import { describe, expect, it } from 'vitest'
import { formatBytes } from '../src/lib/bytes'
import { secureRandomBytes, type RandomSource } from '../src/lib/random'

describe('secure random bytes', () => {
  it('uses the supplied cryptographic source and preserves requested length', () => {
    let next = 0
    const source: RandomSource = {
      getRandomValues<T extends ArrayBufferView>(array: T): T {
        const bytes = new Uint8Array(array.buffer, array.byteOffset, array.byteLength)
        bytes.forEach((_, index) => { bytes[index] = next; next += 1 })
        return array
      },
    }
    expect(secureRandomBytes(4, source)).toEqual(Uint8Array.from([0, 1, 2, 3]))
    expect(() => secureRandomBytes(0, source)).toThrow('1 至 65536')
  })

  it('formats the same bytes for OpenSSL and source-code styles', () => {
    const bytes = Uint8Array.from([0x0a, 0xbc, 0xff])
    expect(formatBytes(bytes)).toBe('0ABCFF')
    expect(formatBytes(bytes, { format: 'spaced-hex' })).toBe('0A BC FF')
    expect(formatBytes(bytes, { format: 'byte-array', uppercase: false })).toBe('0x0a, 0xbc, 0xff')
  })
})