(function() {

// Chart design based on the recommendations of Stephen Few. Implementation
// based on the work of Clint Ivy, Jamie Love, and Jason Davies.
// http://projects.instantcognition.com/protovis/bulletchart/
d3.bullet = function() {
  var orient = "left", //TODO top & bottom
      reverse = false,
      duration = 0,
      ranges = bulletRanges,
      markers = bulletMarkers,
      measures = bulletMeasures,
      width = 380,
      height = 30,
      tickFormat = null;

  // For each small multiple…
  function bullet(g) {
    g.each(function(d, i) {
      var rangez = ranges.call(this, d, i).slice().sort(d3.descending),
          markerz = markers.call(this, d, i).slice().sort(d3.descending),
          measurez = measures.call(this, d, i).slice().sort(d3.descending),
          g = d3.select(this);

     
      var x1 = d3.scale.linear() //determines what the x-scale is
          // .domain([0, Math.max(rangez[0], markerz[0], measurez[0])])
      		//.domain([.75*rangez[2],rangez[0]]) 
      		.domain([0,rangez[0]])
      		.range([0,width]);
      		//.range(reverse ? [width, 0] : [0, width]);

      // Retrieve the old x-scale, if this is an update.
      var x0 = this.__chart__ || d3.scale.linear()
          .domain([0, Infinity])
          .range(x1.range());

      // Stash the new scale.
//       this.__chart__ = x1; 

      // Derive width-scales from the x-scales.
      var w0 = bulletWidth(x0),
          w1 = bulletWidth(x1);

      // Update the range rects.
      var range = g.selectAll("rect.range")
          .data(rangez);

      range.enter().append("rect")
          .attr("class", function(d, i) { return "range s" + i; })
          .attr("width", w0)
          .attr("height", height)
          .attr("x", reverse ? x0 : 0)
        .transition()
          .duration(duration)
          .attr("width", w1)
          .attr("x", reverse ? x1 : 0);

      range.transition()
          .duration(duration)
          .attr("x", reverse ? x1 : 0) //placement of the start of the range?
          .attr("width", w1)
          .attr("height", height);

      // Update the measure rects.
      var measure = g.selectAll("rect.measure")
          .data(measurez);

      measure.enter().append("rect")
          .attr("class", function(d, i) { return "measure s" + i; })
          .attr("width", w0)
          .attr("height", height / 3)
          .attr("x", reverse ? x0 : 0)
          .attr("y", height / 3)
        .transition()
          .duration(duration)
          .attr("width", w1)
          .attr("x", reverse ? x1 : 0);

      measure.transition()
          .duration(duration)
          .attr("width", w1)
          .attr("height", height / 1.75) //changes size of the purple bar
          .attr("x", reverse ? x1 : 0)
          .attr("y", height / 4.25); //changes placement of the purple bar
      
      //Adds the value to the end of the bar
      var measureLabel = g.selectAll("text.measure1")
          .data(measurez);

      measureLabel.enter().append("text")
          .attr("class", function(d, i) { return "measure1 s" + i; })
          .attr("dy", "1.25em") //determines height within the graph
        	.attr("dx", "-2.25em") //determines where on the xaxis the value falls
          .text(function(d){return d + "%"})
          .attr("x", reverse ? function(d) { return w0(d) + x0(d); } : w0)
          .attr("y", height / 6)

      measureLabel.transition()
          .duration(duration)
          .attr("x", reverse ? function(d) { return w1(d) + x1(d); } : w1);

      // Update the marker lines.
//       var marker = g.selectAll("line.marker")
//           .data(markerz);

//       marker.enter().append("line")
//           .attr("class", "marker")
//           .attr("x1", x0)
//           .attr("x2", x0)
//           .attr("y1", height / 6)
//           .attr("y2", height * 5 / 6)
//         .transition()
//           .duration(duration)
//           .attr("x1", x1)
//           .attr("x2", x1);

//       marker.transition()
//           .duration(duration)
//           .attr("x1", x1)
//           .attr("x2", x1)
//           .attr("y1", height / 6)
//           .attr("y2", height * 5 / 6);

      // Compute the tick format.
      var format = tickFormat || x1.tickFormat(8);

      // Update the tick groups.
      var tick = g.selectAll("g.tick")
          .data(x1.ticks(5), function(d) { //Determines number of values on axis
            return this.textContent || format(d);
          });

      // Initialize the ticks with the old scale, x0.
      var tickEnter = tick.enter().append("g")
          .attr("class", "tick")
          .attr("transform", bulletTranslate(x0))
          .style("opacity", 1e-6);

//       tickEnter.append("line")
//           .attr("y1", height)
//           .attr("y2", height * 7 / 6);

      tickEnter.append("text")
          .attr("text-anchor", "middle")
          .attr("dy", "1em") //how far below the xaxis values are
          .attr("y", height * 7 / 6)
          .text(format);

      // Transition the entering ticks to the new scale, x1.
      tickEnter.transition()
          .duration(duration)
          .attr("transform", bulletTranslate(x1))
          .style("opacity", 1);

      // Transition the updating ticks to the new scale, x1.
//       var tickUpdate = tick.transition()
//           .duration(duration)
//           .attr("transform", bulletTranslate(x1))
//           .style("opacity", 1);

//       tickUpdate.select("line")
//           .attr("y1", height)
//           .attr("y2", height * 7 / 6);

//       tickUpdate.select("text")
//           .attr("y", height * 7 / 6);

      // Transition the exiting ticks to the new scale, x1.
//       tick.exit().transition()
//           .duration(duration)
//           .attr("transform", bulletTranslate(x1))
//           .style("opacity", 1e-6)
//           .remove();
    });
    d3.timer.flush();
  }

  // left, right, top, bottom
//   bullet.orient = function(x) {
//     if (!arguments.length) return orient;
//     orient = x;
//     reverse = orient == "right" || orient == "bottom";
//     return bullet;
//   };

  // ranges (bad, satisfactory, good)
//   bullet.ranges = function(x) {
//     if (!arguments.length) return ranges;
//     ranges = x;
//     return bullet;
//   };

  // markers (previous, goal)
//   bullet.markers = function(x) {
//     if (!arguments.length) return markers;
//     markers = x;
//     return bullet;
//   };

  // measures (actual, forecast)
//   bullet.measures = function(x) {
//     if (!arguments.length) return measures;
//     measures = x;
//     return bullet;
//   };

  bullet.width = function(x) {
    if (!arguments.length) return width;
    width = x;
    return bullet;
  };

  bullet.height = function(x) {
    if (!arguments.length) return height;
    height = x;
    return bullet;
  };

//   bullet.tickFormat = function(x) {
//     if (!arguments.length) return tickFormat;
//     tickFormat = x;
//     return bullet;
//   };

//   bullet.duration = function(x) {
//     if (!arguments.length) return duration;
//     duration = x;
//     return bullet;
//   };

  return bullet;
};

function bulletRanges(d) {
  return d.ranges;
}

function bulletMarkers(d) {
  return d.markers;
}

function bulletMeasures(d) {
  return d.measures;
}

function bulletTranslate(x) {
  return function(d) {
    return "translate(" + x(d) + ",0)";
  };
}

function bulletWidth(x) {
  var x0 = x(0);
  return function(d) {
    return Math.abs(x(d) - x0);
  };
}

})();