using System;
using System.Collections.Generic;
using System.Data;
using System.Drawing;
using System.Globalization;
using System.Linq;
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 NPOI.SS.Formula.Functions;
using PRSDesktop.WidgetGroups;
using System.ComponentModel;
using Syncfusion.UI.Xaml.Grid;
using Syncfusion.Windows.Tools.Controls;
using SelectionChangedEventArgs = System.Windows.Controls.SelectionChangedEventArgs;
using PRS.Shared;
using Columns = InABox.Core.Columns;
using InABox.Wpf;
using Syncfusion.Data.Extensions;
using NPOI.OpenXmlFormats.Spreadsheet;

namespace PRSDesktop;

public enum JobPlannerDisplayMode
{
    JobColumns,
    DateColumns
}

public class JobResourcePlannerProperties : IUserConfigurationSettings, IDashboardProperties
{
    public JobSelectorSettings JobSettings { get; set; }
    public JobSelectorData JobSelection { get; set; }
    
    public Guid ActivityType { get; set; }
    
    public int MonthsToView { get; set; }

    public TeamSelectorSettings TeamSettings { get; set; }
    public TeamSelectorData TeamSelection { get; set; }
    public double SplitterPosition { get; set; }
    public double HoursPerDay { get; set; }
    public double EmployeeSplitterPosition { get; set; }
    public bool IncludeUnApprovedLeave { get; set; }
    public JobPlannerDisplayMode DisplayMode { get; set; }
    
    public JobResourcePlannerProperties()
    {
        JobSettings = new JobSelectorSettings();
        JobSelection = new JobSelectorData();
        TeamSettings = new TeamSelectorSettings();
        TeamSelection = new TeamSelectorData();
        MonthsToView = 1;
        SplitterPosition = 0F;
        EmployeeSplitterPosition = 0F;
        HoursPerDay = 8.5;
        ActivityType = Guid.Empty;
        IncludeUnApprovedLeave = false;
        DisplayMode = JobPlannerDisplayMode.DateColumns;
    }
}


public partial class JobResourcePlanner : UserControl
{
    private enum Suppress
    {
        This
    }

    private ActivityModel[] _activities = new ActivityModel[] { };
    private LeaveRequestModel[] _leaverequests = new LeaveRequestModel[] { };
    private StandardLeaveModel[] _standardleaves = new StandardLeaveModel[] { };

    private JobModel[] _jobs = new JobModel[] { };

    private EmployeeResourceModel[] _emps = new EmployeeResourceModel[] { };

    private List<AssignmentModel> _assignments = new List<AssignmentModel>();

    private DateTime[] _dates = Array.Empty<DateTime>();
    private double[] _totals = Array.Empty<double>();
    private double[] _available = Array.Empty<double>();
    
    public JobResourcePlannerProperties Properties { get; set; }
    public event LoadSettings<JobResourcePlannerProperties>? LoadSettings;
    public event SaveSettings<JobResourcePlannerProperties>? SaveSettings;
    
    private void DoLoadSettings()
    {
        Properties = LoadSettings?.Invoke(this) ?? new JobResourcePlannerProperties();
    }      
    
    private void DoSaveSettings()
    {
        SaveSettings?.Invoke(this, Properties);
    }

    public JobResourcePlanner()
    {
        using (new EventSuppressor(Suppress.This))
            InitializeComponent();
    }
    
    public void Setup()
    {
        using (new EventSuppressor(Suppress.This))
        {
            DoLoadSettings();
            
            JobSelector.Setup();
            JobSelector.Settings = Properties.JobSettings;
            JobSelector.Selection = Properties.JobSelection;
            _jobs = JobSelector.GetJobData<JobModel>(r => new JobModel(r));

            TeamSelector.Setup();
            TeamSelector.Settings = Properties.TeamSettings;
            TeamSelector.Selection = Properties.TeamSelection;
            _emps = TeamSelector.GetEmployeeData<EmployeeResourceModel>((row, rosters) => new EmployeeResourceModel(row, rosters));
            
            ViewWindow.ItemsSource = new Dictionary<int, String>()
            {
                { 1, "1 Month" },
                { 3, "3 Months" },
                { 6, "6 Months" },
                { 12, "12 months" }
            };
            ViewWindow.SelectedValue = Properties.MonthsToView;
            
            if (Properties.SplitterPosition != 0F)
                TeamSelectorRow.Height = new GridLength(Properties.SplitterPosition, GridUnitType.Pixel);

            if (Properties.EmployeeSplitterPosition != 0F)
                AvailableEmployeesRow.Height = new GridLength(Properties.SplitterPosition, GridUnitType.Pixel);

            HoursSelector.Text = $"{Properties.HoursPerDay:F2}";
            
            LeaveType.SelectedIndex = Properties.IncludeUnApprovedLeave ? 1 : 0;
            Orientation.SelectedIndex = Properties.DisplayMode == JobPlannerDisplayMode.JobColumns ? 1 : 0;
            AvailableEmployees.Refresh(true, false);
            AssignedEmployees.Refresh(true, false);
            
