"
#include "chrome/browser/profiles/profile_manager.h"
#include "chrome/browser/profiles/profile_metrics.h"
#include "chrome/browser/profiles/profile_window.h"
#include "chrome/browser/profiles/profiles_state.h"
#include "chrome/browser/signin/signin_promo.h"
#include "chrome/browser/ui/browser.h"
#include "chrome/browser/ui/browser_dialogs.h"
#include "chrome/browser/ui/browser_finder.h"
#include "chrome/browser/ui/browser_window.h"
#include "chrome/browser/ui/user_manager.h"
#include "chrome/grit/chromium_strings.h"
#include "chrome/grit/generated_resources.h"
#include "components/guest_view/browser/guest_view_manager.h"
#include "content/public/browser/navigation_details.h"
#include "content/public/browser/render_widget_host_view.h"
#include "content/public/browser/web_contents.h"
#include "google_apis/gaia/gaia_urls.h"
#include "ui/base/l10n/l10n_util.h"
#include "ui/gfx/screen.h"
#include "ui/views/controls/webview/webview.h"
#include "ui/views/layout/fill_layout.h"
#include "ui/views/view.h"
#include "ui/views/widget/widget.h"
#include "ui/views/window/dialog_client_view.h"

#if defined(OS_WIN)
#include "chrome/browser/shell_integration.h"
#include "ui/base/win/shell.h"
#include "ui/views/win/hwnd_util.h"
#endif

#if defined(USE_ASH)
#include "ash/shelf/shelf_util.h"
#include "ash/wm/window_util.h"
#include "grit/ash_resources.h"
#endif

namespace {

// An open User Manager window. There can only be one open at a time. This
// is reset to NULL when the window is closed.
UserManagerView* instance_ = nullptr;
base::Closure* user_manager_shown_callback_for_testing_ = nullptr;
bool instance_under_construction_ = false;

class ReauthDelegate : public views::DialogDelegateView,
                       public UserManager::ReauthDialogObserver {
 public:
  ReauthDelegate(views::WebView* web_view,
                 const std::string& email_address);
  ~ReauthDelegate() override {}

 private:
  ReauthDelegate();
  // views::DialogDelegate:
  gfx::Size GetPreferredSize() const override;
  bool CanResize() const override;
  bool CanMaximize() const override;
  bool CanMinimize() const override;
  bool UseNewStyleForThisDialog() const override;
  ui::ModalType GetModalType() const override;
  void DeleteDelegate() override;
  base::string16 GetWindowTitle() const override;
  int GetDialogButtons() const override;
  views::View* GetInitiallyFocusedView() override;

  // UserManager::ReauthObserver:
  void CloseReauthDialog() override;

  views::WebView* web_view_;
  const std::string email_address_;

  DISALLOW_COPY_AND_ASSIGN(ReauthDelegate);
};

ReauthDelegate::ReauthDelegate(views::WebView* web_view,
                               const std::string& email_address)
    : UserManager::ReauthDialogObserver(
          web_view->GetWebContents(), email_address),
      web_view_(web_view),
      email_address_(email_address) {
  AddChildView(web_view_);
  SetLayoutManager(new views::FillLayout());

  // Load the re-auth URL, prepopulated with the user's email address.
  // Add the index of the profile to the URL so that the inline login page
  // knows which profile to load and update the credentials.
  GURL url = signin::GetReauthURLWithEmail(
      signin_metrics::AccessPoint::ACCESS_POINT_USER_MANAGER,
      signin_metrics::Reason::REASON_UNLOCK, email_address_);
  web_view_->LoadInitialURL(url);
}

gfx::Size ReauthDelegate::GetPreferredSize() const {
  return gfx::Size(UserManager::kReauthDialogWidth,
                   UserManager::kReauthDialogHeight);
}

bool ReauthDelegate::CanResize() const {
  return true;
}

bool ReauthDelegate::CanMaximize() const  {
  return true;
}

bool ReauthDelegate::CanMinimize() const  {
  return true;
}

bool ReauthDelegate::UseNewStyleForThisDialog() const {
  return false;
}

ui::ModalType ReauthDelegate::GetModalType() const {
  return ui::MODAL_TYPE_WINDOW;
}

void ReauthDelegate::DeleteDelegate() {
  delete this;
}

base::string16 ReauthDelegate::GetWindowTitle() const {
  return l10n_util::GetStringUTF16(IDS_PROFILES_GAIA_SIGNIN_TITLE);
}

int ReauthDelegate::GetDialogButtons() const {
  return ui::DIALOG_BUTTON_NONE;
}

views::View* ReauthDelegate::GetInitiallyFocusedView() {
  return static_cast<views::View*>(web_view_);
}

void ReauthDelegate::CloseReauthDialog() {
  GetWidget()->Close();
}

}  // namespace

// UserManager -----------------------------------------------------------------

// static
void UserManager::Show(
    const base::FilePath& profile_path_to_focus,
    profiles::UserManagerTutorialMode tutorial_mode,
    profiles::UserManagerProfileSelected profile_open_action) {
  DCHECK(profile_path_to_focus != ProfileManager::GetGuestProfilePath());

