// Copyright (c) 2010 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/existing_user_view.h"

#include "app/l10n_util.h"
#include "chrome/browser/chromeos/login/helper.h"
#include "chrome/browser/chromeos/login/user_controller.h"
#include "grit/generated_resources.h"
#include "views/grid_layout.h"

namespace chromeos {

using login::kBorderSize;
using views::GridLayout;

// NativeButton that will always return focus to password field.
class UserEntryNativeButton : public views::NativeButton {
 public:
  UserEntryNativeButton(UserController* controller,
                        views::ButtonListener* listener,
                        const std::wstring& label)
      : NativeButton(listener, label),
        controller_(controller) {}

  // Overridden from View:
  virtual void DidGainFocus() {
    controller_->FocusPasswordField();
  }

 private:
  UserController* controller_;

  DISALLOW_COPY_AND_ASSIGN(UserEntryNativeButton);
};

// Textfield with custom processing for Tab/Shift+Tab to select entries.
class UserEntryTextfield : public views::Textfield {
 public:
  UserEntryTextfield(UserController* controller,
                     views::Textfield::StyleFlags style)
      : Textfield(style),
        controller_(controller) {}

  // Overridden from View:
  virtual bool OnKeyPressed(const views::KeyEvent& e) {
    if (e.GetKeyCode() == base::VKEY_TAB) {
      int index = controller_->user_index() + (e.IsShiftDown() ? -1 : 1);
      controller_->SelectUser(index);
      return true;
    } else {
      return false;
    }
  }

  // Overridden from views::Textfield:
  virtual bool SkipDefaultKeyEventProcessing(const views::KeyEvent& e) {
    if (e.GetKeyCode() == base::VKEY_TAB)
      return true;
    else
      return views::Textfield::SkipDefaultKeyEventProcessing(e);
  }

 private:
  UserController* controller_;

  DISALLOW_COPY_AND_ASSIGN(UserEntryTextfield);
};

void ExistingUserView::RecreateFields() {
  delete password_field_;
  password_field_ = new UserEntryTextfield(user_controller_,
                                           views::Textfield::STYLE_PASSWORD);
  password_field_->set_text_to_display_when_empty(
      l10n_util::GetStringUTF16(IDS_LOGIN_EMPTY_PASSWORD_TEXT));
  password_field_->SetController(user_controller_);
  delete submit_button_;
  submit_button_ = new UserEntryNativeButton(
      user_controller_, user_controller_,
      l10n_util::GetString(IDS_LOGIN_BUTTON));
  submit_button_->SetFocusable(false);
  GridLayout* layout = new GridLayout(this);
  views::ColumnSet* column_set = layout->AddColumnSet(0);
  column_set->AddColumn(GridLayout::FILL, GridLayout::FILL, 1,
                        GridLayout::USE_PREF, 0, 0);
  column_set->AddPaddingColumn(0, kBorderSize);
  column_set->AddColumn(GridLayout::FILL, GridLayout::FILL, 0,
                        GridLayout::USE_PREF, 0, 0);
  layout->StartRow(0, 0);
  layout->AddView(password_field_);
  layout->AddView(submit_button_);
  SetLayoutManager(layout);
  layout->Layout(this);
  SchedulePaint();
}

}  // namespace chromeos