<?php
/**
 *## TbGoogleVisualizationChart class file
 *
 * @author: antonio ramirez <antonio@clevertech.biz>
 * @copyright Copyright &copy; Clevertech 2012-
 * @license http://www.opensource.org/licenses/bsd-license.php New BSD License
 */

/**
 *## TbGoogleVisualizationChart widget
 *
 * Makes use of the Google Visualization service to render charts
 * @see https://developers.google.com/chart/interactive/docs/gallery
 *
 * @package booster.widgets.charts
 */
class TbGoogleVisualizationChart extends CWidget
{
	/**
	 * @var string $containerId the container Id to render the visualization to
	 */
	public $containerId;

	/**
	 * @var string $visualization the type of visualization -ie PieChart
	 * @see https://google-developers.appspot.com/chart/interactive/docs/gallery
	 */
	public $visualization;

	/**
	 * @var array $data the data to configure visualization
	 * @see https://google-developers.appspot.com/chart/interactive/docs/datatables_dataviews#arraytodatatable
	 */
	public $data = array();

	/**
	 * @var array $options additional configuration options
	 * @see https://google-developers.appspot.com/chart/interactive/docs/customizing_charts
	 */
	public $options = array();

	/**
	 * @var array $htmlOption the HTML tag attributes configuration
	 */
	public $htmlOptions = array();

	/**
	 * Widget's run method
	 */
	public function run()
	{
		$id = $this->getId();
		$this->htmlOptions['id'] = $id;
		// if no container is set, it will create one
		if ($this->containerId == null) {
			$this->containerId = 'div-chart' . $id;
			echo '<div ' . CHtml::renderAttributes($this->htmlOptions) . '></div>';
		}
		$this->registerClientScript();
	}

	/**
	 * Registers required scripts
	 */
	public function registerClientScript()
	{
		$id = $this->getId();
		$jsData = CJavaScript::jsonEncode($this->data);
		$jsOptions = CJavaScript::jsonEncode($this->options);

		$script = '
			google.setOnLoadCallback(drawChart' . $id . ');
			var ' . $id . '=null;
			function drawChart' . $id . '() {
				var data = google.visualization.arrayToDataTable(' . $jsData . ');

				var options = ' . $jsOptions . ';

				' . $id . ' = new google.visualization.' . $this->visualization . '(document.getElementById("' . $this->containerId . '"));
				' . $id . '.draw(data, options);
			}';

		/** @var $cs CClientScript */
		$cs = Yii::app()->getClientScript();
		$cs->registerScriptFile('https://www.google.com/jsapi');
		$cs->registerScript(
			__CLASS__ . '#' . $id,
			'google.load("visualization", "1", {packages:["corechart"]});',
			CClientScript::POS_HEAD
		);
		$cs->registerScript($id, $script, CClientScript::POS_HEAD);
	}
}
