import {z} from 'zod'

export type EventVersion = string;

export type ResourceVersion = string;

export type Resource = {[key: string]: unknown};

export type LinkDescription = {href: string, rel: string, method?: ('GET' | 'POST' | 'PUT' | 'DELETE' | 'HEAD' | 'CONNECT' | 'OPTIONS' | 'PATCH') | undefined};

export type LinkDescriptionList = Array<LinkDescription>;

export type Event = {id?: string | undefined, create_time?: string | undefined, resource_type?: string | undefined, event_version?: EventVersion | undefined, event_type?: string | undefined, summary?: string | undefined, resource_version?: ResourceVersion | undefined, resource?: Resource | undefined, links?: LinkDescriptionList | undefined};

export type VerifyWebhookSignature = {auth_algo: string, cert_url: string, transmission_id: string, transmission_sig: string, transmission_time: string, webhook_id: string, webhook_event: Event};

export type CreateApiV1NotificationsVerifyWebhookSignatureArgs = {body: VerifyWebhookSignature};

export type CreateApiV1NotificationsVerifyWebhookSignatureOptions = {baseUrl?: string | undefined, Oauth2?: string | undefined, fetch?: typeof fetch | undefined};

export const verifyWebhookSignatureResponse = z.object({verification_status: z.enum(["SUCCESS", "FAILURE"])});

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
};

/**
 * Verify webhook signature
 * 
 * POST /v1/notifications/verify-webhook-signature
 */
export const createApiV1NotificationsVerifyWebhookSignature = async (args: CreateApiV1NotificationsVerifyWebhookSignatureArgs, options?: CreateApiV1NotificationsVerifyWebhookSignatureOptions) => {
const {baseUrl = "https://api-m.paypal.com", fetch: fetchFn = fetch, Oauth2} = options ?? {}

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

if (Oauth2 !== undefined) headers.set('authorization', `Bearer ${Oauth2}`)

const url = `${baseUrl.replace(/\/+$/, '')}/v1/notifications/verify-webhook-signature${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "POST", headers, body: JSON.stringify(args.body)})

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

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