Two orders being generated instead of one in Flutter app - flutter

Question

I am trying to make an e-commerce app that allows a user to place an order by either making an online payment using Razorpay or opting for cash on delivery (CoD).
Things work fine for the CoD part, it is in the razorpay powered order that duplicate orders are being created.
My approach: In the checkout screen, I am having two buttons, one each for CoD and online payment using Razorpay. I have a bool isCod initially set to true when the user first navigates to the page. Clicking on either of these buttons sets the isCod variable's values accordingly.
Now, when the user goes ahead with Razorpay payments, once the payment completes successfully two orders are being created at Firestore cloud database (in fact they get created at the same timestamp).
My Code:
class CheckoutScreen extends StatefulWidget {
const CheckoutScreen({super.key, required this.product});
final Map<String, dynamic> product;
#override
State<CheckoutScreen> createState() => _CheckoutScreenState();
}
class _CheckoutScreenState extends State<CheckoutScreen> {
bool isCod = true;
final String? currUserId = FirebaseAuth.instance.currentUser?.uid;
var _razorpay = Razorpay();
int? amount;
final _random = Random();
#override
void initState() {
super.initState();
_razorpay.on(Razorpay.EVENT_PAYMENT_SUCCESS, _handlePaymentSuccess);
_razorpay.on(Razorpay.EVENT_PAYMENT_ERROR, _handlePaymentError);
_razorpay.on(Razorpay.EVENT_EXTERNAL_WALLET, _handleExternalWallet);
generateDropDownValues();
}
void _handlePaymentSuccess(PaymentSuccessResponse response) {
// Do something when payment succeeds
print(response);
//Add current product to Current Orders array
currentOrders.add({
'orderId': Random().nextInt(1000),
'order': [{
'product': widget.product,
'qty': dropDownValue,
}],
'date': DateTime.now(),
'amount': buyNowValue
});
FirebaseFirestore.instance.collection('customers').doc(currUserId).update({
'currentOrders': currentOrders,
});
buyNowValue = 0;
Navigator.pushNamed(context, orderSuccess);
_razorpay.clear();
}
void _handlePaymentError(PaymentFailureResponse response) {
// Do something when payment fails
print("Payment Failed");
}
void _handleExternalWallet(ExternalWalletResponse response) {
// Do something when an external wallet is selected
}
Future<String?> generateRzpOrderId() async {
try {
String basicAuth = 'Basic ${base64Encode(utf8.encode('${razorpayId}:${razorpaySecret}'))}';
Map<String, dynamic> orderData = {
"amount": (buyNowValue*100).toInt(),
"currency": "INR",
'receipt': 'CG_${1000 + _random.nextInt(9999 - 1000)}'
};
var res = await http.post(
Uri.https("api.razorpay.com", "v1/orders"),
headers: <String, String>{
'Authorization': basicAuth,
'Content-Type': 'application/json'
},
body: json.encode(orderData),
);
print(res.body);
if ((json.decode(res.body)).containsKey('error')) {
return null;
} else {
return (json.decode(res.body))['id'];
}
} catch (e) {
print(e);
throw e;
}
}
Future openGateWay() async {
generateRzpOrderId().then((value){
var options = {
'key': 'rzp_live_hUk8LTeESrQ6lL',
'amount': (buyNowValue*100).toInt(), //in the smallest currency sub-unit.
'currency': "INR",
'name': 'Cattle GURU',
'description': 'Online purchase of cattle food',
'order_id': value, // Generate order_id using Orders API
'timeout': 300, // in seconds
'prefill': {
'contact': phoneNumber
}
};
try {
_razorpay.open(options);
} catch (e) {
print(e);
}
});
_razorpay.on(Razorpay.EVENT_PAYMENT_SUCCESS, _handlePaymentSuccess);
_razorpay.on(Razorpay.EVENT_PAYMENT_ERROR, _handlePaymentError);
_razorpay.on(Razorpay.EVENT_EXTERNAL_WALLET, _handleExternalWallet);
}
#override
void dispose() {
_razorpay.clear();
super.dispose(); // Removes all listeners
}
int dropDownValue = 1;
List dropDownValues = [];
generateDropDownValues(){
for(int i = 0; i < buyNowProduct['units']; i++){
dropDownValues.add(i+1);
}
}
#override
Widget build(BuildContext context) {
return Scaffold(
body: SafeArea(
child: Padding(
padding: EdgeInsets.symmetric(horizontal: 0.w),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
SizedBox(height: 2.h,),
Padding(
padding: EdgeInsets.symmetric(horizontal: 5.w),
child: ProductListTile(
onTap: (){
Navigator.push(context, MaterialPageRoute(builder: (context) =>
