<%@ WebHandler Language="C#" Class="Medianamik.Sitemap.SitemapHandler" %>

using System;
using System.Web;
using System.Linq;
using Medianamik.Core;
using System.Text;
using System.Xml;
using System.Collections.Generic;
using Medianamik.Core.Urls;

namespace Medianamik.Sitemap
{
    public class SitemapHandler: IHttpHandler
    {
        public void ProcessRequest (HttpContext context)
        {
            HttpContext.Current.Response.ContentType = "text/xml";

            XmlTextWriter siteMap = new XmlTextWriter(HttpContext.Current.Response.OutputStream, System.Text.Encoding.UTF8);
            siteMap.Formatting = Formatting.Indented;
            siteMap.WriteStartDocument();
            siteMap.WriteStartElement("urlset");
            siteMap.WriteAttributeString("xmlns", "http://www.sitemaps.org/schemas/sitemap/0.9");
            siteMap.WriteAttributeString("xmlns:xsi", "http://www.w3.org/2001/XMLSchema-instance");
            siteMap.WriteAttributeString("xsi:schemaLocation", "http://www.sitemaps.org/schemas/sitemap/0.9 http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd");

            var urlDictionary = new ObjectFactory<IUrlDictionary>().Get();
            
            var authority = context.Request.Url.GetLeftPart(UriPartial.Authority).ToString();
            
            urlDictionary
                .GetAllEntries(IndexationModes.Indexed)
                .Where(u => u.Generation > -1)
                .Select(url => url.RequestedUrl.ToString())
                .Where(url => url.StartsWith(authority, StringComparison.OrdinalIgnoreCase))
                .Distinct().ForEach(url =>
                {
                    siteMap.WriteStartElement("url");
                    siteMap.WriteElementString("loc", url.ToString());
                    siteMap.WriteEndElement();
                });

            siteMap.WriteEndElement();
            siteMap.Close();
        }

        public bool IsReusable {
            get {return false;}
        }
    }
}