/**

 * @license Highstock JS v2.1.9 (2015-10-07)

 * Plugin for displaying a message when there is no data visible in chart.

 *

 * (c) 2010-2014 Highsoft AS

 * Author: Oystein Moseng

 *

 * License: www.highcharts.com/license

 */



(function (H) {

	

	var seriesTypes = H.seriesTypes,

		chartPrototype = H.Chart.prototype,

		defaultOptions = H.getOptions(),

		extend = H.extend,

		each = H.each;



	// Add language option

	extend(defaultOptions.lang, {

		noData: 'No data to display'

	});

	

	// Add default display options for message

	defaultOptions.noData = {

		position: {

			x: 0,

			y: 0,			

			align: 'center',

			verticalAlign: 'middle'

		},

		attr: {						

		},

		style: {	

			fontWeight: 'bold',		

			fontSize: '12px',

			color: '#60606a'		

		}

		// useHTML: false // docs

	};



	/**

	 * Define hasData functions for series. These return true if there are data points on this series within the plot area

	 */	

	function hasDataPie() {

		return !!this.points.length; /* != 0 */

	}



	each(['pie', 'gauge', 'waterfall', 'bubble'], function (type) {

		if (seriesTypes[type]) {

			seriesTypes[type].prototype.hasData = hasDataPie;

		}

	});



	H.Series.prototype.hasData = function () {

		return this.visible && this.dataMax !== undefined && this.dataMin !== undefined; // #3703

	};

	

	/**

	 * Display a no-data message.

	 *

	 * @param {String} str An optional message to show in place of the default one 

	 */

	chartPrototype.showNoData = function (str) {

		var chart = this,

			options = chart.options,

			text = str || options.lang.noData,

			noDataOptions = options.noData;



		if (!chart.noDataLabel) {

			chart.noDataLabel = chart.renderer

				.label(

					text, 

					0, 

					0, 

					null, 

					null, 

					null, 

					noDataOptions.useHTML, 

					null, 

					'no-data'

				)

				.attr(noDataOptions.attr)

				.css(noDataOptions.style)

				.add();

			chart.noDataLabel.align(extend(chart.noDataLabel.getBBox(), noDataOptions.position), false, 'plotBox');

		}

	};



	/**

	 * Hide no-data message	

	 */	

	chartPrototype.hideNoData = function () {

		var chart = this;

		if (chart.noDataLabel) {

			chart.noDataLabel = chart.noDataLabel.destroy();

		}

	};



	/**

	 * Returns true if there are data points within the plot area now

	 */	

	chartPrototype.hasData = function () {

		var chart = this,

			series = chart.series,

			i = series.length;



		while (i--) {

			if (series[i].hasData() && !series[i].options.isInternal) { 

				return true;

			}	

		}



		return false;

	};



	/**

	 * Show no-data message if there is no data in sight. Otherwise, hide it.

	 */

	function handleNoData() {

		var chart = this;

		if (chart.hasData()) {

			chart.hideNoData();

		} else {

			chart.showNoData();

		}

	}



	/**

	 * Add event listener to handle automatic display of no-data message

	 */

	chartPrototype.callbacks.push(function (chart) {

		H.addEvent(chart, 'load', handleNoData);

		H.addEvent(chart, 'redraw', handleNoData);

	});



}(Highcharts));

