/*!
 * d3pie
 * @author Ben Keen
 * @version 0.1.8
 * @date May 1st, 2015
 * @repo http://github.com/benkeen/d3pie
 */

// UMD pattern from https://github.com/umdjs/umd/blob/master/returnExports.js
(function(root, factory) {
  if (typeof define === 'function' && define.amd) {
    // AMD. Register as an anonymous module
    define([], factory);
  } else if (typeof exports === 'object') {
    // Node. Does not work with strict CommonJS, but only CommonJS-like environments that support module.exports,
    // like Node
    module.exports = factory(require());
  } else {
    // browser globals (root is window)
    root.d3pie = factory(root);
  }
}(this, function() {

	var _scriptName = "d3pie";
	var _version = "0.1.6";

	// used to uniquely generate IDs and classes, ensuring no conflict between multiple pies on the same page
	var _uniqueIDCounter = 0;


	// this section includes all helper libs on the d3pie object. They're populated via grunt-template. Note: to keep
	// the syntax highlighting from getting all messed up, I commented out each line. That REQUIRES each of the files
	// to have an empty first line. Crumby, yes, but acceptable.
	//// --------- _default-settings.js -----------/**
/**
 * Contains the out-the-box settings for the script. Any of these settings that aren't explicitly overridden for the
 * d3pie instance will inherit from these. This is also included on the main website for use in the generation script.
 */
var defaultSettings = {
	header: {
		title: {
			text:     "",
			color:    "#333333",
			fontSize: 18,
			font:     "arial"
		},
		subtitle: {
			text:     "",
			color:    "#666666",
			fontSize: 14,
			font:     "arial"
		},
		location: "top-center",
		titleSubtitlePadding: 8
	},
	footer: {
		text: 	  "",
		color:    "#666666",
		fontSize: 14,
		font:     "arial",
		location: "left"
	},
	size: {
		canvasHeight: 500,
		canvasWidth: 500,
		pieInnerRadius: "0%",
		pieOuterRadius: null
	},
	data: {
		sortOrder: "none",
		ignoreSmallSegments: {
			enabled: false,
			valueType: "percentage",
			value: null
		},
		smallSegmentGrouping: {
			enabled: false,
			value: 1,
			valueType: "percentage",
			label: "Other",
			color: "#cccccc"
		},
		content: []
	},
	labels: {
		outer: {
			format: "label",
			hideWhenLessThanPercentage: null,
			pieDistance: 30
		},
		inner: {
			format: "percentage",
			hideWhenLessThanPercentage: null
		},
		mainLabel: {
			color: "#333333",
			font: "arial",
			fontSize: 10
		},
		percentage: {
			color: "#dddddd",
			font: "arial",
			fontSize: 10,
			decimalPlaces: 0
		},
		value: {
			color: "#cccc44",
			font: "arial",
			fontSize: 10
		},
		lines: {
			enabled: true,
			style: "curved",
			color: "segment"
		},
		truncation: {
			enabled: false,
			truncateLength: 30
		},
    formatter: null
	},
	effects: {
		load: {
			effect: "default",
			speed: 1000
		},
		pullOutSegmentOnClick: {
			effect: "bounce",
			speed: 300,
			size: 10
		},
		highlightSegmentOnMouseover: true,
		highlightLuminosity: -0.2
	},
	tooltips: {
		enabled: false,
		type: "placeholder", // caption|placeholder
    string: "",
    placeholderParser: null,
		styles: {
      fadeInSpeed: 250,
			backgroundColor: "#000000",
      backgroundOpacity: 0.5,
			color: "#efefef",
      borderRadius: 2,
      font: "arial",
      fontSize: 10,
      padding: 4
		}
	},
	misc: {
		colors: {
			background: null,
			segments: [
				"#2484c1", "#65a620", "#7b6888", "#a05d56", "#961a1a", "#d8d23a", "#e98125", "#d0743c", "#635222", "#6ada6a",
				"#0c6197", "#7d9058", "#207f33", "#44b9b0", "#bca44a", "#e4a14b", "#a3acb2", "#8cc3e9", "#69a6f9", "#5b388f",
				"#546e91", "#8bde95", "#d2ab58", "#273c71", "#98bf6e", "#4daa4b", "#98abc5", "#cc1010", "#31383b", "#006391",
				"#c2643f", "#b0a474", "#a5a39c", "#a9c2bc", "#22af8c", "#7fcecf", "#987ac6", "#3d3b87", "#b77b1c", "#c9c2b6",
				"#807ece", "#8db27c", "#be66a2", "#9ed3c6", "#00644b", "#005064", "#77979f", "#77e079", "#9c73ab", "#1f79a7"
			],
			segmentStroke: "#ffffff"
		},
		gradient: {
			enabled: false,
			percentage: 95,
			color: "#000000"
		},
		canvasPadding: {
			top: 5,
			right: 5,
			bottom: 5,
			left: 5
		},
		pieCenterOffset: {
			x: 0,
			y: 0
		},
		cssPrefix: null
	},
	callbacks: {
		onload: null,
		onMouseoverSegment: null,
		onMouseoutSegment: null,
		onClickSegment: null
	}
};

	//// --------- validate.js -----------
var validate = {

	// called whenever a new pie chart is created
	initialCheck: function(pie) {
		var cssPrefix = pie.cssPrefix;
		var element = pie.element;
		var options = pie.options;

		// confirm d3 is available [check minimum version]
		if (!window.d3 || !window.d3.hasOwnProperty("version")) {
			console.error("d3pie error: d3 is not available");
			return false;
		}

		// confirm element is either a DOM element or a valid string for a DOM element
		if (!(element instanceof HTMLElement || element instanceof SVGElement)) {
			console.error("d3pie error: the first d3pie() param must be a valid DOM element (not jQuery) or a ID string.");
			return false;
		}

		// confirm the CSS prefix is valid. It has to start with a-Z and contain nothing but a-Z0-9_-
		if (!(/[a-zA-Z][a-zA-Z0-9_-]*$/.test(cssPrefix))) {
			console.error("d3pie error: invalid options.misc.cssPrefix");
			return false;
		}

		// confirm some data has been supplied
		if (!helpers.isArray(options.data.content)) {
			console.error("d3pie error: invalid config structure: missing data.content property.");
			return false;
		}
		if (options.data.content.length === 0) {
			console.error("d3pie error: no data supplied.");
			return false;
		}

		// clear out any invalid data. Each data row needs a valid positive number and a label
		var data = [];
		for (var i=0; i<options.data.content.length; i++) {
			if (typeof options.data.content[i].value !== "number" || isNaN(options.data.content[i].value)) {
				console.log("not valid: ", options.data.content[i]);
				continue;
			}
			if (options.data.content[i].value <= 0) {
				console.log("not valid - should have positive value: ", options.data.content[i]);
				continue;
			}
			data.push(options.data.content[i]);
		}
		pie.options.data.content = data;

		// labels.outer.hideWhenLessThanPercentage - 1-100
		// labels.inner.hideWhenLessThanPercentage - 1-100

		return true;
	}
};

	//// --------- helpers.js -----------
var helpers = {

	// creates the SVG element
	addSVGSpace: function(pie) {
		var element = pie.element;
		var canvasWidth = pie.options.size.canvasWidth;
		var canvasHeight = pie.options.size.canvasHeight;
		var backgroundColor = pie.options.misc.colors.background;

		var svg = d3.select(element).append("svg:svg")
			.attr("width", canvasWidth)
			.attr("height", canvasHeight);

		if (backgroundColor !== "transparent") {
			svg.style("background-color", function() { return backgroundColor; });
		}

		return svg;
	},

	whenIdExists: function(id, callback) {
		var inc = 1;
		var giveupIterationCount = 1000;

		var interval = setInterval(function() {
			if (document.getElementById(id)) {
				clearInterval(interval);
				callback();
			}
			if (inc > giveupIterationCount) {
				clearInterval(interval);
			}
			inc++;
		}, 1);
	},

	whenElementsExist: function(els, callback) {
		var inc = 1;
		var giveupIterationCount = 1000;

		var interval = setInterval(function() {
			var allExist = true;
			for (var i=0; i<els.length; i++) {
				if (!document.getElementById(els[i])) {
					allExist = false;
					break;
				}
			}
			if (allExist) {
				clearInterval(interval);
				callback();
			}
			if (inc > giveupIterationCount) {
				clearInterval(interval);
			}
			inc++;
		}, 1);
	},

	shuffleArray: function(array) {
		var currentIndex = array.length, tmpVal, randomIndex;

		while (0 !== currentIndex) {
			randomIndex = Math.floor(Math.random() * currentIndex);
			currentIndex -= 1;

			// and swap it with the current element
			tmpVal = array[currentIndex];
			array[currentIndex] = array[randomIndex];
			array[randomIndex] = tmpVal;
		}
		return array;
	},

	processObj: function(obj, is, value) {
		if (typeof is === 'string') {
			return helpers.processObj(obj, is.split('.'), value);
		} else if (is.length === 1 && value !== undefined) {
            obj[is[0]] = value;
			return obj[is[0]];
		} else if (is.length === 0) {
			return obj;
		} else {
			return helpers.processObj(obj[is[0]], is.slice(1), value);
		}
	},

	getDimensions: function(id) {
		var el = document.getElementById(id);
		var w = 0, h = 0;
		if (el) {
			var dimensions = el.getBBox();
			w = dimensions.width;
			h = dimensions.height;
		} else {
			console.log("error: getDimensions() " + id + " not found.");
		}
		return { w: w, h: h };
	},

