using System.Linq;

namespace Life.Automaton
{
    public static class GameOfLife
    {
        public static Rule Rule(string born, string survive)
        {
            bool WillSurvive(int neighbours) => survive.Contains(neighbours.ToString());
            bool WillBorn(int neighbours) => born.Contains(neighbours.ToString());
            
            return field =>
            {
                var @new = new Cell[field.Size.Width, field.Size.Height];

                for (int i = 0; i < field.Size.Width; i++)
                {
                    for (int j = 0; j < field.Size.Height; j++)
                    {
                        var neighbours = field.Neighbours(i, j).Count(c => c.IsAlive);
                        
                        @new[i,j] = new Cell
                        {
                            IsAlive = field[i,j].IsAlive ? WillSurvive(neighbours) : WillBorn(neighbours)
                        };
                    }
                }
                
                return @new;
            };
        }
    }
}