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 <?php
 /**
  * LICENSE
  *
  * This source file is subject to the new BSD license that is bundled
  * with this package in the file LICENSE.txt.
  * It is also available through the world-wide-web at this URL:
  * http://framework.zend.com/license/new-bsd
  * 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@zend.com so we can send you a copy immediately.
  *
  * @category   Zend
  * @package    Zend_ProgressBar
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  * @version    $Id$
  */
 
 /**
  * Zend_ProgressBar offers an interface for multiple enviroments.
  *
  * @category  Zend
  * @package   Zend_ProgressBar
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license   http://framework.zend.com/license/new-bsd     New BSD License
  */
 class Zend_ProgressBar
 {
     /**
      * Min value
      *
      * @var float
      */
     protected $_min;
 
     /**
      * Max value
      *
      * @var float
      */
     protected $_max;
 
     /**
      * Current value
      *
      * @var float
      */
     protected $_current;
 
     /**
      * Start time of the progressbar, required for ETA
      *
      * @var integer
      */
     protected $_startTime;
 
     /**
      * Current status text
      *
      * @var string
      */
     protected $_statusText = null;
 
     /**
      * Adapter for the output
      *
      * @var Zend_ProgressBar_Adapter
      */
     protected $_adapter;
 
     /**
      * Namespace for keeping the progressbar persistent
      *
      * @var string
      */
     protected $_persistenceNamespace = null;
 
     /**
      * Create a new progressbar backend.
      *
      * @param  Zend_ProgressBar_Adapter $adapter
      * @param  float                    $min
      * @param  float                    $max
      * @param  string                   $persistenceNamespace
      * @throws Zend_ProgressBar_Exception When $min is greater than $max
      */
     public function __construct(Zend_ProgressBar_Adapter $adapter, $min = 0, $max = 100, $persistenceNamespace = null)
     {
         // Check min/max values and set them
         if ($min > $max) {
             // require_once 'Zend/ProgressBar/Exception.php';
             throw new Zend_ProgressBar_Exception('$max must be greater than $min');
         }
 
         $this->_min     = (float) $min;
         $this->_max     = (float) $max;
         $this->_current = (float) $min;
 
         // See if we have to open a session namespace
         if ($persistenceNamespace !== null) {
             // require_once 'Zend/Session/Namespace.php';
 
             $this->_persistenceNamespace = new Zend_Session_Namespace($persistenceNamespace);
         }
 
         // Set adapter
         $this->_adapter = $adapter;
 
         // Track the start time
         $this->_startTime = time();
 
         // See If a persistenceNamespace exists and handle accordingly
         if ($this->_persistenceNamespace !== null) {
             if (isset($this->_persistenceNamespace->isSet)) {
                 $this->_startTime  = $this->_persistenceNamespace->startTime;
                 $this->_current    = $this->_persistenceNamespace->current;
                 $this->_statusText = $this->_persistenceNamespace->statusText;
             } else {
                 $this->_persistenceNamespace->isSet      = true;
                 $this->_persistenceNamespace->startTime  = $this->_startTime;
                 $this->_persistenceNamespace->current    = $this->_current;
                 $this->_persistenceNamespace->statusText = $this->_statusText;
             }
         } else {
             $this->update();
         }
     }
 
     /**
      * Get the current adapter
      *
      * @return Zend_ProgressBar_Adapter
      */
     public function getAdapter()
     {
         return $this->_adapter;
     }
 
     /**
      * Update the progressbar
      *
      * @param  float  $value
      * @param  string $text
      * @return void
      */
     public function update($value = null, $text = null)
     {
         // Update value if given
         if ($value !== null) {
             $this->_current = min($this->_max, max($this->_min, $value));
         }
 
         // Update text if given
         if ($text !== null) {
             $this->_statusText = $text;
         }
 
         // See if we have to update a namespace
         if ($this->_persistenceNamespace !== null) {
             $this->_persistenceNamespace->current    = $this->_current;
             $this->_persistenceNamespace->statusText = $this->_statusText;
         }
 
         // Calculate percent
         if ($this->_min === $this->_max) {
             $percent = false;
         } else {
             $percent = (float) ($this->_current - $this->_min) / ($this->_max - $this->_min);
         }
 
         // Calculate ETA
         $timeTaken = time() - $this->_startTime;
 
         if ($percent === .0 || $percent === false) {
             $timeRemaining = null;
         } else {
             $timeRemaining = round(((1 / $percent) * $timeTaken) - $timeTaken);
         }
 
         // Poll the adapter
         $this->_adapter->notify($this->_current, $this->_max, $percent, $timeTaken, $timeRemaining, $this->_statusText);
     }
 
     /**
      * Update the progressbar to the next value
      *
      * @param  string $text
      * @return void
      */
     public function next($diff = 1, $text = null)
     {
         $this->update(max($this->_min, min($this->_max, $this->_current + $diff)), $text);
     }
 
     /**
      * Call the adapters finish() behaviour
      *
      * @return void
      */
     public function finish()
     {
         if ($this->_persistenceNamespace !== null) {
             unset($this->_persistenceNamespace->isSet);
         }
 
         $this->_adapter->finish();
     }
 }