using System;
using System.Collections;
using System.ComponentModel;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;
using ytLive.Helpers;
using ytLive.Models;
using ytLive.ViewModels;

namespace ytLive;

public partial class MainWindow : Window
{
    private readonly MainViewModel _viewModel;
    private Controls.TopBar _topBar = null!;
    private Controls.PreviewPane _previewPane = null!;

    public MainWindow()
    {
        AppLog.Write("MainWindow ctor: before InitializeComponent");
        InitializeComponent();
        AppLog.Write("MainWindow ctor: after InitializeComponent");
        _viewModel = (MainViewModel)DataContext;
        _viewModel.InitWebView2(WebViewHostPanel);
        _viewModel.PropertyChanged += OnViewModelPropertyChanged;
        _viewModel.ChatMessages.CollectionChanged += OnChatMessagesChanged;
        _topBar = (Controls.TopBar)FindName("TopBar")!;
        _previewPane = (Controls.PreviewPane)FindName("PreviewPane")!;
        UpdateTaskbarOverlay();
        UpdateSelectionOverlay();
        _topBar.RefreshAvatar();
        RestoreWindowGeometry();
        AppLog.Write("MainWindow ctor: end");
    }

    private void MainWindow_Loaded(object sender, RoutedEventArgs e)
    {
        AppLog.Write("MainWindow loaded");
    }

    // ─── Window geometry persistence (launch size/position) ───
    // Saved on close (RestoreBounds so a maximized window remembers its
    // un-maximize rect); restored in the ctor before the window is shown.
    // Values clamp to the minimums and to the primary work area — a position
    // saved on a since-disconnected secondary monitor falls back on-screen.

    private void RestoreWindowGeometry()
    {
        try
        {
            var saved = _viewModel.RestoreWindowState();
            if (saved == null) return;
            var (left, top, width, height, state) = saved.Value;

            var work = SystemParameters.WorkArea;
            width = Math.Clamp(width, MinWidth, work.Width);
            height = Math.Clamp(height, MinHeight, work.Height);
            left = Math.Clamp(left, work.Left - width + 120, work.Right - 120);
            top = Math.Clamp(top, work.Top, work.Bottom - 80);

            Left = left;
            Top = top;
            Width = width;
            Height = height;
            if (state == "Maximized") WindowState = WindowState.Maximized;
        }
        catch (Exception ex)
        {
            AppLog.Write($"Window geometry restore failed: {ex.Message}");
        }
    }

    private void SaveWindowGeometry()
    {
        try
        {
            var bounds = RestoreBounds;
            var state = WindowState == WindowState.Maximized ? "Maximized" : "Normal";
            _viewModel.PersistWindowState(bounds.Left, bounds.Top, bounds.Width, bounds.Height, state);
        }
        catch (Exception ex)
        {
            AppLog.Write($"Window geometry save failed: {ex.Message}");
        }
    }

    private ytLive.Services.GlobalHotkeyManager? _hotkeys;

    protected override void OnSourceInitialized(EventArgs e)
    {
        base.OnSourceInitialized(e);
        _hotkeys = new ytLive.Services.GlobalHotkeyManager();
        _hotkeys.Activated += id => _viewModel.HandleHotkey(id);
        _hotkeys.Attach(this, _viewModel.CurrentHotkeyBindings);
        _viewModel.HotkeyBindingsChanged = bindings => _hotkeys.Reattach(this, bindings);
    }

    private void Window_ContextMenuOpening(object sender, ContextMenuEventArgs e)
    {
        if (!_viewModel.IsEditMode)
            e.Handled = true;
    }

    private void OnViewModelPropertyChanged(object? sender, PropertyChangedEventArgs e)
    {
        if (e.PropertyName == nameof(MainViewModel.IsLive))
            UpdateTaskbarOverlay();
        else if (e.PropertyName == nameof(MainViewModel.SelectedElement))
            UpdateSelectionOverlay();
        else if (e.PropertyName == nameof(MainViewModel.AccountAvatarUrl)
              || e.PropertyName == nameof(MainViewModel.IsConnected))
            _topBar.RefreshAvatar();
    }

    private void MainWindow_Closing(object? sender, CancelEventArgs e)
    {
        SaveWindowGeometry();
        _viewModel.Shutdown();
    }

    private void MainWindow_Activated(object? sender, EventArgs e)
    {
        _viewModel.RefreshBackgroundAutoCapture();
    }

    private void MainWindow_Deactivated(object? sender, EventArgs e)
    {
    }

    private void UpdateTaskbarOverlay()
    {
        TaskbarInfo.Overlay = _viewModel.IsLive
            ? (ImageSource)FindResource("LiveOverlay")
            : null;
    }

    private void SourceNameBox_IsVisibleChanged(object sender, DependencyPropertyChangedEventArgs e)
    {
        if (sender is TextBox { IsVisible: true } box)
        {
            box.Focus();
            box.SelectAll();
        }
    }

