prs/prs.desktop/Components/Calendar/Calendar.xaml.cs

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Data;
using System.Windows.Media;
using System.Windows.Threading;
using Comal.Classes;
using InABox.Clients;
using InABox.Configuration;
using InABox.Core;
using InABox.DynamicGrid;
using InABox.Wpf;
using InABox.WPF;
using PRSDesktop.Grids;
using Selection = InABox.Core.Selection;
using SelectionChangedEventArgs = System.Windows.Controls.SelectionChangedEventArgs;

namespace PRSDesktop
{
    public partial class Calendar
    {

        private enum Suppress
        {
            Selector,  // Prevent the Selector from Being Changed
            Calendar,  // Prevent the Calendar from Being Reconfigured
            Events,    // Prevent the Selectors from Responding to Events 
            Refresh,   // Stop the Data from Being refreshed    
            Settings   // Dont allow settings to be updated
        }

        private EventSuppressor? suppressor = null;
        public void DisableUpdate()
        {
            suppressor ??= new EventSuppressor(Suppress.Refresh, Suppress.Settings);
        }

        public void EnableUpdate()
        {
            if (suppressor != null)
            {
                suppressor.Dispose();
                suppressor = null;
            }
        }

        #region Converters

        public static readonly IValueConverter DayOfWeekConverter = new FuncConverter<DateTime, string>(x => x.DayOfWeek.ToString());

        #endregion

        #region Dependency Properties

        #region HeaderVisibility Dependency Property

        public static readonly DependencyProperty HeaderVisibilityProperty =
            DependencyProperty.Register(
                nameof(HeaderVisibility), 
                typeof(Visibility), 
                typeof(Calendar), 
                new UIPropertyMetadata(Visibility.Collapsed)
            );
        
        public Visibility HeaderVisibility
        {
            get => (Visibility)GetValue(HeaderVisibilityProperty);
            set => SetValue(HeaderVisibilityProperty,value);
        }
        
        #endregion
        
        #region SettingsVisible Dependency Property
        
        public static readonly DependencyProperty SettingsVisibleProperty =
            DependencyProperty.Register(
                nameof(SettingsVisible), 
                typeof(CalendarSettingsVisibility), 
                typeof(Calendar), 
                new UIPropertyMetadata(CalendarSettingsVisibility.Disabled, SettingsVisible_Changed)
            );

        private static void SettingsVisible_Changed(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            if (d is not Calendar calendar) return;
            var value = (CalendarSettingsVisibility)e.NewValue;

            if (!EventSuppressor.IsSet(Suppress.Settings))
            {
                calendar.Properties.SettingsVisible = value;
                calendar.DoSaveSettings();
            }

            calendar._splitPanel.View = value == CalendarSettingsVisibility.Visible
                ? DynamicSplitPanelView.Combined
                : DynamicSplitPanelView.Master;
            calendar._splitPanel.AllowableViews = value == CalendarSettingsVisibility.Disabled
                ? DynamicSplitPanelView.Master
                : DynamicSplitPanelView.Master | DynamicSplitPanelView.Combined;
        }

        public CalendarSettingsVisibility SettingsVisible
        {
            get => (CalendarSettingsVisibility)GetValue(SettingsVisibleProperty);
            set => SetValue(SettingsVisibleProperty, value);
        }
        
        #endregion
        
        #region CalendarView Dependency Property
        
        public static readonly DependencyProperty CalendarViewProperty =
            DependencyProperty.Register(
                nameof(CalendarView), 
                typeof(CalendarViewType), 
                typeof(Calendar), 
                new UIPropertyMetadata(CalendarViewType.Day, CalendarView_Changed)
            );

        public CalendarViewType CalendarView
        {
            get => (CalendarViewType)GetValue(CalendarViewProperty);
            set => SetValue(CalendarViewProperty, value);
        }

        private static void CalendarView_Changed(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            if (d is not Calendar calendar) return;

            if (!EventSuppressor.IsSet(Suppress.Settings))
            {
                calendar.Properties.CalendarView = calendar.CalendarView;
                calendar.DoSaveSettings();
            }

            calendar.Refresh();
        }

        #endregion
        
        #region EmployeeSelector Dependency Property
        
        public static readonly DependencyProperty EmployeeSelectionProperty =
            DependencyProperty.Register(
                nameof(EmployeeSelection), 
                typeof(EmployeeSelectorData), 
                typeof(Calendar), 
                new UIPropertyMetadata(new EmployeeSelectorData(), EmployeeSelection_Changed)
            );

        public EmployeeSelectorData EmployeeSelection
        {
            get => (EmployeeSelectorData)GetValue(EmployeeSelectionProperty);
            set => SetValue(EmployeeSelectionProperty, value);
        }

        private static void EmployeeSelection_Changed(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            if (d is not Calendar calendar) return;

            if (!EventSuppressor.IsSet(Suppress.Settings))
            {
                calendar.Properties.EmployeeSelection = calendar.EmployeeSelection;
                calendar.DoSaveSettings();
            }

            calendar.EmployeeSelector.Selection = calendar.EmployeeSelection;
            calendar._employees = calendar.EmployeeSelector.GetEmployeeData((row, rosters) => row.ToObject<Employee>());
            calendar.ReloadColumns();
            calendar.Refresh();
        }
        
        private void EmployeeSelector_OnSelectionChanged(object sender, EmployeeSelectorSelectionChangedArgs args)
        {
            if (EventSuppressor.IsSet(Suppress.Events))
                return;
            EmployeeSelection = args.Selection;
        }
        
        #endregion
        
        #region EmployeeSettings Dependency Property
        
        public static readonly DependencyProperty EmployeeSettingsProperty =
            DependencyProperty.Register(
                nameof(EmployeeSettings), 
                typeof(EmployeeSelectorSettings), 
                typeof(Calendar), 
                new UIPropertyMetadata(new EmployeeSelectorSettings(), EmployeeSettings_Changed)
            );

        private static void EmployeeSettings_Changed(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            if (d is not Calendar calendar) return;

            if (!EventSuppressor.IsSet(Suppress.Settings))
            {
                calendar.Properties.EmployeeSelector = calendar.EmployeeSettings;
                calendar.DoSaveSettings();
            }
            calendar.EmployeeSelector.Settings = calendar.EmployeeSettings;
        }

        public EmployeeSelectorSettings EmployeeSettings
        {
            get => (EmployeeSelectorSettings)GetValue(EmployeeSettingsProperty);
            set => SetValue(EmployeeSettingsProperty, value);
        }
        
        private void EmployeeSelector_OnSettingsChanged(object sender, EmployeeSelectorSettingsChangedArgs args)
        {
            if (EventSuppressor.IsSet(Suppress.Events))
                return;
            EmployeeSettings = args.Settings;
        }

