// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "components/payments/content/secure_payment_confirmation_controller.h"

#include "base/check.h"
#include "base/feature_list.h"
#include "base/functional/bind.h"
#include "base/location.h"
#include "base/metrics/histogram_functions.h"
#include "base/strings/strcat.h"
#include "base/strings/utf_string_conversions.h"
#include "base/task/single_thread_task_runner.h"
#include "build/build_config.h"
#include "components/payments/content/content_payment_request_delegate.h"
#include "components/payments/content/payment_request.h"
#include "components/payments/content/secure_payment_confirmation_app.h"
#include "components/payments/content/secure_payment_confirmation_transaction_mode.h"
#include "components/payments/core/currency_formatter.h"
#include "components/payments/core/features.h"
#include "components/payments/core/method_strings.h"
#include "components/strings/grit/components_strings.h"
#include "components/url_formatter/elide_url.h"
#include "third_party/blink/public/common/features_generated.h"
#include "ui/base/l10n/l10n_util.h"
#include "url/url_constants.h"

namespace payments {

SecurePaymentConfirmationController::SecurePaymentConfirmationController(
    base::WeakPtr<PaymentRequest> request)
    : request_(request) {
  DCHECK(request_);
}

SecurePaymentConfirmationController::~SecurePaymentConfirmationController() =
    default;

void SecurePaymentConfirmationController::ShowDialog() {
#if BUILDFLAG(IS_ANDROID)
  NOTREACHED();
#else
  if (!request_ || !request_->spec())
    return;

  if (!request_->state()->IsInitialized()) {
    number_of_initialization_tasks_++;
    request_->state()->AddInitializationObserver(this);
  }

  if (!request_->spec()->IsInitialized()) {
    number_of_initialization_tasks_++;
    request_->spec()->AddInitializationObserver(this);
  }

  if (number_of_initialization_tasks_ == 0)
    SetupModelAndShowDialogIfApplicable();
#endif  // BUILDFLAG(IS_ANDROID)
}

void SecurePaymentConfirmationController::
    SetupModelAndShowDialogIfApplicable() {
  DCHECK(!view_);
  // If no apps are available then don't show any UI. The payment_request.cc
  // code will reject the PaymentRequest.show() call with appropriate error
  // message on its own.
  if (!request_ || !request_->state() || !request_->spec() ||
      request_->state()->available_apps().empty()) {
    return;
  }

  if (!request_->web_contents() || !request_->state()->selected_app() ||
      request_->state()->selected_app()->type() != PaymentApp::Type::INTERNAL ||
      request_->state()->selected_app()->GetAppMethodNames().size() != 1 ||
      *request_->state()->selected_app()->GetAppMethodNames().begin() !=
          methods::kSecurePaymentConfirmation ||
      request_->state()->available_apps().size() != 1 || !request_->spec() ||
      !request_->spec()->IsSecurePaymentConfirmationRequested() ||
      request_->spec()->request_shipping() ||
      request_->spec()->request_payer_name() ||
      request_->spec()->request_payer_email() ||
      request_->spec()->request_payer_phone() ||
      request_->spec()->method_data().size() != 1 ||
      !request_->spec()->method_data().front() ||
      request_->spec()->method_data().front()->supported_method !=
          methods::kSecurePaymentConfirmation ||
      !request_->spec()->method_data().front()->secure_payment_confirmation ||
      (request_->spec()
           ->method_data()
           .front()
           ->secure_payment_confirmation->payee_origin.has_value() &&
       request_->spec()
               ->method_data()
               .front()
               ->secure_payment_confirmation->payee_origin->scheme() !=
           url::kHttpsScheme)) {
    OnCancel();
    return;
  }

  model_.set_verify_button_label(l10n_util::GetStringUTF16(
      IDS_SECURE_PAYMENT_CONFIRMATION_VERIFY_BUTTON_LABEL));
  model_.set_cancel_button_label(l10n_util::GetStringUTF16(IDS_CANCEL));
  model_.set_progress_bar_visible(false);

