using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Globalization;
using System.Linq;
using System.Linq.Expressions;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Input;
using System.Windows.Media;
using Comal.Classes;
using InABox.Clients;
using InABox.Configuration;
using InABox.Core;
using InABox.DynamicGrid;
using InABox.WPF;
using net.sf.mpxj.mspdi.schema;
using PRSDesktop.WidgetGroups;
using PRS.Shared;
using Syncfusion.Data.Extensions;
using Syncfusion.UI.Xaml.Grid;
using Syncfusion.UI.Xaml.Grid.Helpers;
using Syncfusion.Windows.Tools.Controls;
using SelectionChangedEventArgs = System.Windows.Controls.SelectionChangedEventArgs;
using System.Windows.Documents;
using InABox.Wpf;

namespace PRSDesktop;

public class EmployeeResourcePlannerValue
{
    public Guid[] IDs { get; set; } = Array.Empty<Guid>();

    public AssignmentModel[] Assignments = Array.Empty<AssignmentModel>();
    
    public Brush Background { get; set; }
    public Brush Foreground { get; set; }
    public String Text { get; set; }

    private String _color = "";
    public String Color
    {
        get { return _color; }
        set
        {
            _color = value;
            var color = String.IsNullOrWhiteSpace(value) ? Colors.Transparent : (Color)ColorConverter.ConvertFromString(value);
            Background = new SolidColorBrush(color) { Opacity = 0.8 };
            Foreground = new SolidColorBrush(ImageUtils.GetForegroundColor(color));
        }
    }
}

public enum EmployeePlannerDisplayMode
{
    EmployeeColumns,
    DateColumns
}

public class EmployeeResourcePlannerSettings : BaseObject, IGlobalConfigurationSettings
{
    [EnumLookupEditor(typeof(EmployeePlannerDisplayMode))]
    [EditorSequence(1)]
    public EmployeePlannerDisplayMode DisplayMode { get; set; }

    public EmployeeResourcePlannerSettings()
    {
        DisplayMode = EmployeePlannerDisplayMode.DateColumns;
    }
}

public partial class EmployeeResourcePlanner : UserControl, IPropertiesPanel<EmployeeResourcePlannerSettings>
{

    private enum Suppress
    {
        This
    }

    private EmployeeResourceModel[] _employees = Array.Empty<EmployeeResourceModel>();
    private StandardLeaveModel[] _standardleaves = Array.Empty<StandardLeaveModel>();
    private LeaveRequestModel[] _leaverequests = Array.Empty<LeaveRequestModel>();
    private JobModel[] _jobs = Array.Empty<JobModel>();
    private ActivityModel[] _activities = Array.Empty<ActivityModel>();

    private DateTime[] _dates = Array.Empty<DateTime>();

    private CoreFilterDefinitions _jobfilters = new CoreFilterDefinitions();
    
    public event LoadSettings<EmployeeResourcePlannerProperties> LoadSettings;
    public event SaveSettings<EmployeeResourcePlannerProperties> SaveSettings;

    EmployeeResourcePlannerSettings IPropertiesPanel<EmployeeResourcePlannerSettings>.Properties
    {
        get => Settings;
        set => Settings = value;
    }

    private EmployeeResourcePlannerSettings Settings { get; set; }

    private void DoLoadSettings()
    {
        Properties = LoadSettings?.Invoke(this) ?? new EmployeeResourcePlannerProperties();
        _jobfilters = new GlobalConfiguration<CoreFilterDefinitions>("Job").Load();

    }
    
    private void DoSaveSettings()
    {
        SaveSettings?.Invoke(this, Properties);
    }
    
    public EmployeeResourcePlannerProperties Properties { get; set; }

    public EmployeeResourcePlanner()
    {
        using (new EventSuppressor(Suppress.This))
            InitializeComponent();
    }

    private Filter<Job>? GetJobFilter()
    {
        var jobfilter = _jobfilters.FirstOrDefault(x => String.Equals(x.Name, Properties.JobFilter));
        return !String.IsNullOrWhiteSpace(jobfilter?.Filter)
            ? Serialization.Deserialize<Filter<Job>>(jobfilter.Filter)
            : LookupFactory.DefineFilter<Job>();           
    }
    
    public void Setup()
    {
        using (new EventSuppressor(Suppress.This))
        {
            DoLoadSettings();

