using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using Tango.Core.Commands;
using Tango.FSE.Common;
using Tango.FSE.Common.Notifications;
using Tango.FSE.Common.Resolution;
using Tango.FSE.Common.WindowsManager;
using Tango.FSE.UI.Notifications;
using Tango.FSE.UI.Resolution;
using Tango.SharedUI.Effects;
using Tango.SharedUI.Helpers;

namespace Tango.FSE.UI.WindowsManager
{
    public class DefaultWindowsManager : IWindowsManager
    {
        private class DetachedElement
        {
            public ChildWindow Window { get; set; }
            public FrameworkElement Element { get; set; }
            public FrameworkElement Parent { get; set; }
            public FrameworkElement PlaceHolder { get; set; }
        }

        private List<DetachedElement> _detachedElements;
        private IResolutionService _resolutionService;
        private INotificationProvider _notificationProvider;

        public RelayCommand<FrameworkElement> DetachToWindowCommand { get; private set; }
        public RelayCommand<FrameworkElement> AttachFromWindowCommand { get; private set; }

        public DefaultWindowsManager(IResolutionService resolutionService, INotificationProvider notificationProvider)
        {
            _resolutionService = resolutionService;
            _notificationProvider = notificationProvider;
            _detachedElements = new List<DetachedElement>();
            DetachToWindowCommand = new RelayCommand<FrameworkElement>(DetachToWindow);
            AttachFromWindowCommand = new RelayCommand<FrameworkElement>(AttachFromWindow);
        }

        public void DetachToWindow(FrameworkElement element)
        {
            ChildWindow window = new ChildWindow();
            ChildWindowVM vm = new ChildWindowVM();
            vm.NotificationProvider = new DefaultNotificationProvider();
            window.DataContext = vm;
            window.Title = "Tango FSE";

            var title = WindowsManagerHelper.GetWindowTitle(element);

            if (title != null)
            {
                window.Title += " - " + title;
            }

            var oldDataContext = element.DataContext;

            DetachedElement detachedElement = new DetachedElement();
            detachedElement.Window = window;
            detachedElement.Element = element;
            detachedElement.Parent = element.Parent as FrameworkElement;

            if (WindowsManagerHelper.GetPreservePlaceHolder(element))
            {
                PlaceHolder holder = new PlaceHolder();
                detachedElement.PlaceHolder = holder;

                var snapshot = element.TakeSnapshot();
                Image img = new Image();
                img.Stretch = System.Windows.Media.Stretch.Uniform;
                img.Source = snapshot;
                img.Effect = new DisplaySettingEffect()
                {
                    SaturationLevel = 0
                };
                holder.InnerContent = img;

                //holder.Width = element.ActualWidth;
                //holder.Height = element.ActualHeight;
                UIHelper.RemoveChild(element.Parent, element);
                UIHelper.AddChild(detachedElement.Parent, holder);
            }
            else
            {
                UIHelper.RemoveChild(element.Parent, element);
            }

            window.contentBorder.Child = element;

            window.Owner = Application.Current.MainWindow;
            window.ShowInTaskbar = true;
            window.ShowActivated = true;

            _detachedElements.Add(detachedElement);

            window.Closed += (_, __) =>
            {
                AttachFromWindow(element);
            };

            if (oldDataContext is FSEViewModel)
            {
                if (!WindowsManagerHelper.GetDisableResolutionServiceInjection(element))
                {
                    (oldDataContext as FSEViewModel).ResolutionService = new DefaultResolutionService(window);
                }

                (oldDataContext as FSEViewModel).NotificationProvider = vm.NotificationProvider;
            }

            //Apply custom settings...
            double? startWidth = WindowsManagerHelper.GetStartWidth(element);
            double? startHeight = WindowsManagerHelper.GetStartHeight(element);
            double? minWidth = WindowsManagerHelper.GetMinWidth(element);
            double? minHeight = WindowsManagerHelper.GetMinHeight(element);
            bool lockAspectRatio = WindowsManagerHelper.GetLockAspectRatio(element);

            if (startWidth != null) window.Width = startWidth.Value;
            if (startHeight != null) window.Height = startHeight.Value;
            if (minWidth != null) window.MinWidth = minWidth.Value;
            if (minHeight != null) window.MinHeight = minHeight.Value;

            window.btnMaximize.IsEnabled = !WindowsManagerHelper.GetDisableMaximize(element);

            if (lockAspectRatio && startWidth != null && startHeight != null)
            {
                double ratio = startWidth.Value / startHeight.Value;

                window.Tag = false;

                window.SizeChanged += (_, e) =>
                {
                    if (!(bool)window.Tag)
                    {
                        //window.Tag = true;

                        //if (e.NewSize.Height != e.PreviousSize.Height)
                        //{
                        window.Width = window.Height * ratio;
                        //}
                        //else if (e.NewSize.Width != e.PreviousSize.Width)
                        //{
                        //    window.Height = window.Width / ratio;
                        //}

                        //window.Tag = false;
                    }
                };
            }

            window.Show();

            if (element.DataContext != oldDataContext)
            {
                element.DataContext = oldDataContext;
            }

            WindowsManagerHelper.SetIsDetached(element, true);
            element.RaiseEvent(new RoutedEventArgs(WindowsManagerHelper.DetachedEvent, element));
        }

        public void AttachFromWindow(FrameworkElement element)
        {
            var detachedElement = _detachedElements.SingleOrDefault(x => x.Element == element);

            if (detachedElement != null)
            {
                UIHelper.RemoveChild(detachedElement.Window.contentBorder, detachedElement.Element);
                detachedElement.Window.Close();

                if (element.DataContext is FSEViewModel)
                {
                    if (!WindowsManagerHelper.GetDisableResolutionServiceInjection(element))
                    {
                        (element.DataContext as FSEViewModel).ResolutionService = _resolutionService;
                    }

                    (element.DataContext as FSEViewModel).NotificationProvider = _notificationProvider;
                }

                if (detachedElement.PlaceHolder != null)
                {
                    UIHelper.RemoveChild(detachedElement.Parent, detachedElement.PlaceHolder);
                }

                UIHelper.AddChild(detachedElement.Parent, detachedElement.Element);
                _detachedElements.Remove(detachedElement);

                WindowsManagerHelper.SetIsDetached(element, false);
                element.RaiseEvent(new RoutedEventArgs(WindowsManagerHelper.AttachedEvent, element));
            }
        }

        public void CloseAll()
        {
            foreach (var detachedElement in _detachedElements.ToList())
            {
                AttachFromWindow(detachedElement.Element);
            }
        }
    }
}