text: var page_is_visible = 1;
  
  var TARGET_THUMB_GRAPH_WIDTH = 500;		// thumb charts width will range from 0.5 to 1.5 of that
  var MINIMUM_THUMB_GRAPH_WIDTH = 400;	// thumb chart will generally try to be wider than that
  var TARGET_THUMB_GRAPH_HEIGHT = 160;	// the height of the thumb charts
  var TARGET_GROUP_GRAPH_HEIGHT = 160;
  
  var THUMBS_MAX_TIME_TO_SHOW = 240;		// how much time the thumb charts will present?
  var THUMBS_POINTS_DIVISOR = 3;
  var THUMBS_STACKED_POINTS_DIVISOR = 4;
  
  var GROUPS_MAX_TIME_TO_SHOW = 600;		// how much time the group charts will present?
  var GROUPS_POINTS_DIVISOR = 2;
  var GROUPS_STACKED_POINTS_DIVISOR = 3;
  
  var MAINCHART_MIN_TIME_TO_SHOW = 1200;	// how much time the main chart will present by default?
  var MAINCHART_POINTS_DIVISOR = 2;		// how much detailed will the main chart be by default? 1 = finest, higher is faster
  var MAINCHART_STACKED_POINTS_DIVISOR = 3;		// how much detailed will the main chart be by default? 1 = finest, higher is faster
  
  var MAINCHART_CONTROL_HEIGHT = 75;		// how tall the control chart will be
  var MAINCHART_CONTROL_DIVISOR = 5;		// how much detailed will the control chart be? 1 = finest, higher is faster
  var MAINCHART_INITIAL_SELECTOR= 20;		// 1/20th of the width, this overrides MAINCHART_MIN_TIME_TO_SHOW
  
  var CHARTS_REFRESH_LOOP = 50;			// delay between chart refreshes
  var CHARTS_REFRESH_IDLE = 500;			// delay between chart refreshes when no chart was ready for refresh the last time
  var CHARTS_CHECK_NO_FOCUS = 500;		// delay to check for visibility when the page has no focus
  var CHARTS_SCROLL_IDLE = 100;			// delay to wait after a page scroll
  
  var ENABLE_CURVE = 1;
  
  var resize_request = false;
  
  function setPresentationNormal(ui) {
  	THUMBS_POINTS_DIVISOR 				= 3;
  	THUMBS_STACKED_POINTS_DIVISOR 		= Math.round(THUMBS_POINTS_DIVISOR * 1.5);
  	GROUPS_POINTS_DIVISOR 				= 2;
  	GROUPS_STACKED_POINTS_DIVISOR 		= Math.round(GROUPS_POINTS_DIVISOR * 1.5);
  	MAINCHART_POINTS_DIVISOR 			= 2;
  	MAINCHART_STACKED_POINTS_DIVISOR 	= Math.round(MAINCHART_POINTS_DIVISOR * 1.5);
  	ENABLE_CURVE = 1;
  	CHARTS_REFRESH_LOOP = 50;
  	CHARTS_SCROLL_IDLE = 50;
  	resize_request = true;
  	if(ui) $('#presentation_normal').trigger('click');
  	playGraphs();
  }
  function setPresentationSpeedy(ui) {
  	THUMBS_POINTS_DIVISOR 				= 10;
  	THUMBS_STACKED_POINTS_DIVISOR 		= Math.round(THUMBS_POINTS_DIVISOR * 1.5);
  	GROUPS_POINTS_DIVISOR 				= 8;
  	GROUPS_STACKED_POINTS_DIVISOR 		= Math.round(GROUPS_POINTS_DIVISOR * 1.5);
  	MAINCHART_POINTS_DIVISOR 			= 5;
  	MAINCHART_STACKED_POINTS_DIVISOR 	= Math.round(MAINCHART_POINTS_DIVISOR * 1.5);
  	ENABLE_CURVE = 0;
  	CHARTS_REFRESH_LOOP = 50;
  	CHARTS_SCROLL_IDLE = 100;
  	resize_request = true;
  	if(ui) $('#presentation_speedy').trigger('click');
  	playGraphs();
  }
  function setPresentationDetailed(ui) {
  	THUMBS_POINTS_DIVISOR 				= 1;
  	THUMBS_STACKED_POINTS_DIVISOR 		= 1;
  	GROUPS_POINTS_DIVISOR 				= 1;
  	GROUPS_STACKED_POINTS_DIVISOR 		= 1;
  	MAINCHART_POINTS_DIVISOR 			= 1;
  	MAINCHART_STACKED_POINTS_DIVISOR 	= 1;
  	ENABLE_CURVE = 1;
  	CHARTS_REFRESH_LOOP = 50;
  	CHARTS_SCROLL_IDLE = 50;
  	resize_request = true;
  	if(ui) $('#presentation_detailed').trigger('click');
  	playGraphs();
  }
  
  function isIE() {
    userAgent = navigator.userAgent;
    return userAgent.indexOf("MSIE ") > -1 || userAgent.indexOf("Trident/") > -1;
  }
  
  if(isIE()){
  	// do stuff with ie-users
  	CHARTS_REFRESH_LOOP=250;
  	CHARTS_SCROLL_IDLE=500;
  }
  
  var MODE_THUMBS = 1;
  var MODE_MAIN = 2;
  var MODE_GROUP_THUMBS = 3;
  var mode; // one of the MODE_* values
  
  var allCharts = new Array();
  var mainchart;
  
  // html for the main menu
  var mainmenu = "";
  var categoriesmainmenu = "";
  var familiesmainmenu = "";
  var chartsmainmenu = "";
  
  
  // ------------------------------------------------------------------------
  // common HTML generation
  
  function thumbChartActions(i, c, nogroup) {
  	var name = c.name;
  	if(!nogroup) name = c.family;
  
  	var refinfo = "the chart is drawing ";
  	if(c.group == 1) refinfo += "every single point collected (" + c.update_every + "s each).";
  	else refinfo += ((c.group_method == "average")?"the average":"the max") + " value for every " + (c.group * c.update_every) + " seconds of data";
  
  	var html = "<div class=\"btn-group btn-group\" data-toggle=\"tooltip\" data-placement=\"top\" title=\"" + refinfo + "\">"
  	+		"<button type=\"button\" class=\"btn btn-default\" onclick=\"javascript: return;\"><span class=\"glyphicon glyphicon-info-sign\"></span></button>"
  	+	"</div>"
  	+	"<div class=\"btn-group btn-group\"><button type=\"button\" class=\"btn btn-default disabled\"><small>&nbsp;&nbsp; " + name + "</small></button>";
  
  	if(!nogroup) {
  		var ingroup = 0;
  		var ingroup_detail = 0;
  
