using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Threading;
using com.sun.jmx.mbeanserver;
using Comal.Classes;
using InABox.Clients;
using InABox.Configuration;
using InABox.Core;
using InABox.DynamicGrid;
using InABox.WPF;
using Syncfusion.UI.Xaml.Scheduler;
using Action = System.Action;
using SelectionChangedEventArgs = System.Windows.Controls.SelectionChangedEventArgs;

namespace PRSDesktop
{
    
    public partial class AssignmentView2 : UserControl
    {
        #region Private Fields
        
        private class AssignmentViewModel : ScheduleAppointment, IAssignmentViewModel
        {
            public Guid AssignmentID { get; set; }
            public Guid EmployeeID { get; set; }
            public Brush AppointmentForeground { get; set; }
            public int Number { get; set; }
            public string JobNumber { get; set; }
            public BitmapImage Completed { get; set; }
            public BitmapImage HasDelivery { get; set; }
            public BitmapImage Locked { get; set; }
            public BitmapImage TimeSheet { get; set; }
        }
        
        
        private readonly BitmapImage back = PRSDesktop.Resources.back.AsBitmapImage(32, 32);
        private readonly BitmapImage box = PRSDesktop.Resources.box_sml.AsBitmapImage(32, 32);
        private readonly BitmapImage first = PRSDesktop.Resources.first.AsBitmapImage(32, 32);
        private readonly BitmapImage last = PRSDesktop.Resources.last.AsBitmapImage(32, 32);
        private readonly BitmapImage locked = PRSDesktop.Resources.lock_sml.AsBitmapImage(32, 32);
        private readonly BitmapImage next = PRSDesktop.Resources.next.AsBitmapImage(32, 32);
        private readonly BitmapImage tick = PRSDesktop.Resources.tick_sml.AsBitmapImage(32, 32);
        private readonly BitmapImage timesheet = PRSDesktop.Resources.clock_sml.AsBitmapImage(32, 32);
        
        private bool bReady = false;

        private Dictionary<Guid, String> _teams = new Dictionary<Guid, string>() { { CoreUtils.FullGuid, "All Teams" } };
        private CoreTable _employees = new CoreTable(typeof(EmployeeTeam));
        private CoreTable _assignments  = new CoreTable(typeof(Assignment));
        
        private Guid _selectedassignment = Guid.Empty;
        private DateTime _selecteddate = DateTime.MinValue;
        private Guid _selectedteam = Guid.Empty;
        private Guid[] _selectedemployees = new Guid[] { };
        private double _zoom = 100.0D;
        private bool _sidebaropen = false;
        
        private AssignmentGrid _assignmentgrid = null;
        
        #endregion
        
        #region Events
        
        public event CustomiseAssignments CustomiseAssignments;

        public event CustomiseAssignmentsContextMenu CustomiseContextMenu;
        
        public event AssignmentSelectionChangedEvent AssignmentSelectionChanged;

        public event AssignmentChangedEvent AssignmentChanged;

        public event AssignmentViewSettingsChanged SettingsChanged;
        
        #endregion
        
        public AssignmentView2()
        {
            
            InitializeComponent();
            Loaded += OnLoaded;

            PrevMonth.Content = new Image { Source = first };
            PrevDay.Content = new Image { Source = back };
            NextDay.Content = new Image { Source = next };
            NextMonth.Content = new Image { Source = last };
        }

        private void OnLoaded(object sender, RoutedEventArgs args)
        {
            Loaded -= OnLoaded;
            UpdateUI(UpdateDateVisible);
            UpdateUI(UpdateCanShowHideSideBar);
            UpdateUI(UpdateTimeInterval);
            UpdateUI(UpdateStartHour);
            UpdateUI(UpdateEndHour);
            UpdateUI(UpdateWorkingHourColors);
        }

        #region Settings

        private void DoSettingsChanged()
        {
            var settings = new AssignmentViewSettings()
            {
                SelectedDate = this.SelectedDate,
                SelectedTeam = this.SelectedTeam,
                SelectedEmployees = this.SelectedEmployees,
                Zoom = this.Zoom,
                SideBarOpen = this.SideBarOpen
            };
            SettingsChanged?.Invoke(this, settings);
        }
        
        #endregion
        
        #region Public Properties
        
        public DateTime SelectedDate
        {
            get => _selecteddate;
            set
            {
                if (value != _selecteddate)
                {
                    _selecteddate = value;
                    UpdateUI(UpdateSelectedDate);
                    DoSettingsChanged();
                }
            }
        }
        
        public Guid SelectedTeam
        {
            get => _selectedteam;
            set
            {
                if (value != _selectedteam)
                {
                    _selectedteam = value;
                    UpdateUI(UpdateSelectedTeam);
                    DoSettingsChanged();
                }
            }
        }
        
        public Guid[] SelectedEmployees
        {
            get => _selectedemployees;
            set
            {
                if (new HashSet<Guid>(value).SetEquals(_selectedemployees) == false)
                {
                    _selectedemployees = value;
                    UpdateUI(UpdateSelectedEmployees);
                    DoSettingsChanged();
                }
            }
        }
        
        public double Zoom
        {
            get => _zoom;
            set
            {
                if (Math.Abs(value - _zoom) > 0.001D)
                {
                    _zoom = value;
                    UpdateUI(UpdateZoom);
                    DoSettingsChanged();
                }
            }
        }

        public bool SideBarOpen
        {
            get => _sidebaropen;
            set
            {
                if (value != _sidebaropen)
                {
                    _sidebaropen = value;
                    UpdateUI(UpdateSideBarOpen);
                    DoSettingsChanged();
                }
            }
        }
        
        public int StartHour
        {
            get => (int)GetValue(StartHourProperty);
            set
            {
                if (value != StartHour)
                {
                    SetValue(StartHourProperty, value);
                    UpdateUI(UpdateStartHour);
                }
            }
        }
        
