//Work continued on Allan's blogpost from 2009
//http://labs.episerver.com/en/Blogs/Allan/Dates/2009/3/Output-PageData-as-JSON/

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using EPiServer.PlugIn;
using EPiServer.Core;
using System.Text;
using EPiServer.Filters;
using EPiServer;



namespace Backstage.Classes
{
    [PagePlugIn(DisplayName="JSON Exporter", Description="Exports pages as JSON")]
    public class EPiJson
    {
        public static void Initialize(int bitflags)
        {
            EPiServer.PageBase.PageSetup += PageBase_BaseSetup;
        }

        static void PageBase_BaseSetup(EPiServer.PageBase sender, EPiServer.PageSetupEventArgs e)
        {
            sender.Load += sender_Load;
        }

        static void FilterPageDataProperties(PageData pd, Dictionary<string,string> dict) {
            
            foreach (PropertyData prop in pd.Property)
            {
                //TODO: Handle all epi types properly
                dict.Add(prop.Name, prop.ToString());
            }
        }

        static string DictToJson(Dictionary<string, string> dict)
        {
            var contents = string.Join(",", dict.Select(d => string.Format("\"{0}\" : \"{1}\"", d.Key, d.Value)));
            return String.Format("{{ {0} }}", contents);
        }

        static void sender_Load(object sender, EventArgs e)
        {
            var pb = sender as PageBase;

            //Check if json was requested
            if (!string.IsNullOrEmpty(pb.Request["json"]))
            {
                //Parse option
                var option = pb.Request["json"].ToLower();

                //Todo: switch options properly

                //Return current page as JSON
                var dict = new Dictionary<string, string>();

                FilterPageDataProperties(pb.CurrentPage, dict);

                //Convert to json
                var json = DictToJson(dict);
                                
                pb.Response.Headers.Add("Content-type", "application/json");
                pb.Response.Write(json);
                pb.Response.End();

            }
        }

    }
}