    private void BackToAbout_Click(object sender, RoutedEventArgs e)
    {
        if (DataContext is ViewModels.MainViewModel vm)
        {
            vm.IsLicensesOpen = false;
            vm.IsLicenseEntryOpen = false;
        }
    }

    private void AddSourceButton_Click(object sender, RoutedEventArgs e)
    {
        if (sender is Button { ContextMenu: { } menu } button)
        {
            menu.PlacementTarget = button;
            menu.Placement = System.Windows.Controls.Primitives.PlacementMode.Bottom;
            menu.IsOpen = true;
        }
    }


    private void Window_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
    {
        if (e.OriginalSource is not DependencyObject original) return;
        var form = _viewModel.BroadcastForm;
        if (form.IsDrawerOpen && !_previewPane.IsClickInsideDrawer(original))
            form.CloseDrawerCommand.Execute(null);
        if (_previewPane.IsClickInsidePreview(original)) return;
        if (IsDescendantOf(original, SourceList)) return;
        if (IsDescendantOf(original, ElementsScrollViewer)) return;
        _viewModel.SelectedElement = null;
    }

    private static bool IsDescendantOf(DependencyObject? child, DependencyObject ancestor)
    {
        while (child != null && !ReferenceEquals(child, ancestor))
        {
            child = child is System.Windows.Media.Visual or System.Windows.Media.Media3D.Visual3D
                ? VisualTreeHelper.GetParent(child)
                : LogicalTreeHelper.GetParent(child);
        }
        return child != null;
    }

    private void UpdateSelectionOverlay()
    {
        if (!_viewModel.IsEditMode)
        {
            _previewPane.UpdateSelectionOverlay(false);
            return;
        }
        var selected = _viewModel.SelectedElement is { } s && Controls.PreviewPane.IsDraggableElement(s);
        _previewPane.UpdateSelectionOverlay(selected);
        if (selected)
            OpacityValueText.Text = $"{Math.Round(_viewModel.SelectedElement!.Opacity * 100)}%";
        TakeSnapshot();
    }

    private void OnChatMessagesChanged(object? sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
    {
        if (e.Action == System.Collections.Specialized.NotifyCollectionChangedAction.Add)
        {
            ChatListBox.ScrollIntoView(ChatListBox.Items[^1]);
        }
    }

    private void MirrorButton_Click(object sender, RoutedEventArgs e)
    {
        if (_viewModel.SelectedElement is WebcamSceneConfig webcam)
            webcam.IsMirrored = !webcam.IsMirrored;
    }

    private void ShapeButton_Click(object sender, RoutedEventArgs e)
    {
        if (_viewModel.SelectedElement is WebcamSceneConfig webcam)
            webcam.ToggleClipShape();
    }

    private void SourceMenu_Remove(object sender, RoutedEventArgs e)
    {
        if (sender is MenuItem { DataContext: SceneElement element })
            _viewModel.RemoveSourceCommand.Execute(element);
    }

    private void BackgroundMenu_ChangeCapture(object sender, RoutedEventArgs e)
    {
        _ = _viewModel.ChangeBackgroundCaptureAsync();
    }

    private void BackgroundMenu_RefreshCapture(object sender, RoutedEventArgs e)
    {
        _viewModel.RefreshBackgroundAutoCapture();
    }

    private void OpacitySlider_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
        => OpacityValueText.Text = $"{Math.Round(e.NewValue * 100)}%";


    private void SourceNameBox_KeyDown(object sender, KeyEventArgs e)
    {
        if (e.Key is Key.Enter or Key.Escape)
        {
            CommitSourceEdit(sender);
            e.Handled = true;
        }
    }

    private void SourceNameBox_LostFocus(object sender, RoutedEventArgs e)
    {
        CommitSourceEdit(sender);
    }

    private static void CommitSourceEdit(object sender)
    {
        if (sender is FrameworkElement { DataContext: SceneElement element })
            element.IsEditing = false;
    }

    // ─── List drag-to-reorder (scenes list + sources list) ───
    private Point _dragStartPoint;
    private int _dragIndex = -1;
    private bool _isDragging;
    private object? _lastHoveredItem;

    private void List_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
    {
        var listBox = (ListBox)sender;
        var item = FindItemContainerAt(listBox, e.GetPosition(listBox));
        if (item == null)
        {
            if (ReferenceEquals(listBox, SourceList))
                _viewModel.SelectedElement = null;
            _dragIndex = -1;
            return;
        }
        if (listBox.ItemsSource is not IList items || items.Count == 0)
        {
            _dragIndex = -1;
            return;
        }
        _dragIndex = listBox.Items.IndexOf(item.DataContext);
        _dragStartPoint = e.GetPosition(listBox);
        _isDragging = false;
        _lastHoveredItem = null;
    }

    private void List_PreviewMouseMove(object sender, MouseEventArgs e)
    {
        if (_dragIndex < 0) return;
        var listBox = (ListBox)sender;
        if (e.LeftButton != MouseButtonState.Pressed || listBox.ItemsSource is not IList items)
        {
            EndListDrag(listBox);
            return;
        }

