import {z} from 'zod'

export type GetApiV1InvoicesInvoicePeriodArgs = {'X-Gusto-API-Version'?: '2026-06-15' | undefined, invoice_period: string, page?: number | undefined, per?: number | undefined, company_uuids?: string | undefined};

export type GetApiV1InvoicesInvoicePeriodOptions = {baseUrl?: string | undefined, SystemAccessAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const invoiceData = z.object({active_companies: z.array(z.object({company_uuid: z.string().optional(), active_employees: z.number().int().optional(), active_contractors: z.number().int().optional(), initial_invoice_period: 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 invoicing data for companies
 * 
 * GET /v1/invoices/{invoice_period}
 */
export const getApiV1InvoicesInvoicePeriod = async (args: GetApiV1InvoicesInvoicePeriodArgs, options?: GetApiV1InvoicesInvoicePeriodOptions) => {
const {baseUrl = "https://api.gusto-demo.com", fetch: fetchFn = fetch, SystemAccessAuth} = options ?? {}

const query = new URLSearchParams()
const headers = new Headers()
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 (args.page != null) query.append("page", String(args.page))
if (args.per != null) query.append("per", String(args.per))
if (args.company_uuids != null) query.append("company_uuids", String(args.company_uuids))
if (SystemAccessAuth !== undefined) headers.set('authorization', `Bearer ${SystemAccessAuth}`)

const url = `${baseUrl.replace(/\/+$/, '')}/v1/invoices/${encodeURIComponent(String(args.invoice_period))}${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(invoiceData, await res.json())
};