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;
    }
  }
}