/**
 * FreeSWITCH API.
 * @file: freeswitch-listener/apis/freeswitch.js
 */

const ESL = require('modesl');

const FreeswitchConfig = require('../config/config.js').getConfig('freeswitch');

const Event = {
    Connection: {
        READY: 'esl::ready',
        CLOSED: 'esl::end',
        ERROR: 'error',
    },
    RECEIVED: 'esl::event::*::*',
};
const ALL_EVENTS = 'all';
const DTMF_EVENTS = 'DTMF';
let connection = null;

const connect = () => new Promise((resolve, reject) => {
    if (connection !== null && connection.connected()) {
        resolve(connection);
    } else {
        // Opening new FreeSWITCH event socket connection...
        connection = new ESL.Connection(FreeswitchConfig.ip, FreeswitchConfig.port, FreeswitchConfig.password);
        connection.on(Event.Connection.ERROR, () => {
            // Error connecting to FreeSWITCH!
            reject('Connection error');
        });
        connection.on(Event.Connection.CLOSED, () => {
            // Connection to FreeSWITCH closed!
            reject('Connection closed');
        });
        connection.on(Event.Connection.READY, () => {
            // Connection to FreeSWITCH established!
            resolve(connection);
        });
    }
});

exports.ALL_EVENTS = ALL_EVENTS;
exports.DTMF_EVENTS = DTMF_EVENTS;
exports.Event = Event;
exports.connect = connect;