            MultiQuery query = new MultiQuery();
            
            query.Add<StandardLeave>(
                LookupFactory.DefineFilter<StandardLeave>(),
                StandardLeaveModel.Columns
            );
            
            query.Add<LeaveRequest>(
                new Filter<LeaveRequest>(x => x.Status).IsNotEqualTo(LeaveRequestStatus.Rejected),
                LeaveRequestModel.Columns
            );

            query.Add<Activity>(
                LookupFactory.DefineFilter<Activity>(),
                Columns.None<Activity>().Add(x => x.ID).Add(x => x.Code).Add(x => x.Description),
                new SortOrder<Activity>(x => x.Code)
            );

            query.Query();

            _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;
            
        }
    }

    public void Shutdown(CancelEventArgs? cancel)
    {
    }
    
    private bool GetStandardLeaveTimes(DateTime date, out TimeSpan start, out TimeSpan finish)
    {
        bool result = false;
        start = TimeSpan.Zero;
        finish = TimeSpan.FromDays(1);
        var requests = _standardleaves.Where(x => 
            (x.From <= date) 
            && (x.To.Add(x.ToTime) > date)
        );
        if (requests.Any())
        {
            result = true;
            start = TimeSpan.FromDays(1);
            finish = TimeSpan.Zero;
            foreach (var leave in requests)
            {
                var curstart = leave.From == date ? leave.FromTime : TimeSpan.Zero;
                start = start > curstart ? curstart : start;
                var curfinish = leave.To == date ? leave.ToTime : TimeSpan.FromDays(1);
                finish = finish < curfinish ? curfinish : finish;

            }
        }

        return result;            
    }
    
    private void AdjustStandardLeave(DateTime date, ref TimeSpan time)
    {
        TimeSpan result = TimeSpan.Zero;
        var leaves = _standardleaves.Where(x => 
            (x.From <= date)
            && (x.To.Add(x.ToTime) > date)
        );
        foreach (var leave in leaves)
        {
            result += (leave.To == date ? leave.ToTime : TimeSpan.FromDays(1)) -
                         (leave.From == date ? leave.FromTime : TimeSpan.Zero);
        }
        time = time >= result ? time - result : TimeSpan.Zero;
    }

    private bool GetLeaveRequestTimes(DateTime date, EmployeeResourceModel emp, out TimeSpan start, out TimeSpan finish)
    {
        bool result = false;
        start = TimeSpan.Zero;
        finish = TimeSpan.FromDays(1);
        var requests = _leaverequests.Where(x => 
            (x.From <= date) 
            && (x.To.Add(x.ToTime) > date)
            && (x.EmployeeID == emp.ID)
            && (Properties.IncludeUnApprovedLeave ? true : x.Status == LeaveRequestStatus.Approved)
        );
        if (requests.Any())
        {
            result = true;
            start = TimeSpan.FromDays(1);
            finish = TimeSpan.Zero;
            foreach (var leave in requests)
            {
                var curstart = leave.From == date ? leave.FromTime : TimeSpan.Zero;
                start = start > curstart ? curstart : start;
                var curfinish = leave.To == date ? leave.ToTime : TimeSpan.FromDays(1);
                finish = finish < curfinish ? curfinish : finish;

            }
        }

        return result;            
    }
    
    private void AdjustLeaveRequests(DateTime date, EmployeeResourceModel emp, ref TimeSpan time)
    {
        TimeSpan result = TimeSpan.Zero;
        var requests = _leaverequests.Where(x => 
            (x.From <= date) 
            && (x.To.Add(x.ToTime) > date)
            && (x.EmployeeID == emp.ID)
            && (Properties.IncludeUnApprovedLeave ? true : x.Status == LeaveRequestStatus.Approved)
        );
        foreach (var leave in requests)
        {
            result += (leave.To == date ? leave.ToTime : TimeSpan.FromDays(1)) -
                         (leave.From == date ? leave.FromTime : TimeSpan.Zero);
        }

        time = time >= result ? time - result : TimeSpan.Zero;
    }

    public void Refresh()
    {
        using (new WaitCursor())
        {
            
            var jobids = _jobs.Select(x => x.ID).ToArray();
            var empids = _emps.Select(x => x.ID).ToArray();
            var actids = _activities.Select(x => x.ID).ToArray();

            DateTime fromDate = DateTime.Today;
            DateTime toDate = DateTime.Today.AddMonths(Properties.MonthsToView);
            
            MultiQuery query = new MultiQuery();

            query.Add<Assignment>(
                new Filter<Assignment>(x=>x.EmployeeLink.ID).InList(empids)
                    .And(x=>x.Date).IsGreaterThanOrEqualTo(fromDate)
                    .And(x=>x.Date).IsLessThanOrEqualTo(toDate),
                AssignmentModel.Columns
            );
            query.Query();
            _assignments = query.Get<Assignment>().Rows.Select(r => new AssignmentModel(r)).ToList();

            var data = new DataTable();

            var dates = new List<DateTime>();
            for (var curdate = fromDate; curdate <= toDate; curdate = curdate.AddDays(1))
            {
                dates.Add(curdate);
            }
            _dates = dates.ToArray();

            var dataValues = new object?[dates.Count, _jobs.Length];
            var available = new double[dates.Count];
            var totals = new double[dates.Count];

            foreach (var (dateIdx, date) in dates.WithIndex())
            {
                double avail = 0.0F;

                foreach (var emp in _emps)
                {
                    var roster = RosterUtils.GetRoster(emp.Roster, emp.RosterStart, date);

                    var hours = roster.GetBlocks(date, TimeSpan.MinValue, TimeSpan.MaxValue)
                        .Aggregate<RosterBlock, TimeSpan>(TimeSpan.Zero, (value, block) => value + block.Duration);
                    