	/**
	 * This is based on the SVG coordinate system, where top-left is 0,0 and bottom right is n-n.
	 * @param r1
	 * @param r2
	 * @returns {boolean}
	 */
	rectIntersect: function(r1, r2) {
		var returnVal = (
			// r2.left > r1.right
			(r2.x > (r1.x + r1.w)) ||

			// r2.right < r1.left
			((r2.x + r2.w) < r1.x) ||

			// r2.top < r1.bottom
			((r2.y + r2.h) < r1.y) ||

			// r2.bottom > r1.top
			(r2.y > (r1.y + r1.h))
		);

		return !returnVal;
	},

	/**
	 * Returns a lighter/darker shade of a hex value, based on a luminance value passed.
	 * @param hex a hex color value such as “#abc” or “#123456″ (the hash is optional)
	 * @param lum the luminosity factor: -0.1 is 10% darker, 0.2 is 20% lighter, etc.
	 * @returns {string}
	 */
	getColorShade: function(hex, lum) {

		// validate hex string
		hex = String(hex).replace(/[^0-9a-f]/gi, '');
		if (hex.length < 6) {
			hex = hex[0]+hex[0]+hex[1]+hex[1]+hex[2]+hex[2];
		}
		lum = lum || 0;

		// convert to decimal and change luminosity
		var newHex = "#";
		for (var i=0; i<3; i++) {
			var c = parseInt(hex.substr(i * 2, 2), 16);
			c = Math.round(Math.min(Math.max(0, c + (c * lum)), 255)).toString(16);
			newHex += ("00" + c).substr(c.length);
		}

		return newHex;
	},

	/**
	 * Users can choose to specify segment colors in three ways (in order of precedence):
	 * 	1. include a "color" attribute for each row in data.content
	 * 	2. include a misc.colors.segments property which contains an array of hex codes
	 * 	3. specify nothing at all and rely on this lib provide some reasonable defaults
	 *
	 * This function sees what's included and populates this.options.colors with whatever's required
	 * for this pie chart.
	 * @param data
	 */
	initSegmentColors: function(pie) {
		var data   = pie.options.data.content;
		var colors = pie.options.misc.colors.segments;

		// TODO this needs a ton of error handling

		var finalColors = [];
		for (var i=0; i<data.length; i++) {
			if (data[i].hasOwnProperty("color")) {
				finalColors.push(data[i].color);
			} else {
				finalColors.push(colors[i]);
			}
		}

		return finalColors;
	},

	applySmallSegmentGrouping: function(data, smallSegmentGrouping) {
		var totalSize;
		if (smallSegmentGrouping.valueType === "percentage") {
			totalSize = math.getTotalPieSize(data);
		}

		// loop through each data item
		var newData = [];
		var groupedData = [];
		var totalGroupedData = 0;
		for (var i=0; i<data.length; i++) {
			if (smallSegmentGrouping.valueType === "percentage") {
				var dataPercent = (data[i].value / totalSize) * 100;
				if (dataPercent <= smallSegmentGrouping.value) {
					groupedData.push(data[i]);
					totalGroupedData += data[i].value;
					continue;
				}
				data[i].isGrouped = false;
				newData.push(data[i]);
			} else {
				if (data[i].value <= smallSegmentGrouping.value) {
					groupedData.push(data[i]);
					totalGroupedData += data[i].value;
					continue;
				}
				data[i].isGrouped = false;
				newData.push(data[i]);
			}
		}

		// we're done! See if there's any small segment groups to add
		if (groupedData.length) {
			newData.push({
				color: smallSegmentGrouping.color,
				label: smallSegmentGrouping.label,
				value: totalGroupedData,
				isGrouped: true,
				groupedData: groupedData
			});
		}

		return newData;
	},

	// for debugging
	showPoint: function(svg, x, y) {
		svg.append("circle").attr("cx", x).attr("cy", y).attr("r", 2).style("fill", "black");
	},

	isFunction: function(functionToCheck) {
		var getType = {};
		return functionToCheck && getType.toString.call(functionToCheck) === '[object Function]';
	},

	isArray: function(o) {
		return Object.prototype.toString.call(o) === '[object Array]';
	}
};


// taken from jQuery
var extend = function() {
	var options, name, src, copy, copyIsArray, clone, target = arguments[0] || {},
		i = 1,
		length = arguments.length,
		deep = false,
		toString = Object.prototype.toString,
		hasOwn = Object.prototype.hasOwnProperty,
		class2type = {
			"[object Boolean]": "boolean",
			"[object Number]": "number",
			"[object String]": "string",
			"[object Function]": "function",
			"[object Array]": "array",
			"[object Date]": "date",
			"[object RegExp]": "regexp",
			"[object Object]": "object"
		},

		jQuery = {
			isFunction: function (obj) {
				return jQuery.type(obj) === "function";
			},
			isArray: Array.isArray ||
				function (obj) {
					return jQuery.type(obj) === "array";
				},
			isWindow: function (obj) {
				return obj !== null && obj === obj.window;
			},
			isNumeric: function (obj) {
				return !isNaN(parseFloat(obj)) && isFinite(obj);
			},
			type: function (obj) {
				return obj === null ? String(obj) : class2type[toString.call(obj)] || "object";
			},
			isPlainObject: function (obj) {
				if (!obj || jQuery.type(obj) !== "object" || obj.nodeType) {
					return false;
				}
				try {
					if (obj.constructor && !hasOwn.call(obj, "constructor") && !hasOwn.call(obj.constructor.prototype, "isPrototypeOf")) {
						return false;
					}
				} catch (e) {
					return false;
				}
				var key;
				for (key in obj) {}
				return key === undefined || hasOwn.call(obj, key);
			}
		};
	if (typeof target === "boolean") {
		deep = target;
		target = arguments[1] || {};
		i = 2;
	}
	if (typeof target !== "object" && !jQuery.isFunction(target)) {
		target = {};
	}
	if (length === i) {
		target = this;
		--i;
	}
	for (i; i < length; i++) {
		if ((options = arguments[i]) !== null) {
			for (name in options) {
				src = target[name];
				copy = options[name];
				if (target === copy) {
					continue;
				}
				if (deep && copy && (jQuery.isPlainObject(copy) || (copyIsArray = jQuery.isArray(copy)))) {
					if (copyIsArray) {
						copyIsArray = false;
						clone = src && jQuery.isArray(src) ? src : [];
					} else {
						clone = src && jQuery.isPlainObject(src) ? src : {};
					}
					// WARNING: RECURSION
					target[name] = extend(deep, clone, copy);
				} else if (copy !== undefined) {
					target[name] = copy;
				}
			}
		}
	}
	return target;
};
	//// --------- math.js -----------
var math = {

	toRadians: function(degrees) {
		return degrees * (Math.PI / 180);
	},

	toDegrees: function(radians) {
		return radians * (180 / Math.PI);
	},

	computePieRadius: function(pie) {
		var size = pie.options.size;
		var canvasPadding = pie.options.misc.canvasPadding;

		// outer radius is either specified (e.g. through the generator), or omitted altogether
		// and calculated based on the canvas dimensions. Right now the estimated version isn't great - it should
		// be possible to calculate it to precisely generate the maximum sized pie, but it's fussy as heck. Something
		// for the next release.

		// first, calculate the default _outerRadius
		var w = size.canvasWidth - canvasPadding.left - canvasPadding.right;
		var h = size.canvasHeight - canvasPadding.top - canvasPadding.bottom;

		// now factor in the footer, title & subtitle
    if (pie.options.header.location !== "pie-center") {
      h -= pie.textComponents.headerHeight;
    }

    if (pie.textComponents.footer.exists) {
      h -= pie.textComponents.footer.h;
    }

		// for really teeny pies, h may be < 0. Adjust it back
		h = (h < 0) ? 0 : h;

		var outerRadius = ((w < h) ? w : h) / 3;
		var innerRadius, percent;

		// if the user specified something, use that instead
		if (size.pieOuterRadius !== null) {
			if (/%/.test(size.pieOuterRadius)) {
				percent = parseInt(size.pieOuterRadius.replace(/[\D]/, ""), 10);
				percent = (percent > 99) ? 99 : percent;
				percent = (percent < 0) ? 0 : percent;

				var smallestDimension = (w < h) ? w : h;

				// now factor in the label line size
				if (pie.options.labels.outer.format !== "none") {
					var pieDistanceSpace = parseInt(pie.options.labels.outer.pieDistance, 10) * 2;
					if (smallestDimension - pieDistanceSpace > 0) {
						smallestDimension -= pieDistanceSpace;
					}
				}

				outerRadius = Math.floor((smallestDimension / 100) * percent) / 2;
			} else {
				outerRadius = parseInt(size.pieOuterRadius, 10);
			}
		}

