using System;
using System.Text.RegularExpressions;
using GameOfLife.Entities;

namespace GameOfLife.IO
{
    public class ApgcodePatternMetaData : PatternMetadata
    {
        private static readonly Regex HeaderRegex = new Regex(@"(?<prefix>\w{2})(?<suffix>.*)");
        public ApgcodePatternMetaData(string header, string name=null)
        {
            if (name != null)
                Name = name;
            var match = HeaderRegex.Match(header);
             Type = Prefix(match.Groups["prefix"].Value);
            Comments = new [] { match.Groups["suffix"].Value };
        }

        private PatternType Prefix(string prefix)
        {
            switch (prefix)
            {
                case "xs": return PatternType.StillLife;
                case "xp": return PatternType.Oscillator;
                case "xq": return PatternType.Spaceship;
                case "yl": return PatternType.Periodic;
                case "methuselah" : return PatternType.Methuselah;
                case "messless" : return PatternType.Diehard;
                case "megasized" : return PatternType.Megasized;
                default:
                    throw new ArgumentException($"Unknown prefix: {prefix}");
            }
        }
    }
}