                    AdjustStandardLeave(date, ref hours);
                    
                    AdjustLeaveRequests(date, emp, ref hours);
                    
                    avail += hours.TotalHours;

                }
                
                var total = avail;
                
                var values = new List<object?> { date };
                
                var anyjobstoday = _assignments.Where(x => (x.Date.Date == date.Date)); 
                avail -= anyjobstoday.Aggregate<AssignmentModel, double>(0F, (value, model) => value + model.BookedDuration.TotalHours);

                foreach (var (jobIdx, job) in _jobs.WithIndex())
                {
                    var thisjobtoday = _assignments.Where(x => (x.Date.Date == date.Date) && (x.JobID == job.ID));
                    if (thisjobtoday.Any())
                    {
                        var assigned = thisjobtoday.Aggregate<AssignmentModel, double>(0F,
                            (value, model) => value + model.BookedDuration.TotalHours);
                        dataValues[dateIdx, jobIdx] = assigned / Properties.HoursPerDay;
                    }
                    else
                        dataValues[dateIdx, jobIdx] = null;
                }

                available[dateIdx] = avail / Properties.HoursPerDay;
                totals[dateIdx] = total / Properties.HoursPerDay;
            }
            _totals = totals;
            _available = available;

            if(Properties.DisplayMode == JobPlannerDisplayMode.JobColumns)
            {
                dataGrid.HeaderRowHeight = 200;
                data.Columns.Add("Date", typeof(DateTime));
                
                data.Columns.Add("Available", typeof(object));
                
                foreach (var job in _jobs)
                    data.Columns.Add(job.ID.ToString(), typeof(object));
                
                foreach(var (dateIdx, date) in dates.WithIndex())
                {
                    var values = new List<object?>(_jobs.Length + 3) { date };
                    
                    foreach (var (jobIdx, job) in _jobs.WithIndex())
                    {
                        values.Add(dataValues[dateIdx, jobIdx]);
                    }

                    values.Insert(1, available[dateIdx]);

                    data.Rows.Add(values.ToArray());
                }
            }
            else if(Properties.DisplayMode == JobPlannerDisplayMode.DateColumns)
            {
                dataGrid.HeaderRowHeight = 30;
                data.Columns.Add("Job", typeof(object));

                var availableRow = new List<object?> { "Available" };
                foreach(var (dateIdx, date) in dates.WithIndex())
                {
                    data.Columns.Add(dateIdx.ToString(), typeof(object));
                    availableRow.Add(available[dateIdx]);
                }
                data.Rows.Add(availableRow.ToArray());

                foreach (var (jobIdx, job) in _jobs.WithIndex())
                {
                    var values = new List<object?>(dates.Count + 1) { job };

                    foreach(var (dateIdx, date) in dates.WithIndex())
                    {
                        values.Add(dataValues[dateIdx, jobIdx]);
                    }

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

            dataGrid.ItemsSource = data;
        }
    }

    private interface ICellWrapper
    {
        DataRowView Row { get; }
        
        string ColumnName { get; }
    }

    public class GridCellInfoWrapper : ICellWrapper
    {
        private GridCellInfo Cell;

        public DataRowView Row => (Cell.RowData as DataRowView)!;

        public string ColumnName => (Cell.Column.ValueBinding as Binding)!.Path.Path; 

        public GridCellInfoWrapper(GridCellInfo cell)
        {
            Cell = cell;
        }
    }

    public class GridCellWrapper : ICellWrapper
    {
        private GridCell Cell;

        public DataRowView Row => (Cell.DataContext as DataRowView)!;

        public string ColumnName => (Cell.ColumnBase?.GridColumn.ValueBinding as Binding)?.Path.Path ?? ""; 

        public GridCellWrapper(GridCell cell)
        {
            Cell = cell;
        }
    }

    private int? GetDateIndex(ICellWrapper cell)
    {
        if(Properties.DisplayMode == JobPlannerDisplayMode.JobColumns)
        {
            if (cell?.Row?.Row?.ItemArray?.First() is DateTime dt)
                return _dates.IndexOf(dt);
            return null;
        }
        else
        {
            if(int.TryParse(cell.ColumnName, out var idx))
            {
                return idx;
            }
            else
            {
                return null;
            }
        }
    }

    private double? GetTotal(ICellWrapper cell)
    {
        var dateIndex = GetDateIndex(cell);
        return dateIndex.HasValue ? _totals[dateIndex.Value] : null;
    }
    private double? GetAvailable(ICellWrapper cell)
    {
        if(Properties.DisplayMode == JobPlannerDisplayMode.JobColumns)
        {
            if (cell?.Row?.Row?.Table?.Columns?.Contains("Available") == true && cell.Row["Available"] is double d)
                return d;
            return null;
        }
        else
        {
            var dateIndex = GetDateIndex(cell);
            return dateIndex.HasValue ? _available[dateIndex.Value] : null;
        }
    }
    
    private abstract class LeaveConverter : IMultiValueConverter
    {
        protected JobResourcePlanner Planner { get; set; }
        public LeaveConverter(JobResourcePlanner planner)
        {
            Planner = planner;
        }

