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

//  ENiGMA½
const Config                    = require('./config.js').get;
const Log                       = require('./logger.js').log;
const {
    getMessageAreaByTag,
    getMessageConferenceByTag
}                               = require('./message_area.js');
const clientConnections         = require('./client_connections.js');
const StatLog                   = require('./stat_log.js');
const FileBaseFilters           = require('./file_base_filter.js');
const {
    formatByteSize,
}                               = require('./string_util.js');
const ANSI                      = require('./ansi_term.js');
const UserProps                 = require('./user_property.js');
const SysProps                  = require('./system_property.js');
const SysLogKeys                = require('./system_log.js');

//  deps
const packageJson           = require('../package.json');
const os                    = require('os');
const _                     = require('lodash');
const moment                = require('moment');
const async                 = require('async');

exports.getPredefinedMCIValue   = getPredefinedMCIValue;
exports.init                    = init;

function init(cb) {
    async.series(
        [
            (callback) => {
                return setNextRandomRumor(callback);
            },
            (callback) => {
                //  by fetching a memory or load we'll force a refresh now
                StatLog.getSystemStat(SysProps.SystemMemoryStats);
                return callback(null);
            }
        ],
        err => {
            return cb(err);
        }
    );
}

//  :TODO: move this to stat_log.js like system memory is handled
function setNextRandomRumor(cb) {
    StatLog.getSystemLogEntries(SysLogKeys.UserAddedRumorz, StatLog.Order.Random, 1, (err, entry) => {
        if(entry) {
            entry = entry[0];
        }
        const randRumor = entry && entry.log_value ? entry.log_value : '';
        StatLog.setNonPersistentSystemStat(SysProps.NextRandomRumor, randRumor);
        if(cb) {
            return cb(null);
        }
    });
}

function getUserRatio(client, propA, propB) {
    const a = StatLog.getUserStatNum(client.user, propA);
    const b = StatLog.getUserStatNum(client.user, propB);
    const ratio = ~~((a / b) * 100);
    return `${ratio}%`;
}

function userStatAsString(client, statName, defaultValue) {
    return (StatLog.getUserStat(client.user, statName) || defaultValue).toLocaleString();
}

function toNumberWithCommas(x) {
    return x.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ',');
}

function userStatAsCountString(client, statName, defaultValue) {
    const value = StatLog.getUserStatNum(client.user, statName) || defaultValue;
    return toNumberWithCommas(value);
}

const PREDEFINED_MCI_GENERATORS = {
    //
    //  Board
    //
    BN  : function boardName() { return Config().general.boardName; },

    //  ENiGMA
    VL  : function versionLabel() { return 'ENiGMA½ v' + packageJson.version; },
    VN  : function version() { return packageJson.version; },

    //  +op info
    SN  : function opUserName() { return StatLog.getSystemStat(SysProps.SysOpUsername); },
    SR  : function opRealName() { return StatLog.getSystemStat(SysProps.SysOpRealName); },
    SL  : function opLocation() { return StatLog.getSystemStat(SysProps.SysOpLocation); },
    SA  : function opAffils() { return StatLog.getSystemStat(SysProps.SysOpAffiliations); },
    SS  : function opSex() { return StatLog.getSystemStat(SysProps.SysOpSex); },
    SE  : function opEmail() { return StatLog.getSystemStat(SysProps.SysOpEmailAddress); },

