using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using Comal.Classes;
using InABox.Clients;
using InABox.Configuration;
using InABox.Core;
using InABox.DynamicGrid;
using InABox.WPF;
using Syncfusion.Pdf.Graphics;
using Syncfusion.Pdf;
using System.Windows.Data;
using System.Windows.Media;
using System.Drawing;
using System.Globalization;

namespace PRSDesktop
{
    public class TaskPanelProperties : BaseObject, IGlobalConfigurationSettings
    {
        [CheckBoxEditor(ToolTip = "Require that all tasks are given a task type.")]
        public bool RequireTaskTypes { get; set; } = false;
    }

    /// <summary>
    ///     Interaction logic for TaskPanel.xaml
    /// </summary>
    public partial class TaskPanel : UserControl, IPanel<Kanban>, ITaskHost, IJobControl, IPropertiesPanel<TaskPanelProperties>
    {
        private bool _bTabChanging;
        public Guid MyID { get; set; } = CoreUtils.FullGuid;

        private KanbanType[] kanbanTypes = null!; // Initialized in Setup()

        public IList<KanbanType> KanbanTypes => kanbanTypes;

        public TaskPanel()
        {
            InitializeComponent();
            
            foreach (TabItem tab in TaskPanels.Items)
            {
                var panel = (tab.Content as ITaskControl)!;
                _viewmap[panel.KanbanViewType] = tab;
                panel.Host = this;
            }

            if (MyID == CoreUtils.FullGuid)
            {
                var row = new Client<Employee>()
                    .Query(new Filter<Employee>(x => x.UserLink.ID).IsEqualTo(ClientFactory.UserGuid), new Columns<Employee>(x => x.ID)).Rows
                    .FirstOrDefault();
                if (row != null)
                    MyID = row.Get<Employee, Guid>(x => x.ID);
            }
        }


        public Guid ParentID { get; set; }
        
        public JobPanelSettings Settings { get; set; }

        private void ChangeStatus(ITaskControl control, object o, RoutedEventArgs e, string status)
        {
            if (MessageBox.Show($"Are you sure you want to mark the selected tasks as {status}?", "Confirm Change Status",
                    MessageBoxButton.YesNo) != MessageBoxResult.Yes)
                return;
            var tasks = (((MenuItem)e.Source).Tag as IEnumerable<TaskModel>)!;
            Progress.ShowModal("Changing Status", progress =>
            {
                var kanbans = LoadKanbans(tasks, new Columns<Kanban>(x => x.ID, x => x.Completed, x => x.Category));
                foreach (var kanban in kanbans)
                {
                    if(status == "Complete")
                    {
                        kanban.Completed = DateTime.Now;
                    }
                    kanban.Category = status;
                }

                new Client<Kanban>().Save(kanbans, $"Kanban Marked as {status}");
            });
            control.Refresh(true);
        }
        private void CompleteTask(ITaskControl control, RoutedEventArgs e, DateTime completed)
        {
            if (MessageBox.Show($"Are you sure you want to complete the selected tasks?", "Confirm Completion",
                    MessageBoxButton.YesNo) != MessageBoxResult.Yes)
                return;
            var tasks = (((FrameworkElement)e.Source).Tag as IEnumerable<TaskModel>)!;
            Progress.ShowModal("Completing Tasks", progress =>
            {
                var kanbans = LoadKanbans(tasks, new Columns<Kanban>(x => x.ID, x => x.Completed, x => x.Category));
                foreach (var kanban in kanbans)
                {
                    kanban.Completed = completed;
                    kanban.Category = "Complete";
                }

                new Client<Kanban>().Save(kanbans, $"Kanban Marked as Complete");
            });
            control.Refresh(true);
        }
        private void AddChangeStatusButton(ITaskControl control, TaskModel[] models, MenuItem menu, string header, string status)
        {
            var item = new MenuItem
            {
                Tag = models,
                Header = header
            };
            item.Click += (o, e) => ChangeStatus(control, o, e, status);
            menu.Items.Add(item);
        }
        public bool CanChangeTasks(IEnumerable<TaskModel> models)
        {
            foreach (var task in models)
            {
                if (!MyID.Equals(task.ManagerID) && !MyID.Equals(task.EmployeeID))
                {
                    // If you can change others tasks, IsFullControl is true - but we don't check at the beginning of the function
                    // to save checking security tokens every time.
                    return Security.IsAllowed<CanChangeOthersTasks>();
                }
            }
            return true;
        }

        /// <summary>
        /// <paramref name="menu"/> should have <see cref="FrameworkElement.Tag"/> set to a <see cref="TaskModel"/>.
        /// </summary>
        /// <param name="control"></param>
        /// <param name="menu"></param>
        public void PopulateMenu(ITaskControl control, ContextMenu menu)
        {
           menu.Items.Clear();
            
            var models = control.SelectedModels((menu.Tag as TaskModel)!).ToArray();
            var references = GetReferences(models);
            var bLinks = references.Any(x => x.ReferenceType() != null);
            var referencetypes = references.Select(x => x.ReferenceType()).Distinct().ToArray();
            var bSingle = models.Length == 1;
            var canChange = CanChangeTasks(models);

            var edit = new MenuItem
            {
                Tag = models,
                Header = referencetypes.SingleOrDefault() == typeof(Requisition)
                    ? "Edit Requisition Details"
                    : referencetypes.SingleOrDefault() == typeof(Setout)
                        ? "Edit Setout Details"
                        : referencetypes.SingleOrDefault() == typeof(Delivery)
                            ? "Edit Delivery Details"
                            : referencetypes.SingleOrDefault() == typeof(PurchaseOrder)
                                ? "Edit Order Details"
                                : "Edit Task" + (bSingle ? "" : "s")
            };
            edit.Click += (o, e) =>
            {
                var tasks = (((MenuItem)e.Source).Tag as IEnumerable<TaskModel>)!;
                if (EditReferences(tasks))
                    control.Refresh(true);
                e.Handled = true;
            };
            edit.IsEnabled = referencetypes.Length == 1;
            menu.Items.Add(edit);

            if (!bLinks && models.Length == 1)
            {
                var digitalForms = new MenuItem { Header = "Digital Forms" };

                var model = models.First();
                Guid kanbanID = Guid.Parse(model.ID);