		// inner radius
		if (/%/.test(size.pieInnerRadius)) {
			percent = parseInt(size.pieInnerRadius.replace(/[\D]/, ""), 10);
			percent = (percent > 99) ? 99 : percent;
			percent = (percent < 0) ? 0 : percent;
			innerRadius = Math.floor((outerRadius / 100) * percent);
		} else {
			innerRadius = parseInt(size.pieInnerRadius, 10);
		}

		pie.innerRadius = innerRadius;
		pie.outerRadius = outerRadius;
	},

	getTotalPieSize: function(data) {
		var totalSize = 0;
		for (var i=0; i<data.length; i++) {
			totalSize += data[i].value;
		}
		return totalSize;
	},

	sortPieData: function(pie) {
		var data                 = pie.options.data.content;
		var sortOrder            = pie.options.data.sortOrder;

		switch (sortOrder) {
			case "none":
				// do nothing
				break;
			case "random":
				data = helpers.shuffleArray(data);
				break;
			case "value-asc":
				data.sort(function(a, b) { return (a.value < b.value) ? -1 : 1; });
				break;
			case "value-desc":
				data.sort(function(a, b) { return (a.value < b.value) ? 1 : -1; });
				break;
			case "label-asc":
				data.sort(function(a, b) { return (a.label.toLowerCase() > b.label.toLowerCase()) ? 1 : -1; });
				break;
			case "label-desc":
				data.sort(function(a, b) { return (a.label.toLowerCase() < b.label.toLowerCase()) ? 1 : -1; });
				break;
		}

		return data;
	},

	

	// var pieCenter = math.getPieCenter();
	getPieTranslateCenter: function(pieCenter) {
		return "translate(" + pieCenter.x + "," + pieCenter.y + ")";
	},

	/**
	 * Used to determine where on the canvas the center of the pie chart should be. It takes into account the
	 * height and position of the title, subtitle and footer, and the various paddings.
	 * @private
	 */
	calculatePieCenter: function(pie) {
		var pieCenterOffset = pie.options.misc.pieCenterOffset;
		var hasTopTitle    = (pie.textComponents.title.exists && pie.options.header.location !== "pie-center");
		var hasTopSubtitle = (pie.textComponents.subtitle.exists && pie.options.header.location !== "pie-center");

		var headerOffset = pie.options.misc.canvasPadding.top;
		if (hasTopTitle && hasTopSubtitle) {
			headerOffset += pie.textComponents.title.h + pie.options.header.titleSubtitlePadding + pie.textComponents.subtitle.h;
		} else if (hasTopTitle) {
			headerOffset += pie.textComponents.title.h;
		} else if (hasTopSubtitle) {
			headerOffset += pie.textComponents.subtitle.h;
		}

		var footerOffset = 0;
		if (pie.textComponents.footer.exists) {
			footerOffset = pie.textComponents.footer.h + pie.options.misc.canvasPadding.bottom;
		}

		var x = ((pie.options.size.canvasWidth - pie.options.misc.canvasPadding.left - pie.options.misc.canvasPadding.right) / 2) + pie.options.misc.canvasPadding.left;
		var y = ((pie.options.size.canvasHeight - footerOffset - headerOffset) / 2) + headerOffset;

		x += pieCenterOffset.x;
		y += pieCenterOffset.y;

		pie.pieCenter = { x: x, y: y };
	},


	/**
	 * Rotates a point (x, y) around an axis (xm, ym) by degrees (a).
	 * @param x
	 * @param y
	 * @param xm
	 * @param ym
	 * @param a angle in degrees
	 * @returns {Array}
	 */
	rotate: function(x, y, xm, ym, a) {

        a = a * Math.PI / 180; // convert to radians

        var cos = Math.cos,
			sin = Math.sin,
		// subtract midpoints, so that midpoint is translated to origin and add it in the end again
		xr = (x - xm) * cos(a) - (y - ym) * sin(a) + xm,
		yr = (x - xm) * sin(a) + (y - ym) * cos(a) + ym;

		return { x: xr, y: yr };
	},

	/**
	 * Translates a point x, y by distance d, and by angle a.
	 * @param x
	 * @param y
	 * @param dist
	 * @param a angle in degrees
	 */
	translate: function(x, y, d, a) {
		var rads = math.toRadians(a);
		return {
			x: x + d * Math.sin(rads),
			y: y - d * Math.cos(rads)
		};
	},

	// from: http://stackoverflow.com/questions/19792552/d3-put-arc-labels-in-a-pie-chart-if-there-is-enough-space
	pointIsInArc: function(pt, ptData, d3Arc) {
		// Center of the arc is assumed to be 0,0
		// (pt.x, pt.y) are assumed to be relative to the center
		var r1 = d3Arc.innerRadius()(ptData), // Note: Using the innerRadius
			r2 = d3Arc.outerRadius()(ptData),
			theta1 = d3Arc.startAngle()(ptData),
			theta2 = d3Arc.endAngle()(ptData);

		var dist = pt.x * pt.x + pt.y * pt.y,
			angle = Math.atan2(pt.x, -pt.y); // Note: different coordinate system

		angle = (angle < 0) ? (angle + Math.PI * 2) : angle;

		return (r1 * r1 <= dist) && (dist <= r2 * r2) &&
			(theta1 <= angle) && (angle <= theta2);
	}
};

	//// --------- labels.js -----------
var labels = {

	/**
	 * Adds the labels to the pie chart, but doesn't position them. There are two locations for the
	 * labels: inside (center) of the segments, or outside the segments on the edge.
	 * @param section "inner" or "outer"
	 * @param sectionDisplayType "percentage", "value", "label", "label-value1", etc.
	 * @param pie
	 */
	add: function(pie, section, sectionDisplayType) {
		var include = labels.getIncludes(sectionDisplayType);
		var settings = pie.options.labels;

		// group the label groups (label, percentage, value) into a single element for simpler positioning
		var outerLabel = pie.svg.insert("g", "." + pie.cssPrefix + "labels-" + section)
			.attr("class", pie.cssPrefix + "labels-" + section);

		var labelGroup = outerLabel.selectAll("." + pie.cssPrefix + "labelGroup-" + section)
			.data(pie.options.data.content)
			.enter()
			.append("g")
			.attr("id", function(d, i) { return pie.cssPrefix + "labelGroup" + i + "-" + section; })
			.attr("data-index", function(d, i) { return i; })
			.attr("class", pie.cssPrefix + "labelGroup-" + section)
			.style("opacity", 0);

    var formatterContext = { section: section, sectionDisplayType: sectionDisplayType };

		// 1. Add the main label
		if (include.mainLabel) {
			labelGroup.append("text")
				.attr("id", function(d, i) { return pie.cssPrefix + "segmentMainLabel" + i + "-" + section; })
				.attr("class", pie.cssPrefix + "segmentMainLabel-" + section)
				.text(function(d, i) {
					var str = d.label;

          // if a custom formatter has been defined, pass it the raw label string - it can do whatever it wants with it.
          // we only apply truncation if it's not defined
					if (settings.formatter) {
            formatterContext.index = i;
            formatterContext.part = 'mainLabel';
            formatterContext.value = d.value;
            formatterContext.label = str;
            str = settings.formatter(formatterContext);
          } else if (settings.truncation.enabled && d.label.length > settings.truncation.truncateLength) {
            str = d.label.substring(0, settings.truncation.truncateLength) + "...";
          }
          return str;
				})
				.style("font-size", settings.mainLabel.fontSize + "px")
				.style("font-family", settings.mainLabel.font)
				.style("fill", settings.mainLabel.color);
		}

		// 2. Add the percentage label
		if (include.percentage) {
			labelGroup.append("text")
				.attr("id", function(d, i) { return pie.cssPrefix + "segmentPercentage" + i + "-" + section; })
				.attr("class", pie.cssPrefix + "segmentPercentage-" + section)
				.text(function(d, i) {
					var percentage = segments.getPercentage(pie, i, pie.options.labels.percentage.decimalPlaces);
          if (settings.formatter) {
            formatterContext.index = i;
            formatterContext.part = "percentage";
            formatterContext.value = d.value;
            formatterContext.label = percentage;
            percentage = settings.formatter(formatterContext);
          } else {
            percentage += "%";
          }
          return percentage;
				})
				.style("font-size", settings.percentage.fontSize + "px")
				.style("font-family", settings.percentage.font)
				.style("fill", settings.percentage.color);
		}

		// 3. Add the value label
		if (include.value) {
			labelGroup.append("text")
				.attr("id", function(d, i) { return pie.cssPrefix +  "segmentValue" + i + "-" + section; })
				.attr("class", pie.cssPrefix + "segmentValue-" + section)
				.text(function(d, i) {
          formatterContext.index = i;
          formatterContext.part = "value";
          formatterContext.value = d.value;
          formatterContext.label = d.value;
          return settings.formatter ? settings.formatter(formatterContext, d.value) : d.value;
        })
				.style("font-size", settings.value.fontSize + "px")
				.style("font-family", settings.value.font)
				.style("fill", settings.value.color);
		}
	},