  		$.each(allCharts, function(i, d) {
  			if(d.family == c.family) {
  				ingroup++;
  				if(d.isdetail) ingroup_detail++;
  			}
  		});
  
  		var hidden = "";
  		if(ingroup_detail) hidden = ", including " + ingroup_detail + " charts not shown now";
  
  		html += "<button type=\"button\" data-toggle=\"tooltip\" data-placement=\"top\" title=\"Show all " + ingroup + " charts in group '" + c.family + "'" + hidden + "\" class=\"btn btn-default\" onclick=\"initGroupGraphs('" + c.family +"');\"><span class=\"glyphicon glyphicon-th-large\"></span></button>";
  	}
  
  	html += "<button type=\"button\" data-toggle=\"tooltip\" data-placement=\"top\" title=\"show chart '" + c.name + "' in fullscreen\" class=\"btn btn-default\" onclick=\"initMainChartIndex(" + i +");\"><span class=\"glyphicon glyphicon-resize-full\"></span></button>"
  	+		"<button type=\"button\" data-toggle=\"tooltip\" data-placement=\"top\" title=\"set options for chart '" + c.name + "'\" class=\"btn btn-default disabled\" onclick=\"alert('Not implemented yet!');\"><span class=\"glyphicon glyphicon-cog\"></span></button>"
  	+		"<button type=\"button\" data-toggle=\"tooltip\" data-placement=\"top\" title=\"ignore chart '" + c.name + "'\" class=\"btn btn-default\" onclick=\"disableChart(" + i + ");\"><span class=\"glyphicon glyphicon-trash\"></span></button>"
  	+	"</div>";
  
  	return html;
  }
  
  function groupChartActions(i, c) {
  	var name = c.name;
  
  	var refinfo = "the chart is drawing ";
  	if(c.group == 1) refinfo += "every single point collected (" + c.update_every + "s each).";
  	else refinfo += ((c.group_method == "average")?"the average":"the max") + " value for every " + (c.group * c.update_every) + " seconds of data";
  
  	var html = "<div class=\"btn-group btn-group\" data-toggle=\"tooltip\" data-placement=\"left\" title=\"" + refinfo + "\">"
  	+		"<button type=\"button\" class=\"btn btn-default\" onclick=\"javascript: return;\"><span class=\"glyphicon glyphicon-info-sign\"></span></button>"
  	+	"</div>";
  
  	html += "<button type=\"button\" data-toggle=\"tooltip\" data-placement=\"left\" title=\"show chart '" + c.name + "' in fullscreen\" class=\"btn btn-default\" onclick=\"initMainChartIndex(" + i +");\"><span class=\"glyphicon glyphicon-resize-full\"></span></button>"
  	+		"<button type=\"button\" data-toggle=\"tooltip\" data-placement=\"left\" title=\"ignore chart '" + c.name + "'\" class=\"btn btn-default\" onclick=\"disableChart(" + i + ");\"><span class=\"glyphicon glyphicon-trash\"></span></button>"
  	+	"</div>";
  
  	return html;
  }
  
  function mylog(txt) {
  	console.log(txt);
  	$('#logline').html(txt);
  }
  
  function chartssort(a, b) {
  	if(a.priority == b.priority) {
  		if(a.name < b.name) return -1;
  	}
  	else if(a.priority < b.priority) return -1;
  
  	return 1;
  }
  
  
  // ------------------------------------------------------------------------
  // MAINGRAPH = fullscreen view of 1 graph
  
  // copy the chart c to mainchart
  // switch to main graphs screen
  function initMainChart(c) {
  	if(mainchart) cleanThisChart(mainchart);
  
  	mainchart = $.extend(true, {}, c);
  	mainchart.enabled = true;
  	mainchart.refreshCount = 0;
  	mainchart.last_updated = 0;
  	mainchart.chartOptions.explorer = null;
  	mainchart.chart = null;
  
  	mainchart.before = 0;
  	mainchart.after = 0;
  
  	mainchart.chartOptions.width = screenWidth();
  	mainchart.chartOptions.height = $(window).height() - 150 - MAINCHART_CONTROL_HEIGHT;
  	if(mainchart.chartOptions.height < 300) mainchart.chartOptions.height = 300;
  
  	mainchart.div = 'maingraph';
  	mainchart.max_time_to_show = (mainchart.last_entry_t - mainchart.first_entry_t) / ( MAINCHART_INITIAL_SELECTOR * mainchart.update_every );
  	if(mainchart.max_time_to_show < MAINCHART_MIN_TIME_TO_SHOW) mainchart.max_time_to_show = MAINCHART_MIN_TIME_TO_SHOW;
  	calculateChartPointsToShow(mainchart, mainchart.chartOptions.isStacked?MAINCHART_STACKED_POINTS_DIVISOR:MAINCHART_POINTS_DIVISOR, mainchart.max_time_to_show, 0, ENABLE_CURVE);
  
  	// copy it to the hidden chart
  	mainchart.hiddenchart = $.extend(true, {}, mainchart);
  	mainchart.hiddenchart.chartOptions.height = MAINCHART_CONTROL_HEIGHT;
  	mainchart.hiddenchart.div = 'maingraph_control';
  	mainchart.hiddenchart.non_zero = 0;
  
  	// initialize the div
  	showChartIsLoading(mainchart.div, mainchart.name, mainchart.chartOptions.width, mainchart.chartOptions.height);
  	document.getElementById(mainchart.hiddenchart.div).innerHTML = "<table><tr><td align=\"center\" width=\"" + mainchart.hiddenchart.chartOptions.width + "\" height=\"" + mainchart.hiddenchart.chartOptions.height + "\" style=\"vertical-align:middle\"><h4><span class=\"label label-default\">Please wait...</span></h4></td></tr></table>";
  	//showChartIsLoading(mainchart.hiddenchart.div, mainchart.hiddenchart.name, mainchart.hiddenchart.chartOptions.width, mainchart.hiddenchart.chartOptions.height);
  
