using System;
using System.Collections.Generic;

namespace GameOfLife.Entities
{
    public class Cell : Tuple<short, short>
    {
        public Cell(short x, short y) : base(x, y)
        {
        }
        public Cell(short x, int y) : base(x, (short)y) { }
        public Cell(int x, short y) : base((short)x, y) { }
        public Cell(int x, int y) : base((short)x, (short)y) { }

        public static Cell operator +(Cell cell1, Cell cell2)
            => new Cell(cell1.Item1 + cell2.Item1, cell1.Item2 + cell2.Item2);

        public static Cell operator -(Cell cell1, Cell cell2)
            => new Cell(cell1.Item1 - cell2.Item1, cell1.Item2 - cell2.Item2);

        public Cell Negate()
            => new Cell(-Item1, -Item2);

        public IEnumerable<Cell> NeighborCells => new []
        {
            new Cell(Item1 - 1, Item2 - 1), new Cell(Item1 - 1, Item2), new Cell(Item1 - 1, Item2 + 1),
            new Cell(Item1, Item2 - 1),                                      new Cell(Item1, Item2 + 1),
            new Cell(Item1 + 1, Item2 - 1), new Cell(Item1 + 1, Item2), new Cell(Item1 + 1, Item2 + 1),
        };

        public override string ToString()
        {
            return $"[{Item1}, {Item2}]";
        }
    }
}