        #endregion
        
        #region TimeInterval DependencyProperty
        
        public static readonly DependencyProperty TimeIntervalProperty =
            DependencyProperty.Register(
                "TimeInterval", 
                typeof(CalendarTimeInterval), 
                typeof(Calendar),
                new PropertyMetadata(CalendarTimeInterval.FifteenMinutes, TimeInterval_Changed)
            );

        public CalendarTimeInterval TimeInterval
        {
            get => (CalendarTimeInterval)GetValue(TimeIntervalProperty);
            set => SetValue(TimeIntervalProperty, value);
        }

        private static void TimeInterval_Changed(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            if (d is not Calendar calendar) return;

            if (!EventSuppressor.IsSet(Suppress.Settings))
            {
                calendar.Properties.TimeInterval = calendar.TimeInterval;
                calendar.DoSaveSettings();
            }
            calendar.IntervalSelector.SelectedIndex = (int)calendar.TimeInterval;

            calendar.CalendarControl.RowInterval = TimeIntervalToTimeSpan(calendar.TimeInterval);
        }

        private void IntervalSelector_OnSelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (EventSuppressor.IsSet(Suppress.Events))
                return;
            TimeInterval = (CalendarTimeInterval)IntervalSelector.SelectedIndex;
        }

        private static TimeSpan TimeIntervalToTimeSpan(CalendarTimeInterval interval)
        {
            return interval switch
            {
                CalendarTimeInterval.FiveMinutes => new TimeSpan(0, 5, 0),
                CalendarTimeInterval.SixMinutes => new TimeSpan(0, 6, 0),
                CalendarTimeInterval.TenMinutes => new TimeSpan(0, 10, 0),
                CalendarTimeInterval.FifteenMinutes => new TimeSpan(0, 15, 0),
                CalendarTimeInterval.TwentyMinutes => new TimeSpan(0, 20, 0),
                CalendarTimeInterval.ThirtyMinutes => new TimeSpan(0, 30, 0),
                CalendarTimeInterval.SixtyMinutes or _ => new TimeSpan(1, 0, 0)
            };           
        }
        
        #endregion
        
        #region SelectedDate Dependency Property
        
        public static readonly DependencyProperty SelectedDateProperty =
            DependencyProperty.Register(
                nameof(SelectedDate), 
                typeof(DateTime), 
                typeof(Calendar), 
                new UIPropertyMetadata(DateTime.Today, SelectedDate_Changed)
            );

        public DateTime SelectedDate
        {
            get => (DateTime)GetValue(SelectedDateProperty);
            set => SetValue(SelectedDateProperty, value);
        }

        private static void SelectedDate_Changed(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            if (d is not Calendar calendar) return;

            if (!EventSuppressor.IsSet(Suppress.Settings))
            {
                calendar.Properties.Date = calendar.SelectedDate;
                calendar.DoSaveSettings();
            }

            calendar.Refresh();
        }

        public DateTime StartDate => (Properties?.CalendarView ?? CalendarViewType.Day) == CalendarViewType.Day
            ? SelectedDate
            : SelectedDate.StartOfWeek(DayOfWeek.Monday);

        public DateTime EndDate => Properties.CalendarView == CalendarViewType.Day
            ?  StartDate.AddDays(1)
            : Properties.CalendarView == CalendarViewType.WorkWeek
                ? StartDate.AddDays(5)
                : StartDate.AddDays(7);
        
        #endregion
        
        #region StartHour Dependency Properties
        
        public static readonly DependencyProperty StartHourProperty =
            DependencyProperty.Register(
                nameof(StartHour), 
                typeof(int), 
                typeof(Calendar), 
                new UIPropertyMetadata(6, StartHour_Changed, StartHour_Coerce)
            );

        private static object StartHour_Coerce(DependencyObject d, object baseValue)
        {
            if (d is not Calendar calendar || baseValue is not int value) return baseValue;

            return Math.Min(calendar.EndHour - 1, Math.Max(0, value));
        }

        public int StartHour
        {
            get => (int)GetValue(StartHourProperty);
            set => SetValue(StartHourProperty, value);
        }

        private static void StartHour_Changed(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            if (d is not Calendar calendar) return;

            if (!EventSuppressor.IsSet(Suppress.Settings))
            {
                calendar.Properties.StartHour = calendar.StartHour;
                calendar.DoSaveSettings();
            }
            calendar.StartTimeSelector.Text = FormatHour(calendar.StartHour);
            calendar.CalendarControl.StartHour = TimeSpan.FromHours(calendar.StartHour);
        }
        
        private void StartTimeSelector_Down_Click(object sender, RoutedEventArgs e)
        {
            if (EventSuppressor.IsSet(Suppress.Events))
                return;

            StartHour -= 1;
        }

        private void StartTimeSelector_Up_Click(object sender, RoutedEventArgs e)
        {
            if (EventSuppressor.IsSet(Suppress.Events))
                return;

            StartHour += 1;
        }
        
        #endregion
        
        #region End Hour Property
        
        public static readonly DependencyProperty EndHourProperty =
            DependencyProperty.Register(
                nameof(EndHour), 
                typeof(int), 
                typeof(Calendar), 
                new UIPropertyMetadata(18, EndHour_Changed, EndHour_Coerce)
            );

        public int EndHour
        {
            get => (int)GetValue(EndHourProperty);
            set => SetValue(EndHourProperty, value);
        }

        private static object EndHour_Coerce(DependencyObject d, object baseValue)
        {
            if (d is not Calendar calendar || baseValue is not int value) return baseValue;

            return Math.Max(calendar.StartHour + 1, Math.Min(24, value));
        }

        private static void EndHour_Changed(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            if (d is not Calendar calendar) return;

            if (!EventSuppressor.IsSet(Suppress.Settings))
            {
                calendar.Properties.EndHour = calendar.EndHour;
                calendar.DoSaveSettings();
            }
            calendar.FinishTimeSelector.Text = FormatHour(calendar.EndHour);
            calendar.CalendarControl.EndHour = TimeSpan.FromHours(calendar.EndHour);
        }
        
        private void FinishTimeSelector_Down_Click(object sender, RoutedEventArgs e)
        {
            if (EventSuppressor.IsSet(Suppress.Events))
                return;
            EndHour -= 1;
        }

        private void FinishTimeSelector_Up_Click(object sender, RoutedEventArgs e)
        {
            if (EventSuppressor.IsSet(Suppress.Events))
                return;
            EndHour += 1;
        }
        
        private static string FormatHour(int hour)
        {
            return hour <= 0 || hour >= 24
                ? "Midnight"
                : hour < 12
                    ? string.Format("{0}:00 AM", hour)
                    : hour > 12
                        ? string.Format("{0}:00 PM", hour)
                        : "12:00 NN";
        }
        
