#nullable enable

using System.Collections.ObjectModel;

namespace UICatalog.Scenarios;

[ScenarioMetadata (
                      "Collection Navigator",
                      "Demonstrates keyboard navigation in ListView & TreeView (CollectionNavigator)."
                  )]
[ScenarioCategory ("Controls")]
[ScenarioCategory ("ListView")]
[ScenarioCategory ("TreeView")]
[ScenarioCategory ("Text and Formatting")]
[ScenarioCategory ("Mouse and Keyboard")]
public class CollectionNavigatorTester : Scenario
{
    private ObservableCollection<string> _items = new (
                                                       [
                                                           "a",
                                                           "b",
                                                           "bb",
                                                           "c",
                                                           "ccc",
                                                           "ccc",
                                                           "cccc",
                                                           "ddd",
                                                           "dddd",
                                                           "dddd",
                                                           "ddddd",
                                                           "dddddd",
                                                           "ddddddd",
                                                           "this",
                                                           "this is a test",
                                                           "this was a test",
                                                           "this and",
                                                           "that and that",
                                                           "the",
                                                           "think",
                                                           "thunk",
                                                           "thunks",
                                                           "zip",
                                                           "zap",
                                                           "zoo",
                                                           "@jack",
                                                           "@sign",
                                                           "@at",
                                                           "@ateme",
                                                           "n@",
                                                           "n@brown",
                                                           ".net",
                                                           "$100.00",
                                                           "$101.00",
                                                           "$101.10",
                                                           "$101.11",
                                                           "$200.00",
                                                           "$210.99",
                                                           "$$",
                                                           "apricot",
                                                           "arm",
                                                           "丗丙业丞",
                                                           "丗丙丛",
                                                           "text",
                                                           "egg",
                                                           "candle",
                                                           " <- space",
                                                           "\t<- tab",
                                                           "\n<- newline",
                                                           "\r<- formfeed",
                                                           "q",
                                                           "quit",
                                                           "quitter"
                                                       ]
                                                      );

    private Window? _top;
    private ListView? _listView;
    private TreeView? _treeView;
    private CheckBox? _allowMarkingCheckBox;
    private CheckBox? _allowMultiSelectionCheckBox;

    public override void Main ()
    {
        Application.Init ();

        Window top = new ()
        {
            SchemeName = "Base"
        };
        _top = top;

        // MenuBar
        MenuBar menu = new ();

        _allowMarkingCheckBox = new ()
        {
            Title = "Allow _Marking"
        };

        _allowMarkingCheckBox.CheckedStateChanged += (s, e) =>
                                                     {
                                                         if (_listView is { })
                                                         {
                                                             _listView.AllowsMarking = _allowMarkingCheckBox.CheckedState == CheckState.Checked;
                                                         }

                                                         if (_allowMultiSelectionCheckBox is { })
                                                         {
                                                             _allowMultiSelectionCheckBox.Enabled = _allowMarkingCheckBox.CheckedState == CheckState.Checked;
                                                         }
                                                     };

        _allowMultiSelectionCheckBox = new ()
        {
            Title = "Allow Multi _Selection",
            Enabled = false
        };

        _allowMultiSelectionCheckBox.CheckedStateChanged += (s, e) =>
                                                            {
                                                                if (_listView is { })
                                                                {
                                                                    _listView.AllowsMultipleSelection =
                                                                        _allowMultiSelectionCheckBox.CheckedState == CheckState.Checked;
                                                                }
                                                            };

        menu.Add (
                  new MenuBarItem (
                                   "_Configure",
                                   [
                                       new MenuItem
                                       {
                                           CommandView = _allowMarkingCheckBox
                                       },
                                       new MenuItem
                                       {
                                           CommandView = _allowMultiSelectionCheckBox
                                       },
                                       new MenuItem
                                       {
                                           Title = "_Quit",
                                           Key = Application.QuitKey,
                                           Action = Quit
                                       }
                                   ]
                                  )
                 );

        menu.Add (
                  new MenuBarItem (
                                   "_Quit",
                                   [
                                       new MenuItem
                                       {
                                           Title = "_Quit",
                                           Key = Application.QuitKey,
                                           Action = Quit
                                       }
                                   ]
                                  )
                 );

        top.Add (menu);

        _items = new (_items.OrderBy (i => i, StringComparer.OrdinalIgnoreCase));

        CreateListView ();

        Line vsep = new ()
        {
            Orientation = Orientation.Vertical,
            X = Pos.Right (_listView!),
            Y = 1,
            Height = Dim.Fill ()
        };
        top.Add (vsep);
        CreateTreeView ();

        Application.Run (top);
        top.Dispose ();
        Application.Shutdown ();
    }

    private void CreateListView ()
    {
        if (_top is null)
        {
            return;
        }

        Label label = new ()
        {
            Text = "ListView",
            TextAlignment = Alignment.Center,
            X = 0,
            Y = 1, // for menu
            Width = Dim.Percent (50),
            Height = 1
        };
        _top.Add (label);

        _listView = new ()
        {
            X = 0,
            Y = Pos.Bottom (label),
            Width = Dim.Percent (50) - 1,
            Height = Dim.Fill (),
            AllowsMarking = false,
            AllowsMultipleSelection = false
        };
        _top.Add (_listView);

        _listView.SetSource (_items);

        _listView.KeystrokeNavigator.SearchStringChanged += (s, e) => { label.Text = $"ListView: {e.SearchString}"; };
    }

    private void CreateTreeView ()
    {
        if (_top is null || _listView is null)
        {
            return;
        }

        Label label = new ()
        {
            Text = "TreeView",
            TextAlignment = Alignment.Center,
            X = Pos.Right (_listView) + 2,
            Y = 1, // for menu
            Width = Dim.Percent (50),
            Height = 1
        };
        _top.Add (label);

        _treeView = new ()
        {
            X = Pos.Right (_listView) + 1,
            Y = Pos.Bottom (label),
            Width = Dim.Fill (),
            Height = Dim.Fill ()
        };
        _treeView.Style.HighlightModelTextOnly = true;
        _top.Add (_treeView);

        TreeNode root = new ("IsLetterOrDigit examples");

        root.Children = _items.Where (i => char.IsLetterOrDigit (i [0]))
                              .Select (i => new TreeNode (i))
                              .Cast<ITreeNode> ()
                              .ToList ();
        _treeView.AddObject (root);
        root = new ("Non-IsLetterOrDigit examples");

        root.Children = _items.Where (i => !char.IsLetterOrDigit (i [0]))
                              .Select (i => new TreeNode (i))
                              .Cast<ITreeNode> ()
                              .ToList ();
        _treeView.AddObject (root);
        _treeView.ExpandAll ();
        _treeView.GoToFirst ();

        _treeView.KeystrokeNavigator.SearchStringChanged += (s, e) => { label.Text = $"TreeView: {e.SearchString}"; };
    }

    private void Quit () { Application.RequestStop (); }
}