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using System;
using System.IO;
using System.Messaging;
using System.Text;
using Newtonsoft.Json;

public class JsonMessageFormatter : IMessageFormatter
{
    private static readonly JsonSerializerSettings DefaultSerializerSettings = 
        new JsonSerializerSettings {
                TypeNameHandling = TypeNameHandling.Objects
            };

    private readonly JsonSerializerSettings _serializerSettings;


    public Encoding Encoding { get; set; }


    public JsonMessageFormatter(Encoding encoding = null)
        : this(encoding, null)
    {
    }

    internal JsonMessageFormatter(Encoding encoding, JsonSerializerSettings serializerSettings = null)
    {
        Encoding = encoding ?? Encoding.UTF8;
        _serializerSettings = serializerSettings ?? DefaultSerializerSettings;
    }


    public bool CanRead(Message message)
    {
        if (message == null)
            throw new ArgumentNullException("message");

        var stream = message.BodyStream;

        return stream != null
            && stream.CanRead
            && stream.Length > 0;
    }

    public object Clone()
    {
        return new JsonMessageFormatter(Encoding, _serializerSettings);
    }

    public object Read(Message message)
    {
        if (message == null)
            throw new ArgumentNullException("message");

        if(CanRead(message) == false)
            return null;

        using (var reader = new StreamReader(message.BodyStream, Encoding))
        {
            var json = reader.ReadToEnd();
            return JsonConvert.DeserializeObject(json, _serializerSettings);
        }
    }

    public void Write(Message message, object obj)
    {
        if (message == null)
            throw new ArgumentNullException("message");

        if (obj == null)
            throw new ArgumentNullException("obj");

        string json = JsonConvert.SerializeObject(obj, Formatting.None, _serializerSettings);

        message.BodyStream = new MemoryStream(Encoding.GetBytes(json));

        //Need to reset the body type, in case the same message
        //is reused by some other formatter.
        message.BodyType = 0;
    }
}