  	// set the radio buttons
  	setMainChartGroupMethod(mainchart.group_method, 'no-refresh');
  	setMainChartMax('normal');
  
  	$('#group' + mainchart.group).trigger('click');
  	setMainChartGroup(mainchart.group, 'no-refresh');
  
  	switchToMainGraph();
  }
  
  function refreshHiddenChart(doNext) {
  	if(refresh_mode == REFRESH_PAUSED && mainchart.hiddenchart.last_updated != 0) {
  		if(typeof doNext == "function") doNext();
  		return;
  	}
  
  	// is it too soon for a refresh?
  	var now = new Date().getTime();
  	if((now - mainchart.hiddenchart.last_updated) < (mainchart.update_every * 10 * 1000) || (now - mainchart.hiddenchart.last_updated) < (mainchart.hiddenchart.group * mainchart.hiddenchart.update_every * 1000)) {
  		if(typeof doNext == "function") doNext();
  		return;
  	}
  
  	if(mainchart.dashboard && mainchart.hiddenchart.refreshCount > 50) {
  		mainchart.dashboard.clear();
  		mainchart.control_wrapper.clear();
  		mainchart.hidden_wrapper.clear();
  
  		mainchart.dashboard = null;
  		mainchart.control_wrapper = null;
  		mainchart.hidden_wrapper = null;
  		mainchart.hiddenchart.last_updated = 0;
  	}
  
  	if(!mainchart.dashboard) {
  		var controlopts = $.extend(true, {}, mainchart.chartOptions, {
  			lineWidth: 1,
  			height: mainchart.hiddenchart.chartOptions.height,
  			chartArea: {'width': '98%'},
  			hAxis: {'baselineColor': 'none', viewWindowMode: 'maximized', gridlines: { count: 0 } },
  			vAxis: {'title': null, gridlines: { count: 0 } },
  		});
  
  		mainchart.dashboard = new google.visualization.Dashboard(document.getElementById('maingraph_dashboard'));
  		mainchart.control_wrapper = new google.visualization.ControlWrapper({
  			controlType: 'ChartRangeFilter',
  			containerId: 'maingraph_control',
  			options: {
  				filterColumnIndex: 0,
  				ui: {
  					chartType: mainchart.chartType,
  					chartOptions: controlopts,
  					minRangeSize: (mainchart.max_time_to_show * 1000) / MAINCHART_POINTS_DIVISOR,
  				}
  			},
  		});
  		mainchart.hidden_wrapper = new google.visualization.ChartWrapper({
  			chartType: mainchart.chartType,
  			containerId: 'maingraph_hidden',
  			options: {
  				isStacked: mainchart.chartOptions.isStacked,
  				width: mainchart.hiddenchart.chartOptions.width,
  				height: mainchart.hiddenchart.chartOptions.height,
  				//chartArea: {'height': '80%', 'width': '100%'},
  				//hAxis: {'slantedText': false},
  				//legend: {'position': 'none'}
  			},
  		});
  
  		mainchart.hiddenchart.refreshCount = 0;
  	}
  
  	// load the data for the control and the hidden wrappers
  	// calculate the group and points to show for the control chart
  	calculateChartPointsToShow(mainchart.hiddenchart, MAINCHART_CONTROL_DIVISOR, 0, -1, ENABLE_CURVE);
  
  	$.ajax({
  		url: generateChartURL(mainchart.hiddenchart),
  		dataType:"json",
  		cache: false
  	})
  	.done(function(jsondata) {
  		if(!jsondata || jsondata.length == 0) return;
  
  		mainchart.control_data = new google.visualization.DataTable(jsondata);
  
  		if(mainchart.hiddenchart.last_updated == 0) {
  			google.visualization.events.addListener(mainchart.control_wrapper, 'ready', mainchartControlReadyEvent);
  			mainchart.dashboard.bind(mainchart.control_wrapper, mainchart.hidden_wrapper);
  		}
  		if(refresh_mode != REFRESH_PAUSED) {
  			// console.log('mainchart.points_to_show: ' + mainchart.points_to_show + ', mainchart.group: ' + mainchart.group + ', mainchart.update_every: ' + mainchart.update_every);
  
  			var start = now - (mainchart.points_to_show * mainchart.group * mainchart.update_every * 1000);
  			var end = now;
  			var min = MAINCHART_MIN_TIME_TO_SHOW * 1000;
  			if(end - start < min) start = end - min;
  
  			mainchart.control_wrapper.setState({range: {
  				start: new Date(start),
  				end: new Date(end)
  			},
  			ui: {
  				minRangeSize: min
  			}});
  		}
  
  		mainchart.dashboard.draw(mainchart.control_data);
  		mainchart.hiddenchart.last_updated = new Date().getTime();
  		mainchart.hiddenchart.refreshCount++;
  	})
  	.always(function() {
  		if(typeof doNext == "function") doNext();
  	});
  }
  
  function mainchartControlReadyEvent() {
  	google.visualization.events.addListener(mainchart.control_wrapper, 'statechange', mainchartControlStateHandler);
  	//mylog(mainchart);
  }
  
  function mainchartControlStateHandler() {
  	// setMainChartPlay('pause');
  
  	var state = mainchart.control_wrapper.getState();
  	mainchart.after = Math.round(state.range.start.getTime() / 1000);
  	mainchart.before = Math.round(state.range.end.getTime() / 1000);
  
  	calculateChartPointsToShow(mainchart, mainchart.chartOptions.isStacked?MAINCHART_STACKED_POINTS_DIVISOR:MAINCHART_POINTS_DIVISOR, mainchart.before - mainchart.after, 0, ENABLE_CURVE);
  	//mylog('group = ' + mainchart.group + ', points_to_show = ' + mainchart.points_to_show + ', dt = ' + (mainchart.before - mainchart.after));
  
