/* istanbul ignore file */
'use strict'
const debug = require( 'debug' )( 'speckle' )

const nodemailer = require( 'nodemailer' )
const modulesDebug = debug.extend( 'modules' )
const errorDebug = debug.extend( 'errors' )

let transporter

const initTestSmtpTransporter = async () => {
  const account = await nodemailer.createTestAccount()
  return nodemailer.createTransport( {
    'host': 'smtp.ethereal.email',
    'port': 587,
    'secure': false,
    'auth': {
      'user': account.user,
      'pass': account.pass,
    },
  } )
}

const createJsonEchoTransporter = () => nodemailer.createTransport( {
  'jsonTransport': true,
} )

const initSmtpTransporter = async () => {
  try {
    const smtpTransporter = nodemailer.createTransport( {
      'host': process.env.EMAIL_HOST,
      'port': process.env.EMAIL_PORT || 587,
      'secure': process.env.EMAIL_SECURE === 'true',
      'auth': {
        'user': process.env.EMAIL_USERNAME,
        'pass': process.env.EMAIL_PASSWORD,
      },
    } )
    await smtpTransporter.verify()
    return smtpTransporter
  } catch {
    errorDebug( '📧 Email provider is misconfigured, check config variables.' )
  }
}

const initTransporter = async () => {
  if ( process.env.NODE_ENV === 'test' ) return createJsonEchoTransporter()
  // if (process.env.NODE_ENV === 'test') return await initTestSmtpTransporter()
  if ( process.env.EMAIL === 'true' ) return await initSmtpTransporter()

  modulesDebug(
    '📧 Email provider is not configured. Server functionality will be limited.',
  )
}

exports.init = async ( app, __ ) => {
  modulesDebug( '📧 Init emails module' )
  transporter = await initTransporter()
  require( './rest' )( app )
}

exports.finalize = async () => {
  // Nothing to do here.
}

exports.sendEmail = async ( { from, to, subject, text, html } ) => {
  // note, the transporter is only initialized with the app init step
  if ( !transporter ) {
    errorDebug( 'No email transport present. Cannot send emails.' )
    return false
  }
  try {
    const emailFrom = process.env.EMAIL_FROM || 'no-reply@speckle.systems'
    return await transporter.sendMail( {
      'from': from || `"Speckle" <${emailFrom}>`,
      to,
      subject,
      text,
      html,
    } )
  } catch ( error ) {
    errorDebug( error )
  }
}