const {describe, test, expect, afterAll} = require('@jest/globals');
const nodemailer = require('../../Common/node_modules/nodemailer');

const operationContext = require('../../Common/sources/operationContext');
const mailService = require('../../Common/sources/mailService');

const ctx = new operationContext.Context();
const defaultTestSMTPServer = {
  host: 'smtp.ethereal.email',
  port: 587
};
const testTimeout = 1000 * 10;

afterAll(() => {
  mailService.transportersRelease();
});

describe('Mail service', () => {
  describe('SMTP', () => {
    const {host, port} = defaultTestSMTPServer;

    test(
      'Transporters life cycle',
      async () => {
        // Accounts created at https://ethereal.email/, all messages in tests goes here: https://ethereal.email/messages
        // Ethereial is a special SMTP sever for mailing tests in collaboration with Nodemailer.
        const accounts = await Promise.all([nodemailer.createTestAccount(), nodemailer.createTestAccount(), nodemailer.createTestAccount()]);
        const auth = accounts.map(account => {
          return {user: account.user, pass: account.pass};
        });
        auth.forEach(credential => mailService.createTransporter(ctx, host, port, credential, {from: 'some.mail@ethereal.com'}));

        for (let i = 0; i < auth.length; i++) {
          const credentials = auth[i];
          const mail = await mailService.send(host, credentials.user, {
            to: `some.recipient@server${i + 1}.com`,
            text: 'simple test text',
            subject: 'Mail service test'
          });

          expect(mail.envelope).toEqual({from: 'some.mail@ethereal.com', to: [`some.recipient@server${i + 1}.com`]});
        }

        const accountToBeDeleted = auth[1];
        mailService.deleteTransporter(ctx, host, accountToBeDeleted.user);

        const errorPromise = mailService.send(host, accountToBeDeleted.user, {
          to: 'no.recipient@server.com',
          text: 'simple test text',
          subject: 'Mail service test'
        });

        await expect(errorPromise).rejects.toThrow();
      },
      testTimeout
    );
  });
});