function data_convert(registry_raw){
    var controller_map={};
    var controllers=[];
    for (var r in registry_raw){
        var controller={};
        if ( !(registry_raw[r][0]['controllerId'] in controller_map) ){
	    controller.name=registry_raw[r][0]['controllerId'];
	    controller.onos=1;
	    controllers.push(controller);
	    controller_map[registry_raw[r][0]['controllerId']] = 1;
         }
    }
//    controllers.sort(
//      function(a,b){
//        if(a.name < b.name)
//          return -1;
//        if(a.name > b.name)
//          return 1;
//        return 0;
//      }
//     );
     return controllers;
}

function controller_status(registry_url){
/*    var data = [{name:'onos9vpc',  onos: 1, cassandra: 1},
		{name:'onos10vpc', onos: 0, cassandra: 1},
		{name:'onos11vpc', onos: 1, cassandra: 1},
		{name:'onos12vpc', onos: 0, cassandra: 1}] */

    var barWidth = 100;
    var width = (barWidth + 10) * 8
    var height = 50;

    var ContStatus = d3.select("#onos-status").
	append("svg:svg").
	attr("width", 1280).
	attr("height", 50);

    setInterval(function() {
        $.ajax({
	    url: registry_url,
	    success: function(registry) {
		draw(data_convert(registry));
	    },
	    error: function() {
		return;
	    },
	    dataType: "json"
        });
    }, 3000); 
    function draw(json){
	var data = json;
	var controller_rect = ContStatus.selectAll("rect").data(data);
	var controller_text = ContStatus.selectAll("text").data(data);

	var x = d3.scale.linear().domain([0, data.length]).range([0, width]);
	var y = d3.scale.linear().domain([0, d3.max(data, function(datum) { return datum.onos; })]).rangeRound([0, height]);

	console.log(data)
	controller_rect.
	    enter().
	    append("svg:rect").
	    attr("x", function(datum, index) { return x(index); }).
	    attr("y", function(datum) { return height - y(datum.onos); }).
	    attr("height", function(datum) { return y(datum.onos); }).
	    attr("width", barWidth).
	    attr("fill", function(datum, index) { 
		if (index == 0){
		    return "red"
		}else if (index == 1){
		    return "blue"
		}else if (index == 2){
		    return "green"
		}else if (index == 3){
		    return "orange"
		}else if (index == 4){
		    return "cyan"
		}else if (index == 5){
		    return "magenta"
		}else if (index == 6){
		    return "yellow"
		}else if (index == 7){
		    return "purple"
		}else{
		    return "black"
		}
	    });

	controller_text.
	    enter().
	    append("svg:text").
	    text(function(datum) { return datum.name; }).
	    attr("x", function(datum, index) { return x(index)+10; }).
	    attr("y", function(datum) { return 30 ; }).
	    attr("height", function(datum) { return y(datum.onos); }).
	    attr("width", barWidth).
	    attr('fill', 'white'); 


	controller_rect.
	    attr("x", function(datum, index) { return x(index); }).
	    attr("y", function(datum) { return height - y(datum.onos); }).
	    attr("height", function(datum) { return y(datum.onos); }).
	    attr("width", barWidth).
	    attr("fill", function(datum, index) { 
		if (index == 0){
		    return "red"
		}else if (index == 1){
		    return "blue"
		}else if (index == 2){
		    return "green"
		}else if (index == 3){
		    return "orange"
		}else if (index == 4){
		    return "cyan"
		}else if (index == 5){
		    return "magenta"
		}else if (index == 6){
		    return "yellow"
		}else if (index == 7){
		    return "purple"
		}else{
		    return "black"
		}
	    });

	controller_text.
	    text(function(datum) { return datum.name; }).
	    attr("x", function(datum, index) { return x(index)+10; }).
	    attr("y", function(datum) { return 30 ; }).
	    attr("height", function(datum) { return y(datum.onos); }).
	    attr("width", barWidth).
	    attr('fill', 'white'); 

	controller_rect.exit().remove();
	controller_text.exit().remove();
    }
/*
    $("#more").click( function() {
        $.ajax({
	    url: 'http://gui.onlab.us:8080/controller_status1',
	    success: function(json) {
		draw(json);
	    },
	    dataType: "json"
        });
    });
    $("#less").click( function() {
        $.ajax({
	    url: 'http://gui.onlab.us:8080/controller_status2',
	    success: function(json) {
		draw(json);
	    },
	    dataType: "json"
        });
    });
*/
}