        public int EndHour
        {
            get => (int)GetValue(EndHourProperty);
            set
            {
                if (value != EndHour)
                {
                    SetValue(EndHourProperty, value);
                    UpdateUI(UpdateEndHour);
                }
            }
        }
        
        public Color WorkingHourColor
        {
            get => (Color)GetValue(WorkingHourColorProperty);
            set
            {
                if (!Color.Equals(value, WorkingHourColor))
                {
                    SetValue(WorkingHourColorProperty, value);
                    UpdateUI(UpdateWorkingHourColors);
                }
            }
        }
        
        public Color NonWorkingHourColor
        {
            get => (Color)GetValue(NonWorkingHourColorProperty);
            set
            {
                if (Color.Equals(value, NonWorkingHourColor))
                {
                    SetValue(NonWorkingHourColorProperty, value);
                    UpdateUI(UpdateWorkingHourColors);
                }
            }
        }
        
        public AssignmentViewTimeInterval TimeInterval
        {
            get => (AssignmentViewTimeInterval)GetValue(TimeIntervalProperty);
            set
            {
                if (value != TimeInterval)
                {
                    SetValue(TimeIntervalProperty, value);
                    UpdateUI(UpdateTimeInterval);
                }
            }
        }
        
        public bool CanShowHideSideBar
        {
            get => (bool)GetValue(CanShowHideSideBarProperty);
            set
            {
                if (value != CanShowHideSideBar)
                {
                    SetValue(CanShowHideSideBarProperty, value);
                    UpdateUI(UpdateCanShowHideSideBar);
                }
            }
        }
        
        public bool DateVisible
        {
            get => (bool)GetValue(DateVisibleProperty);
            set
            {
                if (value != DateVisible)
                {
                    SetValue(DateVisibleProperty, value);
                    UpdateUI(UpdateDateVisible);
                }
            }
        }
        
        
        
        #endregion 
        
        #region Dependency Properties
        
        public static readonly DependencyProperty StartHourProperty =
            DependencyProperty.Register(
                "StartHour", 
                typeof(int), 
                typeof(AssignmentView2),
                new PropertyMetadata(6)
            );
        
        public static readonly DependencyProperty EndHourProperty =
            DependencyProperty.Register(
                "EndHour", 
                typeof(int), 
                typeof(AssignmentView2),
                new PropertyMetadata(18)
            );
        
        public static readonly DependencyProperty WorkingHourColorProperty =
            DependencyProperty.Register(
                "WorkingHourColor", 
                typeof(Color), 
                typeof(AssignmentView2), 
                new PropertyMetadata(Colors.Transparent) 
            );
        
        public static readonly DependencyProperty NonWorkingHourColorProperty =
            DependencyProperty.Register(
                "NonWorkingHourColor", 
                typeof(Color), 
                typeof(AssignmentView2),
                new PropertyMetadata(Colors.Gainsboro)
            );
        
        public static readonly DependencyProperty TimeIntervalProperty =
            DependencyProperty.Register(
                "TimeInterval", 
                typeof(AssignmentViewTimeInterval), 
                typeof(AssignmentView2),
                new PropertyMetadata(AssignmentViewTimeInterval.FifteenMinutes)
            );

        public static readonly DependencyProperty CanShowHideSideBarProperty =
            DependencyProperty.Register(
                "CanShowHideSideBar", 
                typeof(bool), 
                typeof(AssignmentView2),
                new PropertyMetadata(true)
            );        
        
        public static readonly DependencyProperty DateVisibleProperty =
            DependencyProperty.Register(
                "DateVisible", 
                typeof(bool), 
                typeof(AssignmentView2),
                new PropertyMetadata(true)
            );
        
        #endregion
        
        #region UI Sync Stuff
        
        // These functions should "push" property values to the UI
        // They should _not_ update the properties themselves
        // to avoid circular updates

        private bool _updatingUI = false;

        private void UpdateUI(Action action)
        {
            _updatingUI = true;
            try
            {
                action?.Invoke();
            }
            finally
            {
                _updatingUI = false;
            }            
        }
        
        private void UpdateStartHour()
        {
            StartTime.Value = new TimeSpan(StartHour, 0, 0);
            StartAMPM.Content = StartHour < 12 ? " AM " : StartHour > 12 ? " PM " : " NN ";
            UpdateWorkingHourColors();
            Bookings.SelectedDate = _selecteddate.Date;
            var margin = IntervalToTimeSpan(TimeInterval);
            var start = new TimeSpan(StartHour, 0, 0);
            if (start >= margin)
                start -= margin;
            Bookings.DisplayDate = _selecteddate.Add(start);
        }        
        
        private void UpdateEndHour()
        {
            EndTime.Value = new TimeSpan(EndHour, 0, 0);
            EndAMPM.Content = EndHour < 12 ? " AM " : EndHour > 12 ? " PM " : " NN ";
            UpdateWorkingHourColors();
        }
        
        private void UpdateWorkingHourColors()
        {
            
            if (Bookings.ResourceCollection == null)
                return;
            
            var resources = Bookings.ResourceCollection.OfType<SchedulerResource>();
            if (!resources.Any())
                return;
            
            var regions = new ObservableCollection<SpecialTimeRegion>();
            foreach (var resource in resources)
            {
                if (StartHour > 0)
                {
                    var before = new SpecialTimeRegion
                    {
                        StartTime = SelectedDate.Date,
                        EndTime = SelectedDate.Date.AddHours(StartHour),
                        ResourceIdCollection = new ObservableCollection<object> { resource.Id },
                        Background = new SolidColorBrush(NonWorkingHourColor),
                        Foreground = new SolidColorBrush(Colors.Black),
                        CanMergeAdjacentRegions = true
                    };
                    regions.Add(before);
                }

