import {z} from 'zod'

export type UserFollowingFeedType = 'ALL' | 'RANKED' | 'CREATOR_ONLY' | 'RANKED_CREATOR_ONLY';

export type GetApiUserAccountFollowingArgs = {ad_account_id?: string | undefined, explicit_following?: boolean | undefined, feed_type?: UserFollowingFeedType | undefined, bookmark?: string | undefined, page_size?: number | undefined};

export type GetApiUserAccountFollowingOptions = {baseUrl?: string | undefined, pinterestOauth2?: string | undefined, fetch?: typeof fetch | undefined};

export const followUser = z.object({type: z.string().optional(), username: z.string().optional()});

export const getApiUserAccountFollowingResponse = z.object({bookmark: z.string().nullable().optional(), items: z.array(followUser)});

export const validateResponse = async <Output>(
  schema: {
    readonly '~standard': {
      readonly validate: (value: unknown) => ({ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }) | Promise<{ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }>
    }
  },
  value: unknown
): Promise<Output> => {
  const result = await schema['~standard'].validate(value)

  if (result.issues !== undefined) {
    const detail = result.issues
      .map(({ message, path }) =>
        path?.length
          ? `${path.map((segment) => String(typeof segment === 'object' ? segment.key : segment)).join('.')}: ${message}`
          : message
      )
      .join('; ')

    throw new Error(`Response does not match the schema: ${detail}`, { cause: { issues: result.issues } })
  }

  return result.value
};

/**
 * List following
 * 
 * GET /user_account/following
 * 
 * Also accepts auth: client_credentials
 */
export const getApiUserAccountFollowing = async (args: GetApiUserAccountFollowingArgs, options?: GetApiUserAccountFollowingOptions) => {
const {baseUrl = "https://api.pinterest.com/v5", fetch: fetchFn = fetch, pinterestOauth2} = options ?? {}

const query = new URLSearchParams()
const headers = new Headers()
headers.set('accept', "application/json")

if (args.ad_account_id != null) query.append("ad_account_id", String(args.ad_account_id))
if (args.explicit_following != null) query.append("explicit_following", String(args.explicit_following))
if (args.feed_type != null) query.append("feed_type", String(args.feed_type))
if (args.bookmark != null) query.append("bookmark", String(args.bookmark))
if (args.page_size != null) query.append("page_size", String(args.page_size))
if (pinterestOauth2 !== undefined) headers.set('authorization', `Bearer ${pinterestOauth2}`)

const url = `${baseUrl.replace(/\/+$/, '')}/user_account/following${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "GET", headers})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(getApiUserAccountFollowingResponse, await res.json())
};