  	$('#group' + mainchart.group).trigger('click');
  	mainchart.last_updated = 0;
  
  	if(refresh_mode != REFRESH_PAUSED) pauseGraphs();
  }
  
  function initMainChartIndex(i) {
  	if(mode == MODE_GROUP_THUMBS)
  		initMainChart(groupCharts[i]);
  
  	else if(mode == MODE_THUMBS)
  		initMainChart(allCharts[i]);
  
  	else
  		initMainChart(allCharts[i]);
  }
  
  function initMainChartIndexOfMyCharts(i) {
  	initMainChart(allCharts[i]);
  }
  
  var last_main_chart_max='normal';
  function setMainChartMax(m) {
  	if(!mainchart) return;
  
  	if(m == 'toggle') {
  		if(last_main_chart_max == 'maximized') m = 'normal';
  		else m = 'maximized';
  	}
  
  	if(m == "maximized") {
  		mainchart.chartOptions.theme = 'maximized';
  		//mainchart.chartOptions.axisTitlesPosition = 'in';
  		//mainchart.chartOptions.legend = {position: 'none'};
  		mainchart.chartOptions.hAxis.title = null;
  		mainchart.chartOptions.hAxis.viewWindowMode = 'maximized';
  		mainchart.chartOptions.vAxis.viewWindowMode = 'maximized';
  		mainchart.chartOptions.chartArea = {'width': '98%', 'height': '100%'};
  	}
  	else {
  		mainchart.chartOptions.hAxis.title = null;
  		mainchart.chartOptions.theme = null;
  		mainchart.chartOptions.hAxis.viewWindowMode = null;
  		mainchart.chartOptions.vAxis.viewWindowMode = null;
  		mainchart.chartOptions.chartArea = {'width': '80%', 'height': '90%'};
  	}
  	$('.mainchart_max_button').button(m);
  	last_main_chart_max = m;
  	mainchart.last_updated = 0;
  }
  
  function setMainChartGroup(g, norefresh) {
  	if(!mainchart) return;
  
  	mainchart.group = g;
  
  	if(!mainchart.before && !mainchart.after)
  		calculateChartPointsToShow(mainchart, mainchart.chartOptions.isStacked?MAINCHART_STACKED_POINTS_DIVISOR:MAINCHART_POINTS_DIVISOR, mainchart.max_time_to_show, mainchart.group, ENABLE_CURVE);
  	else
  		calculateChartPointsToShow(mainchart, mainchart.chartOptions.isStacked?MAINCHART_STACKED_POINTS_DIVISOR:MAINCHART_POINTS_DIVISOR, 0, mainchart.group, ENABLE_CURVE);
  
  	if(!norefresh) {
  		mainchart.last_updated = 0;
  	}
  }
  
  var last_main_chart_avg = null;
  function setMainChartGroupMethod(g, norefresh) {
  	if(!mainchart) return;
  
  	if(g == 'toggle') {
  		if(last_main_chart_avg == 'max') g = 'average';
  		else g = 'max';
  	}
  
  	mainchart.group_method = g;
  
  	$('.mainchart_avg_button').button(g);
  
  	if(!norefresh) {
  		mainchart.last_updated = 0;
  	}
  
  	last_main_chart_avg = g;
  }
  
  function setMainChartPlay(p) {
  	if(!mainchart) return;
  
  	if(p == 'toggle') {
  		if(refresh_mode != REFRESH_ALWAYS) p = 'play';
  		else p = 'pause';
  	}
  
  	if(p == 'play') {
  		//mainchart.chartOptions.explorer = null;
  		mainchart.after = 0;
  		mainchart.before = 0;
  		calculateChartPointsToShow(mainchart, mainchart.chartOptions.isStacked?MAINCHART_STACKED_POINTS_DIVISOR:MAINCHART_POINTS_DIVISOR, mainchart.max_time_to_show, 0, ENABLE_CURVE);
  		$('#group' + mainchart.group).trigger('click');
  		mainchart.last_updated = 0;
  		mainchart.hiddenchart.last_updated = 0;
  		playGraphs();
  	}
  	else {
  		//mainchart.chartOptions.explorer = {
  		//	'axis': 'horizontal',
  		//	'maxZoomOut': 1,
  		//};
  		//mainchart.last_updated = 0;
  
  		//if(!renderChart(mainchart, pauseGraphs))
  		pauseGraphs();
  	}
  }
  
  function buttonGlobalPlayPause(p) {
  	if(mode == MODE_MAIN) {
  		setMainChartPlay(p);
  		return;
  	}
  
  	if(p == 'toggle') {
  		if(refresh_mode != REFRESH_ALWAYS) p = 'play';
  		else p = 'pause';
  	}
  
  	if(p == 'play') playGraphs();
  	else pauseGraphs();
  }
  
  
  // ------------------------------------------------------------------------
  // Chart resizing
  
  function screenWidth() {
  	return (($(window).width() * 0.95) - 50);
  }
  
  // calculate the proper width for the thumb charts
  function thumbWidth() {
  	var cwidth = screenWidth();
  	var items = Math.round(cwidth / TARGET_THUMB_GRAPH_WIDTH);
  	if(items < 1) items = 1;
  
  	if(items > 1 && (cwidth / items) < MINIMUM_THUMB_GRAPH_WIDTH) items--;
  
  	return Math.round(cwidth / items) - 1;
  }
  
  function groupChartSizes() {
  	var s = { width: screenWidth(), height: TARGET_GROUP_GRAPH_HEIGHT };
  
  	var count = 0;
  	if(groupCharts) $.each(groupCharts, function(i, c) {
  		if(c.enabled) count++;
  	});
  
  	if(count == 0) {
  		s.width = TARGET_GROUP_GRAPH_HEIGHT;
  		s.height = TARGET_GROUP_GRAPH_HEIGHT;
  	}
  	else {
  		if(s.width < MINIMUM_THUMB_GRAPH_WIDTH) s.width = screenWidth();
  		s.height = ($(window).height() - 130) / count - 10;
  	}
  
  	if(s.height < TARGET_GROUP_GRAPH_HEIGHT)
  		s.height = TARGET_GROUP_GRAPH_HEIGHT;
  
  	return s;
  }
  
  // resize all charts
  // if the thumb charts need resize in their width, reset them
  function resizeCharts() {
  	var width = screenWidth();
  
  	if(mainchart) {
  		mainchart.chartOptions.width = width;
  		mainchart.chartOptions.height = $(window).height() - 150 - MAINCHART_CONTROL_HEIGHT;
  		mainchart.last_updated = 0;
  
  		mainchart.hidden_wrapper.setOption('width', width);
  		mainchart.control_wrapper.setOption('ui.chartOptions.width', width);
  		mainchart.hiddenchart.chartOptions.width = width;
  		mainchart.hiddenchart.last_updated = 0;
  	}
  
