<?php
/* Copyright (C) 2026      Eduard Wisch    <data@data-it-solution.de>
 *
 * Stundenzettel PWA - Zentrale JSON-API
 * Alle CRUD-Operationen fuer die Mobile App
 */

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')));

require_once DOL_DOCUMENT_ROOT.'/commande/class/commande.class.php';
require_once DOL_DOCUMENT_ROOT.'/product/class/product.class.php';
require_once DOL_DOCUMENT_ROOT.'/societe/class/societe.class.php';
require_once DOL_DOCUMENT_ROOT.'/user/class/user.class.php';
dol_include_once('/stundenzettel/class/stundenzettel.class.php');

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

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

// ============================================================
// TOKEN-VALIDIERUNG
// ============================================================

$token = GETPOST('token', 'none');

if (empty($token)) {
	http_response_code(401);
	echo json_encode(array('success' => false, 'error' => 'Kein Token'));
	exit;
}

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

if (!$tokenData || empty($tokenData['user_id']) || empty($tokenData['expires'])) {
	http_response_code(401);
	echo json_encode(array('success' => false, 'error' => 'Ungueltiges Token'));
	exit;
}

if ($tokenData['expires'] < time()) {
	http_response_code(401);
	echo json_encode(array('success' => false, 'error' => 'Token abgelaufen'));
	exit;
}

$expectedHash = md5($tokenData['user_id'] . $tokenData['login'] . getDolGlobalString('MAIN_SECURITY_SALT', 'defaultsalt'));
if ($tokenData['hash'] !== $expectedHash) {
	http_response_code(401);
	echo json_encode(array('success' => false, 'error' => 'Token manipuliert'));
	exit;
}

// Benutzer laden
$user = new User($db);
if ($user->fetch($tokenData['user_id']) <= 0 || $user->statut != 1) {
	http_response_code(401);
	echo json_encode(array('success' => false, 'error' => 'Benutzer nicht aktiv'));
	exit;
}
$user->getrights();

// Basis-Berechtigung
if (!$user->hasRight('stundenzettel', 'read')) {
	http_response_code(403);
	echo json_encode(array('success' => false, 'error' => 'Keine Berechtigung'));
	exit;
}

$langs->loadLangs(array("stundenzettel@stundenzettel", "orders", "products"));

// Schreib-Berechtigung pruefen
$canWrite = $user->hasRight('stundenzettel', 'write');
$canWriteAll = $user->hasRight('stundenzettel', 'write', 'all') || $user->admin;
$canReadAll = $user->hasRight('stundenzettel', 'read', 'all') || $user->admin;

/**
 * Hilfsfunktion: Mengen formatieren
 */
function pwaFormatQty($qty) {
	$qty = (float)$qty;
	if ($qty == floor($qty)) {
		return number_format($qty, 0, ',', '.');
	}
	return rtrim(rtrim(number_format($qty, 2, ',', '.'), '0'), ',');
}

/**
 * Hilfsfunktion: Pruefen ob User Schreibzugriff auf STZ hat
 */
function canEditStz($stz, $user, $canWriteAll) {
	if ($stz->status != Stundenzettel::STATUS_DRAFT) return false;
	if ($stz->fk_user_author == $user->id) return true;
	if ($canWriteAll) return true;
	return false;
}

/**
 * Hilfsfunktion: Status-Label zurueckgeben
 */
function getStatusLabel($status) {
	switch ((int)$status) {
		case 0: return 'Entwurf';
		case 1: return 'Freigegeben';
		case 2: return 'Abgerechnet';
		case 9: return 'Storniert';
		default: return 'Unbekannt';
	}
}

// ============================================================
// API ACTIONS
// ============================================================

switch ($action) {

	// ---- Kundensuche ----
	case 'search_customers':
		$term = GETPOST('term', 'alphanohtml');
		if (strlen($term) < 2) {
			$response['error'] = 'Mindestens 2 Zeichen';
			break;
		}

		$sql = "SELECT s.rowid as id, s.nom as name, COUNT(DISTINCT c.rowid) as order_count";
		$sql .= " FROM ".MAIN_DB_PREFIX."societe as s";
		$sql .= " INNER JOIN ".MAIN_DB_PREFIX."commande as c ON c.fk_soc = s.rowid";
		$sql .= " WHERE s.nom LIKE '%".$db->escape($term)."%'";
		$sql .= " AND c.fk_statut = 1"; // Nur validierte (laufende) Auftraege
		$sql .= " AND s.entity IN (".getEntity('societe').")";
		$sql .= " GROUP BY s.rowid, s.nom";
		$sql .= " ORDER BY s.nom ASC";
		$sql .= " LIMIT 20";

		$resql = $db->query($sql);
		$customers = array();
		if ($resql) {
			while ($obj = $db->fetch_object($resql)) {
				$customers[] = array(
					'id' => (int)$obj->id,
					'name' => $obj->name,
					'order_count' => (int)$obj->order_count
				);
			}
		}
		$response['success'] = true;
		$response['customers'] = $customers;
		break;

	// ---- Auftraege eines Kunden ----
	case 'get_customer_orders':
		$customerId = GETPOST('customer_id', 'int');
		if ($customerId <= 0) {
			$response['error'] = 'Keine Kunden-ID';
			break;
		}

		$sql = "SELECT c.rowid as id, c.ref, c.ref_client, c.date_commande, c.fk_statut as status";
		$sql .= " FROM ".MAIN_DB_PREFIX."commande as c";
		$sql .= " WHERE c.fk_soc = ".((int)$customerId);
		$sql .= " AND c.fk_statut = 1"; // Nur validierte (laufende) Auftraege, nicht geliefert/fakturiert
		$sql .= " AND c.entity IN (".getEntity('commande').")";
		$sql .= " ORDER BY c.date_commande DESC, c.rowid DESC";

		$resql = $db->query($sql);
		$orders = array();
		if ($resql) {
			while ($obj = $db->fetch_object($resql)) {
				// Offener Stundenzettel pruefen
				$sqlStz = "SELECT rowid FROM ".MAIN_DB_PREFIX."stundenzettel";
				$sqlStz .= " WHERE fk_commande = ".((int)$obj->id);
				$sqlStz .= " AND status = 0";
				if (!$canReadAll) {
					$sqlStz .= " AND fk_user_author = ".((int)$user->id);
				}
				$sqlStz .= " ORDER BY date_stundenzettel DESC LIMIT 1";
				$resStz = $db->query($sqlStz);
				$hasDraftStz = false;
				$draftStzId = 0;
				if ($resStz && $db->num_rows($resStz) > 0) {
					$objStz = $db->fetch_object($resStz);
					$hasDraftStz = true;
					$draftStzId = (int)$objStz->rowid;
				}

				$orders[] = array(
					'id' => (int)$obj->id,
					'ref' => $obj->ref,
					'ref_client' => $obj->ref_client ?: '',
					'date' => dol_print_date($db->jdate($obj->date_commande), 'day'),
					'status' => (int)$obj->status,
					'has_draft_stz' => $hasDraftStz,
					'draft_stz_id' => $draftStzId
				);
			}
		}
		$response['success'] = true;
		$response['orders'] = $orders;
		break;

	// ---- Komplett-Kontext fuer einen Auftrag ----
	case 'get_order_context':
		$orderId = GETPOST('order_id', 'int');
		$stzId = GETPOST('stz_id', 'int');

		if ($orderId <= 0) {
			$response['error'] = 'Keine Auftrags-ID';
			break;
		}

		// Auftrag laden
		$order = new Commande($db);
		if ($order->fetch($orderId) <= 0) {
			$response['error'] = 'Auftrag nicht gefunden';
			break;
		}

		// Kunde laden
		$customer = new Societe($db);
		$customer->fetch($order->socid);

		// Auftragsdaten
		$response['order'] = array(
			'id' => (int)$order->id,
			'ref' => $order->ref,
			'date' => dol_print_date($order->date_commande, 'day'),
			'customer_name' => $customer->name,
			'customer_id' => (int)$customer->id,
			'status' => (int)$order->statut
		);

