import { describe, it, expect } from 'vitest'
// @ts-ignore
import { buildA7Packets, concatA7PacketData } from '@/ble/core/packet'

describe('A7 packet 分片', () => {
  it('短 payload（≤18 字节）单包：包头 0xA7、总包数/序号打包进第 2 字节', () => {
    const data = new Uint8Array([1, 2, 3, 4, 5])
    const packets = buildA7Packets(data)
    expect(packets).toHaveLength(1)
    expect(packets[0][0]).toBe(0xa7)
    // 总包数 1 高 4 位、序号 1 低 4 位 → 0x11
    expect(packets[0][1]).toBe((1 << 4) | 1)
    expect(Array.from(packets[0].slice(2))).toEqual([1, 2, 3, 4, 5])
  })

  it('长 payload（50 字节）按 chunkSize=18 分 3 包，序号递增', () => {
    const data = new Uint8Array(50)
    for (let i = 0; i < 50; i++) data[i] = i
    const packets = buildA7Packets(data)
    expect(packets).toHaveLength(3)
    expect(packets[0][1]).toBe((3 << 4) | 1)
    expect(packets[1][1]).toBe((3 << 4) | 2)
    expect(packets[2][1]).toBe((3 << 4) | 3)
  })

  it('超出 maxChunk=15*18=270 字节时抛错', () => {
    expect(() => buildA7Packets(new Uint8Array(271))).toThrow()
  })

  it('concatA7PacketData 按 A7 规则重组分包还原原始 payload', () => {
    const data = new Uint8Array(40)
    for (let i = 0; i < 40; i++) data[i] = (i * 7) % 256
    const packets = buildA7Packets(data)
    const restored = concatA7PacketData(packets)
    expect(Array.from(restored)).toEqual(Array.from(data))
  })
})