parseEmailData.ts

import { EmailData } from '@suin/email-data'
import { AddressObject, simpleParser } from 'mailparser'

export const parseEmailData = (emailRawString: string): Promise<EmailData> =>
  new Promise<EmailData>((resolve, reject) =>
    simpleParser(emailRawString, {}, (err, parsed) =>
      err
        ? reject(err)
        : resolve({
            messageId: parsed.messageId,
            to: toAddressList(parsed.to),
            replyTo: toAddressList(parsed.replyTo),
            from: toAddressList(parsed.from),
            cc: toAddressList(parsed.cc),
            subject: parsed.subject,
            bodyText: parsed.text || undefined,
            bodyHtml: parsed.html || undefined,
            date: parsed.date?.toISOString(),
            source: emailRawString,
          }),
    ),
  )

const toAddressList = (addressObject?: AddressObject): EmailData['to'] =>
  addressObject?.value.map(({ name, address }) => ({ name, address })) ?? []