components/autofill_assistant/browser/controller.cc

// Copyright 2018 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 "components/autofill_assistant/browser/controller.h"

#include <utility>

#include "base/bind.h"
#include "base/callback_helpers.h"
#include "base/json/json_writer.h"
#include "base/no_destructor.h"
#include "base/strings/string_util.h"
#include "base/strings/utf_string_conversions.h"
#include "base/task/post_task.h"
#include "base/time/tick_clock.h"
#include "base/values.h"
#include "components/autofill_assistant/browser/controller_observer.h"
#include "components/autofill_assistant/browser/features.h"
#include "components/autofill_assistant/browser/metrics.h"
#include "components/autofill_assistant/browser/protocol_utils.h"
#include "components/autofill_assistant/browser/service_impl.h"
#include "components/autofill_assistant/browser/trigger_context.h"
#include "components/strings/grit/components_strings.h"
#include "content/public/browser/browser_task_traits.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/navigation_handle.h"
#include "content/public/browser/render_frame_host.h"
#include "content/public/browser/web_contents.h"
#include "ui/base/l10n/l10n_util.h"
#include "url/gurl.h"

namespace autofill_assistant {

namespace {

// The initial progress to set when autostarting and showing the "Loading..."
// message.
static constexpr int kAutostartInitialProgress = 5;

// Parameter that allows setting the color of the overlay.
static const char* const kOverlayColorParameterName = "OVERLAY_COLORS";

}  // namespace

Controller::Controller(content::WebContents* web_contents,
                       Client* client,
                       const base::TickClock* tick_clock,
                       std::unique_ptr<Service> service)
    : content::WebContentsObserver(web_contents),
      client_(client),
      tick_clock_(tick_clock),
      service_(service ? std::move(service)
                       : ServiceImpl::Create(web_contents->GetBrowserContext(),
                                             client_)),
      navigating_to_new_document_(web_contents->IsWaitingForResponse()),
      weak_ptr_factory_(this) {}

Controller::~Controller() = default;

const ClientSettings& Controller::GetSettings() {
  return settings_;
}

const GURL& Controller::GetCurrentURL() {
  const GURL& last_committed = web_contents()->GetLastCommittedURL();
  if (!last_committed.is_empty())
    return last_committed;

  return deeplink_url_;
}

const GURL& Controller::GetDeeplinkURL() {
  return deeplink_url_;
}

Service* Controller::GetService() {
  return service_.get();
}

WebController* Controller::GetWebController() {
  if (!web_controller_) {
    web_controller_ =
        WebController::CreateForWebContents(web_contents(), &settings_);
  }
  return web_controller_.get();
}

ClientMemory* Controller::GetClientMemory() {
  if (!memory_) {
    memory_ = std::make_unique<ClientMemory>();
  }
  return memory_.get();
}

const TriggerContext* Controller::GetTriggerContext() {
  DCHECK(trigger_context_);
  return trigger_context_.get();
}

autofill::PersonalDataManager* Controller::GetPersonalDataManager() {
  return client_->GetPersonalDataManager();
}

content::WebContents* Controller::GetWebContents() {
  return web_contents();
}

void Controller::SetTouchableElementArea(const ElementAreaProto& area) {
  touchable_element_area()->SetFromProto(area);
}

void Controller::SetStatusMessage(const std::string& message) {
  status_message_ = message;
  for (ControllerObserver& observer : observers_) {
    observer.OnStatusMessageChanged(message);
  }
}

std::string Controller::GetStatusMessage() const {
  return status_message_;
}

void Controller::SetBubbleMessage(const std::string& message) {
  bubble_message_ = message;
  for (ControllerObserver& observer : observers_) {
    observer.OnBubbleMessageChanged(message);
  }
}

std::string Controller::GetBubbleMessage() const {
  return bubble_message_;
}

void Controller::SetDetails(std::unique_ptr<Details> details) {
  details_ = std::move(details);
  for (ControllerObserver& observer : observers_) {
    observer.OnDetailsChanged(details_.get());
  }
}

const Details* Controller::GetDetails() const {
  return details_.get();
}

int Controller::GetProgress() const {
  return progress_;
}

void Controller::SetInfoBox(const InfoBox& info_box) {
  if (!info_box_) {
    info_box_ = std::make_unique<InfoBox>();
  }
  *info_box_ = info_box;
  for (ControllerObserver& observer : observers_) {
    observer.OnInfoBoxChanged(info_box_.get());
  }
}

void Controller::ClearInfoBox() {
  info_box_.reset();
  for (ControllerObserver& observer : observers_) {
    observer.OnInfoBoxChanged(nullptr);
  }
}

const InfoBox* Controller::GetInfoBox() const {
  return info_box_.get();
}

void Controller::SetProgress(int progress) {
  // Progress can only increase.
  if (progress_ >= progress)
    return;

  progress_ = progress;
  for (ControllerObserver& observer : observers_) {
    observer.OnProgressChanged(progress);
  }
}

void Controller::SetProgressVisible(bool visible) {
  if (progress_visible_ == visible)
    return;

  progress_visible_ = visible;
  for (ControllerObserver& observer : observers_) {
    observer.OnProgressVisibilityChanged(visible);
  }
}

bool Controller::GetProgressVisible() const {
  return progress_visible_;
}

const std::vector<UserAction>& Controller::GetUserActions() const {
  static const base::NoDestructor<std::vector<UserAction>> no_user_actions_;
  return user_actions_ ? *user_actions_ : *no_user_actions_;
}