		// Stundenzettel finden (per ID oder letzten Draft)
		$stz = new Stundenzettel($db);
		$stzFound = false;

		if ($stzId > 0) {
			if ($stz->fetch($stzId) > 0) {
				$stzFound = true;
			}
		}

		if (!$stzFound) {
			// Letzten Draft fuer diesen Auftrag suchen
			$sqlStz = "SELECT rowid FROM ".MAIN_DB_PREFIX."stundenzettel";
			$sqlStz .= " WHERE fk_commande = ".((int)$orderId);
			if (!$canReadAll) {
				$sqlStz .= " AND fk_user_author = ".((int)$user->id);
			}
			$sqlStz .= " ORDER BY status ASC, date_stundenzettel DESC, rowid DESC";
			$sqlStz .= " LIMIT 1";
			$resStz = $db->query($sqlStz);
			if ($resStz && $db->num_rows($resStz) > 0) {
				$objStz = $db->fetch_object($resStz);
				$stz->fetch($objStz->rowid);
				$stzFound = true;
			}
		}

		// Prüfe ob User den aktuellen STZ editieren kann
		$canEdit = false;
		if ($stzFound) {
			$canEdit = canEditStz($stz, $user, $canWriteAll);
		}
		$response['can_write'] = $canWrite; // Allgemeine Schreibberechtigung
		$response['can_edit_stz'] = $canWrite && $canEdit; // Aktuellen STZ editierbar

		// STZ-Daten
		if ($stzFound) {
			$response['stz'] = array(
				'id' => (int)$stz->id,
				'ref' => $stz->ref,
				'date' => dol_print_date($stz->date_stundenzettel, 'day'),
				'date_iso' => dol_print_date($stz->date_stundenzettel, '%Y-%m-%d'),
				'status' => (int)$stz->status,
				'status_label' => getStatusLabel($stz->status),
				'hourly_rate' => $stz->hourly_rate,
				'fk_user_author' => (int)$stz->fk_user_author
			);

			// Produkte laden
			$stz->fetchProducts();
			$products = array();
			foreach ($stz->products as $p) {
				$products[] = array(
					'id' => (int)$p->rowid,
					'fk_product' => (int)$p->fk_product,
					'fk_commandedet' => (int)$p->fk_commandedet,
					'ref' => $p->product_ref,
					'label' => $p->product_label,
					'description' => strip_tags($p->description),
					'qty_original' => (float)$p->qty_original,
					'qty_done' => (float)$p->qty_done,
					'origin' => $p->origin
				);
			}
			$response['products'] = $products;

			// Leistungen laden
			$stz->fetchLeistungen();
			$leistungen = array();
			foreach ($stz->leistungen as $l) {
				$leistungen[] = array(
					'id' => (int)$l->rowid,
					'date' => dol_print_date($db->jdate($l->date_leistung), 'day'),
					'date_iso' => dol_print_date($db->jdate($l->date_leistung), '%Y-%m-%d'),
					'time_start' => substr($l->time_start, 0, 5),
					'time_end' => substr($l->time_end, 0, 5),
					'duration_minutes' => (int)$l->duration,
					'description' => strip_tags($l->description ?: ''),
					'service_name' => $l->product_label ?: '',
					'fk_product' => (int)$l->fk_product
				);
			}
			$response['leistungen'] = $leistungen;

			// Notizen laden
			$stz->fetchNotes();
			$notes = array();
			foreach ($stz->notes as $n) {
				$notes[] = array(
					'id' => (int)$n->rowid,
					'note' => $n->note,
					'checked' => (int)$n->checked,
					'date' => dol_print_date($db->jdate($n->datec), 'dayhour')
				);
			}
			$response['notes'] = $notes;
		} else {
			$response['stz'] = null;
			$response['products'] = array();
			$response['leistungen'] = array();
			$response['notes'] = array();
		}

		// Tracking-Daten (Lieferauflistung) - Live-Berechnung wie Desktop
		// Auftragspositionen mit Verbaut/Mehraufwand/Entfaellt/Ruecknahme berechnen
		$tracking = array();
		$sqlTrack = "SELECT cd.rowid, cd.fk_product, cd.qty as qty_ordered, cd.description,";
		$sqlTrack .= " p.ref as product_ref, p.label as product_label,";
		// Verbaut (origin order/added)
		$sqlTrack .= " COALESCE((SELECT SUM(sp.qty_done) FROM ".MAIN_DB_PREFIX."stundenzettel_product sp";
		$sqlTrack .= "   JOIN ".MAIN_DB_PREFIX."stundenzettel s ON s.rowid = sp.fk_stundenzettel";
		$sqlTrack .= "   WHERE sp.fk_commandedet = cd.rowid AND sp.origin IN ('order', 'added')), 0) as qty_delivered,";
		// Mehraufwand
		$sqlTrack .= " COALESCE((SELECT SUM(sp2.qty_done) FROM ".MAIN_DB_PREFIX."stundenzettel_product sp2";
		$sqlTrack .= "   JOIN ".MAIN_DB_PREFIX."stundenzettel s2 ON s2.rowid = sp2.fk_stundenzettel";
		$sqlTrack .= "   WHERE sp2.fk_product = cd.fk_product AND cd.fk_product > 0 AND sp2.origin = 'additional' AND s2.fk_commande = ".((int)$orderId)."), 0) as qty_additional,";
		// Entfaellt
		$sqlTrack .= " COALESCE((SELECT SUM(sp3.qty_done) FROM ".MAIN_DB_PREFIX."stundenzettel_product sp3";
		$sqlTrack .= "   JOIN ".MAIN_DB_PREFIX."stundenzettel s3 ON s3.rowid = sp3.fk_stundenzettel";
		$sqlTrack .= "   WHERE sp3.origin = 'omitted' AND s3.fk_commande = ".((int)$orderId);
		$sqlTrack .= "   AND ((sp3.fk_product = cd.fk_product AND cd.fk_product > 0) OR sp3.fk_commandedet = cd.rowid)), 0) as qty_omitted,";
		// Ruecknahmen
		$sqlTrack .= " COALESCE((SELECT SUM(sp4.qty_done) FROM ".MAIN_DB_PREFIX."stundenzettel_product sp4";
		$sqlTrack .= "   JOIN ".MAIN_DB_PREFIX."stundenzettel s4 ON s4.rowid = sp4.fk_stundenzettel";
		$sqlTrack .= "   WHERE sp4.origin = 'returned' AND s4.fk_commande = ".((int)$orderId);
		$sqlTrack .= "   AND ((sp4.fk_product = cd.fk_product AND cd.fk_product > 0) OR sp4.fk_commandedet = cd.rowid)), 0) as qty_returned";
		$sqlTrack .= " FROM ".MAIN_DB_PREFIX."commandedet as cd";
		$sqlTrack .= " LEFT JOIN ".MAIN_DB_PREFIX."product as p ON p.rowid = cd.fk_product";
		$sqlTrack .= " WHERE cd.fk_commande = ".((int)$orderId);
		$sqlTrack .= " AND (cd.fk_product > 0 OR ((cd.fk_product IS NULL OR cd.fk_product = 0) AND cd.description IS NOT NULL AND cd.description != ''))";
		$sqlTrack .= " AND (cd.special_code IS NULL OR cd.special_code = 0)";
		$sqlTrack .= " ORDER BY cd.rang";

		$resTrack = $db->query($sqlTrack);
		if ($resTrack) {
			while ($obj = $db->fetch_object($resTrack)) {
				$qtyAdditional = (float)$obj->qty_additional;
				$qtyOmitted = (float)$obj->qty_omitted;
				$qtyReturned = (float)$obj->qty_returned;
				// Effektiv bestellt = Original + Mehraufwand - Entfaellt - Ruecknahmen
				$effectiveOrdered = $obj->qty_ordered + $qtyAdditional - $qtyOmitted - $qtyReturned;
				// Effektiv verbaut = Verbaut - Ruecknahmen
				$effectiveDelivered = $obj->qty_delivered - $qtyReturned;
				$qtyRemaining = $effectiveOrdered - $effectiveDelivered;

				$label = '';
				if ($obj->product_ref) {
					$label = $obj->product_ref.' - '.$obj->product_label;
				} else {
					$label = strip_tags($obj->description ?: '');
					if (strlen($label) > 80) $label = substr($label, 0, 77).'...';
				}

