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using System;
using System.Collections.Generic;
using System.Text;
using XenAdmin.Alerts;
using XenAPI;
using System.Diagnostics;
using System.Linq;
using XenAdmin.Core;
using XenAdmin.Network;

namespace XenAdmin.Actions
{
    public class LoadVmssAction : PureAsyncAction
    {
        private static readonly log4net.ILog log = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);

        public LoadVmssAction(IXenConnection connection)
            : base(connection, "", true)
        {
            ServerLocalTime = null;
            SnapshotSchedules = new Dictionary<VMSS, List<Message>>();
        }

        public DateTime? ServerLocalTime { get; private set; }

        public Dictionary<VMSS, List<XenAPI.Message>> SnapshotSchedules { get; private set; }

        protected override void Run()
        {
            try
            {
                ServerLocalTime = Host.get_server_localtime(Connection.Session, Helpers.GetMaster(Connection).opaque_ref);
            }
            catch (Exception e)
            {
                log.Error("An error occurred while obtaining VMPP date time: ", e);
                ServerLocalTime = null;
            }

            var schedules = Connection.Cache.VMSSs;
            var messages = Pool.Connection.Cache.Messages;

            var allVmssMessages = (from XenAPI.Message msg in messages
                    where msg.cls == cls.VMSS
                    group msg by msg.obj_uuid
                    into g
                    let gOrdered = g.OrderByDescending(m => m.timestamp).ToList()
                    select new {PolicyUuid = g.Key, PolicyMessages = gOrdered})
                .ToDictionary(x => x.PolicyUuid, x => x.PolicyMessages);

            var filteredVmssMessages = new Dictionary<VMSS, List<XenAPI.Message>>();
            foreach (var schedule in schedules)
            {
                List<XenAPI.Message> value;
                if (!allVmssMessages.TryGetValue(schedule.uuid, out value))
                    value = new List<XenAPI.Message>();

                filteredVmssMessages[schedule] = value;
            }
            
            SnapshotSchedules = filteredVmssMessages;
        }
    }
}
