using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Web.Mvc;

using BeWoPlanerMobil.Models;
using BeWoPlanerMobil.Service;
using BeWoPlanerMobil.Util;
using BS.Shared;
using BS.Shared.DataContracts;
using BS.Shared.DataContracts.Compact;
using BS.Shared.Extensions;
using DevExpress.XtraScheduler;
using DevExpress.XtraScheduler.Compatibility;
using Newtonsoft.Json;
using static BeWoPlanerMobil.Util.MobileUtils;
using RecurrenceInformation = BS.Shared.Core.RecurrenceInformation;

namespace BeWoPlanerMobil.Controllers
{
    public class SchedulerController : AbstractBaseController
    {
        private SchedulerModel _Model;
        public SchedulerModel Model
        {
            get
            {
                if (!MobileSessionFacade.IsUserLoggedIn())
                {
                    Logout();
                    return null;
                }

                if (_Model == null)
                {
                    _Model = new SchedulerModel();
                    InitModel(_Model);
                    InitViewModel();
                }

                //if (((SchedulerModel) Session[ModelSessionConstants.SchedulerModelKey])?.LoggedInEmployee is null)
                //{
                //    _Model = new SchedulerModel();
                //    InitModel(_Model);
                //    Session[ModelSessionConstants.SchedulerModelKey] = _Model;
                //}
                //else
                //{
                //    _Model = (SchedulerModel) Session[ModelSessionConstants.SchedulerModelKey];
                //}

                return _Model;
            }
        }

        private void InitViewModel()
        {
            if (Model.HasRightToInsertRessourceAppointments || Model.HasRightToViewAllResourceAppointments)
            {
                var allResources = KalenderService.GetAllResources().OrderBy(r => r.Name).ToList();

                var categories2Resources = new Dictionary<ValueListEntryDC, List<ResourceDC>>();

                foreach (var category in allResources.Select(resource => resource.ResourceCategory))
                {
                    categories2Resources.AddOrUpdateValueInDictionary(category, allResources.Where(resource => resource.ResourceCategory.Equals(category)).OrderBy(r => r.Name).ToList());
                }

                Model.ResourceCategories2Resources = categories2Resources.OrderBy(kvp => kvp.Key.DisplayName).ToDictionary(kvp => kvp.Key, kvp => kvp.Value);
            }

            if (Model?.LoggedInEmployee?.EmployeeOid.HasValue ?? false)
            {
                var compactEmployee = EmployeeService.GetActiveCompactEmployeeWithOid(Model.LoggedInEmployee.EmployeeOid.Value);

                Model.MyTeamEmployees = EmployeeService.GetAllTeamMember(compactEmployee).OrderBy(employee => employee.LastName).ToList();
            }
            else if (!(Model is null))
            {
                Model.MyTeamEmployees = new List<CompactEmployeeDC>();
            }

            if (Model.HasRightToViewTeams && (Model?.LoggedInEmployee?.EmployeeOid.HasValue ?? false))
            {
                Model.MyTeams = EmployeeService.GetAllActiveCompactTeamsForEmployee(Model.LoggedInEmployee.EmployeeOid.Value).OrderBy(team => team.Name).ToList();
            }

            if (!(Model is null))
            {
                Model.TeamMemberCustomerOids = EmployeeService.LoadTeamsRelatedCustomerOids(LoggedInUser.Employee.EmployeeOid);
            }

            if (Model.HasRightToViewCustomerSelectionInScheduler)
            {
                Model.AllCustomers = CustomerService.GetAllActiveCompactCustomers().OrderBy(customer => customer.LastName).ToList();
            }

            if (Model.HasRightToViewEmployeeAppointments)
            {
                Model.AllEmployees = EmployeeService.GetAllActiveEmployeesCompact().OrderBy(employee => employee.LastName).ToList();
            }

            //LoadAppointmentsForDate();

            if (Model.SelectedAppointmentOid.HasValue)
            {
                if (Model.Appointments == null)
                {
                    LoadAppointmentsForDate();
                }
                Model.SelectedAppointment = Model.Appointments.FirstOrDefault(app => app.SchedulerAppointmentOid.HasValue && app.SchedulerAppointmentOid.Value == Model.SelectedAppointmentOid.Value);
            }
            SetHasResourcesEmployeesOrCustomers();
            UpdateSelectedObjects();

            
        }

        private void UpdateSelectedObjects()
        {
            //mache aus dem Ressourcenkategorien Dictionary eine flache Liste:
            var list = new List<ResourceDC>();
            Model.ResourceCategories2Resources.Values.DoForEach(l => l.DoForEach(s => list.AddIfNotIn(s)));
            
            Model.SelectedEmployees = Model.AllEmployees.Where(employee => Model.SelectedEmployeeOids.Contains(employee.EmployeeOid)).ToList();
            Model.SelectedCustomers = Model.AllCustomers.Where(customer => Model.SelectedCustomerOids.Contains(customer.CustomerOid)).ToList();
            Model.SelectedResources = list.Where(resource => resource.ResourceOid.HasValue && Model.SelectedResourceOids.Contains(resource.ResourceOid.Value)).ToList();

            Model.SelectedEmployeesForFiltering = Model.AllEmployees.Where(employee => Model.SelectedEmployeeOidsForFiltering.Contains(employee.EmployeeOid)).ToList();
            Model.SelectedCustomersForFiltering = Model.AllCustomers.Where(customer => Model.SelectedCustomerOidsForFiltering.Contains(customer.CustomerOid)).ToList();
            Model.SelectedResourcesForFiltering = list.Where(resource => resource.ResourceOid.HasValue && Model.SelectedResourceOidsForFiltering.Contains(resource.ResourceOid.Value)).ToList();

            Model.SelectedEmployeesForIntervalFinder = Model.AllEmployees.Where(employee => Model.SelectedEmployeeOidsForIntervalFinder.Contains(employee.EmployeeOid)).ToList();
            Model.SelectedCustomersForIntervalFinder = Model.AllCustomers.Where(customer => Model.SelectedCustomerOidsForIntervalFinder.Contains(customer.CustomerOid)).ToList();
            Model.SelectedResourcesForIntervalFinder = list.Where(resource => resource.ResourceOid.HasValue && Model.SelectedResourceOidsForIntervalFinder.Contains(resource.ResourceOid.Value)).ToList();
        }

        // ToDo: Überarbeiten? Es kam das Ansehen hinzu
        private void SetHasResourcesEmployeesOrCustomers()
        { 
            var isOwnAppointment = !Model.IsInEditMode || Model.SelectedAppointment?.Originator.EmployeeOid == LoggedInEmployee.EmployeeOid;

            var v1 = Model.HasRightToInsertEmployeeAppointments || Model.IsInEditMode && Model.HasRightToEditEmployeeAppointments;

            var v2 = Model.HasRightToInsertRessourceAppointments || Model.IsInEditMode && Model.HasRightToEditResourceAppointments;

                    if (Model.IsInEditMode && !isOwnAppointment)
                    {
                        v2 = Model.HasRightToEditOthersResourceAppointments;
                    }

            var v3 = Model.HasRightToInsertCustomerAppointments || Model.IsInEditMode && Model.HasRightToEditCustomerAppointments;

