using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Globalization;
using System.Linq;
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Input;
using System.Windows.Media.Imaging;
using AvalonDock.Layout;
using com.sun.org.apache.bcel.@internal.generic;
using Comal.Classes;
using InABox.Clients;
using InABox.Core;
using InABox.DynamicGrid;
using InABox.Wpf;
using InABox.WPF;
using Syncfusion.UI.Xaml.Kanban;
using Syncfusion.Windows.Tools.Controls;
using static com.sun.tools.javac.code.Symbol;

namespace PRSDesktop;

public class TasksByUserEmployeeHeader : INotifyPropertyChanged
{
    public Guid EmployeeID { get; set; }

    public string Name { get; set; }

    public BitmapImage Image { get; set; }

    public int NumTasks { get => Tasks.Count(); }

    public double NumHours { get => Tasks.Sum(x => x.EstimatedTime.TotalHours); }

    public IEnumerable<TaskModel> Tasks => Model.Categories
        .SelectMany(x => x.EmployeeCategoryDictionary.GetValueOrDefault(EmployeeID)?.Tasks ?? Enumerable.Empty<TaskModel>());

    private TasksByUserModel Model;

    public event PropertyChangedEventHandler? PropertyChanged;

    // Create the OnPropertyChanged method to raise the event
    // The calling member's name will be used as the parameter.
    protected void OnPropertyChanged([CallerMemberName] string? name = null)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(name));

        if (name.Equals(nameof(Tasks)))
        {
            OnPropertyChanged(nameof(NumTasks));
            OnPropertyChanged(nameof(NumHours));
        }
    }

    public TasksByUserEmployeeHeader(Guid employeeID, string name, BitmapImage image, TasksByUserModel model)
    {
        EmployeeID = employeeID;
        Name = name;
        Image = image;
        Model = model;
    }

    public void UpdateTasks()
    {
        OnPropertyChanged(nameof(Tasks));
    }
}

public class TasksByUserEmployeeCategory
{
    public Guid EmployeeID { get; set; }

    public KanbanStatus Status { get; set; }

    public SuspendableObservableCollection<TaskModel> Tasks { get; set; } = new();

    public TasksByUserEmployeeCategory(Guid employeeID, KanbanStatus status)
    {
        EmployeeID = employeeID;
        Status = status;
    }
}

public class TasksByUserCategory : INotifyPropertyChanged
{
    private bool _collapsed;
    public bool Collapsed
    {
        get => _collapsed;
        set
        {
            _collapsed = value;
            OnPropertyChanged();
        }
    }

    public KanbanStatus Status { get; set; }

    public IEnumerable<TasksByUserEmployeeCategory> EmployeeCategories => EmployeeCategoryDictionary.Values;

    public Dictionary<Guid, TasksByUserEmployeeCategory> EmployeeCategoryDictionary { get; set; } = new();

    public TasksByUserCategory(KanbanStatus status, bool collapsed)
    {
        Status = status;
        Collapsed = collapsed;
    }

    public event PropertyChangedEventHandler? PropertyChanged;

    // Create the OnPropertyChanged method to raise the event
    // The calling member's name will be used as the parameter.
    protected void OnPropertyChanged([CallerMemberName] string? name = null)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(name));
    }
}

public class TasksByUserModel
{
    public SuspendableObservableCollection<TasksByUserEmployeeHeader> SectionHeaders { get; set; } = new();

    public SuspendableObservableCollection<TasksByUserCategory> Categories { get; set; } = new();
}

public partial class TasksByUserControl : UserControl, INotifyPropertyChanged, ITaskControl
{
    private static readonly BitmapImage anonymous = PRSDesktop.Resources.anonymous.AsBitmapImage();

    public TasksByUserModel Model { get; set; } = new();

    private ILookup<Guid, Guid> TeamEmployees;

    private Dictionary<Guid, EmployeeModel> Employees;

    private bool bPopulating;

    private KanbanViewMode _mode;

    public KanbanViewMode Mode
    {
        get => _mode;
        set
        {
            _mode = value;
            OnPropertyChanged();
        }
    }

    public TasksByUserControl()
    {
        InitializeComponent();
    }

    #region INotifyPropertyChanged

    public event PropertyChangedEventHandler? PropertyChanged;