				$tracking[] = array(
					'ref' => $obj->product_ref ?: '',
					'label' => $label,
					'qty_ordered' => (float)$effectiveOrdered,
					'qty_delivered' => (float)$effectiveDelivered,
					'qty_remaining' => (float)$qtyRemaining,
					'qty_additional' => $qtyAdditional,
					'qty_omitted' => $qtyOmitted,
					'qty_returned' => $qtyReturned
				);
			}
		}
		$response['tracking'] = $tracking;

		// Leistungen/Arbeitsstunden gruppiert nach Service (fuer Lieferauflistung)
		$leistungenSummary = array();
		$sqlLeist = "SELECT COALESCE(l.fk_product, 0) as service_id,";
		$sqlLeist .= " p.ref as service_ref, p.label as service_label,";
		$sqlLeist .= " SUM(l.duration) as total_minutes, COUNT(l.rowid) as entry_count";
		$sqlLeist .= " FROM ".MAIN_DB_PREFIX."stundenzettel_leistung l";
		$sqlLeist .= " JOIN ".MAIN_DB_PREFIX."stundenzettel s ON s.rowid = l.fk_stundenzettel";
		$sqlLeist .= " LEFT JOIN ".MAIN_DB_PREFIX."product p ON p.rowid = l.fk_product";
		$sqlLeist .= " WHERE s.fk_commande = ".((int)$orderId);
		if (!$canReadAll) {
			$sqlLeist .= " AND s.fk_user_author = ".((int)$user->id);
		}
		$sqlLeist .= " GROUP BY COALESCE(l.fk_product, 0), p.ref, p.label";
		$sqlLeist .= " ORDER BY p.ref, p.label";

		$resLeist = $db->query($sqlLeist);
		if ($resLeist) {
			while ($obj = $db->fetch_object($resLeist)) {
				$totalMin = (int)$obj->total_minutes;
				$h = floor($totalMin / 60);
				$m = $totalMin % 60;
				$leistungenSummary[] = array(
					'service_ref' => $obj->service_ref ?: '',
					'service_label' => $obj->service_label ?: 'Nicht zugeordnet',
					'total_minutes' => $totalMin,
					'total_hours' => sprintf('%d:%02d h', $h, $m),
					'entry_count' => (int)$obj->entry_count
				);
			}
		}
		$response['leistungen_summary'] = $leistungenSummary;

		// Einzelne Leistungen aller STZ (fuer Lieferauflistung Detail)
		$leistungenAll = array();
		$sqlLeistAll = "SELECT l.rowid, l.fk_stundenzettel, l.date_leistung, l.time_start, l.time_end,";
		$sqlLeistAll .= " l.duration, l.description, s.ref as stz_ref,";
		$sqlLeistAll .= " p.ref as service_ref, p.label as service_label";
		$sqlLeistAll .= " FROM ".MAIN_DB_PREFIX."stundenzettel_leistung l";
		$sqlLeistAll .= " JOIN ".MAIN_DB_PREFIX."stundenzettel s ON s.rowid = l.fk_stundenzettel";
		$sqlLeistAll .= " LEFT JOIN ".MAIN_DB_PREFIX."product p ON p.rowid = l.fk_product";
		$sqlLeistAll .= " WHERE s.fk_commande = ".((int)$orderId);
		if (!$canReadAll) {
			$sqlLeistAll .= " AND s.fk_user_author = ".((int)$user->id);
		}
		$sqlLeistAll .= " ORDER BY s.date_stundenzettel DESC, l.date_leistung, l.time_start";

		$resLeistAll = $db->query($sqlLeistAll);
		if ($resLeistAll) {
			while ($obj = $db->fetch_object($resLeistAll)) {
				$dur = (int)$obj->duration;
				$h = floor($dur / 60);
				$m = $dur % 60;
				$leistungenAll[] = array(
					'stz_ref' => $obj->stz_ref,
					'date' => dol_print_date($db->jdate($obj->date_leistung), 'day'),
					'time_start' => $obj->time_start ? substr($obj->time_start, 0, 5) : '',
					'time_end' => $obj->time_end ? substr($obj->time_end, 0, 5) : '',
					'duration' => sprintf('%d:%02d h', $h, $m),
					'service' => $obj->service_ref ? $obj->service_ref : '',
					'description' => strip_tags($obj->description ?: '')
				);
			}
		}
		$response['leistungen_all'] = $leistungenAll;

		// Alle STZ fuer diesen Auftrag
		$stzList = array();
		$sqlList = "SELECT s.rowid, s.ref, s.date_stundenzettel, s.status, s.fk_user_author,";
		$sqlList .= " (SELECT COUNT(*) FROM ".MAIN_DB_PREFIX."stundenzettel_leistung WHERE fk_stundenzettel = s.rowid) as leistung_count,";
		$sqlList .= " (SELECT COALESCE(SUM(duration), 0) FROM ".MAIN_DB_PREFIX."stundenzettel_leistung WHERE fk_stundenzettel = s.rowid) as total_minutes,";
		$sqlList .= " (SELECT COUNT(*) FROM ".MAIN_DB_PREFIX."stundenzettel_product WHERE fk_stundenzettel = s.rowid AND origin IN ('order','added')) as product_count";
		$sqlList .= " FROM ".MAIN_DB_PREFIX."stundenzettel as s";
		$sqlList .= " WHERE s.fk_commande = ".((int)$orderId);
		if (!$canReadAll) {
			$sqlList .= " AND s.fk_user_author = ".((int)$user->id);
		}
		$sqlList .= " ORDER BY s.date_stundenzettel DESC, s.rowid DESC";

		$resList = $db->query($sqlList);
		if ($resList) {
			while ($obj = $db->fetch_object($resList)) {
				$totalMin = (int)$obj->total_minutes;
				$h = floor($totalMin / 60);
				$m = $totalMin % 60;
				$totalHours = ($h > 0 ? $h.'h' : '') . ($m > 0 ? ' '.$m.'min' : '');
				if (!$totalHours) $totalHours = '0h';

				$stzList[] = array(
					'id' => (int)$obj->rowid,
					'ref' => $obj->ref,
					'date' => dol_print_date($db->jdate($obj->date_stundenzettel), 'day'),
					'status' => (int)$obj->status,
					'status_label' => getStatusLabel($obj->status),
					'leistung_count' => (int)$obj->leistung_count,
					'total_hours' => trim($totalHours),
					'product_count' => (int)$obj->product_count
				);
			}
		}
		$response['stz_list'] = $stzList;

		// Auftragspositionen fuer Produktliste-Tab (Uebernahme in STZ)
		// Live-Berechnung wie im Desktop (stundenzettel_commande.php)
		$orderLines = array();
		$sqlOL = "SELECT cd.rowid, cd.fk_product, cd.qty, cd.description,";
		$sqlOL .= " p.ref as product_ref, p.label as product_label,";
		// Verbaut (origin order/added)
		$sqlOL .= " COALESCE((SELECT SUM(sp.qty_done) FROM ".MAIN_DB_PREFIX."stundenzettel_product sp";
		$sqlOL .= "   JOIN ".MAIN_DB_PREFIX."stundenzettel s ON s.rowid = sp.fk_stundenzettel";
		$sqlOL .= "   WHERE sp.fk_commandedet = cd.rowid AND sp.origin IN ('order', 'added')), 0) as qty_delivered,";
		// Mehraufwand (origin additional)
		$sqlOL .= " COALESCE((SELECT SUM(sp2.qty_done) FROM ".MAIN_DB_PREFIX."stundenzettel_product sp2";
		$sqlOL .= "   JOIN ".MAIN_DB_PREFIX."stundenzettel s2 ON s2.rowid = sp2.fk_stundenzettel";
		$sqlOL .= "   WHERE sp2.fk_product = cd.fk_product AND cd.fk_product > 0 AND sp2.origin = 'additional' AND s2.fk_commande = ".((int)$orderId)."), 0) as qty_additional,";
		// Entfaellt
		$sqlOL .= " COALESCE((SELECT SUM(sp3.qty_done) FROM ".MAIN_DB_PREFIX."stundenzettel_product sp3";
		$sqlOL .= "   JOIN ".MAIN_DB_PREFIX."stundenzettel s3 ON s3.rowid = sp3.fk_stundenzettel";
		$sqlOL .= "   WHERE sp3.origin = 'omitted' AND s3.fk_commande = ".((int)$orderId);
		$sqlOL .= "   AND ((sp3.fk_product = cd.fk_product AND cd.fk_product > 0) OR sp3.fk_commandedet = cd.rowid)), 0) as qty_omitted,";
		// Ruecknahmen
		$sqlOL .= " COALESCE((SELECT SUM(sp4.qty_done) FROM ".MAIN_DB_PREFIX."stundenzettel_product sp4";
		$sqlOL .= "   JOIN ".MAIN_DB_PREFIX."stundenzettel s4 ON s4.rowid = sp4.fk_stundenzettel";
		$sqlOL .= "   WHERE sp4.origin = 'returned' AND s4.fk_commande = ".((int)$orderId);
		$sqlOL .= "   AND ((sp4.fk_product = cd.fk_product AND cd.fk_product > 0) OR sp4.fk_commandedet = cd.rowid)), 0) as qty_returned";
		$sqlOL .= " FROM ".MAIN_DB_PREFIX."commandedet as cd";
		$sqlOL .= " LEFT JOIN ".MAIN_DB_PREFIX."product as p ON p.rowid = cd.fk_product";
		$sqlOL .= " WHERE cd.fk_commande = ".((int)$orderId);
		$sqlOL .= " AND (cd.fk_product > 0 OR ((cd.fk_product IS NULL OR cd.fk_product = 0) AND cd.description IS NOT NULL AND cd.description != ''))";
		$sqlOL .= " AND (cd.special_code IS NULL OR cd.special_code = 0)";
		$sqlOL .= " ORDER BY cd.rang";