            Model.HasResourcesEmployeesOrCustomers = v1 || v2 || v3;
            
        }

        [Authorize]
        public ActionResult Scheduler()
        {
            if(!MobileSessionFacade.IsUserLoggedIn() || Request.Browser.Browser.Equals("InternetExplorer") || !Model.IsAllowedToSeeScheduler)
            {
                return Logout();
            }


            return View(Model);
        }

        private void LoadAppointmentsForDate()
        {
            if(Model?.LoggedInEmployee.EmployeeOid is null)
            {
                return;
            }

            var date = Model.SelectedDate;
            var monday = date.GetInSameCalendarWeek(DayOfWeek.Monday);
            var sunday = monday.Date.AddDays(6);

            var start = date;
            var end = date.AddDays(1);

            if(Model.SelectedSchedulerView == "5")
            {
                start = monday;
                end = monday.AddDays(4);
            }
            else if(Model.SelectedSchedulerView == "7")
            {
                start = monday;
                end = sunday;
            }

            var selectedCustomers = Model.SelectedCustomerOidsForFiltering;
            var selectedEmployees = Model.SelectedEmployeeOidsForFiltering.Clone(); //Wird soinst im KalenderService geändert
            var selectedResources = Model.SelectedResourceOidsForFiltering;

            var appointments = KalenderService.LoadFilteredAppointmentsMitAufgaben(Model.HasRightToViewEmployeeAppointments, Model.LoggedInEmployee.EmployeeOid.Value, start.Date, end, selectedEmployees, selectedCustomers, selectedResources, false, false, false, false, true, true).ToList();

            // Private Termine
            foreach(var appointment in appointments.Where(a => a.IsPrivate))
            {
                if(appointment.Originator.Equals(LoggedInUser.Employee) || appointment.EmployeeList.Any(e2a => e2a.Employee.Equals(LoggedInUser.Employee)))
                {
                    continue;
                }

                appointment.CanBeEdited = false;
                appointment.Description = "Privater Termin";
                appointment.Subject = $"Privat ({appointment.Originator})";
            }

            // Unerledigte Aufgaben
            var tasks = appointments.Where(w => w.IsTask && w.CompletedDate is null).ToList();

            // Nur eigene Kliententermine ansehen
            if(!Model.HasRightToViewCustomerAppointments)
            {
                appointments = appointments.Where(a => a.CustomerList.All(c => LoggedInEmployee.RelatedCustomers.Any(rc => rc.Customer.Equals(c)))).ToList();
            }

            if(!Model.HasRightToViewAllResourceAppointments)
            {
                appointments = appointments.Where(a => a.ResourceList.Count == 0).ToList();
            }

            if(!Model.IsAllowedToSeeCustomers)
            {
                appointments = appointments.Where(a => a.CustomerList.Count == 0).ToList();
            }

            // Wenn es ein ganztägiger Termin ist, eine Sekunde abziehen und beim Speichern wieder draufaddieren?
            foreach(var app in appointments.Where(a => a.AllDay))
            {
                if(app.EndDate is null)
                {
                    continue;
                }

                app.EndDate = app.EndDate.Value.AddMinutes(-1);
            }

            var holySweetFlyingFuck = appointments.Where(w =>
                w.IsTask == false && // Aufgaben ausschließen
                w.StartDate.HasValue && w.EndDate.HasValue && // Datumsangaben haben einen Wert
                  (date.InBetween(w.StartDate.Value, w.EndDate.Value, false) || date.CompareShortDates(w.StartDate.Value))
                      // Einzeltermine oder Ausnahmen und gelöschte Ausnahmen
                      && (w.RecurrenceInfo is null || w.RecurrenceInfo != null && (w.Type == 3 || w.Type == 4))
                ).ToList();

            var deletedOccurrences = holySweetFlyingFuck.Where(w => w.Type == 4).Select(s => BS.Shared.Core.Utils.GetOccurrenceId(s.RecurrenceInfo)).ToList();
            var changedOccurrences = holySweetFlyingFuck.Where(w => w.Type == 3).Select(s => BS.Shared.Core.Utils.GetOccurrenceId(s.RecurrenceInfo)).ToList();

            holySweetFlyingFuck = holySweetFlyingFuck.Where(w => w.Type != 4).ToList();

            holySweetFlyingFuck.AddRangeIfElementsNotIn(CalculateRecurrences(appointments, start, end, changedOccurrences, deletedOccurrences));

            holySweetFlyingFuck.AddRange(tasks);

            Model.Appointments = Model.ShouldLoadTasks ? 
                holySweetFlyingFuck.OrderByDescending(appointment => appointment.IsTask).ThenBy(appointment => appointment.StartDate).ToList() : 
                holySweetFlyingFuck.Where(w => w.IsTask is false).OrderBy(appointment => appointment.StartDate).ToList();

            UpdateAppointmentListItems();

            Model.WeekViewObject = new WeekViewObject(Model.Appointments, Model.SelectedDate.GetInSameCalendarWeek(DayOfWeek.Monday), Model.LoggedInEmployee);

            
        }
        private void UpdateAppointmentListItems()
        {
            var md5 = new MD5CryptoServiceProvider();
            

            var list = new List<AppointmentListItem>();

            foreach (var appointment in Model.Appointments)
            {
                String key = String.Format("{0}_{1}", appointment.SchedulerAppointmentOid, appointment.RecurrenceInfo);
                String id = BitConverter.ToString(md5.ComputeHash(Encoding.UTF8.GetBytes(key))).Replace("-", "").ToLower();
                var listItem = new AppointmentListItem(id, appointment);

                

                list.Add(listItem);
            }

            Model.AppointmentListItems = list;
        }

        private static IEnumerable<SchedulerAppointmentDC> CalculateRecurrences(IEnumerable<SchedulerAppointmentDC> appointments, DateTime start, DateTime end, IReadOnlyCollection<RecurrenceInformation> changedOccurrences, IReadOnlyCollection<RecurrenceInformation> deletedOccurrences)
        {
            var result = new List<SchedulerAppointmentDC>();

            var interval = new TimeInterval(start, end);

            foreach (var appointment in appointments.Where(app => app.RecurrenceInfo != null && app.Type == 1))
            {
                var recurrenceInfo = new RecurrenceInfo();
                recurrenceInfo.FromXml(appointment.RecurrenceInfo);
                var occurrenceCalculator = OccurrenceCalculator.CreateInstance(recurrenceInfo);

                var pattern = StaticAppointmentFactory.CreateAppointment(AppointmentType.Pattern);
                pattern.RecurrenceInfo.FromXml(appointment.RecurrenceInfo);
                pattern.Start = pattern.RecurrenceInfo.Start;
                pattern.End = pattern.RecurrenceInfo.End;
                var patternId = pattern.RecurrenceInfo.Id.ToString();

                var occurrences = occurrenceCalculator.CalcOccurrences(interval, pattern);

                if(occurrences.Count > 0)
                {
                    foreach(var app in occurrences.GetAppointments(interval))
                    {
                        var index = app.RecurrenceIndex;
                        