	/**
	 * @param section "inner" / "outer"
	 */
	positionLabelElements: function(pie, section, sectionDisplayType) {
		labels["dimensions-" + section] = [];

		// get the latest widths, heights
		var labelGroups = d3.selectAll("." + pie.cssPrefix + "labelGroup-" + section);
		labelGroups.each(function(d, i) {
			var mainLabel  = d3.select(this).selectAll("." + pie.cssPrefix + "segmentMainLabel-" + section);
			var percentage = d3.select(this).selectAll("." + pie.cssPrefix + "segmentPercentage-" + section);
			var value      = d3.select(this).selectAll("." + pie.cssPrefix + "segmentValue-" + section);

			labels["dimensions-" + section].push({
				mainLabel:  (mainLabel.node() !== null) ? mainLabel.node().getBBox() : null,
				percentage: (percentage.node() !== null) ? percentage.node().getBBox() : null,
				value:      (value.node() !== null) ? value.node().getBBox() : null
			});
		});

		var singleLinePad = 5;
		var dims = labels["dimensions-" + section];
		switch (sectionDisplayType) {
			case "label-value1":
				d3.selectAll("." + pie.cssPrefix + "segmentValue-" + section)
					.attr("dx", function(d, i) { return dims[i].mainLabel.width + singleLinePad; });
				break;
			case "label-value2":
				d3.selectAll("." + pie.cssPrefix + "segmentValue-" + section)
					.attr("dy", function(d, i) { return dims[i].mainLabel.height; });
				break;
			case "label-percentage1":
				d3.selectAll("." + pie.cssPrefix + "segmentPercentage-" + section)
					.attr("dx", function(d, i) { return dims[i].mainLabel.width + singleLinePad; });
				break;
			case "label-percentage2":
				d3.selectAll("." + pie.cssPrefix + "segmentPercentage-" + section)
					.attr("dx", function(d, i) { return (dims[i].mainLabel.width / 2) - (dims[i].percentage.width / 2); })
					.attr("dy", function(d, i) { return dims[i].mainLabel.height; });
				break;
	 	}
	},

	computeLabelLinePositions: function(pie) {
		pie.lineCoordGroups = [];
		d3.selectAll("." + pie.cssPrefix + "labelGroup-outer")
			.each(function(d, i) { return labels.computeLinePosition(pie, i); });
	},

	computeLinePosition: function(pie, i) {
		var angle = segments.getSegmentAngle(i, pie.options.data.content, pie.totalSize, { midpoint: true });
		var originCoords = math.rotate(pie.pieCenter.x, pie.pieCenter.y - pie.outerRadius, pie.pieCenter.x, pie.pieCenter.y, angle);
		var heightOffset = pie.outerLabelGroupData[i].h / 5; // TODO check
		var labelXMargin = 6; // the x-distance of the label from the end of the line [TODO configurable]

		var quarter = Math.floor(angle / 90);
		var midPoint = 4;
		var x2, y2, x3, y3;

		// this resolves an issue when the
		if (quarter === 2 && angle === 180) {
			quarter = 1;
		}

		switch (quarter) {
			case 0:
				x2 = pie.outerLabelGroupData[i].x - labelXMargin - ((pie.outerLabelGroupData[i].x - labelXMargin - originCoords.x) / 2);
				y2 = pie.outerLabelGroupData[i].y + ((originCoords.y - pie.outerLabelGroupData[i].y) / midPoint);
				x3 = pie.outerLabelGroupData[i].x - labelXMargin;
				y3 = pie.outerLabelGroupData[i].y - heightOffset;
				break;
			case 1:
				x2 = originCoords.x + (pie.outerLabelGroupData[i].x - originCoords.x) / midPoint;
				y2 = originCoords.y + (pie.outerLabelGroupData[i].y - originCoords.y) / midPoint;
				x3 = pie.outerLabelGroupData[i].x - labelXMargin;
				y3 = pie.outerLabelGroupData[i].y - heightOffset;
				break;
			case 2:
				var startOfLabelX = pie.outerLabelGroupData[i].x + pie.outerLabelGroupData[i].w + labelXMargin;
				x2 = originCoords.x - (originCoords.x - startOfLabelX) / midPoint;
				y2 = originCoords.y + (pie.outerLabelGroupData[i].y - originCoords.y) / midPoint;
				x3 = pie.outerLabelGroupData[i].x + pie.outerLabelGroupData[i].w + labelXMargin;
				y3 = pie.outerLabelGroupData[i].y - heightOffset;
				break;
			case 3:
				var startOfLabel = pie.outerLabelGroupData[i].x + pie.outerLabelGroupData[i].w + labelXMargin;
				x2 = startOfLabel + ((originCoords.x - startOfLabel) / midPoint);
				y2 = pie.outerLabelGroupData[i].y + (originCoords.y - pie.outerLabelGroupData[i].y) / midPoint;
				x3 = pie.outerLabelGroupData[i].x + pie.outerLabelGroupData[i].w + labelXMargin;
				y3 = pie.outerLabelGroupData[i].y - heightOffset;
				break;
		}

		/*
		 * x1 / y1: the x/y coords of the start of the line, at the mid point of the segments arc on the pie circumference
		 * x2 / y2: if "curved" line style is being used, this is the midpoint of the line. Other
		 * x3 / y3: the end of the line; closest point to the label
		 */
		if (pie.options.labels.lines.style === "straight") {
			pie.lineCoordGroups[i] = [
				{ x: originCoords.x, y: originCoords.y },
				{ x: x3, y: y3 }
			];
		} else {
			pie.lineCoordGroups[i] = [
				{ x: originCoords.x, y: originCoords.y },
				{ x: x2, y: y2 },
				{ x: x3, y: y3 }
			];
		}
	},

	addLabelLines: function(pie) {
		var lineGroups = pie.svg.insert("g", "." + pie.cssPrefix + "pieChart") // meaning, BEFORE .pieChart
			.attr("class", pie.cssPrefix + "lineGroups")
			.style("opacity", 0);

		var lineGroup = lineGroups.selectAll("." + pie.cssPrefix + "lineGroup")
			.data(pie.lineCoordGroups)
			.enter()
			.append("g")
			.attr("class", pie.cssPrefix + "lineGroup");

		var lineFunction = d3.svg.line()
			.interpolate("basis")
			.x(function(d) { return d.x; })
			.y(function(d) { return d.y; });

		lineGroup.append("path")
			.attr("d", lineFunction)
			.attr("stroke", function(d, i) {
				return (pie.options.labels.lines.color === "segment") ? pie.options.colors[i] : pie.options.labels.lines.color;
			})
			.attr("stroke-width", 1)
			.attr("fill", "none")
			.style("opacity", function(d, i) {
				var percentage = pie.options.labels.outer.hideWhenLessThanPercentage;
				var segmentPercentage = segments.getPercentage(pie, i, pie.options.labels.percentage.decimalPlaces);
				var isHidden = (percentage !== null && segmentPercentage < percentage) || pie.options.data.content[i].label === "";
				return isHidden ? 0 : 1;
			});
	},

	positionLabelGroups: function(pie, section) {
    if (pie.options.labels[section].format === "none") {
      return;
    }

		d3.selectAll("." + pie.cssPrefix + "labelGroup-" + section)
			.style("opacity", 0)
			.attr("transform", function(d, i) {
				var x, y;
				if (section === "outer") {
					x = pie.outerLabelGroupData[i].x;
					y = pie.outerLabelGroupData[i].y;
				} else {
					var pieCenterCopy = extend(true, {}, pie.pieCenter);

					// now recompute the "center" based on the current _innerRadius
					if (pie.innerRadius > 0) {
						var angle = segments.getSegmentAngle(i, pie.options.data.content, pie.totalSize, { midpoint: true });
						var newCoords = math.translate(pie.pieCenter.x, pie.pieCenter.y, pie.innerRadius, angle);
						pieCenterCopy.x = newCoords.x;
						pieCenterCopy.y = newCoords.y;
					}

					var dims = helpers.getDimensions(pie.cssPrefix + "labelGroup" + i + "-inner");
					var xOffset = dims.w / 2;
					var yOffset = dims.h / 4; // confusing! Why 4? should be 2, but it doesn't look right

					x = pieCenterCopy.x + (pie.lineCoordGroups[i][0].x - pieCenterCopy.x) / 1.8;
					y = pieCenterCopy.y + (pie.lineCoordGroups[i][0].y - pieCenterCopy.y) / 1.8;

					x = x - xOffset;
					y = y + yOffset;
				}

				return "translate(" + x + "," + y + ")";
			});
	},


	fadeInLabelsAndLines: function(pie) {

		// fade in the labels when the load effect is complete - or immediately if there's no load effect
		var loadSpeed = (pie.options.effects.load.effect === "default") ? pie.options.effects.load.speed : 1;
		setTimeout(function() {
			var labelFadeInTime = (pie.options.effects.load.effect === "default") ? 400 : 1; // 400 is hardcoded for the present

			d3.selectAll("." + pie.cssPrefix + "labelGroup-outer")
				.transition()
				.duration(labelFadeInTime)
				.style("opacity", function(d, i) {
					var percentage = pie.options.labels.outer.hideWhenLessThanPercentage;
					var segmentPercentage = segments.getPercentage(pie, i, pie.options.labels.percentage.decimalPlaces);
					return (percentage !== null && segmentPercentage < percentage) ? 0 : 1;
				});

			d3.selectAll("." + pie.cssPrefix + "labelGroup-inner")
				.transition()
				.duration(labelFadeInTime)
				.style("opacity", function(d, i) {
					var percentage = pie.options.labels.inner.hideWhenLessThanPercentage;
					var segmentPercentage = segments.getPercentage(pie, i, pie.options.labels.percentage.decimalPlaces);
					return (percentage !== null && segmentPercentage < percentage) ? 0 : 1;
				});

			d3.selectAll("g." + pie.cssPrefix + "lineGroups")
				.transition()
				.duration(labelFadeInTime)
				.style("opacity", 1);

