using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Web.Mvc;
using BeWo.View.Navigation.Filter;
using BeWoPlanerMobil.Service;
using BeWoPlanerMobil.Util;
using BS.Shared;
using BS.Shared.DataContracts;
using BS.Shared.DataContracts.Compact;
using BS.Shared.Extensions;
using BS.Shared.Settings;

namespace BeWoPlanerMobil.Models
{
	public class MainModel : AbstractModel
    {
        public long? SelectedCostBearerSupportConceptRelOid { get; set; }

        [Display(Name = "Nur meine Klienten anzeigen")]
        public bool ShowOnlyOwnSupportConcepts { get; set; }

        [Display(Name = "Nur Klienten meiner Teams anzeigen")]
        public bool ShowOnlyMyTeamsSupportConcepts { get; set; }
        
        public CustomerFilterEnum SelectedSupportConceptFilter { get; set; }

        public List<SelectListItem> SupportConceptFilter
        {
            get
            {
                /*
                 * Hat man das Recht "Hilfepläne ansehen (alle)":
                 *      "Alle Hiflepläne anzeigen" und
                 *      "Nur meine Hilfepläne anzeigen".
                 *
                 * Hat man die Rechte "Hilfepläne ansehen (alle)" und "Hilepläne ansehen (von Teams betreut)":
                 *      "Alle Hiflepläne anzeigen",
                 *      "Nur Hilfepläne meiner Teams anzeigen" und
                 *      "Nur meine Hilfepläne anzeigen".
                 *
                 * Hat man das Recht "Hilepläne ansehen (von Mitarbeiter betreut):
                 *      ENTFÄLLT -> nur die eigenen Hilfepläne
                 *
                 * Hat man die Rechte "Hilfepläne ansehen (von Mitarbeiter betreut)" und "Hilfepläne ansehen (von Teams betreut)":
                 *      "Nur meine Hilfepläne anzeigen"
                 *      "Nur Hilfepläne meiner Teams anzeigen"
                 */

                var result = new List<SelectListItem>();

                var user = MobileSessionFacade.LoggedInUser;

                var alle = new CustomerFilterItem(CustomerFilterEnum.All);
                var nurMeine = new CustomerFilterItem(CustomerFilterEnum.MyCustomer);
                var meinesTeams = new CustomerFilterItem(CustomerFilterEnum.TeamCustomer);

                var allSupportConcepts         = alle.CustomerFilterName;
                var mySupportConceptsOnly      = nurMeine.CustomerFilterName;
                var myTeamsSupportConceptsOnly = meinesTeams.CustomerFilterName;

                const string allSupportConceptsValue         = "0";
                const string mySupportConceptsValue          = "1";
                const string myTeamsSupportConceptsOnlyValue = "2";

                if(user != null)
                {
                    if(user.CheckForAtLeastOneRight(new List<UserRightType> { UserRightType.ViewAll, UserRightType.SupportConcept_ViewAllSupportConcepts }))
                    {
                        if(user.CheckForRight(UserRightType.SupportConcept_ViewMyTeams))
                        {
                            result.Add(new SelectListItem { Text = allSupportConcepts,         Value = allSupportConceptsValue });
                            result.Add(new SelectListItem { Text = myTeamsSupportConceptsOnly, Value = myTeamsSupportConceptsOnlyValue });
                            result.Add(new SelectListItem { Text = mySupportConceptsOnly,      Value = mySupportConceptsValue });
                        }
                        else
                        {
                            result.Add(new SelectListItem { Text = allSupportConcepts,    Value = allSupportConceptsValue });
                            result.Add(new SelectListItem { Text = mySupportConceptsOnly, Value = mySupportConceptsValue });
                        }
                    }
                    else if(user.CheckForRight(UserRightType.SupportConcept_ViewMyTeams))
                    {
                        result.Add(new SelectListItem { Text = myTeamsSupportConceptsOnly,  Value = myTeamsSupportConceptsOnlyValue });
                        result.Add(new SelectListItem { Text = mySupportConceptsOnly,       Value = mySupportConceptsValue });
                    }
                }

                return result;
            }
        }

        [Display(Name = "Abgelaufene Hilfepläne anzeigen")]
        public bool ShowExpiredSupportConcepts { get; set; }

