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 * All rights reserved. 
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 * with or without modification, are permitted provided 
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 * 
 * *   Redistributions of source code must retain the above 
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 *     following disclaimer. 
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 *     copyright notice, this list of conditions and the 
 *     following disclaimer in the documentation and/or other 
 *     materials provided with the distribution. 
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 
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 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
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using System;
using System.IO;
using System.Xml;
using XenAdmin.Actions;

namespace CFUValidator.Updates
{
    class ReadFromFileUpdatesXmlSource : DownloadUpdatesXmlAction, ICheckForUpdatesXMLSource
    {
        private readonly string _location;

        public ReadFromFileUpdatesXmlSource(string location)
            : base(true, true, true, "CFU")
        {
            _location = location ?? throw new ArgumentNullException(nameof(location));
        }

        protected override XmlDocument FetchCheckForUpdatesXml()
        {
            if (!File.Exists(_location))
            {
                ErrorRaised = new CFUValidationException("File not found at: " + _location);
                throw ErrorRaised;
            }
                 
            try
            {
                XmlDocument xdoc = new XmlDocument();
                using (StreamReader sr = new StreamReader(_location))
                    xdoc.Load(sr);
                return xdoc;
            }
            catch(Exception)
            {
                ErrorRaised = new CFUValidationException("Could not read/parse file: " + _location);
                throw ErrorRaised;
            }
            
        }

        public Exception ErrorRaised { get; private set; }
    }
}
