/**
 * 邮件 SMTP 连接测试脚本
 * 测试 Gmail SMTP 465 端口连接和认证
 */
const nodemailer = require('nodemailer')
const path = require('path')

// 加载环境变量
const fs = require('fs')
const localCredsPath = path.join(process.env.USERPROFILE || 'C:\\Users\\Administrator', 'Toolbox_local_creds.env.local')
if (fs.existsSync(localCredsPath)) {
  fs.readFileSync(localCredsPath, 'utf-8')
    .split('\n')
    .filter(l => l.trim() && !l.startsWith('#'))
    .forEach(line => {
      const [key, ...valParts] = line.split('=')
      const val = valParts.join('=').trim().replace(/^["']|["']$/g, '')
      if (key && val) process.env[key.trim()] = val
    })
}

// 也加载项目根目录的 .env（如果存在）
const projectEnvPath = path.join(__dirname, '..', '..', '..', '..', '.env')
if (fs.existsSync(projectEnvPath)) {
  fs.readFileSync(projectEnvPath, 'utf-8')
    .split('\n')
    .filter(l => l.trim() && !l.startsWith('#'))
    .forEach(line => {
      const [key, ...valParts] = line.split('=')
      const val = valParts.join('=').trim().replace(/^["']|["']$/g, '')
      if (key && val) process.env[key.trim()] = val
    })
}

const smtpHost = process.env.EMAIL_SENDER_SMTP_HOST || 'smtp.gmail.com'
const smtpUser = process.env.EMAIL_SENDER_SMTP_USER || ''
const smtpPass = process.env.EMAIL_SENDER_SMTP_PASS || ''

console.log('=== Email Sender SMTP 连接测试 ===\n')
console.log(`SMTP Host: ${smtpHost}`)
console.log(`SMTP User: ${smtpUser || '(未配置)'}`)
console.log(`SMTP Pass: ${smtpPass ? smtpPass.substring(0, 4) + '****' + smtpPass.substring(smtpPass.length - 2) : '(未配置)'}`)
console.log(`\n`)

if (!smtpUser || !smtpPass) {
  console.error('❌ 错误: EMAIL_SENDER_SMTP_USER 或 EMAIL_SENDER_SMTP_PASS 未配置')
  console.error('请在 Toolbox_local_creds.env.local 中配置这两个环境变量')
  process.exit(1)
}

async function testPort(port, secure) {
  const mode = secure ? 'SSL (465)' : 'STARTTLS (587)'
  console.log(`\n--- 测试端口 ${port} (${mode}) ---\n`)

  // DNS
  console.log('[1/3] 测试 DNS 解析...')
  try {
    const dns = require('dns')
    const addresses = await dns.promises.resolve(smtpHost)
    console.log(`✅ ${smtpHost} -> ${addresses.join(', ')}\n`)
  } catch (e) {
    console.error(`❌ DNS 解析失败: ${e.message}\n`)
    return false
  }

  // TCP
  console.log(`[2/3] 测试 TCP 连接到 ${smtpHost}:${port}...`)
  const net = require('net')
  const tcpTimeout = new Promise((_, reject) => {
    setTimeout(() => reject(new Error('TCP 连接超时 (10s)')), 10000)
  })
  const tcpConnect = new Promise((resolve, reject) => {
    const socket = net.createConnection({ host: smtpHost, port })
    socket.on('connect', () => {
      socket.end()
      resolve()
    })
    socket.on('error', reject)
  })

  try {
    await Promise.race([tcpConnect, tcpTimeout])
    console.log(`✅ TCP 连接成功\n`)
  } catch (e) {
    console.error(`❌ TCP 连接失败: ${e.message}\n`)
    return false
  }

  // SMTP
  console.log('[3/3] 测试 SMTP 认证和发信...')
  const transporter = nodemailer.createTransport({
    host: smtpHost,
    port,
    secure,
    auth: { user: smtpUser, pass: smtpPass },
    connectionTimeout: 15000,
    socketTimeout: 30000,
    greetingTimeout: 15000
  })

  try {
    console.log('  → 验证 SMTP 连接...')
    await transporter.verify()
    console.log('  ✅ SMTP 验证成功\n')

    console.log('  → 尝试发送测试邮件...')
    const info = await transporter.sendMail({
      from: smtpUser,
      to: smtpUser,
      subject: 'TRAE-Toolbox SMTP 测试',
      text: `这是一封自动测试邮件\n发送时间: ${new Date().toISOString()}\n如果收到此邮件，说明 SMTP 配置正常。`
    })
    console.log(`  ✅ 邮件发送成功!`)
    console.log(`  Message ID: ${info.messageId}`)
    console.log(`  Response: ${info.response}`)
  } catch (e) {
    console.error(`❌ SMTP 操作失败: ${e.message}`)
    return false
  } finally {
    transporter.close()
  }

  return true
}

async function test() {
  // 先试 465 SSL
  const ok465 = await testPort(465, true)
  if (ok465) {
    console.log('\n=== 465 SSL 测试通过 ✅ ===')
    return
  }

  console.log('\n465 SSL 失败，尝试 587 STARTTLS...')

  // 再试 587 STARTTLS
  const ok587 = await testPort(587, false)
  if (ok587) {
    console.log('\n=== 587 STARTTLS 测试通过 ✅ ===')
    console.log('\n建议: 将 EMAIL_SENDER_SMTP_PORT 改为 587，EMAIL_SENDER_SMTP_SECURE 设为 false')
    return
  }

  console.log('\n=== 两个端口都失败了 ❌ ===')
  console.log('\n可能原因:')
  console.log('1. Gmail 限制了当前 IP 的 SMTP 访问')
  console.log('2. 企业防火墙/安全组阻断了 Gmail SMTP')
  console.log('3. 需要检查 Gmail 账号安全设置')
  process.exit(1)
}

test().catch(e => {
  console.error('未预期错误:', e)
  process.exit(1)
})