        protected System.Windows.Media.Color GetColor(object[] value)
        {
            if ((value[0] != DBNull.Value) && (value[0] != DependencyProperty.UnsetValue) && (value[0] is not double d || d != 0.0))
                return Colors.DarkSeaGreen;
            if (value[1] is GridCell cell)
            {
                var cellWrp = new GridCellWrapper(cell);
                var total = Planner.GetTotal(cellWrp);
                var available = Planner.GetAvailable(cellWrp);

                if (!total.HasValue || total == 0.0)
                    return Colors.LightGray;

                if (!available.HasValue || available == 0.0F)
                    return Colors.LightSalmon;
                return Colors.LightYellow;
            }

            return Colors.WhiteSmoke;
        }

        public abstract object Convert(object[] value, Type targetType, object parameter, CultureInfo culture);

        public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }
    
    private class LeaveBackgroundConverter : LeaveConverter
    {
        public LeaveBackgroundConverter(JobResourcePlanner planner): base(planner) { }

        public override object Convert(object[] value, Type targetType, object parameter, CultureInfo culture)
        {
            return new SolidColorBrush(base.GetColor(value)) { Opacity = 0.8 };
        }
    }

    private class LeaveForegroundConverter : LeaveConverter
    {
        public LeaveForegroundConverter(JobResourcePlanner planner): base(planner) { }

        public override object Convert(object[] value, Type targetType, object parameter, CultureInfo culture)
        {
            return new SolidColorBrush(ImageUtils.GetForegroundColor(base.GetColor(value)));
        }
    }
    
   private void DataGrid_AutoGeneratingColumn(object sender, AutoGeneratingColumnArgs e)
    {
        MultiBinding CreateBinding<TConverter>(String path, TConverter converter) where TConverter : IMultiValueConverter
        {
            var binding = new MultiBinding();
            binding.Bindings.Add(new Binding(path));
            binding.Bindings.Add(new Binding() { RelativeSource = new RelativeSource(RelativeSourceMode.Self) });
            binding.Converter = converter;
            return binding;
        }


        var value = (e.Column.ValueBinding as Binding)!;
        if (value.Path.Path.Equals("Date"))
        {
            e.Column.Width = 80;
            e.Column.HeaderStyle = Resources["DateHeaderStyle"] as Style;
            e.Column.AllowFocus = false;
        }
        else if (value.Path.Path.Equals("Job"))
        {
            e.Column.Width = 250;
            e.Column.HeaderStyle = Resources["DateHeaderStyle"] as Style;
            e.Column.AllowFocus = false;
            e.Column.TextAlignment = TextAlignment.Left;
            e.Column.DisplayBinding = new Binding
            {
                Path = new PropertyPath(e.Column.MappingName),
                Converter = new FuncConverter<object?, object?>(x => x is JobModel job ? job.Name : x)
            };
            e.Column.HeaderText = "Project Name";
        }
        else if (value.Path.Path.Equals("Available"))
        {
            e.Column = new GridNumericColumn() { NumberDecimalDigits = 2, MappingName = e.Column.MappingName};
            e.Column.Width = 50;
            e.Column.HeaderStyle = e.Column.HeaderStyle = Resources["RotatedHeaderStyle"] as Style;
            e.Column.AllowFocus = false;
            e.Column.HeaderText = "Available";
        }
        else
        {

            e.Column = new GridNumericColumn() { NumberDecimalDigits = 2, MappingName = e.Column.MappingName};
            
            
            if(Properties.DisplayMode == JobPlannerDisplayMode.JobColumns)
            {
                e.Column.Width = 40;
                e.Column.HeaderStyle = Resources["RotatedHeaderStyle"] as Style;
                e.Column.HeaderText = (Guid.TryParse(value.Path.Path, out var id)
                    ? _jobs.FirstOrDefault(x => x.ID == id)?.Name ?? value.Path.Path
                    : value.Path.Path);
            }
            else
            {
                e.Column.Width = 50;
                e.Column.HeaderStyle = Resources["ContentHeaderStyle"] as Style;
                if(int.TryParse(value.Path.Path, out var idx))
                {
                    e.Column.HeaderText = _dates[idx].ToString("dd/MM");
                }
            }

            e.Column.DisplayBinding = new Binding { Path = new PropertyPath(e.Column.MappingName) };
            e.Column.AllowFocus = true;
            var style = new Style(typeof(GridCell));
            style.Setters.Add(new Setter(BackgroundProperty, CreateBinding<LeaveBackgroundConverter>(value.Path.Path, new(this))));
            style.Setters.Add(new Setter(ForegroundProperty, CreateBinding<LeaveForegroundConverter>(value.Path.Path, new(this))));
            e.Column.CellStyle = style;
            e.Column.TextAlignment = TextAlignment.Center;
            e.Column.HorizontalHeaderContentAlignment = HorizontalAlignment.Center;        
        }

        e.Column.ColumnSizer = GridLengthUnitType.None;
        e.Column.ShowHeaderToolTip = false;
        e.Column.ShowToolTip = false;
    }
   
    private void DataGrid_ContextMenuOpening(object sender, ContextMenuEventArgs e)
    {
        var emps = TeamSelector.GetEmployeeData<EmployeeResourceModel>((row, rosters) => new EmployeeResourceModel(row, rosters));
    }
    
