public override ShipPosition Move(ShipPosition position)
{
if (position.Lost)
{
return(position);
}
switch (position.Orientation)
{
case Orientation.East:
position.Orientation = Orientation.North;
break;
case Orientation.North:
position.Orientation = Orientation.West;
break;
case Orientation.West:
position.Orientation = Orientation.South;
break;
case Orientation.South:
position.Orientation = Orientation.East;
break;
default:
throw new NotImplementedException(string.Format("Ship's orientation {0} is not supported for the Left Instruction", position.Orientation.ToString()));
}
return(position);
}
public override bool WillBeLost(ShipPosition position)
{
//TODO refactor to make cleaner
if (position.Orientation == Orientation.East && position.X < TopRight.X)
{
return(false);
}
if (position.Orientation == Orientation.West && position.X > BottomLeft.X)
{
return(false);
}
if (position.Orientation == Orientation.North && position.Y < TopRight.Y)
{
return(false);
}
if (position.Orientation == Orientation.South && position.Y > BottomLeft.Y)
{
return(false);
}
return(true);
}
public override ShipPosition Move(ShipPosition position)
{
if (position.Lost)
{
return(position);
}
//validate if the move will result in the ship being lost
if (WillBeLost(position))
{
//mark position as lost, keep old poistion
position.Lost = true;
return(position);
}
//move position based on orientation
switch (position.Orientation)
{
case Orientation.East:
position.X = position.X + MovePositions;
break;
case Orientation.North:
position.Y = position.Y + MovePositions;
break;
case Orientation.West:
position.X = position.X - MovePositions;
break;
case Orientation.South:
position.Y = position.Y - MovePositions;
break;
default:
throw new NotImplementedException(string.Format("Ship's orientation {0} is not supported for the Move Instruction", position.Orientation.ToString()));
}
return(position);
}
/// <summary>
/// WillBeLost : Validates whether the instruction can be executed on the ships current position
/// </summary>
/// <param name="position">current position of the ship</param>
/// <returns></returns>
public virtual bool WillBeLost(ShipPosition position)
{
return(false);
}
//for a given position, move to new position/orientation public abstract ShipPosition Move(ShipPosition position);
