using Lattice.Core.DragDrop.Services;
using Lattice.Themes;
using Lattice.UI.DragDrop.WinUI.Factories;
using Lattice.UI.DragDrop.WinUI.Services;
using Microsoft.UI.Xaml;
using Microsoft.UI.Xaml.Controls;
using System;
using System.Collections.ObjectModel;
using System.Linq;
using System.Threading.Tasks;

namespace Lattice.Example.DragDrop;

public sealed partial class MainWindow : Window
{
    private readonly ObservableCollection<DragDropItem> _sourceItems = new();
    private readonly ObservableCollection<DragDropItem> _droppedItems = new();

    private WinUIDragDropManager? _dragDropManager;
    private IDragDropService? _dragDropService;

    private int _dragOperationCount = 0;

    public MainWindow()
    {

        // Создаем менеджер перетаскивания
        _dragDropManager = WinUIDragDropFactory.CreateManager(this, manager =>
        {
            // Настраиваем смещение визуального элемента
            manager.DragVisualOffset = new Core.Geometry.Point(-15, -15);
        });

        _dragDropService = _dragDropManager.DragDropService;

        InitializeComponent();

        // Устанавливаем размер окна
        SetWindowSize(1200, 800);

        // Инициализируем данные
        InitializeData();

        // Инициализируем drag & drop систему
        InitializeDragDrop();

        // Устанавливаем контекст данных
        SourceItemsControl.ItemsSource = _sourceItems;
        DroppedItemsControl.ItemsSource = _droppedItems;

        Closed += MainWindow_Closing;
        // Обновляем видимость инструкций
        UpdateDropInstructions();
    }

    private void MainWindow_Closing(object sender, WindowEventArgs args)
    {
        // Очищаем ресурсы
        _dragDropManager?.Dispose();
    }

    private void InitializeData()
    {
        // Создаем тестовые данные для перетаскивания
        _sourceItems.Add(new DragDropItem
        {
            Name = "Document",
            Description = "Microsoft Word document",
            Icon = "Document",
            Type = "File"
        });

        _sourceItems.Add(new DragDropItem
        {
            Name = "Image",
            Description = "PNG image file",
            Icon = "Pictures",
            Type = "File"
        });

        _sourceItems.Add(new DragDropItem
        {
            Name = "Music",
            Description = "MP3 audio file",
            Icon = "Audio",
            Type = "File"
        });

        _sourceItems.Add(new DragDropItem
        {
            Name = "Video",
            Description = "MP4 video file",
            Icon = "Video",
            Type = "File"
        });

        _sourceItems.Add(new DragDropItem
        {
            Name = "Contact",
            Description = "Contact information",
            Icon = "Contact",
            Type = "Data"
        });

        _sourceItems.Add(new DragDropItem
        {
            Name = "Link",
            Description = "Web URL",
            Icon = "Link",
            Type = "Link"
        });

        _sourceItems.Add(new DragDropItem
        {
            Name = "Folder",
            Description = "File system folder",
            Icon = "Folder",
            Type = "Folder"
        });
    }

    private void InitializeDragDrop()
    {
        try
        {

            // Настраиваем кастомный источник перетаскивания
            _dragDropManager.MakeDragSource(CustomDragSource, new DragDropItem
            {
                Name = "Custom Element",
                Description = "This is a custom drag source example",
                Icon = "Favorite",
                Type = "Custom"
            });

            // Настраиваем обработчик для области сброса
            _dragDropManager.MakeDropTarget(DropTargetArea);

            // Подписываемся на события перетаскивания
            _dragDropService.DragStarted += OnDragStarted;
            _dragDropService.DragUpdated += OnDragUpdated;
            _dragDropService.DragCompleted += OnDragCompleted;
            _dragDropService.DragCancelled += OnDragCancelled;
            _dragDropService.DropTargetChanged += OnDropTargetChanged;
            _dragDropService.ErrorOccurred += OnDragDropError;

            UpdateStats();

