<?php
	$HTML = new HTML();
	$HTML->setHTMLTitle("Login");
	$HTML->importHTML("login.html");

	if($_SERVER['REQUEST_METHOD'] == 'POST')
	{
		include_once 'app/FormValidator.php';
		$validator = new FormValidator(array(
			'username' => array('required' => true, 'regex' => '/^[^\\/<>\s]{1,64} [^\\/<>\s]{1,64}$/'),
			'password' => array('required' => true, 'regex' => '/^.{1,1000}$/')
		));
		
		if(!$validator->isValid($_POST)) {
			$HTML->ReplaceLayoutInhalt("%%LOGINMESSAGE%%", "Bitte gebe Benutzername (Vor- und Nachname) und Passwort ein.");
		}
		else {
			$statementUser = $RUNTIME['PDO']->prepare("SELECT PrincipalID,FirstName,LastName,Email,UserLevel,passwordHash,passwordSalt FROM UserAccounts JOIN auth ON UserAccounts.PrincipalID = auth.UUID WHERE FirstName = ? AND LastName = ? LIMIT 1");
			$statementUser->execute(explode(" ", trim($_POST['username'])));
			$res = ['passwordHash' => '', 'passwordSalt' => ''];

			if($rowUser = $statementUser->fetch()) {
				$res = $rowUser;
			}

			if(hash_equals(md5(md5($_POST['password']).":".$res['passwordSalt']), $res['passwordHash'])) {
				session_unset(); // Unset pre-session variables, next request will generate a new CSRF token
				$_SESSION['FIRSTNAME'] = $rowUser['FirstName'];
				$_SESSION['LASTNAME'] = $rowUser['LastName'];
				$_SESSION['EMAIL'] = $rowUser['Email'];
				$_SESSION['PASSWORD'] = $rowUser['passwordHash'];
				$_SESSION['SALT'] = $rowUser['passwordSalt'];
				$_SESSION['UUID'] = $rowUser['PrincipalID'];
				$_SESSION['LEVEL'] = $rowUser['UserLevel'];
				$_SESSION['DISPLAYNAME'] = strtoupper($rowUser['FirstName'].' '.$rowUser['LastName']);
				$_SESSION['LOGIN'] = 'true';

				header("Location: index.php?page=dashboard");
				die();
			}

			$HTML->ReplaceLayoutInhalt("%%LOGINMESSAGE%%", "Benutzername und/oder Passwort falsch.");
			$HTML->ReplaceLayoutInhalt("%%LASTUSERNAME%%", htmlspecialchars($_POST['username']));
		}
	}
	else if(isset($_SESSION) && isset($_SESSION['loginMessage'])) {
		$HTML->ReplaceLayoutInhalt('%%LOGINMESSAGE%%', $_SESSION['loginMessage']);
		$HTML->ReplaceLayoutInhalt('%%MESSAGECOLOR%%', $_SESSION['loginMessageColor']);
		unset($_SESSION['loginMessage']);
		unset($_SESSION['loginMessageColor']);
	}

	$HTML->ReplaceLayoutInhalt("%%LOGINMESSAGE%%", ""); 
	$HTML->ReplaceLayoutInhalt("%%MESSAGECOLOR%%", "red");
	$HTML->ReplaceLayoutInhalt("%%LASTUSERNAME%%", ""); 

	$HTML->build();
	echo $HTML->ausgabe();
?>