using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Xml.Linq;
using System.Xml.Serialization;

namespace Asb.Base.V2;

public static class SerializationExtensions
{
	private static readonly Dictionary<Type, XmlSerializer> xmlSerializers = new Dictionary<Type, XmlSerializer>();

	private static readonly object serializersLock = new object();

	public static string ToXml(this object value)
	{
		string xmlText = string.Empty;
		if (value != null)
		{
			try
			{
				using TextWriter textWriter = new StringWriter(CultureInfo.CurrentCulture);
				lock (serializersLock)
				{
					XmlSerializer typeSerializer = GetTypeSerializer(value.GetType());
					if (typeSerializer != null)
					{
						typeSerializer.Serialize(textWriter, value);
						xmlText = textWriter.ToString();
					}
				}
			}
			catch
			{
			}
		}
		return NormalizeXmlText(xmlText);
	}

	private static XmlSerializer GetTypeSerializer(Type objectType)
	{
		XmlSerializer xmlSerializer = null;
		if (objectType != null)
		{
			lock (serializersLock)
			{
				if (!xmlSerializers.ContainsKey(objectType))
				{
					string defaultNamespace = "urn:invensys.schemas";
					object[] customAttributes = objectType.GetCustomAttributes(inherit: true);
					for (int i = 0; i < customAttributes.Length; i++)
					{
						if (customAttributes[i] is XmlRootAttribute xmlRootAttribute)
						{
							defaultNamespace = xmlRootAttribute.Namespace;
							break;
						}
					}
					xmlSerializer = new XmlSerializer(objectType, defaultNamespace);
					xmlSerializers.Add(objectType, xmlSerializer);
				}
				else
				{
					xmlSerializer = xmlSerializers[objectType];
				}
			}
		}
		return xmlSerializer;
	}

	private static string NormalizeXmlText(string xmlText)
	{
		if (string.IsNullOrEmpty(xmlText))
		{
			return xmlText;
		}
		if (Environment.Is64BitProcess)
		{
			using StringReader textReader = new StringReader(xmlText);
			using IEnumerator<XElement> enumerator = XDocument.Load(textReader).Elements().GetEnumerator();
			if (enumerator.MoveNext())
			{
				XElement current = enumerator.Current;
				XAttribute xAttribute = current.Attribute(XNamespace.Xmlns + "xsd");
				XAttribute xAttribute2 = current.Attribute(XNamespace.Xmlns + "xsi");
				if (xAttribute != null && xAttribute2 != null)
				{
					current.ReplaceAttributes(xAttribute2, xAttribute);
				}
				using TextWriter textWriter = new StringWriter(CultureInfo.CurrentCulture);
				current.Save(textWriter);
				xmlText = textWriter.ToString();
			}
		}
		return xmlText;
	}
}