		[Display(Name = "Hilfeplan")]
		public long? CostBearer2SupportConceptOid { get; set; }

        public long? SelectedServiceCategoryOid => SelectedServiceCategory?.ServiceCategoryOid;

        public long? SelectedServiceDescriptionOid => SelectedServiceDescription?.ServiceDescriptionOid;

		public long? SelectedServiceRecordOid { get; set; }

        public static bool IsAllowedToDeleteServiceRecord(ServiceRecordDC serviceRecord)
        {
            var allowed = false;

            if(MobileSessionFacade.CheckForUserRight(UserRightType.ServiceRecordView_Delete))
            {
                allowed = true;
            }
            else if(MobileSessionFacade.CheckForUserRight(UserRightType.ServiceRecord_AllowChangeWithin24Hours))
            {
                if(serviceRecord.InsertedOn.HasValue)
                {
                    if(DateTime.Now < serviceRecord.InsertedOn.Value.AddDays(ApplicationSettings.ServiceRecordAllowChangeHours))
                    {
                        allowed = true;
                    }
                }
            }

            if(allowed && ApplicationSettings.MaxDaysEditServiceRecordsAllowed > 0)
            {
                if(!MobileSessionFacade.CheckForUserRight(UserRightType.ServiceRecord_AllowEditAfterMaxDaysInNextMonth))
                {
                    if(serviceRecord.Start.HasValue)
                    {
                        var dateTime = new DateTime(serviceRecord.Start.Value.Year, serviceRecord.Start.Value.Month, 1);
                        dateTime = dateTime.AddMonths(1);
                        dateTime = dateTime.AddDays(ApplicationSettings.MaxDaysEditServiceRecordsAllowed);

                        if(DateTime.Now >= dateTime)
                        {
                            allowed = false;
                        }
                    }
                }
            }

            if (allowed && ApplicationSettings.AnzTageZeiterfassErfolgt > 0)
            {
                if (!MobileSessionFacade.CheckForUserRight(UserRightType.ServiceRecordAllowEditAfterMindays))
                {
                    if (serviceRecord.Start != null)
                    {
                        var dt = new DateTime(serviceRecord.Start.Value.Year, serviceRecord.Start.Value.Month, serviceRecord.Start.Value.Day);
                        dt = dt.AddDays(ApplicationSettings.AnzTageZeiterfassErfolgt + 1);
                        if (DateTime.Now >= dt)
                        {
                            allowed = false;
                        }
                    }
                }
            }

            if(allowed && !MobileSessionFacade.CheckForUserRight(UserRightType.ServiceRecord_AllowEditForOtherEmployees))
            {
                if(MobileSessionFacade.LoggedInEmployee.EmployeeOid != serviceRecord.Employee.EmployeeOid)
                {
                    allowed = false;
                }
            }

            if(allowed && serviceRecord.GroupOid.HasValue)
            {
                if(!MobileSessionFacade.CheckForUserRight(UserRightType.ServiceRecord_AllowCreatingGroupBooking))
                {
                    allowed = false;
                }
            }

            return allowed;
        }

        public ServiceRecordDC SelectedServiceRecord { get; set; }
	    
		public SupportConceptDC SelectedSupportConcept { get; set; }

		public int Zeitraum { get; set; }

        public int ErrorWert { get; set; }

        public bool ShowSignature { get; set; }

        public long ServiceRecordOid { get; set; }

		public List<SupportConceptDC> SupportConcepts { get; set; }

        public List<TextModuleDC> Textbausteine { get; set; } = new List<TextModuleDC>();

        public List<TextbausteinDisplayItem> TextModules { get; set; } = new List<TextbausteinDisplayItem>();

		private List<ServiceRecordDC> _ServiceRecords;

		public List<ServiceRecordDC> ServiceRecords
		{
			get
			{
				if(_ServiceRecords == null)
				{
				    return _ServiceRecords = new List<ServiceRecordDC>();
				}

				return _ServiceRecords.OrderByDescending(sr => sr.Start).ToList();
			}
			set => _ServiceRecords = value;
		}

