import test from 'ava';
import { Readable } from 'stream';
import { simpleParser } from 'mailparser';
import { SMTPServer } from 'smtp-server';

import { client as c, message as m } from '../email';

type UnPromisify<T> = T extends Promise<infer U> ? U : T;

const port = 2526;
const client = new c.Client({ port, user: 'pooh', password: 'honey', ssl: true })
const smtp = new SMTPServer({ secure: true, authMethods: ['LOGIN'] });

const send = (message: m.Message, verify: (mail: UnPromisify<ReturnType<typeof simpleParser>>) => void) => {
	process.env.NODE_TLS_REJECT_UNAUTHORIZED = '0'; // prevent CERT_HAS_EXPIRED errors

	smtp.onData = (stream: Readable, _session, callback: () => void) => {
		simpleParser(stream).then(verify);
		stream.on('end', callback);
	};
	client.send(message, err => {
		if (err) {
			throw err;
		}
	});
};

test.before(() => {
	smtp.listen(port, function() {
		smtp.onAuth = function(auth, _session, callback) {
			if (auth.username == 'pooh' && auth.password == 'honey') {
				callback(null, { user: 'pooh' });
			} else {
				return callback(new Error('invalid user / pass'));
			}
		};
	});
});

test.after(() => smtp.close());

test.cb('authorize plain', t => {
	const msg = {
		subject: 'this is a test TEXT message from emailjs',
		from: 'piglet@gmail.com',
		to: 'pooh@gmail.com',
		text: "It is hard to be brave when you're only a Very Small Animal.",
	};

	send(new m.Message(msg), mail => {
		t.is(mail.text, msg.text + '\n\n\n');
		t.is(mail.subject, msg.subject);
		t.is(mail.from?.text, msg.from);
		t.is(mail.to?.text, msg.to);
		t.end();
	});
});