import 'dart:io';

void main() {
  List<Map<String, double>> incomeList = [];
  List<Map<String, double>> expenseList = [];

  double totalIncome = 0.0;
  double totalExpenses = 0.0;

  print('Welcome to the Budget Management Application!');
  print('Please choose an option:');
  print('1. Add income');
  print('2. Add expense');
  print('3. View summary');
  print('4. Exit');

  while (true) {
    int choice = int.parse(stdin.readLineSync()!);

    if (choice == 1) {
      print('Enter income description:');
      String description = stdin.readLineSync()!;
      print('Enter income amount:');

      double amount = double.parse(stdin.readLineSync()!);
      if (amount < 0) {
        print('Amount cannot be negative. Please try again.');
        continue;
      }

      incomeList.add({description: amount});
      print('Income added successfully.');
    } else if (choice == 2) {
      print('Enter expense description:');
      String description = stdin.readLineSync()!;

      print('Enter expense amount:');
      double amount = double.parse(stdin.readLineSync()!);
      if (amount < 0) {
        print('Amount cannot be negative. Please try again.');
        continue;
      }

      expenseList.add({description: amount});
      print('Expense added successfully.');
    } else if (choice == 3) {
      incomeList.forEach((income) {
        totalIncome += income.values.first;
      });

      expenseList.forEach((expense) {
        totalExpenses += expense.values.first;
      });

      double netProfit = totalIncome - totalExpenses;

      print('Summary:');

      print('Total income: \$$totalIncome');
      print('Total expenses: \$$totalExpenses');

      if (netProfit >= 0) {
        print('Your Net profit is: \$$netProfit');
        double tax = netProfit * 0.15;
        print('Tax to be paid: \$$tax');
      } else {
        print('Your Net loss is: \$$netProfit');
      }
    } else if (choice == 4) {
      print('Exiting the application. Goodbye!');
      break;
    } else {
      print('Invalid choice. Please try again.');
    }
  }
}