    // Create the OnPropertyChanged method to raise the event
    // The calling member's name will be used as the parameter.
    protected void OnPropertyChanged([CallerMemberName] string? name = null)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(name));
    }

    #endregion

    #region Setup

    private void LoadEmployees()
    {
        var empfilter = LookupFactory.DefineFilter<Employee>();

        var results = Client.QueryMultiple(
            new KeyedQueryDef<Employee>(
                LookupFactory.DefineFilter<Employee>(),
                new Columns<Employee>(x => x.ID)
                    .Add(x => x.Name)
                    .Add(x => x.Thumbnail.ID),
                new SortOrder<Employee>(x => x.Name)),
            new KeyedQueryDef<Team>(
                LookupFactory.DefineFilter<Team>(),
                new Columns<Team>(x => x.ID)
                    .Add(x => x.Name),
                new SortOrder<Team>(x => x.Name)),
            new KeyedQueryDef<EmployeeTeam>(
                LookupFactory.DefineFilter<EmployeeTeam>(),
                new Columns<EmployeeTeam>(x => x.EmployeeLink.ID)
                    .Add(x => x.TeamLink.ID)));

        TeamEmployees = results.Get<EmployeeTeam>().ToLookup<EmployeeTeam, Guid, Guid>(x => x.TeamLink.ID, x => x.EmployeeLink.ID);
        Employees = results.GetObjects<Employee>().ToDictionary(
            x => x.ID,
            x => new EmployeeModel(x.ID, x.Name, x.Thumbnail.ID, null));

        var teams = results.GetObjects<Team>().ToDictionary(x => x.ID, x => x.Name);
        SelectedTeams.ItemsSource = teams;
        foreach (var team in Host.KanbanSettings.UserSettings.SelectedTeams)
        {
            SelectedTeams.SelectedItems.Add(teams.FirstOrDefault(x => x.Key == team));
        }
    }

    private void PopulateEmployees()
    {
        bPopulating = true;
        try
        {
            var availableemployees = new List<Guid>();
            foreach (var team in SelectedTeams.SelectedItems.Select(v => (KeyValuePair<Guid, string>)v))
                availableemployees.AddRange(TeamEmployees[team.Key].Where(x => !availableemployees.Contains(x)));

            SelectedEmployees.ItemsSource = Employees.Where(x => availableemployees.Contains(x.Key));
            SelectedEmployees.SelectedItems.Clear();
            foreach (var employee in Host.KanbanSettings.UserSettings.SelectedEmployees.Where(availableemployees.Contains))
                SelectedEmployees.SelectedItems.Add(Employees.FirstOrDefault(x => Equals(x.Key, employee)));
        }
        catch (Exception e)
        {
        }

        bPopulating = false;
    }

    private void SetupToolbar()
    {
        IncludeCompleted.Visibility = Security.IsAllowed<CanHideTaskCompletedColumn>() ? Visibility.Visible : Visibility.Collapsed;
        IncludeCompleted.IsChecked = IncludeCompleted.Visibility == Visibility.Visible ? Host.KanbanSettings.UserSettings.IncludeCompleted : true;
        IncludeObserved.IsChecked = Host.KanbanSettings.UserSettings.IncludeObserved;
        IncludeManaged.IsChecked = Host.KanbanSettings.UserSettings.IncludeManaged;
        ViewType.SelectedIndex = Host.KanbanSettings.UserSettings.CompactView ? 1 : 0;
    }

    private void PopulateKanbanTypes()
    {
        TaskType.Items.Add("");
        foreach (var kanbanType in Host.KanbanTypes)
        {
            TaskType.Items.Add(kanbanType);
        }
    }

    public void Setup()
    {
        SetupToolbar();

        SplitPanel.AnchorWidth = Host.KanbanSettings.UserSettings.AnchorWidth;
        TeamsRow.Height = new GridLength(Host.KanbanSettings.UserSettings.TeamsHeight);

        LoadEmployees();
        PopulateEmployees();

