
nv.models.scatterChart = function() {
  var margin = {top: 30, right: 20, bottom: 50, left: 60},
      width = null,
      height = null,
      color = d3.scale.category20().range(),
      showDistX = false,
      showDistY = false,
      showLegend = true,
      tooltips = true,
      tooltipX = function(key, x, y) { return '<strong>' + x + '</strong>' },
      tooltipY = function(key, x, y) { return '<strong>' + y + '</strong>' },
      tooltip = function(key, x, y, e, graph) { 
        return '<h3>' + key + '</h3>' +
               '<p>' +  y + ' at ' + x + '</p>'
      };


  var scatter = nv.models.scatter(),
      x = scatter.xScale(),
      y = scatter.yScale(),
      xAxis = nv.models.axis().orient('bottom').scale(x).tickPadding(10),
      yAxis = nv.models.axis().orient('left').scale(y).tickPadding(10),
      legend = nv.models.legend().height(30),
      distX = nv.models.distribution().axis('x').scale(x),
      distY = nv.models.distribution().axis('y').scale(y),
      dispatch = d3.dispatch('tooltipShow', 'tooltipHide'),
      x0, y0; //TODO: abstract distribution component and have old scales stored there

  var showTooltip = function(e, offsetElement) {
    //TODO: make tooltip style an option between single or dual on axes (maybe on all charts with axes?)

    //var left = e.pos[0] + ( offsetElement.offsetLeft || 0 ),
        //top = e.pos[1] + ( offsetElement.offsetTop || 0),
    var leftX = e.pos[0] + ( offsetElement.offsetLeft || 0 ),
        topX = y.range()[0] + margin.top + ( offsetElement.offsetTop || 0),
        leftY = x.range()[0] + margin.left + ( offsetElement.offsetLeft || 0 ),
        topY = e.pos[1] + ( offsetElement.offsetTop || 0),
        xVal = xAxis.tickFormat()(scatter.x()(e.point)),
        yVal = yAxis.tickFormat()(scatter.y()(e.point)),
        contentX = tooltipX(e.series.key, xVal, yVal, e, chart),
        contentY = tooltipY(e.series.key, xVal, yVal, e, chart);
        //content = tooltip(e.series.key, xVal, yVal, e, chart);

    nv.tooltip.show([leftX, topX], contentX, 'n', 1);
    nv.tooltip.show([leftY, topY], contentY, 'e', 1);
    //nv.tooltip.show([left, top], content, e.value < 0 ? 'n' : 's');
  };


  function chart(selection) {
    selection.each(function(data) {
      var container = d3.select(this),
          that = this;

      //TODO: decide if this makes sense to add into all the models for ease of updating (updating without needing the selection)
      chart.update = function() { container.transition().call(chart) };


      var availableWidth = (width  || parseInt(container.style('width')) || 960)
                             - margin.left - margin.right,
          availableHeight = (height || parseInt(container.style('height')) || 400)
                             - margin.top - margin.bottom;



      x0 = x0 || scatter.xScale();
      y0 = y0 || scatter.yScale();



      var wrap = container.selectAll('g.wrap.scatterChart').data([data]);
      var gEnter = wrap.enter().append('g').attr('class', 'wrap nvd3 scatterChart chart-' + scatter.id()).append('g');

      gEnter.append('g').attr('class', 'legendWrap');
      gEnter.append('g').attr('class', 'x axis');
      gEnter.append('g').attr('class', 'y axis');
      gEnter.append('g').attr('class', 'scatterWrap');
      gEnter.append('g').attr('class', 'distWrap');

      var g = wrap.select('g')

      if (showLegend) {
        legend.width( availableWidth / 2 );

        wrap.select('.legendWrap')
            .datum(data)
            .call(legend);

        if ( margin.top != legend.height()) {
          margin.top = legend.height();
          availableHeight = (height || parseInt(container.style('height')) || 400)
                             - margin.top - margin.bottom;
        }

        wrap.select('.legendWrap')
            .attr('transform', 'translate(' + (availableWidth / 2) + ',' + (-margin.top) +')');
      }


      scatter
        .width(availableWidth)
        .height(availableHeight)
        .color(data.map(function(d,i) {
          return d.color || color[i % color.length];
        }).filter(function(d,i) { return !data[i].disabled }))


      g.attr('transform', 'translate(' + margin.left + ',' + margin.top + ')');


      var scatterWrap = wrap.select('.scatterWrap')
          .datum(data.filter(function(d) { return !d.disabled }));
      d3.transition(scatterWrap).call(scatter);


      xAxis
        .ticks( availableWidth / 100 )
        .tickSize( -availableHeight , 0);

      g.select('.x.axis')
          .attr('transform', 'translate(0,' + y.range()[0] + ')');
      d3.transition(g.select('.x.axis'))
          .call(xAxis);


