<?php
/**
 * @copyright Copyright (c) 2016 Bjoern Schiessle <bjoern@schiessle.org>
 *
 * @license GNU AGPL version 3 or any later version
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */


namespace OCA\ServerInfo;

use bantu\IniGetWrapper\IniGetWrapper;

/**
 * Class php
 *
 * @package OCA\Survey_Client\Categories
 */
class PhpStatistics {

	/** @var IniGetWrapper */
	protected $phpIni;

	/**
	 * @param IniGetWrapper $phpIni
	 */
	public function __construct(IniGetWrapper $phpIni) {
		$this->phpIni = $phpIni;
	}

	public function getPhpStatistics() {
		return [
			'version' => $this->cleanVersion(PHP_VERSION),
			'memory_limit' => $this->phpIni->getBytes('memory_limit'),
			'max_execution_time' => $this->phpIni->getNumeric('max_execution_time'),
			'upload_max_filesize' => $this->phpIni->getBytes('upload_max_filesize'),
			'opcache' => $this->getOPcacheStatus(),
			'apcu' => $this->getAPCuStatus(),
		];
	}

	/**
	 * Try to strip away additional information
	 *
	 * @param string $version E.g. `5.5.30-1+deb.sury.org~trusty+1`
	 * @return string `5.5.30`
	 */
	protected function cleanVersion($version) {
		$matches = [];
		preg_match('/^(\d+)(\.\d+)(\.\d+)/', $version, $matches);
		if (isset($matches[0])) {
			return $matches[0];
		}
		return $version;
	}

	/**
	 * Get status information about the cache from the OPcache extension
	 *
	 * @return array with an array of state information about the cache instance
	 */
	protected function getOPcacheStatus(): array {
		// Test if the OPcache module is installed
		if (!extension_loaded('Zend OPcache')) {
			// module not loaded, returning back empty array to prevent any errors on JS side.
			return [];
		}

		// get status information about the cache
		$status = opcache_get_status(false);

		if ($status === false) {
			// no array, returning back empty array to prevent any errors on JS side.
			$status = [];
		}

		return $status;
	}

	/**
	 * Get status information about the cache from the APCu extension
	 *
	 * @return array with an array of state information about the cache instance
	 */
	protected function getAPCuStatus(): array {
		// Test if the APCu module is installed
		if (!extension_loaded('apcu')) {
			// module not loaded, returning back empty array to prevent any errors on JS side.
			return [];
		}

		// get cached information from APCu data store
		$cacheInfo = apcu_cache_info(true);

		// get APCu Shared Memory Allocation information
		$smaInfo = apcu_sma_info(true);

		if ($cacheInfo === false) {
			// no array, returning back N/A to prevent any errors on JS side.
			$cacheInfo = 'N/A';
		}

		if ($smaInfo === false) {
			// no array, returning back N/A to prevent any errors on JS side.
			$smaInfo = 'N/A';
		}

		// return the array
		return [
			'cache' => $cacheInfo,
			'sma' => $smaInfo,
		];
	}
}