import 'dart:io';

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

  bool isRunning = true;

  print("=== Welcome to the Budget Management Application ===");

  while (isRunning) {
    print("\n--- Main Menu ---");
    print("1. Add Income");
    print("2. Add Expense");
    print("3. View Summary (Profit/Loss)");
    print("4. Exit");
    stdout.write("Choose an option: ");

    String? choice = stdin.readLineSync()?.trim();

    if (choice == '1') {
      // إضافة دخل
      stdout.write("Enter income description: ");
      String desc = stdin.readLineSync() ?? "Income";
      stdout.write("Enter amount: ");
      double? amount = double.tryParse(stdin.readLineSync()!);

      if (amount != null && amount > 0) {
        incomeList.add({desc: amount});
        print(">>> Income added successfully.");
      } else {
        print(">>> Invalid amount! Please enter a positive number.");
      }

    } else if (choice == '2') {
      // إضافة مصروفات
      stdout.write("Enter expense description: ");
      String desc = stdin.readLineSync() ?? "Expense";
      stdout.write("Enter amount: ");
      double? amount = double.tryParse(stdin.readLineSync()!);

      if (amount != null && amount > 0) {
        expenseList.add({desc: amount});
        print(">>> Expense added successfully.");
      } else {
        print(">>> Invalid amount! Please enter a positive number.");
      }

    } else if (choice == '3') {
      // حساب الإجمالي
      double totalIncome = 0;
      for (var item in incomeList) {
        totalIncome += item.values.first;
      }

      double totalExpense = 0;
      for (var item in expenseList) {
        totalExpense += item.values.first;
      }

      double netResult = totalIncome - totalExpense;

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

      if (netResult >= 0) {
        print("Your net profit is \$${netResult.toStringAsFixed(2)}");
        
        // حساب الضريبة (15%) باستخدام 
        double tax = netResult > 0 ? netResult * 0.15 : 0;
        if (tax > 0) {
          print("Tax to be paid (15%): \$${tax.toStringAsFixed(2)}");
        }
      } else {
        // في حالة الخسارة (القيمة سالبة نضربها في -1 لعرضها موجبة)
        print("Your net loss is \$${(netResult * -1).toStringAsFixed(2)}");
      }

    } else if (choice == '4') {
      print("Exiting application... Goodbye!");
      isRunning = false;
    } else {
      print("Invalid option, please try again.");
    }
  }
}