		$resOL = $db->query($sqlOL);
		if ($resOL) {
			while ($obj = $db->fetch_object($resOL)) {
				$label = '';
				if ($obj->product_ref) {
					$label = $obj->product_ref.' - '.$obj->product_label;
				} else {
					$label = strip_tags($obj->description ?: '');
					if (strlen($label) > 80) $label = substr($label, 0, 77).'...';
				}

				$qtyDelivered = (float)$obj->qty_delivered;
				$qtyAdditional = (float)$obj->qty_additional;
				$qtyOmitted = (float)$obj->qty_omitted;
				$qtyReturned = (float)$obj->qty_returned;
				$effectiveDelivered = $qtyDelivered - $qtyReturned;
				// Effektive Gesamtmenge = Original + Mehraufwand - Entfaellt - Ruecknahmen (wie Desktop)
				$effectiveOrdered = $obj->qty + $qtyAdditional - $qtyOmitted - $qtyReturned;
				$qtyRemaining = $effectiveOrdered - $effectiveDelivered;

				// Pruefen ob bereits auf dem aktuellen STZ
				$alreadyOnStz = false;
				if ($stzFound) {
					foreach ($stz->products as $sp) {
						if ($sp->fk_commandedet == $obj->rowid && in_array($sp->origin, array('order', 'added'))) {
							$alreadyOnStz = true;
							break;
						}
					}
				}

				$orderLines[] = array(
					'id' => (int)$obj->rowid,
					'fk_product' => (int)$obj->fk_product,
					'ref' => $obj->product_ref ?: '',
					'label' => $label,
					'description' => strip_tags($obj->description ?: ''),
					'qty' => (float)$obj->qty,
					'qty_effective' => (float)$effectiveOrdered,
					'qty_delivered' => $effectiveDelivered,
					'qty_remaining' => $qtyRemaining,
					'qty_additional' => $qtyAdditional,
					'qty_omitted' => $qtyOmitted,
					'qty_returned' => $qtyReturned,
					'already_on_stz' => $alreadyOnStz
				);
			}
		}
		$response['order_lines'] = $orderLines;

		// Mehraufwand-Produkte laden (nicht aus Auftrag, wie Desktop stundenzettel_commande.php)
		// origin='additional' (Mehraufwand-Bestellung) + origin='added' ohne fk_commandedet (manuell hinzugefuegt)
		$mehraufwandLines = array();

		// Ruecknahmen laden fuer Zuordnung
		$returnedProducts = array();
		$sqlRet = "SELECT sp.fk_product, sp.product_label, sp.description, SUM(sp.qty_done) as qty_returned";
		$sqlRet .= " FROM ".MAIN_DB_PREFIX."stundenzettel_product sp";
		$sqlRet .= " INNER JOIN ".MAIN_DB_PREFIX."stundenzettel s ON s.rowid = sp.fk_stundenzettel";
		$sqlRet .= " WHERE s.fk_commande = ".((int)$orderId);
		$sqlRet .= " AND sp.origin = 'returned'";
		$sqlRet .= " GROUP BY sp.fk_product, sp.product_label, sp.description";
		$resRet = $db->query($sqlRet);
		if ($resRet) {
			while ($objRet = $db->fetch_object($resRet)) {
				$key = '';
				if ($objRet->fk_product > 0) {
					$key = 'prod_'.$objRet->fk_product;
				} else {
					$key = 'desc_'.md5(trim(strip_tags($objRet->description)));
				}
				$returnedProducts[$key] = (float)$objRet->qty_returned;
			}
		}

		// Mehraufwand-Produkte
		$sqlMA = "SELECT sp.fk_product, sp.product_ref, sp.product_label, sp.description,";
		$sqlMA .= " SUM(CASE WHEN sp.origin = 'additional' THEN sp.qty_done ELSE 0 END) as qty_additional,";
		$sqlMA .= " SUM(CASE WHEN sp.origin = 'added' AND (sp.fk_commandedet IS NULL OR sp.fk_commandedet = 0) THEN sp.qty_done ELSE 0 END) as qty_added,";
		$sqlMA .= " GROUP_CONCAT(DISTINCT s.ref SEPARATOR ', ') as stundenzettel_refs";
		$sqlMA .= " FROM ".MAIN_DB_PREFIX."stundenzettel_product sp";
		$sqlMA .= " INNER JOIN ".MAIN_DB_PREFIX."stundenzettel s ON s.rowid = sp.fk_stundenzettel";
		$sqlMA .= " WHERE s.fk_commande = ".((int)$orderId);
		$sqlMA .= " AND (sp.origin = 'additional' OR (sp.origin = 'added' AND (sp.fk_commandedet IS NULL OR sp.fk_commandedet = 0)))";
		$sqlMA .= " GROUP BY sp.fk_product, sp.product_ref, sp.product_label, sp.description";
		$sqlMA .= " ORDER BY sp.product_ref, sp.description";

		$resMA = $db->query($sqlMA);
		if ($resMA) {
			while ($objMA = $db->fetch_object($resMA)) {
				$qtyAdditional = (float)$objMA->qty_additional;
				$qtyAdded = (float)$objMA->qty_added;

				// Ruecknahmen zuordnen
				$returnKey = ($objMA->fk_product > 0) ? 'prod_'.$objMA->fk_product : 'desc_'.md5(trim(strip_tags($objMA->description)));
				$qtyReturned = isset($returnedProducts[$returnKey]) ? $returnedProducts[$returnKey] : 0;

				// Beauftragt (Zielmenge) und Verbaut berechnen (wie Desktop)
				$qtyTarget = (($qtyAdditional > 0) ? $qtyAdditional : $qtyAdded) - $qtyReturned;
				$qtyDone = $qtyAdded - $qtyReturned;
				$qtyRemaining = $qtyTarget - $qtyDone;
				$isDone = ($qtyRemaining <= 0) || ($qtyTarget <= 0 && $qtyReturned > 0);

				// Label zusammenbauen
				$label = '';
				if ($objMA->product_ref) {
					$label = $objMA->product_ref.' - '.$objMA->product_label;
				} else {
					$label = strip_tags($objMA->description ?: '');
					if (strlen($label) > 80) $label = substr($label, 0, 77).'...';
				}

				$mehraufwandLines[] = array(
					'fk_product' => (int)$objMA->fk_product,
					'ref' => $objMA->product_ref ?: '',
					'label' => $label,
					'description' => strip_tags($objMA->description ?: ''),
					'qty_target' => (float)$qtyTarget,
					'qty_done' => (float)$qtyDone,
					'qty_remaining' => (float)$qtyRemaining,
					'qty_returned' => (float)$qtyReturned,
					'stz_refs' => $objMA->stundenzettel_refs ?: '',
					'is_done' => $isDone
				);
			}
		}
		$response['mehraufwand_lines'] = $mehraufwandLines;