                DynamicGridUtils.PopulateFormMenu<KanbanForm, Kanban, KanbanLink>(
                    digitalForms,
                    kanbanID,
                    () => new Client<Kanban>().Load(new Filter<Kanban>(x => x.ID).IsEqualTo(kanbanID)).First(),
                    model.EmployeeID == MyID);

                menu.Items.Add(digitalForms);
            }

            if (!models.Any(x => !x.CompletedDate.IsEmpty()) && !bLinks)
            {
                menu.Items.Add(new Separator());

                var job = new MenuItem
                {
                    Tag = models,
                    Header = "Link to Job"
                };
                job.SubmenuOpened += (o, e) => CreateJobSubMenu(control, job, models);
                menu.Items.Add(job);

                if (bSingle)
                {
                    menu.AddItem("Create Setout from Task", null, models.First(), task =>
                    {
                        var jobID = task.JobID;
                        if (task.JobID.Equals(Guid.Empty))
                        {
                            jobID = ParentID;
                        }

                        if (MessageBox.Show("This will convert this task into a Setout.\n\nDo you wish to continue?", "Confirmation", MessageBoxButton.YesNo) != MessageBoxResult.Yes)
                            return;

                        ManufacturingTemplate? template = new Client<ManufacturingTemplate>()
                            .Load(new Filter<ManufacturingTemplate>(x => x.Code).IsEqualTo("PRS")).FirstOrDefault();
                        if (template == null)
                        {
                            MessageBox.Show("[Pressing] Template does not exist!");
                            return;
                        }

                        string? setoutNumber = null;
                        Kanban? kanban = null;
                        ManufacturingTemplateStage[] tstages = Array.Empty<ManufacturingTemplateStage>();
                        Progress.ShowModal("Creating Setout", (progress) =>
                        {
                            var kanbanFilter = new Filter<Kanban>(x => x.ID).IsEqualTo(task.ID);
                            var tables = Client.QueryMultiple(new Dictionary<string, IQueryDef>
                            {
                                { "ManufacturingTemplateStage", new QueryDef<ManufacturingTemplateStage>(
                                    new Filter<ManufacturingTemplateStage>(x => x.Template.ID).IsEqualTo(template.ID),
                                    null,
                                    new SortOrder<ManufacturingTemplateStage>(x => x.Sequence)) },
                                { "Kanban", new QueryDef<Kanban>(
                                    kanbanFilter,
                                    null,
                                    null) },
                                { "Setout", new QueryDef<Setout>(
                                    new Filter<Setout>(x => x.JobLink.ID)
                                        .InQuery(new SubQuery<Kanban>(kanbanFilter, new Column<Kanban>(x => x.JobLink.ID))),
                                    new Columns<Setout>(x => x.JobLink.JobNumber, x => x.Number),
                                    null) }
                            });

                            tstages = tables["ManufacturingTemplateStage"].Rows
                               .Select(x => x.ToObject<ManufacturingTemplateStage>()).ToArray();
                            kanban = tables["Kanban"].Rows.FirstOrDefault()?.ToObject<Kanban>();
                            if (kanban == null)
                            {
                                MessageBox.Show("Task does not exist!");
                                return;
                            }

                            progress.Report("Creating Setouts");
                            CoreTable setouts = tables["Setout"];

                            int ireq = 0;
                            string sreq = "";
                            while (true)
                            {
                                ireq++;
                                sreq = string.Format("{0}-{1:yyMMdd}-{2}", kanban.JobLink.JobNumber, DateTime.Now, ireq);
                                if (!setouts.Rows.Any(r => sreq.Equals(r.Get<Setout, String>(c => c.Number))))
                                    break;
                            }
                            setoutNumber = sreq;
                        });
                        if (setoutNumber == null || kanban == null)
                        {
                            return;
                        }
                        var result = CreateSetout(
                            task,
                            s =>
                            {
                                s.Number = setoutNumber;
                                s.JobLink.ID = jobID;

                                var notes = kanban.Notes.ToList();
                                var description = kanban.Summary;
                                if (string.IsNullOrWhiteSpace(description))
                                {
                                    description = CoreUtils.StripHTML(kanban.Description);
                                }
                                if (!string.IsNullOrWhiteSpace(description))
                                {
                                    notes.Insert(0, description);
                                }
                                s.Description = string.Join("\n==========================================\n", notes);
                            }
                        );
                        if (result != null)
                        {
                            Progress.ShowModal("Creating Manufacturing Packet", progress =>
                            {
                                ManufacturingPacket packet = new ManufacturingPacket()
                                {
                                    Serial = template.Code,
                                    Title = kanban.Title,
                                    Quantity = 1,
                                    BarcodeQty = 1,
                                    DueDate = kanban.DueDate
                                };
                                packet.ManufacturingTemplateLink.ID = template.ID;
                                packet.ManufacturingTemplateLink.Code = template.Code;
                                packet.ManufacturingTemplateLink.Factory.ID = template.Factory.ID;
                                packet.SetoutLink.ID = result.ID;
                                new Client<ManufacturingPacket>().Save(packet, "Created from Task");

