using System;
using System.Text.RegularExpressions;
using VEPROMS.CSLA.Library;
namespace Volian.Controls.Library
{
	public partial class LinkText
	{
		public LinkText(string linkInfoText)
		{
			_LinkInfoText = linkInfoText;
		}
		public void ParseLink()
		{
			if (_MyParsedLinkType == ParsedLinkType.NotParsed)
			{
				if (_LinkInfoText == null) return;
				// First parse the string
				if (_LinkInfoText.Contains(@"\v"))
					throw new Exception("LinkText.ParseLink found RTF token");
				// for tran : "2, #, #, # and 4#Link:TransitionRange:2 10 173 166"
				Match m = Regex.Match(_LinkInfoText, @"(.*)[#]Link:([A-Za-z]*):(.*)");
				//for debugging
                //string _MyValue = m.Groups[1].Value;
                //string _MyLink = $"#Link:{m.Groups[2].Value}:{m.Groups[3].Value}";
				switch (m.Groups[2].Value)
				{
					case "ReferencedObject":
						_MyParsedLinkType = ParsedLinkType.ReferencedObject;
						string[] subs = m.Groups[3].Value.Split(" ".ToCharArray());
						if (subs[0].IndexOf("CROUSGID")>-1)
							_MyRoUsageInfo = null;
						else if (subs[0].IndexOf("NewID") > -1)
							_MyRoUsageInfo = null;
						else
						{
							int roUsageid = Convert.ToInt32(subs[0]);
							_MyRoUsageInfo = RoUsageInfo.Get(roUsageid);
						}
						break;
					case "Transition":
					case "TransitionRange":
						_MyParsedLinkType = (ParsedLinkType)Enum.Parse(_MyParsedLinkType.GetType(), m.Groups[2].Value);
						string[] subst = m.Groups[3].Value.Split(" ".ToCharArray());
						if (subst[1].IndexOf("CTID") > -1)
							_MyTransitionInfo = null;
						else if (subst[1].IndexOf("NewID") > -1)
							_MyTransitionInfo = null;
						else
						{
							int transitionID = Convert.ToInt32(m.Groups[3].Value.Split(" ".ToCharArray())[1]);
							_MyTransitionInfo = TransitionInfo.Get(transitionID);
						}
						break;
				}
			}
		}
		private readonly string _LinkInfoText;
        public string LinkInfoText => _LinkInfoText;
        private TransitionInfo _MyTransitionInfo = null;
		public TransitionInfo MyTransitionInfo
		{
			get { ParseLink(); return _MyTransitionInfo; }
		}
		public ItemInfo MyTranToItemInfo
		{
			get { ParseLink(); return _MyTransitionInfo.MyItemToID; }
		}
		public ItemInfo MyTranRangeItemInfo
		{
			get { ParseLink(); return _MyTransitionInfo.MyItemRangeID; }
		}
		private RoUsageInfo _MyRoUsageInfo;
		public RoUsageInfo MyRoUsageInfo
		{
			get { ParseLink(); return _MyRoUsageInfo; }
		}
		private ParsedLinkType _MyParsedLinkType = ParsedLinkType.NotParsed;
	}
	#region enums
	public enum ParsedLinkType : int
	{
		NotParsed = 0,
		Transition = 1,
		TransitionRange = 2,
		ReferencedObject = 3
	}
	#endregion
}