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 *     following disclaimer. 
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 *     following disclaimer in the documentation and/or other 
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 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
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using System;
using System.Linq;
using XenAdmin.Diagnostics.Problems;
using XenAdmin.Diagnostics.Problems.HostProblem;
using XenAPI;
using System.Collections.Generic;

namespace XenAdmin.Diagnostics.Checks
{
    public class SafeToUpgradeCheck : Check
    {
        private static readonly log4net.ILog log = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);

        public SafeToUpgradeCheck(Host host)
            : base(host)
        {
        }

        public override Problem RunCheck()
        {
            try
            {
                var config = new Dictionary<string, string>();
                var result = XenAPI.Host.call_plugin(Host.Connection.Session, Host.opaque_ref, "prepare_host_upgrade.py", "testSafe2Upgrade", config);

                if (result.ToLowerInvariant() != "true")
                {
                    return new HostNotSafeToUpgradeWarning(this, Host);
                }
            }
            catch (Failure failure)
            {
                //note: handle the case when we get UNKNOWN_XENAPI_PLUGIN_FUNCTION - testSafe2Upgrade
                log.WarnFormat("Plugin call prepare_host_upgrade.testSafe2Upgrade on {0} failed with {1}", Host.Name, failure.Message);
            }

            return null;
        }

        public override string Description
        {
            get { return string.Empty; }
        }
    }
}