using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;

namespace Xnlab.SQLMon.Diff
{
	public class TextLine : IComparable
	{
		public string Line;
		public int Hash;

		public TextLine(string str)
		{
			Line = str.Replace("\t"," ");
			Hash = str.GetHashCode();
		}
		#region IComparable Members

		public int CompareTo(object obj)
		{
			return Hash.CompareTo(((TextLine)obj).Hash);
		}

		#endregion
	}


	public class DiffListText : IDiffList
	{
		private const int MaxLineLength = 1024;
		private readonly List<TextLine> _lines;

		public DiffListText(string source, bool isFile)
		{
 _lines = new List<TextLine>();
 if (isFile)
 {
 using (var sr = new StreamReader(source))
 {
 String line;
 // Read and display lines from the file until the end of 
 // the file is reached.
 while ((line = sr.ReadLine()) != null)
 {
 if (line.Length > MaxLineLength)
 {
 throw new InvalidOperationException(
 string.Format("File contains a line greater than {0} characters.",
 MaxLineLength.ToString()));
 }
 _lines.Add(new TextLine(line));
 }
 }
 }
 else
 {
 source.Split(new string[] { "\r\n" }, StringSplitOptions.None).ToList().ForEach(l => _lines.Add(new TextLine(l)));
 }
		}
		#region IDiffList Members

		public int Count()
		{
			return _lines.Count;
		}

		public IComparable GetByIndex(int index)
		{
			return (TextLine)_lines[index];
		}

		#endregion
	
	}
}