    private void DataGrid_OnSelectionChanging(object? sender, GridSelectionChangingEventArgs e)
    {
        var selected = dataGrid.SelectionController.SelectedCells;
        var added = e.AddedItems.OfType<GridCellInfo>();
        if (selected.Any() && added.Any())
        {
            if (Properties.DisplayMode == JobPlannerDisplayMode.JobColumns)
                e.Cancel = added.Any(a => selected.All(s => s.Column != a.Column));
            else
                e.Cancel = selected.Union(added).GroupBy(x => x.Column).Any(g => g.Count() > 1);
        }
    }
    
    private bool bResettingSelection = false;
    
    private void DataGrid_OnPreviewMouseDown(object sender, MouseButtonEventArgs e)
    {
        bResettingSelection = true;
        dataGrid.SelectionController.ClearSelections(false);
    }
    
    private void DataGrid_OnCurrentCellActivating(object? sender, CurrentCellActivatingEventArgs e)
    {
        if (bResettingSelection)
        {
            bResettingSelection = false;
            return;
        }

        // if (Properties.DisplayMode == JobPlannerDisplayMode.JobColumns)
        // {
        //     var thiscol = dataGrid.Columns[e.CurrentRowColumnIndex.ColumnIndex];
        //     var selected = dataGrid.SelectionController.SelectedCells;
        //     if (selected.Any(x => x.Column != thiscol))
        //         e.Cancel = true;
        //     else 
        //         e.Cancel = false;
        //     
        // }
        // else
        // {
        //     var current = e.CurrentRowColumnIndex.RowIndex;
        //     var original = dataGrid.SelectionController.SelectedCells;
        //     // This is Dumb, but it seems the only way to find if multiple rows have been selected
        //     // ie if there are two cells with the same column, we must have multiple rows
        //     // Stupid SelectedCell -> RowIndex is alwasy showing up as -1!
        //     if (original.GroupBy(x => x.Column).Any(g=>g.Count() > 1))
        //          e.Cancel = true;
        //     else
        //         e.Cancel = false;
        // }
    }
    
    private void DataGrid_OnPreviewMouseUp(object sender, MouseButtonEventArgs e)
    {

    }

    private void GetCellData(ICellWrapper cell, out (Guid jobID, DateTime date) result)
    {
        result = (Guid.Empty, DateTime.MinValue);

        if(Properties.DisplayMode == JobPlannerDisplayMode.JobColumns)
        {
            if (Guid.TryParse(cell.ColumnName, out var emp))
            {
                result.jobID = emp;
            }

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

            var jobModel = cell.Row.Row.ItemArray.First() as JobModel;
            result.jobID = jobModel?.ID ?? Guid.Empty;
        }
    }
    private ICellWrapper Wrap(GridCellInfo cell)
    {
        return new GridCellInfoWrapper(cell);
    }
    private ICellWrapper Wrap(GridCell cell)
    {
        return new GridCellWrapper(cell);
    }

    private bool ExtractSelection(out Guid[] jobs, out DateTime[] dates)
    {
        var from = DateTime.MaxValue;
        var to = DateTime.MinValue;

        var jobList = new List<Guid>();

        foreach (var cell in dataGrid.GetSelectedCells())
        {
            GetCellData(Wrap(cell), out var result);
            if (result.jobID == Guid.Empty) continue;

            if (!jobList.Contains(result.jobID))
                jobList.Add(result.jobID);

            if(result.date != DateTime.MinValue)
            {
                if (result.date < from)
                    from = result.date;
                if (result.date > to)
                    to = result.date;
            }
        }
        if(jobList.Count > 0 && to != DateTime.MinValue && from != DateTime.MaxValue)
        {
            jobs = jobList.ToArray();
            var datesList = new List<DateTime>();
            for(DateTime date = from; date <= to; date = date.AddDays(1))
            {
                datesList.Add(date);
            }
            dates = datesList.ToArray();
            return true;
        }
        else
        {
            jobs = [];
            dates = [];
            return false;
        }
    }
    
    private void DataGrid_OnMouseUp(object sender, MouseButtonEventArgs e)
    {
        if (ExtractSelection(out var jobIDs, out var dates))
        {
            if(jobIDs.Length == 1)
            {
                LoadAssignedEmployees(jobIDs, dates);
                LoadAvailableEmployees(dates);
            }
            else
            {
                AvailableEmployees.Items = [];
                AssignedEmployees.Items = [];
                AvailableEmployees.Refresh(false, true);
                AssignedEmployees.Refresh(false, true);
            }
        }
    }
    
    private JobPlannerEmployee GetEmployee(Guid id, List<JobPlannerEmployee> list)
    {
        var result = list.FirstOrDefault(x => x.ID == id);
        if (result == null)
        {
            result = new JobPlannerEmployee()
            {
                ID = id,
                Name = _emps.FirstOrDefault(x=>x.ID == id)?.Name ?? id.ToString(),
                Time = TimeSpan.Zero
            };
            list.Add(result);
        }

        return result;
    }

    private void LoadAvailableEmployees(DateTime[] dates)
    {
        List<JobPlannerEmployee> availableemployees = new List<JobPlannerEmployee>();
        foreach (var emp in _emps)
        {
            foreach (var date in dates)
            {
                var roster = RosterUtils.GetRoster(emp.Roster, emp.RosterStart, date);
                var blocks = roster?.GetBlocks(date, TimeSpan.MinValue, TimeSpan.MaxValue) ?? new RosterBlock[] { };
                var rostered = blocks.Aggregate(TimeSpan.Zero, (time, block) => time += block.Duration);

