(function($){
	
	$.fn.geoflow = function(options){

		var providername = options.providername;
		var NPI = options.NPI;
		var color = d3.scale.category20();

		var LEAKAGE_LINES = '#d62728',
			LOYAL_LINES = '#005C85',
			COMPETITOR_NODES = '#756bb1',
			SELECTED_HOSPITAL_NODE = '#2ca02c',
			LEAKAGE_THRESHOLD = [0, 12.5, 25.0, 37.5, 50.0, 62.5, 75.0, 87.5],
			LINK_OPACITY = 0.6,
			NODE_OPACITY = 0.7,
			MAP_ZOOM = 8,
			RECENT_LIST_LENGTH = 9,
			// legend vars
			SVG_CIRCLE_HEIGHT = 16,
			SVG_CIRCLE_WIDTH = 20,
			LEGEND_CX = 8,
			LEGEND_CY = 8,
			LEGEND_RADIUS = 8,
			SVG_LINE_HEIGHT = 5,
			SVG_LINE_WIDTH = 20,
			LEGEND_STROKE_WIDTH = 5,
			LEGEND_X1 = 0,
			LEGEND_Y1 = 0,
			LEGEND_X2 = 16,
			LEGEND_Y2 = 0;

		var uniq = function(a) {
		   return Array.from(new Set(a));
		}

		var getCheckedInputs = function(opt){
			// get all checked NPIs
	    	var checked = []
	    	d3.selectAll('.recentInputList')[0].forEach(function(v, k){
		    	if (opt == 'checked'){
		    		if ($(v)[0].checked){
		    			checked.push($(v)[0].id)
		    		}
		    	} else if (opt == 'all'){
	    			checked.push($(v)[0].id)
		    	}
	    	})
	    	return checked;
	    };

		$('body').append('<div id="tooltip" class="hidden">'
					+ '<p><span id="heading"></span></p>'
					+ '<p><span id="visits"></span></p>'
					+ '<p><span id="otherinfo"></span></p>'
					+ '</div>')

		// Set leaflet map
		var map = new L.map(this[0].id, {
				center: new L.LatLng(39.095963, -95.976563),
				// center: new L.LatLng(options.center.lat, options.center.lon),
				zoom: options.zoom,
				layers: [
					new L.tileLayer('http://{s}tile.stamen.com/toner-lite/{z}/{x}/{y}.png', {
						subdomains: ['','a.','b.','c.','d.'],
						attribution: 'Map tiles by <a href="http://stamen.com" target="_blank">Stamen Design</a>, under <a href="http://creativecommons.org/licenses/by/3.0" target="_blank">CC BY 3.0</a>. Data by <a href="http://openstreetmap.org" target="_blank">OpenStreetMap</a>, under <a href="http://creativecommons.org/licenses/by-sa/3.0" target="_blank">CC BY SA</a>'
					})
				]
	        });
		 
		// Initialize the SVG layer
		map._initPathRoot();
		map.doubleClickZoom.disable(); 

		// Setup svg element to work with
		var svg = d3.select(this.selector).select("svg"),
		    linklayer = svg.append("g"),
		    nodelayer = svg.append("g"),
		    headerText, bodyText, 
		    showingAll = false,
		    hoveredOverHospitalNode = false,
		    selectedNPI = NPI,
		    linkType = 'target',
		    ignoreHover = false;

		var formatNumber = d3.format(",d");

