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using System.Collections.Generic;
using System.Linq;
using XenAdmin.Core;
using XenAdmin.Diagnostics.Checks;
using XenAdmin.Wizards.PatchingWizard;
using XenAdmin.Wizards.PatchingWizard.PlanActions;
using XenAdmin.Wizards.RollingUpgradeWizard.PlanActions;
using XenAPI;

namespace XenAdmin.Wizards.RollingUpgradeWizard
{
    public partial class RollingUpgradeUpgradePage : AutomatedUpdatesBasePage
    {
        public RollingUpgradeUpgradePage()
        {
            InitializeComponent();
        }

        #region XenTabPage overrides
        public override string PageTitle { get { return Messages.UPGRADE_PLAN; } }

        public override string Text { get { return Messages.UPGRADE_PLAN; } }

        public override string HelpID { get { return "Upgradepools"; } }
        #endregion

        #region Accessors
        public bool ManualModeSelected { private get; set; }
        public Dictionary<string, string> InstallMethodConfig { private get; set; }
        #endregion

        #region AutomatedUpdatesBesePage overrides

        protected override string BlurbText()
        {
            return Messages.ROLLING_UPGRADE_UPGRADE_IN_PROGRESS;
        }

        protected override string SuccessMessageOnCompletion(bool multiplePools)
        {
            return multiplePools ? Messages.ROLLING_UPGRADE_SUCCESS_MANY : Messages.ROLLING_UPGRADE_SUCCESS_ONE;
        }

        protected override string FailureMessageOnCompletion(bool multiplePools)
        {
            return multiplePools ? Messages.ROLLING_UPGRADE_ERROR_MANY : Messages.ROLLING_UPGRADE_ERROR_ONE;
        }

        protected override string SuccessMessagePerPool()
        {
            return Messages.ROLLING_UPGRADE_SUCCESS_ONE;
        }

        protected override string FailureMessagePerPool(bool multipleErrors)
        {
            return multipleErrors ? Messages.ROLLING_UPGRADE_ERROR_POOL_MANY : Messages.ROLLING_UPGRADE_ERROR_POOL_ONE;
        }

        protected override string UserCancellationMessage()
        {
            return Messages.ROLLING_UPGRADE_CANCELLATION;
        }

        protected override void GeneratePlanActions(Pool pool, List<HostPlan> planActions, List<PlanAction> finalActions)
        {
            //Add masters first, then the slaves that are not ugpraded
            var hostNeedUpgrade = pool.HostsToUpgrade();
            
            foreach (var host in hostNeedUpgrade)
            {
                planActions.Add(GetSubTasksFor(host));
            }

            //add a revert pre-check action for this pool
            var problemsToRevert = ProblemsResolvedPreCheck.Where(p =>
            {
                var hostCheck = p.Check as HostCheck;
                if (hostCheck != null)
                    return hostNeedUpgrade.Select(h => h.uuid).Contains(hostCheck.Host.uuid);
                return false;
            }).ToList();
            if (problemsToRevert.Count > 0)
                finalActions.Add(new UnwindProblemsAction(problemsToRevert, pool.Connection));
        }

        protected override bool SkipInitialPlanActions(Host host)
        {
            //Skip hosts already upgraded
            if (host.IsMaster())
            {
                var pool = Helpers.GetPoolOfOne(host.Connection);
                if (pool != null && pool.IsMasterUpgraded())
                {
                    log.Debug(string.Format("Skipping master '{0}' because it is upgraded", host.Name()));
                    return true;
                }
            }
            else
            {
                var master = Helpers.GetMaster(host.Connection);
                if (master != null && host.LongProductVersion() == master.LongProductVersion())
                {
                    log.Debug(string.Format("Skipping host '{0}' because it is upgraded", host.Name()));
                    return true;
                }
            }
            return false;
        }

        private Dictionary<UpdateProgressBackgroundWorker, List<XenServerPatch>> AllUploadedPatches = new Dictionary<UpdateProgressBackgroundWorker, List<XenServerPatch>>(); 
        private Dictionary<UpdateProgressBackgroundWorker, List<XenServerPatch>> MinimalPatches = new Dictionary<UpdateProgressBackgroundWorker, List<XenServerPatch>>(); // should be calculated only once per pool (to ensure update homogeneity)

        protected override void DoAfterInitialPlanActions(UpdateProgressBackgroundWorker bgw, Host host, List<Host> hosts)
        {
            var theHostPlan = bgw.HostPlans.FirstOrDefault(ha => ha.Host.Equals(host));
            if (theHostPlan == null)
                return;

            if (theHostPlan.UpdatesPlanActions.Count > 0) // this is a retry; do not recreate actions
                return; 

            host = host.Connection.TryResolveWithTimeout(new XenRef<Host>(host.opaque_ref));

            if (!ApplyUpdatesToNewVersion || host.Connection.Cache.Hosts.Any(Host.RestrictBatchHotfixApply))
                return;
            
            if (!MinimalPatches.ContainsKey(bgw))
                MinimalPatches.Add(bgw, Updates.GetMinimalPatches(host));

            var minimalPatches = MinimalPatches[bgw];
            
            if (minimalPatches == null)
                return;

            if (!AllUploadedPatches.ContainsKey(bgw))
                AllUploadedPatches.Add(bgw, new List<XenServerPatch>());
            var uploadedPatches = AllUploadedPatches[bgw];

            var hp = GetUpdatePlanActionsForHost(host, hosts, minimalPatches, uploadedPatches, new KeyValuePair<XenServerPatch, string>(), false);
            if (hp.UpdatesPlanActions != null && hp.UpdatesPlanActions.Count > 0)
            {
                theHostPlan.UpdatesPlanActions.AddRange(hp.UpdatesPlanActions);
                theHostPlan.DelayedPlanActions.InsertRange(0, hp.DelayedPlanActions);
            }
        }
        #endregion

        #region Private methods
        private HostPlan GetSubTasksFor(Host host)
        {
            var runningVMs = host.GetRunningVMs();

            UpgradeHostPlanAction upgradeAction;
            if (ManualModeSelected)
                upgradeAction = new UpgradeManualHostPlanAction(host, this);
            else
                upgradeAction = new UpgradeAutomatedHostPlanAction(host, this, InstallMethodConfig);

            var initialPlanActions = new List<PlanAction>()
            {
                new EvacuateHostPlanAction(host),
                upgradeAction,
                new BringBabiesBackAction(runningVMs, host, true)
            };

            return new HostPlan(host, initialPlanActions, null, new List<PlanAction>());
        }

        #endregion
    }
}