			// once everything's done loading, trigger the onload callback if defined
			if (helpers.isFunction(pie.options.callbacks.onload)) {
				setTimeout(function() {
					try {
						pie.options.callbacks.onload();
					} catch (e) { }
				}, labelFadeInTime);
			}
		}, loadSpeed);
	},

	getIncludes: function(val) {
		var addMainLabel  = false;
		var addValue      = false;
		var addPercentage = false;

		switch (val) {
			case "label":
				addMainLabel = true;
				break;
			case "value":
				addValue = true;
				break;
			case "percentage":
				addPercentage = true;
				break;
			case "label-value1":
			case "label-value2":
				addMainLabel = true;
				addValue = true;
				break;
			case "label-percentage1":
			case "label-percentage2":
				addMainLabel = true;
				addPercentage = true;
				break;
		}
		return {
			mainLabel: addMainLabel,
			value: addValue,
			percentage: addPercentage
		};
	},


	/**
	 * This does the heavy-lifting to compute the actual coordinates for the outer label groups. It does two things:
	 * 1. Make a first pass and position them in the ideal positions, based on the pie sizes
	 * 2. Do some basic collision avoidance.
	 */
	computeOuterLabelCoords: function(pie) {

		// 1. figure out the ideal positions for the outer labels
		pie.svg.selectAll("." + pie.cssPrefix + "labelGroup-outer")
			.each(function(d, i) {
				return labels.getIdealOuterLabelPositions(pie, i);
			});

		// 2. now adjust those positions to try to accommodate conflicts
		labels.resolveOuterLabelCollisions(pie);
	},

	/**
	 * This attempts to resolve label positioning collisions.
	 */
	resolveOuterLabelCollisions: function(pie) {
    if (pie.options.labels.outer.format === "none") {
      return;
    }

		var size = pie.options.data.content.length;
		labels.checkConflict(pie, 0, "clockwise", size);
		labels.checkConflict(pie, size-1, "anticlockwise", size);
	},

	checkConflict: function(pie, currIndex, direction, size) {
    var i, curr;

		if (size <= 1) {
			return;
		}

		var currIndexHemisphere = pie.outerLabelGroupData[currIndex].hs;
		if (direction === "clockwise" && currIndexHemisphere !== "right") {
			return;
		}
		if (direction === "anticlockwise" && currIndexHemisphere !== "left") {
			return;
		}
		var nextIndex = (direction === "clockwise") ? currIndex+1 : currIndex-1;

		// this is the current label group being looked at. We KNOW it's positioned properly (the first item
		// is always correct)
		var currLabelGroup = pie.outerLabelGroupData[currIndex];

		// this one we don't know about. That's the one we're going to look at and move if necessary
		var examinedLabelGroup = pie.outerLabelGroupData[nextIndex];

		var info = {
			labelHeights: pie.outerLabelGroupData[0].h,
			center: pie.pieCenter,
			lineLength: (pie.outerRadius + pie.options.labels.outer.pieDistance),
			heightChange: pie.outerLabelGroupData[0].h + 1 // 1 = padding
		};

		// loop through *ALL* label groups examined so far to check for conflicts. This is because when they're
		// very tightly fitted, a later label group may still appear high up on the page
		if (direction === "clockwise") {
      i = 0;
			for (; i<=currIndex; i++) {
				curr = pie.outerLabelGroupData[i];

				// if there's a conflict with this label group, shift the label to be AFTER the last known
				// one that's been properly placed
				if (helpers.rectIntersect(curr, examinedLabelGroup)) {
					labels.adjustLabelPos(pie, nextIndex, currLabelGroup, info);
					break;
				}
			}
		} else {
      i = size - 1;
			for (; i >= currIndex; i--) {
				curr = pie.outerLabelGroupData[i];

				// if there's a conflict with this label group, shift the label to be AFTER the last known
				// one that's been properly placed
				if (helpers.rectIntersect(curr, examinedLabelGroup)) {
					labels.adjustLabelPos(pie, nextIndex, currLabelGroup, info);
					break;
				}
			}
		}
		labels.checkConflict(pie, nextIndex, direction, size);
	},

	// does a little math to shift a label into a new position based on the last properly placed one
	adjustLabelPos: function(pie, nextIndex, lastCorrectlyPositionedLabel, info) {
		var xDiff, yDiff, newXPos, newYPos;
		newYPos = lastCorrectlyPositionedLabel.y + info.heightChange;
		yDiff = info.center.y - newYPos;

		if (Math.abs(info.lineLength) > Math.abs(yDiff)) {
			xDiff = Math.sqrt((info.lineLength * info.lineLength) - (yDiff * yDiff));
		} else {
			xDiff = Math.sqrt((yDiff * yDiff) - (info.lineLength * info.lineLength));
		}

		if (lastCorrectlyPositionedLabel.hs === "right") {
			newXPos = info.center.x + xDiff;
		} else {
			newXPos = info.center.x - xDiff - pie.outerLabelGroupData[nextIndex].w;
		}

		pie.outerLabelGroupData[nextIndex].x = newXPos;
		pie.outerLabelGroupData[nextIndex].y = newYPos;
	},

	/**
	 * @param i 0-N where N is the dataset size - 1.
	 */
	getIdealOuterLabelPositions: function(pie, i) {
    var labelGroupNode = d3.select("#" + pie.cssPrefix + "labelGroup" + i + "-outer").node();
    if (!labelGroupNode) {
      return;
    }
    var labelGroupDims = labelGroupNode.getBBox();
		var angle = segments.getSegmentAngle(i, pie.options.data.content, pie.totalSize, { midpoint: true });

		var originalX = pie.pieCenter.x;
		var originalY = pie.pieCenter.y - (pie.outerRadius + pie.options.labels.outer.pieDistance);
		var newCoords = math.rotate(originalX, originalY, pie.pieCenter.x, pie.pieCenter.y, angle);

		// if the label is on the left half of the pie, adjust the values
		var hemisphere = "right"; // hemisphere
		if (angle > 180) {
			newCoords.x -= (labelGroupDims.width + 8);
			hemisphere = "left";
		} else {
			newCoords.x += 8;
		}

		pie.outerLabelGroupData[i] = {
			x: newCoords.x,
			y: newCoords.y,
			w: labelGroupDims.width,
			h: labelGroupDims.height,
			hs: hemisphere
		};
	}
};

	//// --------- segments.js -----------
var segments = {

	/**
	 * Creates the pie chart segments and displays them according to the desired load effect.
	 * @private
	 */
	create: function(pie) {
		var pieCenter = pie.pieCenter;
		var colors = pie.options.colors;
		var loadEffects = pie.options.effects.load;
		var segmentStroke = pie.options.misc.colors.segmentStroke;

		// we insert the pie chart BEFORE the title, to ensure the title overlaps the pie
		var pieChartElement = pie.svg.insert("g", "#" + pie.cssPrefix + "title")
			.attr("transform", function() { return math.getPieTranslateCenter(pieCenter); })
			.attr("class", pie.cssPrefix + "pieChart");

		var arc = d3.svg.arc()
			.innerRadius(pie.innerRadius)
			.outerRadius(pie.outerRadius)
			.startAngle(0)
			.endAngle(function(d) {
				return (d.value / pie.totalSize) * 2 * Math.PI;
			});

		var g = pieChartElement.selectAll("." + pie.cssPrefix + "arc")
			.data(pie.options.data.content)
			.enter()
			.append("g")
			.attr("class", pie.cssPrefix + "arc");