                AdjustStandardLeave(date, ref rostered);
                AdjustLeaveRequests(date, emp, ref rostered);

                var assignments = _assignments.Where(x => (x.Date == date) && (x.EmployeeID == emp.ID));
                var assigned = assignments.Aggregate(TimeSpan.Zero, (time, assign) => time += assign.BookedDuration);

                if (rostered > assigned)
                    GetEmployee(emp.ID, availableemployees).Time += rostered.Subtract(assigned);
                AvailableEmployees.Items = availableemployees.OrderBy(x=>x.Name).ToList();
                AvailableEmployees.Refresh(false, true);
            }
        }
    }
    
    private void LoadAssignedEmployees(Guid[] jobIDs, DateTime[] dates)
    {
        List<JobPlannerEmployee> assignedemployees = new List<JobPlannerEmployee>();
        foreach (var assignment in _assignments.Where(x => dates.Contains(x.Date) && jobIDs.Contains(x.JobID)))
            GetEmployee(assignment.EmployeeID, assignedemployees).Time += assignment.BookedDuration;
        AssignedEmployees.Items = assignedemployees.OrderBy(x=>x.Name).ToList();
        AssignedEmployees.Refresh(false, true);
    }

    private void JobSelector_OnSettingsChanged(object sender, JobSelectorSettingsChangedArgs args)
    {
        if (EventSuppressor.IsSet(Suppress.This))
            return;
        Properties.JobSettings = args.Settings;
        DoSaveSettings();
    }

    private void JobSelector_OnSelectionChanged(object sender, JobSelectorSelectionChangedArgs args)
    {
        if (EventSuppressor.IsSet(Suppress.This))
            return;
        Properties.JobSelection = args.Selection;
        _jobs = JobSelector.GetJobData<JobModel>(x => new JobModel(x));
        DoSaveSettings();
        Refresh();
    }

    private void TeamSelector_OnSettingsChanged(object sender, TeamSelectorSettingsChangedArgs args)
    {
        if (EventSuppressor.IsSet(Suppress.This))
            return;
        Properties.TeamSettings = args.Settings;
        DoSaveSettings();
    }

    private void TeamSelector_OnSelectionChanged(object sender, TeamSelectorSelectionChangedArgs args)
    {
        if (EventSuppressor.IsSet(Suppress.This))
            return;
        Properties.TeamSelection = args.Selection;
        _emps = TeamSelector.GetEmployeeData<EmployeeResourceModel>((row, rosters) => new EmployeeResourceModel(row, rosters));
        DoSaveSettings();
        Refresh();
    }

    private void JobSelector_OnSizeChanged(object sender, SizeChangedEventArgs e)
    {
        if (EventSuppressor.IsSet(Suppress.This))
            return;
        Properties.SplitterPosition = TeamSelectorRow.Height.Value;
        DoSaveSettings();
    }

    private void ViewWindow_OnSelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        if (EventSuppressor.IsSet(Suppress.This))
            return; 
        Properties.MonthsToView = (int)ViewWindow.SelectedValue;
        DoSaveSettings();
        Refresh();
    }

    private void HoursSelector_Down_Click(object sender, RoutedEventArgs e)
    {
        Properties.HoursPerDay = Math.Max(0.25F, Properties.HoursPerDay - 0.25);
        HoursSelector.Text = $"{Properties.HoursPerDay:F2}";
        DoSaveSettings();
        Refresh();
    }

    private void HoursSelector_Up_Click(object sender, RoutedEventArgs e)
    {
        Properties.HoursPerDay = Math.Min(24F, Properties.HoursPerDay + 0.25);
        HoursSelector.Text = $"{Properties.HoursPerDay:F2}";
        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 AvailableEmployees_OnSizeChanged(object sender, SizeChangedEventArgs e)
    {
        if (EventSuppressor.IsSet(Suppress.This))
            return;
        Properties.EmployeeSplitterPosition = AvailableEmployeesRow.Height.Value;
        DoSaveSettings();
    }

    private void AvailableEmployees_OnOnAction(object sender, JobPlannerEmployee[] availables)
    {

        List<TimeSpan> edges = new List<TimeSpan>();
        void CheckEdges(params TimeSpan[] times)
        {
            foreach (var time in times)
            {
                if (!edges.Contains(time))
                    edges.Add(time);
            }
        }

        bool IsRostered(RosterBlock[] blocks, TimeSpan start, TimeSpan finish)
        {
            foreach (var block in blocks)
            {
                if ((block.Start <= start) && (block.Finish >= finish))
                    return true;
            }
            return false;
        }

        bool IsStandardLeave(DateTime date, TimeSpan start, TimeSpan finish)
        {
            return _standardleaves.Any(x =>
                (x.From.Add(x.FromTime) <= date.Add(start))
                && (x.To.Add(x.ToTime) >= date.Add(finish))
            );
        }
        
