using RoadTrain.MovementStrategy;

namespace RoadTrain.MovementStrategy
{
	/// <summary>
	/// Стратегия перемещения объекта в центр экрана
	/// </summary>
	public class MoveToBorder : AbstractStrategy
	{
		protected override bool IsTargetDestinaion()
		{
			var objParams = GetObjectParameters;
			if (objParams == null)
			{
				return false;
			}
			return objParams.RightBorder <= FieldWidth &&
			objParams.RightBorder + GetStep() >= FieldWidth &&
			objParams.DownBorder <= FieldHeight &&
			objParams.DownBorder + GetStep() >= FieldHeight;
		}
		protected override void MoveToTarget()
		{
			var objParams = GetObjectParameters;
			if (objParams == null)
			{
				return;
			}
			var diffX = objParams.ObjectMiddleHorizontal - FieldWidth;
			if (Math.Abs(diffX) > GetStep())
			{
				if (diffX > 0)
				{
					MoveLeft();
				}
				else
				{
					MoveRight();
				}
			}
			var diffY = objParams.ObjectMiddleVertical - FieldHeight;
			if (Math.Abs(diffY) > GetStep())
			{
				if (diffY > 0)
				{
					MoveUp();
				}
				else
				{
					MoveDown();
				}
			}
		}
	}
}