#region ================== Copyright (c) 2007 Pascal vd Heiden

/*
 * Copyright (c) 2007 Pascal vd Heiden, www.codeimp.com
 * This program is released under GNU General Public License
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 */

#endregion

#region ================== Namespaces

using System;
using System.Collections.Generic;
using CodeImp.DoomBuilder.IO;

#endregion

namespace CodeImp.DoomBuilder.Map
{
	public enum MapElementType
	{
		UNKNOWN,
		VERTEX,
		SIDEDEF,
		LINEDEF,
		SECTOR,
		THING
	}
	
	public abstract class MapElement : IDisposable
	{
		#region ================== Constants

		#endregion

		#region ================== Variables
		
		// List index
		protected int listindex;
		
		// Univeral fields
		private UniFields fields;
		
		// Marking
		protected bool marked;
		
		// Disposing
		protected bool isdisposed;
		
		// Error Ignoring (mxd)
		private List<Type> ignorederrorchecks;

		//mxd. Hashing
		private static int hashcounter;
		private readonly int hashcode;

		//mxd. Element type
		protected MapElementType elementtype;
		
		#endregion
		
		#region ================== Properties

		public int Index { get { return listindex; } internal set { listindex = value; } }
		public UniFields Fields { get { return fields; } }
		public bool Marked { get { return marked; } set { marked = value; } }
		public bool IsDisposed { get { return isdisposed; } }
		public List<Type> IgnoredErrorChecks { get { return ignorederrorchecks; } } //mxd
		public MapElementType ElementType { get { return elementtype; } } //mxd

		#endregion

		#region ================== Constructor / Disposer

		// Constructor
		protected MapElement()
		{
			// Initialize
			fields = new UniFields(this);
			ignorederrorchecks = new List<Type>(); //mxd
			hashcode = hashcounter++; //mxd
		}

		// Disposer
		public virtual void Dispose()
		{
			if(!isdisposed)
			{
				// Clean up
				fields.Owner = null;
				fields = null;

				// Done
				isdisposed = true;
			}
		}

		#endregion

		#region ================== Methods

		// Serialize / deserialize
		internal void ReadWrite(IReadWriteStream s)
		{
			int c = fields.Count;
			s.rwInt(ref c);

			if(s.IsWriting)
			{
				foreach(KeyValuePair<string, UniValue> f in fields)
				{
					s.wString(f.Key);
					f.Value.ReadWrite(s);
				}
			}
			else
			{
				fields = new UniFields(this, c);
				for(int i = 0; i < c; i++)
				{
					string t; s.rString(out t);
					UniValue v = new UniValue(); v.ReadWrite(s);
					fields.Add(t, v);
				}
			}
		}

		// This copies properties to any other element
		public void CopyPropertiesTo(MapElement element)
		{
			//element.fields = new UniFields(this, this.fields);
			element.fields = new UniFields(element, this.fields); //mxd
		}
		
		// This must implement the call to the undo system to record the change of properties
		protected abstract void BeforePropsChange();
		
		// This is called before the custom fields change
		internal void BeforeFieldsChange()
		{
			BeforePropsChange();
		}

		//mxd. This greatly speeds up Dictionary lookups
		public override int GetHashCode()
		{
			return hashcode;
		}
		
		#endregion
	}
}