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    var w = 500;
    
    // The strain visualization
    var strainVis;
    
    // a map holding data sets by strain
    var dataSetsByStrain = { };
    
    // prefixes of strain names to be grouped togehter
    var STRAIN_GROUP_PREFIXES = [ "JJS-DIN", "JJS-MGP" ];
    
    // The names to show the user for the strain groups
    var STRAIN_GROUP_PREFIXES_DISPLAY_NAME = {"JJS-DIN" : "JJS-DIn", "JJS-MGP" : "JJS-MGP" };
    
    // Groups of strains to be displayed  
    var strainGroups = [];
    
    // The data set type visualization
    var dataSetTypeVis, od600View, metabolomicsView, transcriptomicsView, proteomicsView;
    
    // A map holding data sets by type
    var dataSetsByType = { };
    
    // Variables for determining if a particular object is a data set or a strain
    var typeDataSet = "DATA_SET", typeStrain = "STRAIN";
    
    var IGNORED_DATASET_TYPES = [ "EXCEL_ORIGINAL", "TSV_EXPORT", "UNKNOWN" ];
    
    //The inspected strains
    var inspected = [];
    
    //The node inspectors
    var inspectors;
    
    /** Hides the explanation and shows the element to display the explanation again */
    function hideExplanation() {
    	$('#explanation').hide();
    	$('#explanation-show').show();	
    }
    
    /** Display the explanation again */
    function showExplanation() {
    	$('#explanation-show').hide();		
    	$('#explanation').show();
    }
    
    /** Compute the dataSetsByType variable */
    function initializeDataSetsByType() {
    	// Group data sets by type
    	dataSetsByType = basynthec.dataSetList.reduce(
    		function(result, dataSet) {
    			var listForType = result[dataSet.dataSetTypeCode];
    			if (listForType == null) {
    				listForType = [];
    				result[dataSet.dataSetTypeCode] = listForType;
    			}
    			listForType.push(new DataSetWrapper(dataSet));
    			return result;
    		}, {});
    }
    
    /** Compute the dataSetsByStrain variable */
    function initializeDataSetsByStrain() {
    	// group dataSets
    	dataSetsByStrain = basynthec.dataSetList.reduce(
    		function(result, dataSet) { 
    			var uniqueStrains = uniqueElements(basynthec.getStrains(dataSet).sort());
    			
    			uniqueStrains.forEach(function(strain) {
    					if (!result[strain]) {
    						result[strain] = new StrainWrapper(strain);
    					}
    					result[strain].dataSets.push(dataSet);
    			});
    			return result;
    		}, {});
    }
    
    /**
     * Shows the list of data sets retrieved from the openBIS server.
     */
    function showDataSets(bisDataSets) {
    	if (null == bisDataSets) return;
    	
    	basynthec.dataSetList = bisDataSets.filter(function(dataSet) { 
    		return IGNORED_DATASET_TYPES.indexOf(dataSet.dataSetTypeCode) == -1;
      });
    	
    	// sort data sets
    	var sortByTypeAndRegistration = function(a, b) {
    		if (a.dataSetTypeCode == b.dataSetTypeCode) {
    			return b.registrationDetails.registrationDate - a.registrationDetails.registrationDate;
    		}
    		return (a.dataSetTypeCode < b.dataSetTypeCode) ? -1 : 1;
    	};
    	
    	basynthec.dataSetList.sort(sortByTypeAndRegistration);
    	
    	initializeDataSetsByType();
    	initializeDataSetsByStrain();
    	
    	refreshDataSetTypeTables();
    	refreshStrainTables();
    }
    
    function createStrainGroups(strains) {
    	
    	var groups = STRAIN_GROUP_PREFIXES.map(
    			function(strainPrefix) {
    				var filtered = strains.filter(function(strain) { 
    			    return strain.indexOf(strainPrefix) >= 0
    			  });
    				var groupStrains = filtered.map(function(strain) {
    					return { name : strain, label : strain.substring(strainPrefix.length)};
    			  });
    				
    				return {groupName : STRAIN_GROUP_PREFIXES_DISPLAY_NAME[strainPrefix], strains : groupStrains};
    	});
    	
    	var otherStrains = strains.filter(function(strain) {
          return false == STRAIN_GROUP_PREFIXES.some(function(prefix) { return strain.indexOf(prefix) >=0; } );
    	});
    	otherStrains = otherStrains.map(function(strain) { return {name:strain, label:strain}});
    	groups.push({groupName : "Other strains", strains : otherStrains});
    	
    	var sortFunction = sortByProp("name")
    	groups.forEach(function(group) { group.strains.sort(sortFunction); });
    
