using System;
using System.Collections.Specialized;
using System.Globalization;
using System.Text;
using Telligent.Evolution.Extensibility.Api.Version1;
using Telligent.Evolution.Extensibility.UI.Version1;

namespace Telligent.Evolution.Examples
{
    public class SampleCallback : IHttpCallback, IHtmlHeaderExtension
    {
        #region IHttpCallback Members

        void IHttpCallback.ProcessRequest(System.Web.HttpContextBase httpContext)
        {
            var value = String.Empty;

            if (httpContext.Request.QueryString["value"] != null)
                value = httpContext.Request.QueryString["value"].ToString(CultureInfo.InvariantCulture);

            if (!String.IsNullOrEmpty(value))
            {
                httpContext.Response.ContentType = "text/javascript";
                httpContext.Response.Write("alert('" + PublicApi.Html.EnsureEncoded(value) + "');");
            }
            else
            {
                httpContext.Response.StatusCode = 404;
                return;
            }
        }

        IHttpCallbackController _callbackController;

        void IHttpCallback.SetController(IHttpCallbackController controller)
        {
            _callbackController = controller;
        }
        #endregion

        #region IHtmlHeaderExtension Members
        string IHtmlHeaderExtension.GetHeader(RenderTarget target)
        {
            var javascript1 = new NameValueCollection();
            javascript1["value"] = "Sample Callback Response";

            var sb = new StringBuilder();

            sb.AppendFormat(@"<script src=""{0}""></script>", _callbackController.GetUrl(javascript1));
            sb.AppendFormat(@"<script src=""{0}""></script>", _callbackController.GetUrl());

            return sb.ToString();
        }

        bool IHtmlHeaderExtension.IsCacheable
        {
            get { return true; }
        }

        bool IHtmlHeaderExtension.VaryCacheByUser
        {
            get { return false; }
        }
        #endregion

        #region IPlugin Members
        string Extensibility.Version1.IPlugin.Description
        {
            get { return "Uses an IHttpCallback to display messages in the browser console."; }
        }

        void Extensibility.Version1.IPlugin.Initialize()
        {

        }

        string Extensibility.Version1.IPlugin.Name
        {
            get { return "Sample Callback"; }
        }
        #endregion
    }
}