chnages was made

lib/services/request_service.dart

@@ -0,0 +1,57 @@
+import 'package:flutter/material.dart';
+import '../models/leave_request.dart';
+import '../models/advance_request.dart';
+
+class RequestService {
+  static final RequestService _instance = RequestService._internal();
+  factory RequestService() => _instance;
+  RequestService._internal();
+
+  final List<LeaveRequest> _leaveRequests = [];
+  final List<AdvanceRequest> _advanceRequests = [];
+
+  List<LeaveRequest> get leaveRequests => List.unmodifiable(_leaveRequests);
+  List<AdvanceRequest> get advanceRequests => List.unmodifiable(_advanceRequests);
+
+  Future<void> addLeaveRequest(LeaveRequest request) async {
+    _leaveRequests.add(request);
+    // In a real app, you would save this to a database or API
+  }
+
+  Future<void> addAdvanceRequest(AdvanceRequest request) async {
+    _advanceRequests.add(request);
+    // In a real app, you would save this to a database or API
+  }
+
+  Future<void> updateLeaveRequestStatus(String id, String status) async {
+    final index = _leaveRequests.indexWhere((request) => request.id == id);
+    if (index != -1) {
+      final updatedRequest = LeaveRequest(
+        id: _leaveRequests[index].id,
+        leaveType: _leaveRequests[index].leaveType,
+        isTimedLeave: _leaveRequests[index].isTimedLeave,
+        fromDate: _leaveRequests[index].fromDate,
+        toDate: _leaveRequests[index].toDate,
+        fromTime: _leaveRequests[index].fromTime,
+        toTime: _leaveRequests[index].toTime,
+        reason: _leaveRequests[index].reason,
+        requestDate: _leaveRequests[index].requestDate,
+        status: status,
+      );
+      _leaveRequests[index] = updatedRequest;
+    }
+  }
+
+  Future<void> updateAdvanceRequestStatus(String id, String status) async {
+    final index = _advanceRequests.indexWhere((request) => request.id == id);
+    if (index != -1) {
+      final updatedRequest = AdvanceRequest(
+        id: _advanceRequests[index].id,
+        amount: _advanceRequests[index].amount,
+        reason: _advanceRequests[index].reason,
+        status: status,
+      );
+      _advanceRequests[index] = updatedRequest;
+    }
+  }
+}