                if (EndHour < 24)
                {
                    var after = new SpecialTimeRegion
                    {
                        StartTime = SelectedDate.Date.AddHours(EndHour),
                        EndTime = SelectedDate.Date.AddDays(1).AddMilliseconds(-1),
                        ResourceIdCollection = new ObservableCollection<object> { resource.Id },
                        Background = new SolidColorBrush(NonWorkingHourColor),
                        Foreground = new SolidColorBrush(Colors.Black),
                        CanMergeAdjacentRegions = true
                    };
                    regions.Add(after);
                }

                if (StartHour < EndHour)
                {
                    var working = new SpecialTimeRegion
                    {
                        StartTime = SelectedDate.Date.AddHours(StartHour),
                        EndTime = SelectedDate.Date.AddHours(EndHour),
                        ResourceIdCollection = new ObservableCollection<object> { resource.Id },
                        Background = new SolidColorBrush(WorkingHourColor),
                        Foreground = new SolidColorBrush(Colors.Black),
                        CanMergeAdjacentRegions = true
                    };
                    regions.Add(working);
                }
            }

            Bookings.DaysViewSettings.SpecialTimeRegions = regions;
        }
        
        private void UpdateSelectedTeam()
        {
            Teams.SelectedValue = SelectedTeam;
            LoadEmployees();
        }
        
        private void UpdateTimeInterval()
        {
            try
            {
                Bookings.DaysViewSettings.TimeInterval = IntervalToTimeSpan(TimeInterval);
            }
            catch (Exception e)
            {
                // If the view is invisible, setting the time interval throws an exeception (internal scroll viewer is still set to null)
                // So we only want to log an error if the view is actually visible
                if (Bookings.IsVisible)
                    Logger.Send(LogType.Error, "", String.Format("Unable to update TimeInterval!\n{0}\n\n{1}", e.Message, e.StackTrace));
            }
            
        }

        private void UpdateCanShowHideSideBar()
        {
            ShowSideBar.Visibility = CanShowHideSideBar && !SideBarOpen
                ? Visibility.Visible
                : Visibility.Collapsed;
            HideSideBar.Visibility = CanShowHideSideBar && SideBarOpen
                ? Visibility.Visible
                : Visibility.Collapsed;
        }

        private void UpdateDateVisible()
        {
            DateRow.Height = DateVisible
                ? new GridLength(35, GridUnitType.Pixel)
                : new GridLength(0, GridUnitType.Pixel);
        }
        
        private void UpdateSideBarOpen()
        {
            SideBar.Width = SideBarOpen
                ? new GridLength(200, GridUnitType.Pixel)
                : new GridLength(0, GridUnitType.Pixel);
            DateBorder.BorderThickness = SideBarOpen
                ? new Thickness(0.75, 0.75, 0, 0.75)
                : new Thickness(0.75, 0.75, 0.75, 0.75);
            UpdateCanShowHideSideBar();
        }

        private void UpdateZoom()
        {
            ResizeIntervals(Bookings.ActualHeight);
        }

        private void UpdateSelectedDate()
        {
            CurrentDate.Text = string.Format("{0:ddd, dd MMMM yyyy}", SelectedDate);
            Bookings.SelectedDate = _selecteddate.Date;
            
            var margin = IntervalToTimeSpan(TimeInterval);
            var start = new TimeSpan(StartHour, 0, 0);
            if (start >= margin)
                start -= margin;
            Bookings.DisplayDate = _selecteddate.Add(start);
        }
        
        public void SetDisplayWindow(int start, int end)
        {
            if (!double.IsNaN(ActualHeight))
            {
                ResizeIntervals(ActualHeight);
                SelectedDate = SelectedDate; // to trigger a reset?
            }
        }

        private void LoadEmployees()
        {
            var emps = new Dictionary<Guid, string>();
            foreach (var row in _employees.Rows.Where(r =>
                         r.Get<EmployeeTeam, Guid>(c => c.TeamLink.ID).Equals(SelectedTeam) || SelectedTeam.Equals(CoreUtils.FullGuid)))
                emps[row.Get<EmployeeTeam, Guid>(c => c.EmployeeLink.ID)] = row.Get<EmployeeTeam, string>(c => c.EmployeeLink.Name);
            Employees.ItemsSource = emps;
        }

        private void UpdateSelectedEmployees()
        {
            List<SchedulerResource> resources = new List<SchedulerResource>();
            Employees.SelectedItems.Clear();
            foreach (var item in Employees.Items)
            {
                var emp = (KeyValuePair<Guid, string>)item;
                if (SelectedEmployees.Contains(emp.Key))
                {
                    Employees.SelectedItems.Add(item);
                    resources.Add(
                        new SchedulerResource
                        {
                            Name = emp.Value,
                            Id = emp.Key.ToString()
                        }
                    );

                }
            }
            Bookings.ResourceCollection = new ObservableCollection<object>(resources);
            Bookings.DaysViewSettings.ResourceHeaderSize = resources.Count <= 1 ? 0 : 50;
        }
        
        
        #endregion
        
        public Assignment FindAssignment(Guid id)
        {
            return _assignments.Rows.FirstOrDefault(r => r.Get<Assignment, Guid>(c => c.ID).Equals(id))?.ToObject<Assignment>();
        }

        private IAssignmentViewModel FindModel(Guid id)
        {
            var appointments = Bookings.ItemsSource as ScheduleAppointmentCollection;
            return appointments.FirstOrDefault(x => (x as IAssignmentViewModel).AssignmentID.Equals(id)) as IAssignmentViewModel;

        }
        
        public void AddAssignment(Assignment assignment)
        {
            var row = _assignments.NewRow();
            _assignments.LoadRow(row, assignment);
            _assignments.Rows.Add(row);
            LoadModels(assignment.ID);
        }

        public void GetWindow(TimeSpan time, ref TimeSpan start, ref TimeSpan finish)
        {
            
            foreach (var row in _assignments.Rows)
            {
                var curstart = row.Get<Assignment, TimeSpan>(x => x.Start);
                var curfinish = row.Get<Assignment, TimeSpan>(x => x.Finish);

                if ((curfinish <= time) && (curfinish >= start))
                    start = curfinish;

                if ((curstart >= time) && (curstart <= finish))
                    finish = curstart;
            }