	    var linksLegend = L.control({position: 'bottomright'});
		linksLegend.onAdd = function (map) {
		    var div = L.DomUtil.create('div', 'info legend');
	        div.innerHTML = '<div id="linksLegend">'
	        			  + '<svg height="'+SVG_LINE_HEIGHT+'" width="'+SVG_LINE_WIDTH+'">'
						  +    '<line x1="'+LEGEND_X1+'" y1="'+LEGEND_Y1+'" x2="'+LEGEND_X2+'" y2="'+LEGEND_Y2+'" style="stroke:'+LEAKAGE_LINES+';stroke-width:'+LEGEND_STROKE_WIDTH+';opacity:'+LINK_OPACITY+';"/>'
						  +    '</svg> Visits to Similar Providers'
			              + '<br><svg height="'+SVG_LINE_HEIGHT+'" width="'+SVG_LINE_WIDTH+'">'
						  +    '<line x1="'+LEGEND_X1+'" y1="'+LEGEND_Y1+'" x2="'+LEGEND_X2+'" y2="'+LEGEND_Y2+'" style="stroke:'+LOYAL_LINES+';stroke-width:'+LEGEND_STROKE_WIDTH+';opacity:'+LINK_OPACITY+';"/>'
						  +    '</svg> Visits to Selected Provider'
			              + '<br><svg height="'+SVG_CIRCLE_HEIGHT+'" width="'+SVG_CIRCLE_WIDTH+'">'
						  +    '<circle cx="'+LEGEND_CX+'" cy="'+LEGEND_CY+'" r="'+LEGEND_RADIUS+'" opacity="'+NODE_OPACITY+'" style="fill:'+COMPETITOR_NODES+';opacity:'+NODE_OPACITY+';">'
						  +    '</circle>'
						  + '</svg> Similar Providers'
						  + '<br><svg height="'+SVG_CIRCLE_HEIGHT+'" width="'+SVG_CIRCLE_WIDTH+'">'
						  +    '<circle cx="'+LEGEND_CX+'" cy="'+LEGEND_CY+'" r="'+LEGEND_RADIUS+'" opacity="'+NODE_OPACITY+'" style="fill:'+SELECTED_HOSPITAL_NODE+';opacity:'+NODE_OPACITY+';">'
						  +    '</circle>'
						  + '</svg> Selected Provider'
						  + '</div>'
		    return div;
		};
		linksLegend.addTo(map);

	    var legend = L.control({position: 'bottomright'});
		legend.onAdd = function (map) {
		    var div = L.DomUtil.create('div', 'info legend');
		    // loop through our density intervals and generate a label with a colored square for each interval
		    for (var i = 0; i < LEAKAGE_THRESHOLD.length; i++) {
		        div.innerHTML +=
		        	(i == 0 ? "<p class='center-align'>Leakage %</p>" : '')
		            + '<svg height="'+SVG_CIRCLE_HEIGHT+'" width="'+SVG_CIRCLE_WIDTH+'">'
					+    '<circle cx="'+LEGEND_CX+'" cy="'+LEGEND_CY+'" r="'+LEGEND_RADIUS+'" opacity="'+NODE_OPACITY+'" style="fill:'+d3.spatialsankey().getColor(LEAKAGE_THRESHOLD[i])+';opacity:'+NODE_OPACITY+';">'
					+    '</circle>'
					+ '</svg>'
		            + (LEAKAGE_THRESHOLD[i]+(i==0 ? 0 : 0)) + (LEAKAGE_THRESHOLD[i + 1] ? ' &ndash; ' + LEAKAGE_THRESHOLD[i + 1] + '<br>' : '+')
		    }
		    return div;
		};
		legend.addTo(map);

		var ignoreHoverLegend = L.control({position: 'topright'});
		ignoreHoverLegend.onAdd = function (map) {
		    var div = L.DomUtil.create('div', 'info legend');
		    div.innerHTML =	'<div id="ignoreHoverLegend" class="checkbox">'
						  + '<label>'
						  +    '<input type="checkbox" id="ignoreHover" value="polygon">Ignore Hover'
						  + '</label><br>'
						  + '</div>'
		    return div;
		};
		ignoreHoverLegend.addTo(map);

		$('#ignoreHover').on('click', function(){
			if (!ignoreHover){
				ignoreHover = true;
			} else {
				ignoreHover = false;
			}
		});

		var recentLegend = L.control({position: 'topright'});
		recentLegend.onAdd = function (map) {
		    var div = L.DomUtil.create('div', 'info legend');
		    div.innerHTML = '<p class="center-align">Highlight Links</p>'
		    			  +	'<div id="recentLegend" class="checkbox">'
						  + '<label>'
						  +    '<input class="recentInputList" type="checkbox" id="' + NPI + '" value="polygon">' + providername
						  + '</label><br>'
						  + '</div>'
		    return div;
		};

		recentLegend.addTo(map);

