#!/usr/bin/env node
/**
 * 校验代码内的契约版本常量与 contracts/VERSION 一致。
 * 在构建前执行：不一致则退出码 1，阻止契约漂移。
 *
 * 用法：node scripts/check-contracts.mjs
 */
import { readFileSync } from 'node:fs';
import { dirname, join } from 'node:path';
import { fileURLToPath } from 'node:url';

const here = dirname(fileURLToPath(import.meta.url));
const versionFile = join(here, '..', '..', 'contracts', 'VERSION');
const constantFile = join(here, '..', 'src', 'config', 'contract-versions.ts');

function parseVersionFile(content) {
  const out = {};
  for (const rawLine of content.split(/\r?\n/)) {
    const line = rawLine.trim();
    if (!line || line.startsWith('#')) continue;
    const idx = line.indexOf(':');
    if (idx <= 0) continue;
    out[line.slice(0, idx).trim()] = line.slice(idx + 1).trim();
  }
  return out;
}

function parseConstants(content) {
  const block = /CONTRACT_VERSIONS[^=]*=\s*Object\.freeze\(\{([\s\S]*?)\}\)/.exec(content);
  if (!block) throw new Error('无法在 contract-versions.ts 中定位 CONTRACT_VERSIONS');
  const out = {};
  // 键可能是带引号的 'rest-api'，也可能是不带引号的 database
  for (const match of block[1].matchAll(/['"]?([\w-]+)['"]?\s*:\s*['"]([^'"]+)['"]/g)) {
    out[match[1]] = match[2];
  }
  return out;
}

let fileVersions;
let codeVersions;
try {
  fileVersions = parseVersionFile(readFileSync(versionFile, 'utf8'));
} catch (error) {
  console.error(`✗ 无法读取 ${versionFile}：${error.message}`);
  process.exit(1);
}
try {
  codeVersions = parseConstants(readFileSync(constantFile, 'utf8'));
} catch (error) {
  console.error(`✗ 无法解析 ${constantFile}：${error.message}`);
  process.exit(1);
}

const keys = new Set([...Object.keys(fileVersions), ...Object.keys(codeVersions)]);
const problems = [];
for (const key of [...keys].sort()) {
  const a = fileVersions[key];
  const b = codeVersions[key];
  if (a === undefined) problems.push(`  ${key}: 仅存在于代码常量（${b}）`);
  else if (b === undefined) problems.push(`  ${key}: 仅存在于 contracts/VERSION（${a}）`);
  else if (a !== b) problems.push(`  ${key}: contracts/VERSION=${a} vs 代码常量=${b}`);
}

if (problems.length > 0) {
  console.error('✗ 契约版本不一致：');
  console.error(problems.join('\n'));
  console.error('\n请同步 contracts/VERSION 与 web-server/src/config/contract-versions.ts');
  process.exit(1);
}

console.log(`✓ 契约版本一致（${Object.keys(fileVersions).length} 项）：${JSON.stringify(fileVersions)}`);