var panopticon;

class Panopticon {
    constructor() {
        console.log( "Init panopticon" );
        this.languages = []
//        this.selectedHugvey = null;
        this.hugveys = new Vue( {
            el: "#interface",
            data: {
                uptime: 0,
                languages: [],
                hugveys: [],
                selectedId: null,
            },
            methods: {
                time_passed: function( hugvey, property ) {
                    return moment( Date( hugvey[property] * 1000 ) ).fromNow();
                },
                timer: function(hugvey, property) {
                    return panopticon.stringToHHMMSS( hugvey[property] );
                },
                loadNarrative: function( code, file ) {
                    panopticon.hugveys.selectedId = null;
                    return panopticon.loadNarrative( code, file );
                },
                pause: function(hv) {
                    hv.status = "loading";
                    return panopticon.pause(hv.id);
                },
                resume: function(hv) {
                    hv.status = "loading";
                    return panopticon.resume(hv.id);
                },
                restart: function(hv) {
                    hv.status = "loading";
                    return panopticon.restart(hv.id);
                },
                finish: function(hv) {
                    hv.status = "loading";
                    return panopticon.finish(hv.id);
                },
                change_lang: function(hv, lang_code) {
                    hv.status = "loading";
                    return panopticon.change_language(hv.id, lang_code);
                },
                showHugvey: function(hv) {
                    panopticon.hugveys.selectedId = hv.language ? hv.id : null;
                    panopticon.updateSelectedHugvey();
                }
            }
        } );



        this.socket = new ReconnectingWebSocket( "ws://localhost:8888/ws", null, { debug: false, reconnectInterval: 3000 } );
        this.graph = new Graph();
        
        this.eventDataSet = new vis.DataSet([
        	{content: '.', start: new Date(), type: 'point', group: 1}
        ]);
        this.timeline = false;
        
        document.getElementById('toggleTimeline').addEventListener('click', function(){
        	document.body.classList.toggle('showTimeline');
        });


        this.socket.addEventListener( 'open', ( e ) => {
            this.send( { action: 'init' } );
        } );
        
        // request close before unloading
        window.addEventListener('beforeunload', function(){
            panopticon.socket.close();
        });

        this.socket.addEventListener( 'close', function( e ) {
            console.log( 'Closed connection' );
        } );
        this.socket.addEventListener( 'message', ( e ) => {
            let msg = JSON.parse( e.data );
            if ( typeof msg['alert'] !== 'undefined' ) {
                alert( msg['alert'] );
            }

            if ( typeof msg['action'] === 'undefined' ) {
                console.error( "not a valid message: " + e.data );
                return;
            }
            
            console.debug(msg);
            
            switch ( msg['action'] ) {

                case 'status':
                    this.hugveys.uptime = this.stringToHHMMSS( msg['uptime'] );
                    this.hugveys.languages = msg['languages'];
                    this.languages = msg['languages'];
                    this.hugveys.hugveys = msg['hugveys'];
                    if(this.hugveys.selectedId) {
                        this.updateSelectedHugvey();
                    }
                    
                    if(!this.timeline) {
                    	console.log('init timeline');
                    	let groups = [];
                    	for(let hid of msg['hugvey_ids']) {
                    		groups.push({id: parseInt(hid), content: 'Hugvey #'+hid});
                    		this.eventDataSet.add({content: 'initiate', start: new Date(), type: 'point', group: parseInt(hid)})
                    	}
                    	let dataGroups = new vis.DataSet(groups);
                    	let options = {
//                        		'rollingMode': {'follow': true, 'offset': .8 }
                        	};
                    	console.log('groups', dataGroups, groups, options);
                    	
                    	this.timeline = new vis.Timeline(document.getElementById('timeline'), this.eventDataSet, dataGroups, options);
//                    	
                    	
                    	let startDate = new Date();
                    	startDate.setMinutes(startDate.getMinutes()-1);
                    	let endDate = new Date();
                    	endDate.setMinutes(endDate.getMinutes()+20);
                    	setTimeout(function(){
                    		panopticon.timeline.setWindow(startDate, endDate);	
                    	}, 500);
                    	
                    	console.log(startDate, endDate);
                    	this.timelineInterval = setInterval(function(){panopticon.timeline.moveTo(new Date());}, 1000);
                    }
                    break;

                case 'log':
                	let hv_id = parseInt(msg['id']);
                	if(this.timeline) {
//                		 {'action': 'log', 'id':hugvey_id, 'type': items[0], 'info', 'args'}
                		let d, parts;
                		switch(msg['type']){
                			case 'message':
//                				info:  en-njsm8bwbd "Are you up for a conversation?"
                				parts = msg['info'].trim().split(' ');
                				let msgId = parts.shift();
                				let msgUuid = parts.shift();
                				let msgEvent = parts.shift();
                				let msgContent = parts.join(' ');
                				let mId = 'm-'+msgUuid+'-'+hv_id;
                				d = this.eventDataSet.get(mId);
                				console.log(msgId, msgEvent, msgContent);
            					if(d !== null && msgEvent == 'done'){
            						d['end'] = new Date();
            						this.eventDataSet.update(d);
            						console.log('update', d);
            					} else {
            						this.eventDataSet.add({id: mId, content: msgContent, title: `${msgContent} (${msgId})`, start: new Date(), group: hv_id, 'className': 'message'});	
            					}
                				break;
                			case 'speaking':
//                				start/content/end
                				parts = msg['info'].trim().split(' ');
                				let info = parts.shift();
                				let id = parts.shift();
                				let content = parts.join(' ');
                				let scId = 'sc-'+id+'-'+hv_id;
                				
                				if(info.startsWith('start')){
                					this.eventDataSet.add({content: info, start: new Date(), type: 'point', group: hv_id, 'className': 'speech'});
                				}
                				if(info.startsWith('content')){
                					d = this.eventDataSet.get(scId);
                					if(d !== null){
                						console.log('alter');
                						d['content'] = content;
                						d['end']= new Date();
                						d['title'] = content;
                						this.eventDataSet.update(d);
                					} else {
                						console.log('add');
                						this.eventDataSet.add({id: scId, content: content, title: content, start: new Date(), group: hv_id, 'className': 'speech'});	
                					}
                				}
                				if(info.startsWith('end')){
                					d = this.eventDataSet.get(scId);
                					if(d !== null){
                    					d['end'] = new Date();
                    					this.eventDataSet.update(d);
                					}
                				}
                				
                				break;
                			case 'story':
//                				'info': 'start'/'finished'
                				this.eventDataSet.add({content: msg['type'] +': ' + msg['info'] + ': ' + msg['args'], start: new Date(), type: 'point', group: hv_id, 'className': 'story'});
                				break;

                			case 'condition':
                			case 'direction':
                				// don't draw these :-0
                				break;
                			default:
                				this.eventDataSet.add({content: msg['type'] +': ' + msg['info'] + ': ' + msg['args'], start: new Date(), type: 'point', group: hv_id});
                				break;
                		}
                	}
                	break;
            }
        } );
    }
    
    updateSelectedHugvey() {
        let hv = null;
        if(this.hugveys.selectedId) {
            hv = this.getHugvey(this.hugveys.selectedId);
            if(hv.language && this.graph.language_code != hv.language) {
                this.loadNarrative(hv.language);
            }
        }
        this.graph.updateHugveyStatus(hv);
    }
    
