import { describe, expect, it } from "vitest"

import {
  DEFAULT_LOCALE_ENV_VAR,
  FALLBACK_LOCALE,
  isLocale,
  LOCALE_COOKIE_MAX_AGE_SECONDS,
  LOCALE_COOKIE_NAME,
  resolveDefaultLocale,
  resolveLocale,
  SUPPORTED_LOCALES,
} from "@/i18n/locales"

describe("i18n locales", () => {
  it("defines exactly English and Spanish with an env-configured default", () => {
    expect(SUPPORTED_LOCALES).toEqual(["en", "es"])
    expect(FALLBACK_LOCALE).toBe("en")
    expect(DEFAULT_LOCALE_ENV_VAR).toBe("STOCK_MANAGER_DEFAULT_LOCALE")
    expect(LOCALE_COOKIE_NAME).toBe("stock-manager-locale")
    expect(LOCALE_COOKIE_MAX_AGE_SECONDS).toBe(60 * 60 * 24 * 365)
  })

  it("accepts only exact supported locale codes", () => {
    expect(isLocale("en")).toBe(true)
    expect(isLocale("es")).toBe(true)

    for (const value of ["", "ES", "es-MX", "fr", undefined, null, 1]) {
      expect(isLocale(value)).toBe(false)
    }
  })

  it("resolves valid locale cookie values and falls back to the configured default for invalid values", () => {
    expect(resolveLocale("es", "en")).toBe("es")
    expect(resolveLocale("en", "es")).toBe("en")

    for (const value of ["", "ES", "es-MX", "fr", undefined, null, 1]) {
      expect(resolveLocale(value, "es")).toBe("es")
      expect(resolveLocale(value, "en")).toBe("en")
    }
  })

  it("resolves the configured default locale from env-like values with a safe English fallback", () => {
    expect(resolveDefaultLocale("es")).toBe("es")
    expect(resolveDefaultLocale("en")).toBe("en")

    for (const value of ["", "ES", "es-MX", "fr", undefined, null, 1]) {
      expect(resolveDefaultLocale(value)).toBe("en")
    }
  })
})