void Controller::SetUserActions(
    std::unique_ptr<std::vector<UserAction>> user_actions) {
  if (user_actions) {
    SetDefaultChipType(user_actions.get());
  }
  user_actions_ = std::move(user_actions);
  for (ControllerObserver& observer : observers_) {
    observer.OnUserActionsChanged(GetUserActions());
  }
}

bool Controller::IsNavigatingToNewDocument() {
  return navigating_to_new_document_;
}

bool Controller::HasNavigationError() {
  return navigation_error_;
}

void Controller::AddListener(ScriptExecutorDelegate::Listener* listener) {
  auto found = std::find(listeners_.begin(), listeners_.end(), listener);
  if (found == listeners_.end())
    listeners_.emplace_back(listener);
}

void Controller::RemoveListener(ScriptExecutorDelegate::Listener* listener) {
  auto found = std::find(listeners_.begin(), listeners_.end(), listener);
  if (found != listeners_.end())
    listeners_.erase(found);
}

bool Controller::PerformUserActionWithContext(
    int index,
    std::unique_ptr<TriggerContext> context) {
  if (!user_actions_ || index < 0 ||
      static_cast<size_t>(index) >= user_actions_->size()) {
    NOTREACHED() << "Invalid user action index: " << index;
    return false;
  }

  if (!(*user_actions_)[index].enabled()) {
    NOTREACHED() << "Action at index " << index << " is disabled.";
    return false;
  }

  UserAction user_action = std::move((*user_actions_)[index]);
  SetUserActions(nullptr);
  user_action.Call(std::move(context));
  return true;
}

void Controller::SetResizeViewport(bool resize_viewport) {
  if (resize_viewport == resize_viewport_)
    return;

  resize_viewport_ = resize_viewport;
  for (ControllerObserver& observer : observers_) {
    observer.OnResizeViewportChanged(resize_viewport);
  }
}

void Controller::SetPeekMode(ConfigureBottomSheetProto::PeekMode peek_mode) {
  if (peek_mode == peek_mode_)
    return;

  peek_mode_ = peek_mode;
  for (ControllerObserver& observer : observers_) {
    observer.OnPeekModeChanged(peek_mode);
  }
}

const FormProto* Controller::GetForm() const {
  return form_.get();
}

bool Controller::SetForm(
    std::unique_ptr<FormProto> form,
    base::RepeatingCallback<void(const FormProto::Result*)> callback) {
  form_.reset();
  form_result_.reset();
  form_callback_ = base::DoNothing();

  if (!form) {
    for (ControllerObserver& observer : observers_) {
      observer.OnFormChanged(nullptr);
    }
    return true;
  }

  // Initialize form result. This will return false if the form is invalid or
  // contains unsupported inputs.
  auto form_result = std::make_unique<FormProto::Result>();
  for (FormInputProto& input : *form->mutable_inputs()) {
    FormInputProto::Result* result = form_result->add_input_results();
    switch (input.input_type_case()) {
      case FormInputProto::InputTypeCase::kCounter:
        // Add the initial value of each counter into the form result.
        for (const CounterInputProto::Counter& counter :
             input.counter().counters()) {
          result->mutable_counter()->add_values(counter.initial_value());
        }
        break;
      case FormInputProto::InputTypeCase::kSelection: {
        // Add the initial selected state of each choice into the form result.
        bool has_selected = false;
        for (const SelectionInputProto::Choice& choice :
             input.selection().choices()) {
          if (choice.selected()) {
            if (has_selected && !input.selection().allow_multiple()) {
              // Multiple choices are initially selected even though it is not
              // allowed by the input.
              return false;
            }
            has_selected = true;
          }
          result->mutable_selection()->add_selected(choice.selected());
        }
        break;
      }
      case FormInputProto::InputTypeCase::INPUT_TYPE_NOT_SET:
        DVLOG(1) << "Encountered input with INPUT_TYPE_NOT_SET";
        return false;
        // Intentionally no default case to make compilation fail if a new value
        // was added to the enum but not to this list.
    }
  }

  // Form is valid.
  form_ = std::move(form);
  form_result_ = std::move(form_result);
  form_callback_ = callback;

  // Call the callback with initial result.
  form_callback_.Run(form_result_.get());

  for (ControllerObserver& observer : observers_) {
    observer.OnFormChanged(form_.get());
  }
  return true;
}

void Controller::SetCounterValue(int input_index,
                                 int counter_index,
                                 int value) {
  if (!form_result_ || input_index < 0 ||
      input_index >= form_result_->input_results_size()) {
    NOTREACHED() << "Invalid input index: " << input_index;
    return;
  }

  FormInputProto::Result* input_result =
      form_result_->mutable_input_results(input_index);
  if (!input_result->has_counter() || counter_index < 0 ||
      counter_index >= input_result->counter().values_size()) {
    NOTREACHED() << "Invalid counter index: " << counter_index;
    return;
  }

  input_result->mutable_counter()->set_values(counter_index, value);
  form_callback_.Run(form_result_.get());
}

void Controller::SetChoiceSelected(int input_index,
                                   int choice_index,
                                   bool selected) {
  if (!form_result_ || input_index < 0 ||
      input_index >= form_result_->input_results_size()) {
    NOTREACHED() << "Invalid input index: " << input_index;
    return;
  }