        Mode = Host.KanbanSettings.UserSettings.CompactView ? KanbanViewMode.Compact : KanbanViewMode.Full;

        PopulateKanbanTypes();

        FilterButton.SetSettings(Host.KanbanSettings.Filters, false);
    }

    #endregion

    #region Filters 

    private void TaskPanelFilterButton_OnFilterRefresh()
    {
        Refresh();
    }

    private void FilterButton_OnFiltersSelected(DynamicGridSelectedFilterSettings filters)
    {
        Host.KanbanSettings.Filters = filters;
        Host.SaveSettings();
    }

    private void IncludeCompleted_Checked(object sender, RoutedEventArgs e)
    {
        if (!IsReady)
            return;
        SaveSettings();
        Refresh();
    }

    private void IncludeObserved_Checked(object sender, RoutedEventArgs e)
    {
        if (!IsReady)
            return;
        SaveSettings();
        Refresh();
    }

    private void IncludeManaged_Checked(object sender, RoutedEventArgs e)
    {
        if (!IsReady)
            return;
        SaveSettings();
        Refresh();
    }

    private void TaskType_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        if (!IsReady)
            return;
        FilterKanbans();
    }

    private void Search_KeyUp(object sender, KeyEventArgs e)
    {
        FilterKanbans();
    }

    #endregion

    #region Refresh


    private Filter<KanbanSubscriber> GetKanbanSubscriberFilter(Filter<KanbanSubscriber>? additional = null)
    {
        var filter = new Filter<KanbanSubscriber>(c => c.Kanban.Closed).IsEqualTo(DateTime.MinValue)
            .And(x => x.Kanban.Locked).IsEqualTo(false);

        var privateFilter = new Filter<KanbanSubscriber>(x => x.Kanban.Private).IsEqualTo(false);
        if (App.EmployeeID != Guid.Empty)
        {
            privateFilter = privateFilter.Or(x => x.Employee.ID).IsEqualTo(App.EmployeeID);
        }
        filter.And(privateFilter);

        if (Host.Master != null) 
                filter = filter.And(c => c.Kanban.JobLink.ID).IsEqualTo(Host.Master.ID);
        
        if (!Host.KanbanSettings.UserSettings.IncludeCompleted)
            filter = filter.And(new Filter<KanbanSubscriber>(x => x.Kanban.Completed).IsEqualTo(DateTime.MinValue));

        var emps = Employees.Where(x => Host.KanbanSettings.UserSettings.SelectedEmployees.Contains(x.Key));

        filter = filter.And(c => c.Employee.ID).InList(emps.Select(x => x.Key).ToArray());
        if (!Host.KanbanSettings.UserSettings.IncludeObserved)
        {
            if (Host.KanbanSettings.UserSettings.IncludeManaged)
                filter = filter.And(new Filter<KanbanSubscriber>(x => x.Manager).IsEqualTo(true).Or(x => x.Assignee).IsEqualTo(true));
            else
                filter = filter.And(x => x.Assignee).IsEqualTo(true);
        }
        if (additional is not null)
        {
            return additional.And(filter);
        }
        else
        {
            return filter;
        }
    }

    private void ReloadColumns()
    {
        Model.SectionHeaders.SupressNotification = true;
        Model.SectionHeaders.Clear();

        var emps = Host.KanbanSettings.UserSettings.SelectedEmployees.Where(x => Employees.ContainsKey(x)).OrderBy(x => Employees[x].Name).ToArray();

        foreach (var employeeID in emps)
        {
            if (Employees.TryGetValue(employeeID, out var employee))
            {
                Model.SectionHeaders.Add(new TasksByUserEmployeeHeader(employeeID, employee.Name, employee.Image ?? anonymous, Model));
            }
        }
        Model.SectionHeaders.SupressNotification = false;
        Model.Categories.SupressNotification = true;

        var oldCategories = Model.Categories.ToDictionary(x => x.Status);