        }
        
        public CoreTable Data() => _assignments;

        public void Setup()
        {
            _employees = new Client<EmployeeTeam>().Query(
                null,
                new Columns<EmployeeTeam>(
                    x => x.TeamLink.ID,
                    x => x.TeamLink.Code,
                    x => x.TeamLink.Name,
                    x => x.EmployeeLink.ID,
                    x => x.EmployeeLink.Name
                ),
                new SortOrder<EmployeeTeam>(x => x.TeamLink.Code).ThenBy(x => x.EmployeeLink.Name)
            );
            
            _employees.IntoDictionary<EmployeeTeam, Guid, String>(
                _teams,
                x => x.TeamLink.ID, 
                r => r.Get<EmployeeTeam,String>(c=>c.TeamLink.Name)
            );
            Teams.ItemsSource = _teams;
            
            bReady = true;
        }
        
        private void ResizeIntervals(double height)
        {
            if (double.IsNaN(height) || height == 0.0F)
                return;
            var zoomedheight = height * (Zoom / 100.0F);
            Bookings.DaysViewSettings.TimeIntervalSize = zoomedheight / 24;
        }

        private void Bookings_SizeChanged(object sender, SizeChangedEventArgs e)
        {
            ResizeIntervals(e.NewSize.Height);
        }
        
        public void Refresh()
        {
            
            var filter = new Filter<Assignment>(x => x.Date).IsGreaterThanOrEqualTo(SelectedDate.Date)
                .And(x => x.Date).IsLessThanOrEqualTo(SelectedDate.Date.AddDays(1))
                .And(x =>x.EmployeeLink.ID).InList(SelectedEmployees);
            
            _assignments = new Client<Assignment>().Query(
                filter,
                new Columns<Assignment>(
                    x => x.ID,
                    x => x.Title,
                    x => x.ActivityLink.ID,
                    x => x.ActivityLink.Color,
                    x => x.ActivityLink.Description,
                    x => x.ActivityLink.Deleted,
                    x => x.JobLink.ID,
                    x => x.JobLink.Name,
                    x => x.JobLink.JobNumber,
                    x => x.JobLink.Deleted,
                    x => x.ITP.ID,
                    x => x.ITP.Code,
                    x => x.ITP.Description,
                    x => x.ITP.Deleted,
                    x => x.Number,
                    x => x.Description,
                    x => x.Date,
                    x => x.Start,
                    x => x.Duration,
                    x => x.Finish,
                    x => x.LeaveRequestLink.ID,
                    x => x.Completed,
                    x => x.Delivery.ID,
                    x => x.Delivery.Notes,
                    x => x.Delivery.Deleted,
                    x => x.TimeSheetLink.ID,
                    x => x.TimeSheetLink.Deleted,
                    x => x.EmployeeLink.ID,
                    x => x.Task.ID,
                    x => x.Task.Number
                )
            );

            CustomiseAssignments?.Invoke(this, _assignments);

            LoadModels(Guid.Empty);
        }

        private void LoadModels(Guid id)
        {
            IAssignmentViewModel selected = null;
            var appointments = new ScheduleAppointmentCollection();
            foreach (var row in _assignments.Rows)
            {
                var assignment = row.ToObject<Assignment>();
                var sColor = assignment.ActivityLink.Color;
                var bgColor = string.IsNullOrWhiteSpace(sColor) ? Colors.White : (Color)ColorConverter.ConvertFromString(sColor);

                var jobdesc = new List<string>();
                var itask = assignment.Task.Number;
                if (itask > 0)
                    jobdesc.Add(string.Format("Task #{0}", itask));
                if (assignment.JobLink.IsValid())
                {
                    var job = assignment.JobLink.JobNumber;
                    if (assignment.ITP.IsValid())
                        job = string.Format("{0} {1}", job, assignment.ITP.Code);
                    job = string.Format("({0})", job);
                    jobdesc.Add(job);
                }

                var date = assignment.Date;


                var sNote = assignment.Description + (assignment.Delivery.IsValid()
                    ? "\n" + assignment.Delivery.Notes
                    : "");
                var model = new AssignmentViewModel
                {
                    Subject = string.Format("{0}", assignment.Title?.Trim()),
                    JobNumber = string.Format(" {0} ", string.Join(" ", jobdesc)),
                    Number = assignment.Number,
                    Notes = sNote.Trim(),
                    StartTime = date.Add(assignment.Start),
                    EndTime = date.Add(assignment.Finish),
                    AssignmentID = assignment.ID,
                    EmployeeID = assignment.EmployeeLink.ID,
                    //AllDay = false,
                    AppointmentForeground = new SolidColorBrush(Colors.Black),
                    AppointmentBackground = new SolidColorBrush(bgColor),
                    Locked = assignment.LeaveRequestLink.IsValid() ? locked : null,
                    Completed = !assignment.LeaveRequestLink.IsValid() && !assignment.Completed.IsEmpty() ? tick : null,
                    HasDelivery = !assignment.LeaveRequestLink.IsValid() && assignment.Delivery.IsValid() ? box : null,
                    TimeSheet = assignment.TimeSheetLink.IsValid() ? timesheet : null,
                    ResourceIdCollection = new ObservableCollection<object>() { assignment.EmployeeLink.ID.ToString() }
                };
                appointments.Add(model);
                if (model.AssignmentID == id)
                    selected = model;
            }
            
