<?php

namespace BRSystems\Core\Library\cApc;

/**
 * Apc cache request class
 *
 * @category LIB APC / APCu
 * @author Mareks Keišs <mareks.keiss@brsystems.lv>
 * @since Version 1.1
 */
class cApc
{
    // APC CURRENTLY USED KEYS - keys need to be picked for universal drop by phrase -
    // for example: in case user is used always add _USER{ID} since that will be the key dropped on user update
    // however if company is involved on all company changes a key containing COMPANIES_TO will be dropped
    //------------------------------------------------------------------
    // [COMPANIES_TO][_USER{ID}] - COMPANIES_TO_USER12
    CONST STORE_LANG_KEY = '_LANG';
    CONST STORE_USER_KEY = '_USER';
    CONST STORE_SESSION = '_SESSION';
    CONST STORE_COMP_KEY = '_COMPANY';
    CONST STORE_COMP_TO_KEY = '_COMPANIES_TO';
    CONST STORE_COMP_SETTINGS = '_COMPANIES_SETTINGS';
    CONST STORE_SUBSCRIPTION_KEY = '_SUBSCRIPTION';
    CONST STORE_SVG_KEY = '_SVG_ICONS';


    private $module;

    public $enabled = true;
    public $installed = false;
    public $prefix = 'APC';

    private $bApcu = false;
    private $expire = array();
    private $expireTime = 2592000; // 60*60*24*30 ~ 1 month

    CONST APC_KEY = 'APC_DISABLED';
    CONST APC_MIN = 60;
    CONST APC_HOUR = 3600;

    /**
     * Class constructor
     */
    public function __construct() {

        if(defined('APC_PREFIX'))
            $this->prefix = APC_PREFIX;
        $this->module = new cApcModule($this->prefix);

        // Check if extension loaded & enabled - either of one
        $this->installed = extension_loaded('apc') && ini_get('apc.enabled');
        if(!$this->installed){
            $this->bApcu = true;
            $this->installed = extension_loaded('apcu') && ini_get('apc.enabled');
        }

        if($this->installed){
            $this->expire = $this->module->getExpirationTimes();
            // Check if APC manually not disabled
            if(isset($this->expire[$this->prefix . self::APC_KEY]))
                $this->enabled = false;
        }else{
            $this->enabled = false;
        }
    }

    /**
     * Function to check if data exits in cache storage and return data
     *
     * @author Mareks Keišs <mareks.keiss@brsystems.lv>
     * @category LIB APC
     * @param string $key - cache key
     * @param bool $force - force cache check when installed
     * @return mixed data
     */
    public function check($key, $force = false){
        if($key && $this->enabled){
            $key = $this->prefix . $key;
            if(isset($this->expire[$key]) || $this->installed && $force){
                $data = ($this->bApcu ? apcu_fetch($key) : apc_fetch($key));
                if(!!$data)
                    return $data;
            }
        }
        return false;
    }

    /**
     * Function to check if data exits in cache storage
     *
     * @author Mareks Keišs <mareks.keiss@brsystems.lv>
     * @category LIB APC
     * @param string $key - cache key
     * @return bool true / false
     */
    public function exists($key){
        if($key && $this->enabled){
            $key = $this->prefix . $key;
            if(isset($this->expire[$key])){
                return ($this->bApcu ? apcu_exists($key) : apc_exists($key));
            }
        }

        return false;
    }

    /**
     * Function to replace & store apc cache data
     *
     * @author Mareks Keišs <mareks.keiss@brsystems.lv>
     * @category LIB APC
     * @param string $key - cache key
     * @param mixed $data - cache data
     * @param int|bool $ttl - time to live s
     * @return bool true / false
     */
    public function store($key, $data, $ttl = false){
        if($this->enabled && $key){
            $sFullKey = $this->prefix . $key;
            $bStatus = ($this->bApcu ? apcu_store($sFullKey, $data) : apc_store($sFullKey, $data));

            if($bStatus){
                if(!isset($this->expire[$sFullKey]))
                    $this->expire[$sFullKey] = $sFullKey;
                $this->module->addKey($key, ($ttl?$ttl:$this->expireTime));
            }
        }

        return false;
    }

    /**
     * Function to mark data as expired
     *
     * @author Mareks Keišs <mareks.keiss@brsystems.lv>
     * @category LIB APC
     * @param string|array $key - cache key / key array
     * @return bool true / false
     */
    public function setExpired($key): bool
    {
        if (!is_array($key)) {
            $key = [$key];
        }
        $this->module->dropKey($key);

        return false;
    }

    /**
     * Function to mark data as expired for keys starting like sth
     *
     * @author Mareks Keišs <mareks.keiss@brsystems.lv>
     * @category LIB APC
     * @param string|array $key - cache key / key array
     * @return bool true / false
     */
    public function setExpiredStartingWith($key){

        if(!is_array($key))
            $key = array($key);
        $this->module->dropKeyLike($key);

        return false;

    }

    /**
     * Function to mark data as expired for keys starting like sth
     *
     * @author Mareks Keišs <mareks.keiss@brsystems.lv>
     * @category LIB APC
     * @param string|array $keys - cache key / key array
     * @return bool true / false
     */
    public function setExpiredContaining($keys){

        if(!is_array($keys))
            $keys = array($keys);
        $this->module->dropKeyContaining($keys);

        return false;

    }

    /**
     * Function to cleanup all data
     *
     * @author Mareks Keišs <mareks.keiss@brsystems.lv>
     * @category LIB APC
     * @return bool true / false
     */
    public function cleanup(){

        return $this->module->cleanup();

    }

    /**
     * Function to enable / disable apc cache from administration
     *
     * @author Mareks Keišs <mareks.keiss@brsystems.lv>
     * @category LIB APC
     * @param bool $status - true / false
     * @return bool true / false
     */
    public function enabled($status = true){
        if($status)
            $this->setExpired(self::APC_KEY);
        else
            if($this->installed)
                $this->store(self::APC_KEY, true, 60*60*24*365);
        return $this->installed;
    }

    /**
     * Function to get apc / apcu cache user data
     *
     * @author Mareks Keišs <mareks.keiss@brsystems.lv>
     * @category LIB APC
     * @return mixed
     */
    public function getUserCacheData(){

        return ($this->bApcu ? apcu_cache_info() : apc_cache_info('user'));
    }

    /**
     * Function to clear apc cache
     *
     * @author Mareks Keišs <mareks.keiss@brsystems.lv>
     * @category LIB APC
     * @return void
     */
    public function clearCache(){
        if($this->installed){
            if($this->bApcu){
                apcu_clear_cache();
            }else{
                apc_clear_cache();
                apc_clear_cache('user');
            }
        }
    }
}