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

//  enigma-bbs
const { MenuModule }    = require('./menu_module.js');
const { resetScreen }   = require('./ansi_term.js');
const { Errors }        = require('./enig_error.js');
const {
    trackDoorRunBegin,
    trackDoorRunEnd
}                       = require('./door_util.js');

//  deps
const async         = require('async');
const SSHClient     = require('ssh2').Client;

exports.moduleInfo = {
    name    : 'DoorParty',
    desc    : 'DoorParty Access Module',
    author  : 'NuSkooler',
};

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

        //  establish defaults
        this.config             = options.menuConfig.config;
        this.config.host        = this.config.host || 'dp.throwbackbbs.com';
        this.config.sshPort     = this.config.sshPort || 2022;
        this.config.rloginPort  = this.config.rloginPort || 513;
    }

    initSequence() {
        let clientTerminated;
        const self = this;

        async.series(
            [
                function validateConfig(callback) {
                    return self.validateConfigFields(
                        {
                            host        : 'string',
                            username    : 'string',
                            password    : 'string',
                            bbsTag      : 'string',
                            sshPort     : 'number',
                            rloginPort  : 'number',
                        },
                        callback
                    );
                },
                function establishSecureConnection(callback) {
                    self.client.term.write(resetScreen());
                    self.client.term.write('Connecting to DoorParty, please wait...\n');

                    const sshClient = new SSHClient();

                    let pipeRestored = false;
                    let pipedStream;
                    let doorTracking;

                    const restorePipe = function() {
                        if(pipedStream && !pipeRestored && !clientTerminated) {
                            self.client.term.output.unpipe(pipedStream);
                            self.client.term.output.resume();

                            if(doorTracking) {
                                trackDoorRunEnd(doorTracking);
                            }
                        }
                    };

                    sshClient.on('ready', () => {
                        //  track client termination so we can clean up early
                        self.client.once('end', () => {
                            self.client.log.info('Connection ended. Terminating DoorParty connection');
                            clientTerminated = true;
                            sshClient.end();
                        });

                        //  establish tunnel for rlogin
                        sshClient.forwardOut('127.0.0.1', self.config.sshPort, self.config.host, self.config.rloginPort, (err, stream) => {
                            if(err) {
                                return callback(Errors.General('Failed to establish tunnel'));
                            }

                            doorTracking = trackDoorRunBegin(self.client);

                            //
                            //  Send rlogin
                            //  DoorParty wants the "server username" portion to be in the format of [BBS_TAG]USERNAME, e.g.
                            //  [XA]nuskooler
                            //
                            const rlogin = `\x00${self.client.user.username}\x00[${self.config.bbsTag}]${self.client.user.username}\x00${self.client.term.termType}\x00`;
                            stream.write(rlogin);

                            pipedStream = stream;   //  :TODO: this is hacky...
                            self.client.term.output.pipe(stream);

                            stream.on('data', d => {
                                //  :TODO: we should just pipe this...
                                self.client.term.rawWrite(d);
                            });

                            stream.on('close', () => {
                                restorePipe();
                                sshClient.end();
                            });
                        });
                    });

                    sshClient.on('error', err => {
                        self.client.log.info(`DoorParty SSH client error: ${err.message}`);
                        trackDoorRunEnd(doorTracking);
                    });

                    sshClient.on('close', () => {
                        restorePipe();
                        callback(null);
                    });

                    sshClient.connect( {
                        host        : self.config.host,
                        port        : self.config.sshPort,
                        username    : self.config.username,
                        password    : self.config.password,
                    });

                    //  note: no explicit callback() until we're finished!
                }
            ],
            err => {
                if(err) {
                    self.client.log.warn( { error : err.message }, 'DoorParty error');
                }

                //  if the client is still here, go to previous
                if(!clientTerminated) {
                    self.prevMenu();
                }
            }
        );
    }
};