        bool IsLeaveRequest(DateTime date, EmployeeResourceModel emp, TimeSpan start, TimeSpan finish)
        {
            return _leaverequests.Any(x =>
                (x.EmployeeID == emp.ID)
                && (x.From.Add(x.FromTime) <= date.Add(start))
                && (x.To.Add(x.ToTime) >= date.Add(finish))
            );
        }

        bool IsAssigned(AssignmentModel[] assignments, TimeSpan start, TimeSpan finish)
        {
            foreach (var assignment in assignments)
            {
                if ((assignment.BookedStart <= start) && (assignment.BookedFinish >= finish))
                    return true;
            }
            return false;                
        }
        
        if (ExtractSelection(out var jobIDs, out var dates))
        {

            if (dataGrid.ItemsSource is DataTable table)
            {

                List<Assignment> updates = new List<Assignment>();
                foreach (var available in availables)
                {
                    foreach (var date in dates)
                    {
                        var dateIdx = _dates.IndexOf(date);

                        var emp = _emps.FirstOrDefault(x => x.ID == available.ID);
                        if (emp != null)
                        {
                            var roster = RosterUtils.GetRoster(emp.Roster, emp.RosterStart, date);
                            var blocks = roster?.GetBlocks(date, TimeSpan.MinValue, TimeSpan.MaxValue) ?? new RosterBlock[] { };
                            foreach (var block in blocks)
                                CheckEdges(block.Start, block.Finish);

                            if (GetStandardLeaveTimes(date, out TimeSpan stdleavestart, out TimeSpan stdleavefinish))
                                CheckEdges(stdleavestart, stdleavefinish);

                            if (GetLeaveRequestTimes(date, emp, out TimeSpan leaverequeststart, out TimeSpan leaverequestfinish))
                                CheckEdges(leaverequeststart, leaverequestfinish);
                            
                            var assignments = _assignments.Where(x => (x.Date == date) && (x.EmployeeID == emp.ID)).ToArray();
                            foreach (var assignment in assignments)
                                CheckEdges(assignment.BookedStart, assignment.BookedFinish);
                            edges.Sort();

                            var adjustment = new double[jobIDs.Length];
                            for (int i = 0; i < edges.Count - 1; i++)
                            {
                                var start = edges[i];
                                var finish = edges[i + 1];

                                if (IsRostered(blocks, start, finish) 
                                    && (!IsStandardLeave(date,start,finish))
                                    && (!IsLeaveRequest(date,emp,start,finish))
                                    && !IsAssigned(assignments, start, finish))
                                {
                                    foreach(var (idx, jobid) in jobIDs.WithIndex())
                                    {
                                        Assignment assignment = new Assignment();
                                        assignment.ActivityLink.ID = Properties.ActivityType;
                                        assignment.EmployeeLink.ID = emp.ID;
                                        assignment.Date = date;
                                        assignment.JobLink.ID = jobid;
                                        assignment.Booked.Start = start;
                                        assignment.Booked.Finish = finish;
                                        assignment.Booked.Duration = finish - start;
                                        updates.Add(assignment);
                                        adjustment[idx] += assignment.Booked.Duration.TotalHours;
                                    }
                                }
                            }
                            if(Properties.DisplayMode == JobPlannerDisplayMode.JobColumns)
                            {
                                System.Data.DataRow row = table.Rows[dateIdx];
                                row.BeginEdit();
                                foreach(var (idx, jobid) in jobIDs.WithIndex())
                                {
                                    var adj = adjustment[idx];

                                    _available[dateIdx] = Math.Max(0F, _available[dateIdx] - (adj / Properties.HoursPerDay));
                                    row["Available"] = _available[dateIdx];

                                    double jobvalue = (row[jobid.ToString()] == DBNull.Value)
                                        ? adj / Properties.HoursPerDay
                                        : (double)row[jobid.ToString()] + (adj / Properties.HoursPerDay);
                                    row[jobid.ToString()] = jobvalue <= 0F ? null : jobvalue;
                                }
                                row.EndEdit();
                            }
                            else
                            {
                                var availableRow = table.Rows[0];
                                availableRow.BeginEdit();

                                foreach(var (idx, jobid) in jobIDs.WithIndex())
                                {
                                    var job = _jobs.WithIndex().First(x => x.Value.ID == jobid);
                                    var row = table.Rows[job.Key + 1];

                                    var adj = adjustment[idx];

                                    _available[dateIdx] = Math.Max(0F, _available[dateIdx] - (adj / Properties.HoursPerDay));
                                    availableRow[dateIdx.ToString()] = _available[dateIdx];

                                    row.BeginEdit();
                                    double jobvalue = (row[dateIdx.ToString()] == DBNull.Value)
                                        ? adj / Properties.HoursPerDay
                                        : (double)row[dateIdx.ToString()] + (adj / Properties.HoursPerDay);
                                    row[dateIdx.ToString()] = jobvalue <= 0F ? null : jobvalue;
                                    row.EndEdit();
                                }
                                availableRow.EndEdit();

                                foreach(var row in table.Rows.Cast<System.Data.DataRow>())
                                {
                                    row.BeginEdit();
                                    row[dateIdx.ToString()] = row[dateIdx.ToString()];
                                    row.EndEdit();
                                }
                            }
                        }
                    }

                    var entry = AvailableEmployees.Items.FirstOrDefault(x => x.ID == available.ID);
                    if (entry != null)
                    {
                        AvailableEmployees.Items.Remove(entry);
                        GetEmployee(entry.ID, AssignedEmployees.Items).Time += entry.Time;
                    }
                }

                if (updates.Any())
                {
                    using (new WaitCursor())
                    {
                        new Client<Assignment>().Save(updates, "Assigned by Job Planner");
                        