  ProfileMetrics::LogProfileOpenMethod(ProfileMetrics::OPEN_USER_MANAGER);
  if (instance_) {
    // If we are showing the User Manager after locking a profile, change the
    // active profile to Guest.
    profiles::SetActiveProfileToGuestIfLocked();

    // Note the time we started opening the User Manager.
    instance_->set_user_manager_started_showing(base::Time::Now());

    // If there's a user manager window open already, just activate it.
    instance_->GetWidget()->Activate();
    return;
  }

  // Under some startup conditions, we can try twice to create the User Manager.
  // Because creating the System profile is asynchronous, it's possible for
  // there to then be multiple pending operations and eventually multiple
  // User Managers.
  if (instance_under_construction_)
    return;

  // Create the system profile, if necessary, and open the user manager
  // from the system profile.
  UserManagerView* user_manager = new UserManagerView();
  user_manager->set_user_manager_started_showing(base::Time::Now());
  profiles::CreateSystemProfileForUserManager(
      profile_path_to_focus,
      tutorial_mode,
      profile_open_action,
      base::Bind(&UserManagerView::OnSystemProfileCreated,
                 base::Passed(make_scoped_ptr(user_manager)),
                 base::Owned(new base::AutoReset<bool>(
                     &instance_under_construction_, true))));
}

// static
void UserManager::Hide() {
  if (instance_)
    instance_->GetWidget()->Close();
}

// static
bool UserManager::IsShowing() {
  return instance_ ? instance_->GetWidget()->IsActive() : false;
}

// static
void UserManager::OnUserManagerShown() {
  if (instance_) {
    instance_->LogTimeToOpen();
    if (user_manager_shown_callback_for_testing_) {
      if (!user_manager_shown_callback_for_testing_->is_null())
        user_manager_shown_callback_for_testing_->Run();

      delete user_manager_shown_callback_for_testing_;
      user_manager_shown_callback_for_testing_ = nullptr;
    }
  }
}

// static
void UserManager::ShowReauthDialog(content::BrowserContext* browser_context,
                                   const std::string& email) {
  // This method should only be called if the user manager is already showing.
  if (!IsShowing())
    return;

  // The dialog delegate will be deleted when the dialog closes and the created
  // WebView's lifetime is managed by the delegate.
  views::DialogDelegate* delegate =
      new ReauthDelegate(new views::WebView(browser_context), email);
  gfx::NativeView parent = instance_->GetWidget()->GetNativeView();
  views::DialogDelegate::CreateDialogWidget(delegate, nullptr, parent);
  delegate->GetWidget()->Show();
}

// static
void UserManager::AddOnUserManagerShownCallbackForTesting(
    const base::Closure& callback) {
  DCHECK(!user_manager_shown_callback_for_testing_);
  user_manager_shown_callback_for_testing_ = new base::Closure(callback);
}

// UserManagerView -------------------------------------------------------------

UserManagerView::UserManagerView()
    : web_view_(NULL),
      user_manager_started_showing_(base::Time()) {
#if !defined(USE_ASH)
  keep_alive_.reset(new ScopedKeepAlive(KeepAliveOrigin::USER_MANAGER_VIEW,
                                        KeepAliveRestartOption::DISABLED));
#endif  // !defined(USE_ASH)
}

UserManagerView::~UserManagerView() {
}

// static
void UserManagerView::OnSystemProfileCreated(
    scoped_ptr<UserManagerView> instance,
    base::AutoReset<bool>* pending,
    Profile* system_profile,
    const std::string& url) {
  // If we are showing the User Manager after locking a profile, change the
  // active profile to Guest.
  profiles::SetActiveProfileToGuestIfLocked();

  DCHECK(!instance_);
  instance_ = instance.release();  // |instance_| takes over ownership.
  instance_->Init(system_profile, GURL(url));
}

void UserManagerView::Init(Profile* system_profile, const GURL& url) {
  web_view_ = new views::WebView(system_profile);
  web_view_->set_allow_accelerators(true);
  AddChildView(web_view_);
  SetLayoutManager(new views::FillLayout);
  AddAccelerator(ui::Accelerator(ui::VKEY_W, ui::EF_CONTROL_DOWN));
  AddAccelerator(ui::Accelerator(ui::VKEY_F4, ui::EF_ALT_DOWN));

