<?php
/**
 * Hilfsklasse zum Auslesen der Umgebungsvariablen, die in einer .htaccess gesetzt sind
 *
 * @author Christian Steinle
 * @date 02.08.2016
 *
 * @copyright CS medien- & kommunikationssysteme (http://www.steinle-computer.de)
 */

namespace Helper;
use Singleton\SingletonAbstract;


class Environment extends SingletonAbstract
{
	/**
	 * @var string
	 */
	protected static $_environment = '';


	/**
	 * @return Environment|null
	 */
	public static function getInstance()
	{
		if (null === self::$_instance)
		{
			self::$_instance = new self;
			self::setEnvironment();
		}
		return self::$_instance;
	}


	/**
	 * Falls ein Skript via Apache gestartet wird, zieht getenv.
	 * Andernfalls werden die Informationen aus einer .htaccess im FileSystem ausgelesen.
	 */
	protected static function setEnvironment()
	{
		$environment = getenv('ENVIRONMENT');
		if ($environment === false)
		{
			$tmpPath = __DIR__;
			while ($tmpPath != '/')
			{
				$htFile = $tmpPath . '/.htaccess';
				if (is_file($htFile) && is_readable($htFile))
				{
					$htContent = file($htFile);
					foreach ($htContent as $line => $text)
					{
						if (strpos($text, 'SetEnv') !== false && strpos($text, 'ENVIRONMENT') !== false)
						{
							self::$_environment = trim(str_replace(array('SetEnv', 'ENVIRONMENT'), '', $text));
							exit();
						}
					}
				}
				$tmpPath = dirname($tmpPath);
			}
			$environment = '';
		}
		self::$_environment = $environment;
	}


	/**
	 * @return string
	 */
	public static function getEnvironment()
	{
		return self::$_environment;
	}
}