class Environment
{
	/**
	 *
	 */
	const PRODUCTION = 10;
	/**
	 *
	 */
	const STAGING = 20;
	/**
	 *
	 */
	const TESTING = 30;
	/**
	 *
	 */
	const DEVELOPMENT = 40;

	/**
	 * @var int
	 */
	protected static $current;

	/**
	 * @var
	 */
	private static $currentObj;

	/**
	 *
	 */
	public static function instance()
	{
		if(!self::$currentObj)
		{
			self::$currentObj = new self();
		}
		return self::$currentObj;
	}

	/**
	 * @param int $ENV
	 * @return bool
	 */
	public function set($ENV = Environment::DEVELOPMENT)
	{
		if(self::$current)
		{
			return false;
		}

		if(isset($_GET['DEBUG']))
		{
			$this->setEnvironment($_GET['DEBUG']);

			$_SESSION['systemEnvironment'] = $_GET['DEBUG'];

		}
		elseif(isset($_SESSION['systemEnvironment']) and $_SESSION['systemEnvironment'] !== 'off')
		{
			$this->setEnvironment($_SESSION['systemEnvironment']);

		}
		else
		{
			self::$current = $ENV;

		}
		return true;
	}


	/**
	 * @return int
	 */
	public static function getCurrent()
	{
		return self::$current;
	}


	/**
	 * @param $level
	 */
	private function setEnvironment($level)
	{
		switch($level)
		{
			case 'PRODUCTION':
				self::$current = self::PRODUCTION;
				break;
			case 'STAGING':
				self::$current = self::STAGING;
				break;
			case 'TESTING':
				self::$current = self::TESTING;
				break;
			case 'DEVELOPMENT':
				self::$current = self::DEVELOPMENT;
				break;
			case 'off':
				if(isset($_SERVER['ENVIRONMENT']))
				{
					self::$current = constant('Environment::' . strtoupper($_SERVER['ENVIRONMENT']));
				}
				$_SESSION['systemEnvironment'] = null;
				break;

		}
	}

}


/**
 * Class EnvironmentUtils
 */
class EnvironmentUtils extends Environment
{
	/**
	 * @param $rootDirectory
	 * @param $fileName
	 * @return string
	 */
	public static function getConfigFile($rootDirectory, $fileName)
	{
		$fileLink = $rootDirectory . '/config/';
		switch(parent::$current)
		{
			case Environment::DEVELOPMENT:
				$fileLink .= 'Development/';
				break;
			case Environment::PRODUCTION:
				$fileLink .= 'Production/';
				break;
			case Environment::STAGING:
				$fileLink .= 'Staging/';
				break;
			case Environment::TESTING:
				$fileLink .= 'Testing/';
				break;

		}
		return $fileLink . $fileName;
	}
}

define("PROTECTED_PATH",realpath(dirname(__FILE__)).'/protected/');
if(!file_exists(PROTECTED_PATH.'vendor/autoload.php'))
{
	die('autoload.php not found. Composer update!');
}

require_once(PROTECTED_PATH.'vendor/autoload.php');
require_once(PROTECTED_PATH.'environment.php');

if(isset($_SERVER['HTTP_ORIGIN']))
{
	if(in_array($_SERVER['HTTP_ORIGIN'],[....]))
	{
	      header('Access-Control-Allow-Origin: '.$_SERVER['HTTP_ORIGIN']);
	      header('Access-Control-Allow-Methods: GET, POST, OPTIONS, DELETE, PUT');
	      header('Access-Control-Max-Age: 1728000');
	      header('Access-Control-Allow-Credentials: true');
	      header("Access-Control-Allow-Headers: access-token, expiry, token-type, uid, client");
	      header("Access-Control-Expose-Headers: access-token, expiry, token-type, uid, client");
	}	
}


if($_SERVER['REQUEST_METHOD'] == 'OPTIONS')
{
	header("HTTP/1.0 204 No Content");
	die();
}

Environment::instance()->set(Environment::DEVELOPMENT);

switch(Environment::getCurrent())
{
	case Environment::DEVELOPMENT:

		define('YII_DEBUG', false);
		define('YII_SKIP_AUTH', true);
		define('YII_KERNEL_LOG', true);
		define('DISPLAY_ERROR_TRACE', true);
		define('YII_TRACE_LEVEL', 0);
		define('MINIFY_INTERFACE', false);

		error_reporting(E_ALL);
		ini_set('display_errors','On');
		break;
	case Environment::PRODUCTION:

		define('YII_DEBUG', false);
		define('YII_SKIP_AUTH', false);
		define('YII_KERNEL_LOG', false);
		define('DISPLAY_ERROR_TRACE', false);
		define('YII_TRACE_LEVEL', 3);
		define('MINIFY_INTERFACE', true);

		error_reporting(0);
		ini_set('display_errors','Off');
		break;
	case Environment::STAGING:

		define('YII_DEBUG', true);
		define('YII_SKIP_AUTH', false);
		define('YII_KERNEL_LOG', true);
		define('DISPLAY_ERROR_TRACE', true);
		define('YII_TRACE_LEVEL', 0);

		error_reporting(E_ALL);
		ini_set('display_errors','On');
		break;
}

/** @noinspection PhpUndefinedClassInspection */
Yii::$enableIncludePath = true; //For init Yii kernel
$config = EnvironmentUtils::getConfigFile(PROTECTED_PATH,'Web.php');

//Other constants
define('DATE_FORMAT', 'Y/m/d');
define('STATUS_NOACTIVE', 0);
define('STATUS_ACTIVE', 1);
date_default_timezone_set("Europe/Kiev");

/** @noinspection PhpUndefinedClassInspection */
Yii::createWebApplication($config)->run();