        private List<ValueListEntryDC> _SelectedGoals;

        public List<ValueListEntryDC> SelectedGoals
        {
            get => _SelectedGoals ?? new List<ValueListEntryDC>();

            set => _SelectedGoals = value;
        }

        private string GetRatingName(ValueListEntryDC ratedValueListEntry)
        {
            var rating = GoalRatingTypes.FirstOrDefault(f => f.RatingTypeOid.HasValue && f.RatingTypeOid.Value.Equals(ratedValueListEntry.RatingTypeOid));

            return rating?.DisplayName ?? "NULL";
        }

        public ServiceRecordDC NewServiceRecord { get; set; }

		public long? ServiceRecordOidToDelete { get; set; }

        public bool ShowDistanceField { get; set; }

	    public MainModel()
		{
			NewServiceRecord           = new ServiceRecordDC();
		    ShowOnlyOwnSupportConcepts = true;
            ErrorWert                  = 1;
		}

        public IEnumerable<CostBearer2SupportConceptRelListObject> SupportConceptListObjects
        {
            get
            {
                var allCostBearerRelations = new List<CostBearer2SupportConceptRelListObject> {new CostBearer2SupportConceptRelListObject("Hilfeplan auswählen", "", "-1", false, false), new CostBearer2SupportConceptRelListObject("Ohne Hilfeplan", "", "-2", false, false) };
                foreach(var sc in SupportConcepts.OrderBy(sc => sc.Customer.LastName))
                {
                    allCostBearerRelations.AddRange(sc.CostBearerRelations.Where(w => ShowExpiredSupportConcepts || w.EndDate is null || w.EndDate.Value >= DateTime.Now.Date).Select(
                        cb => new CostBearer2SupportConceptRelListObject(
                            $"{sc.Customer.SimpleDescription} {(sc.Customer.DateOfBirth.HasValue ? "*" + sc.Customer.DateOfBirth.Value.ToString("dd.MM.yyyy") : string.Empty)}", 
                            $"{cb.AuswahlBezeichnung} {cb.StartDate?.ToShortDateString().Remove(6, 2) ?? string.Empty}-{cb.EndDate?.ToShortDateString().Remove(6, 2) ?? string.Empty} {cb.CostBearer.Name}{GetIsNotApproved(cb)}", 
                            cb.CostBearer2SupportConceptOid.ToString(), 
                            cb.SupportConcept.IsAboutToExpire,
                            cb.SupportConcept.ExpiresIn3MonthOrLess))
                    );
                }
                return allCostBearerRelations;
            }
        }

        

        public CostBearer2SupportConceptRelListObject SelectedCostBearer2SupportConceptRelListObject { get; set; }

        public List<SupportConceptCostBearerRelDC> SelectedConceptCostBearerRelations { get; set; }

        public GroupBookingSelectionObject GroupBookingSelectionObject => new GroupBookingSelectionObject(SelectedConceptCostBearerRelations, GroupBookingSelectedGroupOfPeopleOids);

        public IEnumerable<CostBearer2SupportConceptRelListObject> SupportConceptListObjectsForGroupBooking
        {
            get
            {
                var allCostbearerRelations = new List<CostBearer2SupportConceptRelListObject>();

                foreach(var sc in SupportConcepts.OrderBy(sc => sc.Customer.LastName))
                {
                    allCostbearerRelations.AddRange(sc.CostBearerRelations.Where(w => ShowExpiredSupportConcepts || w.EndDate is null || w.EndDate.Value >= DateTime.Now).Select(
                        cb => new CostBearer2SupportConceptRelListObject(
                            $"{sc.Customer.SimpleDescription} {(sc.Customer.DateOfBirth.HasValue ? "*" + sc.Customer.DateOfBirth.Value.ToString("dd.MM.yyyy") : string.Empty)}", 
                            $"{cb.AuswahlBezeichnung} {cb.StartDate?.ToShortDateString().Remove(6, 2) ?? string.Empty}-{cb.EndDate?.ToShortDateString().Remove(6, 2) ?? string.Empty} {cb.CostBearer.Name}", 
                            cb.CostBearer2SupportConceptOid.ToString(), 
                            cb.SupportConcept.IsAboutToExpire, 
                            cb.SupportConcept.ExpiresIn3MonthOrLess))
                    );
                }

