<?php
/*
* 2007-2011 PrestaShop 
*
* NOTICE OF LICENSE
*
* This source file is subject to the Open Software License (OSL 3.0)
* that is bundled with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://opensource.org/licenses/osl-3.0.php
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to license@prestashop.com so we can send you a copy immediately.
*
* DISCLAIMER
*
* Do not edit or add to this file if you wish to upgrade PrestaShop to newer
* versions in the future. If you wish to customize PrestaShop for your
* needs please refer to http://www.prestashop.com for more information.
*
*  @author PrestaShop SA <contact@prestashop.com>
*  @copyright  2007-2011 PrestaShop SA
*  @version  Release: $Revision: 9827 $
*  @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
*  International Registered Trademark & Property of PrestaShop SA
*/

class ChartCore
{
	protected static $poolId = 0;
	
	protected $width = 600;
	protected $height = 300;
	
	// Time mode
	protected $timeMode = false;
	protected $from;
	protected $to;
	protected $format;
	protected $granularity;
	
	protected $curves = array();
	
	/** @prototype void public static function init(void) */
	public static function init()
	{
		if (!self::$poolId)
		{
			++self::$poolId;
			echo '
		    <!--[if IE]><script type="text/javascript" src="'.PS_BASE_URI.'js/jquery/excanvas.min.js"></script><![endif]-->
		    <script type="text/javascript" src="'.PS_BASE_URI.'js/jquery/jquery.flot.min.js"></script>';
		}
	}
	
	/** @prototype void public function __construct() */
	public function __construct()
	{
		self::init();
		++self::$poolId;
	}
	
	/** @prototype void public function setSize(int $width, int $height) */
	public function setSize($width, $height)
	{
		$this->width = (int)$width;
		$this->height = (int)$height;
	}

	/** @prototype void public function setTimeMode($from, $to, $granularity) */
	public function setTimeMode($from, $to, $granularity)
	{
		$this->granularity = $granularity;
	
		if (Validate::isDate($from))
			$from = strtotime($from);
		$this->from = $from;
		if (Validate::isDate($to))
			$to = strtotime($to);
		$this->to = $to;
		
		if ($granularity == 'd')
			$this->format = '%d/%m/%y';
		if ($granularity == 'w')
			$this->format = '%d/%m/%y';
		if ($granularity == 'm')
			$this->format = '%m/%y';
		if ($granularity == 'y')
			$this->format = '%y';
			
		$this->timeMode = true;
	}
	
	public function getCurve($i)
	{
		if (!array_key_exists($i, $this->curves))
			$this->curves[$i] = new Curve();
		return $this->curves[$i];
	}
	
	/** @prototype void public function display() */
	public function display()
	{
		$options = '';
		if ($this->timeMode)
		{
			$options = 'xaxis:{mode:"time",timeformat:\''.addslashes($this->format).'\',min:'.$this->from.'000,max:'.$this->to.'000}';
			if ($this->granularity == 'd')
				foreach ($this->curves as $curve)
					for ($i = $this->from; $i <= $this->to; $i = strtotime('+1 day', $i))
						if (!$curve->getPoint($i))
							$curve->setPoint($i, 0);
		}
		
		$jsCurves = array();
		foreach ($this->curves as $curve)
			$jsCurves[] = $curve->getValues($this->timeMode);

		if (count($jsCurves))
			echo '
			<div id="flot'.self::$poolId.'" style="width:'.$this->width.'px;height:'.$this->height.'px"></div>
			<script type="text/javascript">
				$(function () {
					$.plot($(\'#flot'.self::$poolId.'\'), ['.implode(',', $jsCurves).'], {'.$options.'});
				});
			</script>';
		else
			echo ErrorFacade::Display(PS_ERROR_UNDEFINED, 'No values for this chart.');
	}
}

class Curve
{
	protected $values = array();
	protected $label;
	protected $type;

	/** @prototype void public function setValues($values) */
	public function setValues($values)
	{
		$this->values = $values;
	}

	public function getValues($timeMode = false)
	{
		ksort($this->values);
		$string = '';
		foreach ($this->values as $key => $value)
			$string .= '['.addslashes((string)$key).($timeMode ? '000' : '').','.(float)$value.'],';
		return '{data:['.rtrim($string, ',').']'.(!empty($this->label) ? ',label:"'.$this->label.'"' : '').''.(!empty($this->type) ? ','.$this->type : '').'}';
	}

	/** @prototype void public function setPoint(float $x, float $y) */
	public function setPoint($x, $y)
	{
		$this->values[(string)$x] = (float)$y;
	}
	
	public function setLabel($label)
	{
		$this->label = $label;
	}
	
	public function setType($type)
	{
		$this->type = '';
		if ($type == 'bars')
			$this->type = 'bars:{show:true}';
		if ($type == 'steps')
			$this->type = 'lines:{show:true,steps:true}';
	}
	
	public function getPoint($x)
	{
		if (array_key_exists((string)$x, $this->values))
			return $this->values[(string)$x];
	}
}