                        CoreTable temp = new CoreTable();
                        temp.LoadColumns(typeof(Assignment));
                        temp.LoadRows(updates);
                        _assignments.AddRange(temp.Rows.Select(r => new AssignmentModel(r)));
                        
                        AssignedEmployees.Refresh(false, true);
                        AvailableEmployees.Refresh(false, true);
                    }
                }
            }
        }
    }

    private void AssignedEmployees_OnOnAction(object sender, JobPlannerEmployee[] employees)
    {
        if (ExtractSelection(out var jobIDs, out var dates))
        {
            if (dataGrid.ItemsSource is DataTable table)
            {
                foreach (var date in dates)
                {
                    var dateIdx = _dates.IndexOf(date);

                    var emptimes = _assignments.Where(x =>
                        jobIDs.Contains(x.JobID)
                        && (x.Date == date)
                        && employees.Any(e => e.ID == x.EmployeeID)
                    ).ToArray();
                    var emptime = emptimes.Aggregate(TimeSpan.Zero, (time, ass) => time += ass.BookedDuration);
                    if(Properties.DisplayMode == JobPlannerDisplayMode.JobColumns)
                    {
                        System.Data.DataRow row = table.Rows[dateIdx];
                        row.BeginEdit();
                        foreach(var jobid in jobIDs)
                        {
                            _available[dateIdx] = _available[dateIdx] + (emptime.TotalHours / Properties.HoursPerDay);
                            row["Available"] = _available[dateIdx];

                            double value = (row[jobid.ToString()] == DBNull.Value)
                                ? 0.0F
                                : (double)row[jobid.ToString()] - (emptime.TotalHours / Properties.HoursPerDay);
                            row[jobid.ToString()] = value <= 0F ? null : value;
                        }
                        row.EndEdit();
                    }
                    else
                    {
                        var availableRow = table.Rows[0];
                        availableRow.BeginEdit();

                        foreach(var jobid in jobIDs)
                        {
                            var jobIdx = _jobs.WithIndex().First(x => x.Value.ID == jobid).Key;

                            _available[dateIdx] = _available[dateIdx] + (emptime.TotalHours/Properties.HoursPerDay);
                            availableRow[dateIdx.ToString()] = _available[dateIdx];

                            var row = table.Rows[jobIdx + 1];
                            row.BeginEdit();

                            double value = (row[dateIdx.ToString()] == DBNull.Value)
                                ? 0.0F
                                : (double)row[dateIdx.ToString()] - (emptime.TotalHours / Properties.HoursPerDay);
                            row[dateIdx.ToString()] = value <= 0F ? null : value;
                            row.EndEdit();
                        }

                        availableRow.EndEdit();

                        foreach(var row in table.Rows.Cast<System.Data.DataRow>())
                        {
                            row.BeginEdit();
                            row[dateIdx.ToString()] = row[dateIdx.ToString()];
                            row.EndEdit();
                        }
                    }
                }
            }
            
            var assignments = _assignments.Where(x =>
                jobIDs.Contains(x.JobID)
                && dates.Contains(x.Date)
                && employees.Any(e => e.ID == x.EmployeeID)
            ).ToArray();
            if (assignments.Any())
            {
                using (new WaitCursor())
                {
                    var deletes = assignments.Select(x => new Assignment() { ID = x.ID }).ToArray();
                    new Client<Assignment>().Delete(deletes, "Deleted from Job Planner");
                    
                    var removes = AssignedEmployees.Items.Where(x => employees.Any(e => e.ID == x.ID)).ToArray();
                    foreach (var remove in removes)
                    {
                        GetEmployee(remove.ID, AvailableEmployees.Items).Time += remove.Time;
                        AssignedEmployees.Items.Remove(remove);
                    }
                    
                    foreach (var assignment in assignments)
                        _assignments.Remove(assignment);
                    
                    AssignedEmployees.Refresh(false, true);
                    AvailableEmployees.Refresh(false, true);
                    

                }
            }
            

        }
    }

    private void LeaveType_OnSelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        if (EventSuppressor.IsSet(Suppress.This))
            return;
        Properties.IncludeUnApprovedLeave = LeaveType.SelectedIndex > 0;
        DoSaveSettings();
        Refresh();
    }
    
    
    private void Orientation_OnSelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        if (EventSuppressor.IsSet(Suppress.This))
            return;
        Properties.DisplayMode = Orientation.SelectedIndex <= 0
            ? JobPlannerDisplayMode.DateColumns
            : JobPlannerDisplayMode.JobColumns;
        DoSaveSettings();
        Refresh();
    }

    private void AvailableEmployees_OnAfterRefresh(object sender, AfterRefreshEventArgs args)
    {
        AvailableEmployees.Items = AvailableEmployees.Items.OrderBy(x => x.Name).ToList();
    }

    private void AssignedEmployees_OnAfterRefresh(object sender, AfterRefreshEventArgs args)
    {
        AssignedEmployees.Items = AssignedEmployees.Items.OrderBy(x => x.Name).ToList();
    }

}