px.registerWidget('big_number', function(data_attribute) {

  var token_name = data_attribute['token'];
  var json_callback = data_attribute['json_endpoint'];
  var div = d3.select('#' + token_name);

  function render() {
    d3.json(json_callback, function(error, payload){
      json = payload.data;
      div.html("");
      //Define the percentage bounds that define color from red to green
      if (error != null){
        var err = '<div class="alert alert-danger">' + error.responseText  + '</div>';
        div.html(err);
        return '';
      }
      var color_range = [-1, 1];
      var compare_pos = -23
      var target_url = 'd3js.org';

      var f = d3.format('.3s');
      var fp = d3.format('+.1%');
      var xy = div.node().getBoundingClientRect();
      var width = xy.width;
      var height = xy.height - 30;
      var svg = div.append('svg');
      svg.attr("width", width);
      svg.attr("height", height);
      data = json.data;
      var compare_suffix = ' ' + json.compare_suffix;
      var v_compare = null;
      var v = data[data.length - 1][1];
      if (json.compare_lag > 0){
        pos = data.length - (json.compare_lag + 1);
        if (pos >= 0){
          v_compare = (v / data[pos][1]) - 1;
        }
      }
      var date_ext = d3.extent(data, function(d) { return d[0]; });
      var value_ext = d3.extent(data, function(d) { return d[1]; });

      var margin = 20;
      var scale_x = d3.time.scale.utc().domain(date_ext).range([margin, width - margin]);
      var scale_y = d3.scale.linear().domain(value_ext).range([height - (margin), margin]);
      var colorRange = [d3.hsl(0, 1, 0.3), d3.hsl(120, 1, 0.3)];
      var scale_color = d3.scale
          .linear().domain(color_range)
          .interpolate(d3.interpolateHsl)
          .range(colorRange).clamp(true);
      var line = d3.svg.line()
          .x(function(d) { return scale_x(d[0]); })
          .y(function(d) { return scale_y(d[1]); })
          .interpolate("basis");

      //Drawing trend line
      var g = svg.append('g');
      var path = g.append('path')
          .attr('d', function(d) { return line(data); })
          .attr('stroke-width', 5)
          .attr('opacity', 0.5)
          .attr('fill', "none")
          .attr('stroke-linecap',"round")
          .attr('stroke', "grey");

      var g = svg.append('g')
         .attr('class', 'digits')
         .attr('opacity', 1);

      var y = height / 2;
      if (v_compare != null) {
        y = (height / 8) * 3;
      }

      //Printing big number
      g.append('text')
        .attr('x', width / 2)
        .attr('y', y)
        .attr('class', 'big')
        .attr('alignment-baseline', 'middle')
        .attr('id', 'bigNumber')
        .style('font-weight', 'bold')
        .style('cursor', 'pointer')
        .text(f(v))
        .style('font-size', d3.min([height, width]) / 3.5)
        .attr('fill','white');

      var c = scale_color(v_compare);

      //Printing compare %
      if (v_compare != null) {
        g.append('text')
          .attr('x', width / 2)
          .attr('y', (height / 16) *12)
          .text(fp(v_compare) + compare_suffix)
          .style('font-size', d3.min([height, width]) / 8)
          .style('text-anchor', 'middle')
          .attr('fill', c)
          .attr('stroke', c);
      }

      var g_axis = svg.append('g').attr('class', 'axis').attr('opacity', 0);
      var g = g_axis.append('g');
      var x_axis = d3.svg.axis()
        .scale(scale_x)
        .orient('bottom')
        .ticks(4);
      g.call(x_axis);
      g.attr('transform', 'translate(0,' + (height - margin) + ')');

      var g = g_axis.append('g').attr('transform', 'translate(' + (width - margin) + ',0)');
      var y_axis = d3.svg.axis()
        .scale(scale_y)
        .orient('left')
        .tickFormat(d3.format('.3s'))
        .tickValues(value_ext);
      g.call(y_axis);
      g.selectAll('text')
        .style('text-anchor', 'end')
        .attr('y','-5')
        .attr('x','1');

      g.selectAll("text")
        .style('font-size', '10px');

      div.on('mouseover', function(d) {
        var div = d3.select(this);
        div.select('path').transition().duration(500).attr('opacity', 1)
          .style('stroke-width', '2px');
        div.select('g.digits').transition().duration(500).attr('opacity', 0.1);
        div.select('g.axis').transition().duration(500).attr('opacity', 1);
      })
      .on('mouseout', function(d) {
        var div = d3.select(this);
        div.select('path').transition().duration(500).attr('opacity', 0.5)
          .style('stroke-width', '5px');
        div.select('g.digits').transition().duration(500).attr('opacity', 1);
        div.select('g.axis').transition().duration(500).attr('opacity', 0);
      });
    });
  };

  return {
    render: render,
    resize: render,
  }

});