        Model.Categories.Clear();

        foreach (var status in _statusOrder)
        {
            if (status == KanbanStatus.Complete && !Host.KanbanSettings.UserSettings.IncludeCompleted)
            {
                continue;
            }
            var newCategory = new TasksByUserCategory(status, oldCategories.GetValueOrDefault(status)?.Collapsed ?? false);
            foreach (var employeeID in emps)
            {
                if (Employees.TryGetValue(employeeID, out var employee))
                {
                    var cat = new TasksByUserEmployeeCategory(employeeID, status);
                    newCategory.EmployeeCategoryDictionary[employeeID] = cat;
                    var header = Model.SectionHeaders.First(x => x.EmployeeID == employeeID);
                    cat.Tasks.CollectionChanged += (s, e) =>
                    {
                        header.UpdateTasks();
                    };
                }
            }
            Model.Categories.Add(newCategory);
        }
        Model.Categories.SupressNotification = false;
    }

    private static readonly KanbanStatus[] _statusOrder = new[]
            {
                KanbanStatus.Open,
                KanbanStatus.InProgress,
                KanbanStatus.Waiting,
                KanbanStatus.Complete
            };

    private Columns<Kanban> GetKanbanColumns()
    {
        return new Columns<Kanban>(
            x => x.ID,
            x => x.DueDate,
            x => x.Completed,
            x => x.Description,
            x => x.Summary,
            x => x.Status,
            x => x.EmployeeLink.ID,
            x => x.EmployeeLink.Name,
            x => x.ManagerLink.ID,
            x => x.ManagerLink.Name,
            x => x.Notes,
            x => x.Title,
            x => x.JobLink.ID,
            x => x.JobLink.JobNumber,
            x => x.JobLink.Name,
            x => x.Type.ID,
            x => x.Type.Code,
            x => x.Number,
            x => x.Attachments,
            x => x.Locked,
            x => x.EstimatedTime);
    }

    private IEnumerable<KanbanSubscriber> LoadSubscribers(Filter<KanbanSubscriber>? filter = null)
    {
        filter = GetKanbanSubscriberFilter(filter);

        var kanbanFilter = new Filter<Kanban>(x => x.ID).InQuery(filter, x => x.Kanban.ID);
        var buttonFilter = FilterButton.GetFilter();
        if(buttonFilter is not null)
        {
            kanbanFilter.And(buttonFilter);
        }

        var results = Client.QueryMultiple(
            new KeyedQueryDef<KanbanSubscriber>(
                filter,
                new Columns<KanbanSubscriber>(x => x.ID, x => x.Employee.ID, x => x.Kanban.ID),
                new SortOrder<KanbanSubscriber>(x => x.Kanban.DueDate) { Direction = SortDirection.Ascending }),
            new KeyedQueryDef<Kanban>(
               kanbanFilter,
                GetKanbanColumns()));

        var kanbans = results.GetObjects<Kanban>().ToDictionary(x => x.ID);
        return results.GetObjects<KanbanSubscriber>().Select(x =>
        {
            if (kanbans.TryGetValue(x.Kanban.ID, out var kanban))
            {
                x.Kanban.Synchronise(kanban);
                return x;
            }
            else
            {
                return null;
            }
        }).NotNull();
    }

    public void Refresh()
    {
        using (new WaitCursor())
        {
            var models = CreateModels(LoadSubscribers()).ToList();

            ReloadColumns();

            AllTasks = models.OrderBy(x => x.DueDate).ToList();
            FilterKanbans();
        }
    }

    /// <summary>
    /// Take the full list of kanbans loaded from the database, and filter based on the search UI elements, filtering into the columns.
    /// </summary>
    private void FilterKanbans()
    {
        IEnumerable<TaskModel> filtered = AllTasks;
        if (TaskType.SelectedItem is KanbanType kanbanType)
        {
            filtered = filtered.Where(x => x.Type.ID == kanbanType.ID);
        }
        if (!string.IsNullOrWhiteSpace(Search.Text))
        {
            var searches = Search.Text.Split();
            filtered = filtered.Where(x => x.Search(searches));
        }

        var categoryMap = Model.Categories.ToDictionary(x => x.Status, x => x.EmployeeCategoryDictionary);
        foreach(var category in Model.Categories)
        {
            foreach(var empCat in category.EmployeeCategories)
            {
                empCat.Tasks.Clear();
            }
        }

