<?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();
}
}