#!/usr/bin/env node
/**
 * 校验 ts-rs 生成的共享契约绑定与 Rust 声明一致。
 *
 * 做法是「重新生成一遍并与工作区现有内容逐字节比较」：只比 git diff 会漏掉「Rust 改了但
 * 生成文件没重新跑」以外的情形，也很容易被本地未提交改动掩盖；比较生成前后快照更直接——
 * 只要重新生成后的内容与现有内容不同，就说明仓库里的绑定是陈旧的。
 */
import { spawnSync } from 'node:child_process';
import fs from 'node:fs';
import path from 'node:path';
import { fileURLToPath } from 'node:url';

const repoRoot = path.resolve(
  path.dirname(fileURLToPath(import.meta.url)),
  '..',
);
const generatedDir = path.join(
  repoRoot,
  'packages/shared/src/contracts/generated',
);

function snapshot() {
  if (!fs.existsSync(generatedDir)) return new Map();
  return new Map(
    fs
      .readdirSync(generatedDir, { withFileTypes: true })
      .filter((entry) => entry.isFile())
      .map((entry) => [
        entry.name,
        fs.readFileSync(path.join(generatedDir, entry.name)),
      ]),
  );
}

const before = snapshot();
const result = spawnSync(
  'cargo',
  [
    'test',
    '--locked',
    '-p',
    'shared-contracts',
    '--features',
    'ts-bindings',
    '--manifest-path',
    'server-rs/Cargo.toml',
    'export_bindings',
  ],
  { cwd: repoRoot, encoding: 'utf8' },
);
if (result.status !== 0) {
  console.error('生成绑定校验无法运行：export_bindings 未通过');
  if (result.stdout) console.error(result.stdout.trim());
  if (result.stderr) console.error(result.stderr.trim());
  process.exit(result.status ?? 1);
}
const after = snapshot();

const problems = [];
for (const [name, content] of after) {
  const previous = before.get(name);
  if (!previous) problems.push(`新增 ${name}`);
  else if (!previous.equals(content)) problems.push(`内容变化 ${name}`);
}
for (const name of before.keys()) {
  if (!after.has(name)) problems.push(`删除 ${name}`);
}

if (problems.length > 0) {
  console.error('生成绑定与 Rust 声明不一致：');
  for (const problem of problems) console.error(`  - ${problem}`);
  console.error(
    '请运行 `cargo test -p shared-contracts --features ts-bindings export_bindings`，并把重新生成的结果与 Rust 改动一并提交。',
  );
  process.exit(1);
}

console.log(
  `生成绑定校验通过：${after.size} 个文件与 Rust 声明一致（${path.relative(repoRoot, generatedDir)}）。`,
);