        #endregion       
        
        #region AssignmentType Dependency Property
        
        public static readonly DependencyProperty AssignmentTypeProperty =
            DependencyProperty.Register(
                nameof(AssignmentType), 
                typeof(CalendarAssignmentType), 
                typeof(Calendar), 
                new UIPropertyMetadata(CalendarAssignmentType.Booked, AssignmentType_Changed)
            );

        public CalendarAssignmentType AssignmentType
        {
            get => (CalendarAssignmentType)GetValue(AssignmentTypeProperty);
            set => SetValue(AssignmentTypeProperty, value);
        }

        private static void AssignmentType_Changed(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            if (d is not Calendar calendar) return;

            if (!EventSuppressor.IsSet(Suppress.Settings))
            {
                calendar.Properties.AssignmentType = calendar.AssignmentType;
                calendar.DoSaveSettings();
            }
            calendar.AssignmentTypeSelector.SelectedIndex = (int)calendar.AssignmentType;
            calendar.Refresh();
        }

        private void AssignmentTypeSelector_OnSelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (EventSuppressor.IsSet(Suppress.Events))
                return;
            using (new EventSuppressor(Suppress.Selector))
            {
                AssignmentType = (CalendarAssignmentType)AssignmentTypeSelector.SelectedIndex;
            }
        }
        
        #endregion
        
        #region BackgroundType Dependency Property
        
        public static readonly DependencyProperty BackgroundTypeProperty =
            DependencyProperty.Register(
                nameof(BackgroundType), 
                typeof(CalendarBackgroundType), 
                typeof(Calendar), 
                new UIPropertyMetadata(CalendarBackgroundType.Roster, BackgroundType_Changed)
            );

        public CalendarBackgroundType BackgroundType
        {
            get => (CalendarBackgroundType)GetValue(BackgroundTypeProperty);
            set => SetValue(BackgroundTypeProperty, value);
        }

        private static void BackgroundType_Changed(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            if (d is not Calendar calendar) return;

            if (!EventSuppressor.IsSet(Suppress.Settings))
            {
                calendar.Properties.BackgroundType = calendar.BackgroundType;
                calendar.DoSaveSettings();
            }
            calendar.BackgroundTypeSelector.SelectedIndex = (int)calendar.BackgroundType;
            calendar.Refresh();
        }

        private void BackgroundTypeSelector_OnSelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (EventSuppressor.IsSet(Suppress.Events))
                return;
            using (new EventSuppressor(Suppress.Selector))
                BackgroundType = (CalendarBackgroundType)BackgroundTypeSelector.SelectedIndex;
        }

        #endregion
        
        #region Zoom Dependency Properties
        
        public static readonly DependencyProperty ZoomProperty =
            DependencyProperty.Register(
                nameof(Zoom), 
                typeof(double), 
                typeof(Calendar), 
                new UIPropertyMetadata(100.0, Zoom_Changed, Zoom_Coerce)
            );

        private static object Zoom_Coerce(DependencyObject d, object baseValue)
        {
            if (baseValue is not double zoom) return baseValue;
            return Math.Max(zoom, 100.0);
        }

        public double Zoom
        {
            get => (double)GetValue(ZoomProperty);
            set => SetValue(ZoomProperty, value);
        }

        private static void Zoom_Changed(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            if (d is not Calendar calendar) return;

            calendar.CalendarControl.Zoom = calendar.Zoom / 100;
            calendar.ZoomSelector.Text = $"{calendar.Zoom:F0}%";
        }

        private void ZoomSelector_Down_Click(object sender, RoutedEventArgs e)
        {
            if (EventSuppressor.IsSet(Suppress.Events))
                return;
            ZoomOut();
        }
        
        private void ZoomSelector_Up_Click(object sender, RoutedEventArgs e)
        {
            if (EventSuppressor.IsSet(Suppress.Events))
                return;
            ZoomIn();
        }

        public void ZoomIn() => Zoom *= 1.125;
        public void ZoomOut() => Zoom /= 1.125;
        public void ResetZoom() => Zoom = 100;

        #endregion

        #endregion

        #region Event Handlers

        public event LoadSettings<CalendarSettings>? LoadSettings;
        
        public event SaveSettings<CalendarSettings>? SaveSettings;

        public CalendarConfigurationEvent? ConfigurationChanged;
        
        public event CalendarDataMenuEvent? CustomiseContextMenu;
        
        public event CalendarDataEvent? SelectionChanged;

        public event CalendarDataEvent? ItemCreated;        
        
        public event CalendarDataEvent? ItemChanged;

        public event CalendarHandledEvent? ItemEditing;
        
        #endregion

        public void SelectEmployee(Guid employeeid) => EmployeeSelector.SelectEmployee(employeeid);

        // Populated as requiew when EmployeeSelector.SelectionChanged is triggered
        private Employee[] _employees = [];

        // Populated once at startup
        private StandardLeave[] _standardleaves = [];
        private LeaveRequest[] _leaverequests = [];

        // Populated on each Refresh
        private TimeSheet[] _timesheets = [];

        // Populated on each Refresh
        private List<Assignment> _assignments = [];

        private ObservableCollection<ICalendarAppointment> _appointments = new();
        
        private bool bColumnsLoaded;
        
        private AssignmentGrid? ag;
        private LeaveRequestGrid? lg;
        private StandardLeaveGrid? slg;
        private DynamicDataGrid<Meeting>? mg;
        
        public bool IsReady { get; set; }

        public CalendarSettings Properties { get; set; } = new();

        public Calendar()
        {
            using (EventSuppressor.All<Suppress>())
            {
                InitializeComponent();

                _splitPanel.DataContext = this;

                StartHour = 0;
                EndHour = 24;
            }

            CalendarControl.GetFillBlockStart = GetFillBlockStart;
            CalendarControl.GetFillBlockEnd = GetFillBlockEnd;