    getHugvey(id) {
        for(let hv of this.hugveys.hugveys) {
            if(hv.id == id) {
                return hv;
            }
        }
        return null;
    }

    send( msg ) {
        if ( this.socket.readyState == WebSocket.OPEN ) {
            this.socket.send( JSON.stringify( msg ) );
        } else {
            console.error( "Socket not open: ", this.socket.readyState );
        }
    }

    getStatus() {
        //        console.log('get status', this, panopticon);
        panopticon.send( { action: 'get_status', selected_id: panopticon.hugveys.selectedId } );
    }

    init() {
        setInterval( this.getStatus, 3000 );
    }

    stringToHHMMSS( string ) {
        var sec_num = parseInt( string, 10 ); // don't forget the second param
        var hours = Math.floor( sec_num / 3600 );
        var minutes = Math.floor(( sec_num - ( hours * 3600 ) ) / 60 );
        var seconds = sec_num - ( hours * 3600 ) - ( minutes * 60 );

        if ( hours < 10 ) { hours = "0" + hours; }
        if ( minutes < 10 ) { minutes = "0" + minutes; }
        if ( seconds < 10 ) { seconds = "0" + seconds; }
        return hours + ':' + minutes + ':' + seconds;
    }

    loadNarrative( code, file ) {
        if(typeof file == 'undefined') {
            for (let lang of this.languages) {
                if (lang['code'] == code) {
                    file = lang['file'];
                }
            }
        }
        let req = new XMLHttpRequest();
        let graph = this.graph;
        req.addEventListener( "load", function( e ) {
            graph.loadData( JSON.parse( this.response ), code );
            //           console.log(, e); 
        } );
        req.open( "GET", "/local/" + file );
        req.send();
    }

    resume( hv_id ) {
        this.send( { action: 'resume', hugvey: hv_id } )
    }
    pause( hv_id ) {
        this.send( { action: 'pause', hugvey: hv_id } )
    }
    restart( hv_id ) {
        this.send( { action: 'restart', hugvey: hv_id } );
    }
    finish( hv_id ) {
        this.send( { action: 'finish', hugvey: hv_id } );
    }
    change_language( hv_id, lang_code ) {
        this.send( { action: 'change_language', hugvey: hv_id, lang_code: lang_code } );
    }
    
    playFromSelected(msg_id) {
        if(!this.hugveys.selectedId) {
            alert('No hugvey selected');
        } else {
            this.send({ action: 'play_msg', hugvey: this.hugveys.selectedId, msg_id: msg_id })
        }
    }
}



window.addEventListener( 'load', function() {
    panopticon = new Panopticon();
    panopticon.init();
} );

class Graph {
    constructor() {
        this.width = 1280;
        this.height = 1024;
        this.nodeSize = 80;
        this.maxChars = 16;
        this.svg = d3.select( '#graph' );
        this.container = d3.select( '#container' );
        this.selectedMsg = null;
        this.language_code = null;
        this.messages = []; // initialise empty array. For the simulation, make sure we keep the same array object
        this.directions = []; // initialise empty array. For the simulation, make sure we keep the same array object
        this.conditions = []; // initialise empty array. For the simulation, make sure we keep the same array object
        this.diversions = []; // initialise empty array. For the simulation, make sure we keep the same array object

        let graph = this;
        this.controlDown = false;
        document.addEventListener( 'keydown', function( e ) {
            if ( e.which == "16" ) { // shift
                graph.controlDown = true;
                document.body.classList.add( 'controlDown' );
            }
        } );
        document.addEventListener( 'keyup', function( e ) {
            if ( e.which == "16" ) { // shift
                graph.controlDown = false;
                document.body.classList.remove( 'controlDown' );
            }
        } );

        let c = this.container;
        let zoomed = function() {
            c.attr( "transform", d3.event.transform );
        }
        this.svg.call( d3.zoom()
            .scaleExtent( [1 / 16, 8] )
            .on( "zoom", zoomed ) );

        this.nodesG = this.container.append( "g" )
            .attr( "id", "nodes" )

        this.linkG = this.container.append( "g" )
            .attr( "id", "links" );

        document.getElementById( 'btn-save' ).addEventListener( 'click', function( e ) { graph.saveJson(); } );
        document.getElementById( 'btn-addMsg' ).addEventListener( 'click', function( e ) { graph.createMsg(); } );
        document.getElementById( 'btn-diversions' ).addEventListener( 'click', function( e ) { graph.showDiversions(); } );
        document.getElementById( 'btn-audio' ).addEventListener( 'click', function( e ) { graph.showAudioFiles(); } );
    }

    clickMsg( msg ) {
        // event when a message is clicked.
        if ( this.controlDown ) {
            this.secondarySelectMsg( msg );
        } else {
            this.selectMsg( msg );
        }
    }

    secondarySelectMsg( msg ) {
        if ( this.selectedMsg !== null ) {
            this.addDirection( this.selectedMsg, msg );
        } else {
            console.error( 'No message selected as Source' );
        }
    }

    selectMsg( msg ) {
        let selectedEls = document.getElementsByClassName( 'selectedMsg' );
        while ( selectedEls.length > 0 ) {
            selectedEls[0].classList.remove( 'selectedMsg' );
        }
        document.getElementById( msg['@id'] ).classList.add( 'selectedMsg' );

        this.selectedMsg = msg;

        this.showMsg( msg );
    }

    updateMsg() {
        // used eg. after a condition creation.
        this.showMsg( this.selectedMsg );
    }
    
    getAudioUrlForMsg(msg) {
    	let isVariable = msg['text'].includes('$') ? '1' : '0';
    	let lang = panopticon.graph.language_code;
        return `http://localhost:8888/voice?text=${encodeURIComponent(msg['text'])}&variable=${isVariable}&lang=${lang}&filename=0`;
    }
    
    getNumericId(prefix) {
    	let id, i = 0;
    	let hasId= function(a, id) {
    		for(let i of a){
    			if(i['@id'] == id) {
    				return true;
    			}
    		}
    		return false;
    	}
    	do {
    		id = prefix + i;
    		i++;
    	} while(hasId(this.data, id))
    		
    	return id;
    }
    
    createDiversion(type) {
    	let div = {
    		"@id": this.getNumericId(this.language_code.substring( 0, 2 ) + `-div-${type}#`),
    		'@type': 'Diversion',
    		'type': type,
    		'params': {}
    	}
    	
    	if(type == 'no_response') {
    		div['params']['consecutiveSilences'] = 3;
    		div['params']['timesOccured'] = 0;
    		div['params']['returnAfterStrand'] = true;
    		div['params']['msgId'] = "";
    	}
    	else if(type == 'repeat') {
    		div['params']['regex'] = "can you repeat that\\?"; 
    	} else {
    		console.log("invalid type", type);
    		alert('invalid type for diversion');
    	}
    	
    	this.data.push( div );
        this.updateFromData();
        this.build();
        
        this.showDiversions();
        return msg;
    }
    
    deleteDiversion(div) {
         this._rmNode( div );
         this.showDiversions( );
    }
    
    showDiversions( ) {
    	let msgEl = document.getElementById( 'msg' );
        msgEl.innerHTML = "";
        