  model_.set_title(l10n_util::GetStringUTF16(
      IDS_SECURE_PAYMENT_CONFIRMATION_VERIFY_PURCHASE));

  model_.set_merchant_label(
      l10n_util::GetStringUTF16(IDS_SECURE_PAYMENT_CONFIRMATION_STORE_LABEL));
  std::optional<std::string>& payee_name =
      request_->spec()
          ->method_data()
          .front()
          ->secure_payment_confirmation->payee_name;
  if (payee_name.has_value()) {
    model_.set_merchant_name(
        std::optional<std::u16string>(base::UTF8ToUTF16(payee_name.value())));
  }
  std::optional<url::Origin>& origin =
      request_->spec()
          ->method_data()
          .front()
          ->secure_payment_confirmation->payee_origin;
  if (origin.has_value()) {
    model_.set_merchant_origin(std::optional<std::u16string>(
        url_formatter::FormatUrlForSecurityDisplay(
            origin.value().GetURL(),
            url_formatter::SchemeDisplay::OMIT_CRYPTOGRAPHIC)));
  }

  SecurePaymentConfirmationApp* app =
      static_cast<SecurePaymentConfirmationApp*>(
          request_->state()->selected_app());

  model_.set_instrument_label(l10n_util::GetStringUTF16(
      IDS_PAYMENT_REQUEST_PAYMENT_METHOD_SECTION_NAME));
  model_.set_instrument_value(app->GetLabel());
  model_.set_instrument_icon(app->icon_bitmap());

  model_.set_total_label(
      l10n_util::GetStringUTF16(IDS_SECURE_PAYMENT_CONFIRMATION_TOTAL_LABEL));
  const mojom::PaymentItemPtr& total = request_->spec()->GetTotal(app);
  std::u16string total_value = base::UTF8ToUTF16(total->amount->currency);
  model_.set_total_value(
      base::StrCat({base::UTF8ToUTF16(total->amount->currency), u" ",
                    CurrencyFormatter(total->amount->currency,
                                      request_->state()->GetApplicationLocale())
                        .Format(total->amount->value)}));

  model_.set_opt_out_visible(request_->spec()
                                 ->method_data()
                                 .front()
                                 ->secure_payment_confirmation->show_opt_out);
  model_.set_opt_out_label(
      l10n_util::GetStringUTF16(IDS_SECURE_PAYMENT_CONFIRMATION_OPT_OUT_LABEL));
  model_.set_opt_out_link_label(l10n_util::GetStringUTF16(
      IDS_SECURE_PAYMENT_CONFIRMATION_OPT_OUT_LINK_LABEL));

  model_.set_relying_party_id(
      base::UTF8ToUTF16(request_->spec()
                            ->method_data()
                            .front()
                            ->secure_payment_confirmation->rp_id));

  view_ = SecurePaymentConfirmationView::Create(
      request_->state()->GetPaymentRequestDelegate()->GetPaymentUIObserver());
  view_->ShowDialog(
      request_->web_contents(), model_.GetWeakPtr(),
      base::BindOnce(&SecurePaymentConfirmationController::OnConfirm,
                     weak_ptr_factory_.GetWeakPtr()),
      base::BindOnce(&SecurePaymentConfirmationController::OnCancel,
                     weak_ptr_factory_.GetWeakPtr()),
      base::BindOnce(&SecurePaymentConfirmationController::OnOptOut,
                     weak_ptr_factory_.GetWeakPtr()));

