using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Interop;
using System.Windows.Markup;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using Tango.Core.Components;

namespace Tango.PPC.Common.Controls
{
    /// <summary>
    /// Represents an asynchronous UI element capable of displaying it's content on a thread different from the UI thread.
    /// This is possible by XML serialization of the visual content and extracting it to a new window which will be created on a new thread.
    /// The window will then be synchronized to the original control position and size.
    /// </summary>
    /// <remarks>
    /// This new window will override all elements of the main window so use with caution!
    /// </remarks>
    /// <seealso cref="System.Windows.Controls.ContentControl" />
    public partial class AsyncAdornerControl : ContentControl
    {
        private bool _loaded;
        private Window _window;

        /// <summary>
        /// Initializes a new instance of the <see cref="AsyncAdornerControl"/> class.
        /// </summary>
        public AsyncAdornerControl()
        {
            Loaded += AsyncAdornerControl_Loaded;
            IsVisibleChanged += AsyncAdornerControl_IsVisibleChanged;
        }

        /// <summary>
        /// Handles the IsVisibleChanged event of the AsyncAdornerControl control.
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="DependencyPropertyChangedEventArgs"/> instance containing the event data.</param>
        private void AsyncAdornerControl_IsVisibleChanged(object sender, DependencyPropertyChangedEventArgs e)
        {
            if (Visibility == Visibility.Visible)
            {
                ShowWindow();
            }
            else
            {
                HideWindow();
            }
        }

        /// <summary>
        /// Raises the <see cref="E:System.Windows.FrameworkElement.SizeChanged" /> event, using the specified information as part of the eventual event data.
        /// </summary>
        /// <param name="sizeInfo">Details of the old and new size involved in the change.</param>
        protected override void OnRenderSizeChanged(SizeChangedInfo sizeInfo)
        {
            base.OnRenderSizeChanged(sizeInfo);
            SyncBounds();
        }

        /// <summary>
        /// Handles the Loaded event of the AsyncAdornerControl control.
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="RoutedEventArgs"/> instance containing the event data.</param>
        private void AsyncAdornerControl_Loaded(object sender, RoutedEventArgs e)
        {
            if (!this.IsInDesignMode())
            {
                var startTime = Process.GetCurrentProcess().StartTime;

                if (_loaded) return;

                _loaded = true;

                var handle = new WindowInteropHelper(System.Windows.Application.Current.MainWindow).Handle;

                System.Windows.Application.Current.MainWindow.LocationChanged += MainWindow_LocationChanged;

                Visibility v = Visibility;

                var xaml = FrameworkElementSerializer.Serialize(Content as FrameworkElement);
                object dc = this.DataContext;
                Content = null;

                var main_dispatcher = System.Windows.Application.Current.Dispatcher;

                System.Windows.Application.Current.MainWindow.RegisterForLoadedOrNow((_,__) => 
                {

                    Thread thread = new Thread(() =>
                    {
                        main_dispatcher.ShutdownFinished += (x, y) =>
                        {
                            if (_window != null)
                            {
                                _window.Invoke(() =>
                                {
                                    _window.Close();
                                });
                            }
                        };

                        _window = new Window();
                        _window.WindowStyle = WindowStyle.None;
                        _window.ResizeMode = ResizeMode.NoResize;
                        _window.ShowInTaskbar = false;
                        _window.AllowsTransparency = true;
                        _window.Background = Brushes.Transparent;
                        _window.WindowStartupLocation = WindowStartupLocation.Manual;
                        SyncBounds();

                        if (v != Visibility.Visible)
                        {
                            _window.Opacity = 0;
                        }

                        new WindowInteropHelper(_window).Owner = handle;

                        _window.ShowActivated = false;

                        var cloned = FrameworkElementSerializer.Deserialize(xaml);
                        cloned.DataContext = dc;

                        _window.Content = cloned;

                        _window.Show();

                        SyncBounds();

                        System.Windows.Threading.Dispatcher.Run();
                    });

                    thread.SetApartmentState(ApartmentState.STA);
                    thread.IsBackground = true;
                    thread.Start();

                });
            }
        }

        /// <summary>
        /// Handles the LocationChanged event of the MainWindow control.
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="EventArgs"/> instance containing the event data.</param>
        private void MainWindow_LocationChanged(object sender, EventArgs e)
        {
            SyncBounds();
        }

        /// <summary>
        /// Synchronizes the bounds of the window with the bounds of the original control.
        /// </summary>
        public void SyncBounds()
        {
            if (_window != null)
            {
                this.BeginInvoke(() =>
                {
                    Point location = PointToScreen(new Point(0, 0));
                    Size size = new Size(ActualWidth, ActualHeight);

                    _window.BeginInvoke(() =>
                    {
                        _window.Top = location.Y;
                        _window.Left = location.X;
                        _window.Width = size.Width;
                        _window.Height = size.Height;
                    });
                });
            }
        }

        /// <summary>
        /// Hides the element window.
        /// </summary>
        private void HideWindow()
        {
            if (_window != null)
            {
                _window.BeginInvoke(() =>
                {
                    _window.Hide();
                });
            }
        }

        /// <summary>
        /// Shows the element window.
        /// </summary>
        private void ShowWindow()
        {
            if (_window != null)
            {
                _window.BeginInvoke(() =>
                {
                    _window.Opacity = 1;
                    _window.Show();
                });
            }
        }
    }
}