import type { Root as MdastRoot } from 'mdast';
import { CONTINUE, visit } from 'unist-util-visit';

export function remarkRemoveEmptyEmphases() {
  return function (root: MdastRoot) {
    return removeEmptyEmphases(root);
  };
}

function removeEmptyEmphases(root: MdastRoot) {
  visit(root, function (node, index, parent) {
    if (node.type !== 'emphasis' && node.type !== 'strong') return CONTINUE;
    if (node.children.length === 0) {
      if (!parent || typeof index !== 'number') return CONTINUE;
      parent.children.splice(index, 1);
    }
  });
}