        SelectedTasks.Clear();

        foreach (var task in filtered)
        {
            if(categoryMap.TryGetValue(task.Status, out var categoryDict))
            {
                if (categoryDict.TryGetValue(task.EmployeeCategory, out var employeeCategory))
                {
                    employeeCategory.Tasks.Add(task);
                    if (task.Checked)
                    {
                        SelectedTasks.Add(task);
                    }
                }
            }
        }
    }

    private IEnumerable<TaskModel> CreateModels(IEnumerable<KanbanSubscriber> subscribers)
    {
        foreach(var subscriber in subscribers)
        {
            var kanban = subscriber.Kanban;
            var model = new TaskModel
            {
                Title = kanban.Title,
                ID = kanban.ID,
                Description = kanban.Summary ?? "",
                EmployeeCategory = subscriber.Employee.ID,
                Status = kanban.Status,
                Attachments = kanban.Attachments > 0,
                DueDate = kanban.DueDate,
                CompletedDate = kanban.Completed,
                Locked = kanban.Locked,
                EstimatedTime = kanban.EstimatedTime,
                EmployeeID = kanban.EmployeeLink.ID,
                ManagerID = kanban.ManagerLink.ID,
                JobID = kanban.JobLink.ID,
                JobNumber = kanban.JobLink.JobNumber?.Trim() ?? "",
                JobName = kanban.JobLink.Name,
                Type = new KanbanType
                {
                    ID = kanban.Type.ID,
                    Code = kanban.Type.Code
                },
                Number = kanban.Number,
                Checked = SelectedTasks.Any(x => x.ID == kanban.ID)
            };

            var colour = subscriber.Employee.ID == kanban.EmployeeLink.ID
                ? TaskModel.KanbanColor(
                    kanban.DueDate,
                    kanban.Completed)
                : subscriber.Employee.ID == kanban.ManagerLink.ID
                    ? Color.Silver
                    : Color.Plum;
            if (kanban.Locked)
            {
                colour = colour.MixColors(0.5F, Color.White);
            }
            model.Color = System.Windows.Media.Color.FromArgb(colour.A, colour.R, colour.G, colour.B);

            var notes = new List<List<string>> { new() };
            var kanbanNotes = kanban.Notes;
            if (kanbanNotes != null)
            {
                foreach (var line in kanbanNotes)
                {
                    if (line == "===================================")
                    {
                        notes.Add(new());
                    }
                    else
                    {
                        notes.Last().Add(line);
                    }
                }
            }
            model.Notes = string.Join("\n===================================\n", notes.Reverse<List<string>>().Select(x => string.Join('\n', x)));

            SetTaskModelAssignedTo(model, kanban, subscriber.Employee.ID);

            yield return model;
        }
    }

    private static void SetTaskModelAssignedTo(TaskModel model, IKanban kanban, Guid subscriberID)
    {
        var employeeString = kanban.EmployeeLink.ID == subscriberID
            ? ""
            : kanban.EmployeeLink.ID == Guid.Empty
                ? " to (Unallocated)"
                : " to " + kanban.EmployeeLink.Name;

        var managerString = kanban.ManagerLink.ID == Guid.Empty || kanban.ManagerLink.ID == subscriberID
            ? ""
            : " by " + kanban.ManagerLink.Name;

        model.AssignedTo = !string.IsNullOrEmpty(employeeString) || !managerString.IsNullOrWhiteSpace()
            ? $"Assigned{employeeString}{managerString}"
            : "";
    }

    #endregion

    #region Kanban

    private readonly List<TaskModel> SelectedTasks = new();
    private List<TaskModel> AllTasks { get; set; } = new();

    private void DoEdit(TaskModel task)
    {
        var result = Host.EditReferences(new[] { task });
        if (result)
        {
            Refresh();
        }
    }

    private void EditTask_Executed(object sender, ExecutedRoutedEventArgs e)
    {
        if (e.Parameter is not TaskModel model) return;

