import {z} from 'zod'

export type PayScheduleAssignmentBody = {type: 'single' | 'hourly_salaried' | 'by_employee' | 'by_department' | null, hourly_pay_schedule_uuid?: string | undefined, salaried_pay_schedule_uuid?: string | undefined, default_pay_schedule_uuid?: string | undefined, partial_assignment?: boolean | undefined, employees?: (Array<{employee_uuid?: string | undefined, pay_schedule_uuid?: string | undefined}>) | undefined, departments?: (Array<{department_uuid?: string | undefined, pay_schedule_uuid?: string | undefined}>) | undefined};

export type CreateApiV1CompaniesCompanyIdPaySchedulesAssignmentPreviewArgs = {'X-Gusto-API-Version'?: '2026-06-15' | undefined, company_id: string, body: PayScheduleAssignmentBody};

export type CreateApiV1CompaniesCompanyIdPaySchedulesAssignmentPreviewOptions = {baseUrl?: string | undefined, CompanyAccessAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const payScheduleAssignmentPayPeriod = z.object({pay_schedule_uuid: z.string().optional(), start_date: z.string().optional(), end_date: z.string().optional(), check_date: z.string().optional()});

export const payScheduleAssignmentTransitionPayPeriod = z.object({start_date: z.string().optional(), end_date: z.string().optional()});

export const payScheduleAssignmentEmployeeChange = z.object({employee_uuid: z.string().optional(), first_name: z.string().optional(), last_name: z.string().optional(), pay_frequency: z.string().optional(), first_pay_period: payScheduleAssignmentPayPeriod.optional(), transition_pay_period: payScheduleAssignmentTransitionPayPeriod.optional()});

export const payScheduleAssignmentPreview = z.object({type: z.enum(["single", "hourly_salaried", "by_employee", "by_department"]).nullable().optional(), employee_changes: z.array(payScheduleAssignmentEmployeeChange).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 assignments for a company
 * 
 * POST /v1/companies/{company_id}/pay_schedules/assignment_preview
 */
export const createApiV1CompaniesCompanyIdPaySchedulesAssignmentPreview = async (args: CreateApiV1CompaniesCompanyIdPaySchedulesAssignmentPreviewArgs, options?: CreateApiV1CompaniesCompanyIdPaySchedulesAssignmentPreviewOptions) => {
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/companies/${encodeURIComponent(String(args.company_id))}/pay_schedules/assignment_preview${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "POST", 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(payScheduleAssignmentPreview, await res.json())
};