/*global d3,dpl,pyfy*/
var options = {
  drift : 0,
  vol : 20,
  randomize : function() {
   delete q.cache[b.ID];
   chart.render();
   b.args.random.arg("bump",0);
   chart.render(500);
  }
};

var zoom = d3.behavior.zoom(),
    q = pyfy.query(),
    
    a=pyfy.flow(APPL),
    b=a.lognorm(0.2,0.0);

var chart = dpl.chart(d3.select("svg"))
      .setTitle("chart","APPL - Brownian Bridge Experiment")
      .scale("x",d3.time.scale());

var path = chart.graph
  .append("path")
  .classed("brownian",true);

var circle = chart.graph
  .selectAll("circle")
  .data(q.val(a))
    .enter()
    .append("circle")
    .attr("r",5)
    .classed("points",true)
    .call(dpl.fitScale("x"));


chart.on("resize.autofit",resize);

function resize() {
  var domain = chart.scale("x").domain(),
      first = new Date(domain[0].getFullYear()-1,1,1);
      var points = [];
      points = d3.range(first,domain[1],pyfy.util.DAYMS *100 / Math.round(zoom.scale()))
        .filter(function(d) { return d > domain[0] && d < domain[1]; });

  q.get(b,points);

  var data = q.val(b)
    .filter(function(d) {
      return d.x > domain[0] && d.x < domain[1];
    });

  path.datum(data)
    .call(dpl.fitScale("y",function(d) {
      return [d[0]*0.95,d[1]*1.05];
    }));
}

chart.render();

zoom.x(chart.scale("x"))
  .y(chart.scale("y"))
  .on("zoom", chart.render);

chart.g.call(zoom);


var gui = new dat.GUI()
gui.add(options, 'vol', 0, 100,0.5).onChange(changeArg("vol"));
gui.add(options,'drift',0,20,0.5).onChange(changeArg("drift"));
gui.add(options, 'randomize', 0, 100);

function changeArg(name) {
  return function() {
    b.arg(name,options[name]/100);
    if (q.cache[b.args.random.ID]) {
      q.val(b,Object.keys(q.cache[b.args.random.ID].values).map(function(d) { return +d; }));
    }
    chart.render();
  };
}