import 'dart:math';

enum Car{Lada, BMW, Skoda}

extension CarX on Car{
  static List<Car> generateRandomCar(int n){
    var rnd = Random();
    return List.generate(n, (i) => Car.values[rnd.nextInt(Car.values.length)]);
  }
}

class NewCar{
  final String name;
  double cost;

  NewCar(this.name, this.cost);

  String get info => 'New car: $name, cost: $cost';
}

class OldCar extends NewCar{
  final int mileage;

  OldCar(
      super.name,
      super.cost, {
        required this.mileage
      });

  double costOldCar(cost, mileage){
    return cost - (mileage * 0.7);
  }
  //String info() => 'Old car: $name, cost: $cost, mileage: $mileage';
}

void main(){
  asynchronous();
}

Future<void> asynchronous() async{
    for (int i = 1; i < 5; i++) {
      List<Car> car = CarX.generateRandomCar(1);
      final auto = NewCar('$car', i * 1000000);
      await Future.delayed(
        const Duration(milliseconds: 10),
          () => print(auto.info),
      );
      final oldAuto = OldCar('$car', i * 1000000 - (i * 100000 * 0.7), mileage: i * 100000);
      await Future.delayed(
        const Duration(milliseconds: 20),
            () => print(oldAuto.info),
      );
      print('');
  }
}