  // If the user manager is being displayed from an existing profile, use
  // its last active browser to determine where the user manager should be
  // placed.  This is used so that we can center the dialog on the correct
  // monitor in a multiple-monitor setup.
  //
  // If the last active profile is empty (for example, starting up chrome
  // when all existing profiles are locked), not loaded (for example, if guest
  // was set after locking the only open profile) or we can't find an active
  // browser, bounds will remain empty and the user manager will be centered on
  // the default monitor by default.
  //
  // Note the profile is accessed via GetProfileByPath(GetLastUsedProfileDir())
  // instead of GetLastUsedProfile().  If the last active profile isn't loaded,
  // the latter may try to synchronously load it, which can only be done on a
  // thread where disk IO is allowed.
  gfx::Rect bounds;
  ProfileManager* profile_manager = g_browser_process->profile_manager();
  const base::FilePath& last_used_profile_path =
      profile_manager->GetLastUsedProfileDir(profile_manager->user_data_dir());
  Profile* profile = profile_manager->GetProfileByPath(last_used_profile_path);
  if (profile) {
    Browser* browser = chrome::FindLastActiveWithProfile(profile);
    if (browser) {
      gfx::NativeView native_view =
          views::Widget::GetWidgetForNativeWindow(
              browser->window()->GetNativeWindow())->GetNativeView();
      bounds = gfx::Screen::GetScreen()
                   ->GetDisplayNearestWindow(native_view)
                   .work_area();
      bounds.ClampToCenteredSize(gfx::Size(UserManager::kWindowWidth,
                                           UserManager::kWindowHeight));
    }
  }

  DialogDelegate::CreateDialogWidgetWithBounds(this, NULL, NULL, bounds);

  // Since the User Manager can be the only top level window, we don't
  // want to accidentally quit all of Chrome if the user is just trying to
  // unfocus the selected pod in the WebView.
  GetDialogClientView()->RemoveAccelerator(
      ui::Accelerator(ui::VKEY_ESCAPE, ui::EF_NONE));

#if defined(OS_WIN)
  // Set the app id for the task manager to the app id of its parent
  ui::win::SetAppIdForWindow(shell_integration::GetChromiumModelIdForProfile(
                                 system_profile->GetPath()),
                             views::HWNDForWidget(GetWidget()));
#endif

#if defined(USE_ASH)
  gfx::NativeWindow native_window = GetWidget()->GetNativeWindow();
  ash::SetShelfItemDetailsForDialogWindow(
      native_window, IDR_ASH_SHELF_LIST_BROWSER, native_window->title());
#endif

  web_view_->LoadInitialURL(url);
  content::RenderWidgetHostView* rwhv =
      web_view_->GetWebContents()->GetRenderWidgetHostView();
  if (rwhv)
    rwhv->SetBackgroundColor(profiles::kUserManagerBackgroundColor);

  GetWidget()->Show();
  web_view_->RequestFocus();
}

void UserManagerView::LogTimeToOpen() {
  if (user_manager_started_showing_ == base::Time())
    return;

  ProfileMetrics::LogTimeToOpenUserManager(
      base::Time::Now() - user_manager_started_showing_);
  user_manager_started_showing_ = base::Time();
}

bool UserManagerView::AcceleratorPressed(const ui::Accelerator& accelerator) {
  int key = accelerator.key_code();
  int modifier = accelerator.modifiers();
  DCHECK((key == ui::VKEY_W && modifier == ui::EF_CONTROL_DOWN) ||
         (key == ui::VKEY_F4 && modifier == ui::EF_ALT_DOWN));
  GetWidget()->Close();
  return true;
}

gfx::Size UserManagerView::GetPreferredSize() const {
  return gfx::Size(UserManager::kWindowWidth, UserManager::kWindowHeight);
}

bool UserManagerView::CanResize() const {
  return true;
}

bool UserManagerView::CanMaximize() const {
  return true;
}

bool UserManagerView::CanMinimize() const {
  return true;
}

base::string16 UserManagerView::GetWindowTitle() const {
  return l10n_util::GetStringUTF16(IDS_PRODUCT_NAME);
}

int UserManagerView::GetDialogButtons() const {
  return ui::DIALOG_BUTTON_NONE;
}

void UserManagerView::WindowClosing() {
  // Now that the window is closed, we can allow a new one to be opened.
  // (WindowClosing comes in asynchronously from the call to Close() and we
  // may have already opened a new instance).
  if (instance_ == this)
    instance_ = NULL;
}

bool UserManagerView::UseNewStyleForThisDialog() const {
  return false;
}