                        var duration = (appointment.EndDate.Value - appointment.StartDate.Value).TotalMinutes;

                        var isOutOfInterval = app.Start.GetShortDateTime().AreInBetweenDates(app.Start.AddMinutes(duration), start, end) == false;
                        var isChangedOccurrence = changedOccurrences.Any(a => a.PatternId.Equals(patternId) && a.Index == index);
                        var isDeletedOccurrence = deletedOccurrences.Any(a => a.PatternId.Equals(patternId) && a.Index == index);

                        if(isOutOfInterval || isChangedOccurrence || isDeletedOccurrence)
                        {
                            continue;
                        }

                        var recurringAppointment = new SchedulerAppointmentDC
                        {
                            AllDay                   = appointment.AllDay,
                            CustomerList             = appointment.CustomerList,
                            Description              = appointment.Description?.RemoveUppercaseEsszett(),
                            EmployeeList             = appointment.EmployeeList,
                            EndDate                  = app.Start.AddMinutes(duration),
                            FormerBookingSequenceOid = appointment.FormerBookingSequenceOid,
                            IsPrivate                = appointment.IsPrivate,
                            LabelKey                 = appointment.LabelKey,
                            Location                 = appointment.Location?.RemoveUppercaseEsszett(),
                            Originator               = appointment.Originator,
                            RecurrenceInfo           = app.RecurrenceInfo.ToXml(),
                            RecurrenceIndex          = index,
                            ReminderInfo             = appointment.ReminderInfo,
                            ResourceList             = appointment.ResourceList,
                            StartDate                = app.Start,
                            Subject                  = appointment.Subject?.RemoveUppercaseEsszett() ?? "",
                            Type                     = (int) app.Type,
                            ServiceRecordList        = appointment.ServiceRecordList,
                            SupportConceptList       = appointment.SupportConceptList
                        };

                        result.AddIfNotIn(recurringAppointment);
                    }
                }
            }

            // Es wird bei ganztägigen Serienterminen eine Minute abgezogen, damit die nicht als zweitägig angezeigt werden. Bearbeiten kann man Serientermin im MoK noch nicht.
            foreach(var app in result.Where(w => w.AllDay && w.EndDate.HasValue))
            {
                app.EndDate = app.EndDate.Value.AddMinutes(-1);
            }

            return result;
        }

        [Authorize]
        [HttpPost]
        public ActionResult InsertOrUpdateAppointment(FormCollection formCollection)
        {
            try
            {
                if(Model is null)
                {
                    TempData[TempDataConstants.DoLogoutKey] = true;
                    return Logout();
                }

                var rawStartDate = formCollection[FormCollectionConstants.AppointmentStartDateKey];
                var rawEndDate   = formCollection[FormCollectionConstants.AppointmentEndDateKey];
                var subject      = formCollection[FormCollectionConstants.AppointmentSubjectKey] ?? string.Empty;
                var location     = formCollection[FormCollectionConstants.AppointmentLocationKey] ?? string.Empty;
                var notice       = formCollection[FormCollectionConstants.AppointmentNoticeKey] ?? string.Empty;

                subject  = subject.RemoveUppercaseEsszett();
                location = location.RemoveUppercaseEsszett();
                notice   = notice.RemoveUppercaseEsszett();

                var isPrivate = formCollection[FormCollectionConstants.AppointmentIsPrivateKey] == "on";
                var allDay = formCollection[FormCollectionConstants.AppointmentIsAllDayKey] == "on";

                var startAndEnd = ConvertStringDatesToDateTimes(rawStartDate, rawEndDate);

                var startDate = startAndEnd.StartDate;
                var endDate = startAndEnd.EndDate;

                var appointmentToInsert = Model.SelectedAppointment ?? new SchedulerAppointmentDC();

                var isNew = !appointmentToInsert.SchedulerAppointmentOid.HasValue;

                var appointmentEmployeeList = new List<Employee2SchedulerAppointmentDC>();
                if(Model.SelectedEmployees?.Any() ?? false)
                {
                    foreach(var employee in Model.SelectedEmployees)
                    {
                        var employee2Appointment = new Employee2SchedulerAppointmentDC
                        {
                            Employee = employee,
                        };

                        appointmentEmployeeList.Add(employee2Appointment);
                    }
                }

                if(allDay)
                {
                    startDate = startDate.Date;
                    endDate = endDate.AddDays(1);
                }

                appointmentToInsert.EmployeeList       = appointmentEmployeeList;
                appointmentToInsert.CustomerList       = Model.SelectedCustomers;
                appointmentToInsert.ResourceList       = Model.SelectedResources ?? new List<ResourceDC>();
                appointmentToInsert.SupportConceptList = isNew ? new List<CompactSupportConceptDC>() : appointmentToInsert.SupportConceptList;
                appointmentToInsert.ServiceRecordList  = isNew ? new List<ServiceRecordDC>() : appointmentToInsert.ServiceRecordList;
                appointmentToInsert.EndDate            = endDate;
                appointmentToInsert.StartDate          = startDate;
                appointmentToInsert.Subject            = subject;
                appointmentToInsert.Description        = notice;
                appointmentToInsert.Originator         = LoggedInUser.Employee;
                appointmentToInsert.Location           = location;
                appointmentToInsert.ActivationType     = ActivationTypeId.Active;
                appointmentToInsert.IsPrivate          = isPrivate;
                appointmentToInsert.AllDay             = allDay;

                // Eine Minute addieren, wenn die Uhrzeit eines ganztägigen Termins nicht exakt 00:00 ist.
                // ToDo: Wird beim SelectAppointmentToEdit gemacht, damit die Formularanzeige korrekt ist!
                if(allDay && endDate.Hour == 23 && endDate.Minute == 59)
                {
                    appointmentToInsert.EndDate = endDate.AddMinutes(1);
                }