        let divsNoResponse =[], divsRepeat = [];
        for(let div of this.diversions) {
        	if(div['type'] == 'no_response') {
        		let returnAttrs = {
					'type': 'checkbox',
					'on': {
						'change': (e) => div['params']['returnAfterStrand'] = e.target.checked
					}
				}
        		if(div['params']['returnAfterStrand']) {
        			returnAttrs['checked'] = 'checked';
        		}
        		let msgOptions = [crel('option',"")];
        		let starts = this.messages.filter( m => m.hasOwnProperty('start') && m['start'] == true);
        		for(let startMsg of starts) {
        			let optionParams = {};
        			if(div['params']['msgId'] == startMsg['@id']) {
        				optionParams['selected'] = 'selected';
        			}
        			msgOptions.push(crel('option', optionParams , startMsg['@id']));
        		}
        		
        		divsNoResponse.push(crel(
        			'div', {
        				'class': 'diversion',
        				'on': {
        					'mouseover': function(e) {
        						if(div['params']['msgId'])
        							document.getElementById(div['params']['msgId']).classList.add('selectedMsg');
                            },
                            'mouseout': function(e) {
                            	if(div['params']['msgId'])
                            		document.getElementById(div['params']['msgId']).classList.remove('selectedMsg');
                            }
        				}
        			},
        			crel('h3', div['@id']),
        			crel(
        				'div', {
        					'class':'btn btn--delete',
        					'on': {
        						'click': (e) => this.deleteDiversion(div)
        					}
        				}, 'Delete diversion'),
        			crel('label', 'Consecutive Silences',
        				crel('input', {
        					'type': 'number',
        					'value': div['params']['consecutiveSilences'],
        					'on': {
        						'change': (e) => div['params']['consecutiveSilences'] = parseInt(e.target.value)
        					}
        				})
        			),
        			crel('label', 'On n-th instance',
        				crel('input', {
        					'type': 'number',
        					'value': div['params']['timesOccured'],
        					'on': {
        						'change': (e) => div['params']['timesOccured'] = parseInt(e.target.value)
        					}
        				})
        			),
        			crel('label', 'Return to point of departure afterwards',
        				crel('input', returnAttrs)
        			),
        			crel('label', 'Go to (start message)',
        				crel('select', {'on': {
    						'change': (e) => div['params']['msgId'] = e.target.value
    					}}, ...msgOptions)
        			)
        		));
        	} 
        	if(div['type'] == 'repeat'){
        		divsRepeat.push(crel(
        			'div', {'class': 'diversion'},
        			crel('h3', div['@id']),
        			crel(
        				'div', {
        					'class':'btn btn--delete',
        					'on': {
        						'click': (e) => this.deleteDiversion(div)
        					}
        				}, 'Delete diversion'),
        			crel('label', 'Regex',
        				crel('input', {
        					'type': 'text',
        					'value': div['params']['regex'],
        					'on': {
        						'change': (e) => div['params']['regex'] = e.target.value
        					}
        				})
        			)
        		));
        	}
        }
        
        console.log(divsNoResponse, divsRepeat);
        
        let divEl = crel(
        	'div',
    		{
    			'id': 'diversions'
    		},
        	crel('h1', 'Configure Diversions'),
        	crel('div',
        		crel('h2', 'In case of No Response'),
        		...divsNoResponse,
        		crel('div',
        			{
	        			'class': 'btn',
	        			'on': {
	        				'click': (e) => this.createDiversion('no_response')
	        			}
        			},
        			'New case for no_response'
        		)
        	),
        	crel('div',
        		crel('h2', 'Request repeat'),
        		...divsRepeat,
        		crel('div',
        			{
	        			'class': 'btn',
	        			'on': {
	        				'click': (e) => this.createDiversion('repeat')
	        			}
	        		},	
	    			'New case for repeat'
        		)
        	)
        );
        
        msgEl.appendChild(divEl);
    }

    showAudioFiles( ) {
    	let audioFilesEl = crel('div',{
	    		'id':'audioFiles'
	    	},
    		crel(
    			'div',
    			{
    				'class':'btn btn-close',
    				'on': {
    					'click': function() {
    						audioFilesEl.parentNode.removeChild(audioFilesEl)
    					}
    				}
    			},
    			'close'
    		));
    	for(let msg of panopticon.graph.messages) {
    		audioFilesEl.appendChild(crel(
    				'audio',
    				{'controls':'controls'},
    				crel('source', {'src': msg['audio'] ? msg['audio']['file'] : panopticon.graph.getAudioUrlForMsg(msg)})
    		))
    	}
    	document.getElementById("interface").appendChild(audioFilesEl);
    }

    showMsg( msg ) {
        let msgEl = document.getElementById( 'msg' );
        msgEl.innerHTML = "";
        
        if(msg == null){
            return;
        }
        
        

        let startAttributes = {
            'name': msg['@id'] + '-start',
//            'readonly': 'readonly',
            'type': 'checkbox',
            'on': {
                'change': this.getEditEventListener()
            }
        }
        if ( msg['start'] == true ) {
            startAttributes['checked'] = 'checked';
        }
        let beginningAttributes = {
            'name': msg['@id'] + '-beginning',
//                'readonly': 'readonly',
            'type': 'checkbox',
            'on': {
                'change': this.getEditEventListener()
            }
        }
        if ( msg['beginning'] == true ) {
        	beginningAttributes['checked'] = 'checked';
        }
        
        let params = {};
        if(msg.hasOwnProperty('params')) {
        	params = msg['params'];
        } else {
        	msg['params'] = {};
        }
        
        let audioSrcEl = crel('source', {'src': msg['audio'] ? msg['audio']['file'] : this.getAudioUrlForMsg(msg)});
//        console.log(msg['audio']);
        let audioSpan = crel(
                'span',
                {
                    'title':  msg['audio'] ?  msg['audio']['file'] : "",
                    'class': "label-value",
                },
                crel(
            		'audio', {'controls': 'controls'},
            		audioSrcEl
                ),
                crel('div', msg['audio'] ? crel(
                		'div',
                		crel('div',  {
                            'class':'btn btn--delete',
                            'on': {
                                'click': function(e) {
                                	e.stopPropagation();
                                	e.preventDefault();
                                    panopticon.graph.getNodeById(msg['@id'])['audio'] = null;
                                    panopticon.graph.showMsg(msg);
                                }
                            }
                         }, 'del'),
                         "uploaded"
                	) : 'Auto-generated')
            );
        let msgInfoEl = crel( 'div', { 'class': 'msg__info' },
            crel('div', {
                'class':'btn btn--delete btn--delete-msg',
                'on': {
                    'click': function(e) {
                        if(confirm(`Are you sure you want to remove message ${msg['@id']}`)) {
                            panopticon.graph.rmMsg(msg);
                            panopticon.graph.showMsg(null);
                        }
                    }
                }
             }, 'delete'),
            crel( 'h1', { 'class': 'msg__id' }, msg['@id'] + ` (${panopticon.graph.distances[msg['@id']]})` ),
            crel( 'label',
                crel( 'span', 'Text' ),
                crel( 'input', {
                    'name': msg['@id'] + '-text',
                    'value': msg['text'],
                    'on': {
                        'change': this.getEditEventListener(function(){
                        	audioSrcEl.src = panopticon.graph.getAudioUrlForMsg(msg);
                        	audioSrcEl.parentElement.load();
                        })
                    }
                } )
            ),
            crel( 'label',
                crel( 'span', 'Start' ),
                crel( 'input', startAttributes )
            ),
            crel( 'label',
                crel( 'span', 'Beginning' ),
                crel( 'input', beginningAttributes )
            ),

