[Payment Request] Refactors the remaining selector view controllers

ios/chrome/browser/payments/payment_method_selection_mediator.mm

+// 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.
+
+#include <vector>
+
+#import "ios/chrome/browser/payments/payment_method_selection_mediator.h"
+
+#include "base/strings/sys_string_conversions.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/autofill/core/browser/personal_data_manager.h"
+#include "components/strings/grit/components_strings.h"
+#import "ios/chrome/browser/payments/cells/payment_method_item.h"
+#import "ios/chrome/browser/payments/cells/payments_text_item.h"
+#include "ios/chrome/browser/payments/payment_request.h"
+#include "ios/chrome/browser/payments/payment_request_util.h"
+#include "ios/chrome/browser/ui/uikit_ui_util.h"
+#include "ios/chrome/grit/ios_theme_resources.h"
+#include "ui/base/l10n/l10n_util.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+namespace {
+using ::payment_request_util::GetBillingAddressLabelFromAutofillProfile;
+}  // namespace
+
+@interface PaymentMethodSelectionMediator ()
+
+// The PaymentRequest object owning an instance of web::PaymentRequest as
+// provided by the page invoking the Payment Request API. This is a weak
+// pointer and should outlive this class.
+@property(nonatomic, assign) PaymentRequest* paymentRequest;
+
+// The selectable items to display in the collection.
+@property(nonatomic, strong) NSArray<PaymentMethodItem*>* items;
+
+@end
+
+@implementation PaymentMethodSelectionMediator
+
+@synthesize state = _state;
+@synthesize selectedItemIndex = _selectedItemIndex;
+@synthesize paymentRequest = _paymentRequest;
+@synthesize items = _items;
+
+- (instancetype)initWithPaymentRequest:(PaymentRequest*)paymentRequest {
+  self = [super init];
+  if (self) {
+    _paymentRequest = paymentRequest;
+    _selectedItemIndex = NSUIntegerMax;
+    _items = [self createItems];
+  }
+  return self;
+}
+
+#pragma mark - PaymentRequestSelectorViewControllerDataSource
+
+- (CollectionViewItem*)headerItem {
+  return nil;
+}
+
+- (NSArray<CollectionViewItem*>*)selectableItems {
+  return self.items;
+}
+
+- (CollectionViewItem*)selectableItemAtIndex:(NSUInteger)index {
+  DCHECK(index < self.items.count);
+  return [self.items objectAtIndex:index];
+}
+
+- (CollectionViewItem*)addButtonItem {
+  PaymentsTextItem* addButtonItem = [[PaymentsTextItem alloc] init];
+  addButtonItem.text = l10n_util::GetNSString(IDS_PAYMENTS_ADD_CARD);
+  addButtonItem.image = NativeImage(IDR_IOS_PAYMENTS_ADD);
+  return addButtonItem;
+}
+
+#pragma mark - Helper methods
+
+- (NSArray<PaymentMethodItem*>*)createItems {
+  const std::vector<autofill::CreditCard*>& paymentMethods =
+      _paymentRequest->credit_cards();
+  NSMutableArray<PaymentMethodItem*>* items =
+      [NSMutableArray arrayWithCapacity:paymentMethods.size()];
+  for (size_t index = 0; index < paymentMethods.size(); ++index) {
+    autofill::CreditCard* paymentMethod = paymentMethods[index];
+    DCHECK(paymentMethod);
+    PaymentMethodItem* item = [[PaymentMethodItem alloc] init];
+    item.methodID =
+        base::SysUTF16ToNSString(paymentMethod->TypeAndLastFourDigits());
+    item.methodDetail = base::SysUTF16ToNSString(
+        paymentMethod->GetRawInfo(autofill::CREDIT_CARD_NAME_FULL));
+
+    autofill::AutofillProfile* billingAddress =
+        autofill::PersonalDataManager::GetProfileFromProfilesByGUID(
+            paymentMethod->billing_address_id(),
+            _paymentRequest->billing_profiles());
+    if (billingAddress) {
+      item.methodAddress =
+          GetBillingAddressLabelFromAutofillProfile(*billingAddress);
+    }
+
+    int methodTypeIconID =
+        autofill::data_util::GetPaymentRequestData(paymentMethod->type())
+            .icon_resource_id;
+    item.methodTypeIcon = NativeImage(methodTypeIconID);
+
+    item.reserveRoomForAccessoryType = YES;
+    if (_paymentRequest->selected_credit_card() == paymentMethod)
+      _selectedItemIndex = index;
+
+    [items addObject:item];
+  }
+  return items;
+}
+
+@end