                // ToDo: Rechte beachten!
                if(appointmentToInsert.CanBeEdited)
                {
                    if(!isNew)
                    {
                        KalenderService.UpdateSchedulerAppointments(new List<SchedulerAppointmentDC> {appointmentToInsert});
                    }
                    else
                    {
                        KalenderService.InsertSchedulerAppointments(new List<SchedulerAppointmentDC> {appointmentToInsert});
                    }
                }
            }
            catch(Exception exception)
            {
                Log.Error(exception.Message, exception);
            }
            finally
            {
                if(Model != null)
                {
                    Model.IsAllDay = false;
                    Model.SelectedAppointmentOid = null;
                    Model.SelectedResourceOids?.Clear();
                    Model.SelectedCustomerOids?.Clear();
                    Model.SelectedEmployeeOids?.Clear();
                }
            }
            
            return RedirectToActionPermanent("Scheduler");
        }

        [Authorize]
        [HttpPost]
        public ActionResult NavigateToPreviousDate()
        {
            if (Model is null)
            {
                TempData[TempDataConstants.DoLogoutKey] = true;
                return Logout();
            }

            Model.SelectedDate = Model.SelectedDate.AddDays(-1);

            if(Model != null)
            {
                Model.SelectedAppointmentOid = null;
                //Model.SelectedResources.Clear();
            }

            return RedirectToActionPermanent("Scheduler");
        }

        [Authorize]
        [HttpPost]
        public ActionResult NavigateToNextDate()
        {
            if(Model is null)
            {
                TempData[TempDataConstants.DoLogoutKey] = true;
                return Logout();
            }

            Model.SelectedDate = Model.SelectedDate.AddDays(1);

            if(!(Model is null))
            {
                Model.SelectedAppointmentOid = null;
                //Model.SelectedResources.Clear();
            }

            return RedirectToActionPermanent("Scheduler");
        }

        [Authorize]
        [HttpPost]
        public ActionResult SelectSchedulerDate(FormCollection formCollection) {
            if(Model is null)
            {
                TempData[TempDataConstants.DoLogoutKey] = true;
                return Logout();
            }

            var rawSchedulerDate = formCollection[FormCollectionConstants.AppointmentSchedulerDateKey];

            var schedulerDate = DateTime.ParseExact(rawSchedulerDate, "dd.MM.yyyy", null);

            Model.SelectedDate = schedulerDate;

            Model.SelectedAppointmentOid = null;
            Model.SelectedResourceOids.Clear();
            
            return RedirectToActionPermanent("Scheduler");
        }

        [Authorize]
        [HttpPost]
        public ActionResult SelectAppointmentToEdit(FormCollection formCollection)
        {
            if(Model is null)
            {
                TempData[TempDataConstants.DoLogoutKey] = true;
#if DEBUG
                TempData[TempDataConstants.ErrorMessageKey] = "Model war null";
#endif
                return Logout();
            }

            var rawOid = formCollection[FormCollectionConstants.AppointmentSchedulerOidHolderKey];

            var isSuccessful = long.TryParse(rawOid, out var appointmentOid);

            if(!isSuccessful)
            {
                return RedirectToActionPermanent("Scheduler");
            }

            LoadAppointmentsForDate();

            Model.SelectedAppointmentOid = appointmentOid;
            Model.SelectedAppointment = Model.Appointments.FirstOrDefault(app => app.SchedulerAppointmentOid.HasValue && app.SchedulerAppointmentOid.Value == appointmentOid);
            
            if (Model.SelectedAppointment != null)
            {
                if(Model.SelectedAppointment.AllDay && Model.SelectedAppointment.EndDate.HasValue)
                {
                    Model.SelectedAppointment.EndDate = Model.SelectedAppointment.EndDate.Value.AddMinutes(1).AddDays(-1);
                }

                Model.IsAllDay          = Model.SelectedAppointment.AllDay;
                Model.IsPrivate         = Model.SelectedAppointment.IsPrivate;
                Model.SelectedResourceOids = Model.SelectedAppointment?.ResourceList.Select(r => r.ResourceOid.Value).ToList() ?? new List<long>();
                Model.SelectedEmployeeOids = Model.SelectedAppointment?.EmployeeList.Select(e2a => e2a.Employee.EmployeeOid).ToList() ?? new List<long>();
                Model.SelectedCustomerOids = Model.SelectedAppointment?.CustomerList.Select(c => c.CustomerOid).ToList() ?? new List<long>();
            }

            return RedirectToActionPermanent("Scheduler");
        }

        [Authorize]
        public JsonResult ResetSelectedAppointment()
        {
            if(Model != null)
            {
                Model.SelectedAppointmentOid = null;
                Model.SelectedResourceOids.Clear();
                Model.SelectedEmployeeOids.Clear();
                Model.SelectedCustomerOids.Clear();
                Model.IsAllDay            = false;
                Model.IsPrivate           = false;
            }

            UpdateSelectedObjects();

            return Json(null, JsonRequestBehavior.AllowGet);
        }

        [Authorize]
        public JsonResult CheckForOverlappingAppointments(string startDateRaw, string endDateRaw, string startTimeRaw, string endTimeRaw)
        {
            if (Model is null)
            {
                Logout();
                return null;
            }

            var isOverlapping = false;
            var oid = Model.SelectedAppointmentOid;

            var isSuccessfulStartDate = DateTime.TryParseExact(startDateRaw, "dd.MM.yyyy", null, DateTimeStyles.None, out var startDate);
            var isSuccessfulStartTime = DateTime.TryParseExact(startTimeRaw, "HH:mm", null, DateTimeStyles.None, out var startTime);
            var isSuccessfulEndDate = DateTime.TryParseExact(endDateRaw, "dd.MM.yyyy", null, DateTimeStyles.None, out var endDate);
            var isSuccessfulEndTime = DateTime.TryParseExact(endTimeRaw, "HH:mm", null, DateTimeStyles.None, out var endTime);

            if (isSuccessfulStartDate && isSuccessfulStartTime && isSuccessfulEndDate && isSuccessfulEndTime)
            {
                startDate = startDate.MergeDatesByDate(startTime);
                endDate = endDate.MergeDatesByDate(endTime);

                var customerOidList = Model.SelectedAppointment?.CustomerList?.Select(customer => customer.CustomerOid).ToList() ?? new List<long>();
                var employeeOidList = Model.SelectedAppointment?.EmployeeList?.Select(employee2Appointment => employee2Appointment.Employee.EmployeeOid).ToList() ?? new List<long>();
                var resourceOidList = Model.SelectedResources.Where(resource => resource.ResourceOid.HasValue).Select(resource => resource.ResourceOid.Value).ToList() ?? new List<long>();

                var originator = Model.SelectedAppointment?.Originator ?? LoggedInUser.Employee;

                var recurrenceId = Model.SelectedAppointment?.RecurrenceId ?? string.Empty;
                var recurrenceIndex = Model.SelectedAppointment?.RecurrenceIndex ?? 0;

                isOverlapping = KalenderService.OverlappingAppointmentsExist(startDate, endDate, employeeOidList, customerOidList, resourceOidList, originator.EmployeeOid, oid, recurrenceId, recurrenceIndex);

