using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Markup;
using System.Xml;

namespace Tango.Editors
{
    internal static class FrameworkElementCloner
    {
        /// <summary>
        /// Clones the specified element.
        /// </summary>
        /// <param name="element">The element.</param>
        /// <returns></returns>
        public static FrameworkElement Clone(FrameworkElement element)
        {
            var sb = new StringBuilder();
            var writer = XmlWriter.Create(sb, new XmlWriterSettings
            {
                Indent = true,
                ConformanceLevel = ConformanceLevel.Fragment,
                OmitXmlDeclaration = true,
                NamespaceHandling = NamespaceHandling.OmitDuplicates,
            });
            var mgr = new XamlDesignerSerializationManager(writer);

            // HERE BE MAGIC!!!
            mgr.XamlWriterMode = XamlWriterMode.Expression;
            // THERE WERE MAGIC!!!

            XamlWriter.Save(element, mgr);
            String xaml = sb.ToString();

            StringReader stringReader = new StringReader(xaml);
            XmlReader xmlReader = XmlReader.Create(stringReader);
            FrameworkElement cloned = (FrameworkElement)XamlReader.Load(xmlReader) as FrameworkElement;
            return cloned;
        }

        public static String Serialize(FrameworkElement element)
        {
            var sb = new StringBuilder();
            var writer = XmlWriter.Create(sb, new XmlWriterSettings
            {
                Indent = true,
                ConformanceLevel = ConformanceLevel.Fragment,
                OmitXmlDeclaration = true,
                NamespaceHandling = NamespaceHandling.OmitDuplicates,
            });
            var mgr = new XamlDesignerSerializationManager(writer);

            // HERE BE MAGIC!!!
            mgr.XamlWriterMode = XamlWriterMode.Expression;
            // THERE WERE MAGIC!!!

            XamlWriter.Save(element, mgr);
            String xaml = sb.ToString();

            return xaml;
        }

        public static FrameworkElement Deserialize(String xaml)
        {
            StringReader stringReader = new StringReader(xaml);
            XmlReader xmlReader = XmlReader.Create(stringReader);
            FrameworkElement cloned = (FrameworkElement)XamlReader.Load(xmlReader) as FrameworkElement;
            return cloned;
        }
    }
}