<?php
/* Copyright (C) 2026      Eduard Wisch    <data@data-it-solution.de>
 *
 * Stundenzettel PWA - Token-basierte Authentifizierung
 */

if (!defined('NOLOGIN')) {
	define('NOLOGIN', '1');
}
if (!defined('NOREQUIREMENU')) {
	define('NOREQUIREMENU', '1');
}
if (!defined('NOREQUIREHTML')) {
	define('NOREQUIREHTML', '1');
}
if (!defined('NOREQUIREAJAX')) {
	define('NOREQUIREAJAX', '1');
}

// Dolibarr-Umgebung laden
$res = 0;
if (!$res && file_exists("../../main.inc.php")) $res = @include "../../main.inc.php";
if (!$res && file_exists("../../../main.inc.php")) $res = @include "../../../main.inc.php";
if (!$res && file_exists("../../../../main.inc.php")) $res = @include "../../../../main.inc.php";
if (!$res) die(json_encode(array('success' => false, 'error' => 'Dolibarr nicht geladen')));

header('Content-Type: application/json; charset=UTF-8');

$action = GETPOST('action', 'aZ09');
$response = array('success' => false);

switch ($action) {
	case 'login':
		$username = GETPOST('username', 'alphanohtml');
		$password = GETPOST('password', 'none');

		if (empty($username) || empty($password)) {
			$response['error'] = 'Benutzername und Passwort erforderlich';
			break;
		}

		// Brute-Force-Schutz
		usleep(100000); // 100ms Verzoegerung

		require_once DOL_DOCUMENT_ROOT.'/user/class/user.class.php';
		$userLogin = new User($db);

		// Benutzer per Login suchen
		$sql = "SELECT rowid FROM ".MAIN_DB_PREFIX."user WHERE login = '".$db->escape($username)."' AND statut = 1";
		$result = $db->query($sql);

		if ($result && $db->num_rows($result) > 0) {
			$obj = $db->fetch_object($result);
			$userLogin->fetch($obj->rowid);
			$userLogin->getrights();

			// Passwort pruefen
			require_once DOL_DOCUMENT_ROOT.'/core/lib/security2.lib.php';

			$passOk = false;
			if (!empty($userLogin->pass_indatabase_crypted)) {
				$passOk = dol_verifyHash($password, $userLogin->pass_indatabase_crypted);
			}

			if ($passOk) {
				// Stundenzettel-Berechtigung pruefen
				if ($userLogin->hasRight('stundenzettel', 'read')) {
					// Token generieren (15 Tage gueltig)
					$tokenData = array(
						'user_id' => $userLogin->id,
						'login' => $userLogin->login,
						'created' => time(),
						'expires' => time() + (15 * 24 * 60 * 60),
						'hash' => md5($userLogin->id . $userLogin->login . getDolGlobalString('MAIN_SECURITY_SALT', 'defaultsalt'))
					);
					$token = base64_encode(json_encode($tokenData));

					$response['success'] = true;
					$response['token'] = $token;
					$response['user'] = array(
						'id' => $userLogin->id,
						'login' => $userLogin->login,
						'name' => $userLogin->getFullName($langs)
					);
				} else {
					$response['error'] = 'Keine Berechtigung fuer Stundenzettel';
				}
			} else {
				$response['error'] = 'Falsches Passwort';
			}
		} else {
			$response['error'] = 'Benutzer nicht gefunden';
		}
		break;

	case 'verify':
		$token = GETPOST('token', 'none');

		if (empty($token)) {
			$response['error'] = 'Kein Token';
			break;
		}

		$tokenData = json_decode(base64_decode($token), true);

		if (!$tokenData || empty($tokenData['user_id']) || empty($tokenData['expires'])) {
			$response['error'] = 'Ungueltiges Token';
			break;
		}

		// Ablaufdatum pruefen
		if ($tokenData['expires'] < time()) {
			$response['error'] = 'Token abgelaufen';
			break;
		}

		// Hash verifizieren
		$expectedHash = md5($tokenData['user_id'] . $tokenData['login'] . getDolGlobalString('MAIN_SECURITY_SALT', 'defaultsalt'));
		if ($tokenData['hash'] !== $expectedHash) {
			$response['error'] = 'Token manipuliert';
			break;
		}

		// Benutzer noch aktiv?
		require_once DOL_DOCUMENT_ROOT.'/user/class/user.class.php';
		$userCheck = new User($db);
		if ($userCheck->fetch($tokenData['user_id']) > 0 && $userCheck->statut == 1) {
			$response['success'] = true;
			$response['user'] = array(
				'id' => $userCheck->id,
				'login' => $userCheck->login,
				'name' => $userCheck->getFullName($langs)
			);
		} else {
			$response['error'] = 'Benutzer nicht mehr aktiv';
		}
		break;

	default:
		$response['error'] = 'Unbekannte Aktion';
}

echo json_encode($response);
$db->close();