		$response['success'] = true;
		break;

	// ---- Neuen Stundenzettel erstellen ----
	case 'create_stundenzettel':
		if (!$canWrite) {
			$response['error'] = 'Keine Schreibberechtigung';
			break;
		}

		$orderId = GETPOST('order_id', 'int');
		$date = GETPOST('date', 'alpha');

		if ($orderId <= 0 || empty($date)) {
			$response['error'] = 'Auftrags-ID und Datum erforderlich';
			break;
		}

		// Auftrag pruefen
		$order = new Commande($db);
		if ($order->fetch($orderId) <= 0) {
			$response['error'] = 'Auftrag nicht gefunden';
			break;
		}

		// Prüfe ob fuer dieses Datum bereits ein STZ existiert
		$sqlCheck = "SELECT rowid FROM ".MAIN_DB_PREFIX."stundenzettel";
		$sqlCheck .= " WHERE fk_commande = ".((int)$orderId);
		$sqlCheck .= " AND date_stundenzettel = '".$db->escape($date)."'";
		$sqlCheck .= " AND fk_user_author = ".((int)$user->id);
		$resCheck = $db->query($sqlCheck);
		if ($resCheck && $db->num_rows($resCheck) > 0) {
			$objExist = $db->fetch_object($resCheck);
			$response['success'] = true;
			$response['stz_id'] = (int)$objExist->rowid;
			$response['message'] = 'Stundenzettel fuer dieses Datum existiert bereits';
			break;
		}

		$stz = new Stundenzettel($db);
		$stz->fk_commande = $orderId;
		$stz->fk_soc = $order->socid;
		$stz->date_stundenzettel = $db->idate(strtotime($date));
		$stz->fk_user_author = $user->id;

		$result = $stz->create($user);
		if ($result > 0) {
			$response['success'] = true;
			$response['stz_id'] = (int)$result;
		} else {
			$response['error'] = $stz->error ?: 'Fehler beim Erstellen';
		}
		break;

	// ---- Leistung hinzufuegen ----
	case 'add_leistung':
		$stzId = GETPOST('stz_id', 'int');
		$date = GETPOST('date', 'alpha');
		$timeStart = GETPOST('time_start', 'alpha');
		$timeEnd = GETPOST('time_end', 'alpha');
		$description = GETPOST('description', 'restricthtml');
		$fkProduct = GETPOST('fk_product', 'int');

		$stz = new Stundenzettel($db);
		if ($stz->fetch($stzId) <= 0) {
			$response['error'] = 'Stundenzettel nicht gefunden';
			break;
		}

		if (!canEditStz($stz, $user, $canWriteAll)) {
			$response['error'] = 'Keine Berechtigung oder nicht im Entwurf';
			break;
		}

		$result = $stz->addLeistung($user, $date, $timeStart, $timeEnd, $description, $fkProduct > 0 ? $fkProduct : null);
		if ($result > 0) {
			$response['success'] = true;
			$response['leistung_id'] = (int)$result;
		} else {
			$response['error'] = $stz->error ?: 'Fehler beim Hinzufuegen';
		}
		break;

	// ---- Leistung aktualisieren ----
	case 'update_leistung':
		$stzId = GETPOST('stz_id', 'int');
		$leistungId = GETPOST('leistung_id', 'int');
		$date = GETPOST('date', 'alpha');
		$timeStart = GETPOST('time_start', 'alpha');
		$timeEnd = GETPOST('time_end', 'alpha');
		$description = GETPOST('description', 'restricthtml');
		$fkProduct = GETPOST('fk_product', 'int');

		$stz = new Stundenzettel($db);
		if ($stz->fetch($stzId) <= 0) {
			$response['error'] = 'Stundenzettel nicht gefunden';
			break;
		}

		if (!canEditStz($stz, $user, $canWriteAll)) {
			$response['error'] = 'Keine Berechtigung oder nicht im Entwurf';
			break;
		}

		$result = $stz->updateLeistung($leistungId, $date, $timeStart, $timeEnd, $description, $fkProduct > 0 ? $fkProduct : null);
		if ($result > 0) {
			$response['success'] = true;
		} else {
			$response['error'] = $stz->error ?: 'Fehler beim Aktualisieren';
		}
		break;

	// ---- Leistung loeschen ----
	case 'delete_leistung':
		$stzId = GETPOST('stz_id', 'int');
		$leistungId = GETPOST('leistung_id', 'int');

		$stz = new Stundenzettel($db);
		if ($stz->fetch($stzId) <= 0) {
			$response['error'] = 'Stundenzettel nicht gefunden';
			break;
		}

		if (!canEditStz($stz, $user, $canWriteAll)) {
			$response['error'] = 'Keine Berechtigung oder nicht im Entwurf';
			break;
		}

		$result = $stz->deleteLeistung($leistungId);
		if ($result > 0) {
			$response['success'] = true;
		} else {
			$response['error'] = 'Fehler beim Loeschen';
		}
		break;

	// ---- Produktmenge aktualisieren ----
	case 'update_qty':
		$stzId = GETPOST('stz_id', 'int');
		$lineId = GETPOST('line_id', 'int');
		$qtyDone = GETPOST('qty_done', 'alpha');

		$stz = new Stundenzettel($db);
		if ($stz->fetch($stzId) <= 0) {
			$response['error'] = 'Stundenzettel nicht gefunden';
			break;
		}

		if (!canEditStz($stz, $user, $canWriteAll)) {
			$response['error'] = 'Keine Berechtigung oder nicht im Entwurf';
			break;
		}

		$result = $stz->updateProductQty($lineId, (float)$qtyDone);
		if ($result > 0) {
			$response['success'] = true;
		} else {
			$response['error'] = 'Fehler beim Aktualisieren';
		}
		break;

	// ---- Produkt hinzufuegen ----
	case 'add_product':
		$stzId = GETPOST('stz_id', 'int');
		$fkProduct = GETPOST('fk_product', 'int');
		$qty = (float)GETPOST('qty', 'alpha');
		$description = GETPOST('description', 'restricthtml');

		$stz = new Stundenzettel($db);
		if ($stz->fetch($stzId) <= 0) {
			$response['error'] = 'Stundenzettel nicht gefunden';
			break;
		}

		if (!canEditStz($stz, $user, $canWriteAll)) {
			$response['error'] = 'Keine Berechtigung oder nicht im Entwurf';
			break;
		}

		if ($fkProduct <= 0 && empty($description)) {
			$response['error'] = 'Produkt oder Beschreibung erforderlich';
			break;
		}

		// Pruefen ob Produkt im Auftrag vorhanden (fk_commandedet finden)
		$fkCommandedet = 0;
		if ($fkProduct > 0 && $stz->fk_commande > 0) {
			$sqlCd = "SELECT cd.rowid FROM ".MAIN_DB_PREFIX."commandedet as cd";
			$sqlCd .= " WHERE cd.fk_commande = ".((int)$stz->fk_commande);
			$sqlCd .= " AND cd.fk_product = ".((int)$fkProduct);
			$sqlCd .= " LIMIT 1";
			$resCd = $db->query($sqlCd);
			if ($resCd && $db->num_rows($resCd) > 0) {
				$objCd = $db->fetch_object($resCd);
				$fkCommandedet = (int)$objCd->rowid;
			}
		}

		// Pruefen ob bereits eine Zeile mit gleichem Produkt existiert -> addieren
		$stz->fetchProducts();
		$existingLine = null;
		foreach ($stz->products as $p) {
			if ($fkProduct > 0 && $p->fk_product == $fkProduct && in_array($p->origin, array('order', 'added'))) {
				$existingLine = $p;
				break;
			}
		}

		if ($existingLine) {
			// Menge addieren
			$newQty = (float)$existingLine->qty_done + $qty;
			$result = $stz->updateProductQty($existingLine->rowid, $newQty);
		} else {
			$result = $stz->addProduct(
				$fkProduct > 0 ? $fkProduct : 0,
				$fkCommandedet > 0 ? $fkCommandedet : null,
				null,
				0,
				$qty,
				'added',
				$description
			);
		}

		if ($result > 0) {
			$response['success'] = true;
		} else {
			$response['error'] = $stz->error ?: 'Fehler beim Hinzufuegen';
		}
		break;

