// CI 侧 commit message 校验：Conventional Commits + feat 须带 Feature-Confirmed trailer。
// 与 lefthook commit-msg 同一套规则的服务端硬补偿——agent 沙箱（如 DSH workspace-write）
// 内 lefthook 会静默失效，本脚本保证机器校验层不缺位（dsh-takeover-readiness T2）。
// 环境变量：EVENT_NAME / BEFORE_SHA / BASE_SHA / HEAD_SHA（由 workflow 从 github context 注入）
import { execSync } from 'node:child_process';

const git = (cmd) => execSync(`git ${cmd}`, { encoding: 'utf8' }).trim();

const CONVENTIONAL =
  /^(feat|fix|docs|chore|refactor|ci|perf|style|test|build|revert)(\(.+\))?!?: .+/;
const ZERO_SHA = /^0+$/;

const { EVENT_NAME, BEFORE_SHA, BASE_SHA, HEAD_SHA } = process.env;

let range;
if (EVENT_NAME === 'pull_request' && BASE_SHA) {
  range = `${BASE_SHA}..${HEAD_SHA}`;
} else if (BEFORE_SHA && !ZERO_SHA.test(BEFORE_SHA)) {
  range = `${BEFORE_SHA}..${HEAD_SHA}`;
} else {
  // 新分支首推等场景拿不到 before：与 master 比对兜底，再退化为仅查 HEAD
  try {
    git('fetch origin master --quiet');
    range = `origin/master..${HEAD_SHA || 'HEAD'}`;
  } catch {
    range = `${HEAD_SHA || 'HEAD'} -1`;
  }
}

let shas;
try {
  shas = git(`rev-list --no-merges ${range}`).split('\n').filter(Boolean);
} catch {
  // force push 后旧 before 在 clone 里不存在等场景：退化为与 master 比对，再退化为仅查 HEAD
  try {
    git('fetch origin master --quiet');
    range = `origin/master..${HEAD_SHA || 'HEAD'}`;
    shas = git(`rev-list --no-merges ${range}`).split('\n').filter(Boolean);
  } catch {
    range = 'HEAD -1';
    shas = [git('rev-parse HEAD')];
  }
}
console.log(`commit message 校验：范围 ${range}，共 ${shas.length} 个 commit`);

const errors = [];
for (const sha of shas) {
  const subject = git(`log -1 --format=%s ${sha}`);
  if (!CONVENTIONAL.test(subject)) {
    errors.push(`${sha.slice(0, 8)} 首行不符合 Conventional Commits：${subject}`);
    continue;
  }
  if (/^feat/.test(subject)) {
    const body = git(`log -1 --format=%B ${sha}`);
    if (!body.includes('Feature-Confirmed: true')) {
      errors.push(`${sha.slice(0, 8)} feat 提交缺少 "Feature-Confirmed: true" trailer：${subject}`);
    }
  }
}

if (errors.length > 0) {
  console.error('\n❌ commit message 校验失败：');
  for (const e of errors) console.error(`   ${e}`);
  console.error('\n   规则：首行须为 <type>(<scope>): <subject>；feat 提交末尾须有 Feature-Confirmed: true');
  process.exit(1);
}
console.log('✅ commit message 校验通过');