<?php

namespace Vn\Web;

require_once ('vn/lib/app.php');

/**
 * Main class for web applications.
 *
 * Format for $_REQUEST['srv'] variable:
 *  - [serviceName]:[requestDir]/[requestFile]
 **/
class App extends \Vn\Lib\App
{
	protected $conn = NULL;
	private $allowedServices =
	[
		'html',
		'rest',
		'json'
	];

	function run ()
	{
		$this->init ();
		
		$srv = empty ($_REQUEST['srv']) ? '' : $_REQUEST['srv'];
		$explode = explode (':', $srv, 2);

		if (count ($explode) > 0)
			$_REQUEST['service'] = $explode[0];			
		if (count ($explode) > 1)
			$_REQUEST['method'] = $explode[1];

		$service = empty ($_REQUEST['service']) ? 'html' : $_REQUEST['service'];

		if (in_array ($service, $this->allowedServices, TRUE))
		{
			$includeFile = __DIR__."/$service-service.php";
			require_once ($includeFile);

			$className = __NAMESPACE__ .'\\'. hyphenToCamelCase ($service, TRUE) .'Service';
			$service = new $className ($this);
			$service->run ();
		}
		else
			http_response_code (400);
	}

	/**
	 * Gets the configuration file name associated to the current vhost
	 * or the default config file if isn't defined a file for the vhost.
	 **/
	function getConfigFile ()
	{
		if (!empty ($_SERVER['SERVER_NAME'])
		&& preg_match ('/^[\w\-\.]+$/', $_SERVER['SERVER_NAME']))
		{
			$hostSplit = explode ('.', $_SERVER['SERVER_NAME']);
			$configDir = _CONFIG_DIR .'/'. $this->name;
			$hostFile = $configDir .'/config.'. $hostSplit[0] .'.php';
		}

		if (isset ($hostFile) && file_exists ($hostFile))
			return $hostFile;
		else
			return parent::getConfigFile ();
	}
	
	/**
	 * Tries to retrieve user credentials from many sources such as POST,
	 * SESSION or COOKIES. If $_POST['remember'] is defined the user credentials 
	 * are saved on the client brownser for future logins, cookies names are
	 * 'vn_user' for the user name and 'vn_pass' for user password, the
	 * password is encoded using base64_encode() function and should be decoded
	 * using base64_decode().
	 *
	 * return Db\Conn The database connection
	 **/
	function login ()
	{
		if ($this->conn)
			return $this->conn;
	
		$user = NULL;
		$password = NULL;
		$rememberUser = TRUE;
		$rememberPass = FALSE;
		$credentialsChanged = TRUE;
		$wasLoged = isset ($_SESSION['user']);
		
		if (isset ($_POST['guest']))
		{
			$sysConn = $this->getSysConn ();
			$row = $sysConn->getRow (
				'SELECT guest_user, guest_pass FROM config');

			if ($row)
			{
				$user = $row['guest_user'];
				$password = base64_decode ($row['guest_pass']);
				$rememberUser = FALSE;
			}
		}
		elseif (isset ($_POST['user']) && isset ($_POST['password']))
		{
			$user = $_POST['user'];
			$password = $_POST['password'];

			if (isset ($_POST['remember']) && $_POST['remember'])
				$rememberPass = TRUE;
		}
		elseif (isset ($_SESSION['user']))
		{
			$user = $_SESSION['user'];
			$password = $_SESSION['password'];
			$credentialsChanged = FALSE;
		}
		elseif (isset ($_COOKIE['vn_user']) && isset ($_COOKIE['vn_pass']))
		{
			$user = $_COOKIE['vn_user'];
			$password = base64_decode ($_COOKIE['vn_pass']);
			$rememberPass = TRUE;
		}

		if (!isset ($user))
			throw new SessionExpiredException ();

		try {
			$db = $this->createConnection ($user, $password);
			$db->query ('CALL user_session_start (#)', [session_id ()]);
			$this->conn = $db;

			if ($rememberUser)
			{
				$cookieLife = time () + 7 * 86400; // 7 Days
				setcookie ('vn_user', $user, $cookieLife);

				if ($rememberPass)
					setcookie ('vn_pass',
						base64_encode ($password), $cookieLife);
			}

			$_SESSION['user'] = $user;
			$_SESSION['password'] = $password;
		}
		catch (\Exception $e)
		{
			$this->conn = NULL;
			throw new BadLoginException ();
		}

		// Registering the user access

		if (!$wasLoged)
			unset ($_SESSION['visitUser']);

		if (isset ($_SESSION['access'])
		&& !isset ($_SESSION['visitUser']))
		{
			$sysConn = $this->getSysConn ();
			$_SESSION['visitUser'] = $sysConn->getValue (
				'CALL visit_user_new (#, #, #)',
				[
					 $_SESSION['access']
					,nullIf ($_SESSION, 'visitUser')
					,session_id ()
				]
			);
	
			if (!isset ($_SESSION['visitUnknown']))
				$_SESSION['visitUnknown'] = $_SESSION['visitUser'];
		}
		
		return $db;
	}

	/**
	 * Logouts the current user. Cleans the last saved used credentials.
	 **/
	function logout ()
	{
		$_SESSION['visitUser'] = nullIf ($_SESSION, 'visitUnknown');
		
		setcookie ('vn_pass', '', -1);
		unset ($_COOKIE['vn_pass']);
		unset ($_SESSION['user']);
		unset ($_SESSION['password']);
		
		if ($this->conn)
		{
			$this->conn->query (
				'DELETE FROM user_session_view '
				 .'WHERE connection_id = CONNECTION_ID()'
			);
			$this->conn->close ();
			$this->conn = NULL;
		}
	}
}

?>