using System.Collections.Generic;
using System.Xml.Serialization;

namespace DTS.DASLib.Utility
{

    public class XmlDictionary
    {
        public SerializableDictionary<string, object> Dictionary { get; set; } = new SerializableDictionary<string, object>();
    }

    [XmlRoot("dictionary")]
    public class SerializableDictionary<TKey, TValue>

        : Dictionary<TKey, TValue>, IXmlSerializable
    {

        #region IXmlSerializable Members

        public System.Xml.Schema.XmlSchema GetSchema()
        {
            return null;
        }



        public void ReadXml(System.Xml.XmlReader reader)
        {
            var keySerializer = new XmlSerializer(typeof(TKey));
            var valueSerializer = new XmlSerializer(typeof(TValue));

            var wasEmpty = reader.IsEmptyElement;
            reader.Read();

            if (wasEmpty)
                return;
            reader.ReadStartElement("items");
            while (reader.NodeType != System.Xml.XmlNodeType.EndElement)
            {
                reader.ReadStartElement("item");

                reader.ReadStartElement("key");
                var key = (TKey)keySerializer.Deserialize(reader);
                reader.ReadEndElement();

                reader.ReadStartElement("value");
                var value = (TValue)valueSerializer.Deserialize(reader);
                reader.ReadEndElement();

                Add(key, value);

                reader.ReadEndElement();
                reader.MoveToContent();
            }
            reader.ReadEndElement();
        }

        public void WriteXml(System.Xml.XmlWriter writer)
        {
            var keySerializer = new XmlSerializer(typeof(TKey));
            var valueSerializer = new XmlSerializer(typeof(TValue));
			writer.WriteStartElement("items");
            foreach (var key in Keys)
            {
                writer.WriteStartElement("item");

                writer.WriteStartElement("key");
                keySerializer.Serialize(writer, key);
                writer.WriteEndElement();

                writer.WriteStartElement("value");
                var value = this[key];
                valueSerializer.Serialize(writer, value);
                writer.WriteEndElement();

                writer.WriteEndElement();
            }
            writer.WriteEndElement();
        }
        #endregion
    }
}