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 *     following disclaimer. 
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 *     following disclaimer in the documentation and/or other 
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 * 
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 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
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using System.Collections.Generic;
using System.Windows.Forms;
using XenAdmin.Actions;
using XenAdmin.Controls;
using XenAdmin.Dialogs;
using XenAPI;
using System.Linq;

namespace XenAdmin.Wizards.PatchingWizard
{
    /// <summary>
    /// Remember that equals for patches dont work across connections because 
    /// we are not allow to override equals. YOU SHOULD NOT USE ANY OPERATION THAT IMPLIES CALL EQUALS OF Pool_path or Host_patch
    /// You should do it manually or use delegates.
    /// </summary>
    public partial class PatchingWizard : XenWizardBase
    {
        private readonly PatchingWizard_PatchingPage PatchingWizard_PatchingPage;
        private readonly PatchingWizard_SelectPatchPage PatchingWizard_SelectPatchPage;
        private readonly PatchingWizard_ModePage PatchingWizard_ModePage;
        private readonly PatchingWizard_SelectServers PatchingWizard_SelectServers;
        private readonly PatchingWizard_PrecheckPage PatchingWizard_PrecheckPage;
        private readonly PatchingWizard_FirstPage PatchingWizard_FirstPage;

        public PatchingWizard()
        {
            InitializeComponent();

            PatchingWizard_PatchingPage = new PatchingWizard_PatchingPage();
            PatchingWizard_SelectPatchPage = new PatchingWizard_SelectPatchPage();
            PatchingWizard_ModePage = new PatchingWizard_ModePage();
            PatchingWizard_SelectServers = new PatchingWizard_SelectServers();
            PatchingWizard_PrecheckPage = new PatchingWizard_PrecheckPage();
            PatchingWizard_FirstPage = new PatchingWizard_FirstPage();

            AddPage(PatchingWizard_FirstPage);
            AddPage(PatchingWizard_SelectPatchPage);
            AddPage(PatchingWizard_SelectServers);
            // This gets enabled/disabled in the select patch step depending on if it is an OEM patch or not
            AddPage(PatchingWizard_PrecheckPage);
            AddPage(PatchingWizard_ModePage);
            AddPage(PatchingWizard_PatchingPage);
        }

        public void AddFile(string path)
        {
            PatchingWizard_SelectPatchPage.AddFile(path);
        }

        public void SelectServers(List<Host> selectedServers)
        {
            PatchingWizard_SelectServers.SelectServers(selectedServers);
        }

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

            if (prevPageType == typeof(PatchingWizard_SelectPatchPage))
            {
                var updateType = PatchingWizard_SelectPatchPage.SelectedUpdateType;
                var newPatch = PatchingWizard_SelectPatchPage.SelectedNewPatch;
                var existPatch = PatchingWizard_SelectPatchPage.SelectedExistingPatch;

                DisablePage(PatchingWizard_PrecheckPage, updateType == UpdateType.NewOem);

                PatchingWizard_SelectServers.SelectedUpdateType = updateType;
                PatchingWizard_SelectServers.SelectedExistingPatch = existPatch;
                PatchingWizard_SelectServers.SelectedNewPatch = newPatch;

                if (updateType == UpdateType.Existing)
                {
                    PatchingWizard_ModePage.Patch = existPatch;

                    PatchingWizard_PrecheckPage.Patch = existPatch;
                    PatchingWizard_PatchingPage.Patch = existPatch;
                }

                PatchingWizard_PrecheckPage.SelectedUpdateType = updateType;
                
                PatchingWizard_ModePage.SelectedUpdateType = updateType;

                PatchingWizard_PatchingPage.SelectedUpdateType = updateType;
                PatchingWizard_PatchingPage.SelectedNewPatch = newPatch;
            }
            else if (prevPageType == typeof(PatchingWizard_SelectServers))
            {
                var selectedServers = PatchingWizard_SelectServers.SelectedServers;

                if (PatchingWizard_SelectPatchPage.SelectedUpdateType == UpdateType.NewRetail)
                {
                    PatchingWizard_SelectPatchPage.SelectedUpdateType = UpdateType.Existing;
                    PatchingWizard_SelectPatchPage.SelectedExistingPatch = PatchingWizard_SelectServers.Patch;