            Bookings.ItemsSource = appointments;
            ResizeIntervals(Bookings.ActualHeight);
            UpdateWorkingHourColors();
        }

        public void UpdateAssignment(Assignment assignment)
        {
            var row = _assignments.Rows.FirstOrDefault(r => r.Get<Assignment, Guid>(x => x.ID).Equals(assignment.ID));
            _assignments.LoadRow(row, assignment);

            var model = FindModel(assignment.ID);
            
            var sColor = assignment.ActivityLink.Color;
            var bgColor = string.IsNullOrWhiteSpace(sColor) ? Colors.White : (Color)ColorConverter.ConvertFromString(sColor);

            var date = assignment.Date;
            var leaveid = assignment.LeaveRequestLink.ID;

            var job = "";
            if (assignment.JobLink.IsValid())
            {
                job = assignment.JobLink.JobNumber;
                if (assignment.ITP.IsValid())
                    job = string.Format("{0} {1}", job, assignment.ITP.Code);
                job = string.Format(" ({0}) ", job);
            }

            model.Subject = assignment.Title;
            model.Number = assignment.Number;
            model.JobNumber = job;
            model.Notes = assignment.Description;
            model.StartTime = date.Add(assignment.Start);
            model.EndTime = date.Add(assignment.Finish);
            model.AppointmentBackground = new SolidColorBrush(bgColor);
            model.Locked = assignment.LeaveRequestLink.IsValid() ? locked : null;
            model.Completed = !assignment.LeaveRequestLink.IsValid() && !assignment.Completed.IsEmpty() ? tick : null;
            model.HasDelivery = !assignment.LeaveRequestLink.IsValid() && assignment.Delivery.IsValid() ? box : null;
            model.TimeSheet = assignment.TimeSheetLink.IsValid() ? timesheet : null;
            //Bookings.UpdateLayout();
        }
        
        #region Responding to UI Events
        
        private void PrevMonth_Click(object sender, RoutedEventArgs e)
        {
            SelectedDate = SelectedDate.AddDays(-7);
            AssignmentSelectionChanged?.Invoke(this, null);
            Refresh();
        }

        private void PrevDay_Click(object sender, RoutedEventArgs e)
        {
            SelectedDate = SelectedDate.AddDays(-1);
            AssignmentSelectionChanged?.Invoke(this, null);
            Refresh();
        }

        private void CurrentDate_MouseDoubleClick(object sender, MouseButtonEventArgs e)
        {
            SelectedDate = DateTime.Today;
            AssignmentSelectionChanged?.Invoke(this, null);
            Refresh();
        }

        private void NextDay_Click(object sender, RoutedEventArgs e)
        {
            SelectedDate = SelectedDate.AddDays(1);
            AssignmentSelectionChanged?.Invoke(this, null);
            Refresh();
        }

        private void NextMonth_Click(object sender, RoutedEventArgs e)
        {
            SelectedDate = SelectedDate.AddDays(7);
            AssignmentSelectionChanged?.Invoke(this, null);
            Refresh();
        }

        private void Teams_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (_updatingUI)
                return;
            SelectedTeam = (Guid)Teams.SelectedValue;
            SelectedEmployees = _employees.Rows
                .Where(r => (SelectedTeam == CoreUtils.FullGuid) || (r.Get<EmployeeTeam, Guid>(c => c.TeamLink.ID) == SelectedTeam))
                .Select(r => r.Get<EmployeeTeam, Guid>(c => c.EmployeeLink.ID))
                .Distinct()
                .ToArray();
            Refresh();
        }
 
        private void Employees_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (_updatingUI)
                return;
            SelectedEmployees = Employees.SelectedItems.Select(x => ((KeyValuePair<Guid, String>)x).Key).ToArray();
            Refresh();
        }
        
        private void StartTime_OnValueChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            if (_updatingUI)
                return;
            StartHour = (int)StartTime.Value.Value.TotalHours;
        }
        
        private void EndTime_OnValueChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            if (_updatingUI)
                return;
            EndHour = (int)EndTime.Value.Value.TotalHours;
        }

        
        private void OpenSideBar_Click(object sender, RoutedEventArgs e)
        {
            SideBarOpen = true;
        }

        private void CloseSideBar_Click(object sender, RoutedEventArgs e)
        {
            SideBarOpen = false;
        }
        
        #endregion
        

        private void Schedule_AppointmentEditorOpening(object sender, AppointmentEditorOpeningEventArgs e)
        {
            if (e.Appointment != null)
            {
                var model = (AssignmentViewModel)e.Appointment;
                Assignment ass = null;
                using (new WaitCursor())
                {
                    ass = new Client<Assignment>().Load(new Filter<Assignment>(x => x.ID).IsEqualTo(model.AssignmentID))
                        .FirstOrDefault();
                }

                if (ass != null)
                    EditAssignment(ass);
                else
                    MessageBox.Show("Cannot Load Assignment!");
            }
            else
            {
                var res = e.Resource;
                if (res != null)
                {
                    var ass = new Assignment();
                    ass.EmployeeLink.ID = Guid.Parse(res.Id.ToString());
                    ass.Date = e.DateTime;
                    ass.Duration = new TimeSpan(1, 0, 0);
                    var ag = new DynamicDataGrid<Assignment>();
                    if (ag.EditItems(new[] { ass }))
                        Refresh();
                }
                else
                {
                    MessageBox.Show("No Employee Selected!");
                }
            }

