const nodemailer = require('nodemailer')
    , smtpTransport = require('nodemailer-smtp-transport')
    , fs = require('fs')

var smtpConfig = {
    host: 'SSL0.OVH.NET',
    port: 465,
    secure: true, // use SSL
    auth: {
        user: 'ne-pas-repondre@x-one-france.com',
        pass: 'FGJGTHNckulcvepo5523'
    }
};

//var transporter = nodemailer.createTransport('smtps://x.on.france%40gmail.com:MICHOmifroid@smtp.gmail.com')
var transporter = nodemailer.createTransport(smtpConfig)
class Mailer {

    constructor(mailTemplateLink, mailListLink) {
        this.initConfig()
        .then((config) => {
            this.senderUserName = config.senderUserName
            this.senderUserMail = config.senderUserMail
            this.mailSubject = config.mailSubject
            this.initMailTemplate(mailTemplateLink)
            .then((mailTemplate) => {
                this.mailTemplate = mailTemplate
                this.initMailList(mailListLink)
                .then((mailList) => {
                    this.mailList = mailList
                    this.loop()
                })
            })
        })
    }

    initConfig() {
        return new Promise((resolve, reject) => {
            fs.readFile('config/config.json', {encoding: 'utf-8'}, (err, data) => {
                if (!err) {
                    var parsedData = JSON.parse(data)
                    console.log('Configuration loaded')
                    resolve(parsedData)
                } else {
                    console.log(err)
                    reject()
                }
            })
        })
    }

    initMailTemplate(mailTemplateLink) {
        return new Promise((resolve, reject) => {
            fs.readFile(mailTemplateLink, {encoding: 'utf-8'}, (err, data) => {
                if (!err) {
                    console.log('Mail template loaded')
                    resolve(data)
                } else {
                    console.log(err)
                    reject()
                }
            })
        })
    }

    initMailList(mailListLink) {
        return new Promise((resolve, reject) => {
            fs.readFile(mailListLink, {encoding: 'utf-8'}, (err, data) => {
                if (!err) {
                    var list = data.replace(/\s/g, " ").replace(/\s+/g, " ").split(" ").filter(function(e) { return e !== '' })
                    console.log('Mail list loaded')
                    resolve(list)
                } else {
                    console.log(err)
                    reject()
                }
            })
        })
    }

    loop() {
        for (let i = 0; i < this.mailList.length; i++) {
            this.sendTo(this.mailList[i])
        }
        console.log('All mails have been sent')
    }

    sendTo(address) {
        var mailOptions = {
            from: '"' + this.senderUserName + '" ' + '<' + this.senderUserMail + '>',
            to: address,
            subject: this.mailSubject,
            html: this.mailTemplate
        }
        transporter.sendMail(mailOptions, (error, info) => {
            if (error) {
                return console.log(error)
            }
            console.log('Message sent: ' + info.response)
        })
    }

}

/*
** ENTRY POINT
*/

if (process.argv.length !== 4) {
    console.log('Usage : node index.js mail.html mail_list.txt')
    process.exit(0)
} else {
    new Mailer(process.argv[2], process.argv[3])
}