                    PatchingWizard_SelectServers.SelectedUpdateType = UpdateType.Existing;
                    PatchingWizard_SelectServers.SelectedExistingPatch = PatchingWizard_SelectServers.Patch;
                    PatchingWizard_SelectServers.SelectedNewPatch = null;

                    PatchingWizard_PrecheckPage.Patch = PatchingWizard_SelectServers.Patch;

                    PatchingWizard_ModePage.Patch = PatchingWizard_SelectServers.Patch;

                    PatchingWizard_PatchingPage.Patch = PatchingWizard_SelectServers.Patch;
                }
                
                PatchingWizard_PrecheckPage.SelectedServers = selectedServers;
                PatchingWizard_PrecheckPage.NewUploadedPatches = PatchingWizard_SelectServers.NewUploadedPatches;

                PatchingWizard_ModePage.SelectedServers = selectedServers;

                PatchingWizard_PatchingPage.SelectedMasters = PatchingWizard_SelectServers.SelectedMasters;
                PatchingWizard_PatchingPage.SelectedServers = selectedServers;
                PatchingWizard_PatchingPage.SelectedPools = PatchingWizard_SelectServers.SelectedPools;
            }
            else if (prevPageType == typeof(PatchingWizard_ModePage))
            {
                PatchingWizard_PatchingPage.ManualTextInstructions = PatchingWizard_ModePage.ManualTextInstructions;
                PatchingWizard_PatchingPage.IsAutomaticMode = PatchingWizard_ModePage.IsAutomaticMode;
            }
            else if (prevPageType == typeof(PatchingWizard_PrecheckPage))
            {
                PatchingWizard_PatchingPage.ProblemsResolvedPreCheck = PatchingWizard_PrecheckPage.ProblemsResolvedPreCheck;
            }
        }

        private delegate List<AsyncAction> GetActionsDelegate();

        private List<AsyncAction> BuildSubActions(params GetActionsDelegate[] getActionsDelegate)
        {
            List<AsyncAction> result = new List<AsyncAction>();
            foreach (GetActionsDelegate getActionDelegate in getActionsDelegate)
            {
                var list = getActionDelegate();
                if (list != null && list.Count > 0)
                    result.AddRange(list);
            }
            return result;
        }

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

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

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

        private List<AsyncAction> GetRemovePatchActions(List<Pool_patch> patchesToRemove)
        {
            if (patchesToRemove == null)
                return null;

            var list = (from patch in patchesToRemove
                        where patch.Connection != null && patch.Connection.IsConnected
                        select new RemovePatchAction(patch));

            return list.OfType<AsyncAction>().ToList();
        }

        private List<AsyncAction> GetRemovePatchActions()
        {
            return GetRemovePatchActions(PatchingWizard_SelectServers.NewUploadedPatches);
        }

        private void RunMultipleActions(string title, string startDescription, string endDescription,
            List<AsyncAction> subActions)
        {
            if (subActions.Count > 0)
            {
                using (MultipleAction multipleAction = new MultipleAction(xenConnection, title, startDescription,
                                                                          endDescription, subActions, true))
                {
                    ActionProgressDialog dialog = new ActionProgressDialog(multipleAction, ProgressBarStyle.Blocks);
                    dialog.ShowDialog(Program.MainWindow);
                }
            }
        }

        protected override void OnCancel()
        {
            List<AsyncAction> subActions = BuildSubActions(GetUnwindChangesActions, GetRemovePatchActions);
            RunMultipleActions(Messages.REVERT_WIZARD_CHANGES, Messages.REVERTING_WIZARD_CHANGES,
                               Messages.REVERTED_WIZARD_CHANGES, subActions);

            base.OnCancel();
        }

        private void RemoveUnwantedPatches(List<Pool_patch> patchesToRemove)
        {
            List<AsyncAction> subActions = GetRemovePatchActions(patchesToRemove);
            RunMultipleActions(Messages.REMOVE_UPDATES, Messages.REMOVING_UPDATES, Messages.REMOVED_UPDATES, subActions);
        }

        protected override void FinishWizard()
        {
            if (PatchingWizard_SelectServers.NewUploadedPatches != null)
            {
                List<Pool_patch> patchesToRemove =
                    PatchingWizard_SelectServers.NewUploadedPatches.Where(
                        patch => patch.uuid != PatchingWizard_SelectServers.Patch.uuid).ToList();

                RemoveUnwantedPatches(patchesToRemove);
            }

            base.FinishWizard();
        }
    }
}