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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 
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using System;
using System.Collections.Generic;
using System.Text;
using XenAdmin.Network.StorageLink;
using System.Threading;
using System.Web.Services.Protocols;
using System.Net;
using XenAPI;

namespace XenAdmin.Actions
{
    public class StorageLinkDelegatedAsyncAction : AsyncAction
    {
        private readonly Func<StorageLinkJobInfo> _jobInvoker;
        private bool _cancel;
        private readonly string _endDescription;
        private readonly string _title;
        private readonly string _startDescription;
        private StorageLinkJobInfo _jobInfo;

        public StorageLinkDelegatedAsyncAction(Func<StorageLinkJobInfo> jobInvoker, string title, string startDescription, string endDescription)
            : base(null, title, startDescription)
        {
            Util.ThrowIfParameterNull(jobInvoker, "jobInvoker");
            _jobInvoker = jobInvoker;
            _endDescription = endDescription;
            _title = title;
            _startDescription = startDescription;
        }

        public StorageLinkDelegatedAsyncAction(Func<StorageLinkJobInfo> jobInvoker)
            : base(null, "")
        {
            Util.ThrowIfParameterNull(jobInvoker, "jobInvoker");
            _jobInvoker = jobInvoker;
        }

        protected override void Run()
        {
            _jobInfo = _jobInvoker();

            while (_jobInfo != null)
            {
                if (_cancel)
                {
                    _jobInfo.StorageLinkConnection.CancelJob(_jobInfo.JobId);
                    return;
                }

                _jobInfo = _jobInfo.StorageLinkConnection.GetJobInfo(_jobInfo.JobId);

                if (_title == null)
                {
                    Title = _jobInfo.Title;
                }

                if (_startDescription == null)
                {
                    Description = _jobInfo.Description;
                }

                PercentComplete = _jobInfo.Progress;

                if (_jobInfo.State == StorageLinkEnums.JobState.Failed)
                {
                    throw new InvalidOperationException(_jobInfo.ErrorMessage);
                }

                if(_jobInfo.State == StorageLinkEnums.JobState.Cancelled || _jobInfo.State == StorageLinkEnums.JobState.Successful)
                {
                    PercentComplete = 100;
                    Description = _endDescription;
                    Thread.Sleep(2000);
                    return;
                }
            }
        }

        protected override void CancelRelatedTask()
        {
            _cancel = true;
        }

        public override void RecomputeCanCancel()
        {
            bool result = false;
            
            if (_jobInfo != null)
            {
                if (_jobInfo.State == StorageLinkEnums.JobState.Running)
                {
                    result = true;
                }
                if (_jobInfo.State == StorageLinkEnums.JobState.Queued)
                {
                    result = true;
                }
                if (_jobInfo.State == StorageLinkEnums.JobState.Pending)
                {
                    result = true;
                }
                if (_jobInfo.State == StorageLinkEnums.JobState.Created)
                {
                    result = true;
                }
            }
            CanCancel = result;
        }
    }
}