using System;
using System.Collections.Generic;
using System.Runtime.Remoting.Messaging;
namespace sharp.extensions.commandline
{
	public class ArgumentReader
	{
		List<string> arguments = new List<string>();

		public string CurrentElement { get; private set; }

		public string CurrentOption { get; private set; }
		public bool CurrentIsLong { get; private set; }
		public bool CurrentIsShort { get; private set; }

		public ArgumentReader(String[] arguments)
		{
			this.arguments.AddRange(arguments);
			this.CurrentElement = null;
			this.CurrentOption = null;
			this.CurrentIsLong = false;
			this.CurrentIsShort = false;
		}

		public bool Next()
		{
			if (CurrentElement.IsNull() || CurrentElement.Equals(""))
			{
				if (arguments.Count == 0)
				{
					return false;
				}

				CurrentElement = arguments[0];
				arguments.RemoveAt(0);

				if (CurrentElement.StartsWith("--"))
				{
					CurrentIsLong = true;
					CurrentIsShort = true;
					CurrentOption = CurrentElement.Substring(2);
					CurrentElement = null;
					return true;
				}
				else if (CurrentElement.StartsWith("-"))
				{
					CurrentIsLong = false;
					CurrentIsShort = true;
					CurrentOption = CurrentElement[1].ToString();
					CurrentElement = CurrentElement.Substring(2);
					return true;
				}
				CurrentOption = CurrentElement;
				CurrentElement = null;
				CurrentIsLong = false;
				CurrentIsShort = false;
				return true;
			}
			else
			{
				CurrentOption = CurrentElement[0].ToString();
				CurrentElement = CurrentElement.Substring(1);
				return true;
			}
		}

		public string PopArgument()
		{
			string arg = this.arguments[0];
			this.arguments.RemoveAt(0);
			return arg;
		}

	}
}