		// Load data asynchronosuly
		d3.json(options.endpoint, function(geojson){ // .get data\

			// bind click event to selected hospital NPI in Recent Links on page load
			$('#'+NPI).on('click', function(){
				hideSpecificLinks(NPI);
	        	if ($(this)[0].checked){
	        		specificLinks(NPI);
	        	}
			});

			map.panTo(new L.LatLng(geojson.source.lat, geojson.source.lng));
			map.zoomIn(MAP_ZOOM);

			var nodes = geojson.nodes;
			var links = geojson.links;

            var radiusFromLatLon = function(latIn, lonIn, radius){
                var locs = [];
                var lat1 = parseFloat(latIn) * Math.PI/180.0;
                var lon1 = parseFloat(lonIn) * Math.PI/180.0;
                var d = radius/3956.0;
                var range360 = Array.apply(null, Array(360)).map(function (_, i) {return i;});
                for (var i in range360){
                    var lon, loc;
                    var tc = (range360[i] / 90.0) * Math.PI/2.0;
                    var lat = Math.asin(Math.sin(lat1)*Math.cos(d)+Math.cos(lat1)*Math.sin(d)*Math.cos(tc));
                    lat = (180.0 * lat) / Math.PI; 
                    if (Math.cos(lat1) == 0){
                        lon = lonIn;
                    } else {
                        lon = ((lon1 - Math.asin(Math.sin(tc) * Math.sin(d)/Math.cos(lat1)) + Math.PI) % (2 * Math.PI)) - Math.PI;
                    }
                    lon = (180.0 * lon) / Math.PI;
                    loc = [lat, lon];
                    locs.push(loc);
                }
                return locs;
            }

            var features = geojson.nodes.features;

            var featureKeys = Object.keys(features);
            var geocontainer = {};
            for (var i in featureKeys){
                var npi = featureKeys[i];
                var lat = features[npi].geometry.coordinates[0];
                var lon = features[npi].geometry.coordinates[1];
                var key = lat + '|' + lon;

                if (!(key in geocontainer)){
                    geocontainer[key] = {
                        npis: [npi],
                        coords: {
                            lat: lat,
                            lon: lon
                        }
                    };
                } else {
                    geocontainer[key].npis.push(npi);
                }
            }

            var radius = 2;
            var geocontainerKeys = Object.keys(geocontainer);
            for (var i in geocontainerKeys){
                var latLonKey = geocontainer[geocontainerKeys[i]]
                var npilist = latLonKey.npis;

                if (npilist.length > 1){
                    var coords = latLonKey.coords;
                    var lat = coords.lat;
                    var lon = coords.lon;
                    var circlePoints = radiusFromLatLon(lat, lon, radius);
                    countby = ((360/npilist.length) < 2) ? 2 : Math.floor(360/npilist.length);

                    for (var index=0, j=0; index<npilist.length;index+=1, j+=countby){
                        var npi = npilist[index];
                        var entitytype = features[npi].type;

                        if (entitytype == 'source' || entitytype == 'comp'){
                            features[npi].geometry.coordinates = circlePoints[j];
                        }
                    }
                }
            }

		    var spatialsankey = d3.spatialsankey()
		                            .lmap(map)
		                            .nodes(nodes.features)
		                            .links(links);
		    
		    var mouseover = function(d){ 
		    	if (!ignoreHover){
					linklayer.selectAll("path").remove();
					// Get link data for this node
					var nodelinks = spatialsankey.links().filter(function(link){
						return showingAll ? link.source : link.source == nodes.features[d].npi || link.target == nodes.features[d].npi;
					});

					// Add data to link layer
					var beziers = linklayer.selectAll("path").data(nodelinks);
					link = spatialsankey.link(options);


