#!/usr/bin/env node
/**
 * Map local test domains -> 127.0.0.1 for dev (macOS hosts + per-domain resolver).
 *
 * Usage:
 *   sudo node scripts/setup-local-test-dns.mjs
 *   sudo node scripts/setup-local-test-dns.mjs --remove
 */
import fs from 'node:fs';
import path from 'node:path';
import { execSync } from 'node:child_process';
import { DNS_MARKER, DNS_PORT, LOCAL_IP, TEST_HOSTS } from './local-test-config.mjs';

const remove = process.argv.includes('--remove');
const hostsPath = '/etc/hosts';
const resolverDir = '/etc/resolver';
const resolverBody = `nameserver 127.0.0.1\nport ${DNS_PORT}\n# ${DNS_MARKER}\n`;

function flushDnsCache() {
  try {
    execSync('dscacheutil -flushcache', { stdio: 'ignore' });
    execSync('killall -HUP mDNSResponder', { stdio: 'ignore' });
  } catch {
    // best effort
  }
}

function hostLine(host) {
  return `${LOCAL_IP} ${host} # ${DNS_MARKER}`;
}

function removeHostLines(lines, host) {
  return lines.filter(
    (line) =>
      !line.includes(DNS_MARKER) &&
      !new RegExp(`\\s${host.replace('.', '\\.')}(\\s|$)`).test(line),
  );
}

function hostReady(lines, host) {
  return lines.some(
    (line) =>
      (line.includes(DNS_MARKER) && line.includes(host)) ||
      new RegExp(`\\s${host.replace('.', '\\.')}(\\s|$)`).test(line),
  );
}

if (remove) {
  if (process.getuid?.() !== 0) {
    console.log('需要 root 权限，请执行：');
    console.log(`  sudo node ${process.argv[1]} --remove`);
    process.exit(1);
  }

  let lines = fs.readFileSync(hostsPath, 'utf8').split('\n');
  for (const host of TEST_HOSTS) {
    lines = removeHostLines(lines, host);
    try {
      if (fs.existsSync(path.join(resolverDir, host))) fs.unlinkSync(path.join(resolverDir, host));
    } catch {
      // ignore
    }
  }
  execSync(`tee ${hostsPath}`, {
    input: `${lines.join('\n').replace(/\n?$/, '\n')}`,
    stdio: ['pipe', 'inherit', 'inherit'],
  });
  flushDnsCache();
  console.log(`已移除本地测试域名：${TEST_HOSTS.join(', ')}`);
  process.exit(0);
}

const currentLines = fs.readFileSync(hostsPath, 'utf8').split('\n');
const allReady = TEST_HOSTS.every((host) => {
  const resolverPath = path.join(resolverDir, host);
  const resolverReady =
    fs.existsSync(resolverPath) && fs.readFileSync(resolverPath, 'utf8').trim() === resolverBody.trim();
  return hostReady(currentLines, host) && resolverReady;
});

if (allReady) {
  console.log(`本地测试域名已配置：${TEST_HOSTS.join(', ')}`);
  process.exit(0);
}

if (process.getuid?.() !== 0) {
  console.log('需要 root 权限写入 /etc/hosts 和 /etc/resolver，请执行：');
  console.log(`  sudo pnpm setup:local-dns`);
  process.exit(1);
}

let lines = currentLines;
for (const host of TEST_HOSTS) {
  if (!hostReady(lines, host)) {
    lines = lines.filter((line) => !line.includes(DNS_MARKER) || !line.includes(host));
    lines.push(hostLine(host));
    console.log(`已添加 hosts：${hostLine(host)}`);
  } else {
    console.log(`${host} 已在 /etc/hosts 中指向 ${LOCAL_IP}`);
  }
}

execSync(`tee ${hostsPath}`, {
  input: `${lines.join('\n').replace(/\n?$/, '\n')}`,
  stdio: ['pipe', 'inherit', 'inherit'],
});

fs.mkdirSync(resolverDir, { recursive: true });
for (const host of TEST_HOSTS) {
  const resolverPath = path.join(resolverDir, host);
  fs.writeFileSync(resolverPath, resolverBody, 'utf8');
  console.log(`已添加 resolver：${resolverPath} -> 127.0.0.1:${DNS_PORT}`);
}

flushDnsCache();
console.log('');
console.log('下一步：');
console.log('  sudo pnpm setup:local-tls     # 生成本地 HTTPS 证书');
console.log('  pnpm dev                      # 启动全栈');
console.log('  sudo pnpm dev:local-proxy     # HTTPS :443 统一入口');