var dataBlock = "/milroc/raw/9842179/";

var interactionMin = 40;
var margin = {top: 100, right: 20, bottom: 30, left: 40},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

var formatPercent = d3.format(".0%"),
    tooltipPercent = d3.format(".2%");

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

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")
    .tickFormat(formatPercent);

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(dataBlock + "letter.tsv", function(error, data) {

  data.forEach(function(d) {
    d.frequency = +d.frequency;
  });

  x.domain(data.map(function(d) { return d.letter; }));
  y.domain([0, d3.max(data, function(d) { return d.frequency; })]);

  svg.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height + ")")
      .call(xAxis);

  svg.append("g")
      .attr("class", "y axis")
      .call(yAxis)
    .append("text")
      .attr("transform", "rotate(-90)")
      .attr("y", 6)
      .attr("dy", ".71em")
      .style("text-anchor", "end")
      .text("Frequency");

  var tip = d3.tip()
              .attr('class', 'd3-tip')
              .offset([-10, 0])
              .html(function(d) {
                return '<h5>' + d.letter + '</h5><p>' + tooltipPercent(d.frequency) + '</p>';
              });

  svg.call(tip);
  var bars = svg.selectAll(".bar")
      .data(data),
      barsEnter = bars.enter().append("g")
                        .classed('bar', true)
                        .attr({
                          transform: function(d) { return 'translate(' + x(d.letter) + ',' + 0 + ')'; },
                        }),
      displayEnter = barsEnter.append('rect')
                                  .classed('display', true)
                                  .attr({
                                    width: x.rangeBand(),
                                    height: function(d) { return height - y(d.frequency); },
                                    y: function(d) { return y(d.frequency); }
                                  }),
      interactEnter = barsEnter.append('rect')
                                  .classed('interact', true)
                                  .attr({
                                    width: x.rangeBand(),
                                    height: function(d) {
                                      var size = height - y(d.frequency);
                                      return (size < interactionMin)?interactionMin:size;
                                    },
                                    y: function(d) {
                                      var size = height - y(d.frequency);
                                      return (size < interactionMin)?height - interactionMin:y(d.frequency);
                                    },
                                    'fill-opacity': 0.0,
                                  })
                                  .on('mouseover', tip.show)
                                  .on('mouseout', tip.hide);

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

  var sortTimeout = setTimeout(function() {
    d3.select("input").property("checked", true).each(change);
  }, 2000);

  function change() {
    clearTimeout(sortTimeout);

    // Copy-on-write since tweens are evaluated after a delay.
    var x0 = x.domain(data.sort(this.checked
        ? function(a, b) { return b.frequency - a.frequency; }
        : function(a, b) { return d3.ascending(a.letter, b.letter); })
        .map(function(d) { return d.letter; }))
        .copy();

    var transition = svg.transition().duration(750),
        delay = function(d, i) { return i * 50; };

    transition.selectAll(".bar")
        .delay(delay)
        .attr({
          transform: function(d) { return 'translate(' + x0(d.letter) + ',' + 0 + ')'; },
        });

    transition.select(".x.axis")
        .call(xAxis)
      .selectAll("g")
        .delay(delay);
  }
});