[Payment Request] Refactors the remaining selector view controllers

ios/chrome/browser/payments/payment_method_selection_view_controller.mm

-// 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.
-
-#import "ios/chrome/browser/payments/payment_method_selection_view_controller.h"
-
-#include "base/mac/foundation_util.h"
-#include "base/strings/sys_string_conversions.h"
-#include "components/autofill/core/browser/autofill_data_util.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"
-#import "ios/chrome/browser/payments/payment_method_selection_view_controller_actions.h"
-#include "ios/chrome/browser/payments/payment_request.h"
-#include "ios/chrome/browser/payments/payment_request_util.h"
-#import "ios/chrome/browser/ui/collection_view/cells/MDCCollectionViewCell+Chrome.h"
-#import "ios/chrome/browser/ui/collection_view/cells/collection_view_detail_item.h"
-#import "ios/chrome/browser/ui/collection_view/cells/collection_view_item.h"
-#import "ios/chrome/browser/ui/collection_view/collection_view_model.h"
-#import "ios/chrome/browser/ui/colors/MDCPalette+CrAdditions.h"
-#import "ios/chrome/browser/ui/icons/chrome_icon.h"
-#include "ios/chrome/browser/ui/uikit_ui_util.h"
-#include "ios/chrome/grit/ios_strings.h"
-#include "ios/chrome/grit/ios_theme_resources.h"
-#include "ios/web/public/payments/payment_request.h"
-#include "ui/base/l10n/l10n_util.h"
-#include "ui/base/resource/resource_bundle.h"
-
-#if !defined(__has_feature) || !__has_feature(objc_arc)
-#error "This file requires ARC support."
-#endif
-
-NSString* const kPaymentMethodSelectionCollectionViewID =
-    @"kPaymentMethodSelectionCollectionViewID";
-
-namespace {
-using ::payment_request_util::GetBillingAddressLabelFromAutofillProfile;
-
-const CGFloat kSeparatorEdgeInset = 14;
-
-typedef NS_ENUM(NSInteger, SectionIdentifier) {
-  SectionIdentifierPayment = kSectionIdentifierEnumZero,
-};
-
-typedef NS_ENUM(NSInteger, ItemType) {
-  ItemTypePaymentMethod = kItemTypeEnumZero,  // This is a repeated item type.
-  ItemTypeAddMethod,
-};
-
-}  // namespace
-
-@interface PaymentMethodSelectionViewController ()<
-    PaymentMethodSelectionViewControllerActions> {
-  // The PaymentRequest object having a copy of web::PaymentRequest as provided
-  // by the page invoking the Payment Request API. This is a weak pointer and
-  // should outlive this class.
-  PaymentRequest* _paymentRequest;
-
-  // The currently selected item. May be nil.
-  __weak PaymentMethodItem* _selectedItem;
-}
-
-@end
-
-@implementation PaymentMethodSelectionViewController
-@synthesize delegate = _delegate;
-
-- (instancetype)initWithPaymentRequest:(PaymentRequest*)paymentRequest {
-  DCHECK(paymentRequest);
-  if ((self = [super initWithStyle:CollectionViewControllerStyleAppBar])) {
-    [self
-        setTitle:l10n_util::GetNSString(IDS_PAYMENTS_METHOD_OF_PAYMENT_LABEL)];
-
-    // Set up leading (return) button.