            StatusText.Text = "Drag & Drop system initialized";
        }
        catch (Exception ex)
        {
            StatusText.Text = $"Failed to initialize Drag & Drop: {ex.Message}";
            ShowErrorDialog("Initialization Error", ex.Message);
        }
    }

    private void OnDragStarted(object? sender, Core.DragDrop.Services.DragStartedEventArgs e)
    {
        _dragOperationCount++;
        UpdateStats();

        StatusText.Text = $"Dragging started: {GetItemName(e.DragInfo.Data)}";
    }

    private void OnDragUpdated(object? sender, Core.DragDrop.Services.DragUpdatedEventArgs e)
    {
        StatusText.Text = $"Dragging: {GetItemName(e.DragInfo.Data)} at ({e.Position.X:F0}, {e.Position.Y:F0})";
    }

    private void OnDragCompleted(object? sender, Core.DragDrop.Services.DragCompletedEventArgs e)
    {
        // Проверяем, что элемент сброшен на нашу область
        if (e.DragInfo.Data is DragDropItem item)
        {
            // Добавляем элемент в список сброшенных
            DispatcherQueue.TryEnqueue(() =>
            {
                if (!_droppedItems.Contains(item))
                {
                    _droppedItems.Add(item);

                    // Удаляем из источников, если это не кастомный элемент
                    if (_sourceItems.Contains(item) && item.Name != "Custom Element")
                    {
                        _sourceItems.Remove(item);
                    }

                    UpdateStats();
                    UpdateDropInstructions();
                    StatusText.Text = $"Item dropped: {item.Name}";

                    // Показываем уведомление
                    ShowDropNotification(item);
                }
            });
        }
        else
        {
            StatusText.Text = "Drag completed";
        }
    }

    private async void ShowDropNotification(DragDropItem item)
    {
        var notification = new TeachingTip
        {
            Title = "Item Dropped",
            Subtitle = $"Successfully dropped '{item.Name}'",
            IsOpen = true,
            PreferredPlacement = TeachingTipPlacementMode.TopRight,
            Target = DropTargetArea
        };

        // Автоматически скрываем через 3 секунды
        await Task.Delay(3000);
        notification.IsOpen = false;
    }

    private void OnDragCancelled(object? sender, Core.DragDrop.Services.DragCancelledEventArgs e)
    {
        StatusText.Text = "Drag cancelled";
    }

    private void OnDropTargetChanged(object? sender, Core.DragDrop.Services.DropTargetChangedEventArgs e)
    {
        if (e.Target != null)
        {
            StatusText.Text = "Over drop target";
        }
        else
        {
            StatusText.Text = "Not over drop target";
        }
    }

    private async void OnDragDropError(object? sender, Core.DragDrop.Services.DragDropErrorEventArgs e)
    {
        StatusText.Text = $"Error: {e.Exception.Message}";
        await ShowErrorDialog("Drag & Drop Error", e.Exception.Message);
    }

    private string GetItemName(object? data)
    {
        if (data is DragDropItem item)
        {
            return item.Name;
        }
        return data?.ToString() ?? "Unknown";
    }

    private void UpdateStats()
    {
        DispatcherQueue.TryEnqueue(() =>
        {
            DragStatsText.Text = $"Drag operations: {_dragOperationCount}";
            DropStatsText.Text = $"Dropped items: {_droppedItems.Count}";
        });
    }

    private void UpdateDropInstructions()
    {
        DropInstructionsBorder.Visibility = _droppedItems.Count == 0 ?
            Visibility.Visible : Visibility.Collapsed;
    }

    private void OnThemeToggleToggled(object sender, RoutedEventArgs e)
    {
        if (sender is ToggleSwitch toggle)
        {
            try
            {
                var themeManager = ThemeManager.Current;
                if (toggle.IsOn)
                {
                    themeManager.ApplyTheme("Fluent Dark");
                }
                else
                {
                    themeManager.ApplyTheme("Fluent");
                }

