/* jslint node: true */
'use strict';

//	ENiGMA½
const logger			= require('./logger.js');
const Events            = require('./events.js');

//	deps
const _					= require('lodash');
const moment			= require('moment');
const hashids			= require('hashids');

exports.getActiveConnections	= getActiveConnections;
exports.getActiveNodeList		= getActiveNodeList;
exports.addNewClient			= addNewClient;
exports.removeClient			= removeClient;
exports.getConnectionByUserId	= getConnectionByUserId;

const clientConnections = [];
exports.clientConnections		= clientConnections;

function getActiveConnections() { return clientConnections; }

function getActiveNodeList(authUsersOnly) {

    if(!_.isBoolean(authUsersOnly)) {
        authUsersOnly = true;
    }

    const now = moment();

    const activeConnections = getActiveConnections().filter(ac => {
        return ((authUsersOnly && ac.user.isAuthenticated()) || !authUsersOnly);
    });

    return _.map(activeConnections, ac => {
        const entry = {
            node			: ac.node,
            authenticated	: ac.user.isAuthenticated(),
            userId			: ac.user.userId,
            action			: _.has(ac, 'currentMenuModule.menuConfig.desc') ? ac.currentMenuModule.menuConfig.desc : 'Unknown',
        };

        //
        //	There may be a connection, but not a logged in user as of yet
        //
        if(ac.user.isAuthenticated()) {
            entry.userName	= ac.user.username;
            entry.realName	= ac.user.properties.real_name;
            entry.location	= ac.user.properties.location;
            entry.affils	= ac.user.properties.affiliation;

            const diff 		= now.diff(moment(ac.user.properties.last_login_timestamp), 'minutes');
            entry.timeOn	= moment.duration(diff, 'minutes');
        }
        return entry;
    });
}

function addNewClient(client, clientSock) {
    const id			= client.session.id		= clientConnections.push(client) - 1;
    const remoteAddress = client.remoteAddress	= clientSock.remoteAddress;

    //	create a uniqe identifier one-time ID for this session
    client.session.uniqueId = new hashids('ENiGMA½ClientSession').encode([ id, moment().valueOf() ]);

    //	Create a client specific logger
    //	Note that this will be updated @ login with additional information
    client.log = logger.log.child( { clientId : id, sessionId : client.session.uniqueId } );

    const connInfo = {
        remoteAddress	: remoteAddress,
        serverName		: client.session.serverName,
        isSecure		: client.session.isSecure,
    };

    if(client.log.debug()) {
        connInfo.port		= clientSock.localPort;
        connInfo.family		= clientSock.localFamily;
    }

    client.log.info(connInfo, 'Client connected');

    Events.emit(
        Events.getSystemEvents().ClientConnected,
        { client : client, connectionCount : clientConnections.length }
    );

    return id;
}

function removeClient(client) {
    client.end();

    const i = clientConnections.indexOf(client);
    if(i > -1) {
        clientConnections.splice(i, 1);

        logger.log.info(
            {
                connectionCount	: clientConnections.length,
                clientId		: client.session.id
            },
            'Client disconnected'
        );

        if(client.user && client.user.isValid()) {
            Events.emit(Events.getSystemEvents().UserLogoff, { user : client.user } );
        }

        Events.emit(
            Events.getSystemEvents().ClientDisconnected,
            { client : client, connectionCount : clientConnections.length }
        );
    }
}

function getConnectionByUserId(userId) {
    return getActiveConnections().find( ac => userId === ac.user.userId );
}