import { FmtString } from './format'

export const env = process.env

export type Expand<T> = T extends object
  ? T extends infer O
    ? { [K in keyof O]: O[K] }
    : never
  : T

type MaybeExtra<Extra> = (Extra & { caption?: string }) | undefined

export function fmtCaption<
  Extra extends {
    caption?: string | FmtString
  } & Record<string, unknown>
>(extra?: Extra): MaybeExtra<Extra> {
  const caption = extra?.caption
  if (!caption || typeof caption === 'string') return extra as MaybeExtra<Extra>
  const { text, entities } = caption
  return {
    ...extra,
    caption: text,
    ...(entities && {
      caption_entities: entities,
      parse_mode: undefined,
    }),
  }
}

export function deprecate(
  method: string,
  ignorable: string | undefined,
  use: string | undefined,
  see?: string
) {
  // don't use deprecate() yet
  // wait for a couple minor releases of telegraf so the news reaches more people
  return

  const ignorer = `IGNORE_DEPRECATED_${ignorable}`
  if (env[ignorer]) return

  const stack: { stack: string } = { stack: '' }
  Error.captureStackTrace(stack)
  const line = (stack.stack.split('\n')[3] || '').trim()

  const useOther = use ? `; use ${use} instead` : ''
  const pad = ' '.repeat('[WARN]'.length)

  console.warn(`[WARN] ${method} is deprecated${useOther}`)
  if (line) console.warn(pad, line)
  if (see) console.warn(pad, `SEE ${see}`)
}