using System.Collections.Generic;

namespace AdventOfCode.Core.Shared
{
    public class Grid<T> where T : Node
    {
        public List<T> DataGrid { get; set; } = new List<T>();

        public Grid(T[] data) => DataGrid.AddRange(data);

        public Grid(IEnumerable<T> data) : this(data.ToArray()) { }

        public IEnumerable<T> GetRow(int rowNumber) => DataGrid.Where(n => n.X == rowNumber);
        public IEnumerable<T> GetColumn(int columnNumber) => DataGrid.Where(n => n.Y == columnNumber);

        public IEnumerable<T> GetNeighbors(T source, bool allowDiagonals = true)
        {
            IEnumerable <T>  neighbors = DataGrid.Where(target => Math.Abs(source.X - target.X) <= 1 || Math.Abs(source.Y - target.Y) <= 1);

            if (allowDiagonals)
            {
                return neighbors;
            }

            return neighbors.Where(target => !(Math.Abs(source.X - target.X) <= 1 && Math.Abs(source.Y - target.Y) <= 1));

        }
    }

}