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 * All rights reserved. 
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 * Redistribution and use in source and binary forms, 
 * with or without modification, are permitted provided 
 * that the following conditions are met: 
 * 
 * *   Redistributions of source code must retain the above 
 *     copyright notice, this list of conditions and the 
 *     following disclaimer. 
 * *   Redistributions in binary form must reproduce the above 
 *     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 
 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, 
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 
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 */

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

namespace XenAdmin.Actions
{
    public class GetVMSSAlertsAction : PureAsyncAction
    {
        public readonly VMSS VMSS;
        private int _hoursFromNow;
        public GetVMSSAlertsAction(VMSS vmss, int hoursfromNow)
            : base(vmss.Connection, "", true)
        {
            VMSS = vmss;
            _hoursFromNow = hoursfromNow;
        }

        protected override void Run()
        {
            var now = DateTime.Now;
 	    var messages = Pool.Connection.Cache.Messages.OrderByDescending(message => message.timestamp).ToList();
            var listAlerts = new List<PolicyAlert>();
 	    DateTime currentTime = DateTime.Now;
            DateTime offset = currentTime.Add(new TimeSpan(- _hoursFromNow, 0, 0));
          
            /* _hoursFromNow has 3 possible values:
                1) 0 -> top 10 messages
                2) 24 -> messages from past 24 Hrs
                3) 7 * 24 -> messages from lst 7 days */

            if (_hoursFromNow == 0)
            {
                int messageCounter = 0;
                foreach (var message in messages)
                {
                    if (message.cls == cls.VMSS && message.obj_uuid == VMSS.uuid && messageCounter < 10)
                    {
                        listAlerts.Add(new PolicyAlert(message.priority, message.name, message.timestamp, message.body, VMSS.Name));
                        messageCounter++;
                    }
                    else if (messageCounter >= 10)
                        break;
                }
            } 
            else
            {
                foreach (var message in messages)
                {
                    if (message.cls == cls.VMSS && message.obj_uuid == VMSS.uuid && message.timestamp > offset)
                    {
                        listAlerts.Add(new PolicyAlert(message.priority, message.name, message.timestamp, message.body, VMSS.Name));
                    }

                    /* since the messages are sorted on timestamp you need not scan the entire message list */

                    else if (message.timestamp < offset)
                        break;
                }
	    }

            VMSS.Alerts = new List<PolicyAlert>(listAlerts);
            Debug.WriteLine(string.Format("GetAlerts took: {0}", DateTime.Now - now));
        }

 
    }
}