                return allCostbearerRelations;
            }
        }

	    public IEnumerable<SelectListItem> GroupOfPeopleListItems
	    {
	        get
	        {
	            return GroupsOfPeople.Select(group => new SelectListItem {Value = $"{group.GroupOfPeopleOid.Value}", Text = group.Name}).ToList();
	        }
	    }

		public List<CompactEmployeeDC> Employees { get; set; }

        public List<CompactEmployeeDC> EmployeesForGroupAndMultiBooking { get; set; }

		public List<CompactEmployeeDC> AllEmployees { get; set; }

		[Display(Name = "Mitarbeiter")]
		public long? SelectedEmployeeOid => SelectedEmployee?.EmployeeOid;

	    public CompactEmployeeDC SelectedEmployee { get; set; }

	    public List<GroupOfPeopleDC> GroupsOfPeople { get; set; } = new List<GroupOfPeopleDC>();

        public List<long> GroupBookingSelectedGroupOfPeopleOids { get; set; } = new List<long>();

		public IEnumerable<SelectListItem> EmployeeListItems
		{
			get
			{
				var result = new List<SelectListItem>();
				result.AddRange(Employees.Select(item => new SelectListItem {Value = item.EmployeeOid.ToString(), Text = $"{item.LastName}, {item.FirstName}", Selected = item.Equals(MobileSessionFacade.LoggedInCompactEmployee)}).OrderBy(s => s.Text).ToList());
				
				return result;
			}
		}

        public ValueListEntryDC[] Dokutypes { get; set; }

        public int NumberOfDokuTypes => Dokutypes?.Length ?? 0;

        public static DateTime? GetEndDateOfSupportConcept(SupportConceptDC pSupportConcept)
	    {
            DateTime? maxDate = null;

	        foreach(var relation in pSupportConcept.CostBearerRelations)
	        {
	            var end = relation.ApprovedEndDate ?? relation.RequestedEndDate;
	            
                if(maxDate == null || end != null && end.Value > maxDate.Value)
	            {
	                maxDate = end;
	            }
	        }

	        return maxDate;
        }

	    public List<SupportConceptDC> GroupBookingSelectedSupportConcepts { get; set; } = new List<SupportConceptDC>();

	    public List<long> GroupBookingSelectedCostbearerRelOids { get; set; } = new List<long>();

	    public List<CompactEmployeeDC> GroupBookingSelectedEmployees { get; set; } = new List<CompactEmployeeDC>();

	    [Display(Name = "Gruppenbuchung")]
	    public bool IsInGroupBookingMode
	    {
            get => _IsInGroupBookingMode;

            set
	        {
	            _IsInGroupBookingMode = value;
	            
	            if(!_IsInGroupBookingMode)
	            {
	                GroupBookingSelectedSupportConcepts?.Clear();
	                GroupBookingSelectedEmployees?.Clear();
	            }
            }
	    }

	    private bool _IsInGroupBookingMode;

        

	    public bool IsInEditingMode { get; set; }
	    
	    public List<ServiceDescriptionDC> GetServiceDesctiptions()
	    {
	        var result = new List<ServiceDescriptionDC>();

            foreach(var category2Descriptions in Categories2Descriptions)
            {
                result.AddRangeIfElementsNotIn(category2Descriptions.Value);
            }
            
	        return result;
	    }

	    public bool IsServiceRecordNoticeMandatory { get; set; } = true;

        public CompactEmployeeDC PreviouslySelectedEmployee { get; set; }
        public SupportConceptDC PreviouslySelectedSupportConcept { get; set; }
        public long? PreviouslySelectedCostbearer2SupportConceptOid { get; set; }
        public bool IsEndDateVisible { get; set; }

        public static string GetServiceRecordTimeHeader(ServiceRecordDC serviceRecord, bool isForServiceRecordsList)
        {
            if (serviceRecord?.Start is null || serviceRecord.End is null)
            {
                return string.Empty;
            }

