main.dart

void main() {
  Car car1 = Car("1", "Mazda", "CX-5");
  Car car2 = Car("2", "Mazda", "CX-3");
  Car car3 = Car("3", "Toyota", "Prius");
  Car car4 = Car("4", "Toyota", "Rav4");
  Car car5 = Car("5", "Ford", "Kuga");
  Car car6 = Car("6", "Ford", "Puma");
  Car car7 = Car("7", "Honda", "Civic");
  Car car8 = Car("8", "Honda", "Accord");
  Car car9 = Car("9", "BMW", "x1");
  Car car10 = Car("10", "BMW", "x3");

  CarDeliveryImpl cardelivery = CarDeliveryImpl();
  cardelivery.addNewcar(car1);
  cardelivery.addNewcar(car1);
  cardelivery.addNewcar(car1);
  cardelivery.addNewcar(car1);

  cardelivery.addNewcar(car2);
  cardelivery.addNewcar(car3);
  cardelivery.addNewcar(car4);
  cardelivery.addNewcar(car5);
  cardelivery.addNewcar(car6);
  cardelivery.addNewcar(car7);
  cardelivery.addNewcar(car8);
  cardelivery.addNewcar(car10);

  print('Car id 100 deleted  ${cardelivery.deleteCar("100").toString()}');
  
  print('Car id 7 deleted  ${cardelivery.deleteCar("100").toString()}');

  print('Cars with model CX-5  ${cardelivery.listCarsByModel("CX-5")}');
  print('Cars with name BMW  ${cardelivery.listCarsByName("BMW")}');
}

class Car {
  String id;
  String name;
  String model;
  Car(this.id, this.name, this.model);
}

abstract class CarDelivery {
  void addNewcar(Car car);
  int deleteCar(String id);
  List<String> listCarsByName(String searchQuery);
  List<String> listCarsByModel(String searchQuery);
}

class CarDeliveryImpl extends CarDelivery {
  List cars = [];

  @override
  void addNewcar(Car car) {
    cars.add(car);
  }

  @override
  int deleteCar(String id) {
    var found = cars.firstWhere((car) => car.id == id, orElse: () => null);

    if (found != null) {
      bool removed = cars.remove(found);
      return int.parse(found.id);
    }
    return -1;
  }

  @override
  List<String> listCarsByModel(String searchQuery) {
    final filteredThings =
        cars.where((car) => car.model.contains(searchQuery)).toList();
    return filteredThings.map((car) => car.model.toString()).toList();
  }

  @override
  List<String> listCarsByName(String searchQuery) {
    final filteredThings =
        cars.where((car) => car.name.contains(searchQuery)).toList();
    return filteredThings.map((car) => car.name.toString()).toList();
  }
}