            e.Cancel = true;
        }
        
        // private void Schedule_AppointmentStartDragging(object sender, AppointmentStartDraggingEventArgs e)
        // {
        //     var model = e.Appointment as AssignmentViewModel;
        //     if (model == null || model.Locked != null || model.TimeSheet != null)
        //         e.Cancel = true;
        // }
        //
        // private void Schedule_AppointmentEndDragging(object sender, AppointmentEndDraggingEventArgs e)
        // {
        //     var model = (AssignmentViewModel)e.Appointment;
        //     
        //     var row = model != null ? Assignments.Rows.FirstOrDefault(r => r.Get<Assignment, Guid>(x => x.ID).Equals(model.AssignmentID)) : null;
        //     if (row != null)
        //     {
        //         Assignment ass = null;
        //         using (new WaitCursor())
        //         {
        //             ass = new Client<Assignment>().Load(new Filter<Assignment>(x => x.ID).IsEqualTo(model.AssignmentID)).FirstOrDefault();
        //         }
        //
        //         if (ass != null)
        //         {
        //             var resource = e.Resources.FirstOrDefault() as Resource;
        //             var employeeid = Guid.Parse(resource.ResourceName);
        //             ass.EmployeeLink.ID = employeeid;
        //
        //             var newtime = e.To.TimeOfDay;
        //             if (e.To.Minute >= 45)
        //                 newtime = new TimeSpan(e.To.Hour, 45, 0);
        //             else if (e.To.Minute >= 30)
        //                 newtime = new TimeSpan(e.To.Hour, 30, 0);
        //             else if (e.To.Minute >= 15)
        //                 newtime = new TimeSpan(e.To.Hour, 15, 0);
        //             else
        //                 newtime = new TimeSpan(e.To.Hour, 0, 0);
        //             ass.Date = e.To.Date;
        //             ass.Start = newtime;
        //
        //             using (new WaitCursor())
        //             {
        //                 new Client<Assignment>().Save(ass, "Dragged by User", (obj, args) => { });
        //             }
        //
        //             AssignmentChanged?.Invoke(this, ass);
        //
        //             Refresh();
        //
        //             e.Cancel = true;
        //         }
        //         else
        //         {
        //             MessageBox.Show("Unable to load Assigmment!");
        //         }
        //     }
        //     else
        //     {
        //         MessageBox.Show("Unable to locate Assignment!");
        //     }
        // }
        //
        // private void Schedule_AppointmentEndResizing(object sender, AppointmentEndResizingEventArgs e)
        // {
        //     var model = (AssignmentViewModel)e.Appointment;
        //     var row = model != null ? Assignments.Rows.FirstOrDefault(r => r.Get<Assignment, Guid>(x => x.ID).Equals(model.AssignmentID)) : null;
        //     if (row != null)
        //     {
        //         Assignment ass = null;
        //         using (new WaitCursor())
        //         {
        //             ass = new Client<Assignment>().Load(new Filter<Assignment>(x => x.ID).IsEqualTo(model.AssignmentID)).FirstOrDefault();
        //         }
        //
        //         if (ass != null)
        //         {
        //             var newtime = e.To;
        //             if (e.To.Minute >= 45)
        //                 newtime = new DateTime(e.To.Year, e.To.Month, e.To.Day, e.To.Hour, 45, 0);
        //             else if (e.To.Minute >= 30)
        //                 newtime = new DateTime(e.To.Year, e.To.Month, e.To.Day, e.To.Hour, 30, 0);
        //             else if (e.To.Minute >= 15)
        //                 newtime = new DateTime(e.To.Year, e.To.Month, e.To.Day, e.To.Hour, 15, 0);
        //             else
        //                 newtime = new DateTime(e.To.Year, e.To.Month, e.To.Day, e.To.Hour, 0, 0);
        //             ass.Date = newtime;
        //             using (new WaitCursor())
        //             {
        //                 new Client<Assignment>().Save(ass, "Dragged by User", (obj, args) => { });
        //             }
        //
        //             AssignmentChanged?.Invoke(this, ass);
        //
        //             Refresh();
        //             e.Cancel = true;
        //         }
        //         else
        //         {
        //             MessageBox.Show("Unable to load Assigmment!");
        //         }
        //     }
        //     else
        //     {
        //         MessageBox.Show("Unable to locate Assignment!");
        //     }
        // }
        //

        // private AssignmentViewTimeInterval TimeSpanToInterval(TimeSpan time)
        // {
        //     if (time <= new TimeSpan(0, 5, 0))
        //         return AssignmentViewTimeInterval.FiveMinutes;
        //     if (time <= new TimeSpan(0, 6, 0))
        //         return AssignmentViewTimeInterval.SixMinutes;
        //     if (time <= new TimeSpan(0, 10, 0))
        //         return AssignmentViewTimeInterval.TenMinutes;
        //     if (time <= new TimeSpan(0, 15, 0))
        //         return AssignmentViewTimeInterval.FifteenMinutes;
        //     if (time <= new TimeSpan(0, 20, 0))
        //         return AssignmentViewTimeInterval.TwentyMinutes;
        //     if (time <= new TimeSpan(0, 30, 0))
        //         return AssignmentViewTimeInterval.ThirtyMinutes;
        //     return AssignmentViewTimeInterval.SixyMinutes;
        // }

        private TimeSpan IntervalToTimeSpan(AssignmentViewTimeInterval interval)
        {
            switch (interval)
            {
                case AssignmentViewTimeInterval.FiveMinutes:
                    return new TimeSpan(0, 5, 0);
                case AssignmentViewTimeInterval.SixMinutes:
                    return new TimeSpan(0, 6, 0);
                case AssignmentViewTimeInterval.TenMinutes:
                    return new TimeSpan(0, 10, 0);
                case AssignmentViewTimeInterval.FifteenMinutes:
                    return new TimeSpan(0, 15, 0);
                case AssignmentViewTimeInterval.TwentyMinutes:
                    return new TimeSpan(0, 20, 0);
                case AssignmentViewTimeInterval.ThirtyMinutes:
                    return new TimeSpan(0, 30, 0);
                default:
                    return new TimeSpan(1, 0, 0);
            }
        }
        
