speed.go

package speed

// Car implements a simulated remote controller car.
type Car struct {
	speed        int
	batteryDrain int
	battery      int
	distance     int
}

// NewCar creates a new Car with full battery and given specs
func NewCar(speed, batteryDrain int) Car {
	return Car{
		speed:        speed,
		batteryDrain: batteryDrain,
		battery:      100,
	}
}

// Track implements a race track.
type Track struct {
	distance int
}

// NewTrack created a new track
func NewTrack(distance int) Track {
	return Track{
		distance: distance,
	}
}

// Drive drives the car one time. If there is not enough battry to drive on more time,
// the car will not move but use the leftover battery.
func Drive(car Car) Car {
	if car.battery >= car.batteryDrain {
		car.distance += car.speed
		car.battery -= car.batteryDrain
	}
	return car
}

// CanFinish checks if a car is able to finish a certain track.
func CanFinish(car Car, track Track) bool {
	for car.battery > 0 {
		car = Drive(car)
	}
	return car.distance >= track.distance
}