var dataset = {
  apples: [12.1/14.81,1-12.1/14.81],
  oranges: [200, 200, 200, 200]
};

var width = 350,
  height = 230,
  radius = Math.min(width, height) / 2;

var enterClockwise = {
  startAngle: 0,
  endAngle: 0
};

var enterAntiClockwise = {
  startAngle: Math.PI * 2,
  endAngle: Math.PI * 2
};

//var color = d3.scale.category20();
var color = d3.scale.ordinal()
    .range(["#189eba", "#3c1ba7", "#189eba", "#3c1ba7", "#4f1469", "#d0743c", "#ff8c00"]);

var pie = d3.layout.pie()
  .sort(null);

var arc = d3.svg.arc()
  .innerRadius(radius - 30)
  .outerRadius(radius - 10);

var svg = d3.select("#donut").append("svg")
  .attr("width", width)
  .attr("height", height)
  .append("g")
  .attr("transform", "translate(" + width / 2 + "," + height / 2 + ")");

// set the start and end angles to 0 so we can transition
// clockwise to the actual values later
var path = svg.selectAll("path")
  .data(pie(dataset.apples))
  .enter().append("path")
    .attr("fill", function(d, i) { return color(i); })
    .attr("d", arc(enterClockwise))
    .each(function(d) {
      this._current = {
        data: d.data,
        value: d.value,
        startAngle: enterClockwise.startAngle,
        endAngle: enterClockwise.endAngle
      }
    }); // store the initial values
  svg.append("text")
          //.datum(pie(dataset.apples))
          .attr("x", 0 )
          .attr("y", 0 - 10.5 )
          .attr("class", "text-tooltip")        
          .style("text-anchor", "middle")
          .attr("font-weight", "bold")
          .style("font-size", radius/4.15+"px")
          .attr("fill","black")
            .text("9.32 MWh") 
            ;  
 svg.append("text")
          //.datum(pie(dataset.apples))
          .attr("x", 0 )
          .attr("y", 0 + 15.5 )
          .attr("class", "text-tooltip")        
          .style("text-anchor", "middle")
          .attr("font-weight", "bold")
          .style("font-size", radius/6.0+"px")
          .attr("fill","black")
          .text("Current Production")            
    
 svg.append("text")
          .datum(pie(dataset.apples))
          .attr("x", 0 )
          .attr("y", 0 + radius/10 )
          .attr("class", "text-tooltip")        
          .style("text-anchor", "middle")
          .attr("font-weight", "bold")
          .style("font-size", radius/2.5+"px");
path.transition()  // update
    .duration(750)
    .attrTween("d", arcTween);




d3.selectAll("input").on("change", change);

var timeout = setTimeout(function() {
  d3.select("input[value=\"oranges\"]").property("checked", true).each(change);
}, 2000);

function change() {
  clearTimeout(timeout);
  path = path.data(pie(dataset[this.value])); // update the data
  // set the start and end angles to Math.PI * 2 so we can transition
  // anticlockwise to the actual values later
  path.enter().append("path")
      .attr("fill", function (d, i) {
        return color(i);
      })
      .attr("d", arc(enterAntiClockwise))
      .each(function (d) {
        this._current = {
          data: d.data,
          value: d.value,
          startAngle: enterAntiClockwise.startAngle,
          endAngle: enterAntiClockwise.endAngle
        };
      }); // store the initial values

  path.exit()
      .transition()
      .duration(750)
      .attrTween('d', arcTweenOut)
      .remove() // now remove the exiting arcs

  path.transition().duration(750).attrTween("d", arcTween); // redraw the arcs
}

// Store the displayed angles in _current.
// Then, interpolate from _current to the new angles.
// During the transition, _current is updated in-place by d3.interpolate.
function arcTween(a) {
  var i = d3.interpolate(this._current, a);
  this._current = i(0);
  return function(t) {
  return arc(i(t));
  };
}
function arcTweenOut(a) {
  var i = d3.interpolate(this._current, {startAngle: Math.PI * 2, endAngle: Math.PI * 2, value: 0});
  this._current = i(0);
  return function (t) {
    return arc(i(t));
  };
}