                                DoLink<ManufacturingPacketKanban, ManufacturingPacket, ManufacturingPacketLink>(task, packet.ID);

                                List<ManufacturingPacketStage> pstages = new List<ManufacturingPacketStage>();
                                foreach (var tstage in tstages)
                                {
                                    var pstage = new ManufacturingPacketStage()
                                    {
                                        Time = tstage.Time,
                                        Sequence = tstage.Sequence,
                                        SequenceType = tstage.SequenceType,
                                        Started = DateTime.MinValue,
                                        PercentageComplete = 0.0F,
                                        Completed = DateTime.MinValue,
                                        QualityChecks = tstage.QualityChecks,
                                        QualityStatus = QualityStatus.NotChecked,
                                        QualityNotes = "",
                                    };
                                    pstage.Parent.ID = packet.ID;
                                    pstage.ManufacturingSectionLink.ID = tstage.Section.ID;
                                    pstage.ManufacturingSectionLink.Name = tstage.Section.Name;
                                    pstages.Add(pstage);
                                }
                                new Client<ManufacturingPacketStage>().Save(pstages, "Created from Task", (_, __) => { });

                                progress.Report("Processing Documents");
                                List<SetoutDocument> _setoutdocuments = new List<SetoutDocument>();
                                List<KanbanDocument> _kanbandocuments = new List<KanbanDocument>();
                                KanbanDocument[] docrefs = new Client<KanbanDocument>()
                                    .Load(new Filter<KanbanDocument>(x => x.EntityLink.ID).IsEqualTo(kanban.ID));
                                foreach (var docref in docrefs)
                                {
                                    // Convert the document to a PDF
                                    var docid = ProcessKanbanDocument(docref);
                                    var newdoc = new SetoutDocument();
                                    newdoc.EntityLink.ID = result.ID;
                                    newdoc.DocumentLink.ID = docid;
                                    _setoutdocuments.Add(newdoc);

                                    if (docid != docref.DocumentLink.ID)
                                    {
                                        docref.DocumentLink.ID = docid;
                                        _kanbandocuments.Add(docref);
                                    }
                                }
                                new Client<SetoutDocument>().Save(_setoutdocuments, "Converted from Task", (_, __) => { });
                                new Client<KanbanDocument>().Save(_kanbandocuments, "Converted to PDF", (_, __) => { });

                                progress.Report("Updating Task");
                                kanban.Title = kanban.Title + " (" + result.Number + ")";
                                new Client<Kanban>().Save(kanban, "Converting Kanban to Setout");
                            });
                            control.Refresh(true);
                        }
                    });
                    menu.AddItem("Create Requisition from Task", null, models, tasks =>
                    {
                        var taskModel = tasks.First();

                        var jobID = taskModel.JobID;
                        if (taskModel.JobID.Equals(Guid.Empty))
                        {
                            jobID = ParentID;
                        }

                        var kanbanTable = new Client<Kanban>().Query(new Filter<Kanban>(x => x.ID).IsEqualTo(taskModel.ID));
                        var kanban = kanbanTable.Rows.First().ToObject<Kanban>();

                        var result = CreateRequisition(
                            taskModel,
                            r =>
                            {
                                r.RequestedBy.ID = kanban.ManagerLink.ID;
                                r.Employee.ID = Guid.Empty;
                                r.Title = kanban.Title;

                                r.Request = string.IsNullOrWhiteSpace(kanban.Summary)
                                    ? String.IsNullOrWhiteSpace(kanban.Description)
                                        ? String.Join("\n", kanban.Notes)
                                        : CoreUtils.StripHTML(kanban.Description)
                                    : kanban.Summary;

                                r.Notes = kanban.Notes;
                                r.Due = kanban.DueDate;

                                r.JobLink.ID = jobID;
                            }
                        );
                        if (result != null)
                        {
                            Progress.ShowModal("Updating Documents", progress =>
                            {
                                progress.Report("Updating Documents");
                                List<RequisitionDocument> requiDocuments = new();
                                KanbanDocument[] kanbanDocuments = new Client<KanbanDocument>()
                                    .Load(new Filter<KanbanDocument>(x => x.EntityLink.ID).IsEqualTo(kanban.ID));
                                foreach (var document in kanbanDocuments)
                                {
                                    var newdoc = new RequisitionDocument();
                                    newdoc.EntityLink.ID = result.ID;
                                    newdoc.DocumentLink.ID = document.DocumentLink.ID;
                                    requiDocuments.Add(newdoc);
                                }
                                new Client<RequisitionDocument>().Save(requiDocuments, "Converted from Task", (_, __) => { });

                                /*RequisitionKanban link = new();
                                link.Entity.ID = result.ID;
                                link.Kanban.ID = kanban.ID;
                                new Client<RequisitionKanban>().Save(link, "Converting Task -> Requisition", (_, __) => { });*/

                                progress.Report("Updating Task");
                                kanban.Category = "Open";
                                kanban.Completed = DateTime.MinValue;
                                kanban.Title += $" (Requi #{result.Number})";
                                new Client<Kanban>().Save(kanban, "Converted to Requisition", (_, __) => { });
                            });
                            MessageBox.Show(String.Format("Created Requisition {0}", result.Number));
                            control.Refresh(true);
                        }
                    });
                    menu.AddItem("Create Delivery from Task", null, models, tasks =>
                    {
                        var result = CreateDelivery(
                            tasks.First(),
                            d =>
                            {
                                // Post-Process Requi Here
                            }
                        );
                        if (result != null)
                            control.Refresh(true);
                    });
                    menu.AddItem("Create Purchase Order from Task", null, models, tasks =>
                    {
                        var result = CreateOrder(
                            tasks.First(),
                            p =>
                            {
                                // Post-Process Requi Here
                            }
                        );
                        if (result != null)
                            control.Refresh(true);
                    });
                }
            }

            if (!bLinks && canChange)
            {
                menu.Items.Add(new Separator());

                var changeStatus = new MenuItem { Header = "Change Status" };

