import {z} from 'zod'

export type UpdateApiV1EmployeesEmployeeUuidFederalTaxesArgs = {'X-Gusto-API-Version'?: '2026-06-15' | undefined, employee_uuid: string, body: {version: string, w4_data_type: 'rev_2020_w4', filing_status: 'Single' | 'Married' | 'Head of Household' | 'Exempt from withholding', two_jobs?: boolean | undefined, dependents_amount?: number | undefined, other_income?: number | undefined, deductions?: number | undefined, extra_withholding?: number | undefined, federal_withholding_allowance?: number | undefined, additional_withholding?: number | undefined}};

export type UpdateApiV1EmployeesEmployeeUuidFederalTaxesOptions = {baseUrl?: string | undefined, CompanyAccessAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const employeeFederalTax = z.discriminatedUnion("w4_data_type", [z.object({version: z.string(), employee_uuid: z.string().optional(), employee_id: z.number().int().optional(), company_id: z.number().int().optional(), w4_data_type: z.literal("pre_2020_w4"), filing_status: z.string().nullable().optional(), federal_withholding_allowance: z.number().nullable().optional(), additional_withholding: z.string()}), z.object({version: z.string(), employee_uuid: z.string().optional(), employee_id: z.number().int().optional(), company_id: z.number().int().optional(), w4_data_type: z.literal("rev_2020_w4"), filing_status: z.string().nullable(), extra_withholding: z.string().nullable(), two_jobs: z.boolean().nullable(), dependents_amount: z.string().nullable(), other_income: z.string().nullable(), deductions: z.string().nullable()})]);

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
};

/**
 * Update federal taxes for an employee
 * 
 * PUT /v1/employees/{employee_uuid}/federal_taxes
 */
export const updateApiV1EmployeesEmployeeUuidFederalTaxes = async (args: UpdateApiV1EmployeesEmployeeUuidFederalTaxesArgs, options?: UpdateApiV1EmployeesEmployeeUuidFederalTaxesOptions) => {
const {baseUrl = "https://api.gusto-demo.com", fetch: fetchFn = fetch, CompanyAccessAuth} = options ?? {}

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

if (args['X-Gusto-API-Version'] != null) headers.set("X-Gusto-API-Version", String(args['X-Gusto-API-Version']))
if (CompanyAccessAuth !== undefined) headers.set('authorization', `Bearer ${CompanyAccessAuth}`)

const url = `${baseUrl.replace(/\/+$/, '')}/v1/employees/${encodeURIComponent(String(args.employee_uuid))}/federal_taxes${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "PUT", headers, body: JSON.stringify(args.body)})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(employeeFederalTax, await res.json())
};