import 'dart:io';

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

  print("Welcome to the budget Management Application ! ");

  while (true) {
    print("Pleace choose an option : ");
    print("1. Add income");
    print("2. Add expense ");
    print("3. View summary ");
    print("4. Exist");

    print("Enter your choice :");
    String? choice = stdin.readLineSync();

    if (choice == "1") {
      print("Enter income description :");
      String? desc = stdin.readLineSync();
      choice = choice?.trim();

      print("Enter income amount");
      double amount = double.parse(stdin.readLineSync()!);

      if (amount < 0) {
        print("amount can not be negative !");
        continue;
      }

      incomeList.add({desc!: amount});
      print("Income added!");
    } else if (choice == "2") {
      print("Enter expense decription :");
      String? desc = stdin.readLineSync();
      choice = choice?.trim();

      print("Enter your amount :");
      double amount = double.parse(stdin.readLineSync()!);

      if (amount < 0) {
        print("Amount can not be negative ! ");
        continue;
      }
      expenseList.add({desc!: amount});
      print("Expense added !");
    } else if (choice == "3") {
      double totalIncome = incomeList.fold(
        0,
        (sum, item) => sum + item.values.first,
      );

      double totalExpenses = expenseList.fold(
        0,
        (sum, item) => sum + item.values.first,
      );

      double net = totalIncome - totalExpenses;

      double tax = net > 0 ? net * 0.15 : 0;

      print(" Summary :");
      print("Total income : \$${totalIncome}");
      print("Total expenses : \$${totalExpenses}");

      if (net >= 0) {
        print("Net profit : \$${net}");
        print("Tax to be paid : \$${tax}");
      } else {
        print("Net loss :  \$${net.abs()}");
      }
    } else if (choice == "4") {
      print("Exiting the application .Goodbye !");
      break;
    } else {
      print("Invalid choice , please try again . ");
    }
  }
}