                AddChangeStatusButton(control, models, changeStatus, "Open", "Open");
                AddChangeStatusButton(control, models, changeStatus, "In Progress", "In Progress");
                AddChangeStatusButton(control, models, changeStatus, "Waiting", "Waiting");

                if (models.Any(x => x.CompletedDate.IsEmpty()))
                {
                    var complete = new MenuItem
                    {
                        Tag = models,
                        Header = models.Length > 1 ? "Complete Tasks" : "Complete Task"
                    };
                    complete.Click += (o, e) =>
                    {
                        CompleteTask(control, e, DateTime.Now);
                    };
                    menu.Items.Add(complete);

                    if (Security.IsAllowed<CanSetKanbanCompletedDate>())
                    {
                        var completeDate = new MenuItem
                        {
                            Tag = models,
                            Header = "Set Completed Date"
                        };

                        var dateItem = new MenuItem();

                        var dateCalendar = new System.Windows.Controls.Calendar { SelectedDate = DateTime.MinValue };
                        dateCalendar.Tag = models;
                        dateCalendar.SelectedDatesChanged += (o, e) =>
                        {
                            if (e.Source is not System.Windows.Controls.Calendar calendar) return;
                            menu.IsOpen = false;

                            var selectedDate = calendar.SelectedDate ?? DateTime.Now;
                            CompleteTask(control, e, selectedDate);
                        };

                        dateItem.Header = dateCalendar;
                        dateItem.Style = Resources["calendarItem"] as Style;

                        completeDate.Items.Add(dateItem);

                        menu.Items.Add(completeDate);
                    }
                }
                else
                {
                    menu.AddItem(models.Length > 1 ? "Archive Tasks" : "Archive Task", null, models, tasks =>
                    {
                        if (MessageBox.Show("Are you sure you want to remove the selected tasks from the list?", "Confirm removal",
                                MessageBoxButton.YesNo) != MessageBoxResult.Yes)
                            return;

                        Progress.ShowModal("Closing Kanbans", progress =>
                        {
                            var kanbans = LoadKanbans(tasks, new Columns<Kanban>(x => x.ID, x => x.Closed));
                            foreach (var kanban in kanbans)
                                kanban.Closed = DateTime.Now;
                            new Client<Kanban>().Save(kanbans, "Kanban Marked as Closed");
                        });
                        control.Refresh(true);
                    });
                }

                menu.Items.Add(changeStatus);

                var changeType = new MenuItem { Header = "Change Task Type", Tag = models };

                foreach(var type in KanbanTypes)
                {
                    changeType.AddItem($"{type.Code}: {type.Description}", null, type, type =>
                    {
                        Progress.ShowModal("Changing Task Type", progress =>
                        {
                            var kanbans = LoadKanbans(models, new Columns<Kanban>(x => x.ID, x => x.Type.ID));
                            foreach (var kanban in kanbans)
                            {
                                kanban.Type.ID = type.ID;
                            }

                            new Client<Kanban>().Save(kanbans, $"Kanban Task Type changed to {type}");
                        });
                        control.Refresh(true);
                    });
                }

                menu.Items.Add(changeType);


                var changeDueDate = new MenuItem { Header = "Change Due Date" };

                var calendarItem = new MenuItem();

                var calendar = new System.Windows.Controls.Calendar { SelectedDate = models.Length == 1 ? models[0].DueDate : DateTime.Today };
                calendar.Tag = models;
                calendar.SelectedDatesChanged += (o, e) =>
                {
                    if (e.Source is not System.Windows.Controls.Calendar calendar) return;

                    var selectedDate = calendar.SelectedDate ?? DateTime.Now;
                    var models = (calendar.Tag as IList<TaskModel>)!;
                    Progress.ShowModal("Changing Due Date", progress =>
                    {
                        var kanbans = LoadKanbans(models, new Columns<Kanban>(x => x.ID, x => x.DueDate));
                        foreach (var kanban in kanbans)
                        {
                            kanban.DueDate = selectedDate;
                        }

                        new Client<Kanban>().Save(kanbans, $"Kanban Due Date changed to {selectedDate:dd MMM yyyy}");
                    });
                    control.Refresh(true);

                    menu.IsOpen = false;
                };

                calendarItem.Header = calendar;
                calendarItem.Style = Resources["calendarItem"] as Style;

                changeDueDate.Items.Add(calendarItem);

                menu.Items.Add(changeDueDate);
            }
        }

        /// <summary>
        /// Takes a <see cref="KanbanDocument"/>, and if it is a .txt or an image (".png", ".jpg", ".jpeg" or ".bmp"), converts to a PDF
        /// with the content of the document, saving a new document with extension changed to ".pdf".
        /// </summary>
        /// <param name="docref">The original document.</param>
        /// <returns>
        /// The ID of the new <see cref="Document"/> or,
        /// if not one of the given types, the original document ID.
        /// </returns>
        private static Guid ProcessKanbanDocument(KanbanDocument docref)
        {
            var result = docref.DocumentLink.ID;

            var ext = System.IO.Path.GetExtension(docref.DocumentLink.FileName).ToLower();

            if (ext.EndsWith("txt"))
            {
                var doc = new Client<Document>().Load(new Filter<Document>(x => x.ID).IsEqualTo(docref.DocumentLink.ID)).FirstOrDefault();
                if (doc is null)
                {
                    Logger.Send(LogType.Error, "", $"Document {docref.DocumentLink.ID} does not exist!");
                    return docref.DocumentLink.ID;
                }

