<?php

/**
 * Zend Framework
 *
 * 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_Cache
 * @subpackage Backend
 * @copyright  Copyright (c) 2005-2007 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */

 
/**
 * Zend_Cache_Backend_Interface
 */
require_once 'Zend/Cache/Backend/Interface.php';


/**
 * @package    Zend_Cache
 * @subpackage Backend
 * @copyright  Copyright (c) 2005-2007 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Cache_Backend_Test implements Zend_Cache_Backend_Interface 
{
    
    // ------------------
    // --- Properties ---
    // ------------------
       
    /**
     * Available options
     * 
     * @var array available options
     */
    private $_options = array();
  
    /**
     * Frontend or Core directives
     * 
     * @var array directives
     */
    private $_directives = array();
    
    /**
     * Array to log actions
     * 
     * @var array $_log
     */
    private $_log = array();
    
    /**
     * Current index for log array
     * 
     * @var int $_index
     */
    private $_index = 0;
    
    
    // ----------------------
    // --- Public methods ---
    // ----------------------
    
    /**
     * Constructor
     * 
     * @param array $options associative array of options
     */
    public function __construct($options = array())
    {      
        $this->_addLog('construct', array($options));
    }
    
    /**
     * Set the frontend directives
     * 
     * @param array $directives assoc of directives
     */
    public function setDirectives($directives)
    {
        $this->_addLog('setDirectives', array($directives));
    } 
    
    /**
     * Test if a cache is available for the given id and (if yes) return it (false else)
     * 
     * For this test backend only, if $id == 'false', then the method will return false
     * if $id == 'serialized', the method will return a serialized array
     * ('foo' else)
     * 
     * @param string $id cache id
     * @param boolean $doNotTestCacheValidity if set to true, the cache validity won't be tested
     * @return string cached datas (or false)
     */
    public function load($id, $doNotTestCacheValidity = false) 
    {
        $this->_addLog('get', array($id, $doNotTestCacheValidity));
        if ($id=='false') {
            return false;
        }
        if ($id=='serialized') {
            return serialize(array('foo'));
        }
        if (($id=='71769f39054f75894288e397df04e445') or ($id=='615d222619fb20b527168340cebd0578')) {
            return serialize(array('foo', 'bar'));
        }
        return 'foo';
    }
    
    /**
     * Test if a cache is available or not (for the given id)
     * 
     * For this test backend only, if $id == 'false', then the method will return false
     * (123456 else)
     * 
     * @param string $id cache id
     * @return mixed false (a cache is not available) or "last modified" timestamp (int) of the available cache record
     */
    public function test($id)
    {
        $this->_addLog('test', array($id));
        if ($id=='false') {
            return false;
        }
        if (($id=='d8523b3ee441006261eeffa5c3d3a0a7') or ($id=='3c439c922209e2cb0b54d6deffccd75a')) {
            return false;
        }
        return 123456;
    }
    
    /**
     * Save some string datas into a cache record
     *
     * For this test backend only, if $id == 'false', then the method will return false
     * (true else)
     *
     * @param string $data datas to cache
     * @param string $id cache id
     * @param array $tags array of strings, the cache record will be tagged by each string entry
     * @param int $specificLifetime if != false, set a specific lifetime for this cache record (null => infinite lifetime)
     * @return boolean true if no problem
     */
    public function save($data, $id, $tags = array(), $specificLifetime = false)
    {
        $this->_addLog('save', array($data, $id, $tags));
        if ($id=='false') {
            return false;
        }
        return true;
    }
    
    /**
     * Remove a cache record
     * 
     * For this test backend only, if $id == 'false', then the method will return false
     * (true else)
     * 
     * @param string $id cache id
     * @return boolean true if no problem
     */
    public function remove($id) 
    {
        $this->_addLog('remove', array($id));
        if ($id=='false') {
            return false;
        }
        return true;
    }
    
    /**
     * Clean some cache records
     *
     * For this test backend only, if $mode == 'false', then the method will return false
     * (true else)
     *
     * Available modes are :
     * Zend_Cache::CLEANING_MODE_ALL (default)    => remove all cache entries ($tags is not used)
     * Zend_Cache::CLEANING_MODE_OLD              => remove too old cache entries ($tags is not used) 
     * Zend_Cache::CLEANING_MODE_MATCHING_TAG     => remove cache entries matching all given tags 
     *                                               ($tags can be an array of strings or a single string) 
     * Zend_Cache::CLEANING_MODE_NOT_MATCHING_TAG => remove cache entries not {matching one of the given tags}
     *                                               ($tags can be an array of strings or a single string)       
     * 
     * @param string $mode clean mode
     * @param tags array $tags array of tags
     * @return boolean true if no problem
     */
    public function clean($mode = Zend_Cache::CLEANING_MODE_ALL, $tags = array()) 
    {
        $this->_addLog('clean', array($mode, $tags));
        if ($mode=='false') {
            return false;
        }
        return true;
    }  
    
    /**
     * Get the last log
     * 
     * @return string the last log
     */
    public function getLastLog()
    {
        return $this->_log[$this->_index - 1];
    }
    
    /**
     * Get the log index
     * 
     * @return int log index
     */
    public function getLogIndex()
    {
        return $this->_index;
    }
    
    /**
     * Get the complete log array
     * 
     * @return array complete log array
     */
    public function getAllLogs()
    {
        return $this->_log;
    }
    
         
    // -----------------------
    // --- Private methods ---
    // -----------------------
    
    /**
     * Add an event to the log array
     * 
     * @param string $methodName methodName
     * @param array $args arguments
     */
    private function _addLog($methodName, $args)
    {
        $this->_log[$this->_index] = array(
            'methodName' => $methodName,
            'args' => $args
        );
        $this->_index = $this->_index + 1;
    }  
    
}
