import {z} from 'zod'

export type GetApiV1CompaniesCompanyIdPaySchedulesPreviewArgs = {'X-Gusto-API-Version'?: '2026-06-15' | undefined, company_id: string, frequency: 'Every week' | 'Every other week' | 'Twice per month' | 'Monthly', anchor_pay_date: string, anchor_end_of_pay_period: string, day_1?: number | undefined, day_2?: number | undefined, first_pay_period_pay_day?: number | undefined, second_pay_period_pay_day?: number | undefined, first_pay_period_end_day?: number | undefined, second_pay_period_end_day?: number | undefined, end_date?: string | undefined, pay_schedule_uuid?: string | undefined};

export type GetApiV1CompaniesCompanyIdPaySchedulesPreviewOptions = {baseUrl?: string | undefined, CompanyAccessAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const paySchedulePreviewPayPeriod = z.object({check_date: z.string(), start_date: z.string(), run_payroll_by: z.string(), end_date: z.string()});

export const paySchedulePreview = z.object({pay_periods: z.array(paySchedulePreviewPayPeriod).optional(), holidays: 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
};

/**
 * Preview pay schedule dates
 * 
 * GET /v1/companies/{company_id}/pay_schedules/preview
 */
export const getApiV1CompaniesCompanyIdPaySchedulesPreview = async (args: GetApiV1CompaniesCompanyIdPaySchedulesPreviewArgs, options?: GetApiV1CompaniesCompanyIdPaySchedulesPreviewOptions) => {
const {baseUrl = "https://api.gusto-demo.com", fetch: fetchFn = fetch, CompanyAccessAuth} = 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.frequency != null) query.append("frequency", String(args.frequency))
if (args.anchor_pay_date != null) query.append("anchor_pay_date", String(args.anchor_pay_date))
if (args.anchor_end_of_pay_period != null) query.append("anchor_end_of_pay_period", String(args.anchor_end_of_pay_period))
if (args.day_1 != null) query.append("day_1", String(args.day_1))
if (args.day_2 != null) query.append("day_2", String(args.day_2))
if (args.first_pay_period_pay_day != null) query.append("first_pay_period_pay_day", String(args.first_pay_period_pay_day))
if (args.second_pay_period_pay_day != null) query.append("second_pay_period_pay_day", String(args.second_pay_period_pay_day))
if (args.first_pay_period_end_day != null) query.append("first_pay_period_end_day", String(args.first_pay_period_end_day))
if (args.second_pay_period_end_day != null) query.append("second_pay_period_end_day", String(args.second_pay_period_end_day))
if (args.end_date != null) query.append("end_date", String(args.end_date))
if (args.pay_schedule_uuid != null) query.append("pay_schedule_uuid", String(args.pay_schedule_uuid))
if (CompanyAccessAuth !== undefined) headers.set('authorization', `Bearer ${CompanyAccessAuth}`)

const url = `${baseUrl.replace(/\/+$/, '')}/v1/companies/${encodeURIComponent(String(args.company_id))}/pay_schedules/preview${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(paySchedulePreview, await res.json())
};