/*
 * Class SVGMap
 * 
 * @elementId - the html DOM id
 * 
 * 
 * Requires project.js, heatmap.js
 */

var SVGMap = function(elementId, mapConf) { 
	
	var vBoxWidth = 1200, 
		vBoxHeight = 900,
		bgWidth = 900,
		bgHeight = 1500,
		overlayID = "telemetry",
		tooltip = new CustomTooltip(elementId + "-tooltip"),
		clicked;
	
	// Initialise the map
	loadSvg();
	
	function loadSvg() {
		//block();
		$.ajax({
			url: mapConf.svgFile,
			type: "GET",
			data: {},
			dataType: "xml",
			async: false,
				
			success: function(xml, textStatus, jqXHR) {
				var importedNode;
				try {
					 importedNode = document.importNode(xml.documentElement, true);
				}
				catch(e) {
					 // IE case
				     importedNode = ieImportNode(xml.documentElement, document);
				}
					
				$("#" + elementId).append(importedNode);
			},
			error: function (xhr, ajaxOptions, thrownError){
				console.error(this.url + "\n" + ajaxOptions + " " + xhr.status + " " + thrownError );
			},
			complete: function() {
				var svg = d3.select("#" + elementId + " svg")
					.attr("width", $("#" + elementId).width())
					.attr("height", $("#" + elementId).height())
					.attr("enable-background", "new 0 0 " + bgWidth + " " + bgHeight)
					.call(svg_interact);
				
				drawGrid();
			}
		});
		//unBlock();
	}
	
	function drawGrid() {
		var gridStep = 500/mapConf.scale; // The step of the grid in map coordinates
			
		var grid = d3.select("#" + elementId + " svg")
			.append("svg:g")
			.attr("id", "grid");

		var xAxisDataNeg = d3.range(convert2WebXCoord(0), 0, -gridStep);
		var xAxisDataPos = d3.range(convert2WebXCoord(0), bgWidth, gridStep);
		
		var yAxisDataNeg = d3.range(convert2WebYCoord(0), 0, -gridStep);
		var yAxisDataPos = d3.range(convert2WebYCoord(0), bgHeight, gridStep);
					 
		grid.selectAll("line.vertical")
			.data(xAxisDataNeg.concat(xAxisDataPos))
			.enter()
				.append("svg:line")
				.attr("x1", function(d) {return d;})
				.attr("y1", 0)
				.attr("x2", function(d) {return d;})
				.attr("y2", bgHeight)
				.attr("class", "map-grid");
			 
		grid.selectAll("line.horizontal")
			.data(yAxisDataNeg.concat(yAxisDataPos))
			.enter()
				.append("svg:line")
				.attr("x1", 0)
				.attr("y1", function(d) {return d;})
				.attr("x2", bgWidth)
				.attr("y2", function(d) {return d;})
				.attr("class", "map-grid");
	}
	
	function drawLayers(layersElementId) {
		$("#" + layersElementId)
			.append(
				$("<fieldset>")
					.attr("id", "map-layers")
					.append(
						$("<legend>").text("Map Layers")
					)
			)
		
		mapConf.layers.push(overlayID);
		
		$.each(mapConf.layers, function(i, layer) {
			$("#map-layers")
				.append(
					$("<input>")
						.attr("type", "checkbox")
						.attr("id", "map-layer-" + layer)
						.attr("checked", true)
						.val(layer)
				)
				.append(
					$("<label>")
						.attr("for", "map-layer-" + layer)
						.text(capitaliseString(layer))
				)
				.append($("<br />"));
		});
		
		$("#map-layers input[type=checkbox]").click(function() {
			var layer = d3.select("#" + elementId + " svg").select("g#" + $(this).val());
		   		
			if ($(this).is(":checked")) {
				layer
				.transition()
		   			.attr("opacity", 1);
		   	}
		   	else {
		   		layer
		   		.transition()
		   			.attr("opacity", 0.01);
		   	}
		});
		