            var start = serviceRecord.Start.Value;
            var end = serviceRecord.End.Value;
            var gruppenInfo = string.Empty;
            var signatureToken = serviceRecord.SignatureOid.HasValue && isForServiceRecordsList ? "✔" : string.Empty;

            if(serviceRecord.GroupOid.HasValue)
            {
                gruppenInfo = $"Gruppe ({serviceRecord.GroupPersonCount} Teilnehmer, {serviceRecord.GroupEmployeeCount} Betreuer) Dauer: {(end - start).TotalMinutes}  {signatureToken}";
            }

            return $"{GetServiceRecordTimeString(serviceRecord)} {gruppenInfo} {signatureToken}";
        }

        public static string GetServiceRecordTimeString(ServiceRecordDC serviceRecord)
        {
            if(serviceRecord?.Start is null || serviceRecord.End is null)
            {
                return string.Empty;
            }

            var start = serviceRecord.Start.Value;
            var end = serviceRecord.End.Value; //start.AddMinutes((int) serviceRecord.RoundedDuration), AB, 12.03.2025: Änderung vom 12.11.2024 rückgängig; Endzeit bleibt bei Gruppen- und Einzelbuchungen die tatäschliche Zeit - genau wie FAK

            if (start.Second == 0)
            {
                return start.Date != end.Date ?
                    $"{start.ToShortDateString()} {start.ToShortTimeString()} - {end.ToShortDateString()} {end.ToShortTimeString()}" :
                    $"{start.ToShortDateString()} {start.ToShortTimeString()} - {end.ToShortTimeString()}";
            }

            return start.Date != end.Date ?
                $"{start.ToShortDateString()} - {end.ToShortDateString()}" :
                $"{start.ToShortDateString()}";
        }

        public bool HasRightToEditServiceRecord(ServiceRecordDC serviceRecord)
        {
            var allowed = false;

            if(MobileSessionFacade.CheckForUserRight(UserRightType.ServiceRecordView_Edit))
            {
                allowed = true;
            }
            else if(MobileSessionFacade.CheckForUserRight(UserRightType.ServiceRecord_AllowChangeWithin24Hours))
            {
                if(serviceRecord.InsertedOn != null)
                {
                    if(DateTime.Now < serviceRecord.InsertedOn.Value.AddDays(1))
                    {
                        allowed = true;
                    }
                }
            }

            if(allowed && ApplicationSettings.MaxDaysEditServiceRecordsAllowed > 0)
            {
                if(!MobileSessionFacade.CheckForUserRight(UserRightType.ServiceRecord_AllowEditAfterMaxDaysInNextMonth))
                {
                    if(serviceRecord.Start != null)
                    {
                        var date = new DateTime(serviceRecord.Start.Value.Year, serviceRecord.Start.Value.Month, 1);
                        date = date.AddMonths(1);
                        date = date.AddDays(ApplicationSettings.MaxDaysEditServiceRecordsAllowed);

                        if(DateTime.Now >= date)
                        {
                            allowed = false;
                        }
                    }
                }
            }

            if(allowed && !MobileSessionFacade.CheckForUserRight(UserRightType.ServiceRecord_AllowEditForOtherEmployees))
            {
                if(MobileSessionFacade.LoggedInEmployee.EmployeeOid != serviceRecord.Employee.EmployeeOid)
                {
                    allowed = false;
                }
            }

            if(allowed && serviceRecord.GroupOid.HasValue)
            {
                if(!MobileSessionFacade.CheckForUserRight(UserRightType.ServiceRecord_AllowCreatingGroupBooking))
                {
                    allowed = false;
                }
            }

            if(allowed && ApplicationSettings.AnzTageZeiterfassErfolgt > 0)
            {
                if(!MobileSessionFacade.CheckForUserRight(UserRightType.ServiceRecordAllowEditAfterMindays))
                {
                    if(serviceRecord.Start != null)
                    {
                        var date = new DateTime(serviceRecord.Start.Value.Year, serviceRecord.Start.Value.Month, serviceRecord.Start.Value.Day);
                        date = date.AddDays(ApplicationSettings.AnzTageZeiterfassErfolgt + 1);
                        if(DateTime.Now >= date)
                        {
                            allowed = false;
                        }
                    }
                }
            }

