using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media.Imaging;
using System.Windows.Threading;
using Comal.Classes;
using InABox.Clients;
using InABox.Core;
using InABox.DynamicGrid;
using InABox.WPF;
using Syncfusion.UI.Xaml.Kanban;

namespace PRSDesktop
{
    /// <summary>
    ///     Interaction logic for AttendancePanel.xaml
    /// </summary>
    public partial class AttendancePanel : UserControl, IPanel<TimeSheet>
    {
        private string _search = "";
        public CoreTable Activities;

        private bool bIncludeInactive;

        private readonly DispatcherTimer columnsizer = new();

        public CoreTable Employees;

        private readonly List<AttendanceKanban> Kanbans = new();
        public CoreTable LeaveRequests;
        public CoreTable TimeSheets;

        public AttendancePanel()
        {
            InitializeComponent();
            columnsizer.Interval = new TimeSpan(0, 0, 0, 0, 500);
            columnsizer.Tick += Columnsizer_Tick;
            columnsizer.IsEnabled = true;
        }

        public bool IsReady { get; set; }

        public event DataModelUpdateEvent OnUpdateDataModel;

        public Dictionary<string, object[]> Selected()
        {
            return new Dictionary<string, object[]>
            {
                { typeof(Employee).EntityName(), Employees.Rows.ToArray() },
                { typeof(TimeSheet).EntityName(), TimeSheets.Rows.ToArray() }
            };
        }

        public void CreateToolbarButtons(IPanelHost host)
        {
        }

        public string SectionName => "Attendance";

        public DataModel DataModel(Selection selection)
        {
            var ids = selection != Selection.None ? Employees.ExtractValues<Employee, Guid>(x => x.ID).ToArray() : new Guid[] { };
            var filter = new Filter<Employee>(x => x.ID).InList(ids);
            if (!bIncludeInactive)
            {
                filter.And(x => x.ShowOnInOutBoard);
            }
            return new AttendanceDataModel(filter);
        }

        public void Refresh()
        {
            using (var cursor = new WaitCursor())
            {
                var query = new MultiQuery();

                query.Add(
                    new Filter<TimeSheet>(x => x.Date).IsEqualTo(DateTime.Today),
                    new Columns<TimeSheet>(x => x.EmployeeLink.ID)
                        .Add(x => x.Start)
                        .Add(x => x.Finish)
                        .Add(x => x.Address)
                        .Add(x => x.ActivityLink.ID)
                        .Add(x => x.SoftwareVersion),
                    new SortOrder<TimeSheet>(x => x.Start)
                );

                query.Add(
                    new Filter<LeaveRequest>(x => x.From).IsLessThanOrEqualTo(DateTime.Today)
                        .And(x => x.To).IsGreaterThanOrEqualTo(DateTime.Today)
                        .And(x => x.Status).IsEqualTo(LeaveRequestStatus.InProgress),
                    new Columns<LeaveRequest>(x => x.EmployeeLink.ID)
                        .Add(x => x.From)
                        .Add(x => x.FromTime)
                        .Add(x => x.To)
                        .Add(x => x.ToTime)
                        .Add(x => x.LeaveType.ID)
                );

                query.Query();

                TimeSheets = query.Get<TimeSheet>();
                LeaveRequests = query.Get<LeaveRequest>();

                foreach (var emprow in Employees.Rows)
                {
                    var empid = emprow.Get<Employee, Guid>(c => c.ID);

                    var kanban = Kanbans.FirstOrDefault(x => string.Equals(x.ID, empid.ToString()));
                    if (kanban != null)
                    {
                        var bOK = CheckTimeSheet(empid, kanban);
                        if (!bOK)
                            bOK = CheckLeave(empid, kanban);
                        if (!bOK)
                            UpdateKanban(kanban,
                                TimeSpan.MinValue,
                                TimeSpan.MinValue,
                                "",
                                "White",
                                "Gainsboro",
                                "",
                                ""
                            );
                    }
                }

