import 'dart:io';

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


  while (true){
    print('\n=== Budget Management ===');
    print('1. Add Income');
    print('2. Add Expense');
    print('3. View Summary');
    print('4. Exit');
    stdout.write('Enter your choice:');
    String? choice = stdin.readLineSync();

    if (choice == '4') {
      print('Exiting Budget Manager...');
      break;
    }

    switch (choice){
      case '1':
      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 ?? 'Income' : amount});
        print('Income added successfully!');
      }else{
        print('Invalid amount!');

      }
      break;

      case '2':
      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 ?? 'Expense': amount});
        print('Expense added successfully!');
      }else{
        print('Invalid amount!');
      }
      break;

      case '3':
      double totalIncome = 0;
      double totalExpense = 0;

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

      double net = totalIncome - totalExpense;

      print('\n--- Summary ---');
      print('Total Income: \$${totalIncome.toStringAsFixed(2)}');
      print('Total Expenses: \$${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, No Loss.');
      }

      break;


    default:
       print('Invalid choice, please try again.')  
    }
  }
}