using System.Windows;

namespace OpenTapEditor.UI
{
    public class MvvmTextEditor : ICSharpCode.AvalonEdit.TextEditor
    {
        public static readonly DependencyProperty DocumentTextProperty =
            DependencyProperty.Register(
                "DocumentText",
                typeof(string),
                typeof(MvvmTextEditor),
                new FrameworkPropertyMetadata(
                    string.Empty,
                    FrameworkPropertyMetadataOptions.BindsTwoWayByDefault,
                    OnDocumentTextChanged));

        public string DocumentText
        {
            get { return (string)GetValue(DocumentTextProperty); }
            set { SetValue(DocumentTextProperty, value); }
        }

        private static void OnDocumentTextChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            if (d is MvvmTextEditor editor)
            {
                if (editor.Document != null && editor.Document.Text != (string)e.NewValue)
                {
                    editor.Document.Text = (string)e.NewValue ?? string.Empty;
                }
            }
        }

        protected override void OnTextChanged(EventArgs e)
        {
            SetCurrentValue(DocumentTextProperty, base.Text);
            base.OnTextChanged(e);
        }
    }
}