AdventOfCode/AdventOfCode.Core/Shared/A-Star/AStarNode.cs

namespace AdventOfCode.Core.Shared.A_Star
{
    public class AStarNode : Node
    {
        /// <summary>
        /// Distance from start node
        /// </summary>
        public int GCost { get; set; } = 0;

        /// <summary>
        /// Distance from end node
        /// </summary>
        public int HCost { get; set; }

        /// <summary>
        /// Total cost (G + F)
        /// </summary>
        public int FCost => GCost + HCost;

        public bool? IsClosed { get; private set; } = null;

        public AStarNode? ParentNode { get; set; }

        public AStarNode(Node position) : base(position)
        { }

        public AStarNode(int x, int y, char value) : base(x, y, value)
        { }

        public void OpenNode() => IsClosed = false;

        public void CloseNode() => IsClosed = true;

        public bool CanMoveTo(AStarNode target)
        {
            int diff = target.Integer - Integer; ;
            return diff == 0 || diff == 1;
        }
    }
}