import {z} from 'zod'

export type SpendBackTxn = {client_spendback_id: string, source_token: string, source_currency_code: string, amount: number, notes?: string | undefined, metadata?: Record<string, never> | undefined};

export type CreateApiPayoutSpendbackUserTokenArgs = {'Idempotency-Key'?: string | undefined, body: SpendBackTxn};

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

export const spendBackTxnResp = z.object({spendback_token: z.string(), client_spendback_id: z.string().max(50), status: z.enum(["success", "failure"]), metadata: z.object({}).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
};

/**
 * Initiate a spend back transaction
 * 
 * POST /payout/spendback/{user_token}
 * 
 * Also accepts auth: api_key
 */
export const createApiPayoutSpendbackUserToken = async (args: CreateApiPayoutSpendbackUserTokenArgs, options?: CreateApiPayoutSpendbackUserTokenOptions) => {
const {baseUrl = "https://api.masspay.io/v1.0.0", fetch: fetchFn = fetch, AUTHORIZERNAME} = options ?? {}

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

if (args['Idempotency-Key'] != null) headers.set("Idempotency-Key", String(args['Idempotency-Key']))
if (AUTHORIZERNAME !== undefined) headers.set("Authorization", AUTHORIZERNAME)

const url = `${baseUrl.replace(/\/+$/, '')}/payout/spendback/${encodeURIComponent(String(args.user_token))}${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(spendBackTxnResp, await res.json())
};