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import type {  AnyVariables,  Client,  OperationContext,  OperationResult,  TypedDocumentNode,} from '@urql/core'import { pipe, subscribe } from 'wonka'import type { Subscription } from 'wonka'import { atom } from 'jotai'import type { Getter, WritableAtom } from 'jotai'import { clientAtom } from './clientAtom'
type Timeout = ReturnType<typeof setTimeout>
type AtomWithSubscriptionAction = {  type: 'refetch'}
type OperationResultWithData<Data, Variables extends AnyVariables> = Omit<  OperationResult<Data, Variables>,  'data'> & { data: Data }
const isOperationResultWithData = <Data, Variables extends AnyVariables>(  result: OperationResult<Data, Variables>): result is OperationResultWithData<Data, Variables> =>  'data' in result && !result.error
type SubscriptionArgs<Data, Variables extends AnyVariables> = {  query: TypedDocumentNode<Data, Variables> | string  variables: Variables  context?: Partial<OperationContext>}
type SubscriptionArgsWithPause<  Data,  Variables extends AnyVariables> = SubscriptionArgs<Data, Variables> & {  pause: boolean}
export function atomWithSubscription<Data, Variables extends AnyVariables>(  createSubscriptionArgs: (get: Getter) => SubscriptionArgs<Data, Variables>,  getClient?: (get: Getter) => Client): WritableAtom<  OperationResultWithData<Data, Variables>,  AtomWithSubscriptionAction>
export function atomWithSubscription<Data, Variables extends AnyVariables>(  createSubscriptionArgs: (    get: Getter  ) => SubscriptionArgsWithPause<Data, Variables>,  getClient?: (get: Getter) => Client): WritableAtom<  OperationResultWithData<Data, Variables> | null,  AtomWithSubscriptionAction>
export function atomWithSubscription<Data, Variables extends AnyVariables>(  createSubscriptionArgs: (get: Getter) => SubscriptionArgs<Data, Variables>,  getClient: (get: Getter) => Client = (get) => get(clientAtom)) {  type Result = OperationResult<Data, Variables>  const queryResultAtom = atom((get) => {    const args = createSubscriptionArgs(get)    if ((args as { pause?: boolean }).pause) {      return null    }    const client = getClient(get)    let resolve: ((result: Result) => void) | null = null    const makePending = () =>      new Promise<Result>((r) => {        resolve = r      })    const resultAtom = atom<Result | Promise<Result>>(makePending())    let setResult: ((result: Result) => void) | null = null    const listener = (result: Result) => {      // FIXME having this check make a error recovery test to fail      // if (!resolve && !setResult) {      //   throw new Error('setting result without mount')      // }      if (resolve) {        resolve(result)        resolve = null      }      if (setResult) {        setResult(result)      }    }    let subscription: Subscription | null = null    let timer: Timeout | undefined    const startSub = () => {      if (subscription) {        clearTimeout(timer)        subscription.unsubscribe()      }      subscription = pipe(        client.subscription(args.query, args.variables, args.context),        subscribe(listener)      )      if (!setResult) {        // not mounted yet        timer = setTimeout(() => {          if (subscription) {            subscription.unsubscribe()            subscription = null          }        }, 1000)      }    }    startSub()    resultAtom.onMount = (update) => {      setResult = update      if (subscription) {        clearTimeout(timer as Timeout)      } else {        startSub()      }      return () => {        setResult = null        if (subscription) {          subscription.unsubscribe()          subscription = null        }      }    }    return { resultAtom, makePending, startSub }  })  const queryAtom = atom(    (get) => {      const queryResult = get(queryResultAtom)      if (!queryResult) {        return null      }      const { resultAtom } = queryResult      const result = get(resultAtom)      if (!isOperationResultWithData(result)) {        throw result.error      }      return result    },    (get, set, action: AtomWithSubscriptionAction) => {      switch (action.type) {        case 'refetch': {          const queryResult = get(queryResultAtom)          if (!queryResult) {            throw new Error('query is paused')          }          const { resultAtom, makePending, startSub } = queryResult          set(resultAtom, makePending())          startSub()          return        }      }    }  )  return queryAtom}