  FormInputProto::Result* input_result =
      form_result_->mutable_input_results(input_index);
  if (!input_result->has_selection() || choice_index < 0 ||
      choice_index >= input_result->selection().selected_size()) {
    NOTREACHED() << "Invalid choice index: " << choice_index;
    return;
  }

  input_result->mutable_selection()->set_selected(choice_index, selected);
  form_callback_.Run(form_result_.get());
}

void Controller::AddObserver(ControllerObserver* observer) {
  observers_.AddObserver(observer);
}

void Controller::RemoveObserver(const ControllerObserver* observer) {
  observers_.RemoveObserver(observer);
}

bool Controller::GetResizeViewport() {
  return resize_viewport_;
}

ConfigureBottomSheetProto::PeekMode Controller::GetPeekMode() {
  return peek_mode_;
}

void Controller::SetOverlayColors(std::unique_ptr<OverlayColors> colors) {
  overlay_colors_ = std::move(colors);
  if (overlay_colors_) {
    for (ControllerObserver& observer : observers_) {
      observer.OnOverlayColorsChanged(*overlay_colors_);
    }
  } else {
    OverlayColors default_colors;
    for (ControllerObserver& observer : observers_) {
      observer.OnOverlayColorsChanged(default_colors);
    }
  }
}

void Controller::GetOverlayColors(OverlayColors* colors) const {
  if (!overlay_colors_)
    return;
  *colors = *overlay_colors_;
}

void Controller::ReportNavigationStateChanged() {
  // Listeners are called in the same order they were added.
  for (auto* listener : listeners_) {
    listener->OnNavigationStateChanged();
  }
}

void Controller::EnterStoppedState() {
  if (script_tracker_)
    script_tracker_->StopScript();

  ClearInfoBox();
  SetDetails(nullptr);
  SetUserActions(nullptr);
  SetPaymentRequestOptions(nullptr);
  EnterState(AutofillAssistantState::STOPPED);
}

void Controller::EnterState(AutofillAssistantState state) {
  if (state_ == state)
    return;

  DVLOG(2) << __func__ << ": " << state_ << " -> " << state;

  // The only valid way of leaving the STOPPED state is to go back to tracking
  // mode.
  DCHECK(state_ != AutofillAssistantState::STOPPED ||
         (state == AutofillAssistantState::TRACKING && tracking_));

  bool old_needs_ui = NeedsUI();
  state_ = state;

  for (ControllerObserver& observer : observers_) {
    observer.OnStateChanged(state);
  }

  if (!old_needs_ui && NeedsUI())
    client_->AttachUI();

  if (ShouldCheckScripts()) {
    GetOrCheckScripts();
  } else {
    StopPeriodicScriptChecks();
  }
}

void Controller::SetWebControllerForTest(
    std::unique_ptr<WebController> web_controller) {
  web_controller_ = std::move(web_controller);
}

void Controller::OnUrlChange() {
  if (state_ == AutofillAssistantState::STOPPED) {
    PerformDelayedShutdownIfNecessary();
    return;
  }

  GetOrCheckScripts();
}

bool Controller::ShouldCheckScripts() {
  return state_ == AutofillAssistantState::TRACKING ||
         state_ == AutofillAssistantState::STARTING ||
         state_ == AutofillAssistantState::AUTOSTART_FALLBACK_PROMPT ||
         (state_ == AutofillAssistantState::PROMPT &&
          (!script_tracker_ || !script_tracker_->running()));
}

void Controller::GetOrCheckScripts() {
  if (!ShouldCheckScripts())
    return;

  const GURL& url = GetCurrentURL();
  if (script_domain_ != url.host()) {
    StopPeriodicScriptChecks();
    script_domain_ = url.host();
    DVLOG(2) << "GetScripts for " << script_domain_;
    GetService()->GetScriptsForUrl(
        url, *trigger_context_,
        base::BindOnce(&Controller::OnGetScripts, base::Unretained(this), url));
  } else {
    script_tracker()->CheckScripts();
    StartPeriodicScriptChecks();
  }
}

void Controller::StartPeriodicScriptChecks() {
  periodic_script_check_count_ = settings_.periodic_script_check_count;
  // If periodic checks are running, setting periodic_script_check_count_ keeps
  // them running longer.
  if (periodic_script_check_scheduled_)
    return;
  periodic_script_check_scheduled_ = true;
  base::PostDelayedTaskWithTraits(
      FROM_HERE, {content::BrowserThread::UI},
      base::BindOnce(&Controller::OnPeriodicScriptCheck,
                     weak_ptr_factory_.GetWeakPtr()),
      settings_.periodic_script_check_interval);
}

void Controller::StopPeriodicScriptChecks() {
  periodic_script_check_count_ = 0;
}

void Controller::OnPeriodicScriptCheck() {
  if (periodic_script_check_count_ > 0) {
    periodic_script_check_count_--;
  }

  if (periodic_script_check_count_ <= 0 && !allow_autostart()) {
    DCHECK_EQ(0, periodic_script_check_count_);
    periodic_script_check_scheduled_ = false;
    return;
  }

  if (allow_autostart() && !autostart_timeout_script_path_.empty() &&
      tick_clock_->NowTicks() >= absolute_autostart_timeout_) {
    DVLOG(1) << __func__ << " giving up waiting on autostart.";
    std::string script_path = autostart_timeout_script_path_;
    autostart_timeout_script_path_.clear();
    periodic_script_check_scheduled_ = false;
    ExecuteScript(script_path, TriggerContext::CreateEmpty(), state_);
    return;
  }

  script_tracker()->CheckScripts();
  base::PostDelayedTaskWithTraits(
      FROM_HERE, {content::BrowserThread::UI},
      base::BindOnce(&Controller::OnPeriodicScriptCheck,
                     weak_ptr_factory_.GetWeakPtr()),
      settings_.periodic_script_check_interval);
}

void Controller::OnGetScripts(const GURL& url,
                              bool result,
                              const std::string& response) {
  if (state_ == AutofillAssistantState::STOPPED)
    return;

