var settings = require('./config');
var nodemailer = require('nodemailer');
var smtpPool = require('nodemailer-smtp-pool');

var transporter;

var Mailer = module.exports = {
	init: function() {

		return function(done) {

			if (settings.general.mailer.service == 'Gmail') {

				// Initializing XOAuth2
				var generator = require('xoauth2')
					.createXOAuth2Generator(settings.general.mailer.auth);

				// Create a pool of connections
				var pool = smtpPool({
					service: settings.general.mailer.service,
					auth: {
						xoauth2: generator
					}
				});

				// Create a transport
				transporter = nodemailer.createTransport(pool);

				done();
				return;
			}

			// Create a pool of connections for specific mail service
			var pool = smtpPool({
				service: settings.general.mailer.service,
				auth: settings.general.mailer.auth
			});

			// Create a transport
			transporter = nodemailer.createTransport(pool);

			done();
		};
	},
	sendMail: function(msg) {

		return function(done) {

			transporter.sendMail(msg, done);
		};
	},
	sendMailFromService: function(to, subject, html) {

		return Mailer.sendMail({
			from: settings.general.mailer.sender.name + ' <' + settings.general.mailer.sender.address + '>',
			to: to,
			subject: subject,
			html: html
		});
	}
};