import 'dart:io';

class BudgetManagementApp {
  List<Map<String, dynamic>> incomeList = [];
  List<Map<String, dynamic>> expenseList = [];
  static const double taxRate = 0.15;
  
  void addIncome() {
    stdout.write('Enter income description: ');
    String? description = stdin.readLineSync();
    
    stdout.write('Enter income amount: ');
    String? amountInput = stdin.readLineSync();
    
    try {
      double amount = double.parse(amountInput!);
      if (amount < 0) {
        print('Invalid amount! Please enter a positive value.');
        return;
      }
      
      incomeList.add({
        'description': description ?? 'Unknown',
        'amount': amount
      });
      
      print('Income added!');
    } catch (e) {
      print('Invalid amount! Please enter a valid number.');
    }
  }
  
  void addExpense() {
    stdout.write('Enter expense description: ');
    String? description = stdin.readLineSync();
    
    stdout.write('Enter expense amount: ');
    String? amountInput = stdin.readLineSync();
    
    try {
      double amount = double.parse(amountInput!);
      if (amount < 0) {
        print('Invalid amount! Please enter a positive value.');
        return;
      }
      
      expenseList.add({
        'description': description ?? 'Unknown',
        'amount': amount
      });
      
      print('Expense added!');
    } catch (e) {
      print('Invalid amount! Please enter a valid number.');
    }
  }
  
  void viewSummary() {
    double totalIncome = calculateTotal(incomeList);
    double totalExpenses = calculateTotal(expenseList);
    double netProfit = totalIncome - totalExpenses;
    
    print('\nSummary:');
    print('Total income: \$${totalIncome.toStringAsFixed(2)}');
    print('Total expenses: \$${totalExpenses.toStringAsFixed(2)}');
    
    if (netProfit >= 0) {
      print('Net profit: \$${netProfit.toStringAsFixed(2)}');
      
      // حساب الضريبة باستخدام العامل الثلاثي
      double tax = netProfit > 0 ? netProfit * taxRate : 0;
      if (tax > 0) {
        print('Tax to be paid: \$${tax.toStringAsFixed(2)}');
      }
    } else {
      print('Net loss: \$${(-netProfit).toStringAsFixed(2)}');
    }
    
    // عرض التفاصيل
    if (incomeList.isNotEmpty) {
      print('\nIncome Details:');
      for (var income in incomeList) {
        print('- ${income['description']}: \$${income['amount'].toStringAsFixed(2)}');
      }
    }
    
    if (expenseList.isNotEmpty) {
      print('\nExpense Details:');
      for (var expense in expenseList) {
        print('- ${expense['description']}: \$${expense['amount'].toStringAsFixed(2)}');
      }
    }
  }
  
  double calculateTotal(List<Map<String, dynamic>> list) {
    double total = 0;
    for (var item in list) {
      total += item['amount'];
    }
    return total;
  }
  
  void run() {
    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('\nEnter your choice: ');
      String? choice = stdin.readLineSync();
      
      switch (choice) {
        case '1':
          addIncome();
          break;
          
        case '2':
          addExpense();
          break;
          
        case '3':
          viewSummary();
          break;
          
        case '4':
          print('Exiting the application. Goodbye!');
          return;
          
        default:
          print('Invalid choice! Please enter a number between 1 and 4.');
      }
    }
  }
}

void main() {
  BudgetManagementApp budgetApp = BudgetManagementApp();
  budgetApp.run();
}