-    UIBarButtonItem* returnButton =
-        [ChromeIcon templateBarButtonItemWithImage:[ChromeIcon backIcon]
-                                            target:nil
-                                            action:@selector(onReturn)];
-    returnButton.accessibilityLabel = l10n_util::GetNSString(IDS_ACCNAME_BACK);
-    [self navigationItem].leftBarButtonItem = returnButton;
-
-    _paymentRequest = paymentRequest;
-  }
-  return self;
-}
-
-- (void)onReturn {
-  [_delegate paymentMethodSelectionViewControllerDidReturn:self];
-}
-
-#pragma mark - CollectionViewController methods
-
-- (void)loadModel {
-  [super loadModel];
-  CollectionViewModel* model = self.collectionViewModel;
-  _selectedItem = nil;
-
-  [model addSectionWithIdentifier:SectionIdentifierPayment];
-
-  for (const auto* paymentMethod : _paymentRequest->credit_cards()) {
-    PaymentMethodItem* paymentMethodItem =
-        [[PaymentMethodItem alloc] initWithType:ItemTypePaymentMethod];
-
-    paymentMethodItem.accessibilityTraits |= UIAccessibilityTraitButton;
-    paymentMethodItem.methodID =
-        base::SysUTF16ToNSString(paymentMethod->TypeAndLastFourDigits());
-    paymentMethodItem.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) {
-      paymentMethodItem.methodAddress =
-          GetBillingAddressLabelFromAutofillProfile(*billingAddress);
-    }
-
-    int methodTypeIconID =
-        autofill::data_util::GetPaymentRequestData(paymentMethod->type())
-            .icon_resource_id;
-    paymentMethodItem.methodTypeIcon = NativeImage(methodTypeIconID);
-
-    paymentMethodItem.reserveRoomForAccessoryType = YES;
-
-    if (_paymentRequest->selected_credit_card() == paymentMethod) {
-      paymentMethodItem.accessoryType = MDCCollectionViewCellAccessoryCheckmark;
-      _selectedItem = paymentMethodItem;
-    }
-    [model addItem:paymentMethodItem
-        toSectionWithIdentifier:SectionIdentifierPayment];
-  }
-
-  PaymentsTextItem* addPaymentMethod =
-      [[PaymentsTextItem alloc] initWithType:ItemTypeAddMethod];
-  addPaymentMethod.text = l10n_util::GetNSString(IDS_PAYMENTS_ADD_CARD);
-  addPaymentMethod.image = NativeImage(IDR_IOS_PAYMENTS_ADD);
-  addPaymentMethod.accessibilityTraits |= UIAccessibilityTraitButton;
-  [model addItem:addPaymentMethod
-      toSectionWithIdentifier:SectionIdentifierPayment];
-}
-
-- (void)viewDidLoad {
-  [super viewDidLoad];
-  self.collectionView.accessibilityIdentifier =
-      kPaymentMethodSelectionCollectionViewID;
-
-  // Customize collection view settings.
-  self.styler.cellStyle = MDCCollectionViewCellStyleCard;
-  self.styler.separatorInset =
-      UIEdgeInsetsMake(0, kSeparatorEdgeInset, 0, kSeparatorEdgeInset);
-}
-
-#pragma mark UICollectionViewDelegate
-
-- (void)collectionView:(UICollectionView*)collectionView
-    didSelectItemAtIndexPath:(NSIndexPath*)indexPath {
-  [super collectionView:collectionView didSelectItemAtIndexPath:indexPath];
-
-  CollectionViewModel* model = self.collectionViewModel;
-
-  CollectionViewItem* item = [model itemAtIndexPath:indexPath];
-  if (item.type == ItemTypePaymentMethod) {
-    // Update the currently selected cell, if any.
-    if (_selectedItem) {
-      _selectedItem.accessoryType = MDCCollectionViewCellAccessoryNone;
-      [self reconfigureCellsForItems:@[ _selectedItem ]
-             inSectionWithIdentifier:SectionIdentifierPayment];
-    }
-
-    // Update the newly selected cell.
-    PaymentMethodItem* newlySelectedItem =
-        base::mac::ObjCCastStrict<PaymentMethodItem>(item);
-    newlySelectedItem.accessoryType = MDCCollectionViewCellAccessoryCheckmark;
-    [self reconfigureCellsForItems:@[ newlySelectedItem ]
-           inSectionWithIdentifier:SectionIdentifierPayment];
-
-    // Update the reference to the selected item.
-    _selectedItem = newlySelectedItem;
-
-    // Notify the delegate of the selection.
-    NSInteger index = [model indexInItemTypeForIndexPath:indexPath];
-    DCHECK(index < (NSInteger)_paymentRequest->credit_cards().size());
-    [_delegate
-        paymentMethodSelectionViewController:self
-                      didSelectPaymentMethod:_paymentRequest
-                                                 ->credit_cards()[index]];
-  } else if (item.type == ItemTypeAddMethod) {
-    [_delegate paymentMethodSelectionViewControllerDidSelectAddCard:self];
-  }
-}
-
-#pragma mark MDCCollectionViewStylingDelegate
-
-- (CGFloat)collectionView:(UICollectionView*)collectionView
-    cellHeightAtIndexPath:(NSIndexPath*)indexPath {
-  CollectionViewItem* item =
-      [self.collectionViewModel itemAtIndexPath:indexPath];
-  switch (item.type) {
-    case ItemTypePaymentMethod:
-    case ItemTypeAddMethod:
-      return [MDCCollectionViewCell
-          cr_preferredHeightForWidth:CGRectGetWidth(collectionView.bounds)
-                             forItem:item];
-    default:
-      NOTREACHED();
-      return MDCCellDefaultOneLineHeight;
-  }
-}
-
-@end