import 'dart:io';

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

  print('Welcome to the Budget Management Application!');

  while (true) {
    print('\nPlease choose an option:');
    print('1. Add Income');
    print('2. Add Expense');
    print('3. View Summary');
    print('4. Exit');

    stdout.write('Enter your choice: ');
    String? input = stdin.readLineSync();
    int? choice = int.tryParse(input ?? '');

    if (choice == null) {
      print('Invalid choice. Please enter a number between 1 and 4.');
      continue;
    }

    if (choice == 1) {
      // إضافة دخل
      stdout.write('Enter income description: ');
      String description = stdin.readLineSync() ?? '';

      stdout.write('Enter income amount: ');
      double? amount = double.tryParse(stdin.readLineSync() ?? '');

      if (amount == null || amount <= 0) {
        print('Invalid amount. Income must be a positive number.');
      } else {
        incomeList.add({description: amount});
        print('Income added successfully.');
      }

    } else if (choice == 2) {
      // إضافة مصروف
      stdout.write('Enter expense description: ');
      String description = stdin.readLineSync() ?? '';

      stdout.write('Enter expense amount: ');
      double? amount = double.tryParse(stdin.readLineSync() ?? '');

      if (amount == null || amount <= 0) {
        print('Invalid amount. Expense must be a positive number.');
      } else {
        expenseList.add({description: amount});
        print('Expense added successfully.');
      }

    } else if (choice == 3) {
      // عرض الملخص
      double totalIncome = 0;
      double totalExpenses = 0;

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

      for (var expense in expenseList) {
        totalExpenses += expense.values.first;
      }

      double net = totalIncome - totalExpenses;

      print('\n----- Budget Summary -----');
      print('Total Income: \$${totalIncome.toStringAsFixed(2)}');
      print('Total Expenses: \$${totalExpenses.toStringAsFixed(2)}');

      if (net >= 0) {
        print('Your net profit is \$${net.toStringAsFixed(2)}');

        // حساب الضريبة (اختياري)
        double tax = net > 0 ? net * 0.15 : 0;
        print('Tax to be paid (15%): \$${tax.toStringAsFixed(2)}');
      } else {
        print('Your net loss is \$${net.abs().toStringAsFixed(2)}');
      }

    } else if (choice == 4) {
      print('Exiting the application. Goodbye!');
      break;

    } else {
      print('Invalid choice. Please enter a number between 1 and 4.');
    }
  }
}