	// ---- Produkt loeschen ----
	case 'delete_product':
		$stzId = GETPOST('stz_id', 'int');
		$lineId = GETPOST('line_id', 'int');

		$stz = new Stundenzettel($db);
		if ($stz->fetch($stzId) <= 0) {
			$response['error'] = 'Stundenzettel nicht gefunden';
			break;
		}

		if (!canEditStz($stz, $user, $canWriteAll)) {
			$response['error'] = 'Keine Berechtigung oder nicht im Entwurf';
			break;
		}

		$result = $stz->deleteProduct($lineId);
		if ($result > 0) {
			$response['success'] = true;
		} else {
			$response['error'] = 'Fehler beim Loeschen';
		}
		break;

	// ---- Mehraufwand hinzufuegen ----
	case 'add_mehraufwand':
		$stzId = GETPOST('stz_id', 'int');
		$fkProduct = GETPOST('fk_product', 'int');
		$qty = (float)GETPOST('qty', 'alpha');
		$description = GETPOST('description', 'restricthtml');
		$reason = GETPOST('reason', 'restricthtml');

		$stz = new Stundenzettel($db);
		if ($stz->fetch($stzId) <= 0) {
			$response['error'] = 'Stundenzettel nicht gefunden';
			break;
		}

		if (!canEditStz($stz, $user, $canWriteAll)) {
			$response['error'] = 'Keine Berechtigung oder nicht im Entwurf';
			break;
		}

		$desc = $reason ?: $description;
		$result = $stz->addProduct(
			$fkProduct > 0 ? $fkProduct : 0,
			null, null,
			0, $qty,
			'additional',
			$desc
		);

		if ($result > 0) {
			$response['success'] = true;
		} else {
			$response['error'] = $stz->error ?: 'Fehler beim Hinzufuegen';
		}
		break;

	// ---- Mehraufwand loeschen ----
	case 'delete_mehraufwand':
		$stzId = GETPOST('stz_id', 'int');
		$lineId = GETPOST('line_id', 'int');

		$stz = new Stundenzettel($db);
		if ($stz->fetch($stzId) <= 0) {
			$response['error'] = 'Stundenzettel nicht gefunden';
			break;
		}

		if (!canEditStz($stz, $user, $canWriteAll)) {
			$response['error'] = 'Keine Berechtigung oder nicht im Entwurf';
			break;
		}

		$result = $stz->deleteProduct($lineId);
		if ($result > 0) {
			$response['success'] = true;
		} else {
			$response['error'] = 'Fehler beim Loeschen';
		}
		break;

	// ---- Entfaellt hinzufuegen ----
	case 'add_entfaellt':
		$stzId = GETPOST('stz_id', 'int');
		$source = GETPOST('source', 'alphanohtml'); // commandedet_ID oder mehraufwand_SPROWID
		$qty = (float)GETPOST('qty', 'alpha');
		$reason = GETPOST('reason', 'restricthtml');

		$stz = new Stundenzettel($db);
		if ($stz->fetch($stzId) <= 0) {
			$response['error'] = 'Stundenzettel nicht gefunden';
			break;
		}

		if (!canEditStz($stz, $user, $canWriteAll)) {
			$response['error'] = 'Keine Berechtigung oder nicht im Entwurf';
			break;
		}

		if (empty($source)) {
			$response['error'] = 'Quelle erforderlich';
			break;
		}

		// Source parsen: "cd_123" (Auftragszeile) oder "ma_456" (Mehraufwand)
		$parts = explode('_', $source);
		$sourceType = $parts[0];
		$sourceId = isset($parts[1]) ? (int)$parts[1] : 0;

		if ($sourceType === 'cd' && $sourceId > 0) {
			// Auftragsposition
			$sqlCd = "SELECT cd.rowid, cd.fk_product, cd.description, p.ref, p.label";
			$sqlCd .= " FROM ".MAIN_DB_PREFIX."commandedet as cd";
			$sqlCd .= " LEFT JOIN ".MAIN_DB_PREFIX."product as p ON p.rowid = cd.fk_product";
			$sqlCd .= " WHERE cd.rowid = ".((int)$sourceId);
			$resCd = $db->query($sqlCd);
			if ($resCd && $db->num_rows($resCd) > 0) {
				$objCd = $db->fetch_object($resCd);
				$result = $stz->addProduct(
					$objCd->fk_product > 0 ? (int)$objCd->fk_product : 0,
					(int)$objCd->rowid,
					null, 0, $qty, 'omitted',
					$reason ?: '',
					$objCd->label ?: strip_tags($objCd->description)
				);
				if ($result > 0) {
					$response['success'] = true;
				} else {
					$response['error'] = $stz->error ?: 'Fehler';
				}
			} else {
				$response['error'] = 'Auftragsposition nicht gefunden';
			}
		} elseif ($sourceType === 'ma' && $sourceId > 0) {
			// Mehraufwand-Zeile
			$sqlMa = "SELECT sp.* FROM ".MAIN_DB_PREFIX."stundenzettel_product as sp";
			$sqlMa .= " WHERE sp.rowid = ".((int)$sourceId);
			$sqlMa .= " AND sp.fk_stundenzettel = ".((int)$stz->id);
			$sqlMa .= " AND sp.origin = 'additional'";
			$resMa = $db->query($sqlMa);
			if ($resMa && $db->num_rows($resMa) > 0) {
				$objMa = $db->fetch_object($resMa);
				// Mehraufwand-Menge reduzieren
				$newMaQty = (float)$objMa->qty_done - $qty;
				if ($newMaQty > 0) {
					$stz->updateProductQty($sourceId, $newMaQty);
				} else {
					$stz->deleteProduct($sourceId);
				}
				// Entfaellt-Zeile anlegen
				$result = $stz->addProduct(
					$objMa->fk_product > 0 ? (int)$objMa->fk_product : 0,
					$objMa->fk_commandedet > 0 ? (int)$objMa->fk_commandedet : null,
					null, 0, $qty, 'omitted',
					$reason ?: '',
					$objMa->product_label
				);
				$response['success'] = ($result > 0);
			} else {
				$response['error'] = 'Mehraufwand nicht gefunden';
			}
		} else {
			$response['error'] = 'Ungueltige Quelle';
		}
		break;

	// ---- Entfaellt loeschen ----
	case 'delete_entfaellt':
		$stzId = GETPOST('stz_id', 'int');
		$lineId = GETPOST('line_id', 'int');

		$stz = new Stundenzettel($db);
		if ($stz->fetch($stzId) <= 0) {
			$response['error'] = 'Stundenzettel nicht gefunden';
			break;
		}

		if (!canEditStz($stz, $user, $canWriteAll)) {
			$response['error'] = 'Keine Berechtigung oder nicht im Entwurf';
			break;
		}

		$result = $stz->deleteProduct($lineId);
		if ($result > 0) {
			$response['success'] = true;
		} else {
			$response['error'] = 'Fehler beim Loeschen';
		}
		break;

	// ---- Ruecknahme hinzufuegen ----
	case 'add_ruecknahme':
		$stzId = GETPOST('stz_id', 'int');
		$source = GETPOST('source', 'alphanohtml');
		$qty = (float)GETPOST('qty', 'alpha');
		$reason = GETPOST('reason', 'restricthtml');

		$stz = new Stundenzettel($db);
		if ($stz->fetch($stzId) <= 0) {
			$response['error'] = 'Stundenzettel nicht gefunden';
			break;
		}

		if (!canEditStz($stz, $user, $canWriteAll)) {
			$response['error'] = 'Keine Berechtigung oder nicht im Entwurf';
			break;
		}

		if (empty($source)) {
			$response['error'] = 'Quelle erforderlich';
			break;
		}

