namespace HaDocument.Settings.XMLRoots;
using System.Xml.Linq;

public class DescriptionsRoot : HaDocument.Interfaces.IXMLRoot {
    public string Type { get; } = "Metadaten";
    public string Prefix { get; } = "metadaten";
    public string[] XPathContainer { get; } = { ".//data/descriptions", ".//descriptions" };

    public Predicate<XElement> IsCollectedObject { get; } = (elem) => {
        if (elem.Name == "letterDesc") return true;
        return false;
    };

    // public Func<XElement, string?> GetKey { get; } = (elem) => {
    //     var index = elem.Attribute("ref");
    //     if (index != null && !String.IsNullOrWhiteSpace(index.Value))
    //         return index.Value;
    //     else return null;
    // };

    // public List<(string, string?)>? GenerateFields(XMLRootDocument document) {
    //     return null;
    // }

    public (string?, string?) GenerateIdentificationString(XElement element) {
        return (null, null);
    }

    // public bool Replaces(XMLRootDocument doc1, XMLRootDocument doc2) {
    //     return true;
    // }

    public XElement CreateHamannDocument(XElement element) {
        var opus = new XElement("opus");
        opus.AddFirst(element);
        return opus;
    }

    // public void MergeIntoFile(XElement file, XMLRootDocument document) {
    //     if (file.Element("descriptions") == null)
    //         file.AddFirst(new XElement("descriptions"));
    //     var elements = document.Root.Elements().Where(x => IsCollectedObject(x));
    //     var root = file.Element("descriptions");
    //     foreach (var element in elements) {
    //         root!.Add(element);
    //     }
    // }

}