  	width = thumbWidth();
  	$.each(allCharts, function(i, c) {
  		if(c.enabled) {
  			cleanThisChart(c);
  			c.chartOptions.width = width;
  			calculateChartPointsToShow(c, c.chartOptions.isStacked?THUMBS_STACKED_POINTS_DIVISOR:THUMBS_POINTS_DIVISOR, THUMBS_MAX_TIME_TO_SHOW, -1, ENABLE_CURVE);
  			showChartIsLoading(c.div, c.name, c.chartOptions.width, c.chartOptions.height);
  			document.getElementById(c.id + '_thumb_actions_div').innerHTML = thumbChartActions(i, c);
  			c.last_updated = 0;
  		}
  	});
  
  	if(groupCharts) $.each(groupCharts, function(i, c) {
  		var sizes = groupChartSizes();
  
  		if(c.enabled) {
  			cleanThisChart(c);
  			c.chartOptions.width = sizes.width;
  			c.chartOptions.height = sizes.height;
  			calculateChartPointsToShow(c, c.chartOptions.isStacked?GROUPS_STACKED_POINTS_DIVISOR:GROUPS_POINTS_DIVISOR, GROUPS_MAX_TIME_TO_SHOW, -1, ENABLE_CURVE);
  			showChartIsLoading(c.div, c.name, c.chartOptions.width, c.chartOptions.height);
  			document.getElementById(c.id + '_group_actions_div').innerHTML = groupChartActions(i, c);
  			c.last_updated = 0;
  		}
  	});
  
  	updateUI();
  }
  
  window.onresize = function(event) {
  	resize_request = true;
  };
  
  
  // ------------------------------------------------------------------------
  // Core of the thread refreshing the charts
  
  var REFRESH_PAUSED = 0;
  var REFRESH_ALWAYS = 1;
  
  var refresh_mode = REFRESH_PAUSED;
  var last_refresh = 0;
  function playGraphs() {
  	mylog('playGraphs()');
  	if(refresh_mode == REFRESH_ALWAYS) return;
  
  	//mylog('PlayGraphs()');
  	refresh_mode = REFRESH_ALWAYS;
  	$('.mainchart_play_button').button('play');
  	$('.global_play_button').button('play');
  
  	// check if the thread died due to a javascript error
  	var now = new Date().getTime();
  	if((now - last_refresh) > 60000) {
  		// it died or never started
  		//mylog('It seems the refresh thread died. Restarting it.');
  		renderChartCallback();
  	}
  }
  
  function pauseGraphs() {
  	mylog('pauseGraphs()');
  	if(refresh_mode == REFRESH_PAUSED) return;
  
  	refresh_mode = REFRESH_PAUSED;
  	$('.mainchart_play_button').button('pause');
  	$('.global_play_button').button('pause');
  }
  
  var interval = null;
  function checkRefreshThread() {
  	if(interval == null) {
  		interval = setInterval(checkRefreshThread, 2000);
  		return;
  	}
  
  	var now = new Date().getTime();
  	if(now - last_refresh > 60000) {
  		mylog('Refresh thread died. Restarting it.');
  		renderChartCallback();
  	}
  }
  
  // refresh the proper chart
  // this is an internal function.
  // never call it directly, or new javascript threads will be spawn
  var timeout = null;
  function renderChartCallback() {
  	last_refresh = new Date().getTime();
  
  	if(!page_is_visible) {
  		timeout = setTimeout(triggerRefresh, CHARTS_CHECK_NO_FOCUS);
  		return;
  	}
  
  	if(resize_request) {
  		mylog('renderChartCallback() resize_request is set');
  		cleanupCharts();
  		resizeCharts();
  		resize_request = false;
  		// refresh_mode = REFRESH_ALWAYS;
  	}
  
  	if(last_user_scroll) {
  		var now = new Date().getTime();
  		if((now - last_user_scroll) >= CHARTS_SCROLL_IDLE) {
  			last_user_scroll = 0;
  			mylog('Scrolling: resuming refresh...');
  		}
  		else {
  			mylog('Scrolling: pausing refresh for ' + (CHARTS_SCROLL_IDLE - (now - last_user_scroll)) + ' ms...');
  			timeout = setTimeout(triggerRefresh, CHARTS_SCROLL_IDLE - (now - last_user_scroll));
  			return;
  		}
  	}
  
  	if(refresh_mode == REFRESH_PAUSED) {
  		if(mode == MODE_MAIN && mainchart.last_updated == 0) {
  			mainChartRefresh();
  			return;
  		}
  
  		if(mode != MODE_MAIN) {
  			timeout = setTimeout(triggerRefresh, CHARTS_REFRESH_IDLE);
  			return;
  		}
  	}
  
  	     if(mode == MODE_THUMBS)		timeout = setTimeout(thumbChartsRefreshNext, CHARTS_REFRESH_LOOP);
  	else if(mode == MODE_GROUP_THUMBS)  timeout = setTimeout(groupChartsRefreshNext, CHARTS_REFRESH_LOOP);
  	else if(mode == MODE_MAIN)   		timeout = setTimeout(mainChartRefresh, CHARTS_REFRESH_LOOP);
  	else                         		timeout = setTimeout(triggerRefresh, CHARTS_REFRESH_IDLE);
  }
  
  // callback for refreshing the charts later
  // this is an internal function.
  // never call it directly, or new javascript threads will be spawn
  function triggerRefresh() {
  	//mylog('triggerRefresh()');
  
  	if(!page_is_visible || (refresh_mode == REFRESH_PAUSED && mode != MODE_MAIN)) {
  		last_refresh = new Date().getTime();
  		timeout = setTimeout(triggerRefresh, CHARTS_REFRESH_IDLE);
  		return;
  	}
  
  	     if(mode == MODE_THUMBS) 		timeout = setTimeout(renderChartCallback, CHARTS_REFRESH_IDLE);
  	else if(mode == MODE_GROUP_THUMBS)	timeout = setTimeout(renderChartCallback, CHARTS_REFRESH_IDLE);
  	else if(mode == MODE_MAIN)   		timeout = setTimeout(renderChartCallback, CHARTS_REFRESH_IDLE);
  	else                         		timeout = setTimeout(triggerRefresh, CHARTS_REFRESH_IDLE);
  }
  
