/// <summary>
/// Change state of traffic light on red
/// </summary>
/// <param name="trafficLight"> Object of traffic light for changing its state </param>
/// <exception cref="ArgumentNullException"> If trafficLight is null </exception>
public void Change(TrafficLightState trafficLight)
{
if (trafficLight == null)
{
throw new ArgumentNullException($"The patametr {nameof(trafficLight)} can't be null!");
}
trafficLight.State = new RedState();
}
/// <summary>
/// Run cycle of change states for traffic light
/// </summary>
/// <param name="initState"> Initial state </param>
/// <param name="shiftsNumber"> Number of changes states </param>
/// <returns> Collection of colours </returns>
/// <exception cref="ArgumentNullException"> If initState is null </exception>
public static IEnumerable <ColourOption> Start(ILightState initState, int shiftsNumber)
{
var trafficLight = new TrafficLightState(initState);
for (int i = 0; i < shiftsNumber; i++)
{
yield return(trafficLight.Colour);
trafficLight.Change();
}
}