            CalendarControl.RowInterval = TimeIntervalToTimeSpan(TimeInterval);
            CalendarViewSelector.ItemsSource = new List<KeyValuePair<CalendarViewType, string>>
            {
                new(CalendarViewType.Day, "Day"),
                new(CalendarViewType.WorkWeek, "Work Week"),
                new(CalendarViewType.Week, "Week"),
            };
            CalendarViewSelector.DisplayMemberPath = "Value";
            CalendarViewSelector.SelectedValuePath = "Key";
        }

        public virtual void Setup()
        {
            using (new EventSuppressor(Suppress.Settings, Suppress.Refresh, Suppress.Events))
            {
                Properties = LoadSettings?.Invoke(this) ?? new CalendarSettings();
                SettingsVisible = Properties.SettingsVisible;
                SelectedDate = Properties.AlwaysStartOnToday ? DateTime.Today : Properties.Date;
                StartHour = Properties.StartHour;
                EndHour = Properties.EndHour;
                TimeInterval = Properties.TimeInterval;
                AssignmentType = Properties.AssignmentType;
                BackgroundType = Properties.BackgroundType;
                CalendarView = Properties.CalendarView;
                Zoom = Properties.Zoom;
                EmployeeSelector.Setup();
                EmployeeSettings = Properties.EmployeeSelector;
                EmployeeSelection = Properties.EmployeeSelection;
                AlwaysTodayBox.IsChecked = Properties.AlwaysStartOnToday;

                ReloadColumns();
            }
        }
        
        public virtual void Shutdown(CancelEventArgs? cancel)
        {
        }

        private void DoSaveSettings()
        {
            SaveSettings?.Invoke(this, Properties);
        }
        
        private bool bFirst = true;
        
        public virtual void Refresh()
        {
            RefreshData(StartDate, EndDate);
        }

        private bool _refreshing = false;

        private void RefreshData(DateTime startDate, DateTime endDate)
        {
            if (EventSuppressor.IsSet(Suppress.Refresh))
                return;
            if (!_refreshing)
            {
                _refreshing = true;
                Dispatcher.BeginInvoke(() => DoRefreshData(startDate, endDate));
            }
        }

        private void DoRefreshData(DateTime startDate, DateTime endDate)
        {
            _refreshing = false;
            using (new WaitCursor())
            {
                if (!bColumnsLoaded)
                    ReloadColumns();

                var query = new MultiQuery();

                var empids = _employees.ToArray(x => x.ID);
                
                if (BackgroundType != CalendarBackgroundType.Roster)
                {
                    query.Add(
                        Filter<TimeSheet>.Where(x => x.EmployeeLink.ID).InList(empids)
                            .And(x => x.Date).IsGreaterThanOrEqualTo(startDate)
                            .And(x => x.Date).IsLessThanOrEqualTo(endDate)
                            .And(x=>x.LeaveRequestLink.ID).IsEqualTo(Guid.Empty)
                            .And(x=>x.StandardLeaveLink.ID).IsEqualTo(Guid.Empty),
                        TimeSheetModel.Columns
                    );
                }
                
                query.Add(
                    Filter<Assignment>.Where(x => x.EmployeeLink.ID).InList(empids)
                        .And(x => x.Date).IsGreaterThanOrEqualTo(startDate)
                        .And(x => x.Date).IsLessThanOrEqualTo(endDate),
                    AssignmentModel.Columns,
                    new SortOrder<Assignment>(x => x.EmployeeLink.ID).ThenBy(x => x.Date).ThenBy(x => x.Booked.Duration, SortDirection.Descending)
                );
                
                query.Add(
                    Filter<LeaveRequest>
                        .Where(x => x.Status).IsNotEqualTo(LeaveRequestStatus.Rejected)
                        .And(x => x.EmployeeLink.ID).InList(empids)
                        .And(x => x.From).IsLessThanOrEqualTo(endDate)
                        .And(x => x.To).IsGreaterThanOrEqualTo(startDate),
                    Columns.None<LeaveRequest>()
                        .Add(x => x.ID)
                        .Add(x => x.EmployeeLink.ID)
                        .Add(x => x.From)
                        .Add(x => x.FromTime)
                        .Add(x => x.To)
                        .Add(x => x.ToTime)
                        .Add(x => x.LeaveType.Description)
                        .Add(x => x.LeaveType.Color)
                        .Add(x => x.Status)
                        .Add(x => x.Notes));
                
                query.Add(
                    Filter<StandardLeave>
                        .Where(x => x.From).IsLessThanOrEqualTo(endDate)
                        .And(x => x.To).IsGreaterThanOrEqualTo(startDate),
                    Columns.None<StandardLeave>()
                        .Add(x => x.ID)
                        .Add(c => c.ID)
                        .Add(c => c.LeaveType.Description)
                        .Add(c => c.Name)
                        .Add(c => c.LeaveType.Color)
                        .Add(c => c.From)
                        .Add(c => c.FromTime)
                        .Add(c => c.To)
                        .Add(c => c.ToTime));
                
                query.Query();

                _timesheets = (BackgroundType == CalendarBackgroundType.Roster)
                    ? []
                    : query.Get<TimeSheet>().ToArray<TimeSheet>();

                _leaverequests = query.Get<LeaveRequest>().ToArray<LeaveRequest>();
                _assignments = query.Get<Assignment>().ToList<Assignment>();

                _standardleaves = query.Get<StandardLeave>().ToArray<StandardLeave>();
                
                LoadBackground();

