namespace ProjectCruiser.MovementStrategy
{
    /// <summary>
    /// Стратегия перемещения объекта к краю экрана
    /// </summary>
    internal class MoveToBorder : AbstractStrategy
    {
        protected override bool IsTargetDestinaion()
        {
            ObjectParameters? objParams = GetObjectParameters;
            if (objParams == null)
            {
                return false;
            }
            return objParams.RightBorder - GetStep() <= FieldWidth
            && objParams.RightBorder + GetStep() >= FieldWidth &&
            objParams.DownBorder - GetStep() <= FieldHeight
            && objParams.DownBorder + GetStep() >= FieldHeight;
        }
        protected override void MoveToTarget()
        {
            ObjectParameters? objParams = GetObjectParameters;
            if (objParams == null)
            {
                return;
            }
            int diffX = objParams.RightBorder - FieldWidth;
            if (Math.Abs(diffX) > GetStep())
            {
                if (diffX > 0)
                {
                    MoveLeft();
                }
                else
                {
                    MoveRight();
                }
            }
            int diffY = objParams.DownBorder - FieldHeight;
            if (Math.Abs(diffY) > GetStep())
            {
                if (diffY > 0)
                {
                    MoveUp();
                }
                else
                {
                    MoveDown();
                }
            }
        }
    }
}