import {z} from 'zod'

export type DateTimeWithZone = string;

export type EventRequest = {transaction_id: string, external_subscription_id: string, metric_code: string, timestamp?: DateTimeWithZone | undefined, properties?: Record<string, never> | undefined};

export type CreateApiEventsBatchArgs = {body: {events?: Array<EventRequest> | undefined}};

export type CreateApiEventsBatchOptions = {baseUrl?: string | undefined, BearerAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const eventStatus = z.literal("ACCEPTED");

export const eventsAcceptedWithResults = z.object({status: eventStatus.optional(), results: z.object({success_count: z.number().int().optional(), error_count: z.number().int().optional(), errors: z.array(z.object({transaction_id: z.string().optional(), error_code: z.string().optional(), error_message: z.string().optional()})).optional()}).optional()});

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
};

/**
 * Create multiple usage events in batch.
 * 
 * POST /events/batch
 */
export const createApiEventsBatch = async (args: CreateApiEventsBatchArgs, options?: CreateApiEventsBatchOptions) => {
const {baseUrl = "https://api-m.sandbox.paypal.com", fetch: fetchFn = fetch, BearerAuth} = options ?? {}

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

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

const url = `${baseUrl.replace(/\/+$/, '')}/events/batch${query.size > 0 ? `?${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(eventsAcceptedWithResults, await res.json())
};