//@ts-check

import { isNotNull } from "./isNotNull.mjs";

/**
 * parses a filelist string. That's a string that looks like
 * ```md
 * name dd-mm-yyyy link name
 * name dd-mm-yyyy
 * name linkname
 * name
 * ```
 *
 * @param {string} lines
 */
export const parseFileList = (lines) =>
  // @ts-ignore
  lines
    .trim()
    .split(`\n`)
    .map((line, index) => {
      const today = new Date().toISOString().split("T")[0];
      const result = line.match(
        /(?<name>.+)\.(?<ext>\w{2,3})(?:\s+(?<date>[\d-]+)?(?<title>.+))?/
      );
      if (!result) {
        console.error(`could not parse line number ${index}`);
        return null;
      }
      const {
        // @ts-ignore
        groups: { name, ext, date = today, title = name },
      } = result;
      const href = `/${name}.${ext}`;
      const date_unix = new Date(date).getTime();
      return { name, href, date, title, date_unix, index };
    })
    .filter(isNotNull);

export default parseFileList;