            EmployeeSelector.Setup();
            EmployeeSelector.Settings = Properties.EmployeeSettings;
            EmployeeSelector.Selection = Properties.EmployeeSelection;

            ViewType.ItemsSource = Enum.GetValues<EmployeeResourcePlannerViewType>()
                .Select(x => new KeyValuePair<EmployeeResourcePlannerViewType, string>(x, x.ToString()));
            ViewType.SelectedValuePath = "Key";
            ViewType.DisplayMemberPath = "Value";
            ViewType.SelectedValue = Properties.ViewType;

            LeaveType.SelectedIndex = Properties.IncludeUnApprovedLeave ? 1 : 0;

            FromDate.DateTime = DateTime.Today;
            ToDate.DateTime = DateTime.Today.AddYears(1);
            
            MultiQuery query = new MultiQuery();
            
            query.Add<Job>(
                GetJobFilter(), 
                JobModel.Columns,
                new SortOrder<Job>(x => x.JobNumber)
            );
            
            query.Add<StandardLeave>(
                null,
                StandardLeaveModel.Columns
            );
            
            query.Add<LeaveRequest>(
                new Filter<LeaveRequest>(x => x.Status).IsNotEqualTo(LeaveRequestStatus.Rejected),
                LeaveRequestModel.Columns
            );

            query.Add<Activity>(
                LookupFactory.DefineFilter<Activity>(),
                new Columns<Activity>(x => x.ID).Add(x => x.Code).Add(x => x.Description),
                new SortOrder<Activity>(x => x.Code)
            );

            query.Query();

            _jobs = query.Get<Job>().Rows.Select(r => new JobModel(r)).ToArray();
            _standardleaves = query.Get<StandardLeave>().Rows.Select(r=>new StandardLeaveModel(r)).ToArray();
            _leaverequests = query.Get<LeaveRequest>().Rows.Select(r => new LeaveRequestModel(r)).ToArray();
            _activities = query.Get<Activity>().Rows.Select(r => new ActivityModel(r)).ToArray();
            ActivityType.ItemsSource = _activities;
            ActivityType.SelectedValue = Properties.ActivityType;
            
            JobFilter.ItemsSource = _jobfilters;
            JobFilter.SelectedValue = _jobfilters.FirstOrDefault(x => String.Equals(x.Name, Properties.JobFilter));
        }

    }
    
    public void Shutdown(CancelEventArgs? cancel)
    {
    }

    private TimeSpan GetPeriod()
    {
        return Properties.ViewType switch
        {
            EmployeeResourcePlannerViewType.Week => TimeSpan.FromDays(7),
            EmployeeResourcePlannerViewType.Day or _ => TimeSpan.FromDays(1)
        };
    }

    public void Refresh()
    {
        using (new WaitCursor())
        {
            _employees = EmployeeSelector.GetEmployeeData((row, rosters) => new EmployeeResourceModel(row, rosters));
            var empids = _employees.Select(x => x.ID).ToArray();

            DateTime fromdate = FromDate.DateTime.HasValue ? FromDate.DateTime.Value.Date : DateTime.Today;
            DateTime todate = ToDate.DateTime.HasValue ? ToDate.DateTime.Value.Date : DateTime.Today.AddYears(1);