  // refresh the main chart
  // make sure we don't loose the refreshing thread
  function mainChartRefresh() {
  	//mylog('mainChartRefresh()');
  
  	if(mode != MODE_MAIN || !mainchart) {
  		triggerRefresh();
  		return;
  	}
  
  	if(refresh_mode == REFRESH_PAUSED && mainchart.last_updated != 0) {
  		hiddenChartRefresh();
  		return;
  	}
  
  	if(!renderChart(mainchart, hiddenChartRefresh))
  		hiddenChartRefresh();
  }
  
  function hiddenChartRefresh() {
  	refreshHiddenChart(triggerRefresh);
  }
  
  function roundRobinRenderChart(charts, startat) {
  	var refreshed = false;
  
  	// find a chart to refresh
  	var all = charts.length;
  	var cur = startat + 1;
  	var count = 0;
  
  	for(count = 0; count < all ; count++, cur++) {
  		if(cur >= all) cur = 0;
  
  		if(charts[cur].enabled) {
  			refreshed = renderChart(charts[cur], renderChartCallback);
  			if(refreshed) {
  				mylog('Refreshed: ' + charts[cur].name);
  				break;
  			}
  		}
  	}
  
  	if(!refreshed) triggerRefresh();
  	return cur;
  }
  
  // refresh the thumb charts
  // make sure we don't loose the refreshing thread
  var last_thumb_updated = 0;
  function thumbChartsRefreshNext() {
  	//mylog('thumbChartsRefreshNext()');
  
  	if(allCharts.length == 0 || mode != MODE_THUMBS) {
  		triggerRefresh();
  		return;
  	}
  
  	last_thumb_updated = roundRobinRenderChart(allCharts, last_thumb_updated);
  }
  
  // refresh the group charts
  // make sure we don't loose the refreshing thread
  var last_group_updated = 0;
  function groupChartsRefreshNext() {
  	//mylog('groupChartsRefreshNext()');
  
  	if(!groupCharts || groupCharts.length == 0 || mode != MODE_GROUP_THUMBS) {
  		//mylog('cannot refresh charts');
  		triggerRefresh();
  		return;
  	}
  
  	last_group_updated = roundRobinRenderChart(groupCharts, last_group_updated);
  }
  
  
  // ------------------------------------------------------------------------
  // switch the screen between views
  // these should be called only from initXXXX()
  
  function disableChart(i) {
  	mylog('disableChart(' + i + ')');
  
  	var chart = null;
  
  	var count = 0;
  	if(mode == MODE_GROUP_THUMBS && groupCharts) {
  		$.each(groupCharts, function(i, c) {
  			if(c.enabled) count++;
  		});
  
  		if(i < groupCharts.length) chart = groupCharts[i];
  	}
  	else if(mode == MODE_THUMBS) {
  		$.each(allCharts, function(i, c) {
  			if(c.enabled) count++;
  		});
  
  		if(i < allCharts.length) chart = allCharts[i];
  	}
  
  	if(!chart) return;
  
  	if(count <= 1) {
  		alert('Cannot close the last chart shown.');
  		return;
  	}
  
  	if(chart) {
  		mylog("request to disable chart " + chart.name);
  		chart.disablethisplease = true;
  		resize_request = true;
  	}
  	else
  		mylog("no chart to disable");
  }
  
  function cleanThisChart(chart, emptydivs) {
  	//mylog('cleanThisChart(' + chart.name + ', ' + emptydivs +')');
  
  	if(chart.dashboard) {
  		chart.dashboard.clear();
  		chart.dashboard = null;
  
  		if(chart.control_wrapper) {
  			chart.control_wrapper.clear();
  			chart.control_wrapper = null;
  		}
  
  		if(chart.hidden_wrapper) {
  			chart.hidden_wrapper.clear();
  			chart.hidden_wrapper = null;
  		}
  
  		chart.control_data = null;
  	}
  
  	if(chart.chart) chart.chart.clearChart();
  	chart.chart = null;
  
  	if(emptydivs) {
  		var div = document.getElementById(chart.div);
  		if(div) {
  			div.style.display = 'none';
  			div.innerHTML = "";
  		}
  
  		div = document.getElementById(chart.div + "_parent");
  		if(div) {
  			div.style.display = 'none';
  			div.innerHTML = "";
  		}
  	}
  
  	//mylog("chart " + chart.name + " cleaned with option " + emptydivs);
  }
  
  // cleanup the previously shown charts
  function cleanupCharts() {
  	// mylog('cleanupCharts()');
  
  	if(mode != MODE_MAIN && mainchart) {
  		if(mainchart.chart) cleanThisChart(mainchart);
  		mainchart = null;
  	}
  
  	if(mode != MODE_GROUP_THUMBS && groupCharts) {
  		clearGroupGraphs();
  	}
  
  	// cleanup the disabled charts
  	$.each(allCharts, function(i, c) {
  		if(c.disablethisplease && c.enabled) {
  			cleanThisChart(c, 'emptydivs');
  			c.disablethisplease = false;
  			c.enabled = false;
  			resize_request = true;
  			mylog("removed thumb chart " + c.name + " removed");
  		}
  	});
  
  	if(groupCharts) $.each(groupCharts, function(i, c) {
  		if(c.disablethisplease && c.enabled) {
  			cleanThisChart(c, 'emptydivs');
  			c.disablethisplease = false;
  			c.enabled = false;
  			resize_request = true;
  			mylog("removed group chart " + c.name + " removed");
  		}
  	});
  
  	// we never cleanup the main chart
  }
  
  function updateUI() {
  	$('[data-toggle="tooltip"]').tooltip({'container': 'body', 'html': true});
  
