feat: creating invites frontend

frontend/lib/constants/api_constants.dart

@@ -11,4 +11,5 @@ class ApiConstants {
   // Invitation endpoints
   static const String getAllInvitationsEndpoint = '/invitations/all';
   static const String acceptInvitationEndpoint = '/invitations/accept';
+  static const String createInvitationEndpoint = '/invitations/create';
 }

frontend/lib/screens/pages/invitations_page.dart

@@ -459,11 +459,14 @@ class _InvitationsPageState extends State<InvitationsPage>
               ),
             ),
       floatingActionButton: FloatingActionButton(
-        onPressed: () {
+        onPressed: () async {
-          Navigator.push(
+          final result = await Navigator.push(
             context,
             MaterialPageRoute(builder: (context) => CreateInvitationPage()),
           );
+          if (result == true) {
+            _loadInvitations();
+          }
         },
         backgroundColor: Color(0xFF6A4C93),
         child: Icon(Icons.add, color: Colors.white),
@@ -487,16 +490,17 @@ class _CreateInvitationPageState extends State<CreateInvitationPage> {
   DateTime? _selectedDate;
   TimeOfDay? _selectedTime;
   int? _selectedTagIndex;
+  bool _isSubmitting = false;
 
   final List<Map<String, dynamic>> _availableTags = [
-    {"name": "Sports", "color_hex": "#FF6B35", "icon_name": "sports_soccer"},
+    {"id": 1, "name": "Sports", "color_hex": "#FF6B35", "icon_name": "sports_soccer"},
-    {"name": "Food", "color_hex": "#F7931E", "icon_name": "restaurant"},
+    {"id": 2, "name": "Food", "color_hex": "#F7931E", "icon_name": "restaurant"},
-    {"name": "Gaming", "color_hex": "#FFD23F", "icon_name": "games"},
+    {"id": 3, "name": "Gaming", "color_hex": "#FFD23F", "icon_name": "games"},
-    {"name": "Study", "color_hex": "#06FFA5", "icon_name": "menu_book"},
+    {"id": 4, "name": "Study", "color_hex": "#06FFA5", "icon_name": "menu_book"},
-    {"name": "Social", "color_hex": "#118AB2", "icon_name": "group"},
+    {"id": 5, "name": "Social", "color_hex": "#118AB2", "icon_name": "group"},
-    {"name": "Travel", "color_hex": "#06D6A0", "icon_name": "flight"},
+    {"id": 6, "name": "Travel", "color_hex": "#06D6A0", "icon_name": "flight"},
-    {"name": "Music", "color_hex": "#8E44AD", "icon_name": "music_note"},
+    {"id": 7, "name": "Music", "color_hex": "#8E44AD", "icon_name": "music_note"},
-    {"name": "Movies", "color_hex": "#E74C3C", "icon_name": "movie"},
+    {"id": 8, "name": "Movies", "color_hex": "#E74C3C", "icon_name": "movie"},
   ];
 
   @override
@@ -577,7 +581,7 @@ class _CreateInvitationPageState extends State<CreateInvitationPage> {
     }
   }
 
-  void _handleSubmit() {
+  Future<void> _handleSubmit() async {
     if (_formKey.currentState!.validate()) {
       if (_selectedTagIndex == null) {
         ScaffoldMessenger.of(context).showSnackBar(
@@ -589,28 +593,54 @@ class _CreateInvitationPageState extends State<CreateInvitationPage> {
         return;
       }
 
+      setState(() {
+        _isSubmitting = true;
+      });
+
+      DateTime? combinedDateTime;
+      if (_selectedDate != null) {
+        if (_selectedTime != null) {
+          combinedDateTime = DateTime(
+            _selectedDate!.year,
+            _selectedDate!.month,
+            _selectedDate!.day,
+            _selectedTime!.hour,
+            _selectedTime!.minute,
+          );
+        } else {
+          combinedDateTime = _selectedDate;
+        }
+      }
+
       final invitationData = {
         "title": _titleController.text.trim(),
         "description": _descriptionController.text.trim(),
-        "date": _selectedDate?.toIso8601String(),
+        "dateTime": combinedDateTime?.toIso8601String(),
-        "time": _selectedTime != null
-            ? "${_selectedTime!.hour}:${_selectedTime!.minute.toString().padLeft(2, '0')}"
-            : null,
         "location": _locationController.text.trim().isEmpty
             ? null
             : _locationController.text.trim(),
-        "max_participants": int.parse(_maxParticipantsController.text),
+        "maxParticipants": int.parse(_maxParticipantsController.text),
-        "tag": _availableTags[_selectedTagIndex!],
+        "tagId": _availableTags[_selectedTagIndex!]["id"],
       };
 
