import { createServerFn } from "@tanstack/react-start"

import { isAppLocale } from "@/i18n/app-locales"
import { readAppLocale, writeAppLocale } from "./app-locale.server"

export const getAppLocale = createServerFn({ method: "GET" }).handler(() => {
  return readAppLocale()
})

export const setAppLocale = createServerFn({ method: "POST" })
  .validator((value: unknown) => {
    if (!isAppLocale(value)) {
      throw new Error("Invalid app locale")
    }

    return value
  })
  .handler(({ data }) => {
    writeAppLocale(data)
  })