                // TODO: Serientermine überprüfen
                if(Model.Appointments != null)
                {
                    foreach(var appointment in Model.Appointments.Where(app => app.SchedulerAppointmentOid is null && app.IsTask == false))
                    {

                    }
                }
            }

            return Json(isOverlapping, JsonRequestBehavior.AllowGet);
        }

        [Authorize]
        public string CheckResourcesAvailability(string start, string end, string resourceOids, bool allDay)
        {
            if(string.IsNullOrWhiteSpace(start) || string.IsNullOrWhiteSpace(end) || string.IsNullOrWhiteSpace(resourceOids) || Model is null)
            {
                return LeerzeichenFuerGetMethoden;
            }

            if(!Model.HasRightToInsertRessourceAppointments)
            {
                return "Fehler! Sie haben nicht das Recht, Termine mit Ressourcen anzulegen!";
            }

            var oidList = ConvertOidStringToList(resourceOids);

            foreach(var oid in oidList)
            {
                if(!Model.ResourceCategories2Resources.Any(a => a.Value.All(b => b.ResourceOid != oid)))
                {
                    return LeerzeichenFuerGetMethoden;
                }
            }

            var dateTimes = ConvertStringDatesToDateTimes(start, end);

            if(allDay)
            {
                dateTimes.EndDate = dateTimes.EndDate.AddDays(1);
            }

            var info = KalenderService.CheckResourceAvailabilityWithEmployeeInformation(dateTimes.StartDate, dateTimes.EndDate, oidList, Model.SelectedAppointmentOid, null);

            var result = string.Empty;

            foreach(var kvp in info)
            {
                result += $"Die Ressource \"{kvp.Key}\" ist im ausgewählten Zeitraum {start} bis {end} bereits gebucht";
                if(!kvp.Value.All(string.IsNullOrWhiteSpace))
                {
                    result += ":<br /><br />";
                }

                foreach(var interval in kvp.Value)
                {
                    result += $"{interval}<br />";
                }
            }

            return result;
        }

        [Authorize]
        public string HasSelectedAppointment()
        {
            return JsonConvert.SerializeObject(Model?.SelectedAppointmentOid.HasValue);
        }

        [Authorize]
        [HttpPost]
        public ActionResult ChangeSchedulerView(FormCollection formCollection)
        {
            if(Model is null)
            {
                TempData[TempDataConstants.DoLogoutKey] = true;
                return Logout();
            }

            var selectedSchedulerView = formCollection["SelectedSchedulerView"];

            Model.SelectedSchedulerView = selectedSchedulerView;

            return RedirectToActionPermanent("Scheduler");
        }

        [Authorize]
        [HttpPost]
        public ActionResult FindFreeIntervals(FormCollection formCollection)
        {
            if(Model is null)
            {
                TempData[TempDataConstants.DoLogoutKey] = true;
                return Logout();
            }

            var durationString  = formCollection["Duration"];
            var intervalStartDateString  = formCollection["IntervalStart"].Substring(0, 10);
            var intervalStartTimeString = formCollection["IntervalStartTime"];
            var intervalEndDateString  = formCollection["IntervalEnd"].Substring(0, 10);
            var intervalEndTimeString = formCollection["IntervalEndTime"];

            if(int.TryParse(durationString, out var intervalDuration) && DateTime.TryParse($"{intervalStartDateString} {intervalStartTimeString}", out var intervalStart) && DateTime.TryParse($"{intervalEndDateString} {intervalEndTimeString}", out var intervalEnd) && Model.LoggedInEmployee.EmployeeOid.HasValue)
            {
                var customerOids = Model.SelectedCustomerOidsForIntervalFinder.Clone();
                var employeeOids = Model.SelectedEmployeeOidsForIntervalFinder.Clone();
                var resourceOids = Model.SelectedResourceOidsForIntervalFinder.Clone(); 

                Model.FreeIntervals = KalenderService.FindAppointmentsInRangeForIntervalFinder(intervalDuration, intervalStart, intervalEnd, resourceOids, customerOids, employeeOids, Model.LoggedInEmployee.EmployeeOid.Value);

                Model.IntervalStartDate = intervalStart;
                Model.IntervalEndDate   = intervalEnd;
                Model.IntervalDuration  = intervalDuration;
            }

            return RedirectToActionPermanent("Scheduler");
        }

        [Authorize]
        public string SelectEmployeesForIntervalFinder(string oidString)
        {
            if (Model is null)
            {
                Logout();
                return LeerzeichenFuerGetMethoden;
            }

            
            Model.SelectedEmployeeOidsForIntervalFinder = ConvertOidStringToList(oidString);
            UpdateSelectedObjects();

            return JsonConvert.SerializeObject(Model.SelectedEmployeesForIntervalFinder.OrderBy(o => o.DetailDescription));
        }

        [Authorize]
        public string SelectCustomersForIntervalFinder(string oidString)
        {
            if (Model is null)
            {
                Logout();
                return LeerzeichenFuerGetMethoden;
            }

            Model.SelectedCustomerOidsForIntervalFinder = ConvertOidStringToList(oidString);
            UpdateSelectedObjects();

            return JsonConvert.SerializeObject(Model.SelectedCustomersForIntervalFinder.OrderBy(o => o.LastNameFirstName));
        }

        [Authorize]
        public string SelectResourcesForIntervalFinder(string resourceOids)
        {
            if(Model is null)
            {
                Logout();
                return LeerzeichenFuerGetMethoden;
            }

            
            Model.SelectedResourceOidsForIntervalFinder = ConvertOidStringToList(resourceOids);
            UpdateSelectedObjects();

            return JsonConvert.SerializeObject(Model.SelectedResourcesForIntervalFinder);
        }

        [Authorize]
        [HttpPost]
        public ActionResult SetIsInIntervalFinderMode(FormCollection formCollection)
        {
            if(Model is null)
            {
                TempData[TempDataConstants.DoLogoutKey] = true;
                return Logout();
            }

            var newValue = !Model.IsInIntervalFinderMode;

            Model.IsInIntervalFinderMode = newValue;

            if(!newValue)
            {
                Model.SelectedEmployeeOidsForIntervalFinder.Clear();
                Model.SelectedCustomerOidsForIntervalFinder.Clear();
                Model.SelectedResourceOidsForIntervalFinder.Clear();
            }

            return RedirectToActionPermanent("Scheduler");
        }

        [Authorize]
        [HttpPost]
        public ActionResult SelectIntervalForForm(FormCollection formCollection)
        {
            if(Model is null)
            {
                TempData[TempDataConstants.DoLogoutKey] = true;
                return Logout();
            }

            var startStr = formCollection["startDate"];
            var endStr = formCollection["endDate"];

            if(DateTime.TryParse(startStr, out var startDate) && DateTime.TryParse(endStr, out var endDate))
            {
                Model.IsInIntervalFinderMode = false;

                var employees2Appointment = new List<Employee2SchedulerAppointmentDC>();