  // If the domain of the current URL changed since the request was sent, the
  // response is not relevant anymore and can be safely discarded.
  if (url.host() != script_domain_)
    return;

  if (!result) {
    DVLOG(1) << "Failed to get assistant scripts for " << script_domain_;
    OnFatalError(l10n_util::GetStringUTF8(IDS_AUTOFILL_ASSISTANT_DEFAULT_ERROR),
                 Metrics::DropOutReason::GET_SCRIPTS_FAILED);
    return;
  }

  SupportsScriptResponseProto response_proto;
  if (!response_proto.ParseFromString(response)) {
    DVLOG(2) << __func__ << " from " << script_domain_ << " returned "
             << "unparseable response";
    OnFatalError(l10n_util::GetStringUTF8(IDS_AUTOFILL_ASSISTANT_DEFAULT_ERROR),
                 Metrics::DropOutReason::GET_SCRIPTS_UNPARSABLE);
    return;
  }
  if (response_proto.has_client_settings())
    settings_.UpdateFromProto(response_proto.client_settings());

  std::vector<std::unique_ptr<Script>> scripts;
  for (const auto& script_proto : response_proto.scripts()) {
    ProtocolUtils::AddScript(script_proto, &scripts);
  }

  autostart_timeout_script_path_ =
      response_proto.script_timeout_error().script_path();
  autostart_timeout_ = base::TimeDelta::FromMilliseconds(
      response_proto.script_timeout_error().timeout_ms());
  if (allow_autostart())
    absolute_autostart_timeout_ = tick_clock_->NowTicks() + autostart_timeout_;

  DVLOG(2) << __func__ << " from " << script_domain_ << " returned "
           << scripts.size() << " scripts";
  if (VLOG_IS_ON(3)) {
    for (const auto& script : scripts) {
      // Strip domain from beginning if possible (redundant with log above).
      auto pos = script->handle.path.find(script_domain_);
      if (pos == 0) {
        DVLOG(3) << "\t" << script->handle.path.substr(script_domain_.length());
      } else {
        DVLOG(3) << "\t" << script->handle.path;
      }
    }
  }

  if (scripts.empty()) {
    script_tracker()->SetScripts({});

    if (state_ == AutofillAssistantState::TRACKING) {
      OnFatalError(
          l10n_util::GetStringUTF8(IDS_AUTOFILL_ASSISTANT_DEFAULT_ERROR),
          Metrics::DropOutReason::NO_SCRIPTS);
      return;
    }
    OnNoRunnableScriptsForPage();
  }

  script_tracker()->SetScripts(std::move(scripts));
  GetOrCheckScripts();
}

void Controller::ExecuteScript(const std::string& script_path,
                               std::unique_ptr<TriggerContext> context,
                               AutofillAssistantState end_state) {
  DCHECK(!script_tracker()->running());

  EnterState(AutofillAssistantState::RUNNING);

  touchable_element_area()->Clear();

  // Runnable scripts will be checked and reported if necessary after executing
  // the script.
  script_tracker_->ClearRunnableScripts();
  SetUserActions(nullptr);
  // TODO(crbug.com/806868): Consider making ClearRunnableScripts part of
  // ExecuteScripts to simplify the controller.
  script_tracker()->ExecuteScript(
      script_path, std::move(context),
      base::BindOnce(&Controller::OnScriptExecuted,
                     // script_tracker_ is owned by Controller.
                     base::Unretained(this), script_path, end_state));
}

void Controller::OnScriptExecuted(const std::string& script_path,
                                  AutofillAssistantState end_state,
                                  const ScriptExecutor::Result& result) {
  if (!result.success) {
    DVLOG(1) << "Failed to execute script " << script_path;
    OnScriptError(
        l10n_util::GetStringUTF8(IDS_AUTOFILL_ASSISTANT_DEFAULT_ERROR),
        Metrics::DropOutReason::SCRIPT_FAILED);
    return;
  }

  if (result.touchable_element_area) {
    touchable_element_area()->SetFromProto(*result.touchable_element_area);
  }

  switch (result.at_end) {
    case ScriptExecutor::SHUTDOWN:
      if (!tracking_) {
        client_->Shutdown(Metrics::DropOutReason::SCRIPT_SHUTDOWN);
        return;
      }
      end_state = AutofillAssistantState::TRACKING;
      break;

    case ScriptExecutor::SHUTDOWN_GRACEFULLY:
      if (!tracking_) {
        EnterStoppedState();
        client_->Shutdown(Metrics::DropOutReason::SCRIPT_SHUTDOWN);
        return;
      }
      end_state = AutofillAssistantState::TRACKING;
      break;