    	// only return groups that have strains
    	return groups.filter(function(group) { return group.strains.length > 0 });
    }
    
    function refreshStrainTables() {
    	var strains = []
    	for (strainName in dataSetsByStrain) {
    		strains.push(strainName)
    	}
    	strainGroups = createStrainGroups(strains);
    	
      createVis();
     	updateStrainDiagram(1000);
    }
    
    function refreshDataSetTypeTables() {
      createVis();
     	updateDataSetTypeDiagram(1000);
    }
    
    function createDataSetSummaryView(group, type, id)
    {
    	var container, result;
    	container = group.append("div");
    
    	container.append("h2").attr("class", "datasetsummarytable").text(type);
    	
    	result =  
    		container.append("div")
    			.attr("id", id)
    			.attr("class", "datasummaryview");
    			
    	return result;
    }
    
    var didCreateVis = false;
    
    function createVis()
    {
    	if (didCreateVis) return;
    	
    	var top = d3.select("#main");
    	var tableRoot = top.append("div").attr("id", "table-root").style("width", w + 5 + "px").style("float", "left");
    	
    	
    	// An element for the inspectors.
    	inspectors = top.append("span")
    		.style("width", "500px")
    		.style("position", "relative")
    		.style("overflow", "auto")
    		.style("float", "left")
    		.style("left", "20px");
    
    	// Create the dataSetType visualization
    	dataSetTypeVis = tableRoot.append("div");
    	dataSetTypeVis.style("width", w + "px");
    	od600View = createDataSetSummaryView(dataSetTypeVis, "OD600", "od600");
    	metabolomicsView = createDataSetSummaryView (dataSetTypeVis, "Metabolomics", "metabolomics");
    	transcriptomicsView = createDataSetSummaryView (dataSetTypeVis, "Transcriptomics", "transcriptomics");
    	proteomicsView = createDataSetSummaryView (dataSetTypeVis, "Proteomics", "proteomics");
    	
    	// Initially hide the strain view -- it is activated by the radio button
    	strainVis = tableRoot.append("div").style("display", "none");
    	strainVis.style("width", w + "px");
    	
    	
    	didCreateVis = true;
    }
    
    function updateDataSetTypeDiagram(duration)
    {
    	// Update the OD600 View
    	updateDataSetTypeView(od600View, "OD600");
    	updateDataSetTypeView(metabolomicsView, "METABOLITE_INTENSITIES");
    	updateDataSetTypeView(transcriptomicsView, "TRANSCRIPTOMICS");
    	updateDataSetTypeView(proteomicsView, "PROTEIN_QUANTIFICATIONS");
    }
    
    
    function updateStrainDiagram(duration)
    {
    	var strainDiv = strainVis.selectAll("div.strains").data(strainGroups)
    		.enter()
    	.append("div")
    		.attr("class", "strains");
    
    	strainDiv
    		.append("h2")
    			.text(function(d) { return d.groupName });
    	strainDiv
    		.append("table")
    			.selectAll("tr").data(function(d) { 
    					// Group the different sets of strains differently
    					if (d.groupName.indexOf("Other") == 0) return d.strains.reduce(groupBy(3), []);
    					if (d.groupName.indexOf("JJS-MGP") == 0) return d.strains.reduce(groupBy(10), []);
    				
    					// Group the JJS-DIn strains by runs
    					return d.strains.reduce(groupByRuns(10), []) })
    				.enter()
    			.append("tr")
    			.selectAll("td").data(function(d) { return d })
    				.enter()
    			.append("td")
    			.on("click", toggle_inspected)
    			.text(function(d) { return d.label });
    }
    
    function updateDataSetTypeView(aView, type)
    {
    	var dataSetsForType = dataSetsByType[type];
    	
    	if (dataSetsForType == null) {
    		aView.selectAll("p")
    			.data(["No Data"])
    		.enter()
    			.append("p")
    			.text("No Data");
    		return;
    	}
    	
    	aView.selectAll("table")
    		.data([dataSetsForType])
    	.enter()
    		.append("table")
    		.attr("class", "datasetsummarytable")
    		.selectAll("tr")
    			.data(function (d) { return d})
    		.enter()
    			.append("tr")
    			.on("click", toggle_inspected)
    				.selectAll("td")
    					.data(function (d) { return [d.dateString, d.userEmail, d.strainString] })
    				.enter()
    					.append("td")
    					.style("width", "33%")
    					.text(function (d) { return d});
    }
    
