using System.Text.RegularExpressions;

namespace Dungeoneer {

	public sealed class Command {

		public static void Roll(IList<string> args) {
			if(args.Count == 0)
				return;
			var expression = "";

			foreach(string arg in args) {
				string part;
				if(arg.Contains('d')) {
					var parts = arg.Split('d');
					var first = parts[0];
					var second = parts[1];

					int count;
					int sides;
					try {
						count = int.Parse(first);
						sides = int.Parse(second);
					} catch {
						Console.WriteLine("'{arg}' is not a valid dice expression");
						return;
					}

					var result = 0;
					for(int i = 0; i < count; i++)
						result += Util.Roll(sides);
					part = result.ToString();
				} else
					part = arg;
				expression += $"{part} ";
			}
			
			dynamic output = Scripting.Expr($"eval('{expression}')");
			Console.WriteLine($"{expression}\n=> {output}");
		}

	}

}