export const BRACKET_MAP = {
  '{': '}',
  '[': ']',
  '(': ')',
};

export type BracketMapKey = keyof typeof BRACKET_MAP;

export const shouldAutoCloseBracket = (before: string, after: string) => {
  // when directly before a closing bracket
  if (/^[}\])]/.test(after)) {
    return true;
  }

  // exclusion: when directly before a non-whitespace character
  if (/^[^\s]/.test(after)) {
    return false;
  }

  return true;
};

export const getAutoClosingBracketInfo = (before: string, after: string) => {
  const left = (Object.keys(BRACKET_MAP) as Array<BracketMapKey>).find((item) =>
    before.endsWith(item),
  );
  const right = left ? (BRACKET_MAP[left] as string) : undefined;
  const hasTrailingMatchingBracket = right ? after.startsWith(right) : false;
  return { left, right, hasTrailingMatchingBracket };
};