using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.IO;
using System.Data;
namespace GZTW.AyaNova.BLL
{
    /// <summary>
    /// Class used to check for updates
    /// </summary>
    [Serializable]
    public class CheckForUpdate
    {
        /// <summary>
        /// Checks the AyaNova web server for available
        /// updates to the product indicated
        /// </summary>
        /// <param name="sProductName">Name of product i.e. "AyaNovaFull", "AyaNovaLite"</param>
        /// <param name="sVersion">Version to check (current version)</param>
        /// <returns>url to update page or empty string if no update available</returns>
        static public string UpdateUrl(string sProductName, string sVersion)
        {

            try
            {
                //download the update xml
                WebClient wc = new WebClient();
                Stream strm = wc.OpenRead("https://www.ayanova.com/updates/updates.xml");//case 3649
                DataSet ds = new DataSet();
                ds.ReadXml(strm);
                strm.Close();

                //find matching product and version
                foreach (DataRow dr in ds.Tables[0].Rows)
                {
                    if (dr["Product"].ToString() == sProductName && dr["Version"].ToString() == sVersion)                   
                        return dr["UpgradeInfoUrl"].ToString();                       
                    
                }

                return "";
            }
            catch (System.Net.WebException e)
            {
                return e.Message;
            }
           
        }
    }
}