added otp resend cooldown

lib/screens/onboarding/verify/verify_screen.dart

@@ -1,3 +1,5 @@
+import 'dart:async';
+
 import 'package:flutter/material.dart';
 import 'package:go_router/go_router.dart';
 import 'package:qpay/screens/onboarding/verify/verify_controller.dart';
@@ -14,11 +16,19 @@ class VerifyScreen extends StatefulWidget {
 class _VerifyScreenState extends State<VerifyScreen> {
   late VerifyController verifyController;
   String? errorMessage;
+  // Resend cooldown
+  final Duration _resendCooldown = const Duration(minutes: 1);
+  DateTime? _resendAvailableAt;
+  Timer? _resendTimer;
+  int _remainingSeconds = 0;
 
   @override
   void initState() {
     super.initState();
     verifyController = VerifyController(context);
+    // Start the resend cooldown immediately since the OTP was just sent
+    // during registration.
+    _startResendCooldown();
   }
 
   final List<TextEditingController> _codeControllers = List.generate(
@@ -35,9 +45,43 @@ class _VerifyScreenState extends State<VerifyScreen> {
     for (var node in _focusNodes) {
       node.dispose();
     }
+    _resendTimer?.cancel();
     super.dispose();
   }
 
+  void _startResendCooldown() {
+    _resendTimer?.cancel();
+    _resendAvailableAt = DateTime.now().add(_resendCooldown);
+    _remainingSeconds = _resendCooldown.inSeconds;
+    if (mounted) setState(() {});
+    _resendTimer = Timer.periodic(
+      const Duration(seconds: 1),
+      (_) => _updateRemaining(),
+    );
+  }
+
+  void _updateRemaining() {
+    if (_resendAvailableAt == null) return;
+    final seconds = _resendAvailableAt!.difference(DateTime.now()).inSeconds;
+    if (seconds <= 0) {
+      _resendTimer?.cancel();
+      setState(() {
+        _resendAvailableAt = null;
+        _remainingSeconds = 0;
+      });
+    } else {
+      setState(() {
+        _remainingSeconds = seconds;
+      });
+    }
+  }
+
+  String _formatDuration(int totalSeconds) {
+    final mins = (totalSeconds ~/ 60).toString().padLeft(2, '0');
+    final secs = (totalSeconds % 60).toString().padLeft(2, '0');
+    return '$mins:$secs';
+  }
+
   void showErrorMessage(String? message) {
     setState(() {
       errorMessage = message;
@@ -172,10 +216,7 @@ class _VerifyScreenState extends State<VerifyScreen> {
               ),
               focusedBorder: OutlineInputBorder(
                 borderRadius: borderRadius,
-                borderSide: BorderSide(
-                  color: colorScheme.primary,
-                  width: 1.6,
-                ),
+                borderSide: BorderSide(color: colorScheme.primary, width: 1.6),
               ),
               errorBorder: OutlineInputBorder(
                 borderRadius: borderRadius,
@@ -183,10 +224,7 @@ class _VerifyScreenState extends State<VerifyScreen> {
               ),
               focusedErrorBorder: OutlineInputBorder(
                 borderRadius: borderRadius,
-                borderSide: BorderSide(
-                  color: colorScheme.error,
-                  width: 1.6,
-                ),
+                borderSide: BorderSide(color: colorScheme.error, width: 1.6),
               ),
             ),
             onChanged: (value) => _onCodeChanged(value, index),
@@ -209,20 +247,49 @@ class _VerifyScreenState extends State<VerifyScreen> {
               fontSize: 14,
             ),
           ),
-          TextButton(
-            onPressed: () {
-              verifyController.resendOtp();
-            },
-            style: TextButton.styleFrom(
-              foregroundColor: colorScheme.primary,
-              padding: const EdgeInsets.symmetric(horizontal: 6),
-              textStyle: const TextStyle(
-                fontSize: 14,
-                fontWeight: FontWeight.w700,
-              ),
-            ),
-            child: const Text('Resend code'),
-          ),
+          // Show countdown while cooling down, otherwise show resend button
+          _remainingSeconds == 0
+              ? TextButton(
+                  onPressed: verifyController.model.isLoading
+                      ? null
+                      : () async {
+                          // Start cooldown immediately to give immediate feedback
+                          _startResendCooldown();
+                          final resp = await verifyController.resendOtp();
+                          if (!mounted) return;
+                          if (!resp.isSuccess) {
+                            // cancel cooldown on failure and show error
+                            _resendTimer?.cancel();
+                            setState(() {
+                              _resendAvailableAt = null;
+                              _remainingSeconds = 0;
+                            });
+                            showErrorMessage(
+                              resp.error ?? 'Failed to resend code',
+                            );
+                          }
+                        },
+                  style: TextButton.styleFrom(
+                    foregroundColor: colorScheme.primary,
+                    padding: const EdgeInsets.symmetric(horizontal: 6),
+                    textStyle: const TextStyle(
+                      fontSize: 14,
+                      fontWeight: FontWeight.w700,
+                    ),
+                  ),
+                  child: const Text('Resend code'),
+                )
+              : Padding(
+                  padding: const EdgeInsets.symmetric(horizontal: 6),
+                  child: Text(
+                    'Resend in ${_formatDuration(_remainingSeconds)}',
+                    style: TextStyle(
+                      color: colorScheme.onSurface.withValues(alpha: 0.65),
+                      fontSize: 14,
+                      fontWeight: FontWeight.w700,
+                    ),
+                  ),
+                ),
         ],
       ),
     );