import 'dart:io';

void main() {
  // قوائم لتخزين الدخل والمصروفات
  List<Map<String, double>> incomeList = [];
  List<Map<String, double>> expenseList = [];

  while (true) {
    // عرض القائمة للمستخدم
    print("\nWelcome 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");

    stdout.write("Enter your choice: ");
    String? choice = stdin.readLineSync();

    switch (choice) {
      case '1':
        addIncome(incomeList);
        break;
      case '2':
        addExpense(expenseList);
        break;
      case '3':
        viewSummary(incomeList, expenseList);
        break;
      case '4':
        print("Exiting the application. Goodbye!");
        return;
      default:
        print("Invalid choice. Please try again.");
    }
  }
}

// دالة لإضافة دخل
void addIncome(List<Map<String, double>> incomeList) {
  stdout.write("Enter income description: ");
  String? description = stdin.readLineSync();
  stdout.write("Enter income amount: ");
  double? amount = double.tryParse(stdin.readLineSync() ?? '');

  if (description != null && amount != null && amount > 0) {
    incomeList.add({description: amount});
    print("Income added!");
  } else {
    print("Invalid input. Please enter a valid amount.");
  }
}

// دالة لإضافة مصروف
void addExpense(List<Map<String, double>> expenseList) {
  stdout.write("Enter expense description: ");
  String? description = stdin.readLineSync();
  stdout.write("Enter expense amount: ");
  double? amount = double.tryParse(stdin.readLineSync() ?? '');

  if (description != null && amount != null && amount > 0) {
    expenseList.add({description: amount});
    print("Expense added!");
  } else {
    print("Invalid input. Please enter a valid amount.");
  }
}

// دالة لحساب وعرض الملخص
void viewSummary(List<Map<String, double>> incomeList, List<Map<String, double>> expenseList) {
  double totalIncome = incomeList.fold(0, (sum, item) => sum + item.values.first);
  double totalExpenses = expenseList.fold(0, (sum, item) => sum + item.values.first);
  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).toStringAsFixed(2)}");
  }
}