    case ScriptExecutor::CLOSE_CUSTOM_TAB:
      for (ControllerObserver& observer : observers_) {
        observer.CloseCustomTab();
      }
      if (!tracking_) {
        client_->Shutdown(Metrics::DropOutReason::CUSTOM_TAB_CLOSED);
        return;
      }
      end_state = AutofillAssistantState::TRACKING;
      return;

    case ScriptExecutor::RESTART:
      script_tracker_.reset();
      memory_.reset();
      script_domain_ = "";
      break;

    case ScriptExecutor::CONTINUE:
      break;

    default:
      DVLOG(1) << "Unexpected value for at_end: " << result.at_end;
      break;
  }
  EnterState(end_state);
}

bool Controller::MaybeAutostartScript(
    const std::vector<ScriptHandle>& runnable_scripts) {
  // Under specific conditions, we can directly run a non-interrupt script
  // without first displaying it. This is meant to work only at the very
  // beginning, when no scripts have run, and only if there's exactly one
  // autostartable script.
  if (!allow_autostart())
    return false;

  int autostart_count = 0;
  std::string autostart_path;
  for (const auto& script : runnable_scripts) {
    if (script.autostart) {
      autostart_count++;
      autostart_path = script.path;
    }
  }
  if (autostart_count == 1) {
    ExecuteScript(autostart_path, TriggerContext::CreateEmpty(),
                  AutofillAssistantState::PROMPT);
    return true;
  }
  return false;
}

void Controller::InitFromParameters() {
  auto details = std::make_unique<Details>();
  if (details->UpdateFromParameters(*trigger_context_))
    SetDetails(std::move(details));

  const base::Optional<std::string> overlay_color =
      trigger_context_->GetParameter(kOverlayColorParameterName);
  if (overlay_color) {
    std::unique_ptr<OverlayColors> colors = std::make_unique<OverlayColors>();
    std::vector<std::string> color_strings =
        base::SplitString(overlay_color.value(), ":", base::KEEP_WHITESPACE,
                          base::SPLIT_WANT_ALL);
    if (color_strings.size() > 0) {
      colors->background = color_strings[0];
    }
    if (color_strings.size() > 1) {
      colors->highlight_border = color_strings[1];
    }
    // Ignore other colors, to allow future versions of the client to support
    // setting more colors.

    SetOverlayColors(std::move(colors));
  }
}

void Controller::Track(std::unique_ptr<TriggerContext> trigger_context,
                       base::OnceCallback<void()> on_first_check_done) {
  tracking_ = true;

  if (state_ == AutofillAssistantState::INACTIVE) {
    trigger_context_ = std::move(trigger_context);
    InitFromParameters();
    EnterState(AutofillAssistantState::TRACKING);
  }

  if (on_first_check_done) {
    if (has_run_first_check_) {
      std::move(on_first_check_done).Run();
    } else {
      on_has_run_first_check_.emplace_back(std::move(on_first_check_done));
    }
  }
}

bool Controller::NeedsUI() const {
  return state_ != AutofillAssistantState::INACTIVE &&
         state_ != AutofillAssistantState::TRACKING &&
         state_ != AutofillAssistantState::STOPPED;
}

bool Controller::Start(const GURL& deeplink_url,
                       std::unique_ptr<TriggerContext> trigger_context) {
  if (state_ != AutofillAssistantState::INACTIVE &&
      state_ != AutofillAssistantState::TRACKING)
    return false;

  trigger_context_ = std::move(trigger_context);
  InitFromParameters();
  deeplink_url_ = deeplink_url;

  // Force a re-evaluation of the script, to get a chance to autostart.
  if (state_ == AutofillAssistantState::TRACKING)
    script_tracker_->ClearRunnableScripts();

  SetStatusMessage(l10n_util::GetStringFUTF8(
      IDS_AUTOFILL_ASSISTANT_LOADING, base::UTF8ToUTF16(deeplink_url_.host())));
  SetProgress(kAutostartInitialProgress);
  EnterState(AutofillAssistantState::STARTING);
  return true;
}

AutofillAssistantState Controller::GetState() {
  return state_;
}

void Controller::OnScriptSelected(const std::string& script_path,
                                  std::unique_ptr<TriggerContext> context) {
  DCHECK(!script_path.empty());
  ExecuteScript(script_path, std::move(context),
                state_ == AutofillAssistantState::TRACKING
                    ? AutofillAssistantState::TRACKING
                    : AutofillAssistantState::PROMPT);
}

void Controller::UpdateTouchableArea() {
  touchable_element_area()->Update();
}

void Controller::OnUserInteractionInsideTouchableArea() {
  GetOrCheckScripts();
}

std::string Controller::GetDebugContext() {
  base::Value dict(base::Value::Type::DICTIONARY);

  dict.SetKey("status", base::Value(status_message_));
  if (trigger_context_) {
    google::protobuf::RepeatedPtrField<ScriptParameterProto> parameters_proto;
    trigger_context_->AddParameters(&parameters_proto);
    std::vector<base::Value> parameters_js;
    for (const auto& parameter_proto : parameters_proto) {
      base::Value parameter_js = base::Value(base::Value::Type::DICTIONARY);
      parameter_js.SetKey(parameter_proto.name(),
                          base::Value(parameter_proto.value()));
      parameters_js.push_back(std::move(parameter_js));
    }
    dict.SetKey("parameters", base::Value(parameters_js));
  }
  dict.SetKey("scripts", script_tracker()->GetDebugContext());

  if (details_)
    dict.SetKey("details", details_->GetDebugContext());

  std::string output_js;
  base::JSONWriter::Write(dict, &output_js);
  return output_js;
}

const PaymentRequestOptions* Controller::GetPaymentRequestOptions() const {
  return payment_request_options_.get();
}

const PaymentInformation* Controller::GetPaymentRequestInformation() const {
  return payment_request_info_.get();
}

void Controller::OnPaymentRequestContinueButtonClicked() {
  if (!payment_request_options_ || !payment_request_info_)
    return;

  auto callback = std::move(payment_request_options_->confirm_callback);
  auto payment_request_info = std::move(payment_request_info_);

