(function (root, factory) {
	// if (typeof define === 'function' && define.amd) {
	// 	// AMD. Register as an anonymous module.
	// 	define([], function () {
	// 		return (root.returnExportsGlobal = factory());
	// 	});
	// } else if (typeof exports === 'object') {
	// 	// Node. Does not work with strict CommonJS, but
	// 	// only CommonJS-like enviroments that support module.exports,
	// 	// like Node.
	// 	module.exports = factory();
	// } else {
		root['Chartist.plugins.ctAxisTitle'] = factory();
	// }
}(this, function () {

	/**
	 * Chartist.js plugin to display a title for 1 or 2 axises.
	 *
	 */
	/* global Chartist */
	(function (window, document, Chartist) {
		'use strict';

		var axisDefaults = {
			axisTitle: '',
			axisClass: 'ct-axis-title',
			offset: {
				x: 0,
				y: 0
			},
			textAnchor: 'middle',
			flipText: false
		};
		var defaultOptions = {
			axisX: axisDefaults,
			axisY: axisDefaults
		};

		Chartist.plugins = Chartist.plugins || {};
		Chartist.plugins.ctAxisTitle = function (options) {

			options = Chartist.extend({}, defaultOptions, options);

			return function ctAxisTitle(chart) {

				chart.on('created', function (data) {
					//
					// if (!options.axisX.axisTitle && !options.axisY.axisTitle) {
					// 	throw new Error('ctAxisTitle plugin - You must provide at least one axis title');
					// } else if (!data.axisX && !data.axisY) {
					// 	throw new Error('ctAxisTitle plugin can only be used on charts that have at least one axis');
					// }

					var xPos;
					var yPos;
					var title;

					//position axis X title
					if (options.axisX.axisTitle && data.axisX) {

						xPos = (data.axisX.axisLength / 2) + data.options.axisY.offset + data.options.chartPadding.left;

						yPos = data.options.chartPadding.top;

						if (data.options.axisY.position === 'end') {
							xPos -= data.options.axisY.offset;
						}

						if (data.options.axisX.position === 'end') {
							yPos += data.axisY.axisLength;
						}

						title = new Chartist.Svg("text");
						title.addClass(options.axisX.axisClass);
						title.text(options.axisX.axisTitle);
						title.attr({
							x: xPos + options.axisX.offset.x,
							y: yPos + options.axisX.offset.y,
							"text-anchor": options.axisX.textAnchor
						});

						data.svg.append(title, true);

					}

					//position axis Y title
					if (options.axisY.axisTitle && data.axisY) {
						xPos = 0;


						yPos = (data.axisY.axisLength / 2) + data.options.chartPadding.top;

						if (data.options.axisX.position === 'start') {
							yPos += data.options.axisX.offset;
						}

						if (data.options.axisY.position === 'end') {
							xPos = data.axisX.axisLength;
						}

						var transform = 'rotate(' + (options.axisY.flipText ? -90 : 90) + ', ' + xPos + ', ' + yPos + ')';

						title = new Chartist.Svg("text");
						title.addClass(options.axisY.axisClass);
						title.text(options.axisY.axisTitle);
						title.attr({
							x: xPos + options.axisY.offset.x,
							y: yPos + options.axisY.offset.y,
							transform: transform,
							"text-anchor": options.axisY.textAnchor
						});

						data.svg.append(title, true);

					}

				});
			};
		};

	}(window, document, Chartist));

	return Chartist.plugins.ctAxisTitle;

}));