// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "chrome/browser/ui/passwords/password_generation_popup_controller_impl.h"

#include <math.h>
#include <stddef.h>

#include <algorithm>
#include <utility>
#include <vector>

#include "base/feature_list.h"
#include "base/functional/bind.h"
#include "base/i18n/rtl.h"
#include "base/memory/raw_ptr.h"
#include "base/strings/string_split.h"
#include "base/strings/string_util.h"
#include "base/strings/utf_string_conversion_utils.h"
#include "base/strings/utf_string_conversions.h"
#include "build/build_config.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/signin/identity_manager_factory.h"
#include "chrome/browser/ui/passwords/password_generation_popup_controller.h"
#include "chrome/browser/ui/passwords/password_generation_popup_observer.h"
#include "chrome/browser/ui/passwords/password_generation_popup_view.h"
#include "chrome/common/url_constants.h"
#include "chrome/grit/branded_strings.h"
#include "chrome/grit/generated_resources.h"
#include "components/autofill/core/browser/suggestions/suggestion.h"
#include "components/autofill/core/browser/ui/popup_open_enums.h"
#include "components/autofill/core/common/password_generation_util.h"
#include "components/input/native_web_keyboard_event.h"
#include "components/password_manager/core/browser/password_bubble_experiment.h"
#include "components/password_manager/core/browser/password_generation_frame_helper.h"
#include "components/password_manager/core/browser/password_manager.h"
#include "components/password_manager/core/browser/password_manager_driver.h"
#include "components/signin/public/base/consent_level.h"
#include "components/signin/public/identity_manager/identity_manager.h"
#include "components/strings/grit/components_strings.h"
#include "content/public/browser/navigation_handle.h"
#include "content/public/browser/render_widget_host.h"
#include "content/public/browser/render_widget_host_view.h"
#include "content/public/browser/web_contents.h"
#include "ui/accessibility/platform/ax_platform.h"
#include "ui/base/l10n/l10n_util.h"
#include "ui/events/keycodes/keyboard_codes.h"
#include "ui/gfx/geometry/rect_conversions.h"
#include "ui/gfx/text_utils.h"

using autofill::SuggestionHidingReason;
using autofill::password_generation::PasswordGenerationType;

// Handles registration for key events with RenderFrameHost.
class PasswordGenerationPopupControllerImpl::KeyPressRegistrator {
 public:
  explicit KeyPressRegistrator(content::RenderFrameHost* frame)
      : frame_(frame) {}
  KeyPressRegistrator(const KeyPressRegistrator& rhs) = delete;
  KeyPressRegistrator& operator=(const KeyPressRegistrator& rhs) = delete;

  ~KeyPressRegistrator() = default;

  void RegisterKeyPressHandler(
      content::RenderWidgetHost::KeyPressEventCallback handler) {
    DCHECK(callback_.is_null());
    content::RenderWidgetHostView* view = frame_->GetView();
    if (!view) {
      return;
    }
    view->GetRenderWidgetHost()->AddKeyPressEventCallback(handler);
    callback_ = std::move(handler);
  }

  void RemoveKeyPressHandler() {
    if (!callback_.is_null()) {
      content::RenderWidgetHostView* view = frame_->GetView();
      if (view) {
        view->GetRenderWidgetHost()->RemoveKeyPressEventCallback(callback_);
      }
      callback_.Reset();
    }
  }

 private:
  const raw_ptr<content::RenderFrameHost, DanglingUntriaged> frame_;
  content::RenderWidgetHost::KeyPressEventCallback callback_;
};

base::WeakPtr<PasswordGenerationPopupControllerImpl>
PasswordGenerationPopupControllerImpl::GetOrCreate(
    base::WeakPtr<PasswordGenerationPopupControllerImpl> previous,
    const gfx::RectF& bounds,
    const autofill::password_generation::PasswordGenerationUIData& ui_data,
    const base::WeakPtr<password_manager::PasswordManagerDriver>& driver,
    PasswordGenerationPopupObserver* observer,
    content::WebContents* web_contents,
    content::RenderFrameHost* frame) {
  if (previous.get() && previous->element_bounds() == bounds &&
      previous->web_contents() == web_contents &&
      previous->driver_.get() == driver.get() &&
      previous->generation_element_id_ == ui_data.generation_element_id) {
    return previous;
  }

  if (previous.get()) {
    previous->HideImpl();
  }

  PasswordGenerationPopupControllerImpl* controller =
      new PasswordGenerationPopupControllerImpl(bounds, ui_data, driver,
                                                observer, web_contents, frame);
  return controller->GetWeakPtr();
}

