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<?php
/**
 * @author: stev leibelt <artodeto@bazzline.net>
 * @since: 2014-07-27
 */

namespace Net\Bazzline\Component\MemoryLimitManager;

/**
 * Class MemoryLimitManager
 * @package Net\Bazzline\Component\Fork
 */
class MemoryLimitManager
{
    /**
     * @var int
     */
    private $bufferInBytes;

    /**
     * @var int
     */
    private $limitFromIniInBytes;

    /**
     * @var int
     */
    private $limitInBytes;

    public function __construct()
    {
        $currentMemoryLimitFromIni = trim(ini_get('memory_limit'));

        if (((int) $currentMemoryLimitFromIni) > 0) {
            $unitIdentifier = strtolower($currentMemoryLimitFromIni[strlen($currentMemoryLimitFromIni)-1]);
            $value = (int) substr($currentMemoryLimitFromIni, 0, -1);

            switch ($unitIdentifier) {
                case 'g':
                    $this->limitFromIniInBytes = ($this->gigaBytesInBytes($value));
                    break;
                case 'm':
                    $this->limitFromIniInBytes = ($this->megaBytesInBytes($value));
                    break;
                case 'k':
                    $this->limitFromIniInBytes = ($this->kiloBytesInBytes($value));
                    break;
                default:
                    $this->limitFromIniInBytes = $value;
            }
        } else {
            $this->limitFromIniInBytes = 0;
        }

        $this->limitInBytes = $this->limitFromIniInBytes;
    }

    /**
     * @param int $bytes
     */
    public function setBufferInBytes($bytes)
    {
        $this->bufferInBytes = (int) $bytes;
    }

    /**
     * @param int $kiloBytes
     */
    public function setBufferInKiloBytes($kiloBytes)
    {
        $this->setBufferInBytes($this->kiloBytesInBytes($kiloBytes));
    }

    /**
     * @param int $megaBytes
     */
    public function setBufferInMegaBytes($megaBytes)
    {
        $this->setBufferInBytes($this->megaBytesInBytes($megaBytes));
    }

    /**
     * @param int $gigaBytes
     */
    public function setBufferInGigaBytes($gigaBytes)
    {
        $this->setBufferInBytes($this->gigaBytesInBytes($gigaBytes));
    }

    /**
     * @return int
     */
    public function getBufferInBytes()
    {
        return $this->bufferInBytes;
    }

    /**
     * @return int
     */
    public function getBufferInKiloBytes()
    {
        return $this->bytesInKiloBytes($this->bufferInBytes);
    }

    /**
     * @return int
     */
    public function getBufferInMegaBytes()
    {
        return $this->bytesInMegaBytes($this->bufferInBytes);
    }

    /**
     * @return int
     */
    public function getBufferInGigaBytes()
    {
        return $this->bytesInGigaBytes($this->bufferInBytes);
    }

    /**
     * @param int $bytes
     * @throws InvalidArgumentException
     */
    public function setLimitInBytes($bytes)
    {
        if ($this->limitFromIniInBytes > 0) {
            if ($bytes > $this->limitFromIniInBytes) {
                throw new InvalidArgumentException(
                    'provided limit (' . $bytes .
                    ') is above ini limit (' .
                    $this->limitFromIniInBytes . ')',
                    1
                );
            }
        }

        $this->limitInBytes = (int) $bytes;
    }

    /**
     * @param int $kiloBytes
     * @throws InvalidArgumentException
     */
    public function setLimitInKiloBytes($kiloBytes)
    {
        $this->setLimitInBytes($this->kiloBytesInBytes($kiloBytes));
    }

    /**
     * @param int $megaBytes
     * @throws InvalidArgumentException
     */
    public function setLimitInMegaBytes($megaBytes)
    {
        $this->setLimitInBytes($this->megaBytesInBytes($megaBytes));
    }

    /**
     * @param int $gigaBytes
     * @throws InvalidArgumentException
     */
    public function setLimitInGigaBytes($gigaBytes)
    {
        $this->setLimitInBytes($this->gigaBytesInBytes($gigaBytes));
    }

    /**
     * @return int
     */
    public function getLimitInBytes()
    {
        return $this->limitInBytes;
    }

    /**
     * @return int
     */
    public function getLimitInKiloBytes()
    {
        return $this->bytesInKiloBytes($this->limitInBytes);
    }

    /**
     * @return int
     */
    public function getLimitInMegaBytes()
    {
        return $this->bytesInMegaBytes($this->limitInBytes);
    }

    /**
     * @return int
     */
    public function getLimitInGigaBytes()
    {
        return $this->bytesInGigaBytes($this->limitInBytes);
    }

    /**
     * @param array $processIds
     * @return int
     */
    public function getCurrentUsageInBytes(array $processIds = array())
    {
        $currentUsageInBytes = memory_get_usage(true);

        foreach ($processIds as $processId) {
            $return = 0;
            exec('ps -p ' . $processId . '  --no-headers -o rss', $return);

            if (isset($return[0])) {
                //non-swapped physical memory in kilo bytes
                $usageInBytes = (int) $return[0];
                $currentUsageInBytes += ($usageInBytes * 1024);
            }
        }

        return $currentUsageInBytes;
    }

    /**
     * @param array $processIds
     * @return int
     */
    public function getCurrentUsageInKiloBytes(array $processIds = array())
    {
        return $this->bytesInKiloBytes($this->getCurrentUsageInBytes($processIds));
    }

    /**
     * @param array $processIds
     * @return int
     */
    public function getCurrentUsageInMegaBytes(array $processIds = array())
    {
        return $this->bytesInMegaBytes($this->getCurrentUsageInBytes($processIds));
    }

    /**
     * @param array $processIds
     * @return int
     */
    public function getCurrentUsageInGigaBytes(array $processIds = array())
    {
        return $this->bytesInGigaBytes($this->getCurrentUsageInBytes($processIds));
    }

    /**
     * @param array $processIds
     * @return bool
     */
    public function isLimitReached(array $processIds = array())
    {
        $currentUsageInBytes = $this->getCurrentUsageInBytes($processIds);
        $currentUsageWithBufferInBytes = $currentUsageInBytes + $this->bufferInBytes;

        $isReached = ($currentUsageWithBufferInBytes >= $this->limitInBytes);

        return $isReached;
    }

    /**
     * @param int $bytes
     * @return int
     */
    private function bytesInKiloBytes($bytes)
    {
        return ((int) ($bytes / 1024));
    }

    /**
     * @param int $bytes
     * @return int
     */
    private function bytesInMegaBytes($bytes)
    {
        return ((int) ($bytes / 1048576));  //1048576 = 1024 * 1024
    }

    /**
     * @param int $bytes
     * @return int
     */
    private function bytesInGigaBytes($bytes)
    {
        return ((int) ($bytes / 1073741824));   //1073741824 = 1024 * 1024 * 1024
    }

    /**
     * @param int $kiloBytes
     * @return int
     */
    private function kiloBytesInBytes($kiloBytes)
    {
        return ((int) ($kiloBytes * 1024));
    }

    /**
     * @param int $megaBytes
     * @return int
     */
    private function megaBytesInBytes($megaBytes)
    {
        return ((int) ($megaBytes * 1048576));  //1048576 = 1024 * 1024
    }

    /**
     * @param int $gigaBytes
     * @return int
     */
    private function gigaBytesInBytes($gigaBytes)
    {
        return ((int) ($gigaBytes * 1073741824)); //1073741824 = 1024 * 1024 * 1024
    }
}