            MultiQuery query = new MultiQuery();

            var period = GetPeriod();
            if(Properties.ViewType == EmployeeResourcePlannerViewType.Week)
            {
                fromdate = fromdate.AddDays(-(((int)fromdate.DayOfWeek - 1) % 7));
                todate = todate.AddDays(-(((int)todate.DayOfWeek - 1) % 7));
            }
            
            query.Add<Assignment>(
                new Filter<Assignment>(x => x.EmployeeLink.ID).InList(empids)
                    .And(x => x.Date).IsGreaterThanOrEqualTo(fromdate)
                    .And(x => x.Date).IsLessThanOrEqualTo(todate + period),
                AssignmentModel.Columns,
                new SortOrder<Assignment>(x => x.EmployeeLink.ID).ThenBy(x => x.Date).ThenBy(x => x.Booked.Duration, SortDirection.Descending)
            );


            query.Query();

            var assignments = query.Get<Assignment>().Rows.Select(r => new AssignmentModel(r)).ToArray();

            var data = new DataTable();

            var standardHours = Properties.ViewType switch
            {
                EmployeeResourcePlannerViewType.Week => 38.0,
                EmployeeResourcePlannerViewType.Day or _ => 7.5
            };

            if(Settings.DisplayMode == EmployeePlannerDisplayMode.EmployeeColumns)
            {
                data.Columns.Add("Date", typeof(DateTime));

                foreach (var employee in _employees)
                {
                    data.Columns.Add(employee.ID.ToString(), typeof(object));
                }

                for (var curdate = fromdate; curdate <= todate; curdate += period)
                {
                    var leavevalue = GetStandardLeave(curdate, _standardleaves);
                    var values = new List<object> { curdate };
                    foreach (var employee in _employees)
                    {
                        var value = new EmployeeResourcePlannerValue();
                        // Note use of short-circuiting here.
                        var bOK = CheckAssignments(employee, curdate, curdate + period, assignments, value)
                            || CheckStandardLeave(leavevalue, value)
                            || CheckLeaveRequest(employee, curdate, curdate + period, _leaverequests, value)
                            || CheckRoster(employee, curdate, curdate + period, standardHours, value);

                        values.Add(value);
                    }

                    data.Rows.Add(values.ToArray());
                }
            }
            else
            {
                data.Columns.Add("Employee", typeof(object));

                var dates = new List<DateTime>();
                for (var curdate = fromdate; curdate <= todate; curdate += period)
                {
                    data.Columns.Add(dates.Count.ToString(), typeof(object));
                    dates.Add(curdate);
                }
                _dates = dates.ToArray();

                foreach (var employee in _employees)
                {
                    var values = new List<object> { employee };
                    for (var curdate = fromdate; curdate <= todate; curdate += period)
                    {
                        var leavevalue = GetStandardLeave(curdate, _standardleaves);
                        var value = new EmployeeResourcePlannerValue();
                        var bOK = CheckAssignments(employee, curdate, curdate + period, assignments, value)
                            || CheckStandardLeave(leavevalue, value)
                            || CheckLeaveRequest(employee, curdate, curdate + period, _leaverequests, value)
                            || CheckRoster(employee, curdate, curdate + period, standardHours, value);

                        values.Add(value);
                    }

                    data.Rows.Add(values.ToArray());
                }
            }


            dataGrid.ItemsSource = data;
        }
    }
    
    private static bool CheckAssignments(EmployeeResourceModel employee, DateTime from, DateTime to, AssignmentModel[] assignments, EmployeeResourcePlannerValue value)
    {
        var dateAssignments = assignments.Where(x => (x.EmployeeID == employee.ID) && (x.Date >= from.Date && x.Date < to.Date)).ToArray();
        if (dateAssignments.Length == 0)
            return false;

        value.IDs = assignments.Select(x => x.ID).ToArray();
        value.Text = dateAssignments.Length == 1
            ? (dateAssignments[0].ID != Guid.Empty ? (dateAssignments[0].JobNumber ?? "") : "XX")
            : $"{dateAssignments.Select(x => x.JobID).Distinct().Count()} jobs";
        value.Assignments = dateAssignments;

        value.Color = Colors.LightGreen.ToString();

        return true;
    }

    private static bool CheckRoster(EmployeeResourceModel employee, DateTime from, DateTime to, double standardHours, EmployeeResourcePlannerValue value)
    {
        value.Text = "";

        var totalRostered = 0.0;

        for(var date = from; date < to; date = date.AddDays(1))
        {
            var roster = RosterUtils.GetRoster(employee.Roster, employee.RosterStart, date);
            if(roster?.Enabled == true)
            {
                totalRostered += roster.Duration;
            }
        }