  // For automated testing, SPC can be placed in an 'autoaccept' or
  // 'autoreject' mode, where the dialog should immediately be
  // accepted/rejected without user interaction. We deliberately wait until
  // after the dialog is created and shown to handle this, in order to keep the
  // automation codepath as close to the 'real' one as possible.
  if (request_->spc_transaction_mode() != SPCTransactionMode::kNone) {
    // TODO(crbug.com/417426346): Once the desktop SPC controller supports the
    // new fallback flow, it should handle SPCTransactionMode::
    // kAutoAuthAnotherWay here.
    if (request_->spc_transaction_mode() == SPCTransactionMode::kAutoAccept) {
      OnConfirm();
    } else if (request_->spc_transaction_mode() ==
               SPCTransactionMode::kAutoOptOut) {
      OnOptOut();
    } else {
      OnCancel();
    }
  }
}

void SecurePaymentConfirmationController::RetryDialog() {
  // Retry is not supported.
  OnCancel();
}

void SecurePaymentConfirmationController::CloseDialog() {
  if (view_)
    view_->HideDialog();
}

void SecurePaymentConfirmationController::ShowErrorMessage() {
  // Error message is not supported.
  OnCancel();
}

void SecurePaymentConfirmationController::ShowProcessingSpinner() {
  if (!view_)
    return;

  model_.set_progress_bar_visible(true);
  model_.set_verify_button_enabled(false);
  model_.set_cancel_button_enabled(false);
  view_->OnModelUpdated();
}

bool SecurePaymentConfirmationController::IsInteractive() const {
  return view_ && !model_.progress_bar_visible();
}

void SecurePaymentConfirmationController::ShowPaymentHandlerScreen(
    const GURL& url,
    PaymentHandlerOpenWindowCallback callback) {
  // Payment handler screen is not supported.
  NOTREACHED();
}

void SecurePaymentConfirmationController::ConfirmPaymentForTesting() {
  OnConfirm();
}

bool SecurePaymentConfirmationController::ClickOptOutForTesting() {
  // This should only be called when the view is showing.
  DCHECK(view_);
  return view_->ClickOptOutForTesting();
}

void SecurePaymentConfirmationController::OnInitialized(
    InitializationTask* initialization_task) {
  if (--number_of_initialization_tasks_ == 0)
    SetupModelAndShowDialogIfApplicable();
}

void SecurePaymentConfirmationController::OnCancel() {
  base::UmaHistogramEnumeration("SecurePaymentRequest.Transaction.Outcome",
                                SecurePaymentRequestOutcome::kAnotherWay);

  CloseDialog();

  if (!request_)
    return;

  base::SingleThreadTaskRunner::GetCurrentDefault()->PostTask(
      FROM_HERE, base::BindOnce(&PaymentRequest::OnUserCancelled, request_));
}

void SecurePaymentConfirmationController::OnOptOut() {
  base::UmaHistogramEnumeration("SecurePaymentRequest.Transaction.Outcome",
                                SecurePaymentRequestOutcome::kOptOut);

  // Set the opt out clicked state on the model so that the view knows not to
  // call back to OnCancel when the dialog is closed.
  model_.set_opt_out_clicked(true);
  CloseDialog();

  if (!request_)
    return;

  base::SingleThreadTaskRunner::GetCurrentDefault()->PostTask(
      FROM_HERE, base::BindOnce(&PaymentRequest::OnUserOptedOut, request_));
}

void SecurePaymentConfirmationController::OnConfirm() {
  base::UmaHistogramEnumeration("SecurePaymentRequest.Transaction.Outcome",
                                SecurePaymentRequestOutcome::kAccept);

  if (!request_)
    return;

  ShowProcessingSpinner();

  // This will trigger WebAuthn with OS-level UI (if any) on top of the |view_|
  // with its animated processing spinner. For example, on Linux, there's no
  // OS-level UI, while on MacOS, there's an OS-level prompt for the Touch ID
  // that shows on top of Chrome.
  base::SingleThreadTaskRunner::GetCurrentDefault()->PostTask(
      FROM_HERE, base::BindOnce(&PaymentRequest::Pay, request_));
}

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

}  // namespace payments