using System;
using System.Collections.Generic;
using System.Text;
using System.Xml;
using System.Xml.Serialization;
using System.Xml.Schema;
using System.IO;
using VEPROMS.CSLA.Library;

namespace DataLoader
{
	[XmlRoot("DataLoaderGlitches")]
	//[Serializable()]
	public class DataLoaderGlitches
	{
		private Glitches _Glitches;

		public Glitches Glitches
		{
			get 
			{
				if (_Glitches == null) _Glitches = new Glitches();
				return _Glitches; 
			}
			set {	_Glitches = value; }
		}
		public void Add(string cause, string originalText, string newText)
		{
			Glitches.Add(cause, originalText, newText);
		}
		public void Save(string fileName)
		{
			XmlSerializer<DataLoaderGlitches>.WriteFile(this, fileName);
		}
		public static DataLoaderGlitches LoadProblems(string fileName)
		{
			return XmlSerializer<DataLoaderGlitches>.ReadFile(fileName);
		}
	}
	public class Glitches : List<Glitch>
	{
		public void Add(string cause, string originalText, string newText)
		{
			base.Add(new Glitch(cause, originalText, newText));
		}
	}
	public class Glitch
	{
		public Glitch()
		{
		}
		public Glitch(string cause, string originalText, string newText)
		{
			_Cause = cause;
			_OriginalText = originalText;
			_NewText = newText;
		}
		private string _Cause;
		[XmlAttribute("Cause")]
		public string Cause
		{
			get { return _Cause; }
			set { _Cause = value; }
		}
		private string _OriginalText;
		[XmlAttribute("OriginalText")]
		public string OriginalText
		{
			get { return _OriginalText; }
			set { _OriginalText = value; }
		}
		private string _NewText;
		[XmlAttribute("NewText")]
		public string NewText
		{
			get { return _NewText; }
			set { _NewText = value; }
		}
		private string _Comparison;
		[XmlIgnore]
		public string Comparison
		{
			get 
			{
				if (_Comparison == null)
					_Comparison = GetComparison(_OriginalText, _NewText);
				return _Comparison; 
			}
		}
		private string GetComparison(string str1, string str2)
		{
			if(str1 == str2)return str1;
			int endMatch = 0;
			int l1 = str1.Length;
			int l2 = str2.Length;
			int min = l1 > l2 ? l2 : l1;
			int startMatch = min;
			for(int i = 0; i< min; i++)
				if (str1[i] != str2[i])
				{
					startMatch = i;
					break;
				}
			for (int i = 1; i < min; i++)
				if (str1[l1-i] != str2[l2-i])
				{
					endMatch = i-1;
					break;
				}
			string prefix = str1.Substring(0, startMatch);
			string part1 = str1.Substring(startMatch, l1 - (startMatch + endMatch));
			string part2 = str2.Substring(startMatch, l2 - (startMatch + endMatch));
			string suffix = str1.Substring(l1 - endMatch, endMatch);
			_Delta = "<<<" + part1 + "|||" + part2 + ">>>";
			return prefix + "\r\n<<<" + part1 + "|||" + part2 + ">>>\r\n" + suffix;
		}
		private string _Delta = null;
		public override string ToString()
		{
			if (Comparison == null) { ;} // This gets the Comparsion and sets _Delta
			return _Delta;
		}
	}
	public static class XmlSerializer<T> where T : class
	{
		public static string StringSerialize(T t)
		{
			string strOutput = string.Empty;
			XmlSerializer xs = new XmlSerializer(typeof(T), "http://www.volian.com");
			using (MemoryStream ms = new MemoryStream())
			{
				xs.Serialize(new NonXsiTextWriter(ms, Encoding.UTF8), t);
				//xs.Serialize(ms, t);
				ms.Position = 0;
				StreamReader sr = new StreamReader(ms);
				strOutput = sr.ReadToEnd();
				ms.Close();
			}
			return strOutput;
		}
		public static T StringDeserialize(string s)
		{
			T t;
			XmlSerializer xs = new XmlSerializer(typeof(T), "http://www.volian.com");
			UTF8Encoding enc = new UTF8Encoding();
			Byte[] arrBytData = enc.GetBytes(s);
			using (MemoryStream ms = new MemoryStream(arrBytData))
			{
				t = (T)xs.Deserialize(ms);
			}
			return t;
		}
		public static void WriteFile(T t, string fileName)
		{
			string strOutput = string.Empty;
			XmlSerializer xs = new XmlSerializer(typeof(T), "http://www.volian.com");
			using (FileStream fs = new FileStream(fileName, FileMode.Create))
			{
				xs.Serialize(new NonXsiTextWriter(fs, Encoding.UTF8), t);
				fs.Close();
			}
		}
		public static T ReadFile(string fileName)
		{
			T t;
			XmlSerializer xs = new XmlSerializer(typeof(T), "http://www.volian.com");
			using (FileStream fs = new FileStream(fileName, FileMode.Open))
			{
				t = (T)xs.Deserialize(fs);
			}
			return t;
		}
	}
	public class NonXsiTextWriter : XmlTextWriter
	{
		public NonXsiTextWriter(TextWriter w) : base(w) { }
		public NonXsiTextWriter(Stream w, Encoding encoding)
			: base(w, encoding)
		{
			this.Formatting = Formatting.Indented;
		}
		public NonXsiTextWriter(string filename, Encoding encoding) : base(filename, encoding) { }
		bool _skip = false;
		public override void WriteStartAttribute(string prefix, string localName, string ns)
		{
			if ((prefix == "xmlns" && (localName == "xsd" || localName == "xsi")) || // Omits XSD and XSI declarations. 
				ns == XmlSchema.InstanceNamespace) // Omits all XSI attributes. 
			{
				_skip = true;
				return;
			}
			if (localName == "xlink_href")
				base.WriteStartAttribute(prefix, "xlink:href", ns);
			else
				base.WriteStartAttribute(prefix, localName, ns);
		}
		public override void WriteString(string text)
		{
			if (_skip) return;
			base.WriteString(text);
		}
		public override void WriteEndAttribute()
		{
			if (_skip)
			{ // Reset the flag, so we keep writing. 
				_skip = false;
				return;
			}
			base.WriteEndAttribute();
		}
	}

}