        DoEdit(model);
    }

    private void OpenTaskMenu_Executed(object sender, ExecutedRoutedEventArgs e)
    {
        if (e.Parameter is not KanbanResources.OpenTaskMenuCommandArgs args) return;

        Host.PopulateMenu(this, args.Model, args.Menu);
    }

    private void SelectTask_Executed(object sender, ExecutedRoutedEventArgs e)
    {
        if (e.Parameter is not TaskModel model) return;

        if (!SelectedTasks.Remove(model))
        {
            SelectedTasks.Add(model);
        }
    }

    private void CommandBinding_CanExecute(object sender, CanExecuteRoutedEventArgs e)
    {
        e.CanExecute = true;
    }


    private void ItemsControl_DragOver(object sender, DragEventArgs e)
    {
        if (sender is not FrameworkElement element || element.Tag is not TasksByUserEmployeeCategory category) return;

        e.Effects = DragDropEffects.None;
        if (e.Data.GetDataPresent(typeof(TaskModel)))
        {
            var model = e.Data.GetData(typeof(TaskModel)) as TaskModel;
            if (model is not null
                && (model.Status != category.Status || model.EmployeeCategory != category.EmployeeID)
                && !SelectedTasks.Any(x => x.Locked)
                && SelectedTasks.Concat(CoreUtils.One(model)).Any(x => x.IsAssignee))
            {
                e.Effects = DragDropEffects.Move;
            }
        }
    }

    private void ItemsControl_Drop(object sender, DragEventArgs e)
    {
        if (sender is not FrameworkElement element || element.Tag is not TasksByUserEmployeeCategory category) return;

        if (e.Data.GetDataPresent(typeof(TaskModel)))
        {
            var models = SelectedModels(e.Data.GetData(typeof(TaskModel)) as TaskModel)
                .Where(x => (!x.Status.Equals(category.Status) || x.EmployeeID != category.EmployeeID) && x.IsAssignee)
                .ToList();
            if (!models.Any())
            {
                return;
            }
            var changingCategory = models.Any(x => !x.Status.Equals(category.Status));
            var completing = changingCategory && category.Status == KanbanStatus.Complete;
            var completed = DateTime.Now;

            if (completing)
            {
                if (!MessageWindow.ShowYesNo($"Are you sure you want to complete the selected tasks?", "Confirm Completion"))
                    return;
            }

            var kanbans = Host.LoadKanbans(models, new Columns<Kanban>(x => x.ID, x => x.EmployeeLink.ID, x => x.Private, x => x.Number, x => x.Status));
            var subscribers = new ClientKanbanSubscriberSet(kanbans.Select(x => x.ID));

            foreach(var kanban in kanbans)
            {
                if (!kanban.Private)
                {
                    kanban.EmployeeLink.ID = category.EmployeeID;
                    subscribers.EnsureAssignee(kanban.ID, kanban.EmployeeLink.ID);

                    kanban.Status = category.Status;
                    if (completing)
                    {
                        kanban.Completed = completed;
                    }
                }
                else
                {
                    MessageBox.Show($"Cannot change assignee for task {kanban.Number} because it is private.");
                    models.RemoveAll(x => x.ID == kanban.ID);
                }
            }

            Client.Save(kanbans.Where(x => x.IsChanged()), $"Task Employee Updated");
            subscribers.Save(true);

            var kanbanIDs = models.Select(x => x.ID).ToArray();
            AllTasks.RemoveAll(x => kanbanIDs.Contains(x.ID));

            AllTasks.AddRange(CreateModels(LoadSubscribers(new Filter<KanbanSubscriber>(x => x.Kanban.ID).InList(kanbanIDs))));
            AllTasks.Sort((x, y) => x.DueDate.CompareTo(y.DueDate));

