////////////////////////////////////////////////////////////
//////////////////////// Set-up ////////////////////////////
////////////////////////////////////////////////////////////

var screenWidth = $(window).width();

var margin = {left: 50, top: 10, right: 50, bottom: 10},
	width = Math.min(screenWidth, 837) - margin.left - margin.right,
	height = Math.min(screenWidth, 1000)*5/6 - margin.top - margin.bottom;
			
var svg = d3.select("#chart").append("svg")
			.attr("width", (width + margin.left + margin.right))
			.attr("height", (height + margin.top + margin.bottom));
			
var wrapper = svg.append("g").attr("class", "chordWrapper")
			.attr("transform", "translate(" + (width / 2 + margin.left) + "," + (height / 2 + margin.top) + ")");;
			
var outerRadius = Math.min(width, height) / 2  - 38,
	innerRadius = outerRadius * 0.95,
	opacityDefault = 0.7; //default opacity of chords
	
////////////////////////////////////////////////////////////
////////////////////////// Data ////////////////////////////
////////////////////////////////////////////////////////////

var Names = ["JP_C_rice","JP_C_vege","JP_C_beet","JP_C_crop","JP_C_catt","JP_C_poul","JP_C_milk","JP_C_log","JP_C_fish","JP_P_catt","JP_P_pigs","JP_P_poul","JP_P_meat","JP_P_veol","JP_P_milk","JP_P_rice","JP_P_sugr","JP_P_food","JP_M_beve","JP_M_fish","JP_M_toba","JP_M_text","JP_M_wear","JP_M_lead","JP_MaL","JP_MaH","JP_EW","JP_SV","JP_WS","CN_C_rice","CN_C_whet","CN_C_cere","CN_C_vege","CN_C_veol","CN_C_beet","CN_C_fibe","CN_C_crop","CN_C_catt","CN_C_milk","CN_C_fish","CN_M_text","CN_M_wear","CN_MaL","CN_MaH","CN_SV","CN_WS"];

var matrix = [
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[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,7.24456896239267,2.48625986641241,6.87104300249218,6.49665258620817,0,3.24343024996437,1.37279212903782,1.78374973058659,0,0,0,0,0,0,0,0,0],
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[0,0,0,1.13910136439848,0,0,1.3279361378114,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
[0,0,0,1.39150453125183,0,0,2.49494170609481,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
[0,0,0,1.65724647879036,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
[2.77809612376032,3.44260309842666,1.71321353489778,11.8911223805324,4.40765995386462,0,5.41691964671411,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
[4.97294974724892,8.30105718836724,3.11804152792467,8.01870596787135,4.5433489565773,0,5.63724170592827,0,1.83979866311464,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
[0,1.00107289007028,0,1.24856615179079,0,0,1.11149989458434,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
];

var chord = d3.layout.chord()
	.padding(.02)
	.sortSubgroups(d3.descending) //sort the chords inside an arc from high to low
	.sortChords(d3.descending) //which chord should be shown on top when chords cross. Now the biggest chord is at the bottom
	.matrix(matrix);

var arc = d3.svg.arc()
	.innerRadius(innerRadius)
	.outerRadius(outerRadius);

var path = d3.svg.chord()
	.radius(innerRadius);
	
var fill = d3.scale.ordinal()
    .domain(d3.range(Names.length))
    .range(["#9fe901","#01e8fd","#fb31dd","#f9fd01","#7701fd"]);

////////////////////////////////////////////////////////////
//////////////////// Draw outer Arcs ///////////////////////
////////////////////////////////////////////////////////////

var g = wrapper.selectAll("g.group")
	.data(chord.groups)
	.enter().append("g")
	.attr("class", "group");;

g.append("path")
	.style("stroke", function(d) { return fill(d.index); })
	.style("fill", function(d) { return fill(d.index); })
	.attr("d", arc);

////////////////////////////////////////////////////////////
////////////////////// Append Names ////////////////////////
////////////////////////////////////////////////////////////

g.append("text")
	.each(function(d) { d.angle = ((d.startAngle + d.endAngle) / 2);})
	.attr("dy", ".35em")
	.attr("class", "titles")
	.attr("text-anchor", function(d) { return d.angle > Math.PI ? "end" : null; })
	.attr("transform", function(d,i) { 
		var c = arc.centroid(d);
		return "rotate(" + (d.angle * 180 / Math.PI - 90) + ")"
		+ "translate(" + (innerRadius + 27) + ")"
		+ (d.angle > Math.PI ? "rotate(180)" : "")
	})
	.text(function(d,i) { return Names[i]; });

//+ "translate(" + (innerRadius + 55) + ")"

////////////////////////////////////////////////////////////
//////////////////// Draw inner chords /////////////////////
////////////////////////////////////////////////////////////
 
var colors = ["#3fcf73","#ead63d","#01e8fd","#fc2f2f","#843fcf"];
var chords = wrapper.selectAll("path.chord")
	.data(chord.chords)
	.enter().append("path")
	.attr("class", "chord")
	.style("stroke", "none")
	.style("fill", function(d,i) { return fill(d.target.index); })
	.style("opacity", opacityDefault)
	.attr("d", path);	

////////////////////////////////////////////////////////////
///////////////////////// Tooltip //////////////////////////
////////////////////////////////////////////////////////////

//Arcs
g.append("title")	
	.text(function(d, i) {return Math.round(d.value) + " food in " + Names[i];});
	
//Chords
chords.append("title")
	.text(function(d) {
		return [Math.round(d.source.value), " food from ", Names[d.target.index], " to ", Names[d.source.index]].join(""); 
	});