링크로그인 동작

userfront/lib/features/auth/presentation/login_screen.dart

@@ -42,6 +42,10 @@ class _LoginScreenState extends ConsumerState<LoginScreen>
   final TextEditingController _shortCodePrefixController = TextEditingController();
   final TextEditingController _shortCodeDigitsController = TextEditingController();
   String? _linkPendingRef;
+  String? _lastLinkLoginId;
+  bool _lastLinkIsEmail = true;
+  int _linkResendSeconds = 0;
+  Timer? _linkResendTimer;
 
   @override
   void initState() {
@@ -111,10 +115,30 @@ class _LoginScreenState extends ConsumerState<LoginScreen>
 
   void _resetLinkLoginState() {
     _linkPendingRef = null;
+    _lastLinkLoginId = null;
+    _lastLinkIsEmail = true;
+    _linkResendTimer?.cancel();
+    _linkResendTimer = null;
+    _linkResendSeconds = 0;
     _shortCodePrefixController.clear();
     _shortCodeDigitsController.clear();
   }
 
+  void _startLinkResendTimer(int seconds) {
+    _linkResendSeconds = seconds;
+    _linkResendTimer?.cancel();
+    _linkResendTimer = Timer.periodic(const Duration(seconds: 1), (timer) {
+      if (!mounted) return;
+      setState(() {
+        if (_linkResendSeconds > 0) {
+          _linkResendSeconds--;
+        } else {
+          timer.cancel();
+        }
+      });
+    });
+  }
+
   // Helper to decode JWT and get loginId
   String _getLoginIdFromJwt(String jwt) {
     try {
@@ -406,6 +430,7 @@ class _LoginScreenState extends ConsumerState<LoginScreen>
     _passwordController.dispose();
     _shortCodePrefixController.dispose();
     _shortCodeDigitsController.dispose();
+    _linkResendTimer?.cancel();
     super.dispose();
   }
 
@@ -496,11 +521,14 @@ class _LoginScreenState extends ConsumerState<LoginScreen>
       final mode = (initResponse['mode'] ?? '').toString();
       final provider = (initResponse['provider'] ?? '').toString();
       final interval = initResponse['interval'];
+      final resendAfter = initResponse['resendAfter'];
       debugPrint("[Auth] Link Sent. PendingRef: $pendingRef, Mode: $mode, Provider: $provider");
 
       if (mounted) {
         setState(() {
           _linkPendingRef = pendingRef?.toString();
+          _lastLinkLoginId = loginId;
+          _lastLinkIsEmail = isEmail;
         });
         Navigator.of(context).pop(); // Close Loading
 
@@ -512,15 +540,16 @@ class _LoginScreenState extends ConsumerState<LoginScreen>
         final initialInterval = (interval is int && interval > 0)
             ? Duration(seconds: interval)
             : const Duration(seconds: 2);
+        if (resendAfter is int && resendAfter > 0) {
+          _startLinkResendTimer(resendAfter);
+        }
         _pollForSession(pendingRef, initialInterval: initialInterval);
       }
     } catch (e) {
       debugPrint("[Auth] Initialization failed: $e");
       if (mounted && Navigator.canPop(context)) Navigator.of(context).pop();
       if (mounted) {
-        setState(() {
-          _linkPendingRef = null;
-        });
+        setState(_resetLinkLoginState);
       }
       if (e.toString().contains("User not registered")) {
         _showUnregisteredDialog();
@@ -537,6 +566,9 @@ class _LoginScreenState extends ConsumerState<LoginScreen>
     debugPrint("[Auth] Starting poll for ref: $pendingRef");
 
     while (attempts < maxAttempts && mounted) {
+      if (_linkPendingRef != pendingRef) {
+        return;
+      }
       await Future.delayed(pollInterval);
       attempts++;
 
@@ -883,6 +915,24 @@ class _LoginScreenState extends ConsumerState<LoginScreen>
                                       ),
                                       child: const Text("코드로 로그인"),
                                     ),
+                                    const SizedBox(height: 12),
+                                    TextButton(
+                                      onPressed: _linkResendSeconds > 0
+                                          ? null
+                                          : () {
+                                              final loginId = _lastLinkLoginId ?? _linkIdController.text.trim();
+                                              if (loginId.isEmpty) {
+                                                _showError("이메일 또는 휴대폰 번호를 입력해 주세요.");
+                                                return;
+                                              }
+                                              _startEnchantedFlow(loginId, isEmail: _lastLinkIsEmail || loginId.contains('@'));
+                                            },
+                                      child: Text(
+                                        _linkResendSeconds > 0
+                                            ? "재발송 (${_formatTime(_linkResendSeconds)})"
+                                            : "재발송",
+                                      ),
+                                    ),
                                   ],
                                 ],
                               ),