            crel( 'label',
                crel( 'span', 'Audio' ),
                audioSpan,
                crel( 'input', {
                    'type': 'file',
                    'name': 'audio',
                    'accept': '.wav,.ogg,.mp3',
                    'on': {
                        'change': function(e) {
                            audioSpan.innerHTML = "...";
                            panopticon.graph.saveJson(msg['@id'], e.target, function(e2){
//                                console.log(e, e2);
                                audioSpan.innerHTML = e.target.files[0].name + "<sup>*</sup>";
                                // reload graph:
//                                console.log('reload', panopticon.graph.language_code);
                                panopticon.loadNarrative(panopticon.graph.language_code);
                            });
//                            console.log(this,e);
                        }
                    }
                } )
            ),
            crel( 'label',
                    crel( 'span', {
                        "title": "The time after the reply in which one can still interrupt to continue speaking"
                    }, 'Afterrun time' ),
                    crel( 'input', {
                        'name': msg['@id'] + '-afterrunTime',
                        'step': "0.1",
                        'value': msg['afterrunTime'],
                        'type': 'number',
                        'on': {
                            'change': this.getEditEventListener()
                        }
                } )
            ),
            crel( 'label',
                    crel( 'span', {
                        "title": "Playback volume factor"
                    }, 'Volume factor' ),
                    crel( 'input', {
                        'name': msg['@id'] + '-params.vol',
                        'value': params.hasOwnProperty('vol') ? params['vol'] : 1,
                        'step': "0.1",
                        'type': 'number',
                        'on': {
                            'change': this.getEditEventListener()
                        }
                } )
            ),
            crel( 'label',
                    crel( 'span', {
                        "title": "Playback tempo factor"
                    }, 'Tempo factor' ),
                    crel( 'input', {
                        'name': msg['@id'] + '-params.tempo',
                        'value': params.hasOwnProperty('tempo') ? params['tempo'] : 1,
                        'step': "0.1",
                        'min': "0.1",
                        'type': 'number',
                        'on': {
                            'change': this.getEditEventListener()
                        }
                } )
            ),
            crel( 'label',
                    crel( 'span', {
                        "title": "Playback pitch factor"
                    }, 'Pitch factor' ),
                    crel( 'input', {
                        'name': msg['@id'] + '-params.pitch',
                        'value': params.hasOwnProperty('pitch') ? params['pitch'] : 0,
                        'step': "0.1",
                        'type': 'number',
                        'on': {
                            'change': this.getEditEventListener()
                        }
                } )
            ),
            
            // color for beter overview

            crel( 'label',
                    crel( 'span', {
                        "title": "Color - for your eyes only"
                    }, 'Color' ),
                    crel( 'input', {
                        'name': msg['@id'] + '-color',
                        'value': msg.hasOwnProperty('color') ? msg['color'] : '#77618e',
                        'type': 'color',
                        'on': {
                            'change': this.getEditEventListener()
                        }
                } )
            )
        );
        msgEl.appendChild( msgInfoEl );
        

        
        if(panopticon.hugveys.selectedId) {
            let playEl = crel(
                'div',
                {'class': 'play'},
                crel(
                    'div', {
                        'class': 'btn btn--play',
                        'on': {
                            'click': function (e) {
                                console.log('go save');
                                panopticon.graph.saveJson(null, null, function(){
                                    console.log('saved, now play');
                                    panopticon.playFromSelected(msg['@id']);
                                });
                            }
                        }
                    },
                    "Save & play on #" + panopticon.hugveys.selectedId
                )
            );
            msgEl.appendChild(playEl);
        }
        

        // let directionHEl = document.createElement('h2');
        // directionHEl.innerHTML = "Directions";

        let fromDirections = [], toDirections = [];

        for ( let direction of this.getDirectionsTo( msg ) ) {
            toDirections.push( this.getDirectionEl( direction, msg ) );
        }

        for ( let direction of this.getDirectionsFrom( msg ) ) {
            fromDirections.push( this.getDirectionEl( direction, msg ) );
        }
        let directionsEl = crel( 'div', { 'class': 'directions' },
            crel( 'h2', 'Directions' ),
            ...toDirections,
            crel('div',{
                'class': 'btn btn--create',
                    'on': {
                        'click': function(e) {
                            panopticon.graph.createConnectedMsg(msg);
                        }
                    }
                }, 'Create new message'),
            ...fromDirections
        );
        msgEl.appendChild( directionsEl );

    }

    getDirectionEl( direction, msg ) {
        let g = this;
        let directionEl = crel('div',
                {
                    'class': 'direction ' + (direction['source'] == msg ? 'dir-to' : 'dir-from'),
                    'on': {
                        'mouseover': function(e) {
                            directionEl.classList.add('dir-highlight');
                            document.getElementById(direction['@id']).classList.add('dir-highlight');
                        },
                        'mouseout': function(e) {
                            directionEl.classList.remove('dir-highlight');
                            document.getElementById(direction['@id']).classList.remove('dir-highlight');
                        }
                    }
                },
                crel(
                    'h3',
                    {'title': direction['@id']},
                    direction['source'] == msg ? `To ${direction['target']['text']}`: `From ${direction['source']['text']}`
                    ),
                crel('div', {
                    'class':'btn btn--delete',
                    'on': {
                        'click': ( e ) => {
                            if(confirm("Do you want to remove this direction and its conditions?")) {
                                g.rmDirection( direction );   
                            }
                        }
                    }
                }, 'disconnect')
        );
        
        for ( let conditionId of direction['conditions'] ) {
            let condition = this.getNodeById( conditionId );
            directionEl.appendChild( this.getEditConditionFormEl( condition, direction ) );
        }

        directionEl.appendChild( this.getAddConditionFormEl( direction ) );

        return directionEl;
    }

    getEditConditionFormEl( condition, direction ) {
        let conditionEl = crel( 'div', { 'class': 'condition condition--edit' },
            crel( 'h4', { 'title': condition['@id'] }, condition['type'] ),
            crel('div', {
                'class':'btn btn--delete',
                'on': {
                    'click': ( e ) => {
                        if(confirm("Do you want to remove this condition?")) {
//                            console.log('remove condition for direction', condition, direction);
                            panopticon.graph.rmCondition( condition, direction );   
                        }
                    }
                }
            }, 'delete'),
            ...this.getConditionInputsForType(condition['type'], condition['@id'], condition['vars'])
        )
        let labelLabel = document.createElement( 'label' );
        labelLabel.innerHTML = "Description";
        let labelInput = crel( 'input', {
            'name': `${condition['@id']}-label`,
            'value': typeof condition['label'] == 'undefined' ? "" : condition['label'],
            'on': {
                'change': this.getEditEventListener()
            }
        } );
        labelLabel.appendChild( labelInput );
        conditionEl.appendChild( labelLabel );
        