  // TODO(crbug.com/806868): succeed is currently always true, but we might want
  // to set it to false and propagate the result to GetPaymentInformationAction
  // when the user clicks "Cancel" during that action.
  payment_request_info->succeed = true;

  SetPaymentRequestOptions(nullptr);
  std::move(callback).Run(std::move(payment_request_info));
}

void Controller::OnPaymentRequestAdditionalActionTriggered(int index) {
  if (!payment_request_options_)
    return;

  auto callback =
      std::move(payment_request_options_->additional_actions_callback);
  SetPaymentRequestOptions(nullptr);
  std::move(callback).Run(index);
}

void Controller::OnTermsAndConditionsLinkClicked(int link) {
  if (!payment_request_info_)
    return;

  auto callback = std::move(payment_request_options_->terms_link_callback);
  SetPaymentRequestOptions(nullptr);
  std::move(callback).Run(link);
}

void Controller::SetShippingAddress(
    std::unique_ptr<autofill::AutofillProfile> address) {
  if (!payment_request_info_)
    return;

  payment_request_info_->shipping_address = std::move(address);
  for (ControllerObserver& observer : observers_) {
    observer.OnPaymentRequestInformationChanged(payment_request_info_.get());
  }
  UpdatePaymentRequestActions();
}

void Controller::SetBillingAddress(
    std::unique_ptr<autofill::AutofillProfile> address) {
  if (!payment_request_info_)
    return;

  payment_request_info_->billing_address = std::move(address);
  for (ControllerObserver& observer : observers_) {
    observer.OnPaymentRequestInformationChanged(payment_request_info_.get());
  }
  UpdatePaymentRequestActions();
}

void Controller::SetContactInfo(std::string name,
                                std::string phone,
                                std::string email) {
  if (!payment_request_info_)
    return;

  payment_request_info_->payer_name = name;
  payment_request_info_->payer_phone = phone;
  payment_request_info_->payer_email = email;
  for (ControllerObserver& observer : observers_) {
    observer.OnPaymentRequestInformationChanged(payment_request_info_.get());
  }
  UpdatePaymentRequestActions();
}

void Controller::SetCreditCard(std::unique_ptr<autofill::CreditCard> card) {
  if (!payment_request_info_)
    return;

  payment_request_info_->card = std::move(card);
  for (ControllerObserver& observer : observers_) {
    observer.OnPaymentRequestInformationChanged(payment_request_info_.get());
  }
  UpdatePaymentRequestActions();
}

void Controller::SetTermsAndConditions(
    TermsAndConditionsState terms_and_conditions) {
  if (!payment_request_info_)
    return;

  payment_request_info_->terms_and_conditions = terms_and_conditions;
  UpdatePaymentRequestActions();
  for (ControllerObserver& observer : observers_) {
    observer.OnPaymentRequestInformationChanged(payment_request_info_.get());
  }
}

void Controller::UpdatePaymentRequestActions() {
  // TODO(crbug.com/806868): This method uses #SetUserActions(), which means
  // that updating the PR action buttons will also clear the suggestions. We
  // should update the action buttons only if there are use cases of PR +
  // suggestions.
  if (!payment_request_options_ || !payment_request_info_) {
    SetUserActions(nullptr);
    return;
  }

  bool contact_info_ok = (!payment_request_options_->request_payer_name ||
                          !payment_request_info_->payer_name.empty()) &&
                         (!payment_request_options_->request_payer_email ||
                          !payment_request_info_->payer_email.empty()) &&
                         (!payment_request_options_->request_payer_phone ||
                          !payment_request_info_->payer_phone.empty());

  bool shipping_address_ok = !payment_request_options_->request_shipping ||
                             payment_request_info_->shipping_address;

  bool payment_method_ok = !payment_request_options_->request_payment_method ||
                           payment_request_info_->card;

  bool terms_ok =
      payment_request_info_->terms_and_conditions != NOT_SELECTED ||
      payment_request_options_->accept_terms_and_conditions_text.empty();

  bool confirm_button_enabled =
      contact_info_ok && shipping_address_ok && payment_method_ok && terms_ok;

  UserAction confirm(payment_request_options_->confirm_action);
  confirm.SetEnabled(confirm_button_enabled);
  if (confirm_button_enabled) {
    confirm.SetCallback(
        base::BindOnce(&Controller::OnPaymentRequestContinueButtonClicked,
                       weak_ptr_factory_.GetWeakPtr()));
  }

  auto user_actions = std::make_unique<std::vector<UserAction>>();
  user_actions->emplace_back(std::move(confirm));

  // Add additional actions.
  for (size_t i = 0; i < payment_request_options_->additional_actions.size();
       ++i) {
    auto action = payment_request_options_->additional_actions[i];
    user_actions->push_back({action.chip(), action.direct_action()});
    user_actions->back().SetCallback(
        base::BindOnce(&Controller::OnPaymentRequestAdditionalActionTriggered,
                       weak_ptr_factory_.GetWeakPtr(), i));
  }