    /** Utility function to gracefully switch from one visualization to another */
    function toggleDisplayedVisualizations(visToShow, visToHide)
    {
    	visToShow
    	.style("display", "inline")
    		.transition()
    	.duration(1000)
    	.style("opacity", 1);
    	
    	visToHide
    		.transition()
    	.duration(1000)
    	.style("opacity", 0)
    	.style("display", "none");
    }
    
    /** Show the data sets grouped by type */
    function switchToDataSetTypeView()
    {
    	hideExplanation();
    	toggleDisplayedVisualizations(dataSetTypeVis, strainVis);
    }
    
    /** Show the data sets by strain*/
    function switchToStrainView()
    {
    	hideExplanation();
    	toggleDisplayedVisualizations(strainVis, dataSetTypeVis);
    }
    
    /**
     * Draw / update node inspectors
     */
    function updateInspectors(duration)
    {	
    	var inspector = inspectors.selectAll("div.inspector").data(inspected, function (d) { return d.name });
    	
    	var box = inspector.enter().append("div")
    		.attr("class", "inspector")
    		.text(function(d) { return d.name });
    
    	box.append("span")
    		.attr("class", "close")
    		.on("click", toggle_inspected)
    		.text("x");
    	
    	var dataSetList = inspector.selectAll("ul").data(function (d) { return [d] });
    	dataSetList.enter()
    	  .append("ul")
    	  .attr('class', 'dataSets');
    	
    	
    	var dataSetElt = dataSetList.selectAll("li").data(function (d) { return d.dataSets });
    	dataSetElt.enter()
    	  .append("li")
    	  .text(function(d) { return dataSetLabel(d) });
    	
    	var dataSetDetailsElt = dataSetElt.selectAll("div.dataSetDetails").data(function(d) { return [d]; });
    	dataSetDetailsElt
    	  .enter()
    	    .append("div")
    	      .attr("class", "dataSetDetails"); 
    	
    	var propsTable = dataSetDetailsElt.selectAll("table.properties").data(function(d) {return [d]});
    	
    	propsTable.enter()
    	  .append("table")
    	  .attr("class", "properties");
    	
    	propsTable.selectAll("tr").data(function(d) { return props_to_pairs(d.bis.properties) })
    		.enter()
    			.append("tr")
    			.selectAll("td").data(function(d) { return d } ).enter()
    				.append("td")
    				.attr("class", function(d, i) { return (i == 0) ? "propkey" : "propvalue"})
    				.style("opacity", "0")
    				.text(function(d) { return d })
    			.transition()
    				.style("opacity", "1");
    	
    	var downloadTable = dataSetDetailsElt.selectAll("table.downloads").data(function(d) { return [d] });
    	
    	downloadTable
    		.enter()
    			.append("table")
    				.attr("class", "downloads")
    			
    	// Add a caption, but make sure there is just one (this does not work with select())
    	downloadTable.selectAll("caption").data(["Files"])
    		.enter()
    			.append("caption").text(function(d) { return d; });
    			
    	// We just want to see non-directories here
    	var downloadTableRow = downloadTable.selectAll("tr").data(filesForDataSet, function(d) { return d.pathInDataSet });
    	downloadTableRow
    		.enter()
    			.append("tr")
    				.append("td")
    				.on("click", downloadTableFile)
    				.text(function(d) { return d.pathInListing });
    	downloadTableRow
    		.exit()
    			.transition()
    				.duration(duration)
    				.style("opacity", "0")
    				.remove();
    				
    	var height = 200, width = 200;
    	var dataDisplay = dataSetDetailsElt.selectAll("svg").data(od600DataForDataSet);
    	dataDisplay
    		.enter()
    	.append("svg:svg")
    		.attr("height", height)
    		.attr("width", width);
    	// Reinitialize the variable
    	dataDisplay = dataSetDetailsElt.selectAll("svg").data(od600DataForDataSet);
    	var aCurve = dataDisplay.selectAll("g").data(function(d) { return [d[1]]; })
    				.enter()
    			.append("svg:g");
    	// Reinitialize the variable
    	aCurve = dataDisplay.selectAll("g").data(curveData);
    		// The first two columns of data are the strain name and human-readable desc
    	aCurve.selectAll("line").data(lineData)
    		.enter()
    	.append("svg:line")
    		.attr("x1", function(d, i) { return (i / (this.parentNode.__data__.length)) * width; })
    		.attr("y1", function(d, i) { return height - (d[0] * height); })
    		.attr("x2", function(d, i) { return ((i + 1) / (this.parentNode.__data__.length)) * width;})
    		.attr("y2", function(d) { return height - (d[1] * height); })
    		.style("stroke", "rgb(0,0,0)")
    		.style("stroke-width", "1");
    	