                PdfDocument pdf = new PdfDocument();
                PdfPage page = pdf.Pages.Add();
                PdfGraphics graphics = page.Graphics;
                PdfFont font = new PdfStandardFont(PdfFontFamily.Courier, 12);
                String text = System.Text.Encoding.UTF8.GetString(doc.Data);
                graphics.DrawString(text, font, PdfBrushes.Black, new PointF(0, 0));
                MemoryStream ms = new MemoryStream();
                pdf.Save(ms);
                pdf.Close(true);
                byte[] data = ms.ToArray();
                var newdoc = new Document()
                {
                    Data = data,
                    FileName = System.IO.Path.ChangeExtension(docref.DocumentLink.FileName, "pdf"),
                    CRC = CoreUtils.CalculateCRC(data),
                    TimeStamp = DateTime.Now,
                };
                new Client<Document>().Save(newdoc, "Converted from Text");
                return newdoc.ID;
            }

            else if (ext.EndsWith("png") || ext.EndsWith("bmp") || ext.EndsWith("jpg") || ext.EndsWith("jpeg"))
            {
                var doc = new Client<Document>().Load(new Filter<Document>(x => x.ID).IsEqualTo(docref.DocumentLink.ID)).FirstOrDefault();
                if (doc is null)
                {
                    Logger.Send(LogType.Error, "", $"Document {docref.DocumentLink.ID} does not exist!");
                    return docref.DocumentLink.ID;
                }

                PdfBitmap image = new PdfBitmap(new MemoryStream(doc.Data));
                PdfDocument pdf = new PdfDocument();
                pdf.PageSettings.Orientation = image.Height > image.Width ? PdfPageOrientation.Portrait : PdfPageOrientation.Landscape;
                pdf.PageSettings.Size = new SizeF(image.Width, image.Height);
                PdfPage page = pdf.Pages.Add();
                PdfGraphics graphics = page.Graphics;
                graphics.DrawImage(image, 0.0F, 0.0F);
                MemoryStream ms = new MemoryStream();
                pdf.Save(ms);
                pdf.Close(true);
                byte[] data = ms.ToArray();
                var newdoc = new Document()
                {
                    Data = data,
                    FileName = System.IO.Path.ChangeExtension(docref.DocumentLink.FileName, "pdf"),
                    CRC = CoreUtils.CalculateCRC(data),
                    TimeStamp = DateTime.Now,
                };
                new Client<Document>().Save(newdoc, "Converted from Image");
                return newdoc.ID;
            }

            return result;
        }

        private void TaskPanels_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (!IsReady)
                return;

            if (e.Source is not TabControl)
                return;

            if (_bTabChanging)
                return;
            try
            {
                _bTabChanging = true;
                var panel = GetCurrentPanel();
                if(panel is not null)
                {
                    KanbanSettings.ViewType = panel.KanbanViewType;
                    new UserConfiguration<KanbanSettings>().Save(KanbanSettings);
                    panel.Refresh(false);
                }
            }
            finally
            {
                _bTabChanging = false;
            }
        }

        private void CreateJobSubMenu(ITaskControl control, MenuItem job, IEnumerable<TaskModel> tasks)
        {
            job.Items.Clear();
            job.Items.Add(new MenuItem { Header = "Loading...", IsEnabled = false });
            using (new WaitCursor())
            {
                job.Items.Clear();
                var jobs = new Client<Job>().Query(
                    LookupFactory.DefineFilter<Job>(),
                    LookupFactory.DefineColumns<Job>(),
                    LookupFactory.DefineSort<Job>()
                );
                foreach (var row in jobs.Rows)
                {
                    var jobNumber = row.Get<Job, string>(x => x.JobNumber);
                    var jobName = row.Get<Job, string>(x => x.Name);
                    job.AddItem($"{jobNumber}: {jobName}", null, tasks, tasks =>
                    {
                        using (new WaitCursor())
                        {
                            var kanbans = LoadKanbans(tasks, new Columns<Kanban>(x => x.ID, x => x.JobLink.ID));
                            foreach (var kanban in kanbans)
                                kanban.JobLink.ID = row.Get<Job, Guid>(x => x.ID);
                            new Client<Kanban>().Save(kanbans, "Updated Job Number");
                            control.Refresh(false);
                        }
                    });
                }
            }
        }

        #region Get/Save Settings

        private KanbanSettings? _settings;

        public KanbanSettings KanbanSettings
        {
            get
            {
                _settings ??= new UserConfiguration<KanbanSettings>().Load();
                return _settings;
            }
        }

        public void SaveSettings()
        {
            if(_settings != null)
                new UserConfiguration<KanbanSettings>().Save(_settings);
        }