//        for ( let v in condition['vars'] ) {
//            let varLabel = document.createElement( 'label' );
//            varLabel.innerHTML = v;
//            let varInput = document.createElement( 'input' );
//            if ( v == 'seconds' ) {
//                varInput.type = 'number';
//            }
//            varInput.name = `${condition['@id']}-vars.${v}`;
//            varInput.value = condition['vars'][v];
//            varInput.addEventListener( 'change', this.getEditEventListener() );
//            varLabel.appendChild( varInput );
//            conditionEl.appendChild( varLabel );
//        }
        return conditionEl;
    }

    getConditionTypes() {
        return {
                'timeout': {
                    'seconds': { 'type': 'number', 'value': 10, 'min': 0, 'step': 0.1, 'unit': "s" },
                    'onlyIfNoReply': { 'type': 'checkbox', label: "Only if no reply", "title": "This timeout is only used if the participant doesn't say a word. If the participant starts speaking within the time of this timeout condition, only other conditions are applicable." },
                    'needsReply': { 'type': 'checkbox', label: "Reply needed", "title": "If checked, the timeout is counted if met. Used by consecutive-timeouts diversions." },
                },
                'replyContains': {
                    'delays.0.minReplyDuration': { 'type': 'number', 'value': 0, 'min': 0, 'step': 0.1, 'label': 'Delay 1 - reply duration', 'unit': "s", 'readonly': 'readonly' },
                    'delays.0.waitTime': { 'type': 'number', 'value': 3, 'min': 0, 'step': 0.1 , 'label': 'Delay 1 - wait time', 'unit': "s" },
                    'delays.1.minReplyDuration': { 'type': 'number', 'value': 5, 'min': 0, 'step': 0.1, 'label': 'Delay 2 - reply duration', 'unit': "s" },
                    'delays.1.waitTime': { 'type': 'number', 'value': 1, 'min': 0, 'step': 0.1, 'label': 'Delay 2 - time', 'unit': "s" },
                    'delays.2.minReplyDuration': { 'type': 'number', 'value': 10, 'min': 0, 'step': 0.1, 'label': 'Delay 3 - reply duration', 'unit': "s" },
                    'delays.2.waitTime': { 'type': 'number', 'value': 0, 'min': 0, 'step': 0.1, 'label': 'Delay 3 - time', 'unit': "s" },
                    'regex': { 'value': '','placeholder': "match any input" },
                    'instantMatch': { 'value': '', 'title': "When matched, don't wait for reply to finish. Instantly take this direction.", 'type':'checkbox' },
                },
                'variable': {
                    'variable': { 'value': '','placeholder': "Variable name (without $)" },
                    'notSet': { "label": "Not set", 'value': '', 'title': "Match if the variable is _not_ set.", 'type':'checkbox' },
                }
            };
    }
    
    getConditionInputsForType( type, conditionId, values ) {
        let inputs = [];
        let vars = this.getConditionTypes()[type];
        for ( let v in vars ) {
            let attr = vars[v];
            attr['name'] = typeof conditionId == 'undefined' ? v : `${conditionId}-vars.${v}`;
            if(typeof values != 'undefined') {
                let value = this._getValueForPath(v, values);
                if(attr['type'] == 'checkbox' ) {
                    if(value)
                        attr['checked'] = 'checked';
                }
                attr['value'] = typeof value == 'undefined' ? "": value;
                attr['on'] = {
                   'change': this.getEditEventListener()     
                } ;
            } else {
//                console.log(attr);
            }
            
            inputs.push(
                crel( 'label',
                    crel( 'span', {
                        'title': attr.hasOwnProperty('title') ? attr['title'] : ""
                        }, attr.hasOwnProperty('label') ? attr['label'] : v ),
                    crel( 'input', attr )
//                    crel('span', {'class': 'label-unit'}, attr.hasOwnProperty('unit') ? attr['unit'] : "" )
                )
            );
        }
        return inputs;
    }

    fillConditionFormForType( conditionForm, type, values ) {
        conditionForm.innerHTML = "";
        let inputs = this.getConditionInputsForType(type);
        for(let i of inputs) {
            conditionForm.appendChild(i);
        }
    }
    
    _getValueForPath(path, vars) {
        path = path.split( '.' ); // use vars.test to set ['vars']['test'] = value
        let v = vars;
        let result = null;
        for ( let i = 0; i < path.length; i++ ) {
            if(!isNaN(parseInt(path[i])) && isFinite(path[i])) {
                // is int, use array, instead of obj
                path[i] = parseInt(path[i]);
            }
            v = v[path[i]];
            if(i == path.length - 1) {
                result = v;
            }
            if(typeof v == 'undefined') {
                break;
            }
        }
        return result;
    }
    
    /**
     * Save an array path (string) with a value to an object. Used to turn
     * strings into nested arrays
     * @param string path
     * @param {any} value
     * @param array|object vars
     */
    _formPathToVars(path, value, vars) {
        path = path.split( '.' ); // use vars.test to set ['vars']['test'] = value
        let res = vars;
        for ( let i = 0; i < path.length; i++ ) {
            if ( i == ( path.length - 1 ) ) {
                res[path[i]] = value;
            } else {
                if(!isNaN(parseInt(path[i+1])) && isFinite(path[i+1])) {
                    // is int, use array, instead of obj
                    path[i+1] = parseInt(path[i+1]);
                }
                if(typeof res[path[i]] == 'undefined') {
                    res[path[i]] = typeof path[i+1] == 'number' ? [] : {}
                }
                res = res[path[i]];
            }
        }
        return vars;
    }

    getAddConditionFormEl( direction ) {

        let optionEls = [];
        let types = this.getConditionTypes();
        for ( let type in types ) {
            optionEls.push( crel( 'option', type ) );
        }

        let conditionForm = crel( 'div', { 'class': 'condition--vars' } );
        let g = this;
        let addConditionEl = crel( 'div', { 'class': 'condition condition--add' },
            crel( 'form', {
                'on': {
                    'submit': function( e ) {
                        e.preventDefault();
                        let form = new FormData( e.target );
                        console.log( 'submit', form );
                        let type = form.get( 'type' );
                        form.delete( 'type' );
                        let label = form.get( 'label' );
                        form.delete( 'label' );
                        
                        // checkboxes to true/false
                        let defs = g.getConditionTypes()[type];
//                        console.log(defs);
                        for(let field in defs) {
//                            console.log(field);
                            if(defs[field]['type'] == 'checkbox') {
                                console.info('configure checkbox', field);
                                form.set(field, form.has(field));
                            }
                        }
                        
                        let vars = {};
                        for ( var pair of form.entries() ) {
                            // FormData only has strings & blobs, we want booleans:
                            if(pair[1] === 'true') pair[1] = true;
                            if(pair[1] === 'false') pair[1] = false; 
                            
                            vars = g._formPathToVars(pair[0], pair[1], vars);
                        }
                        // TODO: checkboxes
//                        console.log("Createded", vars);
                        g.addConditionForDirection( type, label, vars, direction );
                    }
                }
            },
                crel( "h4", {
                    'class': "divToggle",
                    'on': {
                        'click': function(e) { this.classList.toggle('opened'); }
                    }
                }, "Create New Condition" ),
                crel('div', {'class': 'divToggle-target'},
                    crel( "label",
                        crel( 'span', "Type" ),
                        crel( 'select', {
                            'name': 'type',
                            'on': {
                                'change': function( e ) {
                                    g.fillConditionFormForType( conditionForm, e.target.value );
                                }
                            }
                        }, optionEls ),
                    ),
                    crel( "label",
                        crel( 'span', "Description" ),
                        crel( 'input', { 'name': 'label' } )
                    ),
                    conditionForm,
                    crel( 'input', {
                        'type': 'submit',
                        'value': 'create'
                    } )
                )
            )
        );
        this.fillConditionFormForType( conditionForm, optionEls[0].value );

        return addConditionEl;
    }
    
    /**
     * remove condition from the graph or merely from the given direction
     * @param {any} condition The condition to remove
     * @param {any} direction if given, only remove from this direction
     */
    rmCondition( condition, direction ) {
        let id = condition['@id'];
        // TODO
        if ( typeof direction != 'undefined' ) {
            let pos = direction['conditions'].indexOf(id);
            console.log('delete', id, 'on direction');
            if(pos > -1) {
                direction['conditions'].splice(pos, 1);
            }
            