    	inspector.exit().transition()
    		.duration(duration)
    		.style("opacity", "0")
    		.remove();
    }
    
    function downloadTableFile(d)
    {
    	// If there is no dataset, this is just a marker for loading
    	if (!d.dataset) return;
    	
    	var action = function(data) { 
    		try {
    			document.location.href = data.result
    		} catch (err) {
    			// just ignore errors		
    		} 
    	};
    	basynthec.server.getDownloadUrlForFileForDataSet(d.dataset.bis.code, d.pathInDataSet, action);
    }
    
    function dataSetLabel(d) {
    	return d.bis.dataSetTypeCode + " registered on " + timeformat(new Date(d.bis.registrationDetails.registrationDate)); 
    }
    
    function classForNode(d) { 
    	return  (d.inspected) ? "inspected" : "";
    }
    
    function toggle_inspected(d) {
    	hideExplanation();
    
    	if (d.inspected) {
    		var index = inspected.indexOf(d) 
    		if (index > -1)	inspected.splice(index, 1);
    		d.inspected = false;
    	} else {
    		d.inspected = true;
    		d.strainNode = this;
    		inspected.push(d);
    		if (d.type === typeDataSet) {
    			d.dataSets = [{ bis : d.dataSet }];
    			retrieveFilesForDataSets(d.dataSets);
    		} else if (!d.dataSets) {
    			d.dataSets = dataSetsByStrain[d.name].dataSets.map(function(ds){ return {bis : ds} }); 
    			retrieveFilesForDataSets(d.dataSets);
    		}
    	}
    	
    	d3.select(d.strainNode).attr("class", classForNode(d))
      updateInspectors(500);
    }
    
    function filesForDataSet(d)
    {
    	if (d.loadingFiles) return [{ pathInListing : "Loading..." }];
    	
    	var fileFilter = function(file) {
    		if (!file.isDirectory) {
    			if (endsWith(file.pathInDataSet, "xls")) {
    				return true;
    			}
    			if (endsWith(file.pathInDataSet, "xls.tsv")) {
    				return true;
    			}
    		}
    		return false;
    	};
    	
    	return (d.files) ? d.files.filter(fileFilter) : [];
    }
    
    function retrieveFilesForDataSets(dataSets)
    {
    	dataSets.forEach(function(ds) {
    		   retrieveFilesForDataSet(ds);
    	});	
    }
    
    function retrieveFilesForDataSet(ds)
    {
    	if (ds.files) {
    		// already retrieved
    		return;
    	}
    	
    	ds.loadingFiles = true;
    	ds.files = [];
    
    	basynthec.server.listFilesForDataSet(ds.bis.code, "/", true, function(data) {					
    		if (!data.result) { 
    			return;
    		}
    		data.result.forEach(function (file) { file.dataset = ds });
    		ds.files = ds.files.concat(data.result);
    		
    		ds.loadingFiles = false; 
    		updateInspectors(500);
    		
    		if (isOd600DataSet(ds)) {
    			retrieveOd600DataForDataSet(ds)
    		}
    				
    	});
    }
    
    function isOd600DataSet(d) { return "OD600" == d.bis.dataSetTypeCode}
    
    function od600DataForDataSet(d)
    {
    	if (!isOd600DataSet(d)) return [];
    
    	if (undefined == d.od600) return [[]];
    	
    	return [d.od600.slice(1)];
    //		return [d.od600[1]];
    }
    
    /** 
     * Load the OD600 data from the server. This function assumes that the files are already known.
     */
    function retrieveOd600DataForDataSet(ds)
    {
    	if (ds.od600) {
    		// already retrieved
    		return;
    	}
    	
    	ds.loadingOd600 = true;
    	ds.od600 = [];
    	