                StatusText.Text = $"Theme changed to {(toggle.IsOn ? "Dark" : "Light")}";
            }
            catch (Exception ex)
            {
                StatusText.Text = $"Failed to change theme: {ex.Message}";
            }
        }
    }

    private async void OnStatsButtonClick(object sender, RoutedEventArgs e)
    {
        if (_dragDropService != null)
        {
            var stats = _dragDropService.GetStats();

            var dialog = new ContentDialog
            {
                Title = "Drag & Drop Statistics",
                Content = new ScrollViewer
                {
                    Content = new StackPanel
                    {
                        Spacing = 8,
                        Children =
                        {
                            CreateStatRow("Total Drag Operations:", stats.TotalDragOperations.ToString()),
                            CreateStatRow("Successful Drops:", stats.SuccessfulDrops.ToString()),
                            CreateStatRow("Cancelled Operations:", stats.CancelledOperations.ToString()),
                            CreateStatRow("Errors:", stats.ErrorCount.ToString()),
                            CreateStatRow("Registered Targets:", stats.RegisteredTargets.ToString()),
                            CreateStatRow("Average Operation Time:",
                                stats.AverageOperationTime.TotalMilliseconds.ToString("F0") + "ms")
                        }
                    }
                },
                PrimaryButtonText = "OK",
                XamlRoot = Content.XamlRoot
            };

            await dialog.ShowAsync();
        }
    }

    private StackPanel CreateStatRow(string label, string value)
    {
        return new StackPanel
        {
            Orientation = Orientation.Horizontal,
            Spacing = 10,
            Children =
            {
                new TextBlock
                {
                    Text = label,
                    FontWeight = Microsoft.UI.Text.FontWeights.SemiBold,
                    Width = 200
                },
                new TextBlock
                {
                    Text = value
                }
            }
        };
    }

    private void OnRemoveItemClick(object sender, RoutedEventArgs e)
    {
        if (sender is Button button && button.Tag is DragDropItem item)
        {
            _droppedItems.Remove(item);
            UpdateStats();
            UpdateDropInstructions();

            // Добавляем обратно в источники, если это не кастомный элемент
            if (item.Name != "Custom Element" && !_sourceItems.Contains(item))
            {
                _sourceItems.Add(item);
            }

            StatusText.Text = $"Item removed: {item.Name}";
        }
    }

    private void OnResetPanelsClick(object sender, RoutedEventArgs e)
    {
        // Очищаем все сброшенные элементы
        foreach (var item in _droppedItems.ToList())
        {
            if (item.Name != "Custom Element" && !_sourceItems.Contains(item))
            {
                _sourceItems.Add(item);
            }
        }
        _droppedItems.Clear();
        UpdateStats();
        UpdateDropInstructions();

        StatusText.Text = "Panels reset";
    }

    private async Task ShowErrorDialog(string title, string message)
    {
        var dialog = new ContentDialog
        {
            Title = title,
            Content = message,
            PrimaryButtonText = "OK",
            XamlRoot = Content.XamlRoot
        };

        await dialog.ShowAsync();
    }

    // Метод для установки размера окна
    private void SetWindowSize(int width, int height)
    {
        try
        {
            var hwnd = WinRT.Interop.WindowNative.GetWindowHandle(this);
            var windowId = Microsoft.UI.Win32Interop.GetWindowIdFromWindow(hwnd);
            var appWindow = Microsoft.UI.Windowing.AppWindow.GetFromWindowId(windowId);

            appWindow.Resize(new Windows.Graphics.SizeInt32(width, height));

            // Центрируем окно
            var displayArea = Microsoft.UI.Windowing.DisplayArea.GetFromWindowId(windowId,
                Microsoft.UI.Windowing.DisplayAreaFallback.Primary);
            var centerX = (displayArea.WorkArea.Width - width) / 2;
            var centerY = (displayArea.WorkArea.Height - height) / 2;

            appWindow.Move(new Windows.Graphics.PointInt32(centerX, centerY));
        }
        catch (Exception ex)
        {
            // Игнорируем ошибки при установке размера окна
            System.Diagnostics.Debug.WriteLine($"Failed to set window size: {ex.Message}");
        }
    }
}