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 *     following disclaimer. 
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using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Threading;
using XenAdmin.Actions;
using XenAdmin.Controls;
using XenAdmin.Core;
using XenAdmin.Dialogs;
using System.Windows.Forms;

namespace XenAdmin.Wizards.RollingUpgradeWizard
{
    public enum RollingUpgradeStatus { NotStarted, Started, Cancelled, Completed }

    public partial class RollingUpgradeWizard : XenWizardBase
    {
        private readonly RollingUpgradeUpgradePage RollingUpgradeUpgradePage;
        private readonly RollingUpgradeWizardSelectPool RollingUpgradeWizardSelectPool;
        private readonly RollingUpgradeWizardPrecheckPage RollingUpgradeWizardPrecheckPage;
        private readonly RollingUpgradeWizardFirstPage RollingUpgradeWizardFirstPage;
        private readonly RollingUpgradeWizardInstallMethodPage RollingUpgradeWizardInstallMethodPage;
        private readonly RollingUpgradeWizardUpgradeModePage RollingUpgradeWizardUpgradeModePage;
        private readonly RollingUpgradeReadyToUpgradePage RollingUpgradeReadyToUpgradePage;

        public RollingUpgradeWizard()
        {
            InitializeComponent();

            RollingUpgradeUpgradePage = new RollingUpgradeUpgradePage();
            RollingUpgradeWizardSelectPool = new RollingUpgradeWizardSelectPool();
            RollingUpgradeWizardPrecheckPage = new RollingUpgradeWizardPrecheckPage();
            RollingUpgradeWizardFirstPage = new RollingUpgradeWizardFirstPage();
            RollingUpgradeWizardInstallMethodPage = new RollingUpgradeWizardInstallMethodPage();
            RollingUpgradeWizardUpgradeModePage = new RollingUpgradeWizardUpgradeModePage();
            RollingUpgradeReadyToUpgradePage = new RollingUpgradeReadyToUpgradePage();

            AddPage(RollingUpgradeWizardFirstPage);
            AddPage(RollingUpgradeWizardSelectPool);
            AddPage(RollingUpgradeWizardUpgradeModePage);
            AddPage(RollingUpgradeWizardPrecheckPage);
            //Here has to be inserted the installer location page if automatic
            AddPage(RollingUpgradeReadyToUpgradePage);
            AddPage(RollingUpgradeUpgradePage);
        }

        protected override void FinishWizard()
        {
            var brokenSRs = RollingUpgradeWizardSelectPool.SelectedMasters
                .Where(Helpers.BostonOrGreater)
                .Any(master => master != null && master.Connection.Cache.SRs.Any(sr => sr.IsBroken(true)));
            if(brokenSRs)
            {
                new ThreeButtonDialog(
                    new ThreeButtonDialog.Details(SystemIcons.Warning,
                        Messages.BROKEN_SRS_AFTER_UPGRADE))
                        .ShowDialog(Program.MainWindow);
            }
            base.FinishWizard();
        }

        protected override void UpdateWizardContent(XenTabPage senderPage)
        {
            var prevPageType = senderPage.GetType();

            if (prevPageType == typeof(RollingUpgradeWizardSelectPool))
            {
                var selectedMasters = RollingUpgradeWizardSelectPool.SelectedMasters;
                RollingUpgradeWizardPrecheckPage.SelectedMasters = selectedMasters;
                RollingUpgradeWizardInstallMethodPage.SelectedMasters = selectedMasters;
                RollingUpgradeReadyToUpgradePage.SelectedMasters = selectedMasters;
                RollingUpgradeUpgradePage.SelectedMasters = selectedMasters;
            }
            else if (prevPageType == typeof(RollingUpgradeWizardUpgradeModePage))
            {
                var manualModeSelected = RollingUpgradeWizardUpgradeModePage.ManualModeSelected;
                
                RemovePageAt(4);
                if (manualModeSelected)
                    AddPage(RollingUpgradeReadyToUpgradePage, 4);
                else
                    AddPage(RollingUpgradeWizardInstallMethodPage, 4);

                RollingUpgradeWizardPrecheckPage.ManualModeSelected = manualModeSelected;
                RollingUpgradeUpgradePage.ManualModeSelected = manualModeSelected;
            }
            else if (prevPageType == typeof(RollingUpgradeWizardInstallMethodPage))
                RollingUpgradeUpgradePage.InstallMethodConfig = RollingUpgradeWizardInstallMethodPage.InstallMethodConfig;
            else if (prevPageType == typeof(RollingUpgradeWizardPrecheckPage))
                RollingUpgradeUpgradePage.ProblemsResolvedPreCheck = RollingUpgradeWizardPrecheckPage.ProblemsResolvedPreCheck;
        }

        protected override void OnShown(System.EventArgs e)
        {
            base.OnShown(e);

            if (Properties.Settings.Default.RollingUpgradeWizardShowFirstPage)
                NextStep();
        }

        private List<AsyncAction> GetUnwindChangesActions()
        {
            if (RollingUpgradeWizardPrecheckPage.ProblemsResolvedPreCheck == null)
                return null;

            var actionList = (from problem in RollingUpgradeWizardPrecheckPage.ProblemsResolvedPreCheck
                              where problem.SolutionActionCompleted
                              select problem.UnwindChanges());

            return actionList.Where(action => action != null &&
                                              action.Connection != null &&
                                              action.Connection.IsConnected).ToList();
        }

        private void RevertResolvedPreChecks()
        {
            List<AsyncAction> subActions = GetUnwindChangesActions();
            if (subActions.Count > 0)
            {
                using (MultipleAction multipleAction = new MultipleAction(xenConnection, Messages.REVERT_WIZARD_CHANGES,
                                                                          Messages.REVERTING_WIZARD_CHANGES,
                                                                          Messages.REVERTED_WIZARD_CHANGES,
                                                                          subActions, false, true))
                {
                    ActionProgressDialog dialog = new ActionProgressDialog(multipleAction, ProgressBarStyle.Blocks);
                    dialog.ShowDialog(Program.MainWindow);
                }
            }
        }

        protected override void OnCancel()
        {
            if (RollingUpgradeUpgradePage.UpgradeStatus == RollingUpgradeStatus.NotStarted)
                RevertResolvedPreChecks();

            base.OnCancel();
        }

        private void ShowCanBeResumedInfo()
        {
            using (var dialog = new ThreeButtonDialog(new ThreeButtonDialog.Details(SystemIcons.Information,
                                                                Messages.ROLLING_UPGRADE_CAN_RESUME_UPGRADE,
                                                                Messages.ROLLING_POOL_UPGRADE)))
            {
                dialog.ShowDialog(Program.MainWindow);
            }
        }

        protected override void OnClosed(System.EventArgs e)
        {
            base.OnClosed(e);

            if (RollingUpgradeUpgradePage.UpgradeStatus == RollingUpgradeStatus.Cancelled)
                ThreadPool.QueueUserWorkItem(o => Program.Invoke(Program.MainWindow, ShowCanBeResumedInfo));
        }
    }
}