		// if we're not fading in the pie, just set the load speed to 0
		var loadSpeed = loadEffects.speed;
		if (loadEffects.effect === "none") {
			loadSpeed = 0;
		}

		g.append("path")
			.attr("id", function(d, i) { return pie.cssPrefix + "segment" + i; })
			.attr("fill", function(d, i) {
				var color = colors[i];
				if (pie.options.misc.gradient.enabled) {
					color = "url(#" + pie.cssPrefix + "grad" + i + ")";
				}
				return color;
			})
			.style("stroke", segmentStroke)
			.style("stroke-width", 1)
			.transition()
			.ease("cubic-in-out")
			.duration(loadSpeed)
			.attr("data-index", function(d, i) { return i; })
			.attrTween("d", function(b) {
				var i = d3.interpolate({ value: 0 }, b);
				return function(t) {
					return pie.arc(i(t));
				};
			});

		pie.svg.selectAll("g." + pie.cssPrefix + "arc")
			.attr("transform",
			function(d, i) {
				var angle = 0;
				if (i > 0) {
					angle = segments.getSegmentAngle(i-1, pie.options.data.content, pie.totalSize);
				}
				return "rotate(" + angle + ")";
			}
		);
		pie.arc = arc;
	},

	addGradients: function(pie) {
		var grads = pie.svg.append("defs")
			.selectAll("radialGradient")
			.data(pie.options.data.content)
			.enter().append("radialGradient")
			.attr("gradientUnits", "userSpaceOnUse")
			.attr("cx", 0)
			.attr("cy", 0)
			.attr("r", "120%")
			.attr("id", function(d, i) { return pie.cssPrefix + "grad" + i; });

		grads.append("stop").attr("offset", "0%").style("stop-color", function(d, i) { return pie.options.colors[i]; });
		grads.append("stop").attr("offset", pie.options.misc.gradient.percentage + "%").style("stop-color", pie.options.misc.gradient.color);
	},

	addSegmentEventHandlers: function(pie) {
		var arc = d3.selectAll("." + pie.cssPrefix + "arc,." + pie.cssPrefix + "labelGroup-inner,." + pie.cssPrefix + "labelGroup-outer");

		arc.on("click", function() {
			var currentEl = d3.select(this);
			var segment;

			// mouseover works on both the segments AND the segment labels, hence the following
			if (currentEl.attr("class") === pie.cssPrefix + "arc") {
				segment = currentEl.select("path");
			} else {
				var index = currentEl.attr("data-index");
				segment = d3.select("#" + pie.cssPrefix + "segment" + index);
			}
			var isExpanded = segment.attr("class") === pie.cssPrefix + "expanded";
			segments.onSegmentEvent(pie, pie.options.callbacks.onClickSegment, segment, isExpanded);
			if (pie.options.effects.pullOutSegmentOnClick.effect !== "none") {
				if (isExpanded) {
					segments.closeSegment(pie, segment.node());
				} else {
					segments.openSegment(pie, segment.node());
				}
			}
		});

		arc.on("mouseover", function() {
			var currentEl = d3.select(this);
			var segment, index;

			if (currentEl.attr("class") === pie.cssPrefix + "arc") {
				segment = currentEl.select("path");
			} else {
				index = currentEl.attr("data-index");
				segment = d3.select("#" + pie.cssPrefix + "segment" + index);
			}

			if (pie.options.effects.highlightSegmentOnMouseover) {
				index = segment.attr("data-index");
				var segColor = pie.options.colors[index];
				segment.style("fill", helpers.getColorShade(segColor, pie.options.effects.highlightLuminosity));
			}

      if (pie.options.tooltips.enabled) {
        index = segment.attr("data-index");
        tt.showTooltip(pie, index);
      }

			var isExpanded = segment.attr("class") === pie.cssPrefix + "expanded";
			segments.onSegmentEvent(pie, pie.options.callbacks.onMouseoverSegment, segment, isExpanded);
		});

    arc.on("mousemove", function() {
      tt.moveTooltip(pie);
    });

		arc.on("mouseout", function() {
			var currentEl = d3.select(this);
			var segment, index;

			if (currentEl.attr("class") === pie.cssPrefix + "arc") {
				segment = currentEl.select("path");
			} else {
				index = currentEl.attr("data-index");
				segment = d3.select("#" + pie.cssPrefix + "segment" + index);
			}

			if (pie.options.effects.highlightSegmentOnMouseover) {
				index = segment.attr("data-index");
				var color = pie.options.colors[index];
				if (pie.options.misc.gradient.enabled) {
					color = "url(#" + pie.cssPrefix + "grad" + index + ")";
				}
				segment.style("fill", color);
			}

      if (pie.options.tooltips.enabled) {
        index = segment.attr("data-index");
        tt.hideTooltip(pie, index);
      }

			var isExpanded = segment.attr("class") === pie.cssPrefix + "expanded";
			segments.onSegmentEvent(pie, pie.options.callbacks.onMouseoutSegment, segment, isExpanded);
		});
	},

	// helper function used to call the click, mouseover, mouseout segment callback functions
	onSegmentEvent: function(pie, func, segment, isExpanded) {
		if (!helpers.isFunction(func)) {
			return;
		}
		var index = parseInt(segment.attr("data-index"), 10);
		func({
			segment: segment.node(),
			index: index,
			expanded: isExpanded,
			data: pie.options.data.content[index]
		});
	},

	openSegment: function(pie, segment) {
		if (pie.isOpeningSegment) {
			return;
		}
		pie.isOpeningSegment = true;

		// close any open segments
		if (d3.selectAll("." + pie.cssPrefix + "expanded").length > 0) {
			segments.closeSegment(pie, d3.select("." + pie.cssPrefix + "expanded").node());
		}

		d3.select(segment).transition()
			.ease(pie.options.effects.pullOutSegmentOnClick.effect)
			.duration(pie.options.effects.pullOutSegmentOnClick.speed)
			.attr("transform", function(d, i) {
				var c = pie.arc.centroid(d),
					x = c[0],
					y = c[1],
					h = Math.sqrt(x*x + y*y),
					pullOutSize = parseInt(pie.options.effects.pullOutSegmentOnClick.size, 10);

				return "translate(" + ((x/h) * pullOutSize) + ',' + ((y/h) * pullOutSize) + ")";
			})
			.each("end", function(d, i) {
				pie.currentlyOpenSegment = segment;
				pie.isOpeningSegment = false;
				d3.select(this).attr("class", pie.cssPrefix + "expanded");
			});
	},

	closeSegment: function(pie, segment) {
		d3.select(segment).transition()
			.duration(400)
			.attr("transform", "translate(0,0)")
			.each("end", function(d, i) {
				d3.select(this).attr("class", "");
				pie.currentlyOpenSegment = null;
			});
	},

	getCentroid: function(el) {
		var bbox = el.getBBox();
		return {
			x: bbox.x + bbox.width / 2,
			y: bbox.y + bbox.height / 2
		};
	},

	/**
	 * General helper function to return a segment's angle, in various different ways.
	 * @param index
	 * @param opts optional object for fine-tuning exactly what you want.
	 */
	getSegmentAngle: function(index, data, totalSize, opts) {
		var options = extend({
			// if true, this returns the full angle from the origin. Otherwise it returns the single segment angle
			compounded: true,

			// optionally returns the midpoint of the angle instead of the full angle
			midpoint: false
		}, opts);

		var currValue = data[index].value;
		var fullValue;
		if (options.compounded) {
			fullValue = 0;

			// get all values up to and including the specified index
			for (var i=0; i<=index; i++) {
				fullValue += data[i].value;
			}
		}

		if (typeof fullValue === 'undefined') {
			fullValue = currValue;
		}

		// now convert the full value to an angle
		var angle = (fullValue / totalSize) * 360;

		// lastly, if we want the midpoint, factor that sucker in
		if (options.midpoint) {
			var currAngle = (currValue / totalSize) * 360;
			angle -= (currAngle / 2);
		}

		return angle;
	},

	getPercentage: function(pie, index, decimalPlaces) {
		var relativeAmount = pie.options.data.content[index].value / pie.totalSize;
		if (decimalPlaces <= 0) {
			return Math.round(relativeAmount * 100);
		} else {
			return (relativeAmount * 100).toFixed(decimalPlaces);
		}
	}

};

	//// --------- text.js -----------
var text = {
	offscreenCoord: -10000,

	addTitle: function(pie) {
		var title = pie.svg.selectAll("." + pie.cssPrefix + "title")
			.data([pie.options.header.title])
			.enter()
			.append("text")
			.text(function(d) { return d.text; })
			.attr({
        id: pie.cssPrefix + "title",
        class: pie.cssPrefix + "title",
        x: text.offscreenCoord,
        y: text.offscreenCoord
      })
			.attr("text-anchor", function() {
				var location;
				if (pie.options.header.location === "top-center" || pie.options.header.location === "pie-center") {
					location = "middle";
				} else {
					location = "left";
				}
				return location;
			})
			.attr("fill", function(d) { return d.color; })
			.style("font-size", function(d) { return d.fontSize + "px"; })
			.style("font-family", function(d) { return d.font; });
	},

	positionTitle: function(pie) {
		var textComponents = pie.textComponents;
		var headerLocation = pie.options.header.location;
		var canvasPadding = pie.options.misc.canvasPadding;
		var canvasWidth = pie.options.size.canvasWidth;
		var titleSubtitlePadding = pie.options.header.titleSubtitlePadding;

		var x;
		if (headerLocation === "top-left") {
			x = canvasPadding.left;
		} else {
			x = ((canvasWidth - canvasPadding.right) / 2) + canvasPadding.left;
		}

    // add whatever offset has been added by user
    x += pie.options.misc.pieCenterOffset.x;

		var y = canvasPadding.top + textComponents.title.h;

		if (headerLocation === "pie-center") {
			y = pie.pieCenter.y;