        var color1 = Colors.LightGray;
        var color2 = Colors.LightYellow;

        var percent = Math.Min(totalRostered / standardHours, 1.0);

        value.Foreground = new SolidColorBrush(ImageUtils.MixColors(color1, 1 - percent, color2)) { Opacity = 0.8 };

        var brush = new LinearGradientBrush { Opacity = 0.8 };
        brush.StartPoint = new Point(0,0);
        brush.GradientStops.Add(new GradientStop(Colors.LightYellow, 0.0));
        brush.GradientStops.Add(new GradientStop(ImageUtils.MixColors(Colors.LightYellow, percent, Colors.LightGray), percent));
        brush.GradientStops.Add(new GradientStop(Colors.LightGray, 1.0));
        brush.EndPoint = new Point(1,0);

        value.Background = brush;

        return totalRostered.IsEffectivelyEqual(0.0);
    }
    
    private static EmployeeResourcePlannerValue? GetStandardLeave(DateTime curdate, StandardLeaveModel[] standardleaves)
    {
        var standardleave = standardleaves.FirstOrDefault(x => 
            (x.From <= curdate) 
            && (x.To.Add(x.ToTime) > curdate)
        );
        return (standardleave != null)
            ? new EmployeeResourcePlannerValue() { Text = standardleave.Code, Color = standardleave.Color}
            : null;
    }

    private static bool CheckStandardLeave(EmployeeResourcePlannerValue? leavevalue, EmployeeResourcePlannerValue value)
    {
        if (leavevalue == null)
            return false;
        value.Text = leavevalue.Text;
        value.Color = leavevalue.Color;
        return true;
    }
    
    private bool CheckLeaveRequest(EmployeeResourceModel employee, DateTime from, DateTime to, LeaveRequestModel[] leaverequests, EmployeeResourcePlannerValue value)
    {
        var leaverequest = leaverequests.FirstOrDefault(c => 
            (c.EmployeeID == employee.ID) 
            && (c.From < to) 
            && (c.To.Add(c.ToTime) >= from) 
            && (Properties.IncludeUnApprovedLeave || c.Status == LeaveRequestStatus.Approved));

        if (leaverequest == null)
            return false;
        value.Text = leaverequest.Code;
        value.Color = (leaverequest.Status == LeaveRequestStatus.Approved) ? leaverequest.Color : Colors.DimGray.ToString();
        return true;
    }
    
    #region AutoGenerate Columns / Styling
    
    private class EmployeeResourcePlannerBackgroundConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value is not EmployeeResourcePlannerValue val)
                return DependencyProperty.UnsetValue;
            return val.Background;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }

    private class EmployeeResourcePlannerForegroundConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value is not EmployeeResourcePlannerValue val)
                return DependencyProperty.UnsetValue;
            return val.Foreground;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }

    private class EmployeeResourcePlannerFontStyleConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value is not EmployeeResourcePlannerValue val)
                return DependencyProperty.UnsetValue;
            return FontStyles.Normal;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }

    private class EmployeeResourcePlannerFontWeightConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value is not EmployeeResourcePlannerValue val)
                return DependencyProperty.UnsetValue;
            return FontWeights.Normal;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }

    private class EmployeeResourcePlannerContentConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value is not EmployeeResourcePlannerValue val)
                return DependencyProperty.UnsetValue;
            return val.Text;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }
    
    private void DataGrid_AutoGeneratingColumn(object? sender, AutoGeneratingColumnArgs e)
    {
        e.Column.TextAlignment = TextAlignment.Center;
        e.Column.HorizontalHeaderContentAlignment = HorizontalAlignment.Center;
        e.Column.ColumnSizer = GridLengthUnitType.None;

