const nodemailer = require('nodemailer');
var fs = require('fs');
var handlebars = require('handlebars');
const path = require("path");
//const transport = fs.readFileSync(path.resolve(__dirname, './files/secret-email.key'), { encoding: 'utf-8' });

const transport = {
    host: 'sandbox.smtp.mailtrap.io',
    port: 587,
    secure: false, // true for 465, false for other ports
    auth: {
        user: '1fa2f34cd54db1',     // add user here
        pass: '17ce8c3ba5fd65'      // add password here
    }
}

async function readHTMLFile(path) {
    return fs.readFileSync(path, { encoding: 'utf-8' });
    ;
};

async function passwordEmail(from, to, replacements) {
    var subject = 'nodejs-simple-authentication: Recuperar a password';
    var receivers = to.replace(/\"/g, "");
    let transporter = nodemailer.createTransport(transport);
    var html = await readHTMLFile(__dirname + '/templates/template.html');
    var template = handlebars.compile(html);
    var htmlToSend = template(replacements);
    let info = await transporter.sendMail({
        from: from,
        to: receivers,
        subject: subject,
        html: htmlToSend
    });

    return info;
}

async function register(from, to, replacements) {
    var subject = 'nodejs-simple-authentication: registado com sucesso 🚀';
    var receivers = to.replace(/\"/g, "");
    let transporter = nodemailer.createTransport(transport);
    var html = await readHTMLFile(__dirname + '/templates/template-register.html');
    var template = handlebars.compile(html);
    var htmlToSend = template(replacements);
    let info = await transporter.sendMail({
        from: from,
        to: receivers,
        subject: subject,
        html: htmlToSend
    });

    return info;
}

async function emailOptions(mailOptions) {
    var subject = mailOptions.sub;
    var receivers = mailOptions.to.replace(/\"/g, "");
    let transporter = nodemailer.createTransport(transport);
    var html = await readHTMLFile(__dirname + '/templates/template-site.html');
    var template = handlebars.compile(html);
    var htmlToSend = template(mailOptions);
    let info = await transporter.sendMail({
        from: mailOptions.from,
        to: receivers,
        subject: subject,
        html: htmlToSend
    });

    return info;
}

module.exports = {
    passwordEmail,
    register,
    emailOptions
}