#!/usr/bin/env node
/**
 * 契约快照门禁 —— 编码规范 §11.5。
 *
 * tsc --emitDeclarationOnly 出全量 .d.ts,只留**契约面**落 api-report/:
 *   - packages/contracts/**        (前后端唯一共享点,§8.1)
 *   - packages/<pkg>/src/index.d.ts
 *   - apps/api/src/modules/<m>/{index,contract,port}.d.ts
 * 然后与 git 比对:改 internal/ 时 api-report/ 纹丝不动;碰了公开契约,diff 立刻可见。
 */
import { execFileSync } from 'node:child_process';
import { cpSync, existsSync, mkdirSync, readdirSync, rmSync, statSync } from 'node:fs';
import { dirname, join, relative, sep } from 'node:path';
import { fileURLToPath } from 'node:url';

const root = dirname(dirname(fileURLToPath(import.meta.url)));
const tmp = join(root, '.api-tmp');
const out = join(root, 'api-report');

function run(cmd, args, opts = {}) {
  return execFileSync(cmd, args, { cwd: root, encoding: 'utf8', stdio: 'pipe', ...opts });
}

rmSync(tmp, { recursive: true, force: true });

try {
  run('node', [
    join(root, 'node_modules', 'typescript', 'bin', 'tsc'),
    '-p',
    'tsconfig.node.json',
    '--emitDeclarationOnly',
    '--declaration',
    '--noEmit',
    'false',
    '--outDir',
    '.api-tmp',
  ]);
} catch (err) {
  process.stderr.write((err.stdout ?? '') + (err.stderr ?? ''));
  process.stderr.write('\napi:check —— 声明生成失败,先修 tsc。\n');
  process.exit(1);
}

/** 契约面判据:相对 .api-tmp 的路径 */
function isContractFace(rel) {
  const p = rel.split(sep).join('/');
  if (p.startsWith('packages/contracts/')) return true;
  if (/^packages\/[^/]+\/src\/index\.d\.ts$/.test(p)) return true;
  if (/^apps\/api\/src\/modules\/[^/]+\/(index|contract|port)\.d\.ts$/.test(p)) return true;
  return false;
}

function walk(dir, acc = []) {
  if (!existsSync(dir)) return acc;
  for (const name of readdirSync(dir)) {
    const full = join(dir, name);
    if (statSync(full).isDirectory()) walk(full, acc);
    else if (full.endsWith('.d.ts')) acc.push(full);
  }
  return acc;
}

rmSync(out, { recursive: true, force: true });
mkdirSync(out, { recursive: true });

let kept = 0;
for (const file of walk(tmp)) {
  const rel = relative(tmp, file);
  if (!isContractFace(rel)) continue;
  const dest = join(out, rel);
  mkdirSync(dirname(dest), { recursive: true });
  cpSync(file, dest);
  kept += 1;
}
rmSync(tmp, { recursive: true, force: true });

process.stdout.write(`api:check —— 契约面 ${kept} 个声明文件 → api-report/\n`);

if (process.argv.includes('--update')) {
  process.stdout.write('api:check —— --update:已刷新快照,请连同变更申请一并提交。\n');
  process.exit(0);
}

let status = '';
try {
  status = run('git', ['status', '--porcelain', '--', 'api-report']);
} catch {
  process.stdout.write('api:check —— 非 git 仓库,跳过比对。\n');
  process.exit(0);
}

if (status.trim() === '') {
  process.stdout.write('api:check —— 公开契约无变化 ✔\n');
  process.exit(0);
}

process.stderr.write('\napi:check —— 公开契约发生变化(§12.4):\n' + status + '\n');
try {
  process.stderr.write(run('git', ['diff', '--', 'api-report']));
} catch {
  /* 首次建立基线时无 diff 可打 */
}
process.stderr.write(
  '\n契约变更须:①depcruise 反查下游 ②同步 CONTRACT.md ③本快照单独说明 ④破坏性走三步弃用。\n' +
    '确认无误后:pnpm api:check --update && git add api-report\n',
);
process.exit(1);