        var value = (e.Column.ValueBinding as Binding)!;
        if (value.Path.Path.Equals("Employee"))
        {
            e.Column.Width = 150;
            e.Column.HeaderStyle = Resources["DateHeaderStyle"] as Style;
            e.Column.AllowFocus = false;
            e.Column.DisplayBinding = new Binding { Path = new PropertyPath(e.Column.MappingName + ".Name") };
        }
        else if (value.Path.Path.Equals("Date"))
        {
            e.Column.Width = 80;
            e.Column.HeaderStyle = Resources["DateHeaderStyle"] as Style;
            e.Column.AllowFocus = false;
        }
        else
        {
            var style = new Style(typeof(GridCell));
            style.Setters.Add(new Setter(BackgroundProperty, new Binding(value.Path.Path) { Converter = new EmployeeResourcePlannerBackgroundConverter() }));
            style.Setters.Add(new Setter(ForegroundProperty, new Binding(value.Path.Path) { Converter = new EmployeeResourcePlannerForegroundConverter() }));
            style.Setters.Add(new Setter(FontStyleProperty, new Binding(value.Path.Path) { Converter = new EmployeeResourcePlannerFontStyleConverter() }));
            style.Setters.Add(new Setter(FontWeightProperty, new Binding(value.Path.Path) { Converter = new EmployeeResourcePlannerFontWeightConverter() }));
            e.Column.CellStyle = style;
            e.Column.Width = 55;
            e.Column.HeaderStyle = Resources["ContentHeaderStyle"] as Style;

            if(Settings.DisplayMode == EmployeePlannerDisplayMode.EmployeeColumns)
            {
                e.Column.HeaderText = (Guid.TryParse(value.Path.Path, out var id)
                    ? _employees.FirstOrDefault(x => x.ID == id)?.Name ?? value.Path.Path
                    : value.Path.Path);
            }
            else
            {
                if(int.TryParse(value.Path.Path, out var idx))
                {
                    e.Column.HeaderText = _dates[idx].ToString("dd/MM/yyyy");
                }
            }

            e.Column.DisplayBinding = new Binding { Path = new PropertyPath(e.Column.MappingName), Converter = new EmployeeResourcePlannerContentConverter() };
            //e.Column.ValueBinding = new Binding() { Path = new PropertyPath(e.Column.MappingName), Converter = new LeaveContentConverter() };
            //e.Column.UseBindingValue = true;
            e.Column.AllowFocus = true;
        }
    }

    #endregion
    
    private bool HasData()
    {
        foreach (var cell in dataGrid.GetSelectedCells())
        {
            if (!cell.IsDataRowCell)
                continue;
            var propertyCollection = dataGrid.View.GetPropertyAccessProvider();
            var cellValue = propertyCollection.GetValue(cell.RowData, cell.Column.MappingName);
            if (cellValue is EmployeeResourcePlannerValue val && val.IDs.Length > 0)
                return true;
        }

        return false;
    }
    
    private bool HasData(GridCellInfo cell)
    {
        if (!cell.IsDataRowCell)
            return false;
        var propertyCollection = dataGrid.View.GetPropertyAccessProvider();
        var cellValue = propertyCollection.GetValue(cell.RowData, cell.Column.MappingName);
        return cellValue is EmployeeResourcePlannerValue val && val.IDs.Length > 0;
    }

    private void DataGrid_ContextMenuOpening(object sender, ContextMenuEventArgs e)
    {
        var vc = dataGrid.GetVisualContainer();
        var p = Mouse.GetPosition(vc);
        var rci = vc.PointToCellRowColumnIndex(p);
        if (rci.RowIndex < 1 || rci.ColumnIndex < 1)
        {
            e.Handled = true;
            return;
        }

        dataGrid.ContextMenu.Items.Clear();
        var bAssign = !HasData(dataGrid.CurrentCellInfo);
        var bClear = HasData();

        if (bAssign)
        {
            foreach (var job in _jobs)
            {
                var assign = new MenuItem
                {
                    Header = job.Name,
                    Tag = job
                };
                assign.Click += AssignJobClick;
                dataGrid.ContextMenu.Items.Add(assign);
            }
        }
        
        
        if (bClear && bAssign)
            dataGrid.ContextMenu.Items.Add(new Separator());
        
        
        if (bClear)
        {
            var clear = new MenuItem { Header = "Clear Assignments" };
            clear.Click += ClearJobClick;
            dataGrid.ContextMenu.Items.Add(clear);
        }
        
