import 'package:flutter/material.dart';

void main() {
  final lamborghini = Car(maxSpeed: 300, strength: 90);
  final ferrari = Car(maxSpeed: 280, strength: 95);
  ferrari.drive(3);
  lamborghini.drive(4);
  runApp(
    MaterialApp(
      home: Scaffold(
        body: Center(
          child: Column(
            children: <Widget>[
              Text(
                Car.getAllInfo([lamborghini, ferrari]),
                style: TextStyle(fontSize: 33),
              ),
              Text(lamborghini.beats(ferrari).toString(),
                  style: TextStyle(fontSize: 40))
            ],
          ),
        ),
      ),
    ),
  );
}

class Car {
  Car({this.maxSpeed, this.strength = 100, this.fuel = 200});
  final int maxSpeed;
  int odo = 0;
  int strength, fuel;

  static String getAllInfo(List<Car> cars) =>
    cars.map((car) => car.getInfo()).join('\n\n');

  void drive([int times = 1]) {
    for (int i = 0; i < times; i++) {
      if (fuel < maxSpeed ~/ 10) {
        fuel = 0;
        break;
      }
      if (strength < 10) {
        strength = 0;
        break;
      }
      odo++;
      strength -= 10;
      fuel -= maxSpeed ~/ 10;
    }
  }

  bool beats(Car car) => strength > car.strength;

  String getInfo() => 'Max Speed = $maxSpeed\n'
      'Strength = $strength\nFuel = $fuel\nODO = $odo';
}