using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Threading;
using Explorer.Presentation.ViewModels;

namespace Explorer.App;

public partial class ExplorerAddressBar : UserControl
{
    private bool _suppressLostFocus;

    public ExplorerAddressBar()
    {
        InitializeComponent();
        DataContextChanged += OnDataContextChanged;
        IsVisibleChanged += (_, _) =>
        {
            if (IsVisible && DataContext is ExplorerPaneViewModel { IsEditingPath: true })
            {
                FocusEditor();
            }
        };
    }

    public void FocusEditor()
    {
        Dispatcher.BeginInvoke(() =>
        {
            PathCombo.ApplyTemplate();
            if (PathCombo.Template.FindName("PART_EditableTextBox", PathCombo) is TextBox box)
            {
                box.Focus();
                box.SelectAll();
            }
            else
            {
                PathCombo.Focus();
            }
        }, DispatcherPriority.Loaded);
    }

    private void OnDataContextChanged(object sender, DependencyPropertyChangedEventArgs e)
    {
        if (e.OldValue is ExplorerPaneViewModel previous)
        {
            previous.PropertyChanged -= OnPanePropertyChanged;
        }

        if (e.NewValue is ExplorerPaneViewModel pane)
        {
            pane.PropertyChanged += OnPanePropertyChanged;
            if (pane.IsEditingPath)
            {
                FocusEditor();
            }
        }
    }

    private void OnPanePropertyChanged(object? sender, System.ComponentModel.PropertyChangedEventArgs e)
    {
        if (e.PropertyName == nameof(ExplorerPaneViewModel.IsEditingPath)
            && sender is ExplorerPaneViewModel { IsEditingPath: true })
        {
            FocusEditor();
        }
    }

    private void OnBreadcrumbMouseDown(object sender, MouseButtonEventArgs e)
    {
        if (e.OriginalSource is DependencyObject origin && IsInsideButton(origin))
        {
            return;
        }

        if (DataContext is not ExplorerPaneViewModel pane)
        {
            return;
        }

        pane.BeginEditPath();
        e.Handled = true;
    }

    private void OnPathKeyDown(object sender, KeyEventArgs e)
    {
        if (DataContext is not ExplorerPaneViewModel pane)
        {
            return;
        }

        if (e.Key == Key.Enter)
        {
            CommitPath();
            e.Handled = true;
            return;
        }

        if (e.Key == Key.Escape)
        {
            _suppressLostFocus = true;
            pane.CancelEditPath();
            e.Handled = true;
        }
    }

    private void OnPathHistorySelected(object sender, SelectionChangedEventArgs e)
    {
        if (sender is not ComboBox combo || e.AddedItems.Count == 0 || e.AddedItems[0] is not string path)
        {
            return;
        }

        if (DataContext is not ExplorerPaneViewModel pane)
        {
            return;
        }

        if (NavigationTreeViewModel.PathsEqual(path, pane.CurrentPath))
        {
            return;
        }

        if (combo.IsDropDownOpen || combo.IsKeyboardFocusWithin)
        {
            pane.PathEditText = path;
            CommitPath();
        }
    }

    private void OnPathLostKeyboardFocus(object sender, KeyboardFocusChangedEventArgs e)
    {
        Dispatcher.BeginInvoke(() =>
        {
            if (_suppressLostFocus)
            {
                _suppressLostFocus = false;
                return;
            }

            if (PathCombo.IsDropDownOpen || PathCombo.IsKeyboardFocusWithin)
            {
                return;
            }

            if (DataContext is ExplorerPaneViewModel pane)
            {
                pane.CancelEditPath();
            }
        }, DispatcherPriority.Input);
    }

    private void CommitPath()
    {
        if (Window.GetWindow(this)?.DataContext is MainViewModel vm)
        {
            vm.GoCommand.Execute(null);
        }
    }

    private static bool IsInsideButton(DependencyObject origin)
    {
        for (var current = origin; current is not null;)
        {
            if (current is Button)
            {
                return true;
            }

            current = current is Visual
                ? VisualTreeHelper.GetParent(current)
                : LogicalTreeHelper.GetParent(current);
        }

        return false;
    }
}