            FilterKanbans();
        }
    }

    #endregion

    #region ITaskControl

    public ITaskHost Host { get; set; }

    public KanbanViewType KanbanViewType => KanbanViewType.User;

    public bool IsReady { get; set; }

    public string SectionName => "Tasks By User";

    public DataModel DataModel(Selection selection)
    {
        var ids = SelectedModels().Select(x => x.ID).ToArray();
        return new AutoDataModel<Kanban>(new Filter<Kanban>(x => x.ID).InList(ids));
    }

    public IEnumerable<TaskModel> SelectedModels(TaskModel? sender = null)
    {
        if (sender is null)
        {
            return SelectedTasks;
        }
        else
        {
            var result = SelectedTasks.ToList();
            if (!result.Contains(sender))
            {
                result.Add(sender);
            }
            return result;
        }
    }

    #endregion

    #region Settings

    private void SaveSettings()
    {
        Host.KanbanSettings.UserSettings.AnchorWidth = SplitPanel.AnchorWidth;

        Host.KanbanSettings.UserSettings.TeamsHeight = SelectedTeams.ActualHeight;

        var teams = SelectedTeams.SelectedItems.Select(x => ((KeyValuePair<Guid, string>)x).Key);
        Host.KanbanSettings.UserSettings.SelectedTeams = teams.ToArray();

        var emps = SelectedEmployees.SelectedItems.Select(x => ((KeyValuePair<Guid, EmployeeModel>)x).Key);
        emps = emps.Where(e => TeamEmployees.Any(t => t.Contains(e)));
        Host.KanbanSettings.UserSettings.SelectedEmployees = emps.ToArray();

        Host.KanbanSettings.UserSettings.IncludeCompleted = IncludeCompleted.IsChecked == true;
        Host.KanbanSettings.UserSettings.IncludeObserved = IncludeObserved.IsChecked == true;
        Host.KanbanSettings.UserSettings.IncludeManaged = IncludeManaged.IsChecked == true;

        Host.SaveSettings();
    }

    private void SplitPanel_OnChanged(object sender, DynamicSplitPanelSettings e)
    {
        if (!IsReady || Equals(Host.KanbanSettings.UserSettings.AnchorWidth, e.AnchorWidth))
            return;
        SaveSettings();
    }

    private void SelectedTeams_ItemChecked(object sender, ItemCheckedEventArgs e)
    {
        if (!IsReady)
            return;
        PopulateEmployees();
        SaveSettings();
        Refresh();
    }

    private void SelectedTeams_SizeChanged(object sender, SizeChangedEventArgs e)
    {
        if (!IsReady || Equals(Host.KanbanSettings.UserSettings.TeamsHeight, SelectedTeams.ActualHeight))
            return;
        SaveSettings();
    }

    private void SelectedEmployees_ItemChecked(object sender, ItemCheckedEventArgs e)
    {
        if (!IsReady || bPopulating || sender != SelectedEmployees)
            return;
        SaveSettings();
        Refresh();
    }

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

        Mode = ViewType.SelectedIndex switch
        {
            0 => KanbanViewMode.Full,
            1 => KanbanViewMode.Compact,
            _ => KanbanViewMode.Full
        };

        if (IsReady)
        {
            Host.KanbanSettings.UserSettings.CompactView = Mode == KanbanViewMode.Compact;
            Host.SaveSettings();
        }
    }

    #endregion

    private void Export_Click(object sender, RoutedEventArgs e)
    {
        var form = new DynamicExportForm(typeof(Kanban), GetKanbanColumns().ColumnNames());
        if (form.ShowDialog() != true)
            return;
        var export = Client.Query(
            new Filter<Kanban>(x => x.ID).InQuery(GetKanbanSubscriberFilter(), x => x.Kanban.ID),
            new Columns<Kanban>(form.Fields),
            LookupFactory.DefineSort<Kanban>()
        );

        var employee = "Tasks for " + string.Join(',', Employees.Where(x => Host.KanbanSettings.UserSettings.SelectedEmployees.Contains(x.Key)).Select(x => x.Value.Name));

        ExcelExporter.DoExport<Kanban>(
            export,
            string.Format(
                "{0} ({1:dd-MMM-yy})",
                employee,
                DateTime.Today
            )
        );
    }

    private void FoldButton_Click(object sender, RoutedEventArgs e)
    {
        if (sender is not FrameworkElement element || element.Tag is not TasksByUserCategory category) return;

        category.Collapsed = !category.Collapsed;
    }
}