            for(let dir of this.directions) {
//                console.log('check if condition exists for dir', dir)
                if(dir['conditions'].indexOf(id) > -1) {
                    console.log("Condition still in use");
                    this.updateFromData();
                    this.build();
                    this.updateMsg();
                    return;
                }
            }
            console.log('No use, remove', condition)
            this._rmNode( condition );
        } else {
            for(let dir of this.directions) {
                let pos = dir['conditions'].indexOf(id);
                if(pos > -1) {
                    dir['conditions'].splice(pos, 1);
                }
            }

            console.log('remove condition?', id)
            this._rmNode( condition );
        }
        this.updateMsg();
    }

    getConditionEl( condition ) {
        let conditionEl = document.createElement( 'div' );

        return conditionEl;
    }

    getDirectionsFrom( msg ) {
        return this.directions.filter( d => d['source'] == msg );
    }

    getDirectionsTo( msg ) {
        return this.directions.filter( d => d['target'] == msg );
    }


    addMsg(skipRebuild) {
        let msg = {
            "@id": this.language_code.substring( 0, 2 ) + "-n" + Date.now().toString( 36 ),
            "@type": "Msg",
            "text": "New",
            "start": false,
            "afterrunTime": 0.5,
        }
        this.data.push( msg );
        
        console.log("skip or not to skip?", skipRebuild);
        if(typeof skipRebuild == 'undefined' || !skipRebuild) {
	        this.updateFromData();
	        this.build();
	        this.selectMsg(msg);
        }
        
        return msg;
    }

    rmMsg( msg ) {
        let invalidatedDirections = this.directions.filter( d => d['source'] == msg || d['target'] == msg );
        console.log( 'invalidated', invalidatedDirections );
        for ( let dir of invalidatedDirections ) {
            let i = this.data.indexOf( dir );
            this.data.splice( i, 1 );
        }
        this._rmNode( msg );
    }

    _rmNode( node ) {
        // remove msg/direction/condition/etc
        let i = this.data.indexOf( node );
        this.data.splice( i, 1 );
        this.updateFromData();
        this.build();
        return this.data;
    }

    addConditionForDirection( type, label, vars, direction ) {
        let con = this.addCondition( type, label, vars, true );
        direction['conditions'].push( con['@id'] );
        this.updateFromData();
        this.build();

        this.updateMsg();
    }

    addCondition( type, label, vars, skip ) {
        let con = {
            "@id": this.language_code.substring( 0, 2 ) + "-c" + Date.now().toString( 36 ),
            "@type": "Condition",
            "type": type,
            "label": label,
            "vars": vars
        }
        this.data.push( con );
        if ( skip !== true ) {
            this.updateFromData();
            this.build();
        }
        return con;
    }

    addDirection( source, target ) {
        let dir = {
            "@id": this.language_code.substring( 0, 2 ) + "-d" + Date.now().toString( 36 ),
            "@type": "Direction",
            "source": source,
            "target": target,
            "conditions": []
        }
        this.data.push( dir );
        
        let skipDistances;
        // orphaned target and source has no other destinations. We can copy the vertical position:
        if(this.getDirectionsFrom( source ).length < 1 && this.getDirectionsFrom( target ).length < 1 && this.getDirectionsTo( target ).length < 1) {
        	skipDistances = true;
        	let distance = this.distances[source['@id']];
        	let d = [distance[0] + 1, distance[1]];
        	// create a distance based on source's position
        	// this saves us from running the slow calculateDistancesFromStart
        	this.distances[target['@id']] = d; 
        } else {
        	skipDistances = false;
        }
        
        this.updateFromData(skipDistances);
        this.build();
        return dir;
    }

    rmDirection( dir ) {
        this._rmNode( dir );
        // todo, remove orphaned conditions
    }

    createMsg() {
        this.addMsg();
        this.build();
    }
    
    createConnectedMsg(sourceMsg) {
    	console.time('createConnected');
    	console.time("Add");
        let newMsg = this.addMsg(true); // skipRebuild = true, as addDirection() already rebuilds the graph
        this.getNodeById(newMsg['@id']).y = this.getNodeById(sourceMsg['@id']).y;
        
        if(this.getNodeById(sourceMsg['@id']).hasOwnProperty('color')){
        	this.getNodeById(newMsg['@id']).color = this.getNodeById(sourceMsg['@id']).color	
        }
        console.timeEnd("Add");
        
        console.time("direction");
        this.addDirection(sourceMsg, newMsg);
        console.timeEnd("direction");
        console.time("build");
//        this.build(); // build is already done in addDirection()
        console.timeEnd("build");

        // reselect so that overview is updated
        console.time("Select");
        this.selectMsg(newMsg);
        console.timeEnd("Select");
        console.timeEnd('createConnected');
    }

    getNodeById( id ) {
        return this.data.filter( node => node['@id'] == id )[0];
    }

    /**
     * Use wrapper method, because for event handlers 'this' will refer to
     * the input object
     */
    getEditEventListener(callback) {
        let graph = this;
        let el = function( e ) {
            console.info("Changed", e);
            let parts = e.srcElement.name.split( '-' );
            let field = parts.pop();
            let id = parts.join('-');
            let node = graph.getNodeById( id );
            let path = field.split( '.' ); // use vars.test to set ['vars']['test'] = value
            var res = node;
            let value = e.srcElement.value
            if(e.srcElement.type == 'checkbox') {
                value = e.srcElement.checked; 
            }
            for ( var i = 0; i < path.length; i++ ) {
                if ( i == ( path.length - 1 ) ) {
                    res[path[i]] = value;
                } else {
                    res = res[path[i]];
                }
            }

            // node[field] = e.srcElement.value;

            graph.build();
            
            if(typeof callback !== 'undefined'){
            	callback();
            }
        }
        return el;
    }

    getJsonString() {
        // recreate array to have the right order of items.
        this.data = [...this.messages, ...this.conditions,
        ...this.directions, ...this.diversions]
        let d = [];
//        let toRemove = ['sourceX', 'sourceY', 'targetX', 'targetY', 'x', 'y', 'vx', 'vy']
        let toRemove = ['sourceX', 'sourceY', 'targetX', 'targetY', 'vx', 'vy']
        for ( let node of this.data ) {
            let n = {};
//            console.log( node['source'] );
            for ( let e in node ) {
                if ( node.hasOwnProperty( e ) && toRemove.indexOf( e ) == -1 ) {
                    if ( this.data.indexOf( node[e] ) != -1 ) {
                        n[e] = node[e]['@id'];
                    } else {
                        n[e] = node[e];
                    }
                }
            }
            d.push( n );
        }
        console.info("Jsonified graph:",d);
        return JSON.stringify( d );
    }

    downloadJson() {
        if ( !this.language_code ) {
            alert( "Make sure to load a language first" )
        }

        var blob = new Blob( [this.getJsonString()], { type: 'application/json' } );
        if ( window.navigator.msSaveOrOpenBlob ) {
            window.navigator.msSaveBlob( blob, "pillow_talk.json" );
        }
        else {
            var elem = window.document.createElement( 'a' );
            elem.href = window.URL.createObjectURL( blob );
            elem.download = "pillow_talk.json";
            document.body.appendChild( elem );
            elem.click();
            document.body.removeChild( elem );
        }
    }