        #endregion

        #region IPanel Stuff

        public event DataModelUpdateEvent? OnUpdateDataModel;

        public bool IsReady { get; set; }

        public void CreateToolbarButtons(IPanelHost host)
        {
            host.CreatePanelAction(
                new PanelAction
                {
                    Caption = "New Task",
                    OnExecute = a => {
                        if(CreateKanban(k => { }) != null)
                        {
                            Refresh();
                        }
                    },
                    Image = PRSDesktop.Resources.add
                }
            );
        }

        public Dictionary<string, object[]> Selected()
        {
            return new Dictionary<string, object[]>();
        }

        public void Heartbeat(TimeSpan time)
        {
        }

        private readonly Dictionary<KanbanViewType, TabItem> _viewmap = new();

        private readonly List<ITaskControl> _initialized = new();

        private ITaskControl 
            GetCurrentPanel()
        {
            var result = (TaskPanels.SelectedContent as ITaskControl)!;
            if (result == null)
                result = (TaskPanels.Items[0] as DynamicTabItem)?.Content as ITaskControl;
            try
            {
                //if (result != null)
                if (!_initialized.Contains(result))
                {
                    result.Setup();
                    result.IsReady = true;
                    _initialized.Add(result);
                }
            }
            catch (Exception e)
            {
                Logger.Send(LogType.Error, "", $"Error in TaskPanel.GetCurrentPanel: {CoreUtils.FormatException(e)}");
            }

            return result;
        }

        public void Setup()
        {
            _settings = new UserConfiguration<KanbanSettings>().Load();


            TaskPanels.SelectedItem = _viewmap[_settings.ViewType];

            kanbanTypes = new Client<KanbanType>()
                .Query(new Filter<KanbanType>(x => x.Hidden).IsEqualTo(false), new Columns<KanbanType>(x => x.ID, x => x.Code, x => x.Description))
                .Rows.Select(x => x.ToObject<KanbanType>()).ToArray();
        }

        public void Shutdown()
        {
        }

        public void Refresh()
        {
            if (ParentID == Guid.Empty)
            {
                if (TaskPanels.SelectedItem == TasksPlannerTabItem)
                    TaskPanels.SelectedItem = _viewmap[KanbanViewType.Status];
                if (TasksPlannerTabItem.Visibility == Visibility.Visible)
                    TasksPlannerTabItem.Visibility = Visibility.Collapsed;
            }
            else
            {
                if (TasksPlannerTabItem.Visibility == Visibility.Collapsed)
                    TasksPlannerTabItem.Visibility = Visibility.Visible;
            }

            TasksPlannerTabItem.Visibility = ParentID != Guid.Empty ? Visibility.Visible : Visibility.Collapsed;

            GetCurrentPanel()?.Refresh(false);
        }

        public string SectionName => GetCurrentPanel().SectionName;

        public TaskPanelProperties Properties { get; set; }

        public DataModel DataModel(Selection selection)
        {
            return GetCurrentPanel().DataModel(selection);
            //return new AutoDataModel<Kanban>(new Filter<Kanban>(x => x.ID).IsEqualTo(Guid.Empty));
        }

        #endregion

        #region CRUD Functionality

        private TEntity? DoCreate<TEntity>(Action<TEntity> customise)
            where TEntity : Entity, IRemotable, IPersistent, new()
        {
            var result = new TEntity();
            customise?.Invoke(result);
            if (DoEdit(new[] { result }, null))
                return result;
            return null;
        }

        private readonly Dictionary<Type, IDynamicGrid> _grids = new();

        private readonly List<Tuple<Guid, Entity>> _entitycache = new();

        private DynamicDataGrid<TEntity> GetGrid<TEntity>() where TEntity : Entity, IRemotable, IPersistent, new()
        {
            if(!_grids.TryGetValue(typeof(TEntity), out var grid))
            {
                grid = (DynamicGridUtils.CreateDynamicGrid(typeof(DynamicDataGrid<>), typeof(TEntity)) as DynamicDataGrid<TEntity>)!;
                _grids[typeof(TEntity)] = grid;

                if (typeof(TEntity) == typeof(Kanban))
                {
                    CustomiseKanbanGrid((grid as DynamicDataGrid<Kanban>)!);
                }
            }

            return (grid as DynamicDataGrid<TEntity>)!;
        }

        private IEnumerable<TEntity> DoLoad<TEntity>(IEnumerable<TaskModel> models, Columns<TEntity> columns)
            where TEntity : Entity, IRemotable, IPersistent, new()
        {
            var result = new List<TEntity>();
            var load = new List<Guid>();
            foreach (var model in models)
            {
                var id = Guid.Parse(model.ID);
                var entity = _entitycache.FirstOrDefault(x => Equals(x.Item1, id) && x.Item2 is TEntity) as TEntity;
                if (entity is not null)
                    result.Add(entity);
                else
                    load.Add(id);
            }

            if (load.Any())
            {
                var entities = new Client<TEntity>()
                    .Query(new Filter<TEntity>(x => x.ID).InList(load.ToArray()), columns)
                    .Rows.Select(x => x.ToObject<TEntity>()).ToList();
                foreach (var entity in entities)
                    _entitycache.Add(new Tuple<Guid, Entity>(entity.ID, entity));
                result.AddRange(entities);
            }

            return result;
        }

        private IEnumerable<TEntity> DoLoad<TEntityKanban, TEntity, TLink>(IEnumerable<TaskModel> models, Columns<TEntity> columns)
            where TEntityKanban : EntityKanban<TEntity, TLink>, new()
            where TEntity : Entity, IRemotable, IPersistent, new()
            where TLink : IEntityLink<TEntity>, new()
        {
            var result = DoLoad(models, columns);
            if (!result.Any())
                foreach (var model in models)
                {
                    var id = Guid.Parse(model.ID);
                    result = new Client<TEntity>().Load(
                        new Filter<TEntity>(x => x.ID).InQuery(new Filter<TEntityKanban>(x => x.Kanban.ID).IsEqualTo(id),
                            x => x.Entity.ID));
                    foreach (var r in result)
                        _entitycache.Add(new Tuple<Guid, Entity>(id, r));
                }

