[Payments] Refactor into PaymentRequestState and Spec

components/payments/content/payment_request_state.h

Index: components/payments/content/payment_request_state.h
diff --git a/components/payments/content/payment_request_state.h b/components/payments/content/payment_request_state.h
new file mode 100644
index 0000000000000000000000000000000000000000..536ec8d523a450d6ce067a1e03d0e55a7b5b96e1
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+++ b/components/payments/content/payment_request_state.h
@@ -0,0 +1,170 @@
+// Copyright 2017 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.
+
+#ifndef COMPONENTS_PAYMENTS_CONTENT_PAYMENT_REQUEST_STATE_H_
+#define COMPONENTS_PAYMENTS_CONTENT_PAYMENT_REQUEST_STATE_H_
+
+#include "base/macros.h"
+#include "base/observer_list.h"
+#include "components/autofill/core/browser/personal_data_manager.h"
+#include "components/payments/content/payment_request.mojom.h"
+#include "components/payments/core/payment_instrument.h"
+
+namespace autofill {
+class AutofillProfile;
+class CreditCard;
+}  // namespace autofill
+
+namespace payments {
+
+class PaymentRequestSpec;
+
+// Keeps track of the information currently selected by the user and whether the
+// user is ready to pay. Uses information from the PaymentRequestSpec, which is
+// what the merchant has specified, as input into the "is ready to pay"
+// computation.
+class PaymentRequestState : public PaymentInstrument::Delegate {
+ public:
+  // Any class call add itself as Observer via AddObserver() and receive
+  // notification about the state changing.
+  class Observer {
+   public:
+    // Called when the information (payment method, address/contact info,
+    // shipping option) changes.
+    virtual void OnSelectedInformationChanged() = 0;
+
+   protected:
+    virtual ~Observer() {}
+  };
+
+  class Delegate {
+   public:
+    virtual const std::string& GetApplicationLocale() = 0;
+    // Used to get the user's data.
+    virtual autofill::PersonalDataManager* GetPersonalDataManager() = 0;
+    // Called when the PaymentResponse is available.
+    virtual void OnPaymentResponseAvailable(
+        mojom::PaymentResponsePtr response) = 0;
+
+   protected:
+    virtual ~Delegate() {}
+  };
+
+  PaymentRequestState(PaymentRequestSpec* spec, Delegate* delegate);
+  ~PaymentRequestState() override;
+
+  void AddObserver(Observer* observer);
+  void RemoveObserver(Observer* observer);
+
+  // PaymentInstrument::Delegate:
+  void OnInstrumentDetailsReady(
+      const std::string& method_name,
+      const std::string& stringified_details) override;
+  void OnInstrumentDetailsError() override {}
+
+  // Initiates the generation of the PaymentResponse. Callers should check
+  // |is_ready_to_pay|, which is inexpensive.
+  void GeneratePaymentResponse();
+
+  // Gets the Autofill Profile representing the shipping address or contact
+  // information currently selected for this PaymentRequest flow. Can return
+  // null.
+  autofill::AutofillProfile* selected_shipping_profile() const {
+    return selected_shipping_profile_;
+  }
+  autofill::AutofillProfile* selected_contact_profile() const {
+    return selected_contact_profile_;
+  }
+  // Returns the currently selected credit card for this PaymentRequest flow.
+  // It's not guaranteed to be complete. Returns nullptr if there is no selected
+  // card.
+  autofill::CreditCard* selected_credit_card() const {
+    return selected_credit_card_;
+  }
+  mojom::PaymentShippingOption* selected_shipping_option() {
+    return selected_shipping_option_;
+  }
+
+  // Returns the appropriate Autofill Profiles for this user. The profiles
+  // returned are owned by the PaymentRequestState.
+  const std::vector<autofill::AutofillProfile*>& shipping_profiles() {
+    return shipping_profiles_;
+  }
+  const std::vector<autofill::AutofillProfile*>& contact_profiles() {
+    return contact_profiles_;
+  }
+  const std::vector<autofill::CreditCard*>& credit_cards() {
+    return credit_cards_;
+  }
+
+  // Setters to change the selected information. Will have the side effect of
+  // recomputing "is ready to pay" and notify observers.
+  void SetSelectedShippingProfile(autofill::AutofillProfile* profile);
+  void SetSelectedContactProfile(autofill::AutofillProfile* profile);
+  void SetSelectedCreditCard(autofill::CreditCard* card);
+
+  bool is_ready_to_pay() { return is_ready_to_pay_; }
+
+ private:
+  // Fetches the Autofill Profiles for this user from the PersonalDataManager,
+  // and stores copies of them, owned by this PaymentRequestState, in
+  // profile_cache_.
+  void PopulateProfileCache();
+
+  // Sets the initial selections for credit card and profiles, and notifies
+  // observers.
+  void SetDefaultProfileSelections();
+
+  // Uses the user-selected information as well as the merchant spec to update
+  // |is_ready_to_pay_| with the current state, by validating that all the
+  // required information is available. Will notify observers.
+  void UpdateIsReadyToPayAndNotifyObservers();
+
+  // Notifies all observers that selected information has changed.
+  void NotifyOnSelectedInformationChanged();
+
+  // Returns whether the selected data satisfies the PaymentDetails requirements
+  // (payment methods).
+  bool ArePaymentDetailsSatisfied();
+  // Returns whether the selected data satisfies the PaymentOptions requirements
+  // (contact info, shipping address).
+  bool ArePaymentOptionsSatisfied();
+
+  // Updates the selected_shipping_option based on the data passed to this
+  // payment request by the website. This will set selected_shipping_option_ to
+  // the last option marked selected in the options array.
+  void UpdateSelectedShippingOption();
+
+  bool is_ready_to_pay_;
+
+  // Not owned. Never null. Both outlive this object.
+  PaymentRequestSpec* spec_;
+  Delegate* delegate_;
+
+  autofill::AutofillProfile* selected_shipping_profile_;
+  autofill::AutofillProfile* selected_contact_profile_;
+  autofill::CreditCard* selected_credit_card_;
+  // The shipping options (and thus this pointer) are owned by |spec_| which
+  // outlives this object.
+  mojom::PaymentShippingOption* selected_shipping_option_;
+
+  std::unique_ptr<PaymentInstrument> selected_payment_instrument_;
+
+  // Profiles may change due to (e.g.) sync events, so profiles are cached after
+  // loading and owned here. They are populated once only, and ordered by
+  // frecency.
+  std::vector<std::unique_ptr<autofill::AutofillProfile>> profile_cache_;
+  std::vector<autofill::AutofillProfile*> shipping_profiles_;
+  std::vector<autofill::AutofillProfile*> contact_profiles_;
+  std::vector<std::unique_ptr<autofill::CreditCard>> card_cache_;
+  std::vector<autofill::CreditCard*> credit_cards_;
+
+  base::ObserverList<Observer> observers_;
+
+  DISALLOW_COPY_AND_ASSIGN(PaymentRequestState);
+};
+
+}  // namespace payments
+
+#endif  // COMPONENTS_PAYMENTS_CONTENT_PAYMENT_REQUEST_STATE_H_