-      print("Invitation JSON: $invitationData");
+      final result = await InvitationsService.createInvitation(invitationData);
 
-      ScaffoldMessenger.of(context).showSnackBar(
+      if (mounted) {
-        SnackBar(
+        setState(() {
-          content: Text('Invitation created! Check console for JSON output.'),
+          _isSubmitting = false;
-          backgroundColor: Color(0xFF6A4C93),
+        });
-        ),
+
-      );
+        if (result['success']) {
+          Navigator.of(context).pop(true);
+        } else {
+          ScaffoldMessenger.of(context).showSnackBar(
+            SnackBar(
+              content: Text(result['message'] ?? 'Failed to create invitation'),
+              backgroundColor: Colors.red,
+            ),
+          );
+        }
+      }
     }
   }
 
@@ -932,7 +962,7 @@ class _CreateInvitationPageState extends State<CreateInvitationPage> {
                           Container(
                             height: 56,
                             child: ElevatedButton(
-                              onPressed: _handleSubmit,
+                              onPressed: _isSubmitting ? null : _handleSubmit,
                               style: ElevatedButton.styleFrom(
                                 backgroundColor: Color(0xFF6A4C93),
                                 foregroundColor: Colors.white,
@@ -941,13 +971,22 @@ class _CreateInvitationPageState extends State<CreateInvitationPage> {
                                 ),
                                 elevation: 2,
                               ),
-                              child: Text(
+                              child: _isSubmitting
-                                'Create Invitation',
+                                  ? SizedBox(
-                                style: TextStyle(
+                                      height: 20,
-                                  fontSize: 18,
+                                      width: 20,
-                                  fontWeight: FontWeight.w600,
+                                      child: CircularProgressIndicator(
-                                ),
+                                        strokeWidth: 2,
-                              ),
+                                        valueColor: AlwaysStoppedAnimation<Color>(Colors.white),
+                                      ),
+                                    )
+                                  : Text(
+                                      'Create Invitation',
+                                      style: TextStyle(
+                                        fontSize: 18,
+                                        fontWeight: FontWeight.w600,
+                                      ),
+                                    ),
                             ),
                           ),
                         ],

frontend/lib/services/invitations_service.dart

@@ -85,4 +85,50 @@ class InvitationsService {
       };
     }
   }
+
+  static Future<Map<String, dynamic>> createInvitation(Map<String, dynamic> invitationData) async {
+    try {
+      final response = await HttpService.post(
+        ApiConstants.createInvitationEndpoint,
+        invitationData,
+      );
+
+      if (response.statusCode == 200) {
+        final responseData = jsonDecode(response.body);
+        if (responseData['status'] == true) {
+          return {
+            'success': true,
+            'data': responseData['data'],
+            'message': responseData['message'],
+          };
+        } else {
+          return {
+            'success': false,
+            'message': responseData['message'] ?? 'Failed to create invitation',
+          };
+        }
+      } else if (response.statusCode == 401) {
+        return {
+          'success': false,
+          'message': 'Session expired. Please login again.',
+        };
+      } else if (response.statusCode == 403) {
+        return {
+          'success': false,
+          'message': 'Access denied. Invalid credentials.',
+        };
+      } else {
+        return {
+          'success': false,
+          'message': 'Server error (${response.statusCode})',
+        };
+      }
+    } catch (e) {
+      print('Error creating invitation: $e');
+      return {
+        'success': false,
+        'message': 'Network error. Please check your connection.',
+      };
+    }
+  }
 }