import { createRequestId } from '@/utils/request-id'

describe('request ID generation', () => {
  it('uses the browser native UUID when available', () => {
    const randomUUID = jest.fn(() => 'native-request-id')

    expect(createRequestId({ randomUUID })).toBe('native-request-id')
    expect(randomUUID).toHaveBeenCalledTimes(1)
  })

  it('formats secure random bytes as an RFC 4122 version 4 UUID', () => {
    const getRandomValues = jest.fn(bytes => {
      bytes.fill(0xff)
      return bytes
    })

    expect(createRequestId({ getRandomValues })).toBe('ffffffff-ffff-4fff-bfff-ffffffffffff')
    expect(getRandomValues).toHaveBeenCalledTimes(1)
  })

  it('supports public HTTP contexts without Web Crypto', () => {
    jest.spyOn(Math, 'random').mockReturnValue(0)

    expect(createRequestId(null)).toBe('00000000-0000-4000-8000-000000000000')

    Math.random.mockRestore()
  })
})