using System.Collections.Specialized;
using System.Windows.Documents;

namespace QuikDawEditor.EDITING.MiscClasses;

public class BindableTextBlock : TextBlock
{
    public ObservableCollection<Inline> InlineList
    {
        get { return (ObservableCollection<Inline>)GetValue(InlineListProperty); }
        set { SetValue(InlineListProperty, value); }
    }

    public static readonly DependencyProperty InlineListProperty =
        DependencyProperty.Register("InlineList", typeof(ObservableCollection<Inline>), typeof(BindableTextBlock), new UIPropertyMetadata(null, OnPropertyChanged));

    private static void OnPropertyChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
    {
        BindableTextBlock textBlock = (BindableTextBlock)sender;

        // subscribe to collection changed
        textBlock.UpdateInlineListSource((ObservableCollection<Inline>)e.OldValue, (ObservableCollection<Inline>)e.NewValue);

    }

    public void UpdateInlineListSource(ObservableCollection<Inline> oldCollection, ObservableCollection<Inline> newCollection)
    {
        if (oldCollection != null)
            oldCollection.CollectionChanged -= OnCollectionChanged;

        if (newCollection != null)
        {
            newCollection.CollectionChanged += OnCollectionChanged;
            OnCollectionChanged(this, new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset));
            OnCollectionChanged(this, new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, newCollection));
        }
    }


    private void OnCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
    {
        var newItems = e.NewItems?.Cast<Inline>()?.ToList() ?? new List<Inline>();
        var oldItems = e.OldItems?.Cast<Inline>()?.ToList() ?? new List<Inline>();

        // changed source
        if (e.Action == NotifyCollectionChangedAction.Reset)
            Inlines.Clear();

        foreach (var itemForDelete in oldItems.ToList())
        {
            if (Inlines.Contains(itemForDelete))
                Inlines.Remove(itemForDelete);
        }

        foreach (var itemsForAdd in newItems)
        {
            Inlines.Add(itemsForAdd);
        }
    }


}