var JitsiConference = require("./JitsiConference");
var XMPP = require("./modules/xmpp/xmpp");
var RandomUtil = require("./modules/util/RandomUtil");

/**
 * Utility method that generates user name based on random hex values.
 * Eg. 12345678-1234-1234-12345678
 * @returns {string}
 */
function generateUserName() {
    return RandomUtil.random8digitsHex() + "-" + RandomUtil.random4digitsHex() + "-" +
        RandomUtil.random4digitsHex() + "-" + RandomUtil.random8digitsHex();
}

/**
 * Creates new connection object for the Jitsi Meet server side video conferencing service. Provides access to the
 * JitsiConference interface.
 * @param appID identification for the provider of Jitsi Meet video conferencing services.
 * @param tokenPassword secret generated by the provider of Jitsi Meet video conferencing services.
 * The token will be send to the provider from the Jitsi Meet server deployment for authorization of the current client.
 * The format is:
 * passwordToken = token + "_" + roomName + "_" + ts
 * See doc/tokens.md for more info on how tokens are generated.
 * @param options Object with properties / settings related to connection with the server.
 * @constructor
 */
function JitsiConnection(appID, tokenPassword, options) {
    this.appID = appID;
    this.tokenPassword = tokenPassword;
    this.options = options;
    this.xmpp = new XMPP(options);
    this.conferences = {};
}

/**
 * Connect the client with the server.
 * @param options {object} connecting options (for example authentications parameters).
 */
JitsiConnection.prototype.connect = function (options) {
    if(!options)
        options = {};

    // If we have token provided use it as a password and generate random username
    if (this.tokenPassword) {
        options.password = this.tokenPassword;
        if (!options.id) {
            options.id = generateUserName() + "@" + this.options.hosts.domain;
        }
    }

    this.xmpp.connect(options.id, options.password);
}

/**
 * Disconnect the client from the server.
 */
JitsiConnection.prototype.disconnect = function () {
    this.xmpp.disconnect();
}

/**
 * This method allows renewal of the tokens if they are expiring.
 * @param token the new token.
 */
JitsiConnection.prototype.setToken = function (token) {
    this.token = token;
}

/**
 * Creates and joins new conference.
 * @param name the name of the conference; if null - a generated name will be provided from the api
 * @param options Object with properties / settings related to the conference that will be created.
 * @returns {JitsiConference} returns the new conference object.
 */
JitsiConnection.prototype.initJitsiConference = function (name, options) {
    this.conferences[name] = new JitsiConference({name: name, config: options, connection: this});
    return this.conferences[name];
}

/**
 * Subscribes the passed listener to the event.
 * @param event {JitsiConnectionEvents} the connection event.
 * @param listener {Function} the function that will receive the event
 */
JitsiConnection.prototype.addEventListener = function (event, listener) {
    this.xmpp.addListener(event, listener);
}

/**
 * Unsubscribes the passed handler.
 * @param event {JitsiConnectionEvents} the connection event.
 * @param listener {Function} the function that will receive the event
 */
JitsiConnection.prototype.removeEventListener = function (event, listener) {
    this.xmpp.removeListener(event, listener);
}

module.exports = JitsiConnection;