    //
    //  Current user / session
    //
    UN  : function userName(client) { return client.user.username; },
    UI  : function userId(client) { return client.user.userId.toString(); },
    UG  : function groups(client) { return _.values(client.user.groups).join(', '); },
    UR  : function realName(client) { return userStatAsString(client, UserProps.RealName, ''); },
    LO  : function location(client) { return userStatAsString(client, UserProps.Location, ''); },
    UA  : function age(client) { return client.user.getAge().toString(); },
    BD  : function birthdate(client) {  //  iNiQUiTY
        return moment(client.user.properties[UserProps.Birthdate]).format(client.currentTheme.helpers.getDateFormat());
    },
    US  : function sex(client) { return userStatAsString(client, UserProps.Sex, ''); },
    UE  : function emailAddress(client) { return userStatAsString(client, UserProps.EmailAddress, ''); },
    UW  : function webAddress(client) { return userStatAsString(client, UserProps.WebAddress, ''); },
    UF  : function affils(client) { return userStatAsString(client, UserProps.Affiliations, ''); },
    UT  : function themeName(client) {
        return _.get(client, 'currentTheme.info.name', userStatAsString(client, UserProps.ThemeId, ''));
    },
    UD  : function themeId(client) { return userStatAsString(client, UserProps.ThemeId, ''); },
    UC  : function loginCount(client) { return userStatAsCountString(client, UserProps.LoginCount, 0); },
    ND  : function connectedNode(client) { return client.node.toString(); },
    IP  : function clientIpAddress(client) { return client.remoteAddress.replace(/^::ffff:/, ''); },    //  convert any :ffff: IPv4's to 32bit version
    ST  : function serverName(client) { return client.session.serverName; },
    FN  : function activeFileBaseFilterName(client) {
        const activeFilter = FileBaseFilters.getActiveFilter(client);
        return activeFilter ? activeFilter.name : '(Unknown)';
    },
    DN  : function userNumDownloads(client) { return userStatAsCountString(client, UserProps.FileDlTotalCount, 0); },      //  Obv/2
    DK  : function userByteDownload(client) {   //  Obv/2 uses DK=downloaded Kbytes
        const byteSize = StatLog.getUserStatNum(client.user, UserProps.FileDlTotalBytes);
        return formatByteSize(byteSize, true);  //  true=withAbbr
    },
    UP  : function userNumUploads(client) { return userStatAsCountString(client, UserProps.FileUlTotalCount, 0); },            //  Obv/2
    UK  : function userByteUpload(client) { //  Obv/2 uses UK=uploaded Kbytes
        const byteSize = StatLog.getUserStatNum(client.user, UserProps.FileUlTotalBytes);
        return formatByteSize(byteSize, true);  //  true=withAbbr
    },
    NR  : function userUpDownRatio(client) {    //  Obv/2
        return getUserRatio(client, UserProps.FileUlTotalCount, UserProps.FileDlTotalCount);
    },
    KR  : function userUpDownByteRatio(client) {    //  Obv/2 uses KR=upload/download Kbyte ratio
        return getUserRatio(client, UserProps.FileUlTotalBytes, UserProps.FileDlTotalBytes);
    },

    MS  : function accountCreated(client) {
        return moment(client.user.properties[UserProps.AccountCreated]).format(client.currentTheme.helpers.getDateFormat());
    },
    PS  : function userPostCount(client) { return userStatAsCountString(client, UserProps.MessagePostCount, 0); },
    PC  : function userPostCallRatio(client) { return getUserRatio(client, UserProps.MessagePostCount, UserProps.LoginCount); },

    MD  : function currentMenuDescription(client) {
        return _.has(client, 'currentMenuModule.menuConfig.desc') ? client.currentMenuModule.menuConfig.desc : '';
    },

    MA  : function messageAreaName(client) {
        const area = getMessageAreaByTag(client.user.properties[UserProps.MessageAreaTag]);
        return area ? area.name : '';
    },
    MC  : function messageConfName(client) {
        const conf = getMessageConferenceByTag(client.user.properties[UserProps.MessageConfTag]);
        return conf ? conf.name : '';
    },
    ML  : function messageAreaDescription(client) {
        const area = getMessageAreaByTag(client.user.properties[UserProps.MessageAreaTag]);
        return area ? area.desc : '';
    },
    CM  : function messageConfDescription(client) {
        const conf = getMessageConferenceByTag(client.user.properties[UserProps.MessageConfTag]);
        return conf ? conf.desc : '';
    },

    SH  : function termHeight(client) { return client.term.termHeight.toString(); },
    SW  : function termWidth(client) { return client.term.termWidth.toString(); },

    AC  : function achievementCount(client) { return userStatAsCountString(client, UserProps.AchievementTotalCount, 0); },
    AP  : function achievementPoints(client) { return userStatAsCountString(client, UserProps.AchievementTotalPoints, 0); },