                Model.SelectedEmployeesForIntervalFinder.DoForEach(employee =>
                {
                    employees2Appointment.Add(new Employee2SchedulerAppointmentDC
                    {
                        Employee = employee
                    });
                });

                Model.SelectedAppointment = new SchedulerAppointmentDC()
                {
                    ActivationType = ActivationTypeId.Active,
                    IsTask         = false,
                    IsPrivate      = false,
                    Originator     = LoggedInUser.Employee,
                    StartDate      = startDate,
                    EndDate        = endDate
                };

                Model.SelectedCustomerOids = Model.SelectedCustomerOidsForIntervalFinder.Clone();
                Model.SelectedEmployeeOids = Model.SelectedEmployeeOidsForIntervalFinder.Clone();
                Model.SelectedResourceOids = Model.SelectedResourceOidsForIntervalFinder.Clone();

                Model.SelectedCustomerOidsForIntervalFinder.Clear();
                Model.SelectedEmployeeOidsForIntervalFinder.Clear();
                Model.SelectedResourceOidsForIntervalFinder.Clear();

                Model.IntervalStartDate = null;
                Model.IntervalEndDate   = null;
            }
            
            return RedirectToActionPermanent("Scheduler");
        }

        [Authorize]
        public string ResetIntervalFinder()
        {
            if(Model is null)
            {
                return LeerzeichenFuerGetMethoden;
            }

            Model.SelectedCustomerOidsForIntervalFinder.Clear();
            Model.SelectedEmployeeOidsForIntervalFinder.Clear();
            Model.SelectedResourceOidsForIntervalFinder.Clear();

            Model.SelectedCustomersForIntervalFinder.Clear();
            Model.SelectedEmployeesForIntervalFinder.Clear();
            Model.SelectedResourcesForIntervalFinder.Clear();

            return LeerzeichenFuerGetMethoden;
        }

        [Authorize]
        public ActionResult FetchAppointments()
        {
            if(Model is null)
            {
                TempData[TempDataConstants.DoLogoutKey] = true;
                return PartialView("OneDaySchedulerPartial");
            }

            LoadAppointmentsForDate();

            return PartialView("OneDaySchedulerPartial", Model);
        }

        [Authorize]
        public string SelectResourcesForAppointmentFiltering(string resourceOids)
        {
            if(Model is null)
            {
                Logout();
                return LeerzeichenFuerGetMethoden;
            }

            var oidList = ConvertOidStringToList(resourceOids);

            var list = new List<ResourceDC>();

            Model.ResourceCategories2Resources.Values.DoForEach(l => l.DoForEach(s => list.AddIfNotIn(s)));

            Model.SelectedResourcesForFiltering = list.Where(resource => resource.ResourceOid.HasValue && oidList.Contains(resource.ResourceOid.Value)).ToList();
            Model.SelectedResourceOidsForFiltering = oidList;
            return JsonConvert.SerializeObject(Model.SelectedResourcesForFiltering);
        }

        [Authorize]
        public string SelectEmployeesForAppointmentFiltering(string oidString)
        {
            if(Model is null)
            {
                Logout();
                return LeerzeichenFuerGetMethoden;
            }

            Model.SelectedEmployeeOidsForFiltering = ConvertOidStringToList(oidString); 

            return Model.SelectedEmployeeOidsForFiltering.Count.ToString();
        }

        [Authorize]
        public string SelectCustomersForAppointmentFiltering(string oidString)
        {
            if(Model is null)
            {
                Logout();
                return LeerzeichenFuerGetMethoden;
            }

            Model.SelectedCustomerOidsForFiltering = ConvertOidStringToList(oidString); 

            return Model.SelectedCustomerOidsForFiltering.Count.ToString();
        }

        [Authorize]
        public ActionResult FetchSelectedEmployeesForPopup()
        {
            if (Model is null)
            {
                TempData[TempDataConstants.DoLogoutKey] = true;
            }

            return PartialView("EmployeeForFilteringPartial", Model);
        }

        [Authorize]
        public ActionResult FetchEmployeeFilteringModalBody()
        {
            if (Model is null)
            {
                TempData[TempDataConstants.DoLogoutKey] = true;
            }

            return PartialView("EmployeeFilteringModalContentPartial", Model);
        }

        [Authorize]
        public string SelectTeamForFiltering(string teamOidString)
        {
            if(Model?.LoggedInEmployee?.EmployeeOid is null)
            {
                Logout();
                return LeerzeichenFuerGetMethoden;
            }

            if(long.TryParse(teamOidString, out var teamOid))
            {
                var team = EmployeeService.FindTeamByOid(teamOid, Model.LoggedInEmployee.EmployeeOid.Value);

                if(!(team is null))
                {
                    Model.SelectedEmployeeOidsForFiltering.AddRangeIfElementsNotIn(team.Member.Select(m => m.EmployeeOid));
                }
            }
            UpdateSelectedObjects();
            return LeerzeichenFuerGetMethoden;
        }



        #region Mitarbeiterauswahl

        [Authorize]
        public string SelectTeamForAppointment(string teamOidString)
        {
            if(Model?.LoggedInEmployee?.EmployeeOid is null)
            {
                TempData[TempDataConstants.DoLogoutKey] = true;
                return LeerzeichenFuerGetMethoden;
            }

            var teamMemberOids = new List<long>();

            if(!long.TryParse(teamOidString, out var teamOid))
            {
                return LeerzeichenFuerGetMethoden;
            }

            var team = EmployeeService.FindTeamByOid(teamOid, Model.LoggedInEmployee.EmployeeOid.Value);

            if(team is null)
            {
                return LeerzeichenFuerGetMethoden;
            }

            Model.SelectedEmployeeOids.AddRangeIfElementsNotIn(team.Member.Select(m => m.EmployeeOid));
            
            UpdateSelectedObjects();

            return LeerzeichenFuerGetMethoden;
        }

        [Authorize]
        public ActionResult UpdateEmployeeSelection(string oidString)
        {
            if(Model is null)
            {
                TempData[TempDataConstants.DoLogoutKey] = true;
                Logout();
                return PartialView("SchedulerEmployeeSelectionPartial");
            }

            
            Model.SelectedEmployeeOids = ConvertOidStringToList(oidString);
            UpdateSelectedObjects();

            return PartialView("SchedulerEmployeeSelectionPartial", Model);
        }

        [Authorize]
        public ActionResult SelectAllEmployees(bool isChecked)
        {
            if(Model is null)
            {
                TempData[TempDataConstants.DoLogoutKey] = true;
                return PartialView("EmployeeSelectionPopupListPartial");
            }
            
            Model.SelectedEmployeeOids = isChecked ? Model.AllEmployees.Select(r => r.EmployeeOid).ToList() : new List<long>();

