import {z} from 'zod'

export type EmploymentType = 'GLOBAL_PAYROLL';

export type GetApiV1EmployeesDynamicDetailsSchemaArgs = {employmentType: EmploymentType, entity?: string | undefined};

export type GetApiV1EmployeesDynamicDetailsSchemaOptions = {baseUrl?: string | undefined, BearerAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const fieldDefinition = z.object({key: z.string(), label: z.string().optional(), type: z.string(), required: z.boolean()});

export const employeeSchemaSection = z.object({required: z.boolean(), fields: z.array(fieldDefinition)});

export const v1GetEmployeeDynamicDetailsSchemaResponse = z.object({legalDetails: employeeSchemaSection, customFields: employeeSchemaSection});

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
};

/**
 * Get employee creation form schema
 * 
 * GET /v1/employees/dynamic-details/schema
 */
export const getApiV1EmployeesDynamicDetailsSchema = async (args: GetApiV1EmployeesDynamicDetailsSchemaArgs, options?: GetApiV1EmployeesDynamicDetailsSchemaOptions) => {
const {baseUrl = "https://api.usemultiplier.com", fetch: fetchFn = fetch, BearerAuth} = options ?? {}

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

if (args.employmentType != null) query.append("employmentType", String(args.employmentType))
if (args.entity != null) query.append("entity", String(args.entity))
if (BearerAuth !== undefined) headers.set('authorization', `Bearer ${BearerAuth}`)

const url = `${baseUrl.replace(/\/+$/, '')}/v1/employees/dynamic-details/schema${query.size > 0 ? `?${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(v1GetEmployeeDynamicDetailsSchemaResponse, await res.json())
};