        // private int GetDivider(AssignmentViewTimeInterval interval)
        // {
        //     switch (interval)
        //     {
        //         case AssignmentViewTimeInterval.FiveMinutes:
        //             return 12;
        //         case AssignmentViewTimeInterval.SixMinutes:
        //             return 10;
        //         case AssignmentViewTimeInterval.TenMinutes:
        //             return 6;
        //         case AssignmentViewTimeInterval.FifteenMinutes:
        //             return 4;
        //         case AssignmentViewTimeInterval.TwentyMinutes:
        //             return 3;
        //         case AssignmentViewTimeInterval.ThirtyMinutes:
        //             return 2;
        //         default:
        //             return 1;
        //     }            
        // }
        //
        // private TimeSpan GetTime(int row)
        // {
        //     int divider = GetDivider(TimeInterval);
        //     var hours = row / divider;
        //     var mins = row % divider * (60 / divider);
        //     return new TimeSpan(hours, mins, 0);
        // }

        // private TimeSpan GetTime(Point point)
        // {
        //     var view = Bookings.FindVisualChildren<ScrollViewer>().LastOrDefault(x => x.Name.Equals("PART_ScrollViewer"));
        //     var intervalheight = (Bookings.ActualHeight - 30.0F) / (24 * 4);
        //     var row = (int)Math.Truncate((view.VerticalOffset + point.Y - 30.0F) / Bookings.DaysViewSettings.TimeIntervalSize);
        //     var result = GetTime(row);
        //     return result;
        // }

        // private void Bookings_Drop(object sender, DragEventArgs e)
        // {
        //     if (e.Data.GetDataPresent("Comal.Classes.Delivery"))
        //     {
        //         var delivery = (e.Data.GetData("Comal.Classes.Delivery") as CoreRow[]).FirstOrDefault();
        //         if (delivery == null)
        //             return;
        //
        //         var assignment = new Assignment();
        //
        //         var resource = Bookings.ResourceCollection.OfType<SchedulerResource>().ToArray();
        //         var colwidth = Bookings.ActualWidth / resource.Length;
        //         var column = (int)Math.Truncate(e.GetPosition(Bookings).X / colwidth);
        //         var employee = resource[column];
        //
        //         assignment.EmployeeLink.ID = Guid.Parse(employee.Id.ToString());
        //
        //         assignment.Date = SelectedDate.Date;
        //
        //         //double intervalheight = (Bookings.ActualHeight - 30.0F) / (double)((Bookings.WorkEndHour - Bookings.WorkStartHour) * 4);
        //         //int row = (int)Math.Truncate((e.GetPosition(Bookings).Y - 30.0F) / intervalheight);
        //         //int hour = Bookings.WorkStartHour + (row / 4);
        //         //int min = (row % 4) * 15;
        //         //assignment.Start = new TimeSpan(hour, min, 0);
        //         assignment.Start = GetTime(e.GetPosition(Bookings));
        //
        //         assignment.Duration = new TimeSpan(2, 0, 0);
        //
        //         assignment.JobLink.ID = delivery.Get<Delivery, Guid>(x => x.Job.ID);
        //
        //         assignment.Description = string.Format("Delivery Docket #{0}", delivery.Get<Delivery, int>(x => x.Number));
        //
        //         using (new WaitCursor())
        //         {
        //             new Client<Assignment>().Save(assignment, "Created for Delivery");
        //             var del = new Client<Delivery>().Load(new Filter<Delivery>(x => x.ID).IsEqualTo(delivery.Get<Delivery, Guid>(x => x.ID)))
        //                 .FirstOrDefault();
        //             del.Assignment.ID = assignment.ID;
        //             new Client<Delivery>().Save(del, "Booked via Scheduler");
        //         }
        //
        //         AssignmentChanged?.Invoke(this, assignment);
        //
        //         Refresh();
        //
        //         AssignmentSelectionChanged?.Invoke(this, assignment);
        //     }
        //     else if (e.Data.GetDataPresent("Comal.Classes.Kanban"))
        //     {
        //         var kanban = e.Data.GetData("Comal.Classes.Kanban") as Kanban;
        //         if (kanban == null)
        //             return;
        //
        //         var assignment = new Assignment();
        //
        //         var resources = Bookings.ResourceCollection.OfType<SchedulerResource>().ToArray();
        //         var colwidth = Bookings.ActualWidth / resources.Length;
        //         var column = (int)Math.Truncate(e.GetPosition(Bookings).X / colwidth);
        //         var employee = resources[column];
        //
        //         assignment.EmployeeLink.ID = Guid.Parse(employee.Id.ToString());
        //
        //         assignment.Date = SelectedDate.Date;
        //
        //         var view = Bookings.FindVisualChildren<ScrollViewer>().FirstOrDefault(x => x.Name.Equals("Scrollviewer1"));
        //         var intervalheight = (Bookings.ActualHeight - 30.0F) / (24 * 4);
        //         var row = (int)Math.Truncate((view.VerticalOffset + e.GetPosition(Bookings).Y - 30.0F) / Bookings.DaysViewSettings.TimeIntervalSize);
        //         assignment.Start = GetTime(row);
        //
        //         assignment.Duration = new TimeSpan(0, 30, 0);
        //
        //         assignment.JobLink.ID = kanban.JobLink.ID;
        //         assignment.Task.ID = kanban.ID;
        //
        //         assignment.Title = kanban.Title;
        //
        //         AssignmentChanged?.Invoke(this, assignment);
        //
        //         Refresh();
        //
        //         AssignmentSelectionChanged?.Invoke(this, assignment);
        //     }
        // }

        private void Bookings_OnAppointmentTapped(object? sender, AppointmentTappedArgs e)
        {
            var model = e.Appointment as IAssignmentViewModel;
            
            if (model != null)
            {
                var ass = FindAssignment(model.AssignmentID);
                if (
                    ((ass == null) && (_selectedassignment != null)) 
                    || ((ass != null) && (ass.ID != _selectedassignment))
                )
                {
                    _selectedassignment = ass != null ? ass.ID : Guid.Empty;
                    AssignmentSelectionChanged?.Invoke(this, ass);
                }
            }
            else
            {
                if (_selectedassignment != Guid.Empty)
                {
                    _selectedassignment = Guid.Empty;
                    AssignmentSelectionChanged?.Invoke(this, null);
                }
            }
        }
        
