import { afterEach, describe, expect, it, vi } from 'vitest'
import { createIdempotencyKey } from '../../src/idempotencyKey'

afterEach(() => vi.unstubAllGlobals())

describe('createIdempotencyKey', () => {
  it('prefers the native UUID implementation', () => {
    const randomUUID = vi.fn(() => 'native-uuid')
    vi.stubGlobal('crypto', { randomUUID, getRandomValues: vi.fn() })

    expect(createIdempotencyKey()).toBe('native-uuid')
    expect(randomUUID).toHaveBeenCalledOnce()
  })

  it('generates an RFC 4122 UUID v4 when randomUUID is unavailable', () => {
    vi.stubGlobal('crypto', { getRandomValues: (bytes: Uint8Array) => bytes.map((_, index) => index) })

    expect(createIdempotencyKey()).toBe('00010203-0405-4607-8809-0a0b0c0d0e0f')
  })

  it('fails explicitly when no secure random source exists', () => {
    vi.stubGlobal('crypto', {})

    expect(() => createIdempotencyKey()).toThrow('当前浏览器不支持安全随机数')
  })
})