import {z} from 'zod'

export type GetApiOrganisationsVatVrnInformationArgs = {vrn: string, 'Gov-Test-Scenario'?: string | undefined};

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

export const getApiOrganisationsVatVrnInformationResponse = z.object({customerDetails: z.object({effectiveRegistrationDate: z.string().optional()}).optional(), flatRateScheme: z.object({frsCategory: z.enum(["001", "002", "003", "004", "005", "006", "007", "008", "009", "010", "011", "012", "013", "014", "015", "016", "017", "018", "019", "020", "021", "022", "023", "024", "025", "026", "027", "028", "029", "030", "031", "032", "033", "034", "035", "036", "037", "038", "039", "040", "041", "042", "043", "044", "045", "046", "047", "048", "049", "050", "051", "052", "053", "054", "055", "999"]).optional(), startDate: z.string().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
};

/**
 * Retrieve VAT customer information
 * 
 * GET /organisations/vat/{vrn}/information
 */
export const getApiOrganisationsVatVrnInformation = async (args: GetApiOrganisationsVatVrnInformationArgs, options?: GetApiOrganisationsVatVrnInformationOptions) => {
const {baseUrl = "https://test-api.service.hmrc.gov.uk", fetch: fetchFn = fetch, userRestricted} = options ?? {}

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

if (args['Gov-Test-Scenario'] != null) headers.set("Gov-Test-Scenario", String(args['Gov-Test-Scenario']))
if (userRestricted !== undefined) headers.set('authorization', `Bearer ${userRestricted}`)

const url = `${baseUrl.replace(/\/+$/, '')}/organisations/vat/${encodeURIComponent(String(args.vrn))}/information${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(getApiOrganisationsVatVrnInformationResponse, await res.json())
};