            return result;
        }

        private void DoCache<TEntity>(Guid kanbanid, TEntity entity) where TEntity : Entity
        {
            if (!_entitycache.Any(x => Equals(x.Item1, kanbanid) && x.Item2 is TEntity && Equals(x.Item2.ID, entity.ID)))
                _entitycache.Add(new Tuple<Guid, Entity>(kanbanid, entity));
        }

        private bool DoEdit<TEntity>(IEnumerable<TEntity> entities, Action<TEntity>? action = null)
            where TEntity : Entity, IRemotable, IPersistent, new()
        {
            if (entities == null || !entities.Any())
                return false;

            foreach (var entity in entities)
                action?.Invoke(entity);

            return GetGrid<TEntity>().EditItems(entities.ToArray());
        }

        private void DoLink<TEntityKanban, TEntity, TLink>(TaskModel model, Guid entityid)
            where TEntityKanban : EntityKanban<TEntity, TLink>, new()
            where TEntity : Entity, IRemotable, IPersistent, new()
            where TLink : IEntityLink<TEntity>, new()
        {
            var linktask = Task.Run(() =>
            {
                var link = new TEntityKanban();
                link.Kanban.ID = Guid.Parse(model.ID);
                link.Entity.ID = entityid;
                new Client<TEntityKanban>().Save(link, "");
            });
            var kanbantask = Task.Run(() =>
            {
                var kanban = LoadKanbans(new[] { model }, new Columns<Kanban>(x => x.ID, x => x.Locked)).FirstOrDefault();
                if (kanban is not null)
                {
                    kanban.Locked = true;
                    new Client<Kanban>().Save(kanban, "Locked because of linked " + typeof(TEntity).EntityName().Split('.').Last());
                }
            });
            Task.WaitAll(linktask, kanbantask);
        }

        private static void DoDelete<TEntity>(IList<TEntity> entities, string auditnote)
            where TEntity : Entity, IRemotable, IPersistent, new()
        {
            new Client<TEntity>().Delete(entities, auditnote);
        }

        public Kanban? CreateKanban(Action<Kanban> customise)
        {
            var result = DoCreate<Kanban>(
                kanban =>
                {
                    kanban.Title = "New Task";
                    kanban.Description = "";
                    kanban.Category = "Open";
                    kanban.DueDate = DateTime.Today;
                    kanban.Private = false;
                    kanban.JobLink.ID = ParentID;
                    kanban.EmployeeLink.ID = MyID;
                    kanban.ManagerLink.ID = MyID;
                    customise?.Invoke(kanban);
                });
            if (result != null)
                DoCache(result.ID, result);
            return result;
        }

        public IEnumerable<Kanban> LoadKanbans(IEnumerable<TaskModel> models, Columns<Kanban> columns)
        {
            columns.Add(x => x.ID);
            columns.Add(x => x.Number);
            columns.Add(x => x.Title);
            columns.Add(x => x.Notes);
            columns.Add(x => x.Summary);
            columns.Add(x => x.Completed);
            columns.Add(x => x.DueDate);
            columns.Add(x => x.ManagerLink.ID);
            columns.Add(x => x.EmployeeLink.ID);
            return DoLoad(models, columns);
        }

        public void OnValidateKanban(object sender, Kanban[] items, List<string> errors)
        {
            if (Properties.RequireTaskTypes && items.Any(x => x.Type.ID == Guid.Empty))
            {
                errors.Add("[Task Type] may not be blank!");
            }
        }

        public void CustomiseKanbanGrid(DynamicDataGrid<Kanban> grid)
        {
            grid.OnValidate += OnValidateKanban;
        }

        public bool EditKanbans(IEnumerable<TaskModel> models, Action<Kanban>? customise = null)
        {
            var entities = LoadKanbans(models, GetGrid<Kanban>().LoadEditorColumns());
            return DoEdit(entities, customise);
        }

        public void DeleteKanbans(IEnumerable<TaskModel> models, string auditnote)
        {
            var kanbans = models.Select(x => new Kanban { ID = Guid.Parse(x.ID) }).ToList();
            DoDelete(kanbans, auditnote);
        }

        public Requisition? CreateRequisition(TaskModel model, Action<Requisition>? customise)
        {
            var result = DoCreate<Requisition>(
                requi =>
                {
                    requi.JobLink.ID = ParentID;
                    customise?.Invoke(requi);
                });
            if (result != null)
            {
                var id = Guid.Parse(model.ID);
                DoCache(id, result);
                DoLink<RequisitionKanban, Requisition, RequisitionLink>(model, result.ID);
            }

            return result;
        }


        public bool EditRequisitions(IEnumerable<TaskModel> models, Action<Requisition>? customise = null)
        {
            var requis = DoLoad<RequisitionKanban, Requisition, RequisitionLink>(models, GetGrid<Requisition>().LoadEditorColumns());
            if (requis.Any())
                return DoEdit(requis, customise);
            return false;
        }

        public Setout? CreateSetout(TaskModel model, Action<Setout> customise)
        {
            var result = DoCreate<Setout>(
                setout =>
                {
                    setout.JobLink.ID = ParentID;
                    customise?.Invoke(setout);
                });
            if (result != null)
            {
                var id = Guid.Parse(model.ID);
                DoCache(id, result);
                //DoLink<SetoutKanban, Setout, SetoutLink>(model, result.ID);
            }

            return result;
        }

        public bool EditSetouts(IEnumerable<TaskModel> models, Action<Setout>? customise = null)
        {
            var setouts = DoLoad<SetoutKanban, Setout, SetoutLink>(models, GetGrid<Setout>().LoadEditorColumns());
            if (setouts.Any())
                return DoEdit(setouts, customise);
            return false;
        }

