using System;
using System.Collections.Generic;
using System.IO;
using CodeImp.DoomBuilder.ZDoom;
using CodeImp.DoomBuilder.GZBuilder.Data;

namespace CodeImp.DoomBuilder.GZBuilder.GZDoom 
{
	internal class ModeldefParser : ZDTextParser 
	{
		private Dictionary<string, ModelData> entries; //classname, entry
		internal Dictionary<string, ModelData> Entries { get { return entries; } }
		internal string Source { get { return sourcename; } }

		internal ModeldefParser() 
		{
			entries = new Dictionary<string, ModelData>(StringComparer.Ordinal);
		}

		//should be called after all decorate actors are parsed 
		public override bool Parse(Stream stream, string sourcefilename) 
		{
			base.Parse(stream, sourcefilename);
			entries = new Dictionary<string, ModelData>(StringComparer.Ordinal);

			// Continue until at the end of the stream
			while (SkipWhitespace(true)) 
			{
				string token = ReadToken();
				if (!string.IsNullOrEmpty(token)) 
				{
					token = StripTokenQuotes(token).ToLowerInvariant();
					if (token == "model") //model structure start
					{ 
						//find classname
						SkipWhitespace(true);
						string className = StripTokenQuotes(ReadToken(ActorStructure.ACTOR_CLASS_SPECIAL_TOKENS)).ToLowerInvariant();

						if(!string.IsNullOrEmpty(className) && !entries.ContainsKey(className)) 
						{
							//now find opening brace
							SkipWhitespace(true);
							token = ReadToken();
							if (token != "{") 
							{
								General.ErrorLogger.Add(ErrorType.Error, "Unexpected token found in '"+sourcefilename+"' at line "+GetCurrentLineNumber()+": expected '{', but got '" + token + "'");
								continue; //something wrong with modeldef declaration, continue to next one
							}

							ModeldefStructure mds = new ModeldefStructure();
							ModelData mde = mds.Parse(this);
							if (mde != null) entries.Add(className, mde);
						}
					} 
					else 
					{
						// Unknown structure!
						string token2;
						if (token != "{") 
						{
							do
							{
								if (!SkipWhitespace(true)) break;
								token2 = ReadToken();
								if (string.IsNullOrEmpty(token2)) break;
							} 
							while (token2 != "{");
						}

						int scopelevel = 1;
						do 
						{
							if (!SkipWhitespace(true)) break;
							token2 = ReadToken();
							if (string.IsNullOrEmpty(token2)) break;
							if (token2 == "{") scopelevel++;
							if (token2 == "}") scopelevel--;
						}
						while (scopelevel > 0);
					}

				}

			}

			return entries.Count > 0;
		}
	}
}