<?php defined('SYSPATH') or die('No direct access allowed.');

/**
 * This class provides access to HighCharts Chart Drawing
 *
 * @package    HighChart
 * @category   Helper
 * @author     Deon George
 * @copyright  (c) 2012-2013 Deon George
 * @license    http://dev.leenooks.net/license.html
 */
abstract class HighChart {
	protected $_series = array();

	protected $_divname = 'hchart';

	// Chart title
	protected $_title = '';

	// Default chart size.
	protected $_height = '300';
	protected $_width = '575'; 
	protected $_ymetric = '';

	// Colors to use for series
	private $_series_colours = array('AAACCC','E0E0E0','CCC888','EEEBBB','666CCC','888888');

	// Render the chart data in a json format
	abstract public function json();

	// Our child class should define how to render as a string
	abstract public function render();

	public function __call($name,$args) {
		switch ($name) {
			case 'div': $this->_divname = array_shift($args);
				break;
			case 'height': $this->_height = array_shift($args);
				break;
			case 'title': $this->_title = array_shift($args);
				break;
			case 'width': $this->_width = array_shift($args);
				break;
			case 'ymetric': $this->_ymetric = array_shift($args);
				break;
			default:
				throw new Kohana_Exception('Unknown method :name',array(':name'=>$name));
		}

		return $this;
	}

	/**
	 * Render the URL that generates the graph
	 */
	final public function __toString() {
		try {
			return (string)$this->render();
		} catch (Exception $e) {
			echo Debug::vars(array('m'=>__METHOD__,'e'=>$e));die();
		}
	}

	/**
	 * Pick the driver that will render the graph
	 * @param $class The child class to invoke
	 */
	final public static function factory($class) {
		$c = sprintf('%s_%s',get_called_class(),$class);

		if (! class_exists($c))
			throw new Kohana_Exception('Unknown HighChart Type :class',array(':class'=>$class));
		else
			return new $c();
	}

	public function series($type,$axis) {
		if (! in_array($type,$this->_valid_axis))
			throw new Kohana_Exception('Type not allowed for Chart :type',array(':type'=>$type));

		$x = 'HighChart_Type_'.ucfirst($type);
		if (! class_exists($x))
			throw new Kohana_Exception('Class does not exist :class',array(':class'=>$x));

		if (! isset($this->_series[$axis]))
			$this->_series[$axis] = array();

		$c = count($this->_series[$axis]);

		$this->_series[$axis][$c] = new $x;

		return $this->_series[$axis][$c];
	}

	/**
	 * Return the colors that will be used for this series
	 */
	protected function series_colour($c) {
		if (is_null($c))
			return NULL;

		static $colours = NULL;
		
		if (is_null($colours))
			$colors = count($this->_series_colours);

		return '#'.$this->_series_colours[$c%$colors];
	}
}
?>