                _appointments.Clear();
                LoadStandardLeaves(_appointments);
                LoadLeaveRequests(_appointments);
                LoadAssignments(_appointments);
 
                try
                {
                    CalendarControl.Dates = CoreUtils.Range(startDate, endDate, x => x.AddDays(1));
                    CalendarControl.ItemsSource = _appointments;
                }
                catch (Exception e)
                {
                    Logger.Send(LogType.Error, "", string.Format("*** Unknown Error: {0}\n{1}", e.Message, e.StackTrace));
                }

                bFirst = false;
            }
        }

        public EmployeeRosterItem? GetRoster(Guid employeeid, DateTime date)
        {
            var employee = _employees.FirstOrDefault(x => x.ID == employeeid);
            if (employee is null) return null;

            var roster = RosterUtils.GetRoster(EmployeeSelector.GetRoster(employeeid), employee.RosterStart, date);
            return roster;
        }

        public bool GetActiveWindow(Guid employeeid, DateTime date, ref TimeSpan start, ref TimeSpan finish)
        {
            var result = false;

            foreach (var assignment in _assignments.Where(a => (a.EmployeeLink.ID == employeeid) && (a.Date) == date))
            {
                result = true;
                var curstart = AssignmentType switch
                {
                    CalendarAssignmentType.Booked => assignment.Booked.Start,
                    CalendarAssignmentType.Actual => assignment.Actual.Start,
                    _ => Assignment.EffectiveTime(assignment.Actual.Start, assignment.Booked.Start)
                };
                
                var curfinish = AssignmentType switch
                {
                    CalendarAssignmentType.Booked => assignment.Booked.Finish,
                    CalendarAssignmentType.Actual => assignment.Actual.Finish,
                    _ => Assignment.EffectiveTime(
                            assignment.Actual.Finish, 
                            Assignment.EffectiveTime(assignment.Actual.Start, assignment.Booked.Start)
                            .Add(assignment.Booked.Duration)
                    )
                };
                
                start = start > curstart ? curstart : start;
                finish = finish < curfinish ? curfinish : finish;
            }

            if ((BackgroundType == CalendarBackgroundType.Roster) ||
                ((BackgroundType == CalendarBackgroundType.Automatic) && (date >= DateTime.Today)))
            {
                var employee = _employees.FirstOrDefault(x => x.ID == employeeid);
                if (employee != null)
                {
                    var roster = RosterUtils.GetRoster(EmployeeSelector.GetRoster(employeeid), employee.RosterStart, date);
                    if (roster != null)
                    {
                        var blocks = roster.GetBlocks(date, TimeSpan.MinValue, TimeSpan.MaxValue);
                        foreach (var block in blocks)
                        {
                            start = start > block.Start ? block.Start : start;
                            finish = finish < block.Finish ? block.Finish : finish;
                        }
                    }
                }
            }
            else
            {
                foreach (var timesheet in _timesheets.Where(t => (t.EmployeeLink.ID == employeeid) && (t.Date == date)))
                {
                    result = true;
                    var curstart = !timesheet.Approved.IsEmpty()
                        ? timesheet.ApprovedStart
                        : timesheet.Start;
                    var curfinish = !timesheet.Approved.IsEmpty()
                        ? timesheet.ApprovedFinish
                        : timesheet.Finish;
                    start = start > curstart ? curstart : start;
                    finish = finish < curfinish ? curfinish : finish;                   
                }                
            }
            
            return result;
        }

        public Assignment[] GetAssignments(Guid employeeid, DateTime date)
        {
            return _assignments.Where(a => (a.EmployeeLink.ID == employeeid) && (a.Date == date)).ToArray();
        }
        
        private void LoadBackground()
        {
            var regions = new ObservableCollection<CalendarRegion>();
            foreach (var employee in _employees)
            {
                for (var date = StartDate; date < EndDate; date = date.AddDays(1))
                {
                    if ((BackgroundType == CalendarBackgroundType.Roster) ||
                        ((BackgroundType == CalendarBackgroundType.Automatic) && (date >= DateTime.Today)))
                    {
                        var roster = RosterUtils.GetRoster(EmployeeSelector.GetRoster(employee.ID), employee.RosterStart, date);
                        if (roster != null)
                        {
                            var blocks = roster.GetBlocks(date, TimeSpan.FromSeconds(0), TimeSpan.FromDays(1));
                            foreach (var block in blocks)
                            {
                                regions.Add(new CalendarRegion
                                {
                                    Date = date,
                                    Column = employee,
                                    Start = block.Start,
                                    End = block.Finish,
                                    Background = Colors.Yellow.ToBrush(0.3)
                                });
                            }
                        }
                    }
                    else
                    {
                        foreach (var timesheet in _timesheets.Where(t => (t.EmployeeLink.ID == employee.ID) && (t.Date == date)))
                        {
                            var start = !timesheet.Approved.IsEmpty()
                                ? timesheet.ApprovedStart
                                : timesheet.Start;
                            var finish = !timesheet.Approved.IsEmpty()
                                ? timesheet.ApprovedFinish
                                : timesheet.Finish;
                            if(finish == default)
                            {
                                finish = TimeSpan.FromHours(24);
                            }
                            regions.Add(new CalendarRegion
                            {
                                Date = date,
                                Column = employee,
                                Start = start,
                                End = finish,
                                Background = (!timesheet.Approved.IsEmpty() ? Colors.LightGreen : Colors.LightSalmon).ToBrush(0.4),
                            });
                        } 
                    }
                }
            }

            CalendarControl.Regions = regions;
        }
        
        private void LoadStandardLeaves(IList<ICalendarAppointment> appointments)
        {
            for (var date = StartDate; date < EndDate; date = date.AddDays(1))
            {
                var leaves = _standardleaves.Where(x => 
                    (x.From <= date)
                    && (x.To.Add(x.ToTime) > date)
                ).ToArray();
                foreach (var leave in leaves)
                {
                    foreach (var employee in _employees)
                    {
                        var start = (date.Date == leave.From.Date) ? leave.FromTime : TimeSpan.FromSeconds(0);
                        var finish = (date.Date == leave.To.Date) ? leave.ToTime : TimeSpan.FromDays(1).Subtract(TimeSpan.FromSeconds(1));

                        var roster = RosterUtils.GetRoster(EmployeeSelector.GetRoster(employee.ID), employee.RosterStart, date);
                        if (roster != null)
                        {
                            var blocks = roster.GetBlocks(date, start, finish);
                            foreach (var block in blocks)
                            {
                                var appt = new StandardLeaveAppointment(leave, employee, block);
                                appointments.Add(appt);
                            }
                        }
                    }
                }
            }
        }

        private void LoadLeaveRequests(IList<ICalendarAppointment> appointments)
        {
            for (var date = StartDate; date < EndDate; date = date.AddDays(1))
            {
                var ids = _employees.ToArray(x => x.ID);

                var leaves = _leaverequests.Where(x => 
                    (x.From <= date) 
                    && (x.To.Add(x.ToTime) > date) 
                    && ids.Contains(x.EmployeeLink.ID) 
                ).ToArray();

                foreach (var leave in leaves)
                {
                    var employee = _employees.FirstOrDefault(x => x.ID == leave.EmployeeLink.ID);
                    if (employee is null) return;
                    
