<?php
/**
 * @author Open Mind
 * @date 26/04/2018
 * @time 11:11
 */

namespace OpenMind\System;

use Exception;
use FilesystemIterator;
use Log;
use OpenMind\Web\Web;
use RecursiveDirectoryIterator;
use RecursiveIteratorIterator;
use Template;

class OMUtils
{

	private $Logger;

	public function __construct()
	{
		$this->Logger = new Log('Site.log');
	}

	/**
	 * The Singleton Instance
	 *
	 * @return null|OMUtils
	 */
	public static function getInstance(): ?OMUtils
	{
		static $instance = null;
		if ($instance === null) {
			$instance = new static(); // PHP 5+ lazy state building
		}
		return $instance;
	}

	/**
	 * Get logger classe
	 *
	 * @return Log
	 */
	public function getLogger(): Log
	{
		return $this->Logger;
	}

	/**
	 * Load all modules in <$path> folder
	 * @param string $path
	 */
	public function PluginLoader(string $path)
	{
		// <class priority>
		// TODO if is necessary to give a priority to some classes before other, initialize here
		Global $System, $Web;
		$System = new System();  // we need System Base class first, so will force to load as first
		$Web = new Web();
		// </class priority>
		$Directory = new RecursiveDirectoryIterator($path, FilesystemIterator::SKIP_DOTS);
		$Iterator = new RecursiveIteratorIterator($Directory, RecursiveIteratorIterator::CHILD_FIRST);

		foreach($Iterator as $item) {
			if (is_file($item->getPathname()))
				continue;
			$moduleName = $item->getFilename();
			$className = str_replace('/', '\\', ltrim("{$item->getPathname()}/{$moduleName}", $path));
			// Load only PHP file with same name of namespace ex.: \Lamborghini\Lamborghini.php
			$moduleInitPath = "{$item->getPathname()}/{$moduleName}.php";
			if (file_exists($moduleInitPath)) { // If already imported, skip
				if (!isset($$moduleName)) {
					$$moduleName = new $className(); // Instantiate the Module, all init procedure must reside in __constructor() method
					$$moduleName->setTsStartLoad();
				}
			}
		}
	}

	/**
	 * Use F3 template resolve() to parse string like "{{@BASESITE}}"
	 *
	 * @param string $strTemplate the F3 original string
	 * @return string converted string
	 */
	public function getStringFromTemplate(string $strTemplate)
	{
		return Template::instance()->resolve($strTemplate);
	}


	/**
	 * Load an encrypted file with the method "base64_encode(gzcompress(<path to config.ini>))", save it in a temporary file in temp folder of system and load with F3::config()
	 *
	 * @param string $path
	 * @throws Exception
	 */
	public function LoadEncryptedConfig(string $path)
	{
		global $f3;
		if (!file_exists($path))
			throw new Exception('Config file not found');

		$tmpFilepath = tempnam(sys_get_temp_dir(), 'om');
		$config = $this->Decrypt(file_get_contents($path));
		file_put_contents($tmpFilepath, $config);
		$f3->config($tmpFilepath, true);
		unlink($tmpFilepath);
	}

	/**
	 * Decrypt $data using OM-Link algorithm
	 *
	 * @param $binaryData
	 * @return string
	 */
	public function Decrypt($binaryData)
	{
		return gzuncompress(base64_decode($binaryData));
	}

	/**
	 * Encrypt $data using OM-Link algorithm
	 *
	 * @param $data
	 * @return string
	 */
	public function Encrypt($data)
	{
		return base64_encode(gzcompress($data));
	}

	/*
	 * Exit from APP if the OMLINK requirement aren't meet
	 */

	public function DieByOldPhpVersion()
	{
		if (version_compare(PHP_VERSION, '7.2') != 1)
			throw new Exception('PHP 7.2+ is need to run the project');
	}

	/**
	 * Check if a port server is opened, return $errno code of fsockopen function
	 *
	 * @param string $ip
	 * @param int $port
	 * @param int $timeout_sec
	 * @return int
	 */
	function isServerAlive(string $ip, int $port, int $timeout_sec = 5): int
	{
		try {
			@fclose($sck = @fsockopen($ip, $port, $errno, $errstr, $timeout_sec));
		} catch (Exception $e) {
			die($e->getMessage());
		}
		return $errno;
	}

	/**
	 * Recurse delete folder
	 *
	 * @param string $dir /path/for/the/directory/
	 */
	function rrmdir($dir)
	{
		if (is_dir($dir)) {
			$files = glob($dir . '*', GLOB_MARK); //GLOB_MARK adds a slash to directories returned

			foreach($files as $file) {
				$this->rrmdir($file);
			}

			@rmdir($dir);
		} elseif (is_file($dir)) {
			@unlink($dir);
		}
	}
}