                FilterKanbans();
            }
        }

        public void Setup()
        {
            Kanban.Columns.Clear();

            var filter = LookupFactory.DefineFilter<Employee>(); //.And(x=>x.Type).IsEqualTo(EmployeeType.Employee);

            var tables = Client.QueryMultiple(
                new KeyedQueryDef<Employee>(
                    filter,
                    new Columns<Employee>(
                        x => x.ID,
                        x => x.Name,
                        x => x.Thumbnail.ID,
                        x => x.Group.ID,
                        x => x.Group.Description,
                        x => x.Type,
                        x => x.UsualStart,
                        x => x.UsualFinish,
                        x => x.ShowOnInOutBoard
                    ),
                    new SortOrder<Employee>(x => x.Name)),
                new KeyedQueryDef<Activity>());

            Employees = tables[nameof(Employee)];
            Activities = tables[nameof(Activity)];

            CreateColumns();

            CreateKanbans();

            var imageids = Employees.Rows
                .Select(r => r.EntityLinkID<Employee, ImageDocumentLink>(x => x.Thumbnail) ?? Guid.Empty)
                .Where(x => x != Guid.Empty).ToArray();
            new Client<Document>().Query(
                new Filter<Document>(x => x.ID).InList(imageids),
                new Columns<Document>(
                    x => x.ID,
                    x => x.Data
                ),
                null,
                (data, error) => ProcessImages(data)
            );
        }

        public void Shutdown()
        {
        }

        public void Heartbeat(TimeSpan time)
        {
        }

        private void Columnsizer_Tick(object sender, EventArgs e)
        {
            columnsizer.IsEnabled = false;
            ResizeColumns();
            columnsizer.IsEnabled = true;
        }

        private void ResizeColumns()
        {
            using (var d = Dispatcher.DisableProcessing())
            {
                var CollapsedWidth = 50;
                var CollapsedColumns = 0;
                Array.ForEach(Kanban.Columns.ToArray(), x => { CollapsedColumns += x.IsExpanded ? 0 : 1; });
                if (Kanban.Columns.Count > 0 && CollapsedColumns != Kanban.Columns.Count)
                {
                    var ColumnWidth = (Kanban.ActualWidth - CollapsedColumns * CollapsedWidth) / (Kanban.Columns.Count - CollapsedColumns) - 2;
                    if (ColumnWidth != Kanban.ColumnWidth) Kanban.ColumnWidth = ColumnWidth;
                }
            }
        }

        private void CreateKanbans()
        {
            foreach (var row in Employees.Rows)
            {
                var empid = row.Get<Employee, Guid>(x => x.ID);
                var empname = row.Get<Employee, string>(x => x.Name);
                var groupid = row.Get<Employee, Guid>(x => x.Group.ID);
                var imgid = row.Get<Employee, Guid>(x => x.Thumbnail.ID);
                var img = PRSDesktop.Resources.anonymous.AsBitmapImage();
                var active = row.Get<Employee, bool>(x => x.ShowOnInOutBoard);
                var color = "White";

                var kanban = new AttendanceKanban
                {
                    ID = empid.ToString(),
                    Name = empname,
                    Category = groupid.ToString(),
                    Image = img,
                    Clockin = "",
                    Clockout = "",
                    Address = "",
                    ColorKey = "White",
                    TextColor = "Gainsboro",
                    Type = "",
                    Version = "",
                    Active = active
                };
                Kanbans.Add(kanban);
            }
        }

        private void CreateColumns()
        {
            //Dictionary<Guid, String> columns = Employees.ToDictionary<Employee, Guid>(x => x.ID, new System.Linq.Expressions.Expression<Func<Employee, object>>[] { x => x.Group.Description });
            Kanban.Columns.Clear();
            var columns = new List<Tuple<Guid, string>>();

            foreach (var row in Employees.Rows)
            {
                var active = row.Get<Employee, bool>(c => c.ShowOnInOutBoard);
                if (bIncludeInactive || active)
                {
                    var id = row.Get<Employee, Guid>(c => c.Group.ID);
                    var desc = row.Get<Employee, string>(c => c.Group.Description);
                    if (!columns.Any(x => x.Item1.Equals(id)))
                        columns.Add(new Tuple<Guid, string>(id, desc));
                }
            }

            columns = columns.OrderBy(x => x.Item2).ToList();
            foreach (var column in columns)
            {
                var newcol = new KanbanColumn
                {
                    Title = column.Item1 != Guid.Empty ? column.Item2 : "(No Group Assigned)",
                    Categories = column.Item1.ToString()
                };
                newcol.AllowDrag = false;
                newcol.AllowDrop = false;
                Kanban.Columns.Add(newcol);
            }
        }

