// 生成 CodeArts 华为云签名派生的差分期望值（供 internal/core/codearts_sign_test.go 比对）。
//
// 为什么需要：channels.lua 里的华为云 SDK-HMAC-SHA256 签名是**手工移植**
// （Lua 没有 webcrypto）。签名错一处，服务端只回一句
// `{"error_code":"APIG.0301","error_msg":"...verify ak sk signature fail"}`，
// 看起来像"账号/权限问题"，极难定位。所以拿参考实现生成期望值做逐字节差分。
//
// 参考真值：vendor/channel-pack/src/sign.ts 的 signRequestHuawei。
// 这里**逐行照抄**那个函数（而非 import）—— 它依赖参考仓库的构建链，
// 抄这 40 行更能保证"同一算法"。
//
// 用法（改了参考或改了移植后都要重跑）：
//   node tools/codearts_sig_expected.mjs > internal/core/codearts_sig_expected.json

import { createHash, createHmac } from 'node:crypto'

const sha256Hex = (d) => createHash('sha256').update(d).digest('hex')
const hmacSha256Hex = (key, data) => createHmac('sha256', key).update(data).digest('hex')

/** 照抄 sign.ts:signRequestHuawei（dateStamp 提为参数以便固定时间）。 */
function signRequestHuawei(ak, sk, securityToken, method, urlStr, body, dateStamp) {
  const url = new URL(urlStr)
  let uri = url.pathname
  if (!uri.endsWith('/')) uri += '/'
  const query = url.search.slice(1)
  const payloadHash = sha256Hex(body)

  const headers = new Map()
  headers.set('host', url.host)
  headers.set('x-sdk-date', dateStamp)
  headers.set('x-sdk-content-sha256', payloadHash)
  headers.set('x-security-token', securityToken)
  if (method.toUpperCase() !== 'GET') headers.set('content-type', 'application/json')

  const signedHeaders = []
  headers.forEach((_, k) => signedHeaders.push(k))
  signedHeaders.sort()
  const headerLines = signedHeaders.map((k) => `${k}:${headers.get(k) ?? ''}`)
  const canonical = [
    method,
    uri,
    query,
    headerLines.join('\n'),
    '',
    signedHeaders.join(';'),
    payloadHash,
  ].join('\n')
  const stringToSign = `SDK-HMAC-SHA256\n${dateStamp}\n${sha256Hex(new TextEncoder().encode(canonical))}`
  const signature = hmacSha256Hex(
    new TextEncoder().encode(sk),
    new TextEncoder().encode(stringToSign),
  )
  return {
    canonical,
    stringToSign,
    signature,
    signedHeaders: signedHeaders.join(';'),
  }
}

// 覆盖三条真实路径（账户查询 / 活动列表带 query / 领取带 body），
// 以及有/无 security_token 两种形态。
const cases = [
  {
    m: 'GET',
    u: 'https://snap-access.cn-north-4.myhuaweicloud.com/snap-manager/v1/statistics/plugin',
    b: '',
    ak: 'AK1',
    sk: 'SK1',
    st: 'TOK1',
  },
  {
    m: 'GET',
    u: 'https://snap-access.cn-north-4.myhuaweicloud.com/v1/ops/delivery?channel=IDE',
    b: '',
    ak: 'AK2',
    sk: 'SK2',
    st: '',
  },
  {
    m: 'POST',
    u: 'https://snap-access.cn-north-4.myhuaweicloud.com/v1/ops/claim',
    b: '{"campaignId":"C1","channel":"IDE"}',
    ak: 'AK3',
    sk: 'SK3',
    st: 'T3',
  },
]

const out = cases.map((c) => {
  const r = signRequestHuawei(
    c.ak,
    c.sk,
    c.st,
    c.m,
    c.u,
    Buffer.from(c.b, 'utf8'),
    '20261013T150405Z',
  )
  return {
    method: c.m,
    url: c.u,
    body: c.b,
    ak: c.ak,
    sk: c.sk,
    st: c.st,
    canonical: r.canonical,
    string_to_sign: r.stringToSign,
    signature: r.signature,
    signed_headers: r.signedHeaders,
  }
})
process.stdout.write(`${JSON.stringify(out, null, 1)}\n`)