  SetUserActions(std::move(user_actions));
}

void Controller::GetTouchableArea(std::vector<RectF>* area) const {
  if (touchable_element_area_)
    touchable_element_area_->GetTouchableRectangles(area);
}

void Controller::GetRestrictedArea(std::vector<RectF>* area) const {
  if (touchable_element_area_)
    touchable_element_area_->GetRestrictedRectangles(area);
}

void Controller::GetVisualViewport(RectF* visual_viewport) const {
  if (touchable_element_area_)
    touchable_element_area_->GetVisualViewport(visual_viewport);
}

void Controller::OnScriptError(const std::string& error_message,
                               Metrics::DropOutReason reason) {
  if (state_ == AutofillAssistantState::STOPPED)
    return;

  SetStatusMessage(error_message);
  EnterStoppedState();

  if (tracking_) {
    EnterState(AutofillAssistantState::TRACKING);
    return;
  }

  client_->Shutdown(reason);
}

void Controller::OnFatalError(const std::string& error_message,
                              Metrics::DropOutReason reason) {
  LOG(ERROR) << "Autofill Assistant has encountered a fatal error and is "
                "shutting down, reason="
             << reason;
  if (state_ == AutofillAssistantState::STOPPED)
    return;

  SetStatusMessage(error_message);
  EnterStoppedState();

  // If we haven't managed to check the set of scripts yet at this point, we
  // never will.
  MaybeReportFirstCheckDone();

  if (tracking_ && script_domain_ == GetCurrentURL().host()) {
    // When tracking the controller should stays until the browser has navigated
    // away from the last domain that was checked to be able to tell callers
    // that the set of user actions is empty.
    delayed_shutdown_reason_ = reason;
    return;
  }

  client_->Shutdown(reason);
}

void Controller::PerformDelayedShutdownIfNecessary() {
  if (delayed_shutdown_reason_ && script_domain_ != GetCurrentURL().host()) {
    Metrics::DropOutReason reason = delayed_shutdown_reason_.value();
    delayed_shutdown_reason_ = base::nullopt;
    client_->Shutdown(reason);
  }
}

void Controller::MaybeReportFirstCheckDone() {
  if (has_run_first_check_)
    return;

  has_run_first_check_ = true;

  while (!on_has_run_first_check_.empty()) {
    std::move(on_has_run_first_check_.back()).Run();
    on_has_run_first_check_.pop_back();
  }
}

void Controller::OnNoRunnableScriptsForPage() {
  if (script_tracker()->running())
    return;

  switch (state_) {
    case AutofillAssistantState::STARTING:
      // We're still waiting for the set of initial scripts, but either didn't
      // get any scripts or didn't get scripts that could possibly become
      // runnable with a DOM change.
      OnScriptError(
          l10n_util::GetStringUTF8(IDS_AUTOFILL_ASSISTANT_DEFAULT_ERROR),
          Metrics::DropOutReason::NO_INITIAL_SCRIPTS);
      break;

    case AutofillAssistantState::PROMPT:
    case AutofillAssistantState::AUTOSTART_FALLBACK_PROMPT:
      // The user has navigated to a page that has no scripts or the scripts
      // have reached a state from which they cannot recover through a DOM
      // change.
      OnScriptError(l10n_util::GetStringUTF8(IDS_AUTOFILL_ASSISTANT_GIVE_UP),
                    Metrics::DropOutReason::NO_SCRIPTS);
      break;

    default:
      // Always having a set of scripts to potentially run is not required in
      // other states.
      break;
  }
}

void Controller::OnRunnableScriptsChanged(
    const std::vector<ScriptHandle>& runnable_scripts) {
  base::ScopedClosureRunner report_first_check;
  if (!has_run_first_check_) {
    // Only report first check done once we're done processing the given set of
    // scripts - whatever the outcome - so callers can see that outcome in the
    // state of the controller.
    report_first_check.ReplaceClosure(
        base::BindOnce(&Controller::MaybeReportFirstCheckDone,
                       weak_ptr_factory_.GetWeakPtr()));
  }

  // Script selection is disabled when a script is already running. We will
  // check again and maybe update when the current script has finished.
  if (script_tracker()->running() || state_ == AutofillAssistantState::STOPPED)
    return;

  if (MaybeAutostartScript(runnable_scripts)) {
    return;
  }

  // Show the initial prompt if available.
  for (const auto& script : runnable_scripts) {
    // runnable_scripts is ordered by priority.
    if (!script.initial_prompt.empty()) {
      SetStatusMessage(script.initial_prompt);
      break;
    }
  }

  // Update the set of user actions to report.
  auto user_actions = std::make_unique<std::vector<UserAction>>();
  for (const auto& script : runnable_scripts) {
    UserAction user_action;
    user_action.chip() = script.chip;
    user_action.direct_action() = script.direct_action;
    if (!user_action.has_triggers())
      continue;

    user_action.SetCallback(base::BindOnce(&Controller::OnScriptSelected,
                                           weak_ptr_factory_.GetWeakPtr(),
                                           script.path));
    user_actions->emplace_back(std::move(user_action));
  }

