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 * that the following conditions are met: 
 * 
 * *   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 XenAdmin.Actions;
using XenAdmin.Core;
using XenAPI;
using System.Linq;
using System.IO;
using XenAdmin.Network;

namespace XenAdmin.Wizards.PatchingWizard.PlanActions
{
    class DownloadPatchPlanAction : PlanActionWithSession
    {
        private readonly XenServerPatch patch;
        private Dictionary<XenServerPatch, string> AllDownloadedPatches = new Dictionary<XenServerPatch, string>();
        private KeyValuePair<XenServerPatch, string> patchFromDisk;
        private string tempFileName = null;

        public DownloadPatchPlanAction(IXenConnection connection, XenServerPatch patch, Dictionary<XenServerPatch, string> allDownloadedPatches, KeyValuePair<XenServerPatch, string> patchFromDisk)
            : base(connection)
        {
            this.patch = patch;
            this.AllDownloadedPatches = allDownloadedPatches;
            this.patchFromDisk = patchFromDisk;
        }

        protected override void RunWithSession(ref Session session)
        {
            lock (patch)
            {
                if (Cancelling)
                    return;

                //skip the download if the patch has been already downloaded or we are using a patch from disk
                if ((AllDownloadedPatches.ContainsKey(patch) && File.Exists(AllDownloadedPatches[patch])) 
                    || (patchFromDisk.Key == patch && File.Exists(patchFromDisk.Value)))
                {
                    AddProgressStep(string.Format(Messages.PATCHINGWIZARD_DOWNLOADUPDATE_ACTION_TITLE_SKIPPING, patch.Name));
                }
                else
                {
                    DownloadFile(ref session);
                }
            }
        }

        private void DownloadFile(ref Session session)
        {
            string patchUri = patch.PatchUrl;
            if (string.IsNullOrEmpty(patchUri))
                return;

            Uri address = new Uri(patchUri);
            tempFileName = Path.GetTempFileName();

            var exts = Helpers.ElyOrGreater(Connection) ? Branding.UpdateIso : Branding.Update;
            var downloadAction = new DownloadAndUnzipXenServerPatchAction(patch.Name, address, tempFileName, true, exts);

            downloadAction.Changed += downloadAndUnzipXenServerPatchAction_Changed;
            downloadAction.Completed += downloadAndUnzipXenServerPatchAction_Completed;

            AddProgressStep(string.Format(Messages.PATCHINGWIZARD_DOWNLOADUPDATE_ACTION_TITLE_WAITING, patch.Name));
            downloadAction.RunExternal(session);
        }

        private void downloadAndUnzipXenServerPatchAction_Changed(ActionBase sender)
        {
            var downloadAction = sender as DownloadAndUnzipXenServerPatchAction;
            if (downloadAction == null)
                return;

            if (Cancelling)
                downloadAction.Cancel();

            if (!string.IsNullOrEmpty(downloadAction.DownloadProgressDescription))
                ReplaceProgressStep(downloadAction.DownloadProgressDescription);
        }


        private void downloadAndUnzipXenServerPatchAction_Completed(ActionBase sender)
        {
            var action = sender as DownloadAndUnzipXenServerPatchAction;
            if (action == null)
                return;

            action.Changed -= downloadAndUnzipXenServerPatchAction_Changed;
            action.Completed -= downloadAndUnzipXenServerPatchAction_Completed;

            if (action.Succeeded)
                AllDownloadedPatches[patch] = action.PatchPath;
        }
    }
}