        var position = e.GetPosition(listBox);
        if (!_isDragging)
        {
            if (Math.Abs(position.X - _dragStartPoint.X) < SystemParameters.MinimumHorizontalDragDistance &&
                Math.Abs(position.Y - _dragStartPoint.Y) < SystemParameters.MinimumVerticalDragDistance)
                return;
            _isDragging = true;
            listBox.CaptureMouse();
        }

        var item = FindItemContainerAt(listBox, position);
        if (item == null) return;

        var targetItem = item.DataContext;
        if (ReferenceEquals(targetItem, items[_dragIndex]) || ReferenceEquals(targetItem, _lastHoveredItem))
            return;

        var targetIndex = listBox.Items.IndexOf(targetItem);
        if (targetIndex < 0) return;

        var dragged = items[_dragIndex];
        items.RemoveAt(_dragIndex);
        items.Insert(targetIndex, dragged);
        _dragIndex = targetIndex;
        _lastHoveredItem = targetItem;
    }

    private void List_PreviewMouseLeftButtonUp(object sender, MouseButtonEventArgs e)
    {
        EndListDrag((ListBox)sender);
    }

    private void EndListDrag(ListBox listBox)
    {
        if (_isDragging)
            listBox.ReleaseMouseCapture();
        _dragIndex = -1;
        _isDragging = false;
        _lastHoveredItem = null;
    }

    private static ListBoxItem? FindItemContainerAt(ListBox listBox, Point position)
    {
        var hit = listBox.InputHitTest(position) as DependencyObject;
        while (hit != null && hit != listBox)
        {
            if (hit is ListBoxItem item) return item;
            hit = VisualTreeHelper.GetParent(hit);
        }
        return null;
    }

    private Models.SceneElement? _snapshotElement;
    private string _snapshotBorderColor = string.Empty;
    private int _snapshotBorderWidth;
    private int _snapshotTimerMinutes = 15;
    private string? _snapshotWebUri;

    private void TakeSnapshot()
    {
        if (_viewModel.SelectedElement is Models.Source src)
        {
            _snapshotElement = src;
            _snapshotBorderColor = src.BorderColor;
            _snapshotBorderWidth = src.BorderWidth;
            _snapshotTimerMinutes = src.TimerMinutes;
            _snapshotWebUri = src.WebUri;
        }
    }

    private void WebcamBorderColorPicker_Click(object sender, RoutedEventArgs e)
    {
        if (_viewModel.SelectedElement is not SceneElement src) return;
        if (sender is FrameworkElement fe && fe.ContextMenu == null)
        {
            var menu = new System.Windows.Controls.ContextMenu();
            string[] colors = ["#FFFFFF", "#000000", "#FF0000", "#00FF00", "#0000FF",
                               "#FFFF00", "#FF00FF", "#00FFFF", "#FF8800", "#8800FF",
                               "#e94560", "#22c55e", "#3b82f6", "#f59e0b"];
            foreach (var c in colors)
            {
                var item = new System.Windows.Controls.MenuItem { Header = c, ToolTip = c };
                var brush = new System.Windows.Media.SolidColorBrush(
                    (System.Windows.Media.Color)System.Windows.Media.ColorConverter.ConvertFromString(c));
                item.Icon = new System.Windows.Controls.Border
                {
                    Width = 16, Height = 16,
                    Background = brush,
                    CornerRadius = new System.Windows.CornerRadius(2)
                };
                var color = c;
                item.Click += (_, _) => src.BorderColor = color;
                menu.Items.Add(item);
            }
            fe.ContextMenu = menu;
        }
        if (sender is FrameworkElement fe2)
            fe2.ContextMenu.IsOpen = true;
    }

    private void WebcamBorderRevert_Click(object sender, RoutedEventArgs e)
    {
        if (_snapshotElement is Models.Source src)
        {
            src.BorderColor = _snapshotBorderColor;
            src.BorderWidth = _snapshotBorderWidth;
        }
    }

    private void WebcamBorderAccept_Click(object sender, RoutedEventArgs e)
    {
        if (_snapshotElement is Models.Source src)
        {
            _snapshotBorderColor = src.BorderColor;
            _snapshotBorderWidth = src.BorderWidth;
        }
    }

    private void CountdownRevert_Click(object sender, RoutedEventArgs e)
    {
        if (_snapshotElement is Models.Source src)
            src.TimerMinutes = _snapshotTimerMinutes;
    }

    private void CountdownAccept_Click(object sender, RoutedEventArgs e)
    {
        if (_snapshotElement is Models.Source src)
            _snapshotTimerMinutes = src.TimerMinutes;
    }

    private void WebRevert_Click(object sender, RoutedEventArgs e)
    {
        if (_snapshotElement is Models.Source src)
            src.WebUri = string.Empty;
        _snapshotWebUri = string.Empty;
    }

    private void WebAccept_Click(object sender, RoutedEventArgs e)
    {
        if (_snapshotElement is Models.Source src)
            _snapshotWebUri = src.WebUri;
    }
}