            return allowed;
        }

        public bool IsZeiterfassungInStdMin => EinheitZeiterfassung == 2;

        public int EinheitZeiterfassung { get; set; }

        public string StartDateToEdit => SelectedServiceRecord?.Start?.ToShortDateString() ?? DateTime.Today.ToShortDateString();

        public string EndDateToEdit => SelectedServiceRecord?.End?.ToShortDateString() ?? DateTime.Today.ToShortDateString();

        public string StartTimeToEdit
        {
            get
            {
                var start = SelectedServiceRecord?.Start;

                if(start != null && !start.Value.GetServiceRecordNoDateTimeDate().Equals(start))
                {
                    return start.Value.ToString("HH:mm");
                }

                return string.Empty;
            }
        }

        public string EndTimeToEdit
        {
            get
            {
                var end = SelectedServiceRecord?.End;

                if(end != null && end.Value.Second != 1)
                {
                    return end.Value.ToString("HH:mm");
                }

                return string.Empty;
            }
        }

        public string DurationToEdit
        {
            get
            {
                if(SelectedDurationUnit == "Stunden")
                {
                    return SelectedServiceRecord is null ? string.Empty : (SelectedServiceRecord.RoundedDuration / 60).ToString();
                }

                return SelectedServiceRecord?.RoundedDuration.ToString() ?? string.Empty;
            }
        }

        public string DistanceToEdit => SelectedServiceRecord?.DistanceInMeterDecimal.ToString() ?? string.Empty;

        public string NoticeToEdit => SelectedServiceRecord?.NoticeList.FirstOrDefault() ?? string.Empty;

        public List<string> NoticeListToEdit => SelectedServiceRecord != null ? SelectedServiceRecord.NoticeList : new List<string> {string.Empty, string.Empty, string.Empty, string.Empty, string.Empty};

        public string SubmitButtonValue => IsInEditingMode || IsInGroupBookingMode ? "Speichern" : "Anlegen";

        public long SelectedServiceRecordsServiceDescriptionOid => SelectedServiceRecord?.ServiceDescription?.ServiceDescriptionOid ?? 0L;

        public ServiceRecordDC GetServiceRecord(long serviceRecordOid)
        {
            return ServiceRecords.FirstOrDefault(serviceRecord => serviceRecord.ServiceRecordOid.Equals(serviceRecordOid));
        }

        public List<RatingTypeDC> GoalRatingTypes { get; set; } = new List<RatingTypeDC>();

        public ValueListEntryDC GetGoalByOid(long goalOid)
        {
            return SelectedSupportConcept?.Goals.FirstOrDefault(goal => goal.ValueListEntryOid == goalOid);
        }

        public bool HasAnyRatingTypes { get; set; }

        public List<GoalTreeItem> GoalTree { get; set; } = new List<GoalTreeItem>();
        public List<TextbausteinDisplayItem> AllTextModules { get; set; } = new List<TextbausteinDisplayItem>();

        public bool SetStartTimeToEndTimeAfterSave { get; set; }

        public DateTime? NewStartDate { get; set; }
        public string NewStartTime
        {
            get
            {
                var start = NewStartDate;

                if(start.HasValue && !start.Value.GetServiceRecordNoDateTimeDate().Equals(start))
                {
                    return start.Value.ToString("HH:mm");
                }

                return string.Empty;
            }
        }
        public string NewStartDateStr => NewStartDate?.ToShortDateString();

        public DateTime? NewEndDate { get; set; }
        public string NewEndTime
        {
            get
            {
                var start = NewEndDate;

                if(start != null && !start.Value.GetServiceRecordNoDateTimeDate().Equals(start))
                {
                    return start.Value.ToString("HH:mm");
                }

                return string.Empty;
            }
        }
        public string NewEndDateStr => NewEndDate?.ToShortDateString();

        public int? NewDuration
        {
            get
            {
                if(NewStartDate.HasValue && NewEndDate.HasValue)
                {
                    return (int?) (NewEndDate.Value - NewStartDate.Value).TotalMinutes;
                }

                return null;
            }
        }

        public bool IsShowingDurationInHours { get; set; }

        public string SelectedDurationUnit => IsShowingDurationInHours ? "Stunden" : "Minuten";

        public DateTime LastSelectedServiceRecordMonth { get; set; }
        public int LastSelectedServiceRecordTimeIntervalDays { get; set; }

