using System;
using System.Web.Mvc;
using Neo.Afx.ComponentModel;

namespace Neo.Afx.Mvc
{
    /// <summary>
    /// A JSON result extension.
    /// </summary>
    public class JsonResultEx : JsonResult
    {
        readonly private JsonSerializerOptions _options;

        /// <summary>
        /// Initializes a new instance of the <see cref="JsonResultEx"/> class.
        /// </summary>
        public JsonResultEx() :
            this(JsonSerializerOptions.All)
        {
        }

        /// <summary>
        /// Initializes a new instance of the <see cref="JsonResultEx"/> class.
        /// </summary>
        /// <param name="options">The serialization options.</param>
        public JsonResultEx(JsonSerializerOptions options)
        {
            _options = options;
            JsonRequestBehavior = JsonRequestBehavior.DenyGet;

        }

        /// <summary>
        /// Enables processing of the result of an action method by a custom type that inherits from the <see cref="T:System.Web.Mvc.ActionResult"/> class.
        /// </summary>
        /// <param name="context">The context within which the result is executed.</param>
        /// <exception cref="T:System.ArgumentNullException">The <paramref name="context"/> parameter is null.</exception>
        public override void ExecuteResult(ControllerContext context)
        {
            if(context == null)
            {
                throw new ArgumentNullException("context");
            }
            if((JsonRequestBehavior == JsonRequestBehavior.DenyGet) && string.Equals(context.HttpContext.Request.HttpMethod, "GET", StringComparison.OrdinalIgnoreCase))
            {
                throw new InvalidOperationException("MvcResources.JsonRequest_GetNotAllowed");
            }
            var response = context.HttpContext.Response;
            response.ContentType = !string.IsNullOrEmpty(ContentType) ? ContentType : "application/json";
            if(ContentEncoding != null)
            {
                response.ContentEncoding = ContentEncoding;
            }
            if(Data != null)
            {
                response.Write(Data.ToJson(_options));
            }
        }
    }
}