using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ProjectAirbus.MovementStrategy
{
    internal class MoveToBorder : AbstractStrategy
    {

        // достигнута ли цель
        protected override bool IsTargetDestination()
        {
            var objParams = GetObjectParameters;
            if (objParams == null)
            {
                return false;
            }
            return objParams.RightBorder <= FieldWidth &&
                objParams.RightBorder + GetStep() >= FieldWidth &&
                objParams.DownBorder <= FieldHeight &&
                objParams.DownBorder + GetStep() >= FieldHeight;
        }

        // движение к цели
        protected override void MoveToTarget()
        {
            var objParams = GetObjectParameters;
            if (objParams == null)
            {
                return;
            }
            var diffX = FieldWidth;
            if (Math.Abs(diffX) > GetStep())
            {
                if (diffX < 0)
                {
                    MoveLeft();
                }
                else
                {
                    MoveRight();
                }
            }

            var diffY = FieldHeight;
            if (Math.Abs(diffY) > GetStep())
            {
                if (diffY < 0)
                {
                    MoveUp();
                }
                else
                {
                    MoveDown();
                }
            }
        }
    }
}