	}
	
	function show() {
		$("#" + elementId)
			.removeClass("hidden");
	}
	
	function hide() {
		$("#" + elementId)
			.addClass("hidden");
	}
	
	function removeOverlay() {
		d3.select("#" + elementId + " svg")
			.selectAll("g#" + overlayID)
	  			.transition()
	   				.attr("opacity", 0.01)
	   			.remove();
	}
	
	function drawCircles(dataObjects, dataFunctions) {
		var minPercent = 2,
			maxPercent = 12;
		
		var circles = d3.select("#" + elementId + " svg")
			.append("svg:g")
				.attr("id", overlayID);
	
		var valuesSum = d3.sum(dataObjects, function(d) {
			return dataFunctions.getValue(d);
		});
			
		circles
			.selectAll("circle")
			.data(dataObjects)
			.enter()
				.append("svg:circle")
				.attr("id", function(d, i) {return "circle_" + i;})
				.attr("cx", function(d) {
					return convert2WebXCoord(dataFunctions.getX(d));
				})
				.attr("cy", function(d) {
					return convert2WebYCoord(dataFunctions.getY(d));
				})
				.attr("r", function(d, i) {
					var radius = 50/mapConf.scale;
					if (dataFunctions.getValue(d)) {
						radius = (dataFunctions.getValue(d)/valuesSum) * 100;
					
						radius = (radius < minPercent) ? minPercent : radius;
						radius = (radius > maxPercent) ? maxPercent : radius;
					}
					
					return radius;
				})
				.attr("fill", function(d) {return dataFunctions.getColour(d)})
				.attr("stroke", "rgba(0, 0, 0, 0.5)")
				.attr("stroke-width", 0.2)
				.attr("opacity", 0.85)
				.on("mouseover", function(d, i) {
					tooltip.showTooltip(dataFunctions.getTooltipContent(d), d3.event);
				})
				.on("mouseout", function(d, i) {
					tooltip.hideTooltip();
				});
				/*
				.append("title")
				.text(function(d, i) {
					var title = ""
						+ "Name: " + dataFunctions.getName(d)
						+ ", \nLocation: (x=" + dataFunctions.getX(d)
						+ ", y=" 
						+ dataFunctions.getY(d)
						+ ")";
												
					return title;
					
				});
				*/
		
	}
	
	function drawHeatmap(dataObjects, dataFunctions) {

		var min = 0, max = 0;
		$.each(dataObjects, function(i, d) {
			min = ((dataFunctions.getValue(d) < min) ? dataFunctions.getValue(d) : min);
			max = ((dataFunctions.getValue(d) > max) ? dataFunctions.getValue(d) : max);
		});
		var med = ((min+max)/2);
		
		//var thresholdSlider = $("#" + domElement + " div.threshold-slider");
		//thresholdSlider.slider("option", "min", min);
		//thresholdSlider.slider("option", "max", max);
		//thresholdSlider.slider("refresh");
		
		//var valuesSlider = $("#" + domElement + " div.value-slider");
		//valuesSlider.slider("option", "min", min);
		//valuesSlider.slider("option", "max", max);
		//$("#" + domElement + " span.value-min").text(min.toFixed(2));
		//$("#" + domElement + " span.value-max").text(max.toFixed(2));
		
		//if ((valuesSlider.slider("values")[0] == min) && (valuesSlider.slider("values")[1] == min)) {
		//	valuesSlider.slider("values", 0, min);
		//	valuesSlider.slider("values", 1, max);
		//}
		//valuesSlider.slider("refresh");
		
		//rangeSliderValues = valuesSlider.slider("values");
		//var heatmapSliderValues = $("#" + domElement + " div.heatmap-slider-placeholder").slider("values");
		/*
		var colourInterpolator = getColourInterpolator(rangeSliderValues[0], rangeSliderValues[1],
														heatmapSliderValues[1], heatmapSliderValues[0]);
		*/	
		var colourInterpolator = getColourInterpolator(min, max, 0, 120);
		