                    var roster = RosterUtils.GetRoster(EmployeeSelector.GetRoster(employee.ID), employee.RosterStart, date);
                    if (roster != null)
                    {
                        var start = (date.Date == leave.From.Date) ? leave.FromTime : TimeSpan.FromSeconds(0);
                        var finish = (date.Date == leave.To.Date) ? leave.ToTime : TimeSpan.FromDays(1).Subtract(TimeSpan.FromSeconds(1));
                        var blocks = roster.GetBlocks(date, start, finish);
                        foreach(var block in blocks)
                        {
                            appointments.Add(new LeaveRequestAppointment(leave, employee, block));
                        }
                    }
                }
            }
        }

        private HashSet<Assignment> _savingAssignments = new();
        
        private void LoadAssignment(Assignment assignment, IList<ICalendarAppointment> appointments)
        {
            var employee = _employees.FirstOrDefault(x => x.ID == assignment.EmployeeLink.ID);
            if (employee is null) return;

            var model = new AssignmentAppointment(assignment, employee, AssignmentType);
            model.OnUpdate += () =>
            {
                if (_savingAssignments.Add(assignment))
                {
                    Dispatcher.BeginInvoke(() =>
                    {
                        _savingAssignments.Remove(assignment);
                        Client.SaveAsync(assignment, "Edited by user").LogIfFail();
                    });
                }
            };
            model.EmployeeChanged += (o, e) =>
            {
                model.Employee = _employees.FirstOrDefault(x => x.ID == assignment.EmployeeLink.ID);
            };
            appointments.Add(model);
        }

        private void LoadAssignments(IList<ICalendarAppointment> appointments)
        {
            foreach (var assignment in _assignments)
                LoadAssignment(assignment, appointments);
        }
        
        public DataModel DataModel(Selection selection)
        {
            var ids = _assignments.Select(x => x.ID).ToArray();
            return new AutoDataModel<Assignment>(Filter<Assignment>.Where(x => x.ID).InList(ids));
        }

        private static T CheckGrid<T>([NotNull] ref T? grid) where T : new()
        {
            grid ??= new T();
            return grid;
        }

        private void ReloadColumns()
        {
            CalendarControl.Columns = _employees.OrderBy(x => x.Name);
            bColumnsLoaded = true;
        }

        #region Block

        private (TimeSpan Start, TimeSpan End)? GetFillBlock(DateTime date, object? column, TimeSpan time)
        {
            if (column is not Employee employee) return null;

            if ((BackgroundType == CalendarBackgroundType.Roster) ||
                ((BackgroundType == CalendarBackgroundType.Automatic) && (date >= DateTime.Today)))
            {
                var roster = RosterUtils.GetRoster(EmployeeSelector.GetRoster(employee.ID), employee.RosterStart, date);
                if (roster is null) return null;

                var blocks = roster.GetBlocks(date, TimeSpan.Zero, TimeSpan.FromDays(1));
                var block = blocks.FirstOrDefault(x => x.Start <= time && time <= x.Finish);
                if (block is null) return null;

                return (block.Start, block.Finish);
            }
            else
            {
                foreach (var timesheet in _timesheets.Where(t => (t.EmployeeLink.ID == employee.ID) && (t.Date == date)))
                {
                    var start = !timesheet.Approved.IsEmpty()
                        ? timesheet.ApprovedStart
                        : timesheet.Start;
                    var finish = !timesheet.Approved.IsEmpty()
                        ? timesheet.ApprovedFinish
                        : timesheet.Finish;
                    if(finish == default)
                    {
                        finish = TimeSpan.FromHours(24);
                    }
                    if(start <= time && time <= finish)
                    {
                        return (start, finish);
                    }
                } 

                return null;
            }
        }

        private TimeSpan? GetFillBlockStart(DateTime date, object? column, TimeSpan time)
        {
            var block = GetFillBlock(date, column, time);
            return block?.Start;
        }

        private TimeSpan? GetFillBlockEnd(DateTime date, object? column, TimeSpan time)
        {
            var block = GetFillBlock(date, column, time);
            return block?.End;
        }

        private void Calendar_BlockHeld(object sender, CalendarBlockEventArgs e)
        {
            OpenContextMenu(sender, e, false);
        }

        public enum ContextMenuItems
        {
            Create,
            Fill
        }

        public CalendarTimeSlot FillSlot(CalendarBlockEventArgs e, CalendarTimeSlot slot)
        {
            if(CalendarControl.GetEmptySpace(e.Point, out var start, out var end))
            {
                if(start is null || end is null)
                {
                    var block = GetFillBlock(e.Date, e.Column, CalendarControl.GetTime(e.Point));
                    return new(slot.EmployeeID, e.Date, start ?? block?.Start ?? e.Start, end ?? block?.End ?? e.End);
                }
                else
                {
                    return new(slot.EmployeeID, e.Date, start.Value, end.Value);
                }
            }
            else
            {
                return slot;
            }
        }
        private void Calendar_BlockRightClicked(object sender, CalendarBlockEventArgs e)
        {
            OpenContextMenu(sender, e, true);
        }

        private void OpenContextMenu(object sender, CalendarBlockEventArgs e, bool allowFill)
        {
            object? value;
            if(e.Value is AssignmentAppointment appointment)
            {
                if (appointment.Model.Meeting.Link.ID != Guid.Empty)
                {
                    e.Menu.AddItem("Edit Meeting", null, appointment.Model, EditMeeting);
                }
                else
                {
                    e.Menu.AddItem("Edit Assignment", null, appointment.Model, EditAssignment);
                    e.Menu.AddSeparator();
                    e.Menu.AddItem("Copy Assignment", null, appointment.Model, CopyAssignment);
                    e.Menu.AddSeparator();
                    e.Menu.AddItem("Fill Available Time", null, () =>
                    {
                        if(CalendarControl.GetEmptySpace(e.Point, out var start, out var end, time: e.Start, exclude: [appointment]))
                        {
                            var time = AssignmentType switch
                            {
                                CalendarAssignmentType.Automatic or CalendarAssignmentType.Actual => appointment.Model.Actual,
                                CalendarAssignmentType.Booked => appointment.Model.Booked,
                                _ => throw new InvalidEnumException<CalendarAssignmentType>(AssignmentType)
                            };
                            if(start is null || end is null)
                            {
                                var block = GetFillBlock(e.Date, e.Column, e.Start);
                                time.Start = start ?? block?.Start ?? time.Start;
                                time.Finish = end ?? block?.End ?? time.Finish;
                            }
                            else
                            {
                                time.Start = start.Value;
                                time.Finish = end.Value;
                            }
                            Client.Save(appointment.Model, "Adjusted to fill time");
                        }
                    });
                }
                e.Menu.AddSeparatorIfNeeded();
            
