using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Net;
using System.IO;

namespace WmDataLinkMonitor {
    public partial class _default : System.Web.UI.Page {
      
        protected void Page_Load(object sender, EventArgs e) {

            string output = "<pre>" + Environment.NewLine;

            foreach (string serverAddress in WmDataLinkMonitor.ServerAddresses) {
                string shortServerName = serverAddress.Replace("http://", "").Replace("/datalink/","");

                string response = "[ERROR] Could not connect to this server";
                string healthUrl = serverAddress+"?command=LINK_HEALTH";
                try {
                    response = getInternetResponse(healthUrl, 10000);
                } catch { }

                output += shortServerName + " - " + response + Environment.NewLine;

            }

            output += "</pre>";

            Response.Write(output);
        }

        /// <summary>
        /// Makes a request and returns the response in a string.
        /// </summary>
        /// <param name="url">URL to fetch.</param>
        /// <returns></returns>
        public static string getInternetResponse(string url, int timeoutMilliSeconds) {
            // used to build entire input
            System.Text.StringBuilder sb = new System.Text.StringBuilder();

            // used on each read operation
            byte[] buf = new byte[8192];

            // prepare the web page we will be asking for
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            request.Referer = url;
            request.Timeout = timeoutMilliSeconds;
            request.UserAgent = "WmDataLinkMonitor";


            // execute the request
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();

            // we will read data via the response stream
            Stream resStream = response.GetResponseStream();

            string tempString = null;
            int count = 0;

            do {
                // fill the buffer with data
                count = resStream.Read(buf, 0, buf.Length);

                // make sure we read some data
                if (count != 0) {
                    // translate from bytes to ASCII text
                    tempString = System.Text.Encoding.ASCII.GetString(buf, 0, count);

                    // continue building the string
                    sb.Append(tempString);
                }
            }
            while (count > 0); // any more data to read?

            return sb.ToString();
        }
    }
}