import {z} from 'zod'

export type CountryId = 'DE' | 'AT' | 'CH';

export type GetApiBankcodesArgs = {bank_code?: string | undefined, country_id?: CountryId | undefined, bic?: string | undefined, per_page?: number | undefined, page?: number | undefined, q?: string | undefined};

export type GetApiBankcodesOptions = {baseUrl?: string | undefined, basicAuth?: {username: string, password: string} | undefined, fetch?: typeof fetch | undefined};

export const countryId = z.enum(["DE", "AT", "CH"]);

export const product = z.enum(["xs2a_verify", "xs2a_risk", "xs2a_pay", "xs2a_api"]);

export const bankObject = z.object({bank_code: z.string().optional(), bic: z.string().optional(), name: z.string().optional(), short_name: z.string().optional(), zipcode: z.string().optional(), city: z.string().optional(), country_id: countryId.optional(), testmode: z.string().optional(), xs2a_products: z.array(product).optional(), xs2a_supported: z.boolean().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
};

/**
 * Check if a bank is supported by xs2a
 * 
 * GET /bankcodes
 */
export const getApiBankcodes = async (args: GetApiBankcodesArgs, options?: GetApiBankcodesOptions) => {
const {baseUrl = "https://api.xs2a.com/v1", fetch: fetchFn = fetch, basicAuth} = options ?? {}

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

if (args.bank_code != null) query.append("bank_code", String(args.bank_code))
if (args.country_id != null) query.append("country_id", String(args.country_id))
if (args.bic != null) query.append("bic", String(args.bic))
if (args.per_page != null) query.append("per_page", String(args.per_page))
if (args.page != null) query.append("page", String(args.page))
if (args.q != null) query.append("q", String(args.q))
if (basicAuth !== undefined) headers.set('authorization', `Basic ${btoa(`${basicAuth.username}:${basicAuth.password}`)}`)

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