    DR  : function doorRuns(client) { return userStatAsCountString(client, UserProps.DoorRunTotalCount, 0); },
    DM  : function doorFriendlyRunTime(client) {
        const minutes = client.user.properties[UserProps.DoorRunTotalMinutes] || 0;
        return moment.duration(minutes, 'minutes').humanize();
    },
    TO  : function friendlyTotalTimeOnSystem(client) {
        const minutes = client.user.properties[UserProps.MinutesOnlineTotalCount] || 0;
        return moment.duration(minutes, 'minutes').humanize();
    },
    NM  : function userNewMessagesAddressedToCount(client) {
        return StatLog.getUserStatNumByClient(client, UserProps.NewAddressedToMessageCount);
    },
    NP  : function userNewPrivateMailCount(client) {
        return StatLog.getUserStatNumByClient(client, UserProps.NewPrivateMailCount);
    },
    IA  : function userStatusAvailableIndicator(client) {
        const indicators = client.currentTheme.helpers.getStatusAvailIndicators();
        return client.user.isAvailable() ? (indicators[0] || 'Y') : (indicators[1] || 'N');
    },
    IV  : function userStatusVisibleIndicator(client) {
        const indicators = client.currentTheme.helpers.getStatusVisibleIndicators();
        return client.user.isVisible() ? (indicators[0] || 'Y') : (indicators[1] || 'N');
    },

    //
    //  Date/Time
    //
    DT  : function date(client) { return moment().format(client.currentTheme.helpers.getDateFormat()); },
    CT  : function time(client) { return moment().format(client.currentTheme.helpers.getTimeFormat()) ;},

    //
    //  OS/System Info
    //
    //  https://github.com/nodejs/node-v0.x-archive/issues/25769
    //
    OS  : function operatingSystem() {
        return {
            linux   : 'Linux',
            darwin  : 'OS X',
            win32   : 'Windows',
            sunos   : 'SunOS',
            freebsd : 'FreeBSD',
            android : 'Android',
            openbsd : 'OpenBSD',
            aix     : 'IBM AIX',
        }[os.platform()] || os.type();
    },

    OA  : function systemArchitecture() { return os.arch(); },

    SC  : function systemCpuModel() {
        //
        //  Clean up CPU strings a bit for better display
        //
        return os.cpus()[0].model
            .replace(/\(R\)|\(TM\)|processor|CPU/ig, '')
            .replace(/\s+(?= )/g, '')
            .trim();
    },

    MB  : function totalMemoryBytes() {
        const stats = StatLog.getSystemStat(SysProps.SystemMemoryStats) || { totalBytes : 0 };
        return formatByteSize(stats.totalBytes, true); //  true=withAbbr
    },
    MF  : function totalMemoryFreeBytes() {
        const stats = StatLog.getSystemStat(SysProps.SystemMemoryStats) || { freeBytes : 0 };
        return formatByteSize(stats.freeBytes, true);   //  true=withAbbr
    },
    LA  : function systemLoadAverage() {
        const stats = StatLog.getSystemStat(SysProps.SystemLoadStats) || { average : 0.0 };
        return stats.average.toLocaleString();
    },
    CL  : function systemCurrentLoad() {
        const stats = StatLog.getSystemStat(SysProps.SystemLoadStats) || { current : 0 };
        return `${stats.current}%`;
    },
    UU  : function systemUptime() {
        return moment.duration(process.uptime(), 'seconds').humanize();
    },
    NV  : function nodeVersion() { return process.version; },
    AN  : function activeNodes() { return clientConnections.getActiveConnections(clientConnections.UserVisibleConnections).length.toString(); },

    TC  : function totalCalls() { return StatLog.getSystemStat(SysProps.LoginCount).toLocaleString(); },
    TT  : function totalCallsToday() {
        return StatLog.getSystemStat(SysProps.LoginsToday).toLocaleString();
    },