    saveJson( msg_id, fileInputElement, callback ) {
        if ( !this.language_code ) {
            alert( "Make sure to load a language first" )
        }

        let formData = new FormData();

        formData.append( "language", this.language_code );

        if ( msg_id ) {
            formData.append( "message_id", msg_id );
            formData.append( "audio", fileInputElement.files[0] );
        }

        let blob = new Blob( [this.getJsonString()], { type: "application/json" } );
        formData.append( "json", blob );
        console.info("Save json", formData );
        var request = new XMLHttpRequest();
        request.open( "POST", "http://localhost:8888/upload" );
        
        if(callback) {
            request.addEventListener( "load", callback);
        }
        
        request.send( formData );
    }

    loadData( data, language_code ) {
        this.language_code = language_code;
        this.data = data;
        this.updateFromData();
        this.build( true );
    }

    updateFromData(skipDistances) {
        this.messages = this.data.filter(( node ) => node['@type'] == 'Msg' );
        this.directions = this.data.filter(( node ) => node['@type'] == 'Direction' );
        this.conditions = this.data.filter(( node ) => node['@type'] == 'Condition' );
        this.diversions = this.data.filter(( node ) => node['@type'] == 'Diversion' );
        
        document.getElementById('current_lang').innerHTML = "";
        document.getElementById('current_lang').appendChild(crel('span', {
            'class': 'flag-icon ' + this.language_code
        }));
        
        if(typeof skipDistances == 'undefined' || !skipDistances) {
        	this.distances = this.calculateDistancesFromStart();
        }

        // save state;
        this.saveState();
    }
    
    updateHugveyStatus(hv) {
        let els = document.getElementsByClassName('beenHit');
        while(els.length > 0) {
            els[0].classList.remove('beenHit');
        }
        if(!hv || typeof  hv['history'] == 'undefined') {
            return;
        }
        
        for(let msg of hv['history']['messages']) {
            document.getElementById(msg[0]['id']).classList.add('beenHit');
        }
        for(let msg of hv['history']['directions']) {
            document.getElementById(msg[0]['id']).classList.add('beenHit');
        }
    }

    saveState() {
        window.localStorage.setItem( "lastState", this.getJsonString() );
    }

    hasSavedState() {
        return window.localStorage.getItem( "lastState" ) !== null;
    }

    loadFromState() {
        this.loadData( JSON.parse( window.localStorage.getItem( "lastState" ) ) );
    }

    build( isInit ) {
        this.simulation = d3.forceSimulation( this.messages )
            .force( "link", d3.forceLink( this.directions ).id( d => d['@id'] ).strength(0) )
//            .force( "charge", d3.forceManyBody().strength( 100 ) )
//            .force( "center", d3.forceCenter( this.width / 2, this.height / 2 ) )
            .force( "collide", d3.forceCollide( this.nodeSize * 1.5 ).strength(3) )
            .force( "forceX", d3.forceX(function(m){
            	let fx = panopticon.graph.distances[m['@id']] !== null ? panopticon.graph.distances[m['@id']][0] * panopticon.graph.nodeSize * 4 : 0
//            	console.log('fx', m['@id'], panopticon.graph.distances[m['@id']], fx);
            	return fx;
            }).strength(50))
            .force( "forceY", d3.forceY(function(m){
//            	if(panopticon.graph.distances[m['@id']] !== null ) 
//            		console.log(panopticon.graph.distances[m['@id']][1]);
            	let fy = panopticon.graph.distances[m['@id']] !== null ? panopticon.graph.distances[m['@id']][1] * panopticon.graph.nodeSize * 3: 0
//            	console.log('fx', m['@id'], panopticon.graph.distances[m['@id']], fx);
            	return fy;
            }).strength(50))
//            .force( "forceY", d3.forceY(m => panopticon.graph.distances[m['@id']] !== null ? 0 : panopticon.graph.nodeSize * 3 ).strength(30))
            ;
        this.simulation.velocityDecay(.99);

        // Update existing nodes
        let node = this.nodesG
            .selectAll( "g" )
            .data( this.messages, n => n['@id'] )
            ;
        

        // Update existing nodes
        let newNode = node.enter();

        let newNodeG = newNode.append( "g" )
            .attr( 'id', d => d['@id'] )
            .on( 'click', function( d ) {
                this.clickMsg( d );
            }.bind( this ) )
            ;
        let circle = newNodeG.append( "circle" )
            .attr( 'r', this.nodeSize )
            // .text(d => d.id)
            ;
        
        let textId = newNodeG.append( "text" ).attr( 'class', 'msg_id' );
        let textContent = newNodeG.append( "text" ).attr( 'class', 'msg_txt' );
        let statusIcon = newNodeG.append( "image" )
            .attr( 'class', 'status_icon' )
            .attr( 'x', '-10' )
            .attr( 'y', '10' )
            .attr( 'width', '20' )
            .attr( 'height', '20' )
            ;

        // remove
        node.exit().remove();
        node = node.merge( newNodeG );
        

        // for all existing nodes:
        node.attr( 'class', msg => {
            let classes = [];
            if ( this.selectedMsg == msg ) classes.push( 'selectedMsg' );
            if ( msg['start'] == true ) classes.push( 'startMsg' );
            if ( this.getDirectionsFrom( msg ).length < 1 ) {
                classes.push( 'endMsg' );
                if ( this.getDirectionsTo( msg ).length < 1 ) classes.push( 'orphanedMsg' );
            }

            return classes.join( ' ' );
        } )
        
        .on(".drag", null)
        .call( 
            	d3.drag( this.simulation )
            	.on("start", function(d){
            		if (!d3.event.active) panopticon.graph.simulation.alphaTarget(0.3).restart();
            		  d.fx = d.x;
            		  d.fy = d.y;
                })
                .on('drag', function(d){
            		d.fx = d3.event.x;
            		  d.fy = d3.event.y;
            		})
            	.on("end", function(d){
            		if (!d3.event.active) panopticon.graph.simulation.alphaTarget(0);
            		  d.fx = null;
            		  d.fy = null;
            		})
//            	.container(document.getElementById('container'))
            	
            );
        
        node.select('circle').attr('style', (d) => 'fill: ' + (d.hasOwnProperty('color') ? d['color'] : '#77618e'));

        let link = this.linkG
            .selectAll( "line" )
            .data( this.directions )
            ;
        let newLink = link.enter()
            .append( "line" )
            ;
        