			// still not fully correct
			if (textComponents.subtitle.exists) {
				var totalTitleHeight = textComponents.title.h + titleSubtitlePadding + textComponents.subtitle.h;
				y = y - (totalTitleHeight / 2) + textComponents.title.h;
			} else {
				y += (textComponents.title.h / 4);
			}
		}

		pie.svg.select("#" + pie.cssPrefix + "title")
			.attr("x", x)
			.attr("y", y);
	},

	addSubtitle: function(pie) {
		var headerLocation = pie.options.header.location;

		pie.svg.selectAll("." + pie.cssPrefix + "subtitle")
			.data([pie.options.header.subtitle])
			.enter()
			.append("text")
			.text(function(d) { return d.text; })
			.attr("x", text.offscreenCoord)
			.attr("y", text.offscreenCoord)
			.attr("id", pie.cssPrefix + "subtitle")
			.attr("class", pie.cssPrefix + "subtitle")
			.attr("text-anchor", function() {
				var location;
				if (headerLocation === "top-center" || headerLocation === "pie-center") {
					location = "middle";
				} else {
					location = "left";
				}
				return location;
			})
			.attr("fill", function(d) { return d.color; })
			.style("font-size", function(d) { return d.fontSize + "px"; })
			.style("font-family", function(d) { return d.font; });
	},

	positionSubtitle: function(pie) {
		var canvasPadding = pie.options.misc.canvasPadding;
		var canvasWidth = pie.options.size.canvasWidth;

		var x;
		if (pie.options.header.location === "top-left") {
			x = canvasPadding.left;
		} else {
			x = ((canvasWidth - canvasPadding.right) / 2) + canvasPadding.left;
		}

    // add whatever offset has been added by user
    x += pie.options.misc.pieCenterOffset.x;

		var y = text.getHeaderHeight(pie);
		pie.svg.select("#" + pie.cssPrefix + "subtitle")
			.attr("x", x)
			.attr("y", y);
	},

	addFooter: function(pie) {
		pie.svg.selectAll("." + pie.cssPrefix + "footer")
			.data([pie.options.footer])
			.enter()
			.append("text")
			.text(function(d) { return d.text; })
			.attr("x", text.offscreenCoord)
			.attr("y", text.offscreenCoord)
			.attr("id", pie.cssPrefix + "footer")
			.attr("class", pie.cssPrefix + "footer")
			.attr("text-anchor", function() {
				var location = "left";
				if (pie.options.footer.location === "bottom-center") {
					location = "middle";
				} else if (pie.options.footer.location === "bottom-right") {
					location = "left"; // on purpose. We have to change the x-coord to make it properly right-aligned
				}
				return location;
			})
			.attr("fill", function(d) { return d.color; })
			.style("font-size", function(d) { return d.fontSize + "px"; })
			.style("font-family", function(d) { return d.font; });
	},

	positionFooter: function(pie) {
		var footerLocation = pie.options.footer.location;
		var footerWidth = pie.textComponents.footer.w;
		var canvasWidth = pie.options.size.canvasWidth;
		var canvasHeight = pie.options.size.canvasHeight;
		var canvasPadding = pie.options.misc.canvasPadding;

		var x;
		if (footerLocation === "bottom-left") {
			x = canvasPadding.left;
		} else if (footerLocation === "bottom-right") {
			x = canvasWidth - footerWidth - canvasPadding.right;
		} else {
			x = canvasWidth / 2; // TODO - shouldn't this also take into account padding?
		}

		pie.svg.select("#" + pie.cssPrefix + "footer")
			.attr("x", x)
			.attr("y", canvasHeight - canvasPadding.bottom);
	},

	getHeaderHeight: function(pie) {
		var h;
		if (pie.textComponents.title.exists) {

			// if the subtitle isn't defined, it'll be set to 0
			var totalTitleHeight = pie.textComponents.title.h + pie.options.header.titleSubtitlePadding + pie.textComponents.subtitle.h;
			if (pie.options.header.location === "pie-center") {
				h = pie.pieCenter.y - (totalTitleHeight / 2) + totalTitleHeight;
			} else {
				h = totalTitleHeight + pie.options.misc.canvasPadding.top;
			}
		} else {
			if (pie.options.header.location === "pie-center") {
				var footerPlusPadding = pie.options.misc.canvasPadding.bottom + pie.textComponents.footer.h;
				h = ((pie.options.size.canvasHeight - footerPlusPadding) / 2) + pie.options.misc.canvasPadding.top + (pie.textComponents.subtitle.h / 2);
			} else {
				h = pie.options.misc.canvasPadding.top + pie.textComponents.subtitle.h;
			}
		}
		return h;
	}
};

  //// --------- validate.js -----------
var tt = {
	addTooltips: function(pie) {

		// group the label groups (label, percentage, value) into a single element for simpler positioning
		var tooltips = pie.svg.insert("g")
			.attr("class", pie.cssPrefix + "tooltips");

    tooltips.selectAll("." + pie.cssPrefix + "tooltip")
      .data(pie.options.data.content)
      .enter()
      .append("g")
        .attr("class", pie.cssPrefix + "tooltip")
        .attr("id", function(d, i) { return pie.cssPrefix + "tooltip" + i; })
        .style("opacity", 0)
      .append("rect")
        .attr({
			    rx: pie.options.tooltips.styles.borderRadius,
			    ry: pie.options.tooltips.styles.borderRadius,
			    x: -pie.options.tooltips.styles.padding,
			    opacity: pie.options.tooltips.styles.backgroundOpacity
		    })
		    .style("fill", pie.options.tooltips.styles.backgroundColor);

    tooltips.selectAll("." + pie.cssPrefix + "tooltip")
      .data(pie.options.data.content)
      .append("text")
        .attr("fill", function(d) { return pie.options.tooltips.styles.color; })
        .style("font-size", function(d) { return pie.options.tooltips.styles.fontSize; })
        .style("font-family", function(d) { return pie.options.tooltips.styles.font; })
        .text(function(d, i) {
          var caption = pie.options.tooltips.string;
          if (pie.options.tooltips.type === "caption") {
            caption = d.caption;
          }
          return tt.replacePlaceholders(pie, caption, i, {
            label: d.label,
            value: d.value,
            percentage: segments.getPercentage(pie, i, pie.options.labels.percentage.decimalPlaces)
          });
        });

		tooltips.selectAll("." + pie.cssPrefix + "tooltip rect")
			.attr({
				width: function (d, i) {
					var dims = helpers.getDimensions(pie.cssPrefix + "tooltip" + i);
					return dims.w + (2 * pie.options.tooltips.styles.padding);
				},
				height: function (d, i) {
					var dims = helpers.getDimensions(pie.cssPrefix + "tooltip" + i);
					return dims.h + (2 * pie.options.tooltips.styles.padding);
				},
				y: function (d, i) {
					var dims = helpers.getDimensions(pie.cssPrefix + "tooltip" + i);
					return -(dims.h / 2) + 1;
				}
			});
	},

  showTooltip: function(pie, index) {

	  var fadeInSpeed = pie.options.tooltips.styles.fadeInSpeed;
	  if (tt.currentTooltip === index) {
		  fadeInSpeed = 1;
	  }

    tt.currentTooltip = index;
    d3.select("#" + pie.cssPrefix + "tooltip" + index)
      .transition()
      .duration(fadeInSpeed)
      .style("opacity", function() { return 1; });

    tt.moveTooltip(pie);
  },

  moveTooltip: function(pie) {
    d3.selectAll("#" + pie.cssPrefix + "tooltip" + tt.currentTooltip)
      .attr("transform", function(d) {
        var mouseCoords = d3.mouse(this.parentNode);
        var x = mouseCoords[0] + pie.options.tooltips.styles.padding + 2;
        var y = mouseCoords[1] - (2 * pie.options.tooltips.styles.padding) - 2;
        return "translate(" + x + "," + y + ")";
      });
  },

  hideTooltip: function(pie, index) {
    d3.select("#" + pie.cssPrefix + "tooltip" + index)
      .style("opacity", function() { return 0; });

    // move the tooltip offscreen. This ensures that when the user next mouseovers the segment the hidden
    // element won't interfere
    d3.select("#" + pie.cssPrefix + "tooltip" + tt.currentTooltip)
       .attr("transform", function(d, i) {

         // klutzy, but it accounts for tooltip padding which could push it onscreen
         var x = pie.options.size.canvasWidth + 1000;
         var y = pie.options.size.canvasHeight + 1000;
         return "translate(" + x + "," + y + ")";
       });
  },

  replacePlaceholders: function(pie, str, index, replacements) {

    // if the user has defined a placeholderParser function, call it before doing the replacements
    if (helpers.isFunction(pie.options.tooltips.placeholderParser)) {
      pie.options.tooltips.placeholderParser(index, replacements);
    }

    var replacer = function()  {
      return function(match) {
        var placeholder = arguments[1];
        if (replacements.hasOwnProperty(placeholder)) {
          return replacements[arguments[1]];
        } else {
          return arguments[0];
        }
      };
    };
    return str.replace(/\{(\w+)\}/g, replacer(replacements));
  }
};