ProductScreen(
product: widget.product,
isCarted: false,
id: widget.product['prodId'],
prodQty: dropDownValue,
)));
},
imgUrl: widget.product['imgUrls'][0],
productDeliveryDays: widget.product['deliveryDays'],
date: DateTime.now(),
productName: widget.product['name'],
productWeight: widget.product['weight'].toDouble(),
price: widget.product['price'].toDouble(),
mrp: widget.product['mrp'].toDouble(),
protein: widget.product['protein'].toDouble(),
fibre: widget.product['fibre'].toDouble(),
fat: widget.product['fat'].toDouble(),
isCarted: false,
onSubtract: (){},
onAdd: (){},
qty: qty,
width: 0,
height: 0,
onAddToCart: (){},
onBuyNow: (){},
),
),
// SizedBox(height: 1.h,),
Padding(
padding: EdgeInsets.symmetric(horizontal: 5.w),
child: Row(
children: [
Text(isEnglish ? "Select quantity" : "संख्या चुनें", style: globalTextStyle.copyWith(color: black, fontSize: 4.w, fontWeight: FontWeight.bold),),
SizedBox(width: 2.5.w,),
DropdownButton(
value: dropDownValue,
style: globalTextStyle.copyWith(color: grey, fontWeight: FontWeight.bold),
iconEnabledColor: grey,
items: dropDownValues.map((items) => DropdownMenuItem(value: items, child: Text(items.toString()))).toList(),
onChanged: (newValue){
setState(() {
dropDownValue = newValue as int;
buyNowValue = dropDownValue*auxBuyNowValue;
});
},
)
// CustomDropDown(items: dropDownValues, dropdownvalue: dropDownValue)
],
),
),
SizedBox(height: 1.h,),
Padding(
padding: EdgeInsets.symmetric(horizontal: 5.w),
child: Text(isEnglish ? "Deliver to" : "इस पते पर पहुंचाएं", style: globalTextStyle.copyWith(color: black, fontSize: 4.w, fontWeight: FontWeight.bold),),
),
SizedBox(height: 1.h,),
AddressCard(
onTap: (){},
isDefault: false,
name: firestoreCurrentAddress['name'],
address: "${firestoreCurrentAddress['houseNum']}, ${firestoreCurrentAddress['village']}, ${firestoreCurrentAddress['district']}, ${firestoreCurrentAddress['state']}, ${firestoreCurrentAddress['pinCode']}",
onEditTap: (){
// Navigator.push(context, MaterialPageRoute(builder: (context) => EditAddressScreen(address: addressTiles[1], addressIndex: 1, isDefault: false,)));
Navigator.pushNamed(context, myAddresses);
},
onDefaultTap: (){
},
onRemoveTap: (){},
),
SizedBox(height: 1.h,),
Padding(
padding: EdgeInsets.symmetric(horizontal: 5.w),
child: Row(
children: [
InkWell(
onTap: (){
setState(() {
isCod= true;
});
},
child: Container(
width: 44.w,
height: 15.w,
decoration: BoxDecoration(
border: Border.all(color: primary),
borderRadius: BorderRadius.all(Radius.circular(2.w)),
color: isCod ? primary : primaryLight,
),
child: Center(
child: Text(isEnglish ? "Cash on Delivery (COD)" : "डिलवरी पर नकदी", style: globalTextStyle.copyWith(color: isCod ? white : black, fontSize: 3.5.w, fontWeight: FontWeight.bold),),
),
),
),
SizedBox(width: 2.w,),
InkWell(
onTap: (){
setState(() {
isCod = false;
});
},
child: Container(
width: 44.w,
height: 15.w,
decoration: BoxDecoration(
border: Border.all(color: primary),
borderRadius: BorderRadius.all(Radius.circular(2.w)),
color: isCod ? primaryLight : primary,
),
child: Center(
child: Text(isEnglish ? "Online Payment" : "ऑनलाइन भुगतान", style: globalTextStyle.copyWith(color: isCod ? black : white, fontSize: 3.5.w, fontWeight: FontWeight.bold),),
),
),
),
],
),
),
SizedBox(height: 1.h,),
Padding(
padding: EdgeInsets.symmetric(horizontal: 5.w),
child: CustomButton(width: 90.w, height: 15.w, color: primary,
onTap: () async {
if(isCod == false) {
await openGateWay();
} else {
//Add current product to Current Orders array
currentOrders.add({
'orderId': Random().nextInt(1000),
'order': [{
'product': widget.product,
'qty': dropDownValue,
}],
'date': DateTime.now(),
'amount': buyNowValue
});
FirebaseFirestore.instance.collection('customers').doc(currUserId).update({
'currentOrders': currentOrders,
});
buyNowValue = 0;
Navigator.pushNamed(context, orderSuccess);
}
},
text: isEnglish ? "Pay ${buyNowValue.toCurrencyString(leadingSymbol: "₹", useSymbolPadding: true)}" : "${buyNowValue.toCurrencyString(leadingSymbol: "₹", useSymbolPadding: true)} भुगतान करें ", fontColor: white, borderColor: primary),
)
],
),
),
),
);
}
}
I would like to know what is wrong in my code that results in the duplicate order being created and how this issue can be solved.