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

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

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

exports.getActiveConnections    = getActiveConnections;
exports.getActiveConnectionList = getActiveConnectionList;
exports.addNewClient            = addNewClient;
exports.removeClient            = removeClient;
exports.getConnectionByUserId   = getConnectionByUserId;
exports.getConnectionByNodeId   = getConnectionByNodeId;

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

function getActiveConnections(authUsersOnly = false) {
    return clientConnections.filter(conn => {
        return ((authUsersOnly && conn.user.isAuthenticated()) || !authUsersOnly);
    });
}

function getActiveConnectionList(authUsersOnly) {

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

    const now = moment();

    return _.map(getActiveConnections(authUsersOnly), ac => {
        const entry = {
            node            : ac.node,
            authenticated   : ac.user.isAuthenticated(),
            userId          : ac.user.userId,
            action          : _.get(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[UserProps.RealName];
            entry.location  = ac.user.properties[UserProps.Location];
            entry.affils    = entry.affiliation = ac.user.properties[UserProps.Affiliations];

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

function addNewClient(client, clientSock) {
    //
    //  Find a node ID "slot"
    //
    let nodeId;
    for (nodeId = 1; nodeId < Number.MAX_SAFE_INTEGER; ++nodeId) {
        const existing = clientConnections.find(client => nodeId === client.node);
        if (!existing) {
            break;  //  available slot
        }
    }

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

    clientConnections.push(client);
    clientConnections.sort( (c1, c2) => c1.session.id - c2.session.id);

    //  Create a client specific logger
    //  Note that this will be updated @ login with additional information
    client.log = logger.log.child( { nodeId, 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 nodeId;
}

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

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

        logger.log.info(
            {
                connectionCount : clientConnections.length,
                nodeId          : client.node,
            },
            'Client disconnected'
        );

        if(client.user && client.user.isValid()) {
            const minutesOnline = moment().diff(moment(client.user.properties[UserProps.LastLoginTs]), 'minutes');
            Events.emit(Events.getSystemEvents().UserLogoff, { user : client.user, minutesOnline } );
        }

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

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

function getConnectionByNodeId(nodeId) {
    return getActiveConnections().find( ac => nodeId == ac.node );
}