		// Source: "cd_123" (Auftragszeile) oder "sp_456" (Stundenzettel-Produkt)
		$parts = explode('_', $source);
		$sourceType = $parts[0];
		$sourceId = isset($parts[1]) ? (int)$parts[1] : 0;

		if ($sourceType === 'cd' && $sourceId > 0) {
			// Auftragsposition - Ruecknahme
			$sqlCd = "SELECT cd.rowid, cd.fk_product, cd.description, p.ref, p.label";
			$sqlCd .= " FROM ".MAIN_DB_PREFIX."commandedet as cd";
			$sqlCd .= " LEFT JOIN ".MAIN_DB_PREFIX."product as p ON p.rowid = cd.fk_product";
			$sqlCd .= " WHERE cd.rowid = ".((int)$sourceId);
			$resCd = $db->query($sqlCd);
			if ($resCd && $db->num_rows($resCd) > 0) {
				$objCd = $db->fetch_object($resCd);
				$result = $stz->addProduct(
					$objCd->fk_product > 0 ? (int)$objCd->fk_product : 0,
					(int)$objCd->rowid,
					null, 0, $qty, 'returned',
					$reason ?: '',
					$objCd->label ?: strip_tags($objCd->description)
				);
				if ($result > 0) {
					$response['success'] = true;
				} else {
					$response['error'] = $stz->error ?: 'Fehler';
				}
			} else {
				$response['error'] = 'Auftragsposition nicht gefunden';
			}
		} elseif ($sourceType === 'sp' && $sourceId > 0) {
			// Stundenzettel-Produkt (added ohne commandedet)
			$sqlSp = "SELECT sp.* FROM ".MAIN_DB_PREFIX."stundenzettel_product as sp";
			$sqlSp .= " WHERE sp.rowid = ".((int)$sourceId);
			$resSp = $db->query($sqlSp);
			if ($resSp && $db->num_rows($resSp) > 0) {
				$objSp = $db->fetch_object($resSp);
				$result = $stz->addProduct(
					$objSp->fk_product > 0 ? (int)$objSp->fk_product : 0,
					$objSp->fk_commandedet > 0 ? (int)$objSp->fk_commandedet : null,
					null, 0, $qty, 'returned',
					$reason ?: '',
					$objSp->product_label
				);
				if ($result > 0) {
					$response['success'] = true;
				} else {
					$response['error'] = $stz->error ?: 'Fehler';
				}
			} else {
				$response['error'] = 'Produkt nicht gefunden';
			}
		} else {
			$response['error'] = 'Ungueltige Quelle';
		}
		break;

	// ---- Ruecknahme loeschen ----
	case 'delete_ruecknahme':
		$stzId = GETPOST('stz_id', 'int');
		$lineId = GETPOST('line_id', 'int');

		$stz = new Stundenzettel($db);
		if ($stz->fetch($stzId) <= 0) {
			$response['error'] = 'Stundenzettel nicht gefunden';
			break;
		}

		if (!canEditStz($stz, $user, $canWriteAll)) {
			$response['error'] = 'Keine Berechtigung oder nicht im Entwurf';
			break;
		}

		$result = $stz->deleteProduct($lineId);
		if ($result > 0) {
			$response['success'] = true;
		} else {
			$response['error'] = 'Fehler beim Loeschen';
		}
		break;

	// ---- Notiz hinzufuegen ----
	case 'add_note':
		$stzId = GETPOST('stz_id', 'int');
		$noteText = GETPOST('note', 'restricthtml');

		$stz = new Stundenzettel($db);
		if ($stz->fetch($stzId) <= 0) {
			$response['error'] = 'Stundenzettel nicht gefunden';
			break;
		}

		if (!canEditStz($stz, $user, $canWriteAll)) {
			$response['error'] = 'Keine Berechtigung oder nicht im Entwurf';
			break;
		}

		$result = $stz->addNote($user, $noteText);
		if ($result > 0) {
			$response['success'] = true;
		} else {
			$response['error'] = 'Fehler beim Hinzufuegen';
		}
		break;

	// ---- Notiz togglen ----
	case 'toggle_note':
		$stzId = GETPOST('stz_id', 'int');
		$noteId = GETPOST('note_id', 'int');
		$checked = GETPOST('checked', 'int');

		$stz = new Stundenzettel($db);
		if ($stz->fetch($stzId) <= 0) {
			$response['error'] = 'Stundenzettel nicht gefunden';
			break;
		}

		$result = $stz->updateNoteStatus($noteId, $checked);
		if ($result > 0) {
			$response['success'] = true;
		} else {
			$response['error'] = 'Fehler beim Aktualisieren';
		}
		break;

	// ---- Notiz loeschen ----
	case 'delete_note':
		$stzId = GETPOST('stz_id', 'int');
		$noteId = GETPOST('note_id', 'int');

		$stz = new Stundenzettel($db);
		if ($stz->fetch($stzId) <= 0) {
			$response['error'] = 'Stundenzettel nicht gefunden';
			break;
		}

		if (!canEditStz($stz, $user, $canWriteAll)) {
			$response['error'] = 'Keine Berechtigung oder nicht im Entwurf';
			break;
		}

		$result = $stz->deleteNote($noteId);
		if ($result > 0) {
			$response['success'] = true;
		} else {
			$response['error'] = 'Fehler beim Loeschen';
		}
		break;

	// ---- Produktsuche ----
	case 'search_products':
		$term = GETPOST('term', 'alphanohtml');
		if (strlen($term) < 2) {
			$response['error'] = 'Mindestens 2 Zeichen';
			break;
		}

		$sql = "SELECT p.rowid as id, p.ref, p.label";
		$sql .= " FROM ".MAIN_DB_PREFIX."product as p";
		$sql .= " WHERE (p.ref LIKE '%".$db->escape($term)."%' OR p.label LIKE '%".$db->escape($term)."%')";
		$sql .= " AND p.entity IN (".getEntity('product').")";
		$sql .= " AND p.tosell = 1"; // Nur verkaufbare Produkte
		$sql .= " ORDER BY p.ref ASC";
		$sql .= " LIMIT 20";

		$resql = $db->query($sql);
		$products = array();
		if ($resql) {
			while ($obj = $db->fetch_object($resql)) {
				$products[] = array(
					'id' => (int)$obj->id,
					'ref' => $obj->ref,
					'label' => $obj->label
				);
			}
		}
		$response['success'] = true;
		$response['products'] = $products;
		break;

	// ---- Entfaellt-Optionen laden ----
	case 'get_entfaellt_options':
		$stzId = GETPOST('stz_id', 'int');
		$orderId = GETPOST('order_id', 'int');

		$options = array();

		// Auftragspositionen mit verfuegbarer Menge
		$sql = "SELECT cd.rowid, cd.fk_product, cd.qty, cd.description,";
		$sql .= " p.ref, p.label,";
		$sql .= " COALESCE((SELECT SUM(sp.qty_done) FROM ".MAIN_DB_PREFIX."stundenzettel_product sp";
		$sql .= "   INNER JOIN ".MAIN_DB_PREFIX."stundenzettel s ON s.rowid = sp.fk_stundenzettel";
		$sql .= "   WHERE s.fk_commande = ".((int)$orderId);
		$sql .= "   AND (sp.fk_commandedet = cd.rowid OR (sp.fk_product = cd.fk_product AND cd.fk_product > 0))";
		$sql .= "   AND sp.origin IN ('order','added')), 0) as qty_used,";
		$sql .= " COALESCE((SELECT SUM(sp2.qty_done) FROM ".MAIN_DB_PREFIX."stundenzettel_product sp2";
		$sql .= "   INNER JOIN ".MAIN_DB_PREFIX."stundenzettel s2 ON s2.rowid = sp2.fk_stundenzettel";
		$sql .= "   WHERE s2.fk_commande = ".((int)$orderId);
		$sql .= "   AND (sp2.fk_commandedet = cd.rowid OR (sp2.fk_product = cd.fk_product AND cd.fk_product > 0))";
		$sql .= "   AND sp2.origin = 'omitted'), 0) as qty_omitted";
		$sql .= " FROM ".MAIN_DB_PREFIX."commandedet as cd";
		$sql .= " LEFT JOIN ".MAIN_DB_PREFIX."product as p ON p.rowid = cd.fk_product";
		$sql .= " WHERE cd.fk_commande = ".((int)$orderId);
		$sql .= " ORDER BY cd.rang";