        public Delivery? CreateDelivery(TaskModel model, Action<Delivery> customise)
        {
            var result = DoCreate<Delivery>(
                delivery =>
                {
                    delivery.Job.ID = ParentID;
                    customise?.Invoke(delivery);
                });
            if (result != null)
            {
                var id = Guid.Parse(model.ID);
                DoCache(id, result);
                DoLink<DeliveryKanban, Delivery, DeliveryLink>(model, result.ID);
            }

            return result;
        }

        public bool EditDeliveries(IEnumerable<TaskModel> models, Action<Delivery>? customise = null)
        {
            var deliveries = DoLoad<DeliveryKanban, Delivery, DeliveryLink>(models, GetGrid<Delivery>().LoadEditorColumns());
            if (deliveries.Any())
                return DoEdit(deliveries, customise);
            return false;
        }


        public PurchaseOrder? CreateOrder(TaskModel model, Action<PurchaseOrder> customise)
        {
            var result = DoCreate<PurchaseOrder>(
                order => { customise?.Invoke(order); });
            if (result != null)
            {
                var id = Guid.Parse(model.ID);
                DoCache(id, result);
                DoLink<PurchaseOrderKanban, PurchaseOrder, PurchaseOrderLink>(model, result.ID);
            }

            return result;
        }

        public bool EditPurchaseOrders(IEnumerable<TaskModel> models, Action<PurchaseOrder>? customise = null)
        {
            var orders = DoLoad<PurchaseOrderKanban, PurchaseOrder, PurchaseOrderLink>(models, GetGrid<PurchaseOrder>().LoadEditorColumns());
            if (orders.Any())
                return DoEdit(orders, customise);
            return false;
        }

        #endregion

        #region EntityReferences

        private static void AddQuery<TEntityKanban, TEntity, TLink>(MultiQuery query, Guid[] taskids)
            where TEntityKanban : EntityKanban<TEntity, TLink>, new()
            where TEntity : Entity
            where TLink : IEntityLink<TEntity>, new()
        {
            query.Add(
                new Filter<TEntityKanban>(x => x.Kanban.ID).InList(taskids),
                new Columns<TEntityKanban>(x => x.Entity.ID).Add(x => x.Kanban.ID)
            );
        }

        private static Guid[] ExtractIDs<TEntityKanban, TEntity, TLink>(MultiQuery query)
            where TEntityKanban : EntityKanban<TEntity, TLink>, new()
            where TEntity : Entity
            where TLink : IEntityLink<TEntity>, new()
        {
            var lookup = query.Get<TEntityKanban>().ToLookup<TEntityKanban, Guid, Guid>(x => x.Kanban.ID, x => x.Entity.ID);
            return query.Get<TEntityKanban>().ExtractValues<TEntityKanban, Guid>(x => x.Entity.ID).ToArray();
        }

        public KanbanReferences[] GetReferences(IEnumerable<TaskModel> models)
        {
            var result = new List<KanbanReferences>();

            var ids = models.Select(x => Guid.Parse(x.ID)).ToArray();

            var query = new MultiQuery();

            AddQuery<RequisitionKanban, Requisition, RequisitionLink>(query, ids);
            AddQuery<SetoutKanban, Setout, SetoutLink>(query, ids);
            AddQuery<DeliveryKanban, Delivery, DeliveryLink>(query, ids);
            AddQuery<PurchaseOrderKanban, PurchaseOrder, PurchaseOrderLink>(query, ids);

            query.Query();

            var requis = query.Get<RequisitionKanban>().ToLookup<RequisitionKanban, Guid, Guid>(x => x.Kanban.ID, x => x.Entity.ID);
            var setouts = query.Get<SetoutKanban>().ToLookup<SetoutKanban, Guid, Guid>(x => x.Kanban.ID, x => x.Entity.ID);
            var deliveries = query.Get<DeliveryKanban>().ToLookup<DeliveryKanban, Guid, Guid>(x => x.Kanban.ID, x => x.Entity.ID);
            var orders = query.Get<PurchaseOrderKanban>().ToLookup<PurchaseOrderKanban, Guid, Guid>(x => x.Kanban.ID, x => x.Entity.ID);

            foreach (var id in ids)
            {
                var references = new KanbanReferences
                {
                    Kanban = id,
                    Requisitions = requis.Contains(id) ? requis[id].ToArray() : Array.Empty<Guid>(),
                    Setouts = setouts.Contains(id) ? setouts[id].ToArray() : Array.Empty<Guid>(),
                    Deliveries = deliveries.Contains(id) ? deliveries[id].ToArray() : Array.Empty<Guid>(),
                    Orders = orders.Contains(id) ? orders[id].ToArray() : Array.Empty<Guid>()
                };
                result.Add(references);
            }

            return result.ToArray();
        }

        public bool EditReferences(IEnumerable<TaskModel> models)
        {
            var result = false;
            var refs = GetReferences(models).First();
            if (refs.ReferenceType() == typeof(Requisition))
                result = EditRequisitions(
                    models,
                    requi =>
                    {
                        requi.Notes = Utility.ProcessNotes(requi.Notes, requi.Request);
                        requi.Request = "";
                    }
                );
            else if (refs.ReferenceType() == typeof(Setout))
                result = EditSetouts(models);
            else if (refs.ReferenceType() == typeof(Delivery))
                result = EditDeliveries(models);
            else if (refs.ReferenceType() == typeof(PurchaseOrder))
                result = EditPurchaseOrders(models);
            else
                result = EditKanbans(models);
            return result;
        }

        #endregion
    }
}