		//$("#" + domElement + " span.heatmap-gradient" + " span.heatmap-min").text(rangeSliderValues[0].toFixed(2));
		//$("#" + domElement + " span.heatmap-gradient" + " span.heatmap-med").text(
		//		((rangeSliderValues[0] + rangeSliderValues[1]) / 2).toFixed(2)
		//);
		//$("#" + domElement + " span.heatmap-gradient" + " span.heatmap-max").text(rangeSliderValues[1].toFixed(2));
		
		
		var heatmap = d3.select("#" + elementId + " svg").append("svg:g")
						.attr("id", overlayID)
						//.attr("opacity", 0.01);	
		
		heatmap
			.selectAll("rect")
			.data(dataObjects)
			.enter()
				.append("svg:rect")
				.attr("x", function(d) {
					return convert2WebXCoord(dataFunctions.getX(d));
				})
				.attr("y", function(d) {
					return convert2WebYCoord(dataFunctions.getY(d) + dataFunctions.getResolution());
				})
				.attr("width", dataFunctions.getResolution()/project.map.scale)
				.attr("height", dataFunctions.getResolution()/project.map.scale)
				.attr("fill", function(d) {
					return colourInterpolator(dataFunctions.getValue(d));
				})
				//.attr("visibility", function(d) { // Hide if below the threshold limit
				//	return (valueFunc(d) >= thresholdSlider.slider("value")) ? "visible" : "hidden";
				//})
				.on("click", heatmapHighlight)
				.append("title")
					.text(dataFunctions.getTitle);

		heatmap
			.transition()
			.attr("opacity", 1);

		function heatmapHighlight(d) {
		
			if (d && clicked !== d) {
				clicked = d;
			}
			else {
				clicked = null;
			}

			heatmap.selectAll("rect")
	 			.classed("clicked", clicked && function(d) { return d === clicked; });
		}

	}
	// end of drawHeatmap
	
	function exportToImage() {
		var canvasId = "viewport-canvas";
		
		$("#" + canvasId).remove();
		
		$("#" + elementId)
			.append(
				$("<canvas>")
					.attr("id", canvasId)
					.addClass("hidden")
					.css("width", 1000)
					.css("height", 1000)
			);
				
		var svgMarkup = $("<div>").append(
				$("#" + elementId + " svg")
					.clone()
					.attr("width", 1000)
					.attr("height", 1000)
				)
				.html()
				//.replace(/xmlns=\"http:\/\/www\.w3\.org\/2000\/svg\"/, '') // IE fixes
				//.replace(/xmlns:NS1=\"\"/, '')
				//.replace(/xmlns:NS2=\"\"/, '')
				//.replace(/NS2:xml:space=\"preserve\"/, '')
				//.replace(/NS1:xmlns:xlink=\"http:\/\/www\.w3\.org\/1999\/xlink\"/, '');
		
		canvg(canvasId, svgMarkup);
		
		var canvas = document.getElementById(canvasId);
		var img = canvas.toDataURL("image/png");
		
		window.open(img);
	}
	
	function convert2WebXCoord(x) {
		return ((x + mapConf.coords.x)/mapConf.scale);
	}
	
	function convert2WebYCoord(y) {
		return (((-1)*y + mapConf.coords.y)/mapConf.scale);
	}
	
	function convert2WebCoords(p) {
		return [convert2WebXCoord(p[0]), convert2WebYCoord(p[1])];
	}
	
	/* Copied from ie-hacks.js */
	function ieImportNode(node, allChildren) {
		// Manually imports node to the provided document
		switch (node.nodeType) {
			case document.ELEMENT_NODE:
				var newNode = document.createElementNS(node.namespaceURI, node.nodeName);
			    if(node.attributes && node.attributes.length > 0) {
			    	for(var i = 0, il = node.attributes.length; i < il; i++) {
			    		newNode.setAttribute(node.attributes[i].nodeName, node.getAttribute(node.attributes[i].nodeName));
			    	}
			    }
			    if(allChildren && node.childNodes && node.childNodes.length > 0) {
			    	for(var i = 0, il = node.childNodes.length; i < il; i++){
			    		newNode.appendChild(ieImportNode(node.childNodes[i], allChildren));
			    	}
			    }
			            
			    return newNode;
			    break;
			            
			case document.TEXT_NODE:
				
			case document.CDATA_SECTION_NODE:
				
			case document.COMMENT_NODE:
				return document.createTextNode(node.nodeValue);
				break;
		}
	}
	
	/* Copied from svg_interact.js */
	function svg_interact(svg,p) {
	    return new svg_interactObj(svg,p);
	}

	function svg_interactObj(svg,p) {  
	    var p = p ? p : {},
	        zoom_speed = p.zoom_speed ? p.zoom_speed : 1.15,
	        viewBox = svg[0][0].viewBox.baseVal;
	        panning = null, 
	        current_mouse = null;
	        