		$resql = $db->query($sql);
		if ($resql) {
			while ($obj = $db->fetch_object($resql)) {
				$available = (float)$obj->qty - (float)$obj->qty_used - (float)$obj->qty_omitted;
				if ($available > 0) {
					$label = $obj->label ?: strip_tags($obj->description);
					$options[] = array(
						'value' => 'cd_'.$obj->rowid,
						'label' => ($obj->ref ? $obj->ref.' - ' : '').$label,
						'max_qty' => $available
					);
				}
			}
		}

		// Mehraufwand-Zeilen
		if ($stzId > 0) {
			$sqlMa = "SELECT sp.rowid, sp.fk_product, sp.product_ref, sp.product_label, sp.description, sp.qty_done";
			$sqlMa .= " FROM ".MAIN_DB_PREFIX."stundenzettel_product as sp";
			$sqlMa .= " WHERE sp.fk_stundenzettel = ".((int)$stzId);
			$sqlMa .= " AND sp.origin = 'additional'";
			$sqlMa .= " AND sp.qty_done > 0";
			$resMa = $db->query($sqlMa);
			if ($resMa) {
				while ($obj = $db->fetch_object($resMa)) {
					$label = $obj->product_label ?: strip_tags($obj->description);
					$options[] = array(
						'value' => 'ma_'.$obj->rowid,
						'label' => '[Mehraufwand] '.($obj->product_ref ? $obj->product_ref.' - ' : '').$label,
						'max_qty' => (float)$obj->qty_done
					);
				}
			}
		}

		$response['success'] = true;
		$response['options'] = $options;
		break;

	// ---- Ruecknahme-Optionen laden ----
	case 'get_ruecknahme_options':
		$stzId = GETPOST('stz_id', 'int');
		$orderId = GETPOST('order_id', 'int');

		$options = array();

		// Verbaute Auftragspositionen
		$sql = "SELECT cd.rowid, cd.fk_product, cd.description,";
		$sql .= " p.ref, p.label,";
		$sql .= " COALESCE((SELECT SUM(sp.qty_done) FROM ".MAIN_DB_PREFIX."stundenzettel_product sp";
		$sql .= "   INNER JOIN ".MAIN_DB_PREFIX."stundenzettel s ON s.rowid = sp.fk_stundenzettel";
		$sql .= "   WHERE s.fk_commande = ".((int)$orderId);
		$sql .= "   AND (sp.fk_commandedet = cd.rowid OR (sp.fk_product = cd.fk_product AND cd.fk_product > 0))";
		$sql .= "   AND sp.origin IN ('order','added')), 0) as qty_delivered,";
		$sql .= " COALESCE((SELECT SUM(sp2.qty_done) FROM ".MAIN_DB_PREFIX."stundenzettel_product sp2";
		$sql .= "   INNER JOIN ".MAIN_DB_PREFIX."stundenzettel s2 ON s2.rowid = sp2.fk_stundenzettel";
		$sql .= "   WHERE s2.fk_commande = ".((int)$orderId);
		$sql .= "   AND (sp2.fk_commandedet = cd.rowid OR (sp2.fk_product = cd.fk_product AND cd.fk_product > 0))";
		$sql .= "   AND sp2.origin = 'returned'), 0) as qty_returned";
		$sql .= " FROM ".MAIN_DB_PREFIX."commandedet as cd";
		$sql .= " LEFT JOIN ".MAIN_DB_PREFIX."product as p ON p.rowid = cd.fk_product";
		$sql .= " WHERE cd.fk_commande = ".((int)$orderId);
		$sql .= " ORDER BY cd.rang";

		$resql = $db->query($sql);
		if ($resql) {
			while ($obj = $db->fetch_object($resql)) {
				$available = (float)$obj->qty_delivered - (float)$obj->qty_returned;
				if ($available > 0) {
					$label = $obj->label ?: strip_tags($obj->description);
					$options[] = array(
						'value' => 'cd_'.$obj->rowid,
						'label' => ($obj->ref ? $obj->ref.' - ' : '').$label,
						'max_qty' => $available
					);
				}
			}
		}

		// Verbaute Produkte ohne Auftragszeile (manuell hinzugefuegt)
		if ($stzId > 0) {
			$sqlSp = "SELECT sp.rowid, sp.fk_product, sp.product_ref, sp.product_label, sp.description, sp.qty_done";
			$sqlSp .= " FROM ".MAIN_DB_PREFIX."stundenzettel_product as sp";
			$sqlSp .= " WHERE sp.fk_stundenzettel = ".((int)$stzId);
			$sqlSp .= " AND sp.origin = 'added'";
			$sqlSp .= " AND (sp.fk_commandedet IS NULL OR sp.fk_commandedet = 0)";
			$sqlSp .= " AND sp.qty_done > 0";
			$resSp = $db->query($sqlSp);
			if ($resSp) {
				while ($obj = $db->fetch_object($resSp)) {
					$label = $obj->product_label ?: strip_tags($obj->description);
					$options[] = array(
						'value' => 'sp_'.$obj->rowid,
						'label' => '[Hinzugefuegt] '.($obj->product_ref ? $obj->product_ref.' - ' : '').$label,
						'max_qty' => (float)$obj->qty_done
					);
				}
			}
		}

		$response['success'] = true;
		$response['options'] = $options;
		break;

	// ---- Dienstleistungen laden ----
	case 'get_services':
		$sql = "SELECT p.rowid as id, p.ref, p.label";
		$sql .= " FROM ".MAIN_DB_PREFIX."product as p";
		$sql .= " WHERE p.fk_product_type = 1"; // Typ 1 = Dienstleistung
		$sql .= " AND p.tosell = 1";
		$sql .= " AND p.entity IN (".getEntity('product').")";
		$sql .= " ORDER BY p.ref ASC";
		$sql .= " LIMIT 50";

		$resql = $db->query($sql);
		$services = array();
		if ($resql) {
			while ($obj = $db->fetch_object($resql)) {
				$services[] = array(
					'id' => (int)$obj->id,
					'ref' => $obj->ref,
					'label' => $obj->label
				);
			}
		}
		$response['success'] = true;
		$response['services'] = $services;
		break;

	// ---- Auftragspositionen in STZ uebernehmen ----
	case 'transfer_order_products':
		if (!$canWrite) {
			$response['error'] = 'Keine Schreibberechtigung';
			break;
		}

		$stzId = GETPOST('stz_id', 'int');
		$lineIds = GETPOST('line_ids', 'alpha'); // Kommaseparierte commandedet IDs

		$stz = new Stundenzettel($db);
		if ($stz->fetch($stzId) <= 0) {
			$response['error'] = 'Stundenzettel nicht gefunden';
			break;
		}
		if (!canEditStz($stz, $user, $canWriteAll)) {
			$response['error'] = 'Keine Berechtigung oder nicht im Entwurf';
			break;
		}

		$ids = array_filter(array_map('intval', explode(',', $lineIds)));
		$added = 0;
		foreach ($ids as $lineId) {
			if ($lineId <= 0) continue;

			// Auftragszeile laden
			$sqlLine = "SELECT cd.rowid, cd.fk_product, cd.qty, cd.description";
			$sqlLine .= " FROM ".MAIN_DB_PREFIX."commandedet as cd";
			$sqlLine .= " WHERE cd.rowid = ".((int)$lineId);
			$resLine = $db->query($sqlLine);
			if (!$resLine || !($objLine = $db->fetch_object($resLine))) continue;

			// Pruefen ob schon auf diesem STZ
			$sqlCheck = "SELECT rowid FROM ".MAIN_DB_PREFIX."stundenzettel_product";
			$sqlCheck .= " WHERE fk_stundenzettel = ".((int)$stzId);
			$sqlCheck .= " AND fk_commandedet = ".((int)$lineId);
			$sqlCheck .= " AND origin IN ('order', 'added')";
			$resCheck = $db->query($sqlCheck);
			if ($resCheck && $db->num_rows($resCheck) > 0) continue; // Bereits vorhanden

			$stz->addProduct(
				$objLine->fk_product,
				$objLine->rowid,      // fk_commandedet
				null,
				$objLine->qty,        // qty_original
				0,                    // qty_done
				'order',
				$objLine->description
			);
			$added++