using System;
using System.Web;
using System.Text.RegularExpressions;

namespace Elisy.Theater.Web.HttpModules
{
    public class WwwAddingModule : IHttpModule
    {
        public void Dispose()
        {
        }

        public void Init(HttpApplication context)
        {
            context.BeginRequest += new EventHandler(context_BeginRequest);
        }

        private void context_BeginRequest(object sender, EventArgs e)
        {
            HttpContext context = (sender as HttpApplication).Context;
            if (context.Request.HttpMethod != "GET" || context.Request.IsLocal)
                return;

            if (context.Request.PhysicalPath.EndsWith(".aspx", StringComparison.OrdinalIgnoreCase))
            {
                string originalUrl = context.Request.Url.ToString();
                string url = originalUrl;

                if (!url.Contains("://www."))
                {
                    url = url.Replace("://", "://www.");

                    if (url.EndsWith("Default.aspx", StringComparison.OrdinalIgnoreCase))
                        url = url.Replace("Default.aspx", string.Empty);
                }

                if (url != originalUrl)
                {
                    context.Response.Clear();
                    context.Response.StatusCode = 301;
                    context.Response.AppendHeader("location", url);
                    context.Response.End();
                }
            }
        }
    }
}