namespace EnVisage.Code.ModelBinders
{
    using Newtonsoft.Json.Linq;
    using NLog;
    using System;
    using System.IO;
    using System.Web.Mvc;

    public class JsonModelBinderBase<T> : IModelBinder where T : class, new()
    {
        public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
        {
            try
            {
                // check if it is json content is passed
                if (!controllerContext.HttpContext.Request.ContentType.StartsWith("application/json", StringComparison.OrdinalIgnoreCase))
                    return null;

                var stream = controllerContext.HttpContext.Request.InputStream;
                if (stream == null)
                    return null;

                stream.Position = 0;
                using (var reader = new StreamReader(stream))
                {
                    var json = reader.ReadToEnd();
                    var modelName = bindingContext.ModelName;
                    var modelContent = JObject.Parse(json)[modelName];
                    var model = modelContent.ToObject<T>();

                    return model;
                }
            }
            catch (Exception ex)
            {
                var logger = LogManager.GetCurrentClassLogger();
	            logger?.Fatal(ex);

	            return null;
            }
        }
    }
}