using System;
using Vinno.IUS.Common.IO;
using Vinno.IUS.Common.Log;
using Vinno.IUS.Common.Network.Leaf;

namespace Vinno.IUS.Common.Network.Transfer
{
    public sealed class TransferMessage:DictionaryMessage
    {
        /// <summary>
        /// Gets the token of this transfer message.
        /// </summary>
        public TransferToken Token { get; }

        /// <summary>
        /// Gets the data of this transfer message.
        /// </summary>
        public Message Data { get; }

        public TransferMessage(TransferToken token, Message data) : 
            base(SystemTags.TransferMessage)
        {
            Token = token;
            Data = data;
            var tokenIdMessage = new Message(SystemTags.TransferTokenId, new StringElement(Token.Id));
            AddMessage(tokenIdMessage);
            var dataBuffer = data.GetBuffer();
            var dataMessage = new Message(SystemTags.TransferData,new BufferElement(dataBuffer));
            AddMessage(dataMessage);
        }

        private TransferMessage(Message message) : base(message)
        {
            var tokenIdElement = GetElement<StringElement>(SystemTags.TransferTokenId);
            var tokenId = tokenIdElement.Value;
            Token = new TransferToken(tokenId);
            var dataElement = GetElement<BufferElement>(SystemTags.TransferData);
            Data = FromBuffer(dataElement.Value);
        }

        public static TransferMessage Convert(IBuffer buffer)
        {
            Message message = null;
            try
            {
                message = FromBuffer(buffer);
            }
            catch (Exception ex)
            {
                Logger.WriteLineError($"Get message from buffer failed:{ex}");
            }
            if (message != null)
            {
                if (message.Tag != SystemTags.TransferMessage)
                {
                    return null;
                }
                TransferMessage transferMessage = null;
                try
                {
                    transferMessage = new TransferMessage(message);
                }
                catch (Exception ex)
                {
                    var tagDes = message.Element == null ? "null" : message.Element.TransferType.ToString();
                    var messageDetail = message.Element?.ToString();
                    Logger.WriteLineError($"Convert TransferMessage failed:{ex},Message Element:{tagDes}, Message:{messageDetail}");
                }
                return transferMessage;
            }
            return null;
        }
    }
}