nv.models.historicalBarChart = function() {
  "use strict";
  //============================================================
  // Public Variables with Default Settings
  //------------------------------------------------------------

  var bars = nv.models.historicalBar()
    , xAxis = nv.models.axis()
    , yAxis = nv.models.axis()
    , legend = nv.models.legend()
    ;


  var margin = {top: 30, right: 90, bottom: 50, left: 90}
    , color = nv.utils.defaultColor()
    , width = null
    , height = null
    , showLegend = false
    , showXAxis = true
    , showYAxis = true
    , rightAlignYAxis = false
    , tooltips = true
    , tooltip = function(key, x, y, e, graph) {
        return '<h3>' + key + '</h3>' +
               '<p>' +  y + ' at ' + x + '</p>'
      }
    , x
    , y
    , state = {}
    , defaultState = null
    , noData = 'No Data Available.'
    , dispatch = d3.dispatch('tooltipShow', 'tooltipHide', 'stateChange', 'changeState')
    , transitionDuration = 250
    ;

  xAxis
    .orient('bottom')
    .tickPadding(7)
    ;
  yAxis
    .orient( (rightAlignYAxis) ? 'right' : 'left')
    ;

  //============================================================


  //============================================================
  // Private Variables
  //------------------------------------------------------------

  var showTooltip = function(e, offsetElement) {

    // New addition to calculate position if SVG is scaled with viewBox, may move TODO: consider implementing everywhere else
    if (offsetElement) {
      var svg = d3.select(offsetElement).select('svg');
      var viewBox = (svg.node()) ? svg.attr('viewBox') : null;
      if (viewBox) {
        viewBox = viewBox.split(' ');
        var ratio = parseInt(svg.style('width')) / viewBox[2];
        e.pos[0] = e.pos[0] * ratio;
        e.pos[1] = e.pos[1] * ratio;
      }
    }

    var left = e.pos[0] + ( offsetElement.offsetLeft || 0 ),
        top = e.pos[1] + ( offsetElement.offsetTop || 0),
        x = xAxis.tickFormat()(bars.x()(e.point, e.pointIndex)),
        y = yAxis.tickFormat()(bars.y()(e.point, e.pointIndex)),
        content = tooltip(e.series.key, x, y, e, chart);

    nv.tooltip.show([left, top], content, null, null, offsetElement);
  };

  //============================================================


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

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


      chart.update = function() { container.transition().duration(transitionDuration).call(chart) };
      chart.container = this;

      //set state.disabled
      state.disabled = data.map(function(d) { return !!d.disabled });

      if (!defaultState) {
        var key;
        defaultState = {};
        for (key in state) {
          if (state[key] instanceof Array)
            defaultState[key] = state[key].slice(0);
          else
            defaultState[key] = state[key];
        }
      }

      //------------------------------------------------------------
      // Display noData message if there's nothing to show.

      if (!data || !data.length || !data.filter(function(d) { return d.values.length }).length) {
        var noDataText = container.selectAll('.nv-noData').data([noData]);

        noDataText.enter().append('text')
          .attr('class', 'nvd3 nv-noData')
          .attr('dy', '-.7em')
          .style('text-anchor', 'middle');

        noDataText
          .attr('x', margin.left + availableWidth / 2)
          .attr('y', margin.top + availableHeight / 2)
          .text(function(d) { return d });

        return chart;
      } else {
        container.selectAll('.nv-noData').remove();
      }

      //------------------------------------------------------------


      //------------------------------------------------------------
      // Setup Scales

      x = bars.xScale();
      y = bars.yScale();

      //------------------------------------------------------------


      //------------------------------------------------------------
      // Setup containers and skeleton of chart

      var wrap = container.selectAll('g.nv-wrap.nv-historicalBarChart').data([data]);
      var gEnter = wrap.enter().append('g').attr('class', 'nvd3 nv-wrap nv-historicalBarChart').append('g');
      var g = wrap.select('g');

      gEnter.append('g').attr('class', 'nv-x nv-axis');
      gEnter.append('g').attr('class', 'nv-y nv-axis');
      gEnter.append('g').attr('class', 'nv-barsWrap');
      gEnter.append('g').attr('class', 'nv-legendWrap');