                CreateDigitalFormsMenu(e.Menu, appointment);

                e.Menu.AddSeparatorIfNeeded();
                if (appointment.Model.Meeting.Link.ID != Guid.Empty)
                {
                    e.Menu.AddItem("Delete Meeting", null, appointment.Model, DeleteMeeting);
                }
                else
                {
                    e.Menu.AddItem("Delete Assignment", null, appointment.Model, DeleteAssignment);
                }

                value = appointment.Model;
            }
            else if(e.Value is LeaveRequestAppointment leaveAppointment)
            {
                if (Security.CanView<LeaveRequest>())
                {
                    e.Menu.AddItem(
                        Security.CanEdit<LeaveRequest>() ? "Edit Leave" : "View Leave",
                        null,
                        leaveAppointment.Model,
                        EditLeave);
                }

                value = leaveAppointment.Model;
            }
            else if(e.Value is StandardLeaveAppointment standardLeaveAppointment)
            {
                if (Security.CanView<StandardLeave>())
                {
                    e.Menu.AddItem(
                        Security.CanEdit<StandardLeave>() ? "Edit Standard Leave" : "View Standard Leave",
                        null,
                        standardLeaveAppointment.Model,
                        EditStandardLeave);
                }

                value = standardLeaveAppointment.Model;
            }
            else if (e.Value is null)
            {
                if (e.Column is not Employee employee) return;

                var slot = new CalendarTimeSlot(employee.ID, e.Date, e.Start, e.End);

                var createmenu = e.Menu.AddItem("Create...", null, null)
                    .WithName($"Menu_{nameof(ContextMenuItems.Create)}");
                createmenu.AddItem("New Assignment", null, slot, slot => CreateAssignment(slot));
                // createmenu.AddItem("New Meeting", null, slot, CreateMeeting);

                if (allowFill)
                {
                    var fillMenu = e.Menu.AddItem("Fill...", null, null)
                        .WithName($"Menu_{nameof(ContextMenuItems.Fill)}");
                    fillMenu.AddItem("New Assignment", null, () => CreateAssignment(FillSlot(e, slot)));
                    // fillMenu.AddItem("New Meeting", null, () => CreateMeeting(FillSlot(e, slot)));
                }

                if (_copiedmodel != null)
                {
                    e.Menu.AddSeparator();
                    e.Menu.AddItem("Paste Assignment", null, slot, slot => PasteAssignment(slot, _copiedmodel));
                }

                value = slot;
            }
            else
            {
                value = null;
            }

            e.Menu.AddSeparatorIfNeeded();

            e.Menu.AddItem("Zoom In", null, ZoomIn);
            e.Menu.AddItem("Zoom Out", null, ZoomOut, enabled: Zoom > 100);
            e.Menu.AddItem("Reset Zoom", null, ResetZoom);

            CustomiseContextMenu?.Invoke(e.Menu, new CalendarDataMenuEventArgs(value, e));
        }
        
        private static void CreateDigitalFormsMenu(ContextMenu menu, AssignmentAppointment appointment)
        {
            var digitalForms = menu.AddItem("Digital Forms", null, null);
            DynamicGridUtils.PopulateFormMenu<AssignmentForm, Assignment, AssignmentLink>(
                digitalForms,
                appointment.Model.ID,
                () => new Client<Assignment>().Load(Filter<Assignment>.Where(x => x.ID).IsEqualTo(appointment.Model.ID)).First(),
                false);
        }

        public void CreateMeeting(CalendarTimeSlot slot)
        {
            var meeting = new Meeting
            {
                Date = slot.Date
            };

            meeting.Time.Start = slot.Start;
            meeting.Time.Finish = slot.End;
            
            ItemCreated?.Invoke(this, new CalendarDataEventArgs(meeting));
            
            var args = new CalendarHandledEventArgs<Meeting>(meeting);
            ItemEditing?.Invoke(this, args);
            
            if (args.Status == CalendarHandledStatus.Cancel)
                return;
            if (args.Status == CalendarHandledStatus.Handled)
            {
                Refresh();
                return;
            }
            CheckGrid(ref mg);
            var items = new[] { meeting };
            bool bOK = mg.EditItems(
                items, 
                (type) =>
                {
                    if (type == typeof(Assignment))
                        return LoadMeetingEmployees(slot.EmployeeID);
                    else if (type == typeof(MeetingItem))
                        return LoadMeetingItems();
                    return null;
                }, 
                true
            );
            if (bOK)
                Refresh();
        }

        private static CoreTable LoadMeetingEmployees(Guid employeeid)
        {
            var result = new CoreTable();
            result.LoadColumns(typeof(Assignment));
            var assignment = new Assignment();
            LookupFactory.DoLookup<Assignment, Employee, EmployeeLink>(assignment, x => x.EmployeeLink, employeeid);
            result.LoadRows([assignment]);
            return result;
        }

        private static CoreTable LoadMeetingItems()
        {
            var result = new CoreTable();
            result.LoadColumns(typeof(MeetingItem));
            return result;
        }

        private void EditMeeting(Assignment model)
        {
            CheckGrid(ref mg);
            
            if (DynamicGridUtils.EditEntity<Meeting>(model.Meeting.Link.ID, out var meeting))
            {
                ItemChanged?.Invoke(this, new CalendarDataEventArgs(meeting));
                Refresh();
            }
        }
        
        private void DeleteMeeting(Assignment model)
        {
            if (!MessageWindow.ShowYesNo("Are you sure you wish to delete this meeting?", "Confirm Delete"))
                return;
            
            var meeting = new Meeting { ID = model.Meeting.Link.ID };
            Client.Delete(meeting, "Meeting Deleted from Scheduler");
            ItemChanged?.Invoke(this, new CalendarDataEventArgs(meeting));
            Refresh();
            SelectionChanged?.Invoke(this, new CalendarDataEventArgs(null));
        }
        
        public Assignment? CreateAssignment(CalendarTimeSlot slot)
        {
            var ass = new Assignment
            {
                Date = slot.Date
            };

            ass.Booked.Start = slot.Start;
            ass.Booked.Finish = slot.End;
            if ((AssignmentType == CalendarAssignmentType.Actual) || ((AssignmentType == CalendarAssignmentType.Automatic) && (ass.Date <= DateTime.Today)))
            {
                ass.Actual.Start = ass.Booked.Start;
                ass.Actual.Finish = ass.Booked.Finish;
            }
            
            ass.EmployeeLink.ID = slot.EmployeeID;

