using System;
using System.Collections.Generic;
using System.Text;
using System.Xml.Serialization;
using System.Xml;
using System.Xml.Schema;
using System.IO;

namespace Volian.Svg.Library
{
	public static class SvgSerializer<T> where T : class
	{
		public static string StringSerialize(T t)
		{
			string strOutput = string.Empty;
			XmlSerializer xs = new XmlSerializer(typeof(T),"http://www.w3.org/2000/svg");
			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.w3.org/2000/svg");
			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.w3.org/2000/svg");
			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.w3.org/2000/svg");
			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(); 
		} 
	}
}