import 'dart:io';

void main() {
  Map<String, double> income = {};
  Map<String, double> expenses = {};

  while (true) {
    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();

    if (choice == '1') {
      stdout.write('Enter income description: ');
      String? desc = stdin.readLineSync();
      stdout.write('Enter income amount: ');
      double amount = double.parse(stdin.readLineSync()!);
      income[desc!] = amount;
      print('Income added!');
    } else if (choice == '2') {
      stdout.write('Enter expense description: ');
      String? desc = stdin.readLineSync();
      stdout.write('Enter expense amount: ');
      double amount = double.parse(stdin.readLineSync()!);
      expenses[desc!] = amount;
      print('Expense added!');
    } else if (choice == '3') {
      double totalIncome = 0;
      double totalExpenses = 0;

      for (var inc in income.entries) {
        totalIncome += inc.value;
      }

      for (var exp in expenses.entries) {
        totalExpenses += exp.value;
      }

      double netProfit = totalIncome - totalExpenses;
      double tax = netProfit > 0 ? netProfit * 0.15 : 0;

      print('\nSummary:');
      print('Total income: \$${totalIncome.toStringAsFixed(2)}');
      print('Total expenses: \$${totalExpenses.toStringAsFixed(2)}');

      if (netProfit >= 0) {
        print('Net profit: \$${netProfit.toStringAsFixed(2)}');
        print('Tax to be paid: \$${tax.toStringAsFixed(2)}');
      } else {
        print('Net loss: \$${netProfit.abs().toStringAsFixed(2)}');
      }

    } else if (choice == '4') {
      print('Exiting the application. Goodbye!');
      break;
    } else {
      print('Invalid option. Please choose 1, 2, 3, or 4.');
    }
  }
}