var nodemailer = require('nodemailer');
var settings = require('./settings.js');
var template = require('./template.js');
var database = require('./database.js');

/**
 * Mail module
 */
module.exports = {
    transporter: null,
    /**
     * Load mail settings.
     */
    init: function() {
        this.transporter = nodemailer.createTransport(settings.smtp());

        this.transporter.verify(function(error, success) {
            if (error) {
                throw new Error(error);
            } else if (settings.app().debug) {
                console.log('SMTP connection stablished');
            }
        });
    },

    /**
     * Send email.
     * @param {Object} recipient - Mail destinatary
     * @param {String} subject - Subject
     * @param {String} body - Mail body
     * @param {Object} attachments - Mail attachments
     * @param {Object} params - Params
     * @param {Object} cb - Callback
     */
    send: function(recipient, subject, body, attachments, params, cb) {
        let mailOptions = {
            from: '"' + settings.app().senderName + '" <' + settings.app().senderMail + '>',
            to: recipient,
            subject: subject,
            html: body,
            attachments
        };

        if (settings.app().debug) {
            mailOptions.to = settings.testEmail;
        }

        this.transporter.sendMail(mailOptions, (error, info) => {
            let status = (error ? error.message : 'OK');
            this.log(params.sender, params.recipient, recipient, subject, body, params.message, status);

            if (error)
                return cb({status: 'REJECT', data: {message: 'Email not sent: ' + error}});

            if (settings.app().debug)
                console.log('Mail sent ' + info.messageId + ' [' + info.response + ']');

            cb({status: 'ACCEPT', data: {message: 'Email sent'}});
        });
    },

    /**
     * Send email with template.
     * @param {String} tplName - Template name
     * @param {Object} params - Params object
     * @param {Object} cb - Callback
     */
    sendWithTemplate: function(tplName, params, cb) {
        template.get(tplName, params, result => {
            if (result.status == 'REJECT')
                return cb(result);

            this.send(result.data.recipient, result.data.subject, result.data.body, result.data.attachments, params, result => {
                cb(result);
            });
        });
    },

    /**
     * Add mail log
     * @param {Integer} senderId - Sender id
     * @param {Integer} recipientId - Recipient id
     * @param {String} sender - Sender email
     * @param {String} subject - Mail subject
     * @param {String} body - Mail body
     * @param {String} plainTextBody - Mail plain text body
     * @param {String} status - Mail status
     */
    log: function(senderId, recipientId, sender, subject, body, plainTextBody, status) {
        let qry = `INSERT INTO mail(senderFk, recipientFk, sender, replyTo, subject, body, plainTextBody, sent, status) 
                    VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)`;
        let qryParams = [senderId, recipientId, sender, settings.app().senderMail, subject, body, plainTextBody, 1, status];

        database.pool.query(qry, qryParams, function(error, result) {
            if (settings.app().debug && error)
                console.log('Mail log: ' + error);
        });
    }
};