Checks for credit cards duplication.

1)Checks if there is any saved credit card with the same number.
2)If there is any, then update saved credit card object with the new data
update it in DB by PersonalDataManager.
3)Adds method for updating credit card properties.

Change-Id: Ife5efb47a0bee6439ae05981116bc891b7289f7e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1731839
Commit-Queue: Reda Tawfik <redatawfik@google.com>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Reviewed-by: Javier Ernesto Flores Robles <javierrobles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#684432}

ios/chrome/browser/ui/settings/autofill/autofill_add_credit_card_mediator.mm

@@ -51,24 +51,13 @@
                     expirationMonth:(NSString*)expirationMonth
                      expirationYear:(NSString*)expirationYear {
   autofill::CreditCard creditCard = autofill::CreditCard();
+  [self updateCreditCard:&creditCard
+          cardHolderName:cardHolderName
+              cardNumber:cardNumber
+         expirationMonth:expirationMonth
+          expirationYear:expirationYear];
 
-  const std::string& appLocal = GetApplicationContext()->GetApplicationLocale();
-  creditCard.SetInfo(autofill::AutofillType(AutofillTypeFromAutofillUIType(
-                         AutofillUITypeCreditCardHolderFullName)),
-                     base::SysNSStringToUTF16(cardHolderName), appLocal);
-
-  creditCard.SetInfo(autofill::AutofillType(AutofillTypeFromAutofillUIType(
-                         AutofillUITypeCreditCardNumber)),
-                     base::SysNSStringToUTF16(cardNumber), appLocal);
-
-  creditCard.SetInfo(autofill::AutofillType(AutofillTypeFromAutofillUIType(
-                         AutofillUITypeCreditCardExpMonth)),
-                     base::SysNSStringToUTF16(expirationMonth), appLocal);
-
-  creditCard.SetInfo(autofill::AutofillType(AutofillTypeFromAutofillUIType(
-                         AutofillUITypeCreditCardExpYear)),
-                     base::SysNSStringToUTF16(expirationYear), appLocal);
-
+  // Validates the credit card number and expiration date.
   if (!creditCard.HasValidCardNumber()) {
     [self.addCreditCardMediatorDelegate
         creditCardMediatorHasInvalidCardNumber:self];
@@ -81,7 +70,27 @@
     return;
   }
 
-  self.personalDataManager->AddCreditCard(creditCard);
+  autofill::CreditCard* savedCreditCard =
+      self.personalDataManager->GetCreditCardByNumber(
+          base::SysNSStringToUTF8(cardNumber));
+
+  // If the credit card number already exist in saved credit card
+  // |savedCreditCard| then update saved credit card |savedCreditCardCopy|
+  // with the new data.
+  if (savedCreditCard != nil) {
+    autofill::CreditCard savedCreditCardCopy(*savedCreditCard);
+
+    [self updateCreditCard:&savedCreditCardCopy
+            cardHolderName:cardHolderName
+                cardNumber:cardNumber
+           expirationMonth:expirationMonth
+            expirationYear:expirationYear];
+
+    self.personalDataManager->UpdateCreditCard(savedCreditCardCopy);
+  } else {
+    self.personalDataManager->AddCreditCard(creditCard);
+  }
+
   [self.addCreditCardMediatorDelegate creditCardMediatorDidFinish:self];
 }
 
@@ -89,4 +98,41 @@
   [self.addCreditCardMediatorDelegate creditCardMediatorDidFinish:self];
 }
 
+#pragma mark - Private
+
+// Updates received credit card with received data.
+- (void)updateCreditCard:(autofill::CreditCard*)creditCard
+          cardHolderName:(NSString*)cardHolderName
+              cardNumber:(NSString*)cardNumber
+         expirationMonth:(NSString*)expirationMonth
+          expirationYear:(NSString*)expirationYear {
+  [self updateCreditCard:creditCard
+            cardProperty:cardHolderName
+          autofillUIType:AutofillUITypeCreditCardHolderFullName];
+
+  [self updateCreditCard:creditCard
+            cardProperty:cardNumber
+          autofillUIType:AutofillUITypeCreditCardNumber];
+
+  [self updateCreditCard:creditCard
+            cardProperty:expirationMonth
+          autofillUIType:AutofillUITypeCreditCardExpMonth];
+
+  [self updateCreditCard:creditCard
+            cardProperty:expirationYear
+          autofillUIType:AutofillUITypeCreditCardExpYear];
+}
+
+// Updates the |AutofillUIType| of the |creditCard| with the value of
+// |cardProperty|.
+- (void)updateCreditCard:(autofill::CreditCard*)creditCard
+            cardProperty:(NSString*)cardValue
+          autofillUIType:(AutofillUIType)fieldType {
+  const std::string& appLocal = GetApplicationContext()->GetApplicationLocale();
+
+  creditCard->SetInfo(
+      autofill::AutofillType(AutofillTypeFromAutofillUIType(fieldType)),
+      base::SysNSStringToUTF16(cardValue), appLocal);
+}
+
 @end