import _ from 'lodash'
import rek from 'rek'
import config from '../config.ts'

const headers = {
  authorization: `Basic ${Buffer.from(`api:${config.mailgun.key}`).toString('base64')}`,
  'content-type': 'application/x-www-form-urlencoded',
  accept: 'application/json',
}

interface SendMailOptions {
  from?: string
  to?: string
  replyTo?: string
  subject?: string
  html?: string
}

function mapKey(_value: ANY, key: string) {
  return key === 'replyTo' ? 'h:Reply-To' : key
}

const defaults: SendMailOptions = {
  from: `${config.site.title} Robot <${config.site.emails.robot}>`,
  to: config.site.emails.info,
  html: 'some html',
}

export default function sendMail(options: SendMailOptions): Promise<void> {
  return rek.post(
    config.mailgun.url,
    new URLSearchParams(
      Object.assign({}, defaults, 'replyTo' in options ? _.mapKeys(options, mapKey) : options) as Record<
        string,
        string
      >,
    ),
    {
      headers,
    },
  )
}