  	$('[data-spy="scroll"]').each(function () {
  		var $spy = $(this).scrollspy('refresh')
  	})
  }
  
  var thumbsScrollPosition = null;
  function switchToMainGraph() {
  	//mylog('switchToMainGraph()');
  
  	if(!mainchart) return;
  
  	if(!groupCharts) thumbsScrollPosition = window.pageYOffset;
  
  	document.getElementById('maingraph_container').style.display = 'block';
  	document.getElementById('thumbgraphs_container').style.display = 'none';
  	document.getElementById('groupgraphs_container').style.display = 'none';
  	document.getElementById('splash_container').style.display = 'none';
  
  	document.getElementById("main_menu_div").innerHTML = "<ul class=\"nav navbar-nav\"><li><a href=\"javascript:switchToThumbGraphs();\"><span class=\"glyphicon glyphicon-circle-arrow-left\"></span> Back to Dashboard</a></li><li class=\"active\"><a href=\"#\">" + mainchart.name + "</a></li>" + familiesmainmenu + chartsmainmenu + "</ul>" ;
  
  	window.scrollTo(0, 0);
  
  	mode = MODE_MAIN;
  	playGraphs();
  	updateUI();
  }
  
  function switchToThumbGraphs() {
  	//mylog('switchToThumbGraphs()');
  
  	document.getElementById('maingraph_container').style.display = 'none';
  	document.getElementById('thumbgraphs_container').style.display = 'block';
  	document.getElementById('groupgraphs_container').style.display = 'none';
  	document.getElementById('splash_container').style.display = 'none';
  
  	document.getElementById("main_menu_div").innerHTML = mainmenu;
  
  	if(thumbsScrollPosition) window.scrollTo(0, thumbsScrollPosition);
  
  	// switch mode
  	mode = MODE_THUMBS;
  	playGraphs();
  	updateUI();
  }
  
  function switchToGroupGraphs() {
  	//mylog('switchToGroupGraphs()');
  
  	if(!groupCharts) return;
  
  	if(!mainchart) thumbsScrollPosition = window.pageYOffset;
  
  	document.getElementById('maingraph_container').style.display = 'none';
  	document.getElementById('thumbgraphs_container').style.display = 'none';
  	document.getElementById('groupgraphs_container').style.display = 'block';
  	document.getElementById('splash_container').style.display = 'none';
  
  	document.getElementById("main_menu_div").innerHTML = "<ul class=\"nav navbar-nav\"><li><a href=\"javascript:switchToThumbGraphs();\"><span class=\"glyphicon glyphicon-circle-arrow-left\"></span> Back to Dashboard</a></li><li class=\"active\"><a href=\"#\">" + groupCharts[0].family + "</a></li>" + familiesmainmenu + chartsmainmenu + "</ul>";
  
  	window.scrollTo(0, 0);
  
  	mode = MODE_GROUP_THUMBS;
  	playGraphs();
  	updateUI();
  }
  
  
  // ------------------------------------------------------------------------
  // Group Charts
  
  var groupCharts = null;
  function initGroupGraphs(group) {
  	var count = 0;
  
  	if(groupCharts) clearGroupGraphs();
  	groupCharts = new Array();
  
  	var groupbody = "";
  	$.each(allCharts, function(i, c) {
  		if(c.family == group) {
  			groupCharts[count] = [];
  			groupCharts[count] = $.extend(true, {}, c);
  			groupCharts[count].div += "_group";
  			groupCharts[count].enabled = true;
  			groupCharts[count].chart = null;
  			groupCharts[count].last_updated = 0;
  			count++;
  		}
  	});
  	groupCharts.sort(chartssort);
  
  	var sizes = groupChartSizes();
  
  	var groupbody = "";
  	$.each(groupCharts, function(i, c) {
  		c.chartOptions.width = sizes.width;
  		c.chartOptions.height = sizes.height;
  		c.chartOptions.chartArea.width = '85%';
  		c.chartOptions.chartArea.height = '90%';
  		c.chartOptions.hAxis.textPosition = 'in';
  		c.chartOptions.hAxis.viewWindowMode = 'maximized';
  		c.chartOptions.hAxis.textStyle = { "fontSize": 9 };
  		c.chartOptions.vAxis.textStyle = { "fontSize": 9 };
  		c.chartOptions.fontSize = 11;
  		c.chartOptions.titlePosition = 'in';
  		c.chartOptions.tooltip = { "textStyle": { "fontSize": 9 } };
  		c.chartOptions.legend = { "textStyle": { "fontSize": 9 } };
  
  		calculateChartPointsToShow(c, c.chartOptions.isStacked?GROUPS_STACKED_POINTS_DIVISOR:GROUPS_POINTS_DIVISOR, GROUPS_MAX_TIME_TO_SHOW, -1, ENABLE_CURVE);
  
  		groupbody += "<div class=\"thumbgraph\" id=\"" + c.div + "_parent\"><table><tr><td width='" + sizes.width + "'><div class=\"thumbgraph\" id=\"" + c.div + "\">" + chartIsLoadingHTML(c.name, c.chartOptions.width, c.chartOptions.height) + "</div></td><td id=\"" + c.id + "_group_actions_div\" align=\"center\">" + groupChartActions(i, c) + "</td></tr><tr><td width='15'></td></tr></table></div>";
  		//groupbody += "<div class=\"thumbgraph\" id=\"" + c.div + "\">" + chartIsLoadingHTML(c.name, c.chartOptions.width, c.chartOptions.height) + "</div>";
  	});
  	groupbody += "";
  
  	document.getElementById("groupgraphs").innerHTML = groupbody;
  	switchToGroupGraphs();
  }
  
  function clearGroupGraphs() {
  	if(groupCharts && groupCharts.length) {
  		$.each(groupCharts, function(i, c) {
  			cleanThisChart(c, 'emptydivs');
  		});
  
  		groupCharts = null;
  	}
  
  	document.getElementById("groupgraphs").innerHTML = "";
  }
  
  
  // ------------------------------------------------------------------------
  // Global entry point
  // initialize the thumb charts
  
  var last_user_scroll = 0;
  
  // load the charts from the server
  // generate html for the thumbgraphs to support them
  function initCharts() {
  	setPresentationNormal(1);
  
  	var width = thumbWidth();
  	var height = TARGET_THUMB_GRAPH_HEIGHT;
  
  	window.onscroll = function (e) {
  		last_user_scroll = new Date().getTime();
  		mylog('Scrolling: detected');
  	}
  
  	loadCharts(null, function(all) {
  		allCharts = all.charts;
  
  		if(allCharts == null || allCharts.length == 0) {
  			alert("Cannot load data from server.");
  			return;
  		}
  
  		var thumbsContainer = document.getElementById("thumbgraphs");
  		if(!thumbsContainer) {
  			alert("Cannot find the thumbsContainer");
  			return;
  		}
  
  		allCharts.sort(chartssort);
  
  		document.getElementById('hostname_id').innerHTML = all.hostname;
  		document.title = all.hostname;
  