					// Draw new links
					beziers.enter()
						.append("path")
						.attr("d", link)
						.attr('id', function(d){return d.id})
						.style("stroke-width", spatialsankey.link().width())
						.style("stroke", function(a){
							if (!showingAll){
						    	return a.source == NPI || a.target == NPI ? LOYAL_LINES : LEAKAGE_LINES;
						    }
						})
						.on("mousemove", mouseShowTooltip)
						.on("mouseout", mouseHideTooltip);

					// Remove old links
					beziers.exit().remove();

					if (showingAll){
						beziers.transition().style("stroke", function(link){
							return link.source == nodes.features[d].npi ? LEAKAGE_LINES : LOYAL_LINES && link.target == nodes.features[d].npi ? LEAKAGE_LINES : LOYAL_LINES;
						});
					};

					// Hide inactive nodes
					var circleUnderMouse = this;
					circs.transition().style('opacity',function (d) {
					// return (this === circleUnderMouse) ? NODE_OPACITY : 0;
						return (nodes.features[d].type == "target" || nodes.features[d].type == "comp" || this === circleUnderMouse) ? NODE_OPACITY : 0;
					});
				};
				if (nodes.features[d].type == 'target' || nodes.features[d].type == 'comp'){
					hoveredOverHospitalNode = true;
				} else {
					hoveredOverHospitalNode = false;
				}
		    };

		    var mouseout = function(d) {
		    	var checked = getCheckedInputs("checked");
		    	if (!ignoreHover || checked.length == 0){
					circs.transition().style('opacity', NODE_OPACITY);
				};
				d3.select("#tooltip").classed("hidden", true);
		    };

		    var mouseShowTooltip = function(d) {
				var xPosition = d3.event.pageX - 65;
				var yPosition = d3.event.pageY > 500 ? d3.event.pageY - 140 : d3.event.pageY + 20;

				if (d.source && d.target){
					headerText = null;
					if (hoveredOverHospitalNode){
					    bodyText = '<p> ' + nodes.features[d.target].name + ' <strong>recieves</strong> ' + formatNumber(d.flow) + ' visits from ' + nodes.features[d.source].name + '</p>';
					} else {
						bodyText = '<p> ' + nodes.features[d.source].name + ' <strong>refers</strong> ' + formatNumber(d.flow) + ' visits to ' + nodes.features[d.target].name + '</p>';
					}
				} else {
					var firstname = nodes.features[d].name.replace(".", "").split(" ")[0];
					var lastname = nodes.features[d].name.replace(".", "").split(" ")[1];
					var inputs = getCheckedInputs("all");
					if (inputs.indexOf(nodes.features[d].npi) == -1){
					  	$('#recentLegend').prepend('<label><input class="recentInputList" type="checkbox" id='+nodes.features[d].npi+' value="marker">'+firstname +" "+ lastname+'</label><br>');
					}
					headerText = nodes.features[d].name;
			        var inputs = d3.selectAll("#recentLegend > label")[0];

			        inputs.forEach(function(x, i){
			        	if (i > RECENT_LIST_LENGTH){
			        		$(inputs[i]).next('br').remove();
			        		$(inputs[i]).remove();
			        	}
			        });

			        $('#'+nodes.features[d].npi).on('click', function(){
			        	hideSpecificLinks(nodes.features[d].npi)
			        	if ($(this)[0].checked){
			        		specificLinks(nodes.features[d].npi);
			        	}
			        });

			        if (hoveredOverHospitalNode){
			        	bodyText = '<p><strong>Inflow:</strong> ' + formatNumber(nodes.features[d].aggregate_inflows) 
			        } else {
			        	bodyText = '<p><strong>Outflow:</strong> ' + formatNumber(nodes.features[d].aggregate_outflows) + '</p>'
			        			 + '<p><strong>Total Charges:</strong> $' +  formatNumber(nodes.features[d].charges) + '</p>'
			        			 + '<p><strong>Leakage:</strong> ' + Math.round(nodes.features[d].leakage*10000)/100 + '%'
			        }
				}
				d3.select("#tooltip")
					.style("left", xPosition + "px")
					.style("top", yPosition + "px");

				d3.select("#tooltip #heading")
					.html(function(){
						return headerText;
				});

				d3.select("#tooltip #visits")
					.html(function(){
						return bodyText;
				});

				d3.select("#tooltip").classed("hidden", false);
		    };

		    var mouseHideTooltip = function() {
				d3.select("#tooltip").classed("hidden", true);
		    };


		    var hideSpecificLinks = function(npi){

		    	var checked = getCheckedInputs("checked");
		    	linklayer.selectAll("path").remove();
				// Get link data for this node
				var nodelinks = spatialsankey.links().filter(function(link){
					return checked.indexOf(link.target) > -1 || checked.indexOf(link.source) > -1;
				});

