/* oxlint-disable no-base-to-string */
import { DOMParser } from "@xmldom/xmldom";
import type { CallTemplateFunctionArgs, Context, PluginDefinition } from "@yaakapp/api";
import xpath from "xpath";

const RETURN_FIRST = "first";
const RETURN_ALL = "all";
const RETURN_JOIN = "join";

export const plugin: PluginDefinition = {
  templateFunctions: [
    {
      name: "xml.xpath",
      description: "Filter XML-formatted text using XPath syntax",
      previewArgs: ["query"],
      args: [
        {
          type: "text",
          name: "input",
          label: "Input",
          multiLine: true,
          placeholder: "<foo></foo>",
        },
        {
          type: "h_stack",
          inputs: [
            {
              type: "select",
              name: "result",
              label: "Return Format",
              defaultValue: RETURN_FIRST,
              options: [
                { label: "First result", value: RETURN_FIRST },
                { label: "All results", value: RETURN_ALL },
                { label: "Join with separator", value: RETURN_JOIN },
              ],
            },
            {
              name: "join",
              type: "text",
              label: "Separator",
              optional: true,
              defaultValue: ", ",
              dynamic(_ctx, args) {
                return { hidden: args.values.result !== RETURN_JOIN };
              },
            },
          ],
        },
        { type: "text", name: "query", label: "Query", placeholder: "//foo" },
      ],
      async onRender(_ctx: Context, args: CallTemplateFunctionArgs): Promise<string | null> {
        try {
          const result = (args.values.result || RETURN_FIRST) as XPathResult;
          const join = args.values.join == null ? null : String(args.values.join);
          return filterXPath(String(args.values.input), String(args.values.query), result, join);
        } catch {
          return null;
        }
      },
    },
  ],
};

export type XPathResult = "first" | "join" | "all";
export function filterXPath(
  body: string,
  path: string,
  result: XPathResult,
  join: string | null,
): string {
  // oxlint-disable-next-line no-explicit-any
  const doc: any = new DOMParser().parseFromString(body, "text/xml");
  const items = xpath.select(path, doc, false);

  if (!Array.isArray(items)) {
    return String(items);
  }
  if (!Array.isArray(items) || result === "first") {
    return items[0] != null ? String(items[0].firstChild ?? "") : "";
  }
  if (result === "join") {
    return items.map((item) => String(item.firstChild ?? "")).join(join ?? "");
  }
  // Not sure what cases this happens in (?)
  return String(items);
}