import 'dart:io';

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

  while (true) {
    print('\nThe Budget Mangement Application! \n Choose an option :');
    print('1. Add Income');
    print('2. Add Expense');
    print('3. View Summary');
    print('4. Exit');
    stdout.write('Enter Choose : ');
    String? choice = stdin.readLineSync();

    if (choice == '1') {
      stdout.write('Enter income description : ');
      String? desc = stdin.readLineSync();
      stdout.write('Enter income amount : ');
      String? input = stdin.readLineSync();
      double? amount = double.tryParse(input ?? '');
      if (amount != null && amount > 0) {
        incomeList.add({desc ?? 'income': amount});
        print('Income added!');
      } else {
        print('Invaild amount.');
      }
    } else if (choice == '2') {
      stdout.write('Enter expense description : ');
      String? desc = stdin.readLineSync();
      stdout.write('Enter expense amount : ');
      String? input = stdin.readLineSync();
      double? amount = double.tryParse(input ?? '');
      if (amount != null && amount > 0) {
        expenseList.add({desc ?? 'Expense': amount});
        print('Expense added!');
      } else {
        print('Invaild amount.');
      }
    } else if (choice == '3') {
      double totalIncome = 0;
      double totalExpense = 0;

      for (var i in incomeList) {
        totalIncome += i.values.first;
      }
      for (var e in expenseList) {
        totalExpense += e.values.first;
      }

      double net = totalIncome - totalExpense;
      print('\nSummary :');
      print('Total Income : \$${totalIncome.toStringAsFixed(2)}');
      print('Total Expense : \$${totalExpense.toStringAsFixed(2)}');

      if (net > 0) {
        double tax = net * 0.15;
        print('Net Profit : \$${net.toStringAsFixed(2)}');
        print('Tax (15%) : \$${tax.toStringAsFixed(2)}');
      } else if (net < 0) {
        print('Net Loss : \$${net.abs().toStringAsFixed(2)}');
      } else {
        print('No profit or loss.');
      }
    } else if (choice == '4') {
      print('Exiting The Application. \n Goodbye!');
      return;
    } else {
      print('Invaild choice.');
    }
  }
}