void main() {
  print("Welcome to the Budget Management Application!");

  // محاكاة إدخال المستخدم
  var userActions = [
    {'choice': '1', 'desc': 'Sales', 'amount': 10000.0},
    {'choice': '2', 'desc': 'Rent', 'amount': 3000.0},
    {'choice': '3'},
    {'choice': '4'},
  ];

  List<Map<String, double>> incomeList = [];
  List<Map<String, double>> expenseList = [];

  for (var action in userActions) {
    String choice = (action['choice'] as String?) ?? '';

    if (choice == '1') {
      String desc = (action['desc'] as String?) ?? 'Income';
      double amount = (action['amount'] is num)
          ? (action['amount'] as num).toDouble()
          : 0.0;

      incomeList.add({desc: amount});
      print("\nEnter your choice: 1");
      print("Enter income description: $desc");
      print("Enter income amount: $amount");
      print("Income added!");

    } else if (choice == '2') {
      String desc = (action['desc'] as String?) ?? 'Expense';
      double amount = (action['amount'] is num)
          ? (action['amount'] as num).toDouble()
          : 0.0;

      expenseList.add({desc: amount});
      print("\nEnter your choice: 2");
      print("Enter expense description: $desc");
      print("Enter expense amount: $amount");
      print("Expense added!");

    } else if (choice == '3') {
      print("\nEnter your choice: 3");

      double totalIncome =
          incomeList.fold(0, (sum, item) => sum + item.values.first);
      double totalExpenses =
          expenseList.fold(0, (sum, item) => sum + item.values.first);
      double net = totalIncome - totalExpenses;

      print("Summary:");
      print("Total income: \$${totalIncome.toStringAsFixed(0)}");
      print("Total expenses: \$${totalExpenses.toStringAsFixed(0)}");

      if (net > 0) {
        double tax = net * 0.15;
        print("Net profit: \$${net.toStringAsFixed(0)}");
        print("Tax to be paid: \$${tax.toStringAsFixed(0)}");
      } else if (net < 0) {
        print("Net loss: \$${net.abs().toStringAsFixed(0)}");
      } else {
        print("No profit, no loss.");
      }

    } else if (choice == '4') {
      print("\nEnter your choice: 4");
      print("Exiting the application. Goodbye!");
      break;
    }
  }
}