using System;
using System.Reflection;

namespace Terminal.Gui;

/// <summary>
///     A status bar is a <see cref="View"/> that snaps to the bottom of a <see cref="Toplevel"/> displaying set of
///     <see cref="Shortcut"/>s. The <see cref="StatusBar"/> should be context sensitive. This means, if the main menu
///     and an open text editor are visible, the items probably shown will be ~F1~ Help ~F2~ Save ~F3~ Load. While a dialog
///     to ask a file to load is executed, the remaining commands will probably be ~F1~ Help. So for each context must be a
///     new instance of a status bar.
/// </summary>
public class StatusBar : Bar, IDesignable
{
    /// <inheritdoc/>
    public StatusBar () : this ([]) { }

    /// <inheritdoc/>
    public StatusBar (IEnumerable<Shortcut> shortcuts) : base (shortcuts)
    {
        TabStop = TabBehavior.NoStop;
        Orientation = Orientation.Horizontal;
        Y = Pos.AnchorEnd ();
        Width = Dim.Fill ();
        Height = Dim.Auto (DimAutoStyle.Content, 1);
        BorderStyle = LineStyle.Dashed;
        ColorScheme = Colors.ColorSchemes ["Menu"];

        SubviewLayout += StatusBar_LayoutStarted;
    }

    // StatusBar arranges the items horizontally.
    // The first item has no left border, the last item has no right border.
    // The Shortcuts are configured with the command, help, and key views aligned in reverse order (EndToStart).
    private void StatusBar_LayoutStarted (object sender, LayoutEventArgs e)
    {
        for (int index = 0; index < Subviews.Count; index++)
        {
            View barItem = Subviews [index];

            barItem.BorderStyle = BorderStyle;

            if (index == Subviews.Count - 1)
            {
                barItem.Border.Thickness = new Thickness (0, 0, 0, 0);
            }
            else
            {
                barItem.Border.Thickness = new Thickness (0, 0, 1, 0);
            }

            if (barItem is Shortcut shortcut)
            {
                shortcut.Orientation = Orientation.Horizontal;
            }
        }
    }

    /// <inheritdoc/>
    public override View Add (View view)
    {
        // Call base first, because otherwise it resets CanFocus to true
        base.Add (view);

        view.CanFocus = false;

        if (view is Shortcut shortcut)
        {
            // TODO: not happy about using AlignmentModes for this. Too implied.
            // TODO: instead, add a property (a style enum?) to Shortcut to control this
            shortcut.AlignmentModes = AlignmentModes.EndToStart;
        }

        return view;
    }

    /// <inheritdoc />
    bool IDesignable.EnableForDesign ()
    {
        var shortcut = new Shortcut
        {
            Text = "Quit",
            Title = "Q_uit",
            Key = Key.Z.WithCtrl,
        };

        Add (shortcut);

        shortcut = new Shortcut
        {
            Text = "Help Text",
            Title = "Help",
            Key = Key.F1,
        };

        Add (shortcut);

        shortcut = new Shortcut
        {
            Title = "_Show/Hide",
            Key = Key.F10,
            CommandView = new CheckBox
            {
                CanFocus = false,
                Text = "_Show/Hide"
            },
        };

        Add (shortcut);

        var button1 = new Button
        {
            Text = "I'll Hide",
            // Visible = false
        };
        button1.Accepting += Button_Clicked;
        Add (button1);

        shortcut.Accepting += (s, e) =>
                           {
                               button1.Visible = !button1.Visible;
                               button1.Enabled = button1.Visible;
                               e.Cancel = false;
                           };

        Add (new Label
        {
            HotKeySpecifier = new Rune ('_'),
            Text = "Fo_cusLabel",
            CanFocus = true
        });

        var button2 = new Button
        {
            Text = "Or me!",
        };
        button2.Accepting += (s, e) => Application.RequestStop ();

        Add (button2);

        return true;

        void Button_Clicked (object sender, EventArgs e) { MessageBox.Query ("Hi", $"You clicked {sender}"); }
    }

}