using Windows.UI.ApplicationSettings;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
 
public partial class SettingsHelper
{
    private Popup m_Popup = new Popup();
    private readonly List<ICommandInfo> Commands = new List<ICommandInfo>();
    public SettingsHelper()
    {
        SettingsPane.GetForCurrentView().CommandsRequested += (s, e) =>
        {
            foreach (var item in Commands)
            {
                var _Command = new SettingsCommand(item.Key, item.Text,
                    c => { Show(item.Instance(), item.Width); });
                e.Request.ApplicationCommands.Add(_Command);
            }
        };
    }
 
    public void AddCommand<T>(string text, string key = null,
        PanelWidths width = PanelWidths.Small) where T : UserControl, new()
    {
        CommandInfo<T> cmd = 
            new CommandInfo<T>()
            {
                Key = key ?? text,
                Text = text,
                Width = (int)width
            };
 
        if(null == this.Commands.FirstOrDefault(c => c.Key.Equals(cmd.Key)))
            this.Commands.Add(cmd);
 
    }
 
    private Popup Show(UserControl control, double width)
    {
        if (control == null)
            throw new Exception("Control is not defined");
        if (double.IsNaN(width))
            throw new Exception("Width is not defined");
 
        // layout
        m_Popup.Width = width;
        m_Popup.HorizontalAlignment = Windows.UI.Xaml.HorizontalAlignment.Right;
        m_Popup.Height = Window.Current.Bounds.Height;
        m_Popup.SetValue(Canvas.LeftProperty, Window.Current.Bounds.Width - m_Popup.Width);
 
        // make content fit
        m_Popup.Child = control;
        control.VerticalAlignment = Windows.UI.Xaml.VerticalAlignment.Stretch;
        control.HorizontalAlignment = Windows.UI.Xaml.HorizontalAlignment.Stretch;
        control.Height = m_Popup.Height;
        control.Width = m_Popup.Width;
 
        // add pretty animation(s)
        m_Popup.ChildTransitions = new Windows.UI.Xaml.Media.Animation.TransitionCollection 
        { 
            new Windows.UI.Xaml.Media.Animation.EntranceThemeTransition 
            { 
                FromHorizontalOffset = 20d, 
                FromVerticalOffset = 0d 
            }
        };
 
        // setup
        m_Popup.IsLightDismissEnabled = true;
        m_Popup.IsOpen = true;
 
        // handle when it closes
        m_Popup.Closed -= popup_Closed;
        m_Popup.Closed += popup_Closed;
 
        // handle making it close
        Window.Current.Activated -= Current_Activated;
        Window.Current.Activated += Current_Activated;
 
        // return
        return m_Popup;
    }
 
    private void Current_Activated(object sender, Windows.UI.Core.WindowActivatedEventArgs e)
    {
        if (m_Popup == null)
            return;
        if (e.WindowActivationState == Windows.UI.Core.CoreWindowActivationState.Deactivated)
            m_Popup.IsOpen = false;
    }
 
    private void popup_Closed(object sender, object e)
    {
        Window.Current.Activated -= Current_Activated;
        if (m_Popup == null)
            return;
        m_Popup.IsOpen = false;
    }
 
    private interface ICommandInfo
    {
        string Key { get; set; }
        string Text { get; set; }
        double Width { get; set; }
        UserControl Instance();
    }
 
    private class CommandInfo<T> : ICommandInfo where T : UserControl, new()
    {
        public string Key { get; set; }
        public string Text { get; set; }
        public double Width { get; set; }
        public UserControl Instance() { return new T(); }
    }
 
    public enum PanelWidths : int
    {
        Small = 346,
        Large = 646
    }
}