import {z} from 'zod'

export type GetApiV2WebhookArgs = {topic?: string | undefined, authorization: string, 'Content-Type': string};

export type GetApiV2WebhookOptions = {baseUrl?: string | undefined, fetch?: typeof fetch | undefined};

export const webhookGetResponse = z.object({webhooks: z.array(z.object({id: z.number().int().optional(), topic: z.string().optional(), url: z.string().optional(), payloadVersion: z.string().optional()})).optional()});

export const schema200failure = z.object({error: z.object({code: z.string().optional(), message: z.string().optional(), help: z.string().optional()}).optional(), reasonCodes: z.array(z.string()).optional()});

export const getApiV2WebhookResponse = z.union([webhookGetResponse, schema200failure]);

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
};

/**
 * webhook
 * 
 * GET /v2/webhook
 */
export const getApiV2Webhook = async (args: GetApiV2WebhookArgs, options?: GetApiV2WebhookOptions) => {
const {baseUrl = "https://api.sandbox-pay.aero.inc", fetch: fetchFn = fetch} = options ?? {}

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

if (args.topic != null) query.append("topic", String(args.topic))
if (args.authorization != null) headers.set("authorization", String(args.authorization))
if (args['Content-Type'] != null) headers.set("Content-Type", String(args['Content-Type']))

const url = `${baseUrl.replace(/\/+$/, '')}/v2/webhook${query.size > 0 ? `?${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(getApiV2WebhookResponse, await res.json())
};