        private void UpdateKanban(AttendanceKanban kanban, TimeSpan start, TimeSpan finish, string address, string background, string foreground,
            string description, string version)
        {
            kanban.Clockin = start.TotalMilliseconds > 0 ? string.Format("{0:hh\\:mm}", start) : "";
            kanban.Clockout = finish.TotalMilliseconds > 0 ? string.Format("{0:hh\\:mm}", finish) : "";
            kanban.Address = address;
            kanban.ColorKey = background;
            kanban.TextColor = foreground;
            kanban.Type = description;
            kanban.Version = version;
        }

        private bool CheckTimeSheet(Guid empid, AttendanceKanban kanban)
        {
            var firstrow = TimeSheets.Rows.FirstOrDefault(r => r.Get<TimeSheet, Guid>(c => c.EmployeeLink.ID).Equals(empid));
            if (firstrow == null)
                return false;

            var lastrow = TimeSheets.Rows.LastOrDefault(r => r.Get<TimeSheet, Guid>(c => c.EmployeeLink.ID).Equals(empid));

            var actid = lastrow.Get<TimeSheet, Guid>(c => c.ActivityLink.ID);
            var actrow = Equals(actid, Guid.Empty) ? null : Activities.Rows.FirstOrDefault(r => r.Get<Activity, Guid>(c => c.ID).Equals(actid));

            var color = "White";
            var finish = lastrow.Get<TimeSheet, TimeSpan>(c => c.Finish);
            if (finish.Ticks > 0 && finish < DateTime.Now - DateTime.Today)
            {
                color = "Gainsboro";
            }
            else
            {
                color = actrow != null ? actrow.Get<Activity, string>(c => c.Color) : "";
                if (string.IsNullOrWhiteSpace(color))
                    color = "LightGreen";
            }

            UpdateKanban(kanban,
                firstrow.Get<TimeSheet, TimeSpan>(c => c.Start),
                lastrow.Get<TimeSheet, TimeSpan>(c => c.Finish),
                lastrow.Get<TimeSheet, string>(c => c.Address),
                color,
                kanban.TextColor = "Black",
                actrow != null ? actrow.Get<Activity, string>(c => c.Description) : "",
                lastrow.Get<TimeSheet, string>(c => c.SoftwareVersion)
            );
            //kanban.Clockin = firstrow != null ? String.Format("{0:hh\\:mm}", firstrow.Get<TimeSheet, TimeSpan>(c => c.Start)) : "";
            //kanban.Clockout = (lastrow != null) && (lastrow.Get<TimeSheet, TimeSpan>(c => c.Finish).Ticks > 0) ? String.Format("{0:hh\\:mm}", lastrow.Get<TimeSheet, TimeSpan>(c => c.Finish)) : "";
            //kanban.Address = lastrow != null ? lastrow.Get<TimeSheet, String>(c => c.Address) : "";
            //kanban.ColorKey = color;
            //kanban.TextColor = lastrow != null ? "Black" : "Gainsboro";
            //kanban.Type = actrow != null ? actrow.Get<Activity, String>(c => c.Description) : "";
            //kanban.Version = lastrow != null ? lastrow.Get<TimeSheet, String>(c => c.SoftwareVersion) : "";
            return true;
        }

        private bool CheckLeave(Guid empid, AttendanceKanban kanban)
        {
            var row = LeaveRequests.Rows.FirstOrDefault(r => r.Get<LeaveRequest, Guid>(c => c.EmployeeLink.ID) == empid);
            if (row == null)
                return false;

            var actid = row.Get<LeaveRequest, Guid>(c => c.LeaveType.ID);
            var actrow = Equals(actid, Guid.Empty) ? null : Activities.Rows.FirstOrDefault(r => r.Get<Activity, Guid>(c => c.ID).Equals(actid));
            var color = actrow?.Get<Activity, string>(c => c.Color);
            if (string.IsNullOrWhiteSpace(color))
                color = "Gainsboro";

            var description = actrow?.Get<Activity, string>(c => c.Description);
            if (string.IsNullOrWhiteSpace(description))
                description = "Leave";

