var margin = {top: 80, right: 180, bottom: 80, left: 180},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

var colors = d3.scale.category20().domain([0, 100]);

var x = d3.scale.ordinal()
    .rangeRoundBands([0, width], .1, .3);

var y = d3.scale.linear()
    .range([height, 0]);


var xAxis = d3.svg.axis()
    .scale(x)
    .orient("bottom");

var yAxis = d3.svg.axis()
    .scale(y)
    .orient("left")
    .ticks(8, "%");

var svg = d3.select("body").append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
  .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

d3.tsv("data.tsv", type, function(error, data) {
  x.domain(data.map(function(d) { return d.name; }));
  y.domain([0, d3.max(data, function(d) { return d.value; })]);

  svg.append("text")
      .attr("class", "title")
      .attr("x", x(data[0].name))
      .attr("y", -26)
      .text("Why Are We Leaving Facebook?");

  svg.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height + ")")
      .call(xAxis)
    .selectAll(".tick text")
       .call(wrap, x.rangeBand())
       .selectAll("tspan")
       .style('stroke', 'none')
       .style('fill', function(d, i) { return colors(d.length) });

  svg.append("g")
      .attr("class", "y axis")
      .call(yAxis);

  svg.selectAll(".bar")
      .data(data)
    .enter().append("rect")
      .attr("class", "bar")
      .attr("x", function(d) { return x(d.name); })
      .attr("width", x.rangeBand())
      .attr("y", function(d) { return y(d.value); })
      .attr("height", function(d) { return height - y(d.value); });
});

function wrap(text, width) {
    text.each(function() {
        var text = d3.select(this),
            words = text.text().split(/\s+/).reverse(),
            word,
            lines = [],
            line = [],
            lineNumber = 0,
            lineHeight = 1.1, // ems
            y = text.attr("y"),
            dy = parseFloat(text.attr("dy"));
            gauge_tspan = text.text(null).append("tspan").style('opacity', 0);
        
        lines.push(line);
        while (word = words.pop()) {
            line.push(word);
            gauge_tspan.text(line.join(" "));
            if (gauge_tspan.node().getComputedTextLength() > width) {
                line.pop();
                line = [word];
                lines.push(line);
            };
        }
        
        var tspans = 
            text
                .text(null)
                .selectAll('tpan')
                .data(lines.map(function(line) { return line.join(" ") }));
        tspans.exit().remove();
        tspans.enter()
            .append("tspan")
            .attr("x", 0)
            .attr("y", y)
        tspans
            .text(function(line) { return line })
            .attr("dy", function(line, index) { return dy + index * lineHeight + "em" })
    });
}

function mikes_wrap(text, width) {
    text.each(function() {
      var text = d3.select(this),
          words = text.text().split(/\s+/).reverse(),
          word,
          line = [],
          lineNumber = 0,
          lineHeight = 1.1, // ems
          y = text.attr("y"),
          dy = parseFloat(text.attr("dy")),
          tspan = text.text(null).append("tspan").attr("x", 0).attr("y", y).attr("dy", dy + "em");
      while (word = words.pop()) {
        line.push(word);
        tspan.text(line.join(" "));
        if (tspan.node().getComputedTextLength() > width) {
          line.pop();
          tspan.text(line.join(" "));
          line = [word];
          tspan = text.append("tspan").attr("x", 0).attr("y", y).attr("dy", ++lineNumber * lineHeight + dy + "em").text(word);
        }
      }
    });
  }


function type(d) {
  d.value = +d.value;
  return d;
}