import { parseSafeXml, type ParsedXmlElement } from "./parser";

export interface DeadPropertyFragment {
  nsUri: string;
  localName: string;
  xmlValue: string;
}

function collectNamespaces(element: ParsedXmlElement): Record<string, string> {
  const namespaces: Record<string, string> = {};
  for (const [name, value] of Object.entries(element.attributes)) {
    if (name === "xmlns") namespaces[""] = value;
    if (name.startsWith("xmlns:")) namespaces[name.slice("xmlns:".length)] = value;
  }
  return namespaces;
}

function splitName(name: string): { prefix: string; localName: string } {
  const index = name.indexOf(":");
  if (index === -1) return { prefix: "", localName: name };
  return { prefix: name.slice(0, index), localName: name.slice(index + 1) };
}

export function extractDeadPropertyFragment(xml: string): DeadPropertyFragment {
  const { root } = parseSafeXml(xml);
  const namespaces = collectNamespaces(root);
  const { prefix, localName } = splitName(root.name);
  return {
    nsUri: namespaces[prefix] ?? "",
    localName,
    xmlValue: xml,
  };
}