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

//  ENiGMA½
const MenuModule        = require('./menu_module.js').MenuModule;
const ViewController    = require('./view_controller.js').ViewController;
const StatLog           = require('./stat_log.js');
const User              = require('./user.js');
const stringFormat      = require('./string_format.js');

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

/*
    Available listFormat object members:
    userId
    userName
    location
    affiliation
    ts

*/

exports.moduleInfo = {
    name        : 'Last Callers',
    desc        : 'Last callers to the system',
    author      : 'NuSkooler',
    packageName : 'codes.l33t.enigma.lastcallers'
};

const MciCodeIds = {
    CallerList      : 1,
};

exports.getModule = class LastCallersModule extends MenuModule {
    constructor(options) {
        super(options);
    }

    mciReady(mciData, cb) {
        super.mciReady(mciData, err => {
            if(err) {
                return cb(err);
            }

            const self      = this;
            const vc        = self.viewControllers.allViews = new ViewController( { client : self.client } );

            let loginHistory;
            let callersView;

            async.series(
                [
                    function loadFromConfig(callback) {
                        const loadOpts = {
                            callingMenu     : self,
                            mciMap          : mciData.menu,
                            noInput         : true,
                        };

                        vc.loadFromMenuConfig(loadOpts, callback);
                    },
                    function fetchHistory(callback) {
                        callersView = vc.getView(MciCodeIds.CallerList);

                        //  fetch up
                        StatLog.getSystemLogEntries('user_login_history', StatLog.Order.TimestampDesc, 200, (err, lh) => {
                            loginHistory = lh;

                            if(self.menuConfig.config.hideSysOpLogin) {
                                const noOpLoginHistory = loginHistory.filter(lh => {
                                    return false === User.isRootUserId(parseInt(lh.log_value)); //  log_value=userId
                                });

                                //
                                //  If we have enough items to display, or hideSysOpLogin is set to 'always',
                                //  then set loginHistory to our filtered list. Else, we'll leave it be.
                                //
                                if(noOpLoginHistory.length >= callersView.dimens.height || 'always' === self.menuConfig.config.hideSysOpLogin) {
                                    loginHistory = noOpLoginHistory;
                                }
                            }

                            //
                            //  Finally, we need to trim up the list to the needed size
                            //
                            loginHistory = loginHistory.slice(0, callersView.dimens.height);

                            return callback(err);
                        });
                    },
                    function getUserNamesAndProperties(callback) {
                        const getPropOpts = {
                            names       : [ 'location', 'affiliation' ]
                        };

                        const dateTimeFormat = self.menuConfig.config.dateTimeFormat || 'ddd MMM DD';

                        async.each(
                            loginHistory,
                            (item, next) => {
                                item.userId = parseInt(item.log_value);
                                item.ts     = moment(item.timestamp).format(dateTimeFormat);

                                User.getUserName(item.userId, (err, userName) => {
                                    if(err) {
                                        item.deleted = true;
                                        return next(null);
                                    } else {
                                        item.userName = userName || 'N/A';

                                        User.loadProperties(item.userId, getPropOpts, (err, props) => {
                                            if(!err && props) {
                                                item.location       = props.location || 'N/A';
                                                item.affiliation    = item.affils = (props.affiliation || 'N/A');
                                            } else {
                                                item.location       = 'N/A';
                                                item.affiliation    = item.affils = 'N/A';
                                            }
                                            return next(null);
                                        });
                                    }
                                });
                            },
                            err => {
                                loginHistory = loginHistory.filter(lh => true !== lh.deleted);
                                return callback(err);
                            }
                        );
                    },
                    function populateList(callback) {
                        const listFormat = self.menuConfig.config.listFormat || '{userName} - {location} - {affiliation} - {ts}';

                        callersView.setItems(_.map(loginHistory, ce => stringFormat(listFormat, ce) ) );

                        callersView.redraw();
                        return callback(null);
                    }
                ],
                (err) => {
                    if(err) {
                        self.client.log.error( { error : err.toString() }, 'Error loading last callers');
                    }
                    cb(err);
                }
            );
        });
    }
};