        /// <summary>
        /// Zeitraum der Zeiterfassungseintragsliste (z.B. Alle, Letzte 7 Tage, etc.)
        /// </summary>
        public ServiceRecordTimeInterval ServiceRecordTimeInterval { get; set; }
        public int SelectedDayCount { get; set; }
        public NullableDateTimeSpan SelectedZeitraum { get; set; }

        public bool IsOnlyYearMonthVisible { get; set; }

        #region Mehrfachbuchung

        private bool _IsInMultiBookingMode;

        [Display(Name = "Mehrfachbuchung")]
        public bool IsInMultiBookingMode
        {
            get => _IsInMultiBookingMode;

            set
            {
                _IsInMultiBookingMode = value;

                if(!_IsInMultiBookingMode)
                {

                }
            }
        }

        public List<SupportConceptDC> MultiBookingSelectedSupportConcepts { get; set; } = new List<SupportConceptDC>();

        public List<long> MultiBookingSelectedGroupOfPeopleOids { get; set; } = new List<long>();

        public List<SupportConceptCostBearerRelDC> MultiBookingSelectedConceptCostBearerRelations { get; set; }

        public GroupBookingSelectionObject MultiBookingSelectionObject => new GroupBookingSelectionObject(MultiBookingSelectedConceptCostBearerRelations, MultiBookingSelectedGroupOfPeopleOids);

        public List<long> MultiBookingSelectedCostbearerRelOids { get; set; } = new List<long>();
        public List<CompactEmployeeDC> MultiBookingSelectedEmployees { get; set; } = new List<CompactEmployeeDC>();

        public List<CostBearer2SupportConceptRelListObject> MultiBookingSupportConceptListObjects
        {
            get
            {
                var allCostbearerRelations = new List<CostBearer2SupportConceptRelListObject>();

                foreach(var sc in SupportConcepts.OrderBy(sc => sc.Customer.LastName))
                {
                    allCostbearerRelations.AddRange(sc.CostBearerRelations.Where(w => ShowExpiredSupportConcepts || w.EndDate == null || w.EndDate.Value >= DateTime.Now).Select(
                        cb => new CostBearer2SupportConceptRelListObject(
                            $"{sc.Customer.SimpleDescription} {(sc.Customer.DateOfBirth.HasValue ? "*" + sc.Customer.DateOfBirth.Value.ToString("dd.MM.yyyy") : string.Empty)}",
                            $"{cb.AuswahlBezeichnung} {cb.StartDate?.ToShortDateString().Remove(6, 2) ?? string.Empty}-{cb.EndDate?.ToShortDateString().Remove(6, 2) ?? string.Empty} {cb.CostBearer.Name}",
                            cb.CostBearer2SupportConceptOid.ToString(),
                            cb.SupportConcept.IsAboutToExpire,
                            cb.SupportConcept.ExpiresIn3MonthOrLess))
                    );
                }

                return allCostbearerRelations;
            }
        }

        #endregion

        public MandatorDC Mandator { get; set; }

        public bool IsPasswordSecurityEnabled { get; set; }

        public bool ShowMarker { get; set; }

        #region ServiceRecord-Pagination
        public int ServiceRecordCount { get; set; }

        public int CurrentPage { get; set; }

        public int MaxResults { get; set; } = 10;

        public int ServiceRecordPageCount { get; set; }

        #endregion

        public string OneTimeLink { get; set; }
        public string OneTimeLinkText { get; set; }

        public string ShareDetails { get; set; }

        public bool IsCustomerAbsence { get; set; }
        public string CustomerAbsenceInfo { get; set; }

        public Dictionary<long, List<string>> ServiceRecordOids2GoalHeader { get; set; }

        public bool FilterGroupServiceCategories { get; set; }

        public Dictionary<ServiceCategoryDC, List<ServiceDescriptionDC>> Categories2Descriptions { get; set; } = new Dictionary<ServiceCategoryDC, List<ServiceDescriptionDC>>();