PasswordGenerationPopupControllerImpl::PasswordGenerationPopupControllerImpl(
    const gfx::RectF& bounds,
    const autofill::password_generation::PasswordGenerationUIData& ui_data,
    const base::WeakPtr<password_manager::PasswordManagerDriver>& driver,
    PasswordGenerationPopupObserver* observer,
    content::WebContents* web_contents,
    content::RenderFrameHost* frame)
    : content::WebContentsObserver(web_contents),
      view_(nullptr),
      form_data_(ui_data.form_data),
      driver_(driver),
      observer_(observer),
      form_signature_(autofill::CalculateFormSignature(form_data_)),
      field_signature_(autofill::CalculateFieldSignatureByNameAndType(
          ui_data.generation_element,
          autofill::FormControlType::kInputPassword)),
      generation_element_id_(ui_data.generation_element_id),
      max_length_(ui_data.max_length),
      controller_common_(bounds,
                         ui_data.text_direction,
                         web_contents->GetNativeView()),
      state_(kOfferGeneration),
      key_press_handler_manager_(new KeyPressRegistrator(frame)) {
  // There may not always be a ZoomController, e.g. in tests.
  if (auto* zoom_controller =
          zoom::ZoomController::FromWebContents(web_contents)) {
    zoom_observation_.Observe(zoom_controller);
  }

  help_text_ = l10n_util::GetStringUTF16(
      IDS_PASSWORD_GENERATION_PROMPT_GOOGLE_PASSWORD_MANAGER);
}

PasswordGenerationPopupControllerImpl::
    ~PasswordGenerationPopupControllerImpl() = default;

base::WeakPtr<PasswordGenerationPopupControllerImpl>
PasswordGenerationPopupControllerImpl::GetWeakPtr() {
  return weak_ptr_factory_.GetWeakPtr();
}

bool PasswordGenerationPopupControllerImpl::HandleKeyPressEvent(
    const input::NativeWebKeyboardEvent& event) {
  switch (event.windows_key_code) {
    case ui::VKEY_UP:
    case ui::VKEY_DOWN:
      if (!IsSelectable()) {
        return false;
      }

      SelectElement(cancel_button_selected()
                        ? PasswordGenerationPopupElement::kAcceptButton
                        : PasswordGenerationPopupElement::kCancelButton);
      return true;
    case ui::VKEY_ESCAPE:
      HideImpl();
      return true;
    case ui::VKEY_RETURN:
    case ui::VKEY_TAB:
      // We suppress tab if the password is selected because we will
      // automatically advance focus anyway.
      return PossiblyAcceptSelectedElement();
    default:
      return false;
  }
}

bool PasswordGenerationPopupControllerImpl::IsVisible() const {
  return view_;
}

bool PasswordGenerationPopupControllerImpl::PossiblyAcceptSelectedElement() {
  switch (selected_element_) {
    case PasswordGenerationPopupElement::kAcceptButton:
      PasswordAccepted();
      return true;
    case PasswordGenerationPopupElement::kCancelButton:
      PasswordRejected();
      return true;
    default:
      return false;
  }
}

bool PasswordGenerationPopupControllerImpl::IsSelectable() const {
  return state_ == kOfferGeneration;
}

void PasswordGenerationPopupControllerImpl::SelectElement(
    PasswordGenerationPopupElement element) {
  if (!IsSelectable() || selected_element_ == element) {
    return;
  }

  selected_element_ = element;
  view_->ButtonSelectionUpdated();
}

void PasswordGenerationPopupControllerImpl::PasswordAccepted() {
  if (state_ != kOfferGeneration) {
    return;
  }

  base::WeakPtr<PasswordGenerationPopupControllerImpl> weak_this = GetWeakPtr();
  if (driver_) {
    // See https://crbug.com/1133635 for when `driver_` might be null due to a
    // compromised renderer.
    driver_->GeneratedPasswordAccepted(form_data_, generation_element_id_,
                                       current_generated_password_);
  }
  // |this| can be destroyed here because GeneratedPasswordAccepted pops up
  // another UI and generates some event to close the dropdown.
  if (weak_this) {
    driver_->FocusNextFieldAfterPasswords();
    weak_this->HideImpl();
  }
}

void PasswordGenerationPopupControllerImpl::PasswordRejected() {
  CHECK_EQ(state_, kOfferGeneration);
  if (driver_) {
    driver_->GeneratedPasswordRejected();
  }
  HideImpl();
}

void PasswordGenerationPopupControllerImpl::GeneratePasswordValue(
    PasswordGenerationType generation_type) {
  // New password value should be generated if none currently exists, or if the
  // popup was previously in the editing state.
  if (current_generated_password_.empty() || state_ != kOfferGeneration) {
    current_generated_password_ =
        driver_->GetPasswordGenerationHelper()->GeneratePassword(
            web_contents()->GetLastCommittedURL().DeprecatedGetOriginAsURL(),
            generation_type, form_signature_, field_signature_, max_length_);
  }
}

void PasswordGenerationPopupControllerImpl::Show(GenerationUIState state) {
  CHECK(!current_generated_password_.empty());
  state_ = state;

  if (!view_) {
    view_ = PasswordGenerationPopupView::Create(GetWeakPtr());

    // Treat popup as being hidden if creation fails.
    if (!view_) {
      HideImpl();
      return;
    }
    key_press_handler_manager_->RegisterKeyPressHandler(base::BindRepeating(
        [](base::WeakPtr<PasswordGenerationPopupControllerImpl> weak_this,
           const input::NativeWebKeyboardEvent& event) {
          return weak_this && weak_this->HandleKeyPressEvent(event);
        },
        GetWeakPtr()));
    if (!view_->Show()) {
      // The instance is deleted after this point.
      return;
    }
  } else {
    view_->UpdateState();
    if (!view_->UpdateBoundsAndRedrawPopup()) {
      // The instance is deleted after this point.
      return;
    }
  }