    }

    private void dataGrid_CellToolTipOpening(object sender, GridCellToolTipOpeningEventArgs e)
    {
        var record = (e.Record as DataRowView)?[e.Column.MappingName];
        if (record is not EmployeeResourcePlannerValue value) return;

        if(value.IDs.Length > 0)
        {
            e.ToolTip.Template = TemplateGenerator.CreateControlTemplate(
                typeof(ToolTip),
                () =>
                {
                    var border = new Border
                    {
                        BorderBrush = new SolidColorBrush(Colors.Gray),
                        BorderThickness = new Thickness(0.75),
                        CornerRadius = new CornerRadius(5),
                        Background = new SolidColorBrush(Colors.LightYellow),
                        Padding = new Thickness(5),
                    };
                    var panel = new StackPanel();
                    foreach (var assignment in value.Assignments)
                    {
                        var textBlock = new TextBlock();
                        textBlock.Inlines.Add(new Run
                        {
                            Text = assignment.JobNumber,
                            FontWeight = FontWeights.Bold
                        });
                        textBlock.Inlines.Add(new Run
                        {
                            Text = $": {assignment.EffectiveStart():hh':'mm} - {assignment.EffectiveFinish():hh':'mm}"
                        });
                        panel.Children.Add(textBlock);
                    }
                    border.Child = panel;
                    return border;
                });
        }
    }
    
    private void GetSelectionData(out DateTime from, out DateTime to, out Guid[] employees, out Guid[] assignments)
    {
        var emps = new List<Guid>();
        var items = new List<Guid>();
        from = DateTime.MaxValue;
        to = DateTime.MinValue;

        var period = GetPeriod();
        foreach (var cell in dataGrid.GetSelectedCells())
        {
            var row = (cell.RowData as DataRowView)!;
            var binding = (cell.Column.ValueBinding as Binding)!;

            DateTime date;
            if(Settings.DisplayMode == EmployeePlannerDisplayMode.EmployeeColumns)
            {
                if (Guid.TryParse(binding.Path.Path, out var emp))
                    if (!emps.Contains(emp))
                        emps.Add(emp);

                date = (DateTime)row.Row.ItemArray.First()!;
            }
            else
            {
                if(int.TryParse(binding.Path.Path, out var idx))
                {
                    date = _dates[idx];
                }
                else
                {
                    date = DateTime.MinValue;
                }

                var empID = ((EmployeeResourceModel)row.Row.ItemArray.First()!).ID;
                if (!emps.Contains(empID))
                    emps.Add(empID);
            }
            if(date != DateTime.MinValue)
            {
                if (date < from)
                    from = date;
                if (date + period > to)
                    to = date + period;
            }

            foreach(var assignment in (row[binding.Path.Path] as EmployeeResourcePlannerValue)!.Assignments)
            {
                items.Add(assignment.ID);
            }
        }

        employees = emps.ToArray();
        assignments = items.ToArray();
    }


    private void AssignJobClick(object sender, RoutedEventArgs e)
    {
        if ((sender as MenuItem)?.Tag is not JobModel job)
            return;
        GetSelectionData(out var from, out var to, out var ids, out var assignments);
        var updates = new List<Assignment>();
        foreach (var id in ids)
        {
            for (DateTime curdate = from; curdate < to; curdate = curdate.AddDays(1))
            {
                var employee = _employees.FirstOrDefault(x => x.ID == id);
                if (employee != null)
                {
                    bool bAvail = 
                        (GetStandardLeave(curdate, _standardleaves) == null)
                        && !CheckLeaveRequest(employee, curdate, curdate.AddDays(1), _leaverequests, new EmployeeResourcePlannerValue());
                    
