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

import { LOCALE_COOKIE_MAX_AGE_SECONDS } from "@/i18n/locales"

const headersMocks = vi.hoisted(() => ({
  cookieSet: vi.fn(),
  cookies: vi.fn(),
}))

vi.mock("next/headers", () => ({
  cookies: headersMocks.cookies,
}))

import { setLocaleAction } from "@/actions/i18n.actions"

describe("setLocaleAction", () => {
  beforeEach(() => {
    headersMocks.cookieSet.mockReset()
    headersMocks.cookies.mockReset()
    headersMocks.cookies.mockResolvedValue({
      set: headersMocks.cookieSet,
    })
  })

  it("writes a validated supported locale to the locale cookie", async () => {
    const result = await setLocaleAction("es")

    expect(result).toEqual({ success: true, locale: "es" })
    expect(headersMocks.cookies).toHaveBeenCalledOnce()
    expect(headersMocks.cookieSet).toHaveBeenCalledWith(
      "stock-manager-locale",
      "es",
      {
        path: "/",
        sameSite: "lax",
        maxAge: LOCALE_COOKIE_MAX_AGE_SECONDS,
        httpOnly: true,
        secure: false,
      },
    )
  })

  it("rejects unsupported locales without writing a cookie", async () => {
    const result = await setLocaleAction("fr")

    expect(result).toEqual({ success: false, error: "UNSUPPORTED_LOCALE" })
    expect(headersMocks.cookies).not.toHaveBeenCalled()
    expect(headersMocks.cookieSet).not.toHaveBeenCalled()
  })
})