import Email from 'email-templates'
import path from 'path'
import nodemailer from 'nodemailer'

import config from '../../scripts/load-config'

const templateDir = path.join(__dirname, '../../', 'templates')
const email = new Email({
  message: {
    from: config.email.admin
  },
  views: {
    root: path.resolve(templateDir)
  },
  send: true
})

// Send an email to `email` with `headers`
async function sendMail (address, template, context) {
  if (!email.transport) throw new Error('No transporter present!')

  return email.send({
    template,
    locals: context,
    message: {
      to: address
    }
  })
}

// Send an email to `email` using `template` rendered with variables from `context`
async function pushMail (template, address, context) {
  console.debug('Mail being sent: %s to %s', template, email)

  return sendMail(address, template, context)
}

// Transporter initialization
async function init () {
  if (!config.email || config.email.enabled === false) return
  const transporter = nodemailer.createTransport(config.email.transport)

  console.debug('Setting up mail transporter')

  try {
    await transporter.verify()
    email.config.transport = transporter
    email.transport = transporter
    console.debug('Mail transporter initialized')
  } catch (e) {
    console.error('Email server verification failed')
    console.error(e)
  }
}

module.exports = {
  sendMail: sendMail,
  pushMail: pushMail,
  init: init
}