import 'dart:io';

void main() {
  // متغيرات الميزانية
  double totalIncome = 0.0;
  double totalExpenses = 0.0;

  print('Welcome to the Budget Management Application!');

  bool isRunning = true;
  while (isRunning) {
    print('\nPlease choose an option:');
    print('1. Add income');
    print('2. Add expense');
    print('3. View summary');
    print('4. Exit');
    stdout.write('Enter your choice: ');

    String? choice = stdin.readLineSync();

    switch (choice) {
      case '1':
        // Add income
        stdout.write('Enter income description: ');
        String? description = stdin.readLineSync();

        stdout.write('Enter income amount: ');
        String? amountInput = stdin.readLineSync();
        double? amount = double.tryParse(amountInput ?? '');

        if (amount == null || amount <= 0) {
          print('Invalid amount. Please enter a positive number.');
        } else {
          totalIncome += amount;
          print('Income added!');
        }
        break;

      case '2':
        // Add expense
        stdout.write('Enter expense description: ');
        String? description = stdin.readLineSync();

        stdout.write('Enter expense amount: ');
        String? amountInput = stdin.readLineSync();
        double? amount = double.tryParse(amountInput ?? '');

        if (amount == null || amount <= 0) {
          print('Invalid amount. Please enter a positive number.');
        } else {
          totalExpenses += amount;
          print('Expense added!');
        }
        break;

      case '3':
        // View summary
        double netProfit = totalIncome - totalExpenses;
        double tax = netProfit > 0 ? netProfit * 0.15 : 0.0; // 15% tax

        print('\nSummary:');
        print('Total income: \$${totalIncome.toStringAsFixed(2)}');
        print('Total expenses: \$${totalExpenses.toStringAsFixed(2)}');
        print('Net profit: \$${netProfit.toStringAsFixed(2)}');
        print('Tax to be paid: \$${tax.toStringAsFixed(2)}');
        break;

      case '4':
        isRunning = false;
        print('Exiting the application. Goodbye!');
        break;

      default:
        print('Invalid choice. Please enter a number between 1 and 4.');
    }
  }
}