Maria ahmed Alnasi_251001282

import 'dart:io';

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

  while (true) {
    print("\n===== Budget Management Menu =====");
    print("1. Add Income");
    print("2. Add Expense");
    print("3. View Summary");
    print("4. Exit");
    stdout.write("Enter your choice: ");
    var choice = stdin.readLineSync();

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

    if (choice == '1') {
      stdout.write("Enter income description: ");
      var desc = stdin.readLineSync();
      stdout.write("Enter income amount: ");
      var amount = double.tryParse(stdin.readLineSync() ?? '');

      if (amount != null && amount > 0) {
        incomeList.add({desc ?? 'Unknown': amount});
        print("Income added successfully!");
      } else {
        print("Invalid amount! Must be positive.");
      }

    } else if (choice == '2') {
      stdout.write("Enter expense description: ");
      var desc = stdin.readLineSync();
      stdout.write("Enter expense amount: ");
      var amount = double.tryParse(stdin.readLineSync() ?? '');

      if (amount != null && amount > 0) {
        expenseList.add({desc ?? 'Unknown': amount});
        print("Expense added successfully!");
      } else {
        print("Invalid amount! Must be positive.");
      }

    } else if (choice == '3') {
      double totalIncome = 0;
      double totalExpense = 0;

      for (var i in incomeList) {
        totalIncome += i.values.first;
      }
      for (var e in expenseList) {
        totalExpense += e.values.first;
      }

      double net = totalIncome - totalExpense;

      print("\n===== Summary =====");
      print("Total Income: \$${totalIncome.toStringAsFixed(2)}");
      print("Total Expense: \$${totalExpense.toStringAsFixed(2)}");

      if (net > 0) {
        print("Net Profit: \$${net.toStringAsFixed(2)}");
        // Optional: tax calculation
        double tax = net * 0.15;
        print("Tax to be paid (15%): \$${tax.toStringAsFixed(2)}");
      } else if (net < 0) {
        print("Net Loss: \$${net.abs().toStringAsFixed(2)}");
      } else {
        print("Break-even: No profit or loss.");
      }
    } else {
      print("Invalid choice! Please try again.");
    }
  }
}