      yAxis
        .ticks( availableHeight / 36 )
        .tickSize( -availableWidth, 0);

      d3.transition(g.select('.y.axis'))
          .call(yAxis);


      distX
        .width(availableWidth)
        .color(data.map(function(d,i) {
          return d.color || color[i % color.length];
        }).filter(function(d,i) { return !data[i].disabled }));
      gEnter.select('.distWrap').append('g')
          .attr('class', 'distributionX')
          .attr('transform', 'translate(0,' + y.range()[0] + ')');
      g.select('.distributionX')
          .datum(data.filter(function(d) { return !d.disabled }))
          .call(distX);


      distY
        .width(availableHeight)
        .color(data.map(function(d,i) {
          return d.color || color[i % color.length];
        }).filter(function(d,i) { return !data[i].disabled }));
      gEnter.select('.distWrap').append('g')
          .attr('class', 'distributionY')
          .attr('transform', 'translate(-' + distY.size() + ',0)');
      g.select('.distributionY')
          .datum(data.filter(function(d) { return !d.disabled }))
          .call(distY);



      legend.dispatch.on('legendClick', function(d,i, that) {
        d.disabled = !d.disabled;

        if (!data.filter(function(d) { return !d.disabled }).length) {
          data.map(function(d) {
            d.disabled = false;
            wrap.selectAll('.series').classed('disabled', false);
            return d;
          });
        }
        
        chart.update();
      });

      /*
      legend.dispatch.on('legendMouseover', function(d, i) {
        d.hover = true;
        selection.transition().call(chart)
      });

      legend.dispatch.on('legendMouseout', function(d, i) {
        d.hover = false;
        selection.transition().call(chart)
      });
      */


      scatter.dispatch.on('elementMouseover.tooltip', function(e) {
        d3.select('.chart-' + scatter.id() + ' .series-' + e.seriesIndex + ' .distx-' + e.pointIndex)
            .attr('y1', e.pos[1] - availableHeight);
        d3.select('.chart-' + scatter.id() + ' .series-' + e.seriesIndex + ' .disty-' + e.pointIndex)
            .attr('x2', e.pos[0] + distX.size());

        e.pos = [e.pos[0] + margin.left, e.pos[1] + margin.top];
        dispatch.tooltipShow(e);
      });
      if (tooltips) dispatch.on('tooltipShow', function(e) { showTooltip(e, that.parentNode) } ); // TODO: maybe merge with above?

      scatter.dispatch.on('elementMouseout.tooltip', function(e) {
        dispatch.tooltipHide(e);

        d3.select('.chart-' + scatter.id() + ' .series-' + e.seriesIndex + ' .distx-' + e.pointIndex)
            .attr('y1', 0);
        d3.select('.chart-' + scatter.id() + ' .series-' + e.seriesIndex + ' .disty-' + e.pointIndex)
            .attr('x2', distY.size());
      });
      if (tooltips) dispatch.on('tooltipHide', nv.tooltip.cleanup);


      //store old scales for use in transitions on update, to animate from old to new positions, and sizes
      x0 = x.copy();
      y0 = y.copy();

    });

    return chart;
  }


  chart.dispatch = dispatch;
  chart.legend = legend;
  chart.xAxis = xAxis;
  chart.yAxis = yAxis;

  d3.rebind(chart, scatter, 'interactive', 'shape', 'size', 'xScale', 'yScale', 'zScale', 'xDomain', 'yDomain', 'sizeDomain', 'forceX', 'forceY', 'forceSize', 'clipVoronoi', 'clipRadius', 'fisheye', 'fisheyeRadius');


  chart.margin = function(_) {
    if (!arguments.length) return margin;
    margin = _;
    return chart;
  };

  chart.width = function(_) {
    if (!arguments.length) return width;
    width = _;
    return chart;
  };

  chart.height = function(_) {
    if (!arguments.length) return height;
    height = _;
    return chart;
  };

  chart.color = function(_) {
    if (!arguments.length) return color;
    color = _;
    legend.color(_);
    distX.color(_);
    distY.color(_);
    return chart;
  };

  chart.showDistX = function(_) {
    if (!arguments.length) return showDistX;
    showDistX = _;
    return chart;
  };

  chart.showDistY = function(_) {
    if (!arguments.length) return showDistY;
    showDistY = _;
    return chart;
  };

  chart.showControls = function(_) {
    if (!arguments.length) return showControls;
    showControls = _;
    return chart;
  };

  chart.showLegend = function(_) {
    if (!arguments.length) return showLegend;
    showLegend = _;
    return chart;
  };

  chart.tooltips = function(_) {
    if (!arguments.length) return tooltips;
    tooltips = _;
    return chart;
  };

  chart.tooltipContent = function(_) {
    if (!arguments.length) return tooltip;
    tooltip = _;
    return chart;
  };


  return chart;
}