            UpdateKanban(kanban,
                row.Get<LeaveRequest, DateTime>(c => c.From) == DateTime.Today
                    ? row.Get<LeaveRequest, TimeSpan>(c => c.FromTime)
                    : TimeSpan.MinValue,
                row.Get<LeaveRequest, DateTime>(c => c.To) == DateTime.Today
                    ? row.Get<LeaveRequest, TimeSpan>(c => c.ToTime)
                    : TimeSpan.MinValue,
                "",
                color,
                kanban.TextColor = "Black",
                description,
                ""
            );
            return true;
        }

        private void FilterKanbans()
        {
            var visible = Kanbans.Where(x =>
                (x.Name?.ToUpper().Contains(_search.ToUpper()) == true || x.Address?.ToUpper().Contains(_search.ToUpper()) == true)
                && (bIncludeInactive || x.Active)
            );
            Kanban.ItemsSource = visible;
        }

        private void ProcessImages(CoreTable data)
        {
            foreach (var row in data.Rows)
            {
                var imageid = row.Get<Document, Guid>(c => c.ID);
                BitmapImage img = null;
                var empids = Employees.Rows.Where(r => r.Get<Employee, Guid>(c => c.Thumbnail.ID).Equals(imageid))
                    .Select(r => r.Get<Employee, Guid>(c => c.ID));
                foreach (var empid in empids)
                {
                    var kanban = Kanbans.FirstOrDefault(x => string.Equals(x.ID, empid.ToString()));
                    if (kanban != null)
                    {
                        if (img == null)
                        {
                            img = new BitmapImage();
                            img.LoadImage(row.Get<Document, byte[]>(c => c.Data));
                        }

                        kanban.Image = img;
                    }
                }
            }

            Dispatcher.Invoke(() => { FilterKanbans(); });
        }

        private void AttendanceMenu_Opened(object sender, RoutedEventArgs e)
        {
            var menu = sender as ContextMenu;
            var model = menu.Tag as AttendanceKanban;

            var sick = menu.Items[0] as MenuItem;

            var onoff = menu.Items[2] as MenuItem;

            if (string.IsNullOrWhiteSpace(model.Clockin) || !string.IsNullOrWhiteSpace(model.Clockout))
                onoff.Header = "Clock Employee On to PRS";
            else
                onoff.Header = "Clock Employee Out of PRS";

            var show = menu.Items[4] as MenuItem;
            show.Visibility = !model.Active ? Visibility.Visible : Visibility.Collapsed;

            var hide = menu.Items[5] as MenuItem;
            hide.Visibility = model.Active ? Visibility.Visible : Visibility.Collapsed;
        }

        private void SickLeave_Click(object sender, RoutedEventArgs e)
        {
            var actrow = Activities.Rows.FirstOrDefault(
                r => r.Get<Activity, bool>(c => c.IsLeave) && r.Get<Activity, bool>(c => c.IsDefault)
            );
            if (actrow == null)
            {
                MessageBox.Show("You must set up a default Sick Leave Activity before using this option!");
                return;
            }

            var item = (MenuItem)sender;
            var model = (AttendanceKanban)item.Tag;
            var empid = Guid.Parse(model.ID);

            var row = Employees.Rows.FirstOrDefault(r => r.Get<Employee, Guid>(c => c.ID).Equals(empid));
            if (row == null)
            {
                MessageBox.Show("Cannot Find Employee: " + empid);
                return;
            }

            var emp = row.ToObject<Employee>();
            var request = new LeaveRequest();
            request.EmployeeLink.ID = empid;
            request.From = DateTime.Today;
            request.FromTime = DateTime.Now.TimeOfDay;
            request.To = DateTime.Today;
            request.ToTime = emp.UsualFinish != TimeSpan.FromMilliseconds(0) ? emp.UsualFinish : new TimeSpan(23, 59, 59);
            request.Status = LeaveRequestStatus.InProgress;
            request.LeaveType.ID = actrow.Get<Activity, Guid>(c => c.ID);
            request.Notes = string.Format("Marked As Sick at {0:hh\\:mm} by {1}", DateTime.Now, ClientFactory.UserID);

            if (new LeaveRequests().EditItems(new[] { request }))
                Refresh();
        }

        private void ClockOnOff_Click(object sender, RoutedEventArgs e)
        {
            var item = (MenuItem)sender;
            var model = (AttendanceKanban)item.Tag;
            var empid = Guid.Parse(model.ID);

