export const SUPPORTED_LOCALES = ["en", "es"] as const

export type Locale = (typeof SUPPORTED_LOCALES)[number]

export const FALLBACK_LOCALE: Locale = "en"
export const DEFAULT_LOCALE_ENV_VAR = "STOCK_MANAGER_DEFAULT_LOCALE"
export const LOCALE_COOKIE_NAME = "stock-manager-locale"

export function isLocale(value: unknown): value is Locale {
  return (
    typeof value === "string" && SUPPORTED_LOCALES.includes(value as Locale)
  )
}

export function resolveDefaultLocale(value: unknown): Locale {
  return isLocale(value) ? value : FALLBACK_LOCALE
}

export function resolveLocale(value: unknown, fallback: Locale): Locale {
  return isLocale(value) ? value : fallback
}