import {z} from 'zod'

export type GetApiTestFraudPreventionHeadersValidateArgs = {Accept: string, Authorization: string, 'Gov-*': string};

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

export const getApiTestFraudPreventionHeadersValidateResponse = z.object({specVersion: z.string(), message: z.string(), errors: z.array(z.object({code: z.union([z.literal("INVALID_HEADER"), z.literal("INVALID_HEADERS"), z.literal("MISSING_HEADER"), z.literal("EMPTY_HEADER")]), message: z.string(), headers: z.array(z.string())})).optional(), warnings: z.array(z.object({code: z.union([z.literal("POTENTIALLY_INVALID_HEADER"), z.literal("UNEXPECTED_HEADER")]), message: z.string(), headers: z.array(z.string())})).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
};

/**
 * Validate fraud prevention headers
 * 
 * GET /test/fraud-prevention-headers/validate
 */
export const getApiTestFraudPreventionHeadersValidate = async (args: GetApiTestFraudPreventionHeadersValidateArgs, options?: GetApiTestFraudPreventionHeadersValidateOptions) => {
const {baseUrl = "https://test-api.service.hmrc.gov.uk", fetch: fetchFn = fetch, applicationRestricted} = options ?? {}

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

if (args.Accept != null) headers.set("Accept", String(args.Accept))
if (args.Authorization != null) headers.set("Authorization", String(args.Authorization))
if (args['Gov-*'] != null) headers.set("Gov-*", String(args['Gov-*']))
if (applicationRestricted !== undefined) headers.set('authorization', `Bearer ${applicationRestricted}`)

const url = `${baseUrl.replace(/\/+$/, '')}/test/fraud-prevention-headers/validate${query.size > 0 ? `?${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(getApiTestFraudPreventionHeadersValidateResponse, await res.json())
};