/**
 * What an undo did, in one line: how many changes went back, how many were
 * left because someone edited the field after the automation wrote it, and
 * how many were on pages deleted since.
 *
 * @param {number} reverted - Changes put back.
 * @param {number} skipped  - Changes left, edited since.
 * @param {number} gone     - Changes on pages, terms or users deleted since.
 * @returns {string}
 */
export const revertMessage = (
  reverted: number,
  skipped = 0,
  gone = 0
): string => {
  const lines = [
    reverted === 1 ? 'One change put back.' : `${reverted} changes put back.`,
  ];
  if (skipped > 0) {
    lines.push(
      skipped === 1
        ? 'One field was edited after the automation wrote it and keeps that edit.'
        : `${skipped} fields were edited after the automation wrote them and keep those edits.`
    );
  }
  if (gone > 0) {
    lines.push(
      gone === 1
        ? 'One change was on a page deleted since, so there is nothing to put back.'
        : `${gone} changes were on pages deleted since, so there is nothing to put back.`
    );
  }
  return lines.join(' ');
};