'use strict'
const nodemailer = require('nodemailer')

const SMTP_HOST = process.env.SMTP_HOST || ''
const SMTP_PORT = parseInt(process.env.SMTP_PORT || '587', 10)
const SMTP_USER = process.env.SMTP_USER || ''
const SMTP_PASS = process.env.SMTP_PASS || ''
const APP_URL   = (process.env.APP_URL || 'http://localhost:3001').replace(/\/$/, '')
const FROM_ADDR = SMTP_USER
  ? `"MorseQuest" <${SMTP_USER}>`
  : '"MorseQuest" <noreply@morsequest.keylinkit.net>'

let transport = null
if (SMTP_HOST && SMTP_USER && SMTP_PASS) {
  transport = nodemailer.createTransport({
    host: SMTP_HOST,
    port: SMTP_PORT,
    secure: SMTP_PORT === 465,
    auth: { user: SMTP_USER, pass: SMTP_PASS },
  })
  console.log(`[mailer] SMTP configured: ${SMTP_HOST}:${SMTP_PORT}`)
} else {
  console.warn('[mailer] SMTP not configured — magic links will be logged only')
}

async function send(to, subject, html) {
  if (!transport) {
    console.log(`[mailer] Would send to ${to}: ${subject}`)
    return
  }
  await transport.sendMail({ from: FROM_ADDR, to, subject, html })
}

async function sendMagicLink(email, token) {
  const link = `${APP_URL}/api/auth/verify?token=${token}`
  const subject = 'Your MorseQuest Login Link'
  const html = `
    <div style="font-family:'Open Sans',sans-serif;max-width:480px;margin:0 auto;
                padding:2rem;background:#F5E6D3;border:2px solid #D4AF37">
      <h1 style="font-family:'Cinzel',serif;color:#3C2415;font-size:1.4rem;margin-bottom:1rem">
        &#x26A1; MorseQuest Login
      </h1>
      <p style="color:#3C2415;line-height:1.6">
        Click the button below to log in to MorseQuest. This link is valid for 24 hours
        and can only be used once.
      </p>
      <div style="text-align:center;margin:2rem 0">
        <a href="${link}"
           style="display:inline-block;padding:0.8rem 2rem;background:#D4AF37;
                  color:#3C2415;text-decoration:none;font-family:'Cinzel',serif;
                  font-size:1rem;font-weight:600;border:2px solid #3C2415">
          Begin Your Quest &rsaquo;
        </a>
      </div>
      <p style="color:#654321;font-size:0.85rem;line-height:1.5">
        If you didn't request this link, you can ignore this email safely.
      </p>
    </div>`
  await send(email, subject, html)
}

module.exports = { sendMagicLink }