import {z} from 'zod'

export type TransferType = 'commission' | 'promotion' | 'refund';

export type TransferSource = {id?: string | undefined, amount?: number | undefined, currency?: unknown | undefined};

export type TransferDestination = {id?: string | undefined};

export type CreateTransferRequest = {reference?: string | undefined, transfer_type: TransferType, source: TransferSource, destination: TransferDestination};

export type CreateApiTransfersArgs = {'Cko-Idempotency-Key': string, body: CreateTransferRequest};

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

export const transferStatus = z.enum(["pending", "completed", "rejected"]);

export const transferLink = z.object({href: z.string().optional()});

export const createTransferResponse = z.object({id: z.string().optional(), status: transferStatus.optional(), _links: z.object({self: transferLink.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
};

/**
 * Initiate a transfer of funds
 * 
 * POST /transfers
 * 
 * Also accepts auth: ApiSecretKey
 */
export const createApiTransfers = async (args: CreateApiTransfersArgs, options: CreateApiTransfersOptions) => {
const {baseUrl, fetch: fetchFn = fetch, OAuth} = options ?? {}

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

if (args['Cko-Idempotency-Key'] != null) headers.set("Cko-Idempotency-Key", String(args['Cko-Idempotency-Key']))
if (OAuth !== undefined) headers.set('authorization', `Bearer ${OAuth}`)

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