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using System;
using System.Collections.Generic;
using System.Globalization;
using System.Text;
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(Messages.NEW_VMSS_PAGE_TEXT, Messages.NEW_VMSS_PAGE_TEXT_MORE,
                                                            Messages.VMSS_NAME, Messages.VMSS_NAME_TITLE, Messages.VMSS_NAME_FIELD_TEXT);
            xenTabPageSnapshotType = new NewPolicySnapshotTypePage();
            xenTabPageVMsPage = new NewVMGroupVMsPage<VMSS>();
            xenTabPageFinish = new NewPolicyFinishPage(Messages.VMSS_FINISH_PAGE_TEXT, Messages.VMSS_FINISH_PAGE_CHECKBOX_TEXT, Messages.VMSS_FINISH_TITLE);
            xenTabPageRBAC = new RBACWarningPage();
            xenTabPageVMsPage.Pool = pool;
            xenTabPageSnapshotFrequency = new NewPolicySnapshotFrequencyPage();
            xenTabPageSnapshotFrequency.Pool = pool;
            
            #region RBAC Warning Page Checks
            if (Pool.Connection.Session.IsLocalSuperuser || Helpers.GetMaster(Pool.Connection).external_auth_type == Auth.AUTH_TYPE_NONE)
            {
                //do nothing
            }
            else
            {
                RBACWarningPage.WizardPermissionCheck check;
                check = new RBACWarningPage.WizardPermissionCheck(Messages.RBAC_WARNING_VMSS);
                check.AddApiCheck("VMSS.async_create");
                check.Blocking = true;
                xenTabPageRBAC.AddPermissionChecks(xenConnection, check);
                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;
        }

        private new string GetSummary()
        {

            return string.Format(Messages.VMSS_POLICY_SUMMARY.Replace("\\n", "\n").Replace("\\r", "\r"), xenTabPagePolicy.PolicyName, CommaSeparated(xenTabPageVMsPage.SelectedVMs),
                                     FormatBackupType(xenTabPageSnapshotType.BackupType),
                                     FormatSchedule(xenTabPageSnapshotFrequency.Schedule, xenTabPageSnapshotFrequency.Frequency, DaysWeekCheckboxes.DaysMode.L10N_LONG));
        }

        private static string FormatBackupType(vmss_type backupType)
        {
            if (backupType == vmss_type.snapshot)
                return Messages.DISKS_ONLY;
            else if (backupType == vmss_type.checkpoint)
                return Messages.DISKS_AND_MEMORY;
            else if (backupType == vmss_type.snapshot_with_quiesce)
                return Messages.QUIESCED_SNAPSHOTS;

            throw new ArgumentException("wrong argument");
        }

        internal static string FormatSchedule(Dictionary<string, string> schedule, vmss_frequency backupFrequency, DaysWeekCheckboxes.DaysMode mode)
        {
            if (backupFrequency == vmss_frequency.hourly)
            {
                return string.Format(Messages.HOURLY_SCHEDULE_FORMAT, schedule["min"]);
            }
            else if (backupFrequency == vmss_frequency.daily)
            {
                DateTime value = DateTime.Parse(string.Format("{0}:{1}", schedule["hour"], schedule["min"]), CultureInfo.InvariantCulture);
                return string.Format(Messages.DAILY_SCHEDULE_FORMAT, HelpersGUI.DateTimeToString(value, Messages.DATEFORMAT_HM, true));
            }
            else if (backupFrequency == vmss_frequency.weekly)
            {
                DateTime value = DateTime.Parse(string.Format("{0}:{1}", schedule["hour"], schedule["min"]), CultureInfo.InvariantCulture);
                return string.Format(Messages.WEEKLY_SCHEDULE_FORMAT, HelpersGUI.DateTimeToString(value, Messages.DATEFORMAT_HM, true), DaysWeekCheckboxes.L10NDays(schedule["days"], mode));
            }
            return "";
        }

        private static string CommaSeparated(IEnumerable<VM> selectedVMs)
        {
            var sb = new StringBuilder();
            foreach (var selectedVM in selectedVMs)
            {
                sb.Append(selectedVM.Name());
                sb.Append(", ");
            }
            if (sb.Length > 2)
                sb.Remove(sb.Length - 2, 2);
            return sb.ToString();
        }

        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 = GetSummary();
                    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 = (vmss_type)xenTabPageSnapshotType.BackupType,
                    frequency = (vmss_frequency)xenTabPageSnapshotFrequency.Frequency,
                    schedule = xenTabPageSnapshotFrequency.Schedule,
                    retained_snapshots = xenTabPageSnapshotFrequency.BackupRetention,
                    enabled = xenTabPageVMsPage.SelectedVMs.Count == 0 ? false : true,
                    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";    
        }

                        
    }
}