  		// create an array for grouping all same-type graphs together
  		var dimensions = 0;
  		var categories = new Array();
  		var families = new Array();
  		var chartslist = new Array();
  		$.each(allCharts, function(i, c) {
  			var j;
  
  			chartslist.push({name: c.name, type: c.type, id: i});
  
  			dimensions += c.dimensions.length;
  			c.chartOptions.width = width;
  			c.chartOptions.height = height;
  
  			// calculate how many point to show for each chart
  			//c.points_to_show = Math.round(c.entries / c.group) - 1;
  			// show max 10 mins of data
  			//if(c.points_to_show * c.group > THUMBS_MAX_TIME_TO_SHOW) c.points_to_show = THUMBS_MAX_TIME_TO_SHOW / c.group;
  			calculateChartPointsToShow(c, c.chartOptions.isStacked?THUMBS_STACKED_POINTS_DIVISOR:THUMBS_POINTS_DIVISOR, THUMBS_MAX_TIME_TO_SHOW, -1, ENABLE_CURVE);
  
  			if(c.enabled) {
  				var h = "<div class=\"thumbgraph\" id=\"" + c.div + "_parent\"><table><tr><td><div class=\"thumbgraph\" id=\"" + c.div + "\">" + chartIsLoadingHTML(c.name, c.chartOptions.width, c.chartOptions.height) + "</div></td></tr><tr><td id=\"" + c.id + "_thumb_actions_div\" align=\"center\">"
  				+ thumbChartActions(i, c)
  				+	"</td></tr><tr><td height='15'></td></tr></table></div>";
  
  				// find the categories object for this type
  				for(j = 0; j < categories.length ;j++) {
  					if(categories[j].name == c.type) {
  						categories[j].html += h;
  						categories[j].count++;
  						break;
  					}
  				}
  
  				if(j == categories.length)
  					categories.push({name: c.type, title: c.category, description: '', priority: c.categoryPriority, count: 1, glyphicon: c.glyphicon, html: h});
  			}
  
  			// find the families object for this type
  			for(j = 0; j < families.length ;j++) {
  				if(families[j].name == c.family) {
  					families[j].count++;
  					break;
  				}
  			}
  
  			if(j == families.length)
  				families.push({name: c.family, count: 1});
  		});
  
  		document.getElementById('server_summary_id').innerHTML = "<small>NetData server at <b>" + all.hostname + "</b> is maintaining <b>" + allCharts.length + "</b> charts, having <b>" + dimensions + "</b> dimensions (by default with <b>" + all.history + "</b> entries each), which are updated every <b>" + all.update_every + "s</b>, using a total of <b>" + (Math.round(all.memory * 10 / 1024 / 1024) / 10) + " MB</b> for the round robin database.</small>";
  
  		$.each(categories, function(i, a) {
  			a.html = "<tr><td id=\"" + a.name + "\"><ol class=\"breadcrumb graphs\"><li class=\"active\"><span class=\"glyphicon " + a.glyphicon + "\"></span> &nbsp; <a id=\"" + a.name + "\" href=\"#" + a.name + "\"><b>" + a.title + "</b> " + a.description + " </a></li></ol></td></tr><tr><td><div class=\"thumbgraphs\">" + a.html + "</td></tr>";
  		});
  
  		function categoriessort(a, b) {
  			if(a.priority < b.priority) return -1;
  			return 1;
  		}
  		categories.sort(categoriessort);
  
  		function familiessort(a, b) {
  			if(a.name < b.name) return -1;
  			return 1;
  		}
  		families.sort(familiessort);
  
  		function chartslistsort(a, b) {
  			if(a.name < b.name) return -1;
  			return 1;
  		}
  		chartslist.sort(chartslistsort);
  
  		// combine all the htmls into one
  		var allcategories = "<table width=\"100%\">";
  		mainmenu = '<ul class="nav navbar-nav">';
  
  		categoriesmainmenu = '<li class="dropdown"><a href="#" class="dropdown-toggle" data-toggle="dropdown"><span class=\"glyphicon glyphicon-fire\"></span> Dashboard Sections <b class="caret"></b></a><ul class="dropdown-menu">';
  		$.each(categories, function(i, a) {
  			allcategories += a.html;
  			categoriesmainmenu += "<li><a href=\"#" + a.name + "\">" + a.title + "</a></li>";
  		});
  		categoriesmainmenu += "</ul></li>";
  		allcategories += "</table>";
  
  		familiesmainmenu = '<li class="dropdown"><a href="#" class="dropdown-toggle" data-toggle="dropdown"><span class=\"glyphicon glyphicon-th-large\"></span> Chart Families <b class="caret"></b></a><ul class="dropdown-menu">';
  		$.each(families, function(i, a) {
  			familiesmainmenu += "<li><a href=\"javascript:initGroupGraphs('" + a.name + "');\">" + a.name + " <span class=\"badge pull-right\">" + a.count + "</span></a></li>";
  		});
  		familiesmainmenu += "</ul></li>";
  
  		chartsmainmenu = '<li class="dropdown"><a href="#" class="dropdown-toggle" data-toggle="dropdown"><span class=\"glyphicon glyphicon-resize-full\"></span> All Charts <b class="caret"></b></a><ul class="dropdown-menu">';
  		$.each(chartslist, function(i, a) {
  			chartsmainmenu += "<li><a href=\"javascript:initMainChartIndexOfMyCharts('" + a.id + "');\">" + a.name + "</a></li>";
  		});
  		chartsmainmenu += "</ul></li>";
  
  		mainmenu += categoriesmainmenu;
  		mainmenu += familiesmainmenu;
  		mainmenu += chartsmainmenu;
  		mainmenu += '<li role="presentation" class="disabled" style="display: none;"><a href="#" id="logline"></a></li></ul>';
  
  		thumbsContainer.innerHTML = allcategories;
  		switchToThumbGraphs();
  		checkRefreshThread();
  	});
  }
  
  $(window).blur(function() {
  	page_is_visible = 0;
  	mylog('Lost Focus!');
  });
  
  $(window).focus(function() {
  	page_is_visible = 1;
  	mylog('Focus restored!');
  });
  
  // Set a callback to run when the Google Visualization API is loaded.
  google.setOnLoadCallback(initCharts);
  