            var bOK = true;
            var time = new TimeSpan(DateTime.Now.Hour, DateTime.Now.Minute, 0);
            if (Security.IsAllowed<CanChangeStartFinishTimes>())
                bOK = TimeEdit.Execute("Enter Time", ref time);

            if (!bOK)
                return;

            if (string.IsNullOrWhiteSpace(model.Clockin) || !string.IsNullOrWhiteSpace(model.Clockout))
            {
                var timesheet = new TimeSheet();
                timesheet.EmployeeLink.ID = empid;
                timesheet.Date = DateTime.Today;
                timesheet.Start = time;
                timesheet.Notes = string.Format("Clocked in at {0:hh\\:mm} by {1}", DateTime.Now, ClientFactory.UserID);
                new Client<TimeSheet>().Save(timesheet, "Clocked on from In/Out Board");
                Refresh();
            }
            else
            {
                var timesheet = new Client<TimeSheet>().Load(
                    new Filter<TimeSheet>(x => x.Date).IsEqualTo(DateTime.Today).And(x => x.Finish).IsEqualTo(new TimeSpan())
                        .And(x => x.EmployeeLink.ID)
                        .IsEqualTo(empid),
                    new SortOrder<TimeSheet>(x => x.Start)
                ).LastOrDefault();
                if (timesheet != null)
                {
                    if (!string.IsNullOrWhiteSpace(timesheet.Notes))
                        timesheet.Notes = timesheet.Notes + "\n";
                    else
                        timesheet.Notes = "";
                    timesheet.Notes = string.Format("{0}Clocked out at {1:hh\\:mm} by {2}", timesheet.Notes, DateTime.Now, ClientFactory.UserID);
                    timesheet.Finish = time;
                    new Client<TimeSheet>().Save(timesheet, "Clocked off from In/Out Board");
                    Refresh();
                }
            }
        }

        private void Search_KeyUp(object sender, KeyEventArgs e)
        {
            _search = Search.Text;
            if (string.IsNullOrWhiteSpace(Search.Text) || e.Key == Key.Return) FilterKanbans();
        }

        private void Export_Click(object sender, RoutedEventArgs e)
        {
            var form = new DynamicExportForm(typeof(TimeSheet), TimeSheets.Columns.Select(x => x.ColumnName));
            if (form.ShowDialog() != true)
                return;
            var export = new Client<TimeSheet>().Query(
                new Filter<TimeSheet>(x => x.Date).IsEqualTo(DateTime.Today),
                new Columns<TimeSheet>(form.Fields),
                LookupFactory.DefineSort<TimeSheet>()
            );
            ExcelExporter.DoExport<TimeSheet>(export, string.Format("Attendance {0:dd-MMM-yy}", DateTime.Today));
        }

        private void ShowAll_Click(object sender, RoutedEventArgs e)
        {
            if (string.Equals(ShowAll.Content as string, "Show All"))
            {
                ShowAll.Content = "Hide Inactive";
                bIncludeInactive = true;
            }
            else
            {
                ShowAll.Content = "Show All";
                bIncludeInactive = false;
            }

            FilterKanbans();
        }

        private void ShowOnInOut_Click(object sender, RoutedEventArgs e)
        {
            var menu = sender as MenuItem;
            var model = menu.Tag as AttendanceKanban;
            UpdateInOutStatus(model, true);
        }

        private void UpdateInOutStatus(AttendanceKanban model, bool include)
        {
            var id = Guid.Parse(model.ID);
            var row = Employees.Rows.FirstOrDefault(r => r.Get<Employee, Guid>(c => c.ID) == id);
            if (row != null)
            {
                var emp = new Employee { ID = id, ShowOnInOutBoard = include };
                new Client<Employee>().Save(emp, include ? "Added To" : "Removed From" + " In/Out Board", (o, e) => { });
                row.Set<Employee, bool>(x => x.ShowOnInOutBoard, include);
                model.Active = include;
            }
        }

        private void RemoveFromInOut_Click(object sender, RoutedEventArgs e)
        {
            var menu = sender as MenuItem;
            var model = menu.Tag as AttendanceKanban;
            UpdateInOutStatus(model, false);
            FilterKanbans();
        }
    }
}