        //remove
        link.exit().remove();
        link = link.merge( newLink );

        link.attr( 'class', l => { return `link ` + ( l['conditions'].length == 0 ? "link--noconditions" : "link--withconditions" ); } );
        link.attr('id', (l) => l['@id']);

        let formatText = ( t ) => {
            if ( t.length > this.maxChars ) {
                return t.substr( 0, this.maxChars - 3 ) + '...';
            } else {
                return t;
            }
        };

        node.selectAll( "text.msg_id" ).text( d => d['@id'] );
        node.selectAll( "text.msg_txt" ).text( d => formatText( `${d['text']}` ) );
        node.selectAll( "image.status_icon" ).attr('xlink:href', d => d['audio'] ? '' : '/images/music-broken.svg');
        // console.log('q');
        // // TODO: update text
        // let text = newNodeG.append("text")
        //       // .attr('stroke', "black")
        //     .text(d => formatText(`(${d['@id']}) ${d['text']}`))
        //     // .attr('title', d => d.label)
        //     ;

        let n = this.nodesG;
        this.simulation.on( "tick", () => {
            link
                .each( function( d ) {
                    let sourceX, targetX, midX, dx, dy, angle;
                    // This mess makes the arrows exactly perfect.
                    // thanks to http://bl.ocks.org/curran/9b73eb564c1c8a3d8f3ab207de364bf4
                    if ( d.source.x < d.target.x ) {
                        sourceX = d.source.x;
                        targetX = d.target.x;
                    } else if ( d.target.x < d.source.x ) {
                        targetX = d.target.x;
                        sourceX = d.source.x;
                    } else if ( d.target.isCircle ) {
                        targetX = sourceX = d.target.x;
                    } else if ( d.source.isCircle ) {
                        targetX = sourceX = d.source.x;
                    } else {
                        midX = ( d.source.x + d.target.x ) / 2;
                        if ( midX > d.target.x ) {
                            midX = d.target.x;
                        } else if ( midX > d.source.x ) {
                            midX = d.source.x;
                        } else if ( midX < d.target.x ) {
                            midX = d.target.x;
                        } else if ( midX < d.source.x ) {
                            midX = d.source.x;
                        }
                        targetX = sourceX = midX;
                    }

                    dx = targetX - sourceX;
                    dy = d.target.y - d.source.y;
                    angle = Math.atan2( dx, dy );

                    // Compute the line endpoint such that the arrow
                    // is touching the edge of the node rectangle perfectly.
                    d.sourceX = sourceX + Math.sin( angle ) * this.nodeSize;
                    d.targetX = targetX - Math.sin( angle ) * this.nodeSize;
                    d.sourceY = d.source.y + Math.cos( angle ) * this.nodeSize;
                    d.targetY = d.target.y - Math.cos( angle ) * this.nodeSize;
                }.bind( this ) )
                .attr( "x1", function( d ) { return d.sourceX; } )
                .attr( "y1", function( d ) { return d.sourceY; } )
                .attr( "x2", function( d ) { return d.targetX; } )
                .attr( "y2", function( d ) { return d.targetY; } );

            node.attr( "transform", d => `translate(${d.x},${d.y})` );
            // .attr("cy", d => d.y);
        } );

        // this.simulation.alpha(1);
        // this.simulation.restart();
        for ( let i = 0, n = Math.ceil( Math.log( this.simulation.alphaMin() ) / Math.log( 1 - this.simulation.alphaDecay() ) ); i < n; ++i ) {
            this.simulation.tick();
        }
        return this.svg.node();
    }
    
    calculateDistancesFromStart() {
    	console.time('calculateDistancesFromStart');
    	let starts = this.messages.filter( m => m.hasOwnProperty('start') && m['start'] == true);
    	if (starts.length < 1) {
    		console.error("No start set");
    		return;
    	}
	    	
    	//initiate distances
    	let distances = {};
    	for(let msg of this.messages) {
//	    		distances[msg['@id']] = msg === startMsg ? 0 : null;
    		distances[msg['@id']] = null;
    	}
    	
    	let targetsPerMsg = {};
    	let sourcesPerMsg = {};
//    	console.log("dir", this.directions);
    	for(let direction of this.directions) {
    		let from = typeof direction['source'] == "string" ? direction['source'] : direction['source']['@id'];
    		let to = typeof direction['target'] == "string" ? direction['target'] : direction['target']['@id'];
    		
    		if(!targetsPerMsg.hasOwnProperty(from)) {
    			targetsPerMsg[from] = [];
    		}
    		targetsPerMsg[from].push(to);
    		

    		if(!sourcesPerMsg.hasOwnProperty(to)) {
    			sourcesPerMsg[to] = [];
    		}
    		sourcesPerMsg[to].push(from);
    	}

		let traverseMsg = function(msgId, depth, goingDown, yPos) {
			let msgsPerMsg = goingDown ? targetsPerMsg : sourcesPerMsg;
//			console.log(goingDown, msgId, depth);
			if(!msgsPerMsg.hasOwnProperty(msgId)) {
				// end of trail
				return yPos;
			}
			
			
			let i = 0, y =0;
			for(let childMsgId of msgsPerMsg[msgId]) {
				if(distances[childMsgId] !== null){
					continue;
				}
				if(distances[childMsgId] === null || (goingDown && distances[childMsgId][0] > depth)) {
					
					if(distances[childMsgId] === null) {
						if(i > 0){
							yPos++;
						}
						i++;
					
						console.log('set for id', childMsgId, goingDown, depth, yPos);
						distances[childMsgId] = [depth, yPos];

					}
					else{
						y++;
					}
//					console.log(goingDown, childMsgId, depth);
					yPos = traverseMsg(childMsgId, goingDown ? (depth+1) : (depth - 1), goingDown, yPos);
				}
				else if(!goingDown && distances[childMsgId][0] < depth) {
					if(childMsgId == 'en-njsgkr4az') {
						console.log('set for id', childMsgId, goingDown);
					}
					if(distances[childMsgId] === null) {
						distances[childMsgId] = [depth, yPos];
					}
					
//					console.log('a', depth);
					yPos = traverseMsg(childMsgId, depth - 1, goingDown, yPos);
				} else {
					// apparently, there is a loop. Don't traverse it.
				}

			}
			
//			if( i == 0 && y == 1) {
//				// we reached an item that branches back into the tree
//				return yPos -1;
//			}
//			console.log('yPos',msgId,yPos);
			return yPos;
		}
		
		let yPos = 0;
		console.time('step1');
		for(let startMsg of starts) {
			console.time('start: '+startMsg['@id']);
			if(distances[startMsg['@id']] === null) {
				distances[startMsg['@id']] = [0, yPos];
			}
			yPos = traverseMsg(startMsg['@id'], 1 , true, yPos);
			yPos += 1;
			console.timeEnd('start: '+startMsg['@id']);
		}
		console.timeEnd('step1');
		console.time('step2');
		// now we have the formal tree, lets try to polish the rest:
		for(let msgId in distances) {
			console.time('polish: '+ msgId);
			if(distances[msgId] === null) {
				continue;
			}
//			let's see if there are parent nodes that are not in the distances array
			// traverse up and see whether we encounter anything new
			traverseMsg(msgId, distances[msgId][0] -1, false, distances[msgId][1])
			console.timeEnd('polish: '+ msgId);
		}
		console.timeEnd('step2');
		
//		let additionalsDepth = 0;
////		now the secondary strands:
//		for(let msgId in distances) {
//			if(distances[msgId] !== null || sourcesPerMsg.hasOwnProperty(msgId)) {
//				// it is already calculated, or it has a parent node (which we should traverse instead)
//				continue;
//			}
//			distances[msgId] = additionalsDepth;
//			traverseMsg(msgId, additionalsDepth+1, true);
//			
//		}
		console.timeEnd("calculateDistancesFromStart");
		return distances;
    }
}
//
//class Timeline {
//	constructor(el, hugvey_ids) {
//		this.el = el;
//		this.logbook = []
//		this.hugvey_ids = hugvey_ids;
//		
//		this.el.innerHTML = "";
//		for(id of this.hugvey_ids) {
//			this.el.appendChild(crel(
//				'div', {
//					
//				}
//			));
//		}
//	}
//	
//	log(msg) {
////		{"action": "log", "id": "3", "type": "story", "info": " start"}
//		console.log('log!', msg);
//	}
//}