(function() {
  var categories, classes, colorify, data_url, geo_url, height, path_generator, projection, radius, svg, width, zoom, zoom_group;

  width = 960;

  height = 500;

  radius = 2;

  svg = d3.select('svg');

  zoom_group = svg.append('g');

  zoom = d3.behavior.zoom().scaleExtent([1, 4]).on('zoom', function() {
    zoom_group.attr('transform', "translate(" + (zoom.translate()) + ")scale(" + (zoom.scale()) + ")");
    return zoom_group.selectAll('.place').attr('r', radius / zoom.scale());
  });

  svg.call(zoom);

  projection = d3.geo.azimuthalEqualArea().clipAngle(180 - 1e-3).scale(160000).rotate([-10.277475, -42.789034, 0]).translate([width / 2, height / 2]).precision(0.1);

  path_generator = d3.geo.path().projection(projection);

  categories = ['restaurant', 'attraction', 'poi', 'accommodation'];

  classes = categories.length;

  colorify = d3.scale.category10().domain(categories);

  data_url = 'http://wafi.iit.cnr.it/webvis/tmp/elba_places.json';

  geo_url = 'http://wafi.iit.cnr.it/webvis/italiastat/data/istat/2011/reg2011.topo.json';

  d3.json(geo_url, function(geo) {
    var regions;

    regions = topojson.feature(geo, geo.objects.reg2011);
    zoom_group.selectAll('.region').data(regions.features).enter().append('path').attr('class', 'region').attr('d', path_generator);
    return d3.json(data_url, function(points) {
      var angle, apothem, arc_generator, bins, hexbin, max, max_tot, pie_layout, pies, radius_scale, subplots;

      radius = 16;
      apothem = Math.sqrt(3) / 2 * radius;
      hexbin = d3.hexbin().size([width, height]).radius(radius).x(function(d) {
        return projection([d.lng, d.lat])[0];
      }).y(function(d) {
        return projection([d.lng, d.lat])[1];
      });
      bins = _.chain(hexbin(points)).forEach(function(bin) {
        return bin.classes_count = _.chain(categories).map(function(klass) {
          var count;

          count = bin.filter(function(point) {
            return point.category === klass;
          }).length;
          return {
            count: count,
            "class": klass
          };
        }).value();
      }).value();
      max_tot = d3.max(bins, function(bin) {
        return bin.length;
      });
      max = d3.max(bins, function(bin) {
        return d3.max(bin.classes_count, function(count) {
          return count.count;
        });
      });
      angle = 2 * Math.PI / classes;
      subplots = zoom_group.selectAll('.subplot').data(bins);
      subplots.enter().append('g').attr({
        "class": 'subplot',
        transform: function(bin) {
          return "translate(" + bin.x + "," + bin.y + ")";
        }
      });
      pie_layout = d3.layout.pie().sort(null).value(function(count) {
        return count.count;
      });
      radius_scale = d3.scale.sqrt().domain([0, max_tot]).range([0, apothem]);
      arc_generator = d3.svg.arc().outerRadius(function(count) {
        return radius_scale(d3.select(this.parentNode).datum().length);
      }).innerRadius(0);
      pies = subplots.selectAll('.pie').data(function(bin) {
        return pie_layout(bin.classes_count);
      });
      return pies.enter().append('path').attr({
        "class": 'pie',
        d: arc_generator,
        fill: function(count) {
          return colorify(count.data["class"]);
        }
      });
    });
  });

}).call(this);