            UpdateSelectedObjects();

            return PartialView("EmployeeSelectionPopupListPartial", Model);
        }

        [Authorize]
        public ActionResult LoadUpdatedEmployees()
        {
            if (Model is null)
            {
                TempData[TempDataConstants.DoLogoutKey] = true;
                return PartialView("SchedulerEmployeeSelectionPartial");
            }

            return PartialView("SchedulerEmployeeSelectionPartial", Model);
        }

        [Authorize]
        public ActionResult LoadUpdatedEmployeePopupList()
        {
            if (Model is null)
            {
                TempData[TempDataConstants.DoLogoutKey] = true;
                return PartialView("EmployeeSelectionPopupListPartial");
            }

            return PartialView("EmployeeSelectionPopupListPartial", Model);
        }

        #endregion

        #region Klientenauswahl

        [Authorize]
        public ActionResult SelectAllCustomers(bool isChecked)
        {
            if(Model is null)
            {
                TempData[TempDataConstants.DoLogoutKey] = true;
                Logout();
                return PartialView("CustomerSelectionPopupListPartial");
            }
            
            Model.SelectedCustomerOids = isChecked ? Model.AllCustomers.Select(r => r.CustomerOid).ToList() : new List<long>();
            UpdateSelectedObjects();

            return PartialView("CustomerSelectionPopupListPartial", Model);
        }

        [Authorize]
        public ActionResult LoadUpdatedCustomers()
        {
            if (Model is null)
            {
                TempData[TempDataConstants.DoLogoutKey] = true;
                return PartialView("SchedulerCustomerSelectionPartial");
            }

            return PartialView("SchedulerCustomerSelectionPartial", Model);
        }

        [Authorize]
        public ActionResult LoadUpdatedCustomerPopupList()
        {
            if (Model is null)
            {
                TempData[TempDataConstants.DoLogoutKey] = true;
                return PartialView("CustomerSelectionPopupListPartial");
            }

            return PartialView("CustomerSelectionPopupListPartial", Model);
        }

        [Authorize]
        public ActionResult UpdateCustomerSelection(string oidString)
        {
            if(Model is null)
            {
                TempData[TempDataConstants.DoLogoutKey] = true;
                Logout();
                return PartialView("SchedulerCustomerSelectionPartial");
            }

            
            Model.SelectedCustomerOids = ConvertOidStringToList(oidString);

            UpdateSelectedObjects();

            return PartialView("SchedulerCustomerSelectionPartial", Model);
        }

        #endregion

        #region Ressourcenauswahl

        [Authorize]
        public ActionResult UpdateResourceSelection(string oidString)
        {
            if(Model is null)
            {
                TempData[TempDataConstants.DoLogoutKey] = true;
                return PartialView("SchedulerResourceSelectionPartial");
            }

            

            //var list = new List<ResourceDC>();

            //Model.ResourceCategories2Resources.Values.DoForEach(l => l.DoForEach(s => list.AddIfNotIn(s)));

            //Model.SelectedResources = list.Where(resource => resource.ResourceOid.HasValue && oidList.Contains(resource.ResourceOid.Value)).ToList();

            Model.SelectedResourceOids = ConvertOidStringToList(oidString);

            UpdateSelectedObjects();

            return PartialView("SchedulerResourceSelectionPartial", Model);
        }

        [Authorize]
        public ActionResult SelectAllResources(bool isChecked)
        {
            if(Model is null)
            {
                TempData[TempDataConstants.DoLogoutKey] = true;
                return PartialView("ResourceSelectionPopupListPartial");
            }

            Model.SelectedResourceOids = isChecked ? Model.AllResources.Select(r => r.ResourceOid.Value).ToList() : new List<long>();

            UpdateSelectedObjects();

            return PartialView("ResourceSelectionPopupListPartial", Model);
        }

        [Authorize]
        public ActionResult LoadUpdatedResourcePopupList()
        {
            if (Model is null)
            {
                TempData[TempDataConstants.DoLogoutKey] = true;
                return PartialView("ResourceSelectionPopupListPartial");
            }

            return PartialView("ResourceSelectionPopupListPartial", Model);
        }

        [Authorize]
        public ActionResult LoadUpdatedResources()
        {
            if (Model is null)
            {
                TempData[TempDataConstants.DoLogoutKey] = true;
                return PartialView("SchedulerResourceSelectionPartial");
            }

            return PartialView("SchedulerResourceSelectionPartial", Model);
        }
        #endregion



        [Authorize]
        public ActionResult FetchCustomersForFiltering()
        {
            if (Model is null)
            {
                TempData[TempDataConstants.DoLogoutKey] = true;
            }

            return PartialView("CustomerFilterSelectionPartial", Model);
        }

        [Authorize]
        public ActionResult FetchCustomerFilteringModalBody()
        {
            if (Model is null)
            {
                TempData[TempDataConstants.DoLogoutKey] = true;
            }

            return PartialView("CustomerFilteringModalContentPartial", Model);
        }

        [Authorize]
        public string SetShouldLoadTasks(bool isChecked)
        {
            try
            {
                if(Model is null)
                {
                    Logout();
                    return LeerzeichenFuerGetMethoden;
                }

                Model.ShouldLoadTasks = isChecked;

                return LeerzeichenFuerGetMethoden;
            }
            catch(Exception exception)
            {
                Log.Error(exception.Message, exception);
            }

            return LeerzeichenFuerGetMethoden;
        }

        [Authorize]
        public string DeleteAppointment(string appointmentIdentifier, bool deleteSeries)
        {
            
            if(Model?.LoggedInEmployee?.EmployeeOid is null)
            {
                Logout();
                return LeerzeichenFuerGetMethoden;
            }


            LoadAppointmentsForDate();

            var schedulerAppointment = Model.AppointmentListItems.FirstOrDefault(app => app.Identifier.Equals(appointmentIdentifier))?.SchedulerAppointment;
                
            if(schedulerAppointment is null)
            {
                return LeerzeichenFuerGetMethoden;
            }

            if(schedulerAppointment.SchedulerAppointmentOid is null && !(schedulerAppointment.RecurrenceInfo is null))
            {
                var recurrenceInfo = new RecurrenceInfo();
                recurrenceInfo.FromXml(schedulerAppointment.RecurrenceInfo);

                var pattern = StaticAppointmentFactory.CreateAppointment(AppointmentType.Pattern);
                pattern.RecurrenceInfo.FromXml(schedulerAppointment.RecurrenceInfo);
                pattern.Start = pattern.RecurrenceInfo.Start;
                pattern.End = pattern.RecurrenceInfo.End;

                var exception = pattern.CreateException(AppointmentType.DeletedOccurrence, schedulerAppointment.RecurrenceIndex);
                    