                    var roster = bAvail ? RosterUtils.GetRoster(employee.Roster, employee.RosterStart, curdate) : null;
                    if (roster?.Enabled == true && roster.Finish > roster.Start)
                    {
                        var assign = new Assignment();
                        assign.Date = curdate;
                        assign.Booked.Start = roster.Start;
                        assign.Booked.Finish = roster.Finish;
                        assign.JobLink.ID = job.ID;
                        assign.EmployeeLink.ID = id;
                        assign.ActivityLink.ID = Properties.ActivityType;
                        assign.JobScope.ID = job.DefaultScopeID;
                        updates.Add(assign);
                    }

                    if (roster?.SplitShift == true && roster.Finish2 > roster.Start2)
                    {
                        var assign = new Assignment();
                        assign.Date = curdate;
                        assign.Booked.Start = roster.Start2;
                        assign.Booked.Finish = roster.Finish2;
                        assign.JobLink.ID = job.ID;
                        assign.EmployeeLink.ID = id;
                        assign.ActivityLink.ID = Properties.ActivityType;
                        assign.JobScope.ID = job.DefaultScopeID;
                        updates.Add(assign);                           
                    }
                }
            }
        }
        if (updates.Any())
        {
            using (new WaitCursor())
            {
                new Client<Assignment>().Save(updates, "Assigned from Employee Resource Planner");
                Refresh();
            }
        }
    }


    private void ClearJobClick(object sender, RoutedEventArgs e)
    {
        GetSelectionData(out DateTime from, out DateTime to, out Guid[] ids, out Guid[] assignments);
        if (assignments.Any() && MessageBox.Show("Clear Assignments?", "Confirm", MessageBoxButton.YesNo) == MessageBoxResult.Yes)
        {
            var deletes = assignments.Select(x => new Assignment() { ID = x }).ToArray();
            using (new WaitCursor())
            {
                new Client<Assignment>().Delete(deletes, "Deleted from Employee Resource Planner");
                Refresh();
            }
        }
    }
    
    public void Heartbeat(TimeSpan time)
    {

    }

    private void _employees_OnSettingsChanged(object sender, EmployeeSelectorSettingsChangedArgs args)
    {
        Properties.EmployeeSettings = args.Settings;
        DoSaveSettings();
    }

    private void _employees_OnSelectionChanged(object sender, EmployeeSelectorSelectionChangedArgs args)
    {
        Properties.EmployeeSelection = args.Selection;
        DoSaveSettings();
        Refresh();
    }

    private void DateTimeChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        if (EventSuppressor.IsSet(Suppress.This))
            return;
        Refresh();
    }

    private void ViewType_OnSelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        if (EventSuppressor.IsSet(Suppress.This))
            return;
        Properties.ViewType = (EmployeeResourcePlannerViewType)ViewType.SelectedValue;
        DoSaveSettings();
        Refresh();
    }

    private void LeaveType_OnSelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        if (EventSuppressor.IsSet(Suppress.This))
            return;
        Properties.IncludeUnApprovedLeave = LeaveType.SelectedIndex > 0;
        DoSaveSettings();
        Refresh();
    }

    private void ActivityType_OnSelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        if (EventSuppressor.IsSet(Suppress.This))
            return;
        Properties.ActivityType = (Guid)(ActivityType.SelectedValue ?? Guid.Empty);
        DoSaveSettings();
    }

    private void JobFilter_OnSelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        if (EventSuppressor.IsSet(Suppress.This))
            return;
        var sel = JobFilter.SelectedValue as CoreFilterDefinition;
        Properties.JobFilter = sel?.Name ?? "";
        using (new WaitCursor())
        {
            DoSaveSettings();
            _jobs = new Client<Job>().Query(
                GetJobFilter(),
                JobModel.Columns,
                new SortOrder<Job>(x => x.JobNumber)
            ).Rows.Select(r => new JobModel(r)).ToArray();
        }
    }

    private void JobFilterButton_Click(object sender, RoutedEventArgs e)
    {
        var window = new DynamicGridFilterEditor(_jobfilters, typeof(Job));
        if (window.ShowDialog() == true)
        {
            new GlobalConfiguration<CoreFilterDefinitions>("Job").Save(_jobfilters);
            JobFilter.SelectedValue = _jobfilters.FirstOrDefault(x => String.Equals(x.Name, Properties.JobFilter));
        }
    }
}