import 'dart:io';

void main() {

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

  while (true) {

    print("\nBudget Management");
    print("1. Add Income");
    print("2. Add Expense");
    print("3. View Summary");
    print("4. Exit");

    stdout.write("Choose option: ");
    int choice = int.parse(stdin.readLineSync()!);

    if (choice == 1) {

      stdout.write("Income description: ");
      String desc = stdin.readLineSync()!;

      stdout.write("Amount: ");
      double amount = double.parse(stdin.readLineSync()!);

      if (amount > 0) {
        incomeList.add({desc: amount});
      } else {
        print("Invalid amount!");
      }

    } else if (choice == 2) {

      stdout.write("Expense description: ");
      String desc = stdin.readLineSync()!;

      stdout.write("Amount: ");
      double amount = double.parse(stdin.readLineSync()!);

      if (amount > 0) {
        expenseList.add({desc: amount});
      } else {
        print("Invalid amount!");
      }

    } else if (choice == 3) {

      double totalIncome = 0;
      double totalExpense = 0;

      for (var item in incomeList) {
        totalIncome += item.values.first;
      }

      for (var item in expenseList) {
        totalExpense += item.values.first;
      }

      double net = totalIncome - totalExpense;

      print("\nTotal Income: $totalIncome");
      print("Total Expenses: $totalExpense");

      if (net > 0) {
        double tax = net * 0.15;
        print("Net Profit: $net");
        print("Tax (15%): $tax");
      } else {
        print("Net Loss: ${net.abs()}");
      }

    } else if (choice == 4) {
      print("Goodbye!");
      break;
    }

  }
}