using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
using GameOfLife.Entities;

namespace GameOfLife
{
    public static class Util
    {
        public static Pattern ToPattern(this IEnumerable<Cell> cells)
        {
            return new Pattern(cells.ToList());
        }
        
        //https://stackoverflow.com/a/63820524
        public static IEnumerable<string> SplitByLine(this string str)
        {
            return Regex
                .Split(str, @"((\r)+)?(\n)+((\r)+)?")
                .Select(i => i.Trim())
                .Where(i => !string.IsNullOrEmpty(i));
        }

        public static IEnumerable<Pattern> FindOscillation(this ILife gol, int maxPeriod = 50)
        {
            var list = new List<Pattern>();

            while (gol.Generation < maxPeriod)
            {
                var currentPattern = gol.LivingCells.ToPattern().Normalize();
                if (list.Contains(currentPattern))
                    return list;

                list.Add(currentPattern);
                gol.IncrementGeneration();
            }

            return list.Take(1); // didn't find any oscillations, return the first pattern
        }
    }
}