using System.Security.Cryptography;
using System.Text.RegularExpressions;

using Dungeoneer.Lexing;

namespace Dungeoneer {

	public class RollResult {
		public dynamic Value { get; private set; }

		private RollResult() { Value = null; }
		public RollResult(string expression) {
			Value = Scripting.Expr($"eval('{expression}')");
		}

		internal static class Style {
			internal const string Default	= "\x1b[1m";

			internal const string BoolTrue	= "\x1b[32;1m";
			internal const string BoolFalse	= "\x1b[31;1m";
		}

		public override string ToString() {
			string style;
			switch(Value) {
				case bool boolValue:
					style = boolValue ? Style.BoolTrue : Style.BoolFalse;
					break;
				default:
					style = Style.Default;
					break;
			}

			return $"{style}{Value}{Format.Reset}";
		}

		public static RollResult Wrap(dynamic value) {
			var output = new RollResult();
			output.Value = value;
			return output;
		}

	}

	public class RollExpression {
		private IList<string> Parts;
		public string Print { get; private set; }
		public string Expression { get; private set; }
		public RollResult Result {
			get {
				try { return new RollResult(Expression); }
				catch { return null; }
			}
		}

		public RollExpression(IList<string> parts) {
			this.Parts = parts;
			this.Print = "";
			this.Expression = "";

			//	build expression from string parts
			foreach(string piece in Parts) {
				//	die expression substitution
				var dieCheck = DiceToken.Match(piece);
				if(dieCheck.Success) {
					var token = new DiceToken(dieCheck);

					this.Print += $"{token} ";
					this.Expression += $"{token.Value} ";
				} else {
					var part = $"{piece} ";
					this.Expression += part;
					this.Print += part;
				}
			}
		}

	}

	public static class RollMacro {

		public static void Pool(IList<string> args) {
			DiceToken? dice = null;
			int? dc = null;

			for(int i = 1; i < args.Count; i++) {
				string arg = args[i];
				var dieCheck = DiceToken.Match(arg);
				if(dieCheck.Success)
					dice = new DiceToken(dieCheck);
				else
					dc = int.Parse(arg);
			}

			var rolls = dice.Result;
			bool success = false;
			foreach(var roll in rolls)
				if(roll > dc.Value) {
					success = true;
					break;
				}
			var result = RollResult.Wrap(success);
			Console.WriteLine($"{dice}\n => {result}");
		}

	}

}