      //------------------------------------------------------------


      //------------------------------------------------------------
      // Legend

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

        g.select('.nv-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('.nv-legendWrap')
            .attr('transform', 'translate(0,' + (-margin.top) +')')
      }

      //------------------------------------------------------------

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

      if (rightAlignYAxis) {
        g.select(".nv-y.nv-axis")
            .attr("transform", "translate(" + availableWidth + ",0)");
      }


      //------------------------------------------------------------
      // Main Chart Component(s)

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


      var barsWrap = g.select('.nv-barsWrap')
          .datum(data.filter(function(d) { return !d.disabled }))

      barsWrap.transition().call(bars);

      //------------------------------------------------------------


      //------------------------------------------------------------
      // Setup Axes

      if (showXAxis) {
        xAxis
          .scale(x)
          .tickSize(-availableHeight, 0);

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

      if (showYAxis) {
        yAxis
          .scale(y)
          .ticks( availableHeight / 36 )
          .tickSize( -availableWidth, 0);

        g.select('.nv-y.nv-axis')
          .transition()
            .call(yAxis);
      }
      //------------------------------------------------------------


      //============================================================
      // Event Handling/Dispatching (in chart's scope)
      //------------------------------------------------------------

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

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

        state.disabled = data.map(function(d) { return !!d.disabled });
        dispatch.stateChange(state);

        selection.transition().call(chart);
      });

      legend.dispatch.on('legendDblclick', function(d) {
          //Double clicking should always enable current series, and disabled all others.
          data.forEach(function(d) {
             d.disabled = true;
          });
          d.disabled = false;  

          state.disabled = data.map(function(d) { return !!d.disabled });
          dispatch.stateChange(state);
          chart.update();
      });

      dispatch.on('tooltipShow', function(e) {
        if (tooltips) showTooltip(e, that.parentNode);
      });


      dispatch.on('changeState', function(e) {

        if (typeof e.disabled !== 'undefined') {
          data.forEach(function(series,i) {
            series.disabled = e.disabled[i];
          });

          state.disabled = e.disabled;
        }

        selection.call(chart);
      });

      //============================================================

    });

    return chart;
  }


  //============================================================
  // Event Handling/Dispatching (out of chart's scope)
  //------------------------------------------------------------

  bars.dispatch.on('elementMouseover.tooltip', function(e) {
    e.pos = [e.pos[0] +  margin.left, e.pos[1] + margin.top];
    dispatch.tooltipShow(e);
  });

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

  dispatch.on('tooltipHide', function() {
    if (tooltips) nv.tooltip.cleanup();
  });

  //============================================================


  //============================================================
  // Expose Public Variables
  //------------------------------------------------------------

  // expose chart's sub-components
  chart.dispatch = dispatch;
  chart.bars = bars;
  chart.legend = legend;
  chart.xAxis = xAxis;
  chart.yAxis = yAxis;

  d3.rebind(chart, bars, 'defined', 'isArea', 'x', 'y', 'size', 'xScale', 'yScale', 
    'xDomain', 'yDomain', 'xRange', 'yRange', 'forceX', 'forceY', 'interactive', 'clipEdge', 'clipVoronoi', 'id', 'interpolate','highlightPoint','clearHighlights', 'interactive');

  chart.options = nv.utils.optionsFunc.bind(chart);
  
  chart.margin = function(_) {
    if (!arguments.length) return margin;
    margin.top    = typeof _.top    != 'undefined' ? _.top    : margin.top;
    margin.right  = typeof _.right  != 'undefined' ? _.right  : margin.right;
    margin.bottom = typeof _.bottom != 'undefined' ? _.bottom : margin.bottom;
    margin.left   = typeof _.left   != 'undefined' ? _.left   : margin.left;
    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 = nv.utils.getColor(_);
    legend.color(color);
    return chart;
  };

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

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

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

  chart.rightAlignYAxis = function(_) {
    if(!arguments.length) return rightAlignYAxis;
    rightAlignYAxis = _;
    yAxis.orient( (_) ? 'right' : 'left');
    return chart;
  };

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

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

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

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

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

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

  //============================================================


  return chart;
}