  // Preview password on show in generation state.
  if (state_ == kOfferGeneration) {
    driver_->PreviewGenerationSuggestion(current_generated_password_);

    // For the screen reader users, move the focus to the accept button on show.
    if (ui::AXPlatform::GetInstance().IsScreenReaderActive()) {
      SelectElement(PasswordGenerationPopupElement::kAcceptButton);
    }
  }

  if (observer_) {
    observer_->OnPopupShown(state_);
  }
}

void PasswordGenerationPopupControllerImpl::UpdateGeneratedPassword(
    std::u16string new_password) {
  current_generated_password_ = std::move(new_password);
  if (view_) {
    view_->UpdateGeneratedPasswordValue();
  }
}

void PasswordGenerationPopupControllerImpl::FrameWasScrolled() {
  HideImpl();
}

void PasswordGenerationPopupControllerImpl::GenerationElementLostFocus() {
  HideImpl();
}

void PasswordGenerationPopupControllerImpl::GeneratedPasswordRejected() {
  HideImpl();
}

void PasswordGenerationPopupControllerImpl::WebContentsDestroyed() {
  HideImpl();
}

void PasswordGenerationPopupControllerImpl::PrimaryPageChanged(
    content::Page& page) {
  HideImpl();
}

void PasswordGenerationPopupControllerImpl::OnZoomControllerDestroyed(
    zoom::ZoomController* zoom_controller) {
  zoom_observation_.Reset();
}

void PasswordGenerationPopupControllerImpl::OnZoomChanged(
    const zoom::ZoomController::ZoomChangedEventData& data) {
  HideImpl();
}

void PasswordGenerationPopupControllerImpl::Hide(SuggestionHidingReason) {
  HideImpl();
}

void PasswordGenerationPopupControllerImpl::ViewDestroyed() {
  view_ = nullptr;

  HideImpl();
}

std::u16string PasswordGenerationPopupControllerImpl::GetPrimaryAccountEmail() {
  content::WebContents* web_contents = GetWebContents();
  if (!web_contents) {
    return std::u16string();
  }
  Profile* profile =
      Profile::FromBrowserContext(web_contents->GetBrowserContext());
  signin::IdentityManager* identity_manager =
      IdentityManagerFactory::GetForProfile(profile);
  if (!identity_manager) {
    return std::u16string();
  }
  return base::UTF8ToUTF16(
      identity_manager->GetPrimaryAccountInfo(signin::ConsentLevel::kSignin)
          .email);
}

gfx::NativeView PasswordGenerationPopupControllerImpl::container_view() const {
  return controller_common_.container_view;
}

content::WebContents* PasswordGenerationPopupControllerImpl::GetWebContents()
    const {
  return WebContentsObserver::web_contents();
}

const gfx::RectF& PasswordGenerationPopupControllerImpl::element_bounds()
    const {
  return controller_common_.element_bounds;
}

autofill::PopupAnchorType PasswordGenerationPopupControllerImpl::anchor_type()
    const {
  return controller_common_.anchor_type;
}

base::i18n::TextDirection
PasswordGenerationPopupControllerImpl::GetElementTextDirection() const {
  return controller_common_.text_direction;
}

void PasswordGenerationPopupControllerImpl::HideImpl() {
  // Detach if the frame is still alive.
  if (driver_) {
    key_press_handler_manager_->RemoveKeyPressHandler();
    // The preview might have not been cleared (e.g. popup closed with ESC).
    driver_->ClearPreviewedForm();
  }

  if (view_) {
    view_->Hide();
  }

  if (observer_) {
    observer_->OnPopupHidden();
  }

  delete this;
}

PasswordGenerationPopupController::GenerationUIState
PasswordGenerationPopupControllerImpl::state() const {
  return state_;
}

bool PasswordGenerationPopupControllerImpl::accept_button_selected() const {
  return selected_element_ == PasswordGenerationPopupElement::kAcceptButton;
}

bool PasswordGenerationPopupControllerImpl::cancel_button_selected() const {
  return selected_element_ == PasswordGenerationPopupElement::kCancelButton;
}

const std::u16string& PasswordGenerationPopupControllerImpl::password() const {
  return current_generated_password_;
}

std::u16string PasswordGenerationPopupControllerImpl::SuggestedText() const {
  if (state_ == kEditGeneratedPassword) {
    return l10n_util::GetStringUTF16(
        IDS_PASSWORD_GENERATION_EDITING_SUGGESTION);
  }

  return l10n_util::GetStringUTF16(
      current_generated_password_.size() >=
              autofill::password_generation::kLengthSufficientForStrongLabel
          ? IDS_PASSWORD_GENERATION_SUGGESTION_GPM
          : IDS_PASSWORD_GENERATION_SUGGESTION_GPM_WITHOUT_STRONG);
}

const std::u16string& PasswordGenerationPopupControllerImpl::HelpText() const {
  return help_text_;
}