import { ParsedLabelers, formatLabelerHeader } from '../util.js'

export const BSKY_USER_AGENT = 'BskyAppView'
export const ATPROTO_CONTENT_LABELERS = 'Atproto-Content-Labelers'
export const ATPROTO_REPO_REV = 'Atproto-Repo-Rev'

type ResHeaderOpts = {
  labelers: ParsedLabelers
  repoRev: string | null
}

export const resHeaders = (
  opts: Partial<ResHeaderOpts>,
): Record<string, string> => {
  const headers = {}
  if (opts.labelers) {
    headers[ATPROTO_CONTENT_LABELERS] = formatLabelerHeader(opts.labelers)
  }
  if (opts.repoRev) {
    headers[ATPROTO_REPO_REV] = opts.repoRev
  }
  return headers
}

export const clearlyBadCursor = (cursor?: string) => {
  // hallmark of v1 cursor, highly unlikely in v2 cursors based on time or rkeys
  return !!cursor?.includes('::')
}