  // Change state, if necessary.
  switch (state_) {
    case AutofillAssistantState::TRACKING:
    case AutofillAssistantState::AUTOSTART_FALLBACK_PROMPT:
    case AutofillAssistantState::PROMPT:
      // Don't change state
      break;

    case AutofillAssistantState::STARTING:
      if (!user_actions->empty())
        EnterState(AutofillAssistantState::AUTOSTART_FALLBACK_PROMPT);
      break;

    default:
      if (!user_actions->empty())
        EnterState(AutofillAssistantState::PROMPT);
  }
  SetUserActions(std::move(user_actions));
}

void Controller::DidAttachInterstitialPage() {
  client_->Shutdown(Metrics::DropOutReason::INTERSTITIAL_PAGE);
}

void Controller::DidFinishLoad(content::RenderFrameHost* render_frame_host,
                               const GURL& validated_url) {
  // validated_url might not be the page URL. Ignore it and always check the
  // last committed url.
  OnUrlChange();
}

void Controller::DidStartNavigation(
    content::NavigationHandle* navigation_handle) {
  if (!navigation_handle->IsInMainFrame() ||
      navigation_handle->IsSameDocument())
    return;

  if (!navigating_to_new_document_) {
    navigating_to_new_document_ = true;
    ReportNavigationStateChanged();
  }

  // The following types of navigations are allowed for the main frame, when
  // in PROMPT state:
  //  - first-time URL load
  //  - script-directed navigation, while a script is running unless
  //    there's a touchable area.
  //  - server redirections, which might happen outside of a script, but
  //    because of a load triggered by a previously-running script.
  //  - same-document modifications, which might happen automatically
  //  - javascript-initiated navigation or refresh
  //  - navigation by clicking on a link
  //  In the last two cases, autofill assistant might still give up later on if
  //  it discovers that the new page has no scripts.
  //
  // Everything else, such as going back to a previous page, or refreshing the
  // page is considered an end condition.
  if (state_ == AutofillAssistantState::PROMPT &&
      web_contents()->GetLastCommittedURL().is_valid() &&
      !navigation_handle->WasServerRedirect() &&
      !navigation_handle->IsRendererInitiated()) {
    OnScriptError(l10n_util::GetStringUTF8(IDS_AUTOFILL_ASSISTANT_GIVE_UP),
                  Metrics::DropOutReason::NAVIGATION);
  }
}

void Controller::DidFinishNavigation(
    content::NavigationHandle* navigation_handle) {
  if (!navigation_handle->IsInMainFrame() ||
      navigation_handle->IsSameDocument() ||
      !navigation_handle->HasCommitted() || !IsNavigatingToNewDocument()) {
    return;
  }

  bool is_successful =
      !navigation_handle->IsErrorPage() &&
      navigation_handle->GetNetErrorCode() == net::OK &&
      navigation_handle->GetResponseHeaders() &&
      (navigation_handle->GetResponseHeaders()->response_code() / 100) == 2;
  navigation_error_ = !is_successful;
  navigating_to_new_document_ = false;
  ReportNavigationStateChanged();

  if (is_successful)
    OnUrlChange();
}

void Controller::DocumentAvailableInMainFrame() {
  OnUrlChange();
}

void Controller::RenderProcessGone(base::TerminationStatus status) {
  client_->Shutdown(Metrics::DropOutReason::RENDER_PROCESS_GONE);
}

void Controller::OnWebContentsFocused(
    content::RenderWidgetHost* render_widget_host) {
  if (NeedsUI() &&
      base::FeatureList::IsEnabled(features::kAutofillAssistantChromeEntry)) {
    // Show UI again when re-focused in case the web contents moved activity.
    // This is only enabled when tab-switching is enabled.
    client_->AttachUI();
  }
}

void Controller::OnTouchableAreaChanged(
    const RectF& visual_viewport,
    const std::vector<RectF>& touchable_areas,
    const std::vector<RectF>& restricted_areas) {
  for (ControllerObserver& observer : observers_) {
    observer.OnTouchableAreaChanged(visual_viewport, touchable_areas,
                                    restricted_areas);
  }
}

void Controller::SetPaymentRequestOptions(
    std::unique_ptr<PaymentRequestOptions> options) {
  DCHECK(!options ||
         (options->confirm_callback && options->additional_actions_callback &&
          options->terms_link_callback));

  if (payment_request_options_ == nullptr && options == nullptr)
    return;

  if (options) {
    payment_request_info_ = std::make_unique<PaymentInformation>();

    // TODO(crbug.com/806868): set initial state according to proto.
    payment_request_info_->terms_and_conditions =
        options->initial_terms_and_conditions;
  }

  payment_request_options_ = std::move(options);
  UpdatePaymentRequestActions();
  for (ControllerObserver& observer : observers_) {
    observer.OnPaymentRequestOptionsChanged(payment_request_options_.get());
    observer.OnPaymentRequestInformationChanged(payment_request_info_.get());
  }
}

ElementArea* Controller::touchable_element_area() {
  if (!touchable_element_area_) {
    touchable_element_area_ = std::make_unique<ElementArea>(this);
    touchable_element_area_->SetOnUpdate(base::BindRepeating(
        &Controller::OnTouchableAreaChanged, weak_ptr_factory_.GetWeakPtr()));
  }
  return touchable_element_area_.get();
}

ScriptTracker* Controller::script_tracker() {
  if (!script_tracker_) {
    script_tracker_ = std::make_unique<ScriptTracker>(/* delegate= */ this,
                                                      /* listener= */ this);
  }
  return script_tracker_.get();
}

}  // namespace autofill_assistant