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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 NewPolicySnapshotTypePage xenTabPageSnapshotType;
        private readonly NewPolicySnapshotFrequencyPage xenTabPageSnapshotFrequency;
        private readonly NewVMGroupVMsPage<VMPP> xenTabPageVMsPage;
        private readonly NewPolicyArchivePage xenTabPageArchive;
        private readonly NewPolicyEmailPage xenTabPageEmail;
        private readonly NewPolicyFinishPage xenTabPageFinish;
        private readonly RBACWarningPage xenTabPageRBAC;

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

            xenTabPagePolicy = new NewPolicyPolicyNamePage();
            xenTabPageSnapshotType = new NewPolicySnapshotTypePage();
            xenTabPageSnapshotFrequency = new NewPolicySnapshotFrequencyPage();
            xenTabPageVMsPage = new NewVMGroupVMsPage<VMPP>();
            xenTabPageArchive = new NewPolicyArchivePage();
            xenTabPageEmail = new NewPolicyEmailPage();
            xenTabPageFinish = new NewPolicyFinishPage();
            xenTabPageRBAC = new RBACWarningPage();
            
            Pool = pool;
            xenTabPageVMsPage.Pool = pool;
            xenTabPageEmail.Pool = pool;
            xenTabPageArchive.Pool = pool;
            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 = new RBACWarningPage.WizardPermissionCheck(Messages.RBAC_WARNING_VMPP);
                check.AddApiCheck("VMPP.async_create");
                check.Blocking = true;
                xenTabPageRBAC.AddPermissionChecks(xenConnection, check);
                AddPage(xenTabPageRBAC, 0);
            }
            #endregion

            AddPages(xenTabPagePolicy, xenTabPageVMsPage, xenTabPageSnapshotType, xenTabPageSnapshotFrequency,
                     xenTabPageArchive, xenTabPageEmail, xenTabPageFinish);
        }

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

        }

        private new string GetSummary()
        {

            return string.Format(Messages.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),
                                 FormatSchedule(xenTabPageArchive.Schedule, xenTabPageArchive.ArchiveFrequency, DaysWeekCheckboxes.DaysMode.L10N_LONG));
        }

        private int GetBackupDaysCount()
        {
            string days;
            return xenTabPageSnapshotFrequency.Schedule.TryGetValue("days", out days) ? days.Split(',').Length : 0;
        }

        private static string FormatBackupType(vmpp_backup_type backupType)
        {
            if (backupType == vmpp_backup_type.snapshot)
                return Messages.DISKS_ONLY;
            else if (backupType == vmpp_backup_type.checkpoint)
                return Messages.DISKS_AND_MEMORY;
            throw new ArgumentException("wrong argument");
        }

        // These two instances of FormatSchedule used to be in the VMPP class. That's probably where
        // they really belong, but because of the way they're constructed (see DaysWeekCheckboxes.L10NDays())
        // they had to move into the View. (CA-51612).
        internal static string FormatSchedule(Dictionary<string, string> schedule, vmpp_archive_frequency archiveType, DaysWeekCheckboxes.DaysMode mode)
        {
            if (archiveType == vmpp_archive_frequency.always_after_backup)
            {
                return Messages.ASAPSNAPSHOTTAKEN;
            }
            else if (archiveType == vmpp_archive_frequency.never)
            {
                return Messages.NEVER;
            }
            else if (archiveType == vmpp_archive_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 (archiveType == vmpp_archive_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 "";

        }

        internal static string FormatSchedule(Dictionary<string, string> schedule, vmpp_backup_frequency backupFrequency, DaysWeekCheckboxes.DaysMode mode)
        {
            if (backupFrequency == vmpp_backup_frequency.hourly)
            {
                return string.Format(Messages.HOURLY_SCHEDULE_FORMAT, schedule["min"]);
            }
            else if (backupFrequency == vmpp_backup_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 == vmpp_backup_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))
            {
                xenTabPageArchive.SnapshotFrequency = xenTabPageSnapshotFrequency.Frequency;
                xenTabPageArchive.BackupDaysCount = GetBackupDaysCount();
            }
            else if (prevPageType == typeof(NewPolicyEmailPage))
            {
                xenTabPageFinish.Summary = GetSummary();
                xenTabPageFinish.SelectedVMsCount = xenTabPageVMsPage.SelectedVMs.Count;
            }
        }

        protected override void FinishWizard()
        {
            var vmpp = new VMPP
                           {
                               name_label = xenTabPagePolicy.PolicyName,
                               name_description = xenTabPagePolicy.PolicyDescription,
                               backup_type = xenTabPageSnapshotType.BackupType,
                               backup_frequency = xenTabPageSnapshotFrequency.Frequency,
                               backup_schedule = xenTabPageSnapshotFrequency.Schedule,
                               backup_retention_value = xenTabPageSnapshotFrequency.BackupRetention,
                               archive_frequency = xenTabPageArchive.ArchiveFrequency,
                               archive_target_config = xenTabPageArchive.ArchiveConfig,
                               archive_target_type = xenTabPageArchive.ArchiveTargetType,
                               archive_schedule = xenTabPageArchive.Schedule,
                               is_alarm_enabled = xenTabPageEmail.EmailEnabled,
                               alarm_config = xenTabPageEmail.EmailSettings,
                               is_policy_enabled = xenTabPageVMsPage.SelectedVMs.Count == 0 ? false : true,
                               Connection = Pool.Connection
                           };

            var action = new CreateVMPP(vmpp, xenTabPageVMsPage.SelectedVMs, xenTabPageFinish.RunNow);
            action.RunAsync();
            base.FinishWizard();
        }

        protected override string WizardPaneHelpID()
        {
            return CurrentStepTabPage is RBACWarningPage ? FormatHelpId("Rbac") : base.WizardPaneHelpID();
        }
    }
}