using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml.Serialization;
using System.Runtime.Serialization;
using System.Xml;
using System.Xml.Schema;
using System.Reflection;
using Aitex.Core.RT.Log;

namespace Aitex.Core.Util
{
    /// <summary>
    /// Serializable dictionary
    /// </summary>
    /// <typeparam name="KT"></typeparam>
    /// <typeparam name="VT"></typeparam>
    [Serializable]
    public class SerializableDictionary<TKey, TValue>
           : Dictionary<TKey, TValue>, IXmlSerializable
    {
        public SerializableDictionary()
            : base()
        {
        }
        public SerializableDictionary(IDictionary<TKey, TValue> dictionary)
            : base(dictionary)
        {
        }
        public SerializableDictionary(IEqualityComparer<TKey> comparer)
            : base(comparer)
        {
        }
        public SerializableDictionary(int capacity)
            : base(capacity)
        {
        }
        public SerializableDictionary(int capacity, IEqualityComparer<TKey> comparer)
            : base(capacity, comparer)
        {
        }
        protected SerializableDictionary(SerializationInfo info, StreamingContext context)
            : base(info, context)
        {
        }
        /// <summary>
        /// return null
        /// </summary>
        /// <returns></returns>
        public XmlSchema GetSchema()
        {
            return null;
        }

        /// <summary>
        /// Deserialize
        /// </summary>
        /// <param name="reader"></param>
        public void ReadXml(XmlReader reader)
        {
            XmlSerializer keySerializer = new XmlSerializer(typeof(TKey));
            XmlSerializer valueSerializer = new XmlSerializer(typeof(TValue));
            if (reader.IsEmptyElement || !reader.Read())
            {
                return;
            }
            while (reader.NodeType != XmlNodeType.EndElement)
            {
                reader.ReadStartElement("item");
                reader.ReadStartElement("key");
                TKey key = (TKey)keySerializer.Deserialize(reader);
                reader.ReadEndElement();
                reader.ReadStartElement("value");
                TValue value = (TValue)valueSerializer.Deserialize(reader);
                reader.ReadEndElement();
                reader.ReadEndElement();
                reader.MoveToContent();
                this.Add(key, value);
            }
            reader.ReadEndElement();
        }

        /// <summary>
        /// Serialize
        /// </summary>
        /// <param name="writer"></param>
        public void WriteXml(XmlWriter writer)
        {
            try
            {
                XmlSerializer keySerializer = new XmlSerializer(typeof(TKey));
                XmlSerializer valueSerializer = new XmlSerializer(typeof(TValue));

                foreach (TKey key in this.Keys)
                {
                    writer.WriteStartElement("item");
                    writer.WriteStartElement("key");
                    keySerializer.Serialize(writer, key);
                    writer.WriteEndElement();
                    writer.WriteStartElement("value");
                    valueSerializer.Serialize(writer, this[key]);
                    writer.WriteEndElement();
                    writer.WriteEndElement();
                }
            }
            catch (Exception ex)
            {
                LOG.Write(ex); 
            }
        }
    }
}