        #region Context Menu Handling
        
        private void Bookings_OnSchedulerContextMenuOpening(object? sender, SchedulerContextMenuOpeningEventArgs e)
        {
            IAssignmentData args = null;
            e.ContextMenu.Items.Clear();
            if (e.MenuType == SchedulerContextMenuType.Appointment)
            {
                var model = e.MenuInfo.Appointment as IAssignmentViewModel;
                args = new AssignmentData(model, Guid.Empty, DateTime.MinValue);
                CreateEditMenu(e.ContextMenu, args);
                e.ContextMenu.Items.Add(new Separator());
                CreateDeleteMenu(e.ContextMenu, args);
                e.ContextMenu.Items.Add(new Separator());
            }
            else if (e.MenuType == SchedulerContextMenuType.TimeSlotCell)
            {
                if (Guid.TryParse(e.MenuInfo.Resource.Id?.ToString(), out Guid employeeid))
                {
                    args = new AssignmentData(null, employeeid, e.MenuInfo.DateTime.Value);
                    CreateAddMenu(e.ContextMenu, args);
                    e.ContextMenu.Items.Add(new Separator());
                }
            }
            
            CreateZoomMenus(e.ContextMenu, args);
            
            CustomiseContextMenu?.Invoke(e.ContextMenu, args);
            
        }
        
        private void CreateMenu(ContextMenu menu, string name, string header, IAssignmentData args, RoutedEventHandler action,
            Visibility visibility)
        {
            var item = new MenuItem();
            item.Name = name;
            item.Header = header;
            item.Click += action;
            item.Visibility = visibility;
            item.Tag = args;
            menu.Items.Add(item);
        }
        
        public bool CreateAddMenu(ContextMenu menu, IAssignmentData args)
        {
            if (args.Model == null)
            {
                CreateMenu(menu, "CreateAssignment", "Create Assignment", args, CreateAssignment_Click,
                    Visibility.Visible);
                return true;
            }

            return false;
        }
        
        public bool CreateEditMenu(ContextMenu menu, IAssignmentData args)
        {
            if (args.Model != null)
            {
                CreateMenu(menu, "EditAssignment", "Edit Assignment", args, EditAssignment_Click, 
                    Visibility.Visible);
                return true;
            }
            return false;
        }
        
        public bool CreateDeleteMenu(ContextMenu menu, IAssignmentData args)
        {
            if (args.Model != null)
            {
                CreateMenu(menu, "DeleteAssignment", "Delete Assignment", args, DeleteAssignment_Click, 
                    Visibility.Visible);
                return true;
            }
            return false;
        }

        public bool CreateZoomMenus(ContextMenu menu, IAssignmentData args)
        {
            CreateMenu(menu, "ZoomIn", "Zoom In", args, ZoomIn_Click, Visibility.Visible);
            CreateMenu(menu, "ZoomOut", "Zoom Out", args, ZoomOut_Click, Visibility.Visible);
            CreateMenu(menu, "ZoomReset", "Reset Zoom", args, ZoomReset_Click, Visibility.Visible);
            return true;
        }
        
        
        private void EditAssignment(Assignment ass)
        {
            if (_assignmentgrid == null)
                _assignmentgrid = new AssignmentGrid();
            if (_assignmentgrid.EditItems(new[] { ass }))
            {
                AssignmentChanged?.Invoke(this, ass);
                Refresh();
            }
        }
        
        private void CreateAssignment_Click(object sender, RoutedEventArgs e)
        {
            var data = (sender as MenuItem).Tag as IAssignmentData;
            if (data != null)
            {
                var ass = new Assignment();
                ass.Date = data.Time.Date;
                ass.Start = data.Time.TimeOfDay;
                ass.Duration = new TimeSpan(1, 0, 0);
                ass.EmployeeLink.ID = data.EmployeeID;
                EditAssignment(ass);
            }
            else
            {
                MessageBox.Show("Please select an employee first!");
            }
        }
        
        private void EditAssignment_Click(object sender, RoutedEventArgs e)
        {
            var data = (sender as MenuItem).Tag as IAssignmentData;
            Assignment ass = null;

            using (new WaitCursor())
            {
                ass = new Client<Assignment>().Load(new Filter<Assignment>(x => x.ID).IsEqualTo(data.Model.AssignmentID))
                    .FirstOrDefault();
            }

            if (ass != null)
                EditAssignment(ass);
            else
                MessageBox.Show("Cannot Load Assignment!");
        }
        
        private void DeleteAssignment_Click(object sender, RoutedEventArgs e)
        {
            var data = (sender as MenuItem).Tag as IAssignmentData;
            if ((data == null) || (data.Model == null))
            {
                MessageBox.Show("No Assignment to Delete");
                return;
            }

            if (MessageBox.Show("Are you sure you wish to delete this assignment?", "Confirm Delete", MessageBoxButton.YesNo) == MessageBoxResult.Yes)
            {
                Assignment ass = new Assignment() { ID = data.Model.AssignmentID};
                using (new WaitCursor())
                    new Client<Assignment>().Delete(ass, "Assignment Deleted from Scheduler");
                AssignmentChanged?.Invoke(this, ass);
                Refresh();
            }
        }
        
        private void ZoomIn_Click(object sender, RoutedEventArgs e)
        {
            Zoom *= 1.25F;
        }

        private void ZoomOut_Click(object sender, RoutedEventArgs e)
        {
            Zoom /= 1.25F;
        }

        private void ZoomReset_Click(object sender, RoutedEventArgs e)
        {
            Zoom = 100.0F;
        }

        #endregion

        private void Bookings_PreviewKeyDown(object sender, KeyEventArgs e)
        {
            e.Handled = e.Key == Key.Delete;
        }
    }
}