	    /* Panning moves the viewbox */

	    function mousemove(){
	    	//console.log(current_mouse);
	    	if (d3.mouse)
	    		current_mouse = d3.mouse(this);
	    	else
	    		current_mouse = d3.svg.mouse(this);
	        if (panning)  {
	            viewBox.x += (panning[0] - current_mouse[0]);
	            viewBox.y += (panning[1] - current_mouse[1]);
	            
	            updateViewBoxAttr(viewBox);
	        }
	    };
	    
	    function mousedown() {
	    	if (d3.mouse)
	    		panning = d3.mouse(this);
	    	else
	    		panning = d3.svg.mouse(this);
	    }
	    
	    /* Zoom with mousewheel - keeping mouse position in same location*/

	    function wheel(event) {
	    	var delta = 0;

	    	if (event.wheelDelta) {
	    		delta = event.wheelDelta/120; 
	    	} 
	        else if (event.detail) {
	        	delta = -event.detail/3;
	        }
	        move = (delta<0) ? -delta * zoom_speed : 1/(delta*zoom_speed);
	        	
	        viewBox.x = (current_mouse[0] - (current_mouse[0]-viewBox.x) * move);
	        viewBox.y = (current_mouse[1] - (current_mouse[1]-viewBox.y) * move); 
	        viewBox.height = viewBox.height * move;
	        viewBox.width = viewBox.width * move;
	        
	        updateViewBoxAttr(viewBox);
	    };
	    
	    // Webkit fix - otherwise the viewbox is't always picking up the changes and zoom/pan fails
	    function updateViewBoxAttr(viewBox) {
	    	svg[0][0].setAttribute("viewBox", viewBox.x + " " + viewBox.y + " " + viewBox.width + " " + viewBox.height);
	    }
	    
	    if (navigator.userAgent.toLowerCase().indexOf("firefox") > -1)
	    	svg[0][0].addEventListener("DOMMouseScroll", wheel, false);
	    else
	    	svg[0][0].addEventListener("mousewheel", wheel, false);
	    svg[0][0].onmousewheel = wheel;
	    svg.onmousewheel = wheel;
	    
	    svg.on("mousemove", mousemove);
	    svg.on("mousedown", mousedown);
	    
	    d3.select(window).on("mouseup", function () { panning = null;})
	    svg[0][0].ondragstart = function() { return false }  // Firefox fix

	    return svg;
	}
	
	function getColourInterpolator(minVal, maxVal, minHue, maxHue) {
		// copying Michael Taschler's code of interpolation 
		
		return function (val) {
			// Give the values outside the limits the limit colours
			if (val < minVal)
				val = minVal;
			else if (val > maxVal)
				val = maxVal;
			
			// 0.0 to 1.0 scale convertion
			val -= minVal;
			if ((maxVal - minVal) != 0) // avoid division by zero
				val /= (maxVal - minVal);
			else
				val = 0;
		
			var lowHue = minHue / 360.0;
			var highHue = maxHue / 360.0;
			var diffHue = highHue - lowHue;
		
			var h = (lowHue + (val * diffHue)) * 360;
			var s = 0.9;
			var v = 0.9;
		
			return hsv2hsl(h, s, v);
		}
	}
	
	function hsv2hsl(h, s, v) {
		// Hue stays the same
		// Saturation is very different between the two color spaces
		// If (2-s)*v < 1 set it to s*v/((2-s)*v)
		// Otherwise s*v/(2-(2-s)*v)
		// Conditional is not operating with hue, it is reassigned!
		s = (s * v) / ((((2-s) * v) < 1) ? ((2-s) * v) : 2-((2-s) * v));
		l = (2-s)*v/2; // Lightness is (2-s)*v/2
		
		return d3.hsl(h, s, l).toString();
	}
	
	return {
		removeOverlay: removeOverlay,
        drawCircles: drawCircles,
        drawHeatmap: drawHeatmap,
        drawLayers: drawLayers,
        show: show,
        hide: hide,
        exportToImage: exportToImage,
    };
	
}