				// Add data to link layer
				var beziers = linklayer.selectAll("path").data(nodelinks);
				link = spatialsankey.link(options)

		      // Draw new links
				beziers.enter()
					.append("path")
					.attr("d", link)
					.attr('id', function(d){return npi})
					.style("stroke-width", spatialsankey.link().width())
					.style("stroke", function(a){
						if (!showingAll){
					    	return a.source == NPI || a.target == NPI ? LOYAL_LINES : LEAKAGE_LINES;
					    }
					})
					.on("mousemove", mouseShowTooltip)
					.on("mouseout", mouseHideTooltip);
		      
				// Remove old links
				beziers.exit().remove();

				if (showingAll){
					beziers.transition().style("stroke", function(link){
				  	return link.source == npi ? LEAKAGE_LINES : LOYAL_LINES && link.target == npi ? LEAKAGE_LINES : LOYAL_LINES;
				  });
				};

				if (linkType == 'target' || linkType == 'comp'){
					hoveredOverHospitalNode = true;
				} else {
					hoveredOverHospitalNode = false;
				}

				// Hide inactive nodes
				var circleUnderMouse = this;
				circs.transition().style('opacity',function (d) {
					var checked = getCheckedInputs('checked');
					return (nodes.features[d].type == "target" || nodes.features[d].type == "comp" || this === circleUnderMouse || checked.indexOf(nodes.features[d].npi) > -1) ? NODE_OPACITY : 0;
				});

				// show all nodes when input has none checked
				if (checked.length == 0){
		    		circs.call(mouseout);
		    	}
		    }


		    var specificLinks = function(npi){
				// Hide inactive nodes
				var circleUnderMouse = this;
				circs.transition().style('opacity',function (d) {
				  // return (this === circleUnderMouse) ? NODE_OPACITY : 0;
				  	var checked = getCheckedInputs('checked');
					return (nodes.features[d].type == "target" || nodes.features[d].type == "comp" || this === circleUnderMouse || checked.indexOf(nodes.features[d].npi) > -1) ? NODE_OPACITY : 0;
				});
		    };


			// hide tooltip when clicking outside circ
			$('body').on('click', function(e){
				var container = $('#tooltip');
				if (!container.is(e.target) && e.target.nodeName == 'svg'){
					d3.select("#tooltip").classed("hidden", true);
				}
			});

			// hide tooltip on zoom start
			map.on('zoomstart', function() {
				d3.select("#tooltip").classed("hidden", true);
			});

			// hide tooltip on move start
			map.on('movestart', function(){
				d3.select("#tooltip").classed("hidden", true);
			});

		    // Draw nodes
		    var node = spatialsankey.node();

		    var circs = nodelayer.selectAll("circle")
				.data(Object.keys(nodes.features))
				.enter()
				.append("circle")
				.attr("cx", node.cx)
				.attr("cy", node.cy)
				.attr("r", node.r)
				.style("fill", function(d){
					return node.fill(d, NPI);
				})
				.attr("opacity", NODE_OPACITY)
				.on('mouseover', mouseover)
				.on("mouseup", mouseShowTooltip)
				.on("mouseout", mouseout);

		    // Adopt size of drawn objects after leaflet zoom reset
		    var zoomend = function(){
		        linklayer.selectAll("path").attr("d", spatialsankey.link());
		        circs.attr("cx", node.cx)
					.attr("cy", node.cy);
		    };

		    map.on("zoomend", zoomend);

		    $('#loading').hide();

		}); // end .get data 
	}
	return this
})(jQuery);