#region Copyright And Revision History

/*---------------------------------------------------------------------------

	EditDataTypes.cs
	Copyright © 2002 Bill Menees.  All rights reserved.
	Bill@Menees.com

	Who		When		What
	-------	----------	-----------------------------------------------------
	BMenees	10.20.2002	Created.

-----------------------------------------------------------------------------*/

#endregion

using System;
using System.Collections.ObjectModel;
using System.Collections.Generic;
using System.Diagnostics;

namespace Menees.DiffUtils
{
	public enum EditType { None = 0, Delete = 1, Insert = 2, Change = 3 };

	[DebuggerDisplay("Type = {Type}, StartA = {StartA}, StartB = {StartB}, Length = {Length}")]
	public class Edit
	{
		#region Private Data Members

		private EditType m_eType;
		private int m_iStartA;	//Where to Delete, Insert, or Change in the "A" sequence
		private int m_iStartB;	//Where to Insert or Change in the "B" sequence
		private int m_iLength;

		#endregion

		#region Protected Properties

		public EditType Type { get { return m_eType; } }
		public int StartA { get { return m_iStartA; } }
		public int StartB { get { return m_iStartB; } }
		public int Length { get { return m_iLength; } }

		#endregion

		#region Constructors

		internal Edit(EditType eType, int iStartA, int iStartB, int iLength)
		{
			m_eType = eType;
			m_iStartA = iStartA;
			m_iStartB = iStartB;
			m_iLength = iLength;
		}

		#endregion
	}

	public class EditScript : ReadOnlyCollection<Edit>
	{
		#region Constructors

		internal EditScript()
			: base(new List<Edit>())
		{
		}

		#endregion

		#region Internal Methods

		internal void Add(Edit E)
		{
			if (E.Type == EditType.Change)
				m_iLength += 2*E.Length;
			else
				m_iLength += E.Length;

			Items.Add(E);
		}

		#endregion

		#region Public Properties

		public int TotalEditLength
		{
			get
			{
				return m_iLength;
			}
		}

		#endregion

		#region Private Data Members

		private int m_iLength = 0;

		#endregion
	}
}