    	// Figure out the path to the multistrain TSV file -- this path ends with "xls.tsv".
    	var tsvPathInDataSet = "";
    	ds.files.forEach(function (file) { if (endsWith(file.pathInDataSet, "xls.tsv")) tsvPathInDataSet = file.pathInDataSet});
    		
    	var tsvUrl = dssUrl + "/" + ds.bis.code + "/" + tsvPathInDataSet + "?sessionID=" + basynthec.server.sessionToken;
    
    	d3.text(tsvUrl, "text/tsv", function(text) {
    		var rows = d3.tsv.parseRows(text, "\t");
    		
    		ds.od600 = rows;
    		ds.loadingOd600 = false; 
    		updateInspectors(500);
    	});	
    }
    
    function curveData(d)
    {
    	if (!d) return [];
    	if (d.length < 2) return [];
    	var data = d[1].slice(2);
    	return [{length : data.length, max : d3.max(data), values: data}]
    }
    
    function lineData(d)
    {
    	if (!d) return [];
    	
    	var data = d.values;
    	// convert the data into pairs
    	var pairs = data.reduce(function(sum, elt) {
    		// initialization
    		if (sum.length < 1) {
    			sum.push([elt / d.max]);
    			return sum;
    		}
    		
    		// add the current elt as the second in the last pair and the first in the new pair
    		sum[sum.length - 1].push(elt / d.max);
    		// don't add the very last element
    		if (sum.length < data.length - 1) sum.push([elt / d.max]);
    		return sum;
    	}, []);
    	
    	return pairs;
    }
    
    function shouldRenderProperty(prop, value) {
    	if (prop == STRAIN_PROP_NAME) {
    		// strain properties are dealt with separately
    		return false;
    	}
    	if (!value) {
    		// do not show properties with no values
    		return false;
    	}
    	return true;
    }
    
    /**
     * Convert properties to pairs
     */
    function props_to_pairs(d)
    {
    	var pairs = [];
    	
    	var dataSetStrains = basynthec.getStrains({properties:d});
    	var strainGroups = createStrainGroups(dataSetStrains);
    	
    	strainGroups.forEach(function(group) {
    		var shortedStrains = group.strains.map(function(elt) { return elt.label; });
    		shortedStrains = uniqueElements(shortedStrains.sort())
    		var pair = [ group.groupName, shortedStrains.join(" ") ];
    		pairs.push(pair)
    	});
    	
    	for (var prop in d) {
    		if (shouldRenderProperty(prop, d[prop])) {
    			var pair = [prop, d[prop]];
    			pairs.push(pair);
    	  }
    	}
    	pairs.sort(function(a, b) { 
    		if (a[0] == b[0]) return 0;
    		// Sort in reverse lexicographical
    		return (a[0] < b[0]) ? -1 : 1;
    	});
    	return pairs;
    }
    
    function enterApp()
    {
    	$("#login-form-div").hide();
    	$("#main").show();
    	basynthec.listAllDataSets(function(data) { 
    		showDataSets(data.result); 
    	});
    	
    	$('#openbis-logo').height(50)
    	
    }
    
    function groupBy(numElts)
    {
    	var groupBy = function(groups, elt) {
    		if (groups.length < 1) {
    			groups.push([elt]);
    			return groups;
    		}
    		
    		var lastGrp = groups[groups.length - 1];
    		if (lastGrp.length < numElts) {
    			lastGrp.push(elt);
    		} else {
    			groups.push([elt]);
    		}
    	
    		return groups;
    	}
    	return groupBy;
    }
    
    /**
     * Check if the current elt number = last elt number + 1
     */
    function isRun(lastElt, currentElt) {
    	var lastNumber = Number(lastElt.label);
    	var currentNumber = Number(currentElt.label);
    	// Assume that non numeric values are runs
    	if (lastNumber == NaN || currentNumber == NaN) return true;
    	
    	return currentNumber == (lastNumber + 1);
    }
    
    function groupByRuns(maxNumEltsPerGroup)
    {
      var lastSeen = "";
    	var groupBy = function(groups, elt) {
    		// Initialize the groups
    		if (groups.length < 1) { groups.push([elt]); return groups; }
    
    		// Check if we should append to the last group or create a new one
    		var lastGrp = groups[groups.length - 1];
    		var createNewGroup = false;
    		if (lastGrp.length >= maxNumEltsPerGroup) {
    			// We've reached the size limit of the group
    			createNewGroup = true;
    		} else {
    			// See if this is a run, if not create a new group
    			createNewGroup = !isRun(lastGrp[lastGrp.length - 1], elt);
    		}
    
    		(createNewGroup) ? groups.push([elt]) : lastGrp.push(elt);
    	
    		return groups;
    	}
    	return groupBy;
    }