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using System.Collections.Generic;
using System.Linq;
using XenAdmin.Actions;
using XenAdmin.Controls;
using XenAdmin.Core;
using XenAPI;
using XenAdmin.Wizards.GenericPages;

namespace XenAdmin.Wizards.NewPolicyWizard
{
    public partial class NewPolicyWizard : XenWizardBase
    {
        private readonly NewPolicyPolicyNamePage xenTabPagePolicy;
        private readonly NewVMGroupVMsPage<VMSS> xenTabPageVMsPage;
        private readonly NewPolicySnapshotTypePage xenTabPageSnapshotType;
        private readonly NewPolicySnapshotFrequencyPage xenTabPageSnapshotFrequency;
        private readonly NewPolicyFinishPage xenTabPageFinish;
        private readonly RBACWarningPage xenTabPageRBAC; 

        public readonly Pool Pool;

        public NewPolicyWizard(Pool pool)
            : base(pool.Connection)
        {
            InitializeComponent();
            Pool = pool;

            this.Text = Messages.VMSS_WIZARD_TITLE;

            xenTabPagePolicy = new NewPolicyPolicyNamePage();
            xenTabPageSnapshotType = new NewPolicySnapshotTypePage();
            xenTabPageVMsPage = new NewVMGroupVMsPage<VMSS>();
            xenTabPageFinish = new NewPolicyFinishPage();
            xenTabPageRBAC = new RBACWarningPage();
            xenTabPageVMsPage.Pool = pool;
            xenTabPageSnapshotFrequency = new NewPolicySnapshotFrequencyPage();
            xenTabPageSnapshotFrequency.Connection = pool.Connection;
            
            #region RBAC Warning Page Checks

            if (Helpers.ConnectionRequiresRbac(Pool.Connection))
            {
                xenTabPageRBAC.SetPermissionChecks(xenConnection,
                    new WizardRbacCheck(Messages.RBAC_WARNING_VMSS, "VMSS.async_create") {Blocking = true});
                AddPage(xenTabPageRBAC, 0);
            }

            #endregion

            AddPages(xenTabPagePolicy, xenTabPageVMsPage);
            AddPage(xenTabPageSnapshotType);
            AddPages(xenTabPageSnapshotFrequency);
            AddPages(xenTabPageFinish);
        }

        public NewPolicyWizard(Pool pool, List<VM> selection)
            : this(pool)
        {
            this.xenTabPageVMsPage.SelectedVMs = selection;
        }

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

            if (prevPageType == typeof(NewPolicyPolicyNamePage))
            {
                xenTabPageVMsPage.GroupName = xenTabPagePolicy.PolicyName;
            }
            else
            {
                if (prevPageType == typeof(NewPolicySnapshotFrequencyPage))
                {
                    xenTabPageFinish.Summary = string.Format(Messages.VMSS_POLICY_SUMMARY,
                        xenTabPagePolicy.PolicyName,
                        string.Join(", ", xenTabPageVMsPage.SelectedVMs.Select(vm => vm.Name())),
                        xenTabPageSnapshotType.BackupTypeToString,
                        xenTabPageSnapshotFrequency.FormattedSchedule);
                    xenTabPageFinish.SelectedVMsCount = xenTabPageVMsPage.SelectedVMs.Count;
                }
                else if (prevPageType == typeof(NewVMGroupVMsPage<VMSS>))
                {
                    xenTabPageSnapshotType.SelectedVMs = xenTabPageVMsPage.SelectedVMs;
                }
            }
        }

        protected override void FinishWizard()
        {
             var vmss = new VMSS
                {
                    name_label = xenTabPagePolicy.PolicyName,
                    name_description = xenTabPagePolicy.PolicyDescription,
                    type = xenTabPageSnapshotType.BackupType,
                    frequency = xenTabPageSnapshotFrequency.Frequency,
                    schedule = xenTabPageSnapshotFrequency.Schedule,
                    retained_snapshots = xenTabPageSnapshotFrequency.BackupRetention,
                    enabled = xenTabPageVMsPage.SelectedVMs.Count != 0,
                    Connection = Pool.Connection
                };

            var action = new CreateVMPolicy(vmss, xenTabPageVMsPage.SelectedVMs, xenTabPageFinish.RunNow);

            action.RunAsync();
            base.FinishWizard();
        }

        protected override string WizardPaneHelpID()
        {
            if (CurrentStepTabPage is RBACWarningPage)
            {
                return FormatHelpId("Rbac");
            }

            return "NewPolicyWizardVMSS_" + CurrentStepTabPage.HelpID + "Pane";    
        }
    }
}