namespace AirBomber.MovementStrategy
{
    public class MoveToCenterStrategy : AbstractStrategy
    {
        protected override bool IsTargetDestination()
        {
            ObjectParameters? ObjParams = ObjectParameters;
            if (ObjParams is null)
                return false;

            float FieldMiddleHorizontal = FieldWidth / 2;
            float FieldMiddleVertical = FieldHeight / 2;

            return
                Math.Abs(ObjParams.ObjectMiddleHorizontal - FieldMiddleHorizontal) < GetStep() &&
                Math.Abs(ObjParams.ObjectMiddleVertical - FieldMiddleVertical) < GetStep();
        }

        protected override void MoveToTarget()
        {
            ObjectParameters? ObjParams = ObjectParameters;
            if (ObjParams is null)
                return;

            float diffX = ObjParams.ObjectMiddleHorizontal - FieldWidth / 2;
            if (Math.Abs(diffX) > GetStep())
            {
                if (diffX > 0)
                    MoveLeft();
                else
                    MoveRight();
            }

            float diffY = ObjParams.ObjectMiddleVertical - FieldHeight / 2;
            if (Math.Abs(diffY) > GetStep())
            {
                if (diffY > 0)
                    MoveUp();
                else
                    MoveDown();
            }
        }
    }
}