import {z} from 'zod'

export type ISO3 = string;

export type Language = 'en' | 'fr' | 'es' | 'pt' | 'de' | 'it' | 'ja' | 'ko' | 'zh' | 'ru' | 'ar' | 'hi' | 'th' | 'vi' | 'tl';

export type GetApiApiX402VisaArgs = {passport: ISO3, destination: ISO3, lang?: Language | undefined};

export type GetApiApiX402VisaOptions = {baseUrl?: string | undefined, fetch?: typeof fetch | undefined};

export const getApiApiX402VisaResponse = z.object({});

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
};

/**
 * Full visa record, paid per request over x402 (no account, no API key)
 * 
 * GET /api/x402/visa
 */
export const getApiApiX402Visa = async (args: GetApiApiX402VisaArgs, options?: GetApiApiX402VisaOptions) => {
const {baseUrl = "https://visa.orizn.app", fetch: fetchFn = fetch} = options ?? {}

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

if (args.passport != null) query.append("passport", String(args.passport))
if (args.destination != null) query.append("destination", String(args.destination))
if (args.lang != null) query.append("lang", String(args.lang))

const url = `${baseUrl.replace(/\/+$/, '')}/api/x402/visa${query.size > 0 ? `?${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(getApiApiX402VisaResponse, await res.json())
};