//  Budget Management Application
import 'dart:io';

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

  void addIncome() {
    stdout.write('Enter income description: ');
    String? desc = stdin.readLineSync();
    stdout.write('Enter income amount: ');
    double? amount = double.tryParse(stdin.readLineSync() ?? '');
    if (amount != null && amount > 0) {
      incomeList.add({desc ?? 'Unknown': amount});
      print('Income added successfully.');
    } else {
      print('Invalid amount!');
    }
  }

  void addExpense() {
    stdout.write('Enter expense description: ');
    String? desc = stdin.readLineSync();
    stdout.write('Enter expense amount: ');
    double? amount = double.tryParse(stdin.readLineSync() ?? '');
    if (amount != null && amount > 0) {
      expenseList.add({desc ?? 'Unknown': amount});
      print('Expense added successfully.');
    } else {
      print('Invalid amount!');
    }
  }

  void viewSummary() {
    double totalIncome = incomeList.fold(0, (sum, item) => sum + item.values.first);
    double totalExpense = expenseList.fold(0, (sum, item) => sum + item.values.first);
    double netProfit = totalIncome - totalExpense;

    print('\n--- Budget Summary ---');
    print('Total Income: \$${totalIncome.toStringAsFixed(2)}');
    print('Total Expenses: \$${totalExpense.toStringAsFixed(2)}');
    if (netProfit >= 0) {
      print('Net Profit: \$${netProfit.toStringAsFixed(2)}');
    } else {
      print('Net Loss: \$${netProfit.abs().toStringAsFixed(2)}');
    }

    // حساب الضريبة (اختياري)
    double tax = 0.15 * (netProfit > 0 ? netProfit : 0);
    print('Tax (15% on profit): \$${tax.toStringAsFixed(2)}');
  }

  void run() {
    while (true) {
      print('\nWelcome to the Budget Management Application!');
      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();
          break;
        case '2':
          addExpense();
          break;
        case '3':
          viewSummary();
          break;
        case '4':
          print('Exiting program. Goodbye!');
          return;
        default:
          print('Invalid choice. Try again.');
      }
    }
  }
}

void main() {
  BudgetApp app = BudgetApp();
  app.run();
}