                var recurrenceId = exception.RecurrenceInfo.Id.ToString();

                schedulerAppointment = deleteSeries ? 
                    KalenderService.FindRootAppointmentByRecurrenceId(recurrenceId) : 
                    CloneAppointment(schedulerAppointment, $"<RecurrenceInfo Id=\"{recurrenceId}\" Index=\"{schedulerAppointment.RecurrenceIndex}\" />", (int)exception.Type);
            }

            if(schedulerAppointment is null)
            {
                return LeerzeichenFuerGetMethoden;
            }

            var teamMemberCustomerOids = EmployeeService.LoadTeamsRelatedCustomerOids(Model.LoggedInEmployee.EmployeeOid.Value);

            var customerList = schedulerAppointment.CustomerList;
            var employeeList = schedulerAppointment.EmployeeList;
            var resourceList = schedulerAppointment.ResourceList;
            var originator = schedulerAppointment.Originator;
            var isNew = schedulerAppointment.SchedulerAppointmentOid is null;
            var loggedOnUser = LoggedInUser;

            var isAllowedToDelete = BS.Shared.Core.Utils.CheckSchedulerRights(customerList, resourceList, employeeList, originator, isNew, SchedulerRightsCheckType.Edit, loggedOnUser, teamMemberCustomerOids);

            if(isAllowedToDelete)
            {
                if(schedulerAppointment.SchedulerAppointmentOid.HasValue && schedulerAppointment.NewSchedulerAppointmentVersion.HasValue)
                {
                    var oid2Version = new Dictionary<long, long> { { schedulerAppointment.SchedulerAppointmentOid.Value, schedulerAppointment.NewSchedulerAppointmentVersion.Value } };

                    KalenderService.DeactivateSchedulerAppointments(oid2Version);
                }

                // DeletedOccurrence
                if(schedulerAppointment.Type == 4 && !deleteSeries)
                {
                    KalenderService.InsertSchedulerAppointments(new List<SchedulerAppointmentDC> { schedulerAppointment });
                }
            }

            return LeerzeichenFuerGetMethoden;
        }

        [Authorize]
        public static SchedulerAppointmentDC CloneAppointment(SchedulerAppointmentDC schedulerAppointment, string recurrenceInfo, int type)
        {
            return new SchedulerAppointmentDC
            {
                StartDate                = schedulerAppointment.StartDate,
                EndDate                  = schedulerAppointment.EndDate,
                ServiceRecordList        = schedulerAppointment.ServiceRecordList ?? new List<ServiceRecordDC>(),
                EmployeeList             = schedulerAppointment.EmployeeList ?? new List<Employee2SchedulerAppointmentDC>(),
                ActivationType           = ActivationTypeId.Active,
                AllDay                   = schedulerAppointment.AllDay,
                CanBeEdited              = schedulerAppointment.CanBeEdited,
                CompletedDate            = schedulerAppointment.CompletedDate,
                CompletedNotice          = schedulerAppointment.CompletedNotice,
                CompletedUser            = schedulerAppointment.CompletedUser,
                CustomerList             = schedulerAppointment.CustomerList ?? new List<CompactCustomerDC>(),
                Description              = schedulerAppointment.Description?.RemoveUppercaseEsszett(),
                DueDate                  = schedulerAppointment.DueDate,
                FormerBookingSequenceOid = schedulerAppointment.FormerBookingSequenceOid,
                FormerTaskOid            = schedulerAppointment.FormerTaskOid,
                HasServiceRecordEntry    = schedulerAppointment.HasServiceRecordEntry,
                IsPrivate                = schedulerAppointment.IsPrivate,
                IsTask                   = schedulerAppointment.IsTask,
                IsTeilnahmeBestaetigung  = schedulerAppointment.IsTeilnahmeBestaetigung,
                LabelKey                 = schedulerAppointment.LabelKey,
                Location                 = schedulerAppointment.Location?.RemoveUppercaseEsszett(),
                Originator               = schedulerAppointment.Originator,
                RecurrenceInfo           = recurrenceInfo,
                ReminderInfo             = schedulerAppointment.ReminderInfo,
                ResourceList             = schedulerAppointment.ResourceList ?? new List<ResourceDC>(),
                Status                   = schedulerAppointment.Status,
                Subject                  = schedulerAppointment.Subject?.RemoveUppercaseEsszett() ?? string.Empty,
                SupportConceptList       = schedulerAppointment.SupportConceptList ?? new List<CompactSupportConceptDC>(),
                TaskDescription          = schedulerAppointment.TaskDescription,
                Type                     = type
            };
        }

        [Authorize]
        public string SelectTeamForIntervalFinder(string teamOidString)
        {
            if(Model?.LoggedInEmployee?.EmployeeOid is null)
            {
                Logout();
                return LeerzeichenFuerGetMethoden;
            }

            if(long.TryParse(teamOidString, out var teamOid))
            {
                var team = EmployeeService.FindTeamByOid(teamOid, Model.LoggedInEmployee.EmployeeOid.Value);

                if(!(team is null))
                {
                    var memberOids = team.Member.Select(member => member.EmployeeOid).ToList();
                    Model.SelectedEmployeeOidsForIntervalFinder.AddRangeIfElementsNotIn(memberOids);
                    return JsonConvert.SerializeObject(memberOids);
                }
            }

            return LeerzeichenFuerGetMethoden;
        }

        [Authorize]
        [HttpPost]
        public ActionResult TransformAppointmentToServiceRecord(FormCollection formCollection)
        {
            if(Model is null)
            {
                TempData[TempDataConstants.DoLogoutKey] = true;
                return Logout();
            }

            var identifier = formCollection[FormCollectionConstants.AppointmentIdInputKey];
            
            if (Model.AppointmentListItems == null)
            {
                LoadAppointmentsForDate();
            }
            var appointmentListItem = Model.AppointmentListItems.FirstOrDefault(f => f.Identifier.Equals(identifier));

            if(appointmentListItem is null)
            {
                return RedirectToActionPermanent("PrepareServiceRecordInsert", "Main");
            }

            var appointment = appointmentListItem.SchedulerAppointment;

            //var employeeOids = appointment.EmployeeList.Select(employee2Appointment => employee2Appointment.Employee.EmployeeOid).ToList();
            //if(employeeOids.Count == 0)
            //{
            //    employeeOids.Add(appointment.Originator.EmployeeOid);
            //}

            TempData[TempDataConstants.AppointmentOidKey] = appointmentListItem.SchedulerAppointment?.SchedulerAppointmentOid;


            return RedirectToActionPermanent("PrepareServiceRecordInsert", "Main");
        }

        [Authorize]
        public override string SaveCollapsibleStatus(bool isOpen, string identifier)
        {
            Model.Collapsibles2IsShown[identifier] = isOpen;

            return LeerzeichenFuerGetMethoden;
        }
    }
}