import {z} from 'zod'

export type GetApiPaymentMethodsArgs = {processing_channel_id: string};

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

export const paymentMethod = z.object({type: z.enum(["accel", "ach", "alipay_cn", "alipay_hk", "alipay_plus", "alma", "amex", "bancontact", "blik", "boost", "bpi", "card_scheme", "cartes_bancaires", "china_union_pay", "connect_wallet", "bacs", "dana", "dci", "diners", "discover", "eps", "gcash", "ideal", "jcb", "kakaopay", "klarna", "knet", "mada", "mastercard", "mbway", "multibanco", "nyce", "omannet", "p24", "paypal", "paypay", "pulse", "qpay", "rabbit_line_pay", "sepa", "sequra", "shazam", "star", "stcpay", "swish", "tamara", "tng", "truemoney", "upi", "visa", "wechatpay"]), partner_merchant_id: z.string().optional()});

export const paymentMethodsResponse = z.object({methods: z.array(paymentMethod)});

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
};

/**
 * Get available payment methods
 * 
 * GET /payment-methods
 * 
 * Also accepts auth: ApiSecretKey
 */
export const getApiPaymentMethods = async (args: GetApiPaymentMethodsArgs, options: GetApiPaymentMethodsOptions) => {
const {baseUrl, fetch: fetchFn = fetch, OAuth} = options ?? {}

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

if (args.processing_channel_id != null) query.append("processing_channel_id", String(args.processing_channel_id))
if (OAuth !== undefined) headers.set('authorization', `Bearer ${OAuth}`)

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