        public ServiceCategoryDC SelectedServiceCategory { get; set; }

        public ServiceDescriptionDC SelectedServiceDescription { get; set; }

        public ServiceDescriptionDC GetSelectedOrFirstServiceDescription()
        {
            if(!(SelectedServiceDescription is null) || Categories2Descriptions is null)
            {
                return SelectedServiceDescription;
            }

            var firstServiceCategory2ServiceDescriptions = Categories2Descriptions.OrderBy(c2d => c2d.Key.Position).ThenBy(c2d => c2d.Key.ServiceCategoryOid).FirstOrDefault(c2d => c2d.Value.Any());

            if(firstServiceCategory2ServiceDescriptions.Key != null && (firstServiceCategory2ServiceDescriptions.Value?.Any() ?? false))
            {
                return firstServiceCategory2ServiceDescriptions.Value.OrderBy(sd => sd.Position).ThenBy(sd => sd.ServiceDescriptionOid).First();
            }

            return SelectedServiceDescription;
        }

        public bool ShowBetrag { get; set; }
    }

    public class CustomSelectListItem
    {
        public string Text1 { get; }
        public string Text2 { get; }
        public string Value { get; }
        public string TextColor { get; }
        public long? SupportConceptOid { get; }
        public long? CostBearer2SupportConceptOid { get; }

        public CustomSelectListItem(string pText1, string pText2, string pValue, string pTextColor, long? supportConceptOid, long? costBearer2SupportConceptOid)
        {
            Text1     = pText1;
            Text2     = pText2;
            Value     = pValue;
            TextColor = pTextColor;
            SupportConceptOid = supportConceptOid;
            CostBearer2SupportConceptOid = costBearer2SupportConceptOid;
        }
    }

    public class CostBearer2SupportConceptRelListObject
    {
        public string NameAndDateOfBirth { get; }

        public string SupportConceptTimeSpan { get; }

        public string CostBearer2SupportConceptOid { get;  }

        public string CostBearer2SupportConceptOidName { get; }

        public bool IsAboutToExpire { get; }
        public bool ExpiresInThreeMonthsOrLess { get; }


        public CostBearer2SupportConceptRelListObject(string pNameAndDateOfBirth, string pSupportConceptTimeSpan, string pCostBearer2SupportConceptOid, bool isAboutToExpire, bool expiresIn3MonthOrLess)
        {
            NameAndDateOfBirth = pNameAndDateOfBirth;
            SupportConceptTimeSpan = pSupportConceptTimeSpan;
            CostBearer2SupportConceptOid = pCostBearer2SupportConceptOid;

            CostBearer2SupportConceptOidName = "OidHolder_" + CostBearer2SupportConceptOid;

            IsAboutToExpire = isAboutToExpire;
            ExpiresInThreeMonthsOrLess = expiresIn3MonthOrLess;
        }

        public override bool Equals(object obj)
        {
            if (!(obj is CostBearer2SupportConceptRelListObject))
            {
                return false;
            }

            var obj2 = (CostBearer2SupportConceptRelListObject) obj;

            return Equals(CostBearer2SupportConceptOid, obj2.CostBearer2SupportConceptOid);
        }

        public override int GetHashCode()
        {
            unchecked
            {
                const int hashingBase = (int)2166136261;
                const int hashingMultiplier = 16777619;

                var hash = hashingBase;

                hash = (hash * hashingMultiplier) ^ (NameAndDateOfBirth?.GetHashCode() ?? 0);
                hash = (hash * hashingMultiplier) ^ (SupportConceptTimeSpan?.GetHashCode() ?? 0);
                hash = (hash * hashingMultiplier) ^ (CostBearer2SupportConceptOid?.GetHashCode() ?? 0);
                hash = (hash * hashingMultiplier) ^ IsAboutToExpire.GetHashCode();
                hash = (hash * hashingMultiplier) ^ ExpiresInThreeMonthsOrLess.GetHashCode();

                return hash;
            }
        }
    }
}