use Vehicle.Car;
use Vehicle.Engine;

Car/Equinox -> hasEngine {
    String model;
    Integer year;
    Decimal fuelEfficiency;
    Boolean isRunning;
    Decimal fuelLevel;
    Decimal mileage;

    fn on_create(String model, Integer year) -> [Null] {
        my.model.set(model);
        my.year.set(year);
        my.fuelEfficiency.set(28.5);
        my.isRunning.set(False);
        my.fuelLevel.set(100.0);
        my.mileage.set(0.0);
        rtn Null;
    }

    fn startEngine() -> [Boolean] {
        Boolean engineStatus.set(Boolean.and(my.isRunning.not(True), my.fuelLevel.gt(0.0)));
        my.isRunning.set(engineStatus);
        rtn engineStatus;
    }

    fn calculateFuelConsumption(Decimal distance) -> [Decimal] {
        Decimal consumption.set(distance.divide(my.fuelEfficiency));
        rtn consumption;
    }

    fn checkMaintenance() -> [Boolean] {
        Boolean needsMaintenance.set(my.mileage.gte(50000.0));
        rtn needsMaintenance;
    }

    +fn drive(Decimal miles) -> [Null] {
        my.mileage.add(miles);
        my.fuelLevel.subtract(my.calculateFuelConsumption(miles));
        rtn Null;
    }
}