	// --------------------------------------------------------------------------------------------

	// our constructor
	var d3pie = function(element, options) {

		// element can be an ID or DOM element
		this.element = element;
		if (typeof element === "string") {
			var el = element.replace(/^#/, ""); // replace any jQuery-like ID hash char
			this.element = document.getElementById(el);
		}

		var opts = {};
		extend(true, opts, defaultSettings, options);
		this.options = opts;

		// if the user specified a custom CSS element prefix (ID, class), use it
		if (this.options.misc.cssPrefix !== null) {
			this.cssPrefix = this.options.misc.cssPrefix;
		} else {
			this.cssPrefix = "p" + _uniqueIDCounter + "_";
			_uniqueIDCounter++;
		}


		// now run some validation on the user-defined info
		if (!validate.initialCheck(this)) {
			return;
		}

		// add a data-role to the DOM node to let anyone know that it contains a d3pie instance, and the d3pie version
		d3.select(this.element).attr(_scriptName, _version);

		// things that are done once
		this.options.data.content = math.sortPieData(this);
		if (this.options.data.smallSegmentGrouping.enabled) {
			this.options.data.content = helpers.applySmallSegmentGrouping(this.options.data.content, this.options.data.smallSegmentGrouping);
		}
		this.options.colors = helpers.initSegmentColors(this);
		this.totalSize      = math.getTotalPieSize(this.options.data.content);

		_init.call(this);
	};

	d3pie.prototype.recreate = function() {
		// now run some validation on the user-defined info
		if (!validate.initialCheck(this)) {
			return;
		}
		this.options.data.content = math.sortPieData(this);
		if (this.options.data.smallSegmentGrouping.enabled) {
			this.options.data.content = helpers.applySmallSegmentGrouping(this.options.data.content, this.options.data.smallSegmentGrouping);
		}
		this.options.colors = helpers.initSegmentColors(this);
		this.totalSize      = math.getTotalPieSize(this.options.data.content);

		_init.call(this);
	};

	d3pie.prototype.redraw = function() {
		this.element.innerHTML = "";
		_init.call(this);
	};

	d3pie.prototype.destroy = function() {
		this.element.innerHTML = ""; // clear out the SVG
		d3.select(this.element).attr(_scriptName, null); // remove the data attr
	};

	/**
	 * Returns all pertinent info about the current open info. Returns null if nothing's open, or if one is, an object of
	 * the following form:
	 * 	{
	 * 	  element: DOM NODE,
	 * 	  index: N,
	 * 	  data: {}
	 * 	}
	 */
	d3pie.prototype.getOpenSegment = function() {
		var segment = this.currentlyOpenSegment;
		if (segment !== null && typeof segment !== "undefined") {
			var index = parseInt(d3.select(segment).attr("data-index"), 10);
			return {
				element: segment,
				index: index,
				data: this.options.data.content[index]
			};
		} else {
			return null;
		}
	};

	d3pie.prototype.openSegment = function(index) {
		index = parseInt(index, 10);
		if (index < 0 || index > this.options.data.content.length-1) {
			return;
		}
		segments.openSegment(this, d3.select("#" + this.cssPrefix + "segment" + index).node());
	};

	d3pie.prototype.closeSegment = function() {
		var segment = this.currentlyOpenSegment;
		if (segment) {
			segments.closeSegment(this, segment);
		}
	};

	// this let's the user dynamically update aspects of the pie chart without causing a complete redraw. It
	// intelligently re-renders only the part of the pie that the user specifies. Some things cause a repaint, others
	// just redraw the single element
	d3pie.prototype.updateProp = function(propKey, value) {
		switch (propKey) {
			case "header.title.text":
				var oldVal = helpers.processObj(this.options, propKey);
				helpers.processObj(this.options, propKey, value);
				d3.select("#" + this.cssPrefix + "title").html(value);
				if ((oldVal === "" && value !== "") || (oldVal !== "" && value === "")) {
					this.redraw();
				}
				break;

			case "header.subtitle.text":
				var oldValue = helpers.processObj(this.options, propKey);
				helpers.processObj(this.options, propKey, value);
				d3.select("#" + this.cssPrefix + "subtitle").html(value);
				if ((oldValue === "" && value !== "") || (oldValue !== "" && value === "")) {
					this.redraw();
				}
				break;

			case "callbacks.onload":
			case "callbacks.onMouseoverSegment":
			case "callbacks.onMouseoutSegment":
			case "callbacks.onClickSegment":
			case "effects.pullOutSegmentOnClick.effect":
			case "effects.pullOutSegmentOnClick.speed":
			case "effects.pullOutSegmentOnClick.size":
			case "effects.highlightSegmentOnMouseover":
			case "effects.highlightLuminosity":
				helpers.processObj(this.options, propKey, value);
				break;

			// everything else, attempt to update it & do a repaint
			default:
				helpers.processObj(this.options, propKey, value);

				this.destroy();
				this.recreate();
				break;
		}
	};


	// ------------------------------------------------------------------------------------------------


	var _init = function() {

		// prep-work
		this.svg = helpers.addSVGSpace(this);

		// store info about the main text components as part of the d3pie object instance
		this.textComponents = {
			headerHeight: 0,
			title: {
				exists: this.options.header.title.text !== "",
				h: 0,
				w: 0
			},
			subtitle: {
				exists: this.options.header.subtitle.text !== "",
				h: 0,
				w: 0
			},
			footer: {
				exists: this.options.footer.text !== "",
				h: 0,
				w: 0
			}
		};

		this.outerLabelGroupData = [];

		// add the key text components offscreen (title, subtitle, footer). We need to know their widths/heights for later computation
		if (this.textComponents.title.exists) {
			text.addTitle(this);
		}
		if (this.textComponents.subtitle.exists) {
			text.addSubtitle(this);
		}
		text.addFooter(this);

		// the footer never moves. Put it in place now
		var self = this;
		helpers.whenIdExists(this.cssPrefix + "footer", function() {
			text.positionFooter(self);
			var d3 = helpers.getDimensions(self.cssPrefix + "footer");
			self.textComponents.footer.h = d3.h;
			self.textComponents.footer.w = d3.w;
		});

		// now create the pie chart and position everything accordingly
		var reqEls = [];
		if (this.textComponents.title.exists)    { reqEls.push(this.cssPrefix + "title"); }
		if (this.textComponents.subtitle.exists) { reqEls.push(this.cssPrefix + "subtitle"); }
		if (this.textComponents.footer.exists)   { reqEls.push(this.cssPrefix + "footer"); }

		helpers.whenElementsExist(reqEls, function() {
			if (self.textComponents.title.exists) {
				var d1 = helpers.getDimensions(self.cssPrefix + "title");
				self.textComponents.title.h = d1.h;
				self.textComponents.title.w = d1.w;
			}
			if (self.textComponents.subtitle.exists) {
				var d2 = helpers.getDimensions(self.cssPrefix + "subtitle");
				self.textComponents.subtitle.h = d2.h;
				self.textComponents.subtitle.w = d2.w;
			}
			// now compute the full header height
			if (self.textComponents.title.exists || self.textComponents.subtitle.exists) {
				var headerHeight = 0;
				if (self.textComponents.title.exists) {
					headerHeight += self.textComponents.title.h;
					if (self.textComponents.subtitle.exists) {
						headerHeight += self.options.header.titleSubtitlePadding;
					}
				}
				if (self.textComponents.subtitle.exists) {
					headerHeight += self.textComponents.subtitle.h;
				}
				self.textComponents.headerHeight = headerHeight;
			}

			// at this point, all main text component dimensions have been calculated
			math.computePieRadius(self);

			// this value is used all over the place for placing things and calculating locations. We figure it out ONCE
			// and store it as part of the object
			math.calculatePieCenter(self);

			// position the title and subtitle
			text.positionTitle(self);
			text.positionSubtitle(self);

			// now create the pie chart segments, and gradients if the user desired
			if (self.options.misc.gradient.enabled) {
				segments.addGradients(self);
			}
			segments.create(self); // also creates this.arc
			labels.add(self, "inner", self.options.labels.inner.format);
			labels.add(self, "outer", self.options.labels.outer.format);

			// position the label elements relatively within their individual group (label, percentage, value)
			labels.positionLabelElements(self, "inner", self.options.labels.inner.format);
			labels.positionLabelElements(self, "outer", self.options.labels.outer.format);
			labels.computeOuterLabelCoords(self);

			// this is (and should be) dumb. It just places the outer groups at their calculated, collision-free positions
			labels.positionLabelGroups(self, "outer");

			// we use the label line positions for many other calculations, so ALWAYS compute them
			labels.computeLabelLinePositions(self);

			// only add them if they're actually enabled
			if (self.options.labels.lines.enabled && self.options.labels.outer.format !== "none") {
				labels.addLabelLines(self);
			}

			labels.positionLabelGroups(self, "inner");
			labels.fadeInLabelsAndLines(self);

      // add and position the tooltips
      if (self.options.tooltips.enabled) {
        tt.addTooltips(self);
      }

      segments.addSegmentEventHandlers(self);
		});
	};

  return d3pie;
}));