namespace HexGrid.Math
{
    
    public struct HexCoord {
        
        public int q; // axial q(col)
        public int r; // axial r(row)
        public HexCoord(int q, int r) { this.q = q; this.r = r; }
        public static readonly HexCoord[] neighbors = {
            new HexCoord(+1, 0),
            new HexCoord(+1, -1),
            new HexCoord(0, -1),
            new HexCoord(-1, 0),
            new HexCoord(-1, +1),
            new HexCoord(0, +1)
        };
        public HexCoord Neighbor(int i) => new HexCoord(q + neighbors[i].q, r + neighbors[i].r);

        public override bool Equals(object obj) {
            if (!(obj is HexCoord)) return false;
            HexCoord o = (HexCoord)obj;
            return q == o.q && r == o.r;
        }
        //??
        public override int GetHashCode() => q * 73856093 ^ r * 19349663;
        public override string ToString() => $"({q},{r})";
    }

}