var margin = {top: 20, right: 20, bottom: 20, left: 20};
	width = 800 - margin.left - margin.right,
	height = 500 - margin.top - margin.bottom,
	formatSubtraction = d3.format("100");

var svg = d3.select("#map").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 + ")");

tooltip = d3.select("body").append("div")
	.attr("class", "tooltip")
	.style("opacity", 0);

queue()
	.defer(d3.csv, "lyme-data.csv")
	.defer(d3.json, "us.json")
	.await(ready);

var legendText = ["", "10", "", "15", "", "20", "", "25"];
var legendColors = ['#ffe4b5','#f1ce9f','#e3b989','#d5a575','#c79061','#b97c4d','#ab683b','#a0522d'
];


function ready(error, data, us) {

	var counties = topojson.feature(us, us.objects.counties);

	data.forEach(function(d) {
		d.year = +d.year;
		d.fips = +d.fips;
		d.rate = +d.rate;
	});

	var dataByCountyByYear = d3.nest()
		.key(function(d) { return d.fips; })
		.key(function(d) { return d.year; })
		.map(data);

	counties.features.forEach(function(county) {
		county.properties.years = dataByCountyByYear[+county.id]
	});

	var color = d3.scale.threshold()
		.domain([10, 12.5, 15, 17.5, 20, 22.5, 25])
		.range(['#ffe4b5','#f1ce9f','#e3b989','#d5a575','#c79061','#b97c4d','#ab683b','#a0522d'
]);

	var projection = d3.geo.albersUsa()
		.translate([width / 2, height / 2]);

	var path = d3.geo.path()
		.projection(projection);

	var countyShapes = svg.selectAll(".county")
		.data(counties.features)
		.enter()
		.append("path")
			.attr("class", "county")
			.attr("d", path);

	countyShapes
		.on("mouseover", function(d) {
			tooltip.transition()
			.duration(250)
			.style("opacity", 1);
			tooltip.html(
			"<p><strong>" + d.properties.years[2000][0].county + ", " + d.properties.years[2000][0].state + "</strong></p>" +
			"<table><tbody><tr><td class='wide'>Reported Lyme Cases in 2000:</td><td>" + formatSubtraction((d.properties.years[2000][0].rate)) + "</td></tr>" +
			"<tr><td>Reported Lyme Cases in 2015:</td><td>" + formatSubtraction((d.properties.years[2015][0].rate)) + "</td></tr>" +
			"<tr><td>Change:</td><td>" + formatSubtraction((d.properties.years[2015][0].rate-d.properties.years[2000][0].rate)) + "</td></tr></tbody></table>"
			)
			.style("left", (d3.event.pageX + 15) + "px")
			.style("top", (d3.event.pageY - 28) + "px");
		})
		.on("mouseout", function(d) {
			tooltip.transition()
			.duration(250)
			.style("opacity", 0);
		});

	svg.append("path")
		.datum(topojson.feature(us, us.objects.states, function(a, b) { return a !== b; }))
			.attr("class", "states")
			.attr("d", path);

	var legend = svg.append("g")
		.attr("id", "legend");

	var legenditem = legend.selectAll(".legenditem")
		.data(d3.range(8))
		.enter()
		.append("g")
			.attr("class", "legenditem")
			.attr("transform", function(d, i) { return "translate(" + i * 31 + ",0)"; });

	legenditem.append("rect")
		.attr("x", width - 240)
		.attr("y", -7)
		.attr("width", 30)
		.attr("height", 6)
		.attr("class", "rect")
		.style("fill", function(d, i) { return legendColors[i]; });

	legenditem.append("text")
		.attr("x", width - 240)
		.attr("y", -10)
		.style("text-anchor", "middle")
		.text(function(d, i) { return legendText[i]; });

	function update(year){
		slider.property("value", year);
		d3.select(".year").text(year);
		countyShapes.style("fill", function(d) {
			return color(d.properties.years[year][0].rate)
		});
	}

	var slider = d3.select(".slider")
		.append("input")
			.attr("type", "range")
			.attr("min", 2000)
			.attr("max", 2015)
			.attr("step", 1)
			.on("input", function() {
				var year = this.value;
				update(year);
			});

update(2000);

}

d3.select(self.frameElement).style("height", "685px");