            ItemCreated?.Invoke(this, new CalendarDataEventArgs(ass));
            
            var args = new CalendarHandledEventArgs<Assignment>(ass);
            ItemEditing?.Invoke(this, args);
            if (args.Status == CalendarHandledStatus.Cancel)
                return null;
            
            if ((args.Status == CalendarHandledStatus.Handled) || CheckGrid(ref ag).EditItems([ass]))
            {
                _assignments.Add(ass);
                LoadAssignment(ass, _appointments);
                _copiedmodel = null;
            }

            return ass;

        }

        private void EditAssignment(Assignment model)
        {
            var grid = CheckGrid(ref ag);
            Client.EnsureColumns(model, grid.LoadEditorColumns());

            if (DynamicGridUtils.EditEntity<Assignment>(model))
            {
                ItemChanged?.Invoke(this, new CalendarDataEventArgs(model));
                // Refresh();
            }
        }

        private void DeleteAssignment(Assignment model)
        {
            if (!MessageWindow.ShowYesNo("Are you sure you wish to delete this assignment?", "Confirm Delete"))
                return;
            
            var ass = new Assignment { ID = model.ID };
            Client.Delete(ass, "Assignment Deleted from Scheduler");
            ItemChanged?.Invoke(this, new CalendarDataEventArgs(ass));
            Refresh();
            SelectionChanged?.Invoke(this, new CalendarDataEventArgs(null));

        }
        
        private Assignment? _copiedmodel;

        private void CopyAssignment(Assignment model)
        {
            _copiedmodel = model;
        }

        private Assignment PasteAssignment(CalendarTimeSlot slot, Assignment copied)
        {
            var ass = copied.Clone();

            ass.Date = slot.Date;
            ass.ID = Guid.Empty;
            ass.Number = 0;
            ass.CommitChanges();

            ass.Booked.Start = slot.Start;
            ass.Booked.Finish = slot.End;
            if ((AssignmentType == CalendarAssignmentType.Actual) || ((AssignmentType == CalendarAssignmentType.Automatic) && (ass.Date <= DateTime.Today)))
            {
                ass.Actual.Start = ass.Booked.Start;
                ass.Actual.Finish = ass.Booked.Finish;
            }
            
            ass.EmployeeLink.ID = slot.EmployeeID;
            ass.EmployeeLink.Clear();

            Client.Save(ass, "");

            _assignments.Add(ass);
            LoadAssignment(ass, _appointments);
            _copiedmodel = null;
            return ass;

        }

        private void EditLeave(LeaveRequest model)
        {
            var grid = CheckGrid(ref lg);
            Client.EnsureColumns(model, grid.LoadEditorColumns());

            if (DynamicGridUtils.EditEntity(model))
            {
                ItemChanged?.Invoke(this, new CalendarDataEventArgs(model));
                Refresh();
            }
        }

        private void EditStandardLeave(StandardLeave model)
        {
            var grid = CheckGrid(ref slg);
            Client.EnsureColumns(model, grid.LoadEditorColumns());

            if (DynamicGridUtils.EditEntity(model))
            {
                ItemChanged?.Invoke(this, new CalendarDataEventArgs(model));
                Refresh();
            }
        }

        private void Calendar_BlockClicked(object sender, CalendarBlockEventArgs e)
        {
            if(e.Value is AssignmentAppointment appointment)
            {
                var args = new CalendarDataEventArgs(appointment.Model);
                SelectionChanged?.Invoke(this, args);
            }
            else
            {
                SelectionChanged?.Invoke(this, new CalendarDataEventArgs(null));
            }
        }

        #endregion

        #region Layout

        private void _settingsButton_OnClick(object sender, RoutedEventArgs e)
        {
            _splitPanel.View = DynamicSplitPanelView.Master;
        }

        private void _splitPanel_OnOnChanged(object sender, DynamicSplitPanelSettings e)
        {
            if (EventSuppressor.IsSet(Suppress.Events))
                return;
            if (e.View == DynamicSplitPanelView.Combined && SettingsVisible != CalendarSettingsVisibility.Visible)
                SettingsVisible = CalendarSettingsVisibility.Visible;
            else if (e.View == DynamicSplitPanelView.Master && SettingsVisible == CalendarSettingsVisibility.Visible)
                SettingsVisible = CalendarSettingsVisibility.Hidden;
        }

        #endregion

        private void TextBlock_SizeChanged(object sender, SizeChangedEventArgs e)
        {
            if (sender is not TextBlock block || block.Tag is not Employee employee) return;

            var display = employee.Name;
            var comps = employee.Name.Split(' ');

            if(block.ActualWidth < 75)
            {
                display = (comps[0].Length > 0 ? comps[0][..1] : "")
                    + (comps.Length > 1 ? comps.Skip(1).First()[..1].ToUpper() : "");
            }
            else if(block.ActualWidth < 150)
            {
                display = comps.First() + " " + (comps.Length > 1 ? comps.Skip(1).First()[..1].ToUpper() : "");
            }
            block.Text = display;
        }

        #region Date Selection

        private void Left_Click(object sender, RoutedEventArgs e)
        {
            SelectedDate = SelectedDate.AddDays(CalendarView switch
            {
                CalendarViewType.Day => -1,
                CalendarViewType.WorkWeek or CalendarViewType.Week => -7,
                _ => throw new InvalidEnumException<CalendarViewType>(CalendarView)
            });
        }

        private void Right_Click(object sender, RoutedEventArgs e)
        {
            SelectedDate = SelectedDate.AddDays(CalendarView switch
            {
                CalendarViewType.Day => 1,
                CalendarViewType.WorkWeek or CalendarViewType.Week => 7,
                _ => throw new InvalidEnumException<CalendarViewType>(CalendarView)
            });
        }

        private void Today_Click(object sender, RoutedEventArgs e)
        {
            SelectedDate = DateTime.Today;
        }

        private void AlwaysTodayBox_Checked(object sender, RoutedEventArgs e)
        {
            if (EventSuppressor.IsSet(Suppress.Events)) return;

            Properties.AlwaysStartOnToday = AlwaysTodayBox.IsChecked == true;
            DoSaveSettings();
        }

        #endregion
    }
}