%%javascript 

require.config({
  paths: {
      d3: '//cdnjs.cloudflare.com/ajax/libs/d3/3.4.8/d3.min'
  }
});

from IPython.core.display import HTML
HTML("""
<style>
.node {
cursor: pointer;
}

.node circle {
  fill: #fff;
  stroke: steelblue;
  stroke-width: 3px;
}

.node text {
  font: 12px sans-serif;
}

.link {
  fill: none;
  stroke: #ccc;
  stroke-width: 2px;
}
</style>
""")

def visulizedata(pipeline):
   
    data=list()
    previous='null'

    current = dict()
    for name, transform in pipeline.steps:
        if transform is not None:
            current['name']=name
            current['parent']=previous
            current['children']=visulizedata(pipeline)
            

showdata = [
  {
    "name": "Impute",
    "parent": "null",
    "children": [
      {
        "name": "gradient boosting tree",
        "parent": "Impute",
      }
    ]
  }
]

from IPython.display import Javascript
Javascript("""
           window.headwayVsRidership={};
           """.format(showdata))

%%javascript
require(['d3'], function(d3){
        
element.append("<div id='chart2'></div>");
    
var treeData =  window.headwayVsRidership;


// ************** Generate the tree diagram	 *****************
var margin = {top: 20, right: 120, bottom: 20, left: 120},
width = 960 - margin.right - margin.left,
height = 500 - margin.top - margin.bottom;

var i = 0,
duration = 750,
root;

var tree = d3.layout.tree().size([height, width]);

var diagonal = d3.svg.diagonal().projection(function(d) { return [d.y, d.x]; });

var svg = d3.select("#chart2").append("svg")
.attr("width", width + margin.right + margin.left)
.attr("height", height + margin.top + margin.bottom)
  .append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");

root = treeData[0];
root.x0 = height / 2;
root.y0 = 0;
  
update(root);

d3.select(self.frameElement).style("height", "500px");

function update(source) {

  // Compute the new tree layout.
  var nodes = tree.nodes(root).reverse(),
  links = tree.links(nodes);

  // Normalize for fixed-depth.
  nodes.forEach(function(d) { d.y = d.depth * 180; });

  // Update the nodes…
  var node = svg.selectAll("g.node")
 .data(nodes, function(d) { return d.id || (d.id = ++i); });

  // Enter any new nodes at the parent's previous position.
  var nodeEnter = node.enter().append("g")
.attr("class", "node")
 .attr("transform", function(d) { return "translate(" + source.y0 + "," + source.x0 + ")"; })
 .on("click", click);

  nodeEnter.append("circle")
 .attr("r", 1e-6)
  .style("fill", function(d) { return d._children ? "lightsteelblue" : "#fff"; });

  nodeEnter.append("text")
 .attr("x", function(d) { return d.children || d._children ? -13 : 13; })
 .attr("dy", ".35em")
.attr("text-anchor", function(d) { return d.children || d._children ? "end" : "start"; })
 .text(function(d) { return d.name; })
 .style("fill-opacity", 1e-6);

  // Transition nodes to their new position.
  var nodeUpdate = node.transition()
 .duration(duration)
 .attr("transform", function(d) { return "translate(" + d.y + "," + d.x + ")"; });

  nodeUpdate.select("circle")
  .attr("r", 10)
  .style("fill", function(d) { return d._children ? "lightsteelblue" : "#fff"; });

  nodeUpdate.select("text")
  .style("fill-opacity", 1);

  // Transition exiting nodes to the parent's new position.
  var nodeExit = node.exit().transition()
 .duration(duration)
 .attr("transform", function(d) { return "translate(" + source.y + "," + source.x + ")"; })
  .remove();

  nodeExit.select("circle")
  .attr("r", 1e-6);

  nodeExit.select("text")
  .style("fill-opacity", 1e-6);

  // Update the links…
  var link = svg.selectAll("path.link")
  .data(links, function(d) { return d.target.id; });

  // Enter any new links at the parent's previous position.
  link.enter().insert("path", "g")
  .attr("class", "link")
  .attr("d", function(d) {
        var o = {x: source.x0, y: source.y0};
        return diagonal({source: o, target: o});
  });

  // Transition links to their new position.
  link.transition()
 .duration(duration)
  .attr("d", diagonal);

  // Transition exiting nodes to the parent's new position.
  link.exit().transition()
  .duration(duration)
  .attr("d", function(d) {
        var o = {x: source.x, y: source.y};
        return diagonal({source: o, target: o});
  })
  .remove();

  // Stash the old positions for transition.
  nodes.forEach(function(d) {
        d.x0 = d.x;
        d.y0 = d.y;
  });
}

// Toggle children on click.
function click(d) {
  if (d.children) {
d._children = d.children;
d.children = null;
  } else {
d.children = d._children;
d._children = null;
  }
  update(d);
}
    

});