chnages has been made for the request leave and request advance

lib/services/request_service.dart

@@ -1,31 +1,57 @@
-import 'package:flutter/material.dart';
+import 'dart:async';
 import '../models/leave_request.dart';
 import '../models/advance_request.dart';
 
 class RequestService {
+  // Singleton implementation
   static final RequestService _instance = RequestService._internal();
   factory RequestService() => _instance;
   RequestService._internal();
 
   final List<LeaveRequest> _leaveRequests = [];
   final List<AdvanceRequest> _advanceRequests = [];
+  
+  // Stream controllers to notify listeners of changes
+  final _leaveRequestsController = StreamController<List<LeaveRequest>>.broadcast();
+  final _advanceRequestsController = StreamController<List<AdvanceRequest>>.broadcast();
+  
+  // Stream getters
+  Stream<List<LeaveRequest>> get leaveRequestsStream => _leaveRequestsController.stream;
+  Stream<List<AdvanceRequest>> get advanceRequestsStream => _advanceRequestsController.stream;
 
-  List<LeaveRequest> get leaveRequests => List.unmodifiable(_leaveRequests);
-  List<AdvanceRequest> get advanceRequests => List.unmodifiable(_advanceRequests);
+  // Get all leave requests as a Future
+  Future<List<LeaveRequest>> getLeaveRequests() async {
+    print("Getting ${_leaveRequests.length} leave requests");
+    return List.from(_leaveRequests);
+  }
 
+  // Get all advance requests as a Future
+  Future<List<AdvanceRequest>> getAdvanceRequests() async {
+    print("Getting ${_advanceRequests.length} advance requests");
+    return List.from(_advanceRequests);
+  }
+
+  // Add a new leave request
   Future<void> addLeaveRequest(LeaveRequest request) async {
     _leaveRequests.add(request);
-    // In a real app, you would save this to a database or API
+    print("Added leave request: ${request.id}, total: ${_leaveRequests.length}");
+    // Notify listeners
+    _leaveRequestsController.add(List.from(_leaveRequests));
   }
 
+  // Add a new advance request
   Future<void> addAdvanceRequest(AdvanceRequest request) async {
     _advanceRequests.add(request);
-    // In a real app, you would save this to a database or API
+    print("Added advance request: ${request.id}, total: ${_advanceRequests.length}");
+    // Notify listeners
+    _advanceRequestsController.add(List.from(_advanceRequests));
   }
 
+  // Update leave request status
   Future<void> updateLeaveRequestStatus(String id, String status) async {
     final index = _leaveRequests.indexWhere((request) => request.id == id);
     if (index != -1) {
+      // Create a new request with the updated status
       final updatedRequest = LeaveRequest(
         id: _leaveRequests[index].id,
         leaveType: _leaveRequests[index].leaveType,
@@ -36,22 +62,40 @@ class RequestService {
         toTime: _leaveRequests[index].toTime,
         reason: _leaveRequests[index].reason,
         requestDate: _leaveRequests[index].requestDate,
-        status: status,
+        status: status, // Updated status
       );
+      
+      // Replace the old request with the updated one
       _leaveRequests[index] = updatedRequest;
+      print("Updated leave request status: $id to $status");
+      // Notify listeners
+      _leaveRequestsController.add(List.from(_leaveRequests));
     }
   }
 
+  // Update advance request status
   Future<void> updateAdvanceRequestStatus(String id, String status) async {
     final index = _advanceRequests.indexWhere((request) => request.id == id);
     if (index != -1) {
+      // Create a new request with the updated status
       final updatedRequest = AdvanceRequest(
         id: _advanceRequests[index].id,
         amount: _advanceRequests[index].amount,
         reason: _advanceRequests[index].reason,
-        status: status,
+        status: status, // Updated status
       );
+      
+      // Replace the old request with the updated one
       _advanceRequests[index] = updatedRequest;
+      print("Updated advance request status: $id to $status");
+      // Notify listeners
+      _advanceRequestsController.add(List.from(_advanceRequests));
     }
   }
+  
+  // Dispose method to close streams
+  void dispose() {
+    _leaveRequestsController.close();
+    _advanceRequestsController.close();
+  }
 }