[Payments] Refactor into PaymentRequestState and Spec

components/payments/content/payment_request_state.cc

Index: components/payments/content/payment_request_state.cc
diff --git a/components/payments/content/payment_request_state.cc b/components/payments/content/payment_request_state.cc
new file mode 100644
index 0000000000000000000000000000000000000000..32043f7ae4eb87da066912a92470a91a0f0b07a5
--- /dev/null
+++ b/components/payments/content/payment_request_state.cc
@@ -0,0 +1,172 @@
+// Copyright 2016 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/payments/content/payment_request_state.h"
+
+#include "components/autofill/core/browser/autofill_data_util.h"
+#include "components/autofill/core/browser/autofill_profile.h"
+#include "components/autofill/core/browser/credit_card.h"
+#include "components/payments/content/payment_request_spec.h"
+#include "components/payments/core/autofill_payment_instrument.h"
+
+namespace payments {
+
+namespace {
+// Identifier for the basic card payment method in the PaymentMethodData.
+static const char* const kBasicCardMethodName = "basic-card";
+}  // namespace
+
+PaymentRequestState::PaymentRequestState(PaymentRequestSpec* spec,
+                                         Delegate* delegate)
+    : is_ready_to_pay_(false),
+      spec_(spec),
+      delegate_(delegate),
+      selected_shipping_profile_(nullptr),
+      selected_contact_profile_(nullptr),
+      selected_credit_card_(nullptr),
+      selected_shipping_option_(nullptr) {
+  UpdateSelectedShippingOption();
+}
+
+void PaymentRequestState::AddObserver(Observer* observer) {
+  CHECK(observer);
+  observers_.AddObserver(observer);
+}
+PaymentRequestState::~PaymentRequestState() {}
+
+void PaymentRequestState::RemoveObserver(Observer* observer) {
+  observers_.RemoveObserver(observer);
+}
+
+void PaymentRequestState::OnInstrumentDetailsReady(
+    const std::string& method_name,
+    const std::string& stringified_details) {
+  // TODO(mathp): Fill other fields in the PaymentResponsePtr object.
+  mojom::PaymentResponsePtr payment_response = mojom::PaymentResponse::New();
+
+  payment_response->method_name = method_name;
+  payment_response->stringified_details = stringified_details;
+  delegate_->OnPaymentResponseAvailable(std::move(payment_response));
+}
+
+void PaymentRequestState::GeneratePaymentResponse() {
+  // TODO(mathp): PaymentRequest should know about the currently selected
+  // instrument, and not |selected_credit_card_| which is too specific.
+  // TODO(mathp): The method_name should reflect what the merchant asked, and
+  // not necessarily basic-card.
+  selected_payment_instrument_.reset(new AutofillPaymentInstrument(
+      kBasicCardMethodName, *selected_credit_card_,
+      delegate_->GetBillingProfiles(), delegate_->GetApplicationLocale()));
+  // Fetch the instrument details, will call back into
+  // PaymentRequest::OnInstrumentsDetailsReady.
+  selected_payment_instrument_->InvokePaymentApp(this);
+}
+
+void PaymentRequestState::SetSelectedShippingProfile(
+    autofill::AutofillProfile* profile) {
+  selected_shipping_profile_ = profile;
+  UpdateIsReadyToPayAndNotifyObservers();
+}
+
+void PaymentRequestState::SetSelectedContactProfile(
+    autofill::AutofillProfile* profile) {
+  selected_contact_profile_ = profile;
+  UpdateIsReadyToPayAndNotifyObservers();
+}
+
+void PaymentRequestState::SetSelectedCreditCard(autofill::CreditCard* card) {
+  selected_credit_card_ = card;
+  UpdateIsReadyToPayAndNotifyObservers();
+}
+
+void PaymentRequestState::SetInitialSelections(
+    autofill::AutofillProfile* shipping,
+    autofill::AutofillProfile* contact,
+    autofill::CreditCard* card) {
+  // Setting directly instead of using their setters to avoid recomputing the
+  // "ready to pay" state.
+  selected_shipping_profile_ = shipping;
+  selected_contact_profile_ = contact;
+  selected_credit_card_ = card;
+  UpdateIsReadyToPayAndNotifyObservers();
+}
+
+void PaymentRequestState::UpdateIsReadyToPayAndNotifyObservers() {
+  is_ready_to_pay_ =
+      ArePaymentDetailsSatisfied() && ArePaymentOptionsSatisfied();
+  NotifyOnSelectedInformationChanged();
+}
+
+void PaymentRequestState::NotifyOnSelectedInformationChanged() {
+  for (auto& observer : observers_)
+    observer.OnSelectedInformationChanged();
+}
+
+bool PaymentRequestState::ArePaymentDetailsSatisfied() {
+  // TODO(mathp): A masked card may not satisfy IsValid().
+  if (selected_credit_card_ == nullptr || !selected_credit_card_->IsValid())
+    return false;
+
+  const std::string basic_card_payment_type =
+      autofill::data_util::GetPaymentRequestData(selected_credit_card_->type())
+          .basic_card_payment_type;
+  return !spec_->supported_card_networks().empty() &&
+         std::find(spec_->supported_card_networks().begin(),
+                   spec_->supported_card_networks().end(),
+                   basic_card_payment_type) !=
+             spec_->supported_card_networks().end();
+}
+
+bool PaymentRequestState::ArePaymentOptionsSatisfied() {
+  // TODO(mathp): Have a measure of shipping address completeness.
+  if (spec_->request_shipping() && selected_shipping_profile_ == nullptr)
+    return false;
+
+  // TODO(mathp): Make an encompassing class to validate contact info.
+  const std::string& app_locale = delegate_->GetApplicationLocale();
+  if (spec_->request_payer_name() &&
+      (selected_contact_profile_ == nullptr ||
+       selected_contact_profile_
+           ->GetInfo(autofill::AutofillType(autofill::NAME_FULL), app_locale)
+           .empty())) {
+    return false;
+  }
+  if (spec_->request_payer_email() &&
+      (selected_contact_profile_ == nullptr ||
+       selected_contact_profile_
+           ->GetInfo(autofill::AutofillType(autofill::EMAIL_ADDRESS),
+                     app_locale)
+           .empty())) {
+    return false;
+  }
+  if (spec_->request_payer_phone() &&
+      (selected_contact_profile_ == nullptr ||
+       selected_contact_profile_
+           ->GetInfo(autofill::AutofillType(autofill::PHONE_HOME_WHOLE_NUMBER),
+                     app_locale)
+           .empty())) {
+    return false;
+  }
+
+  return true;
+}
+
+void PaymentRequestState::UpdateSelectedShippingOption() {
+  selected_shipping_option_ = nullptr;
+
+  // As per the spec, the selected shipping option should initially be the last
+  // one in the array that has its selected field set to true.
+  auto selected_shipping_option_it = std::find_if(
+      spec_->details()->shipping_options.rbegin(),
+      spec_->details()->shipping_options.rend(),
+      [](const payments::mojom::PaymentShippingOptionPtr& element) {
+        return element->selected;
+      });
+  if (selected_shipping_option_it !=
+      spec_->details()->shipping_options.rend()) {
+    selected_shipping_option_ = selected_shipping_option_it->get();
+  }
+}
+
+}  // namespace payments