import 'dart:io';
void main(){
  print("Welcome to the Budget Management Application!");

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

  bool managingBudget = true;


  print("Please choose an option:");
  print("1. Add income");
  print("2. Add expense");
  print("3. View summary");
  print("4. Exit");

  while(managingBudget){
    stdout.write("\nEnter your choice: ");
    String? choice = stdin.readLineSync();



    if (choice == '1') {
      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) {
       incomeList.add({description ?? 'Unknown': amount});
       print('Income added!');
     } else {
      print('Invalid amount. Please enter a positive number.');
     }
    }
 



     if (choice == '2') {
      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) {
    expenseList.add({description ?? 'Unknown': amount});
    print('Expense added!');
   } else {
     print('Invalid amount. Please enter a positive number.');
     }
    }




      if (choice == '3') {
      double totalIncome = 0;
      double totalExpenses = 0;
      for (var entry in incomeList) {
        totalIncome += entry.values.first;
      }
      for (var entry in expenseList) {
        totalExpenses += entry.values.first;
      }
      double net = totalIncome - totalExpenses;
      print('Summary:');
      print('Total income: \$${totalIncome.toStringAsFixed(0)}');
      print('Total expenses: \$${totalExpenses.toStringAsFixed(0)}');
      if (net >= 0) {
        print('Net profit: \$${net.toStringAsFixed(0)}');
        double tax = net * 0.15;
        print('Tax to be paid: \$${tax.toStringAsFixed(0)}');
      } else {
        print('Net loss: \$${net.toStringAsFixed(0)}');
      }
    } 

     


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




      if (choice != '1' && choice != '2' && choice != '3' && choice != '4') {
      print('Invalid choice. Please try again.');
    } 
  }
}