using System;

public class Program
{
	public static void Main()
	{
		Console.WriteLine("Hello World");
		Elevator elevator = new Elevator();
		while(true) {
			Console.WriteLine("\nPlease enter a value: ");
			String value = Console.ReadLine();
			elevator.run(Double.Parse(value));
		}
	}
}

class Elevator {
  const double tiltThreshold =  20;
  const double setpoint      = -10;

  double currentAngle = 0;
  bool   isFront      = true;

  public void run(double currentAngle) {
    this.currentAngle = currentAngle;
    run();
  }

  public void run() {
    double error = setpoint - this.currentAngle;
	Console.WriteLine("Current error: {0}", error);

    if(Math.Abs(error) >= tiltThreshold) {
	  Console.WriteLine("Toggling direction.");
      isFront = error <= 0 ? false : true;
	}

    if(isFront == false) {
      setBackElevator(1);
      setFrontElevator(0);
    }

    else {
      setBackElevator(0);
      setFrontElevator(1);
    }
  }

  public void setBackElevator(double value) {
    if(value > 0)
      Console.WriteLine("Running the back elevator down.");
    else if(value == 0)
      Console.WriteLine("Stopping the back elevator.");
  }

  public void setFrontElevator(double value) {
    if(value > 0)
      Console.WriteLine("Running the front elevator down.");
    else if(value == 0)
      Console.WriteLine("Stopping the front elevator.");
  }
}