    RR  : function randomRumor() {
        //  start the process of picking another random one
        setNextRandomRumor();

        return StatLog.getSystemStat('random_rumor');
    },

    //
    //  System File Base, Up/Download Info
    //
    SD  : function systemNumDownloads() { return StatLog.getFriendlySystemStat(SysProps.FileDlTotalCount, 0); },
    SO  : function systemByteDownload() {
        const byteSize = StatLog.getSystemStatNum(SysProps.FileDlTotalBytes);
        return formatByteSize(byteSize, true);  //  true=withAbbr
    },
    SU  : function systemNumUploads() { return StatLog.getFriendlySystemStat(SysProps.FileUlTotalCount, 0); },
    SP  : function systemByteUpload() {
        const byteSize = StatLog.getSystemStatNum(SysProps.FileUlTotalBytes);
        return formatByteSize(byteSize, true);  //  true=withAbbr
    },
    TF  : function totalFilesOnSystem() {
        const areaStats = StatLog.getSystemStat(SysProps.FileBaseAreaStats);
        return _.get(areaStats, 'totalFiles', 0).toLocaleString();
    },
    TB  : function totalBytesOnSystem() {
        const areaStats     = StatLog.getSystemStat(SysProps.FileBaseAreaStats);
        const totalBytes    = parseInt(_.get(areaStats, 'totalBytes', 0));
        return formatByteSize(totalBytes, true);    //  true=withAbbr
    },
    PT  : function messagesPostedToday() {  //  Obv/2
        return StatLog.getFriendlySystemStat(SysProps.MessagesToday, 0);
    },
    TP  : function totalMessagesOnSystem() {    //  Obv/2
        return StatLog.getFriendlySystemStat(SysProps.MessageTotalCount, 0);
    },
    FT  : function totalUploadsToday() {    //  Obv/2
        return StatLog.getFriendlySystemStat(SysProps.FileUlTodayCount, 0);
    },
    FB  : function totalUploadBytesToday() {
        const byteSize = StatLog.getSystemStatNum(SysProps.FileUlTodayBytes);
        return formatByteSize(byteSize, true);  //  true=withAbbr
    },
    DD  : function totalDownloadsToday() {  //  iNiQUiTY
        return StatLog.getFriendlySystemStat(SysProps.FileDlTodayCount, 0);
    },
    DB  : function totalDownloadBytesToday() {
        const byteSize = StatLog.getSystemStatNum(SysProps.FileDlTodayBytes);
        return formatByteSize(byteSize, true);  //  true=withAbbr
    },
    NT  : function totalNewUsersToday() {   // Obv/2
        return StatLog.getSystemStatNum(SysProps.NewUsersTodayCount);
    },

    //  :TODO: TZ - Average *system* post/call ratio (iNiQUiTY)
    //  :TODO: ?? - Total users on system

    TU  : function totalSystemUsers() {
        return StatLog.getSystemStatNum(SysProps.TotalUserCount) || 1;
    },

    LC  : function lastCallerUserName() {   //  Obv/2
        const lastLogin = StatLog.getSystemStat(SysProps.LastLogin) || {};
        return lastLogin.userName || 'N/A';
    },
    LD  : function lastCallerDate(client) {
        const lastLogin = StatLog.getSystemStat(SysProps.LastLogin) || {};
        if (!lastLogin.timestamp) {
            return 'N/A';
        }
        return lastLogin.timestamp.format(client.currentTheme.helpers.getDateFormat());
    },
    LT  : function lastCallerTime(client) {
        const lastLogin = StatLog.getSystemStat(SysProps.LastLogin) || {};
        if (!lastLogin.timestamp) {
            return 'N/A';
        }
        return lastLogin.timestamp.format(client.currentTheme.helpers.getTimeFormat());
    },

    //
    //  Special handling for XY
    //
    XY  : function xyHack() { return; /* nothing */ },

    //
    //  Various movement by N
    //
    CF  : function cursorForwardBy(client, n = 1) { return ANSI.forward(n); },
    CB  : function cursorBackBy(client, n = 1) { return ANSI.back(n); },
    CU  : function cursorUpBy(client, n = 1) { return ANSI.up(n); },
    CD  : function cursorDownBy(client, n = 1) { return ANSI.down(n); },
};

function getPredefinedMCIValue(client, code, extra) {

    if(!client || !code) {
        return;
    }

    const generator = PREDEFINED_MCI_GENERATORS[code];

    if(generator) {
        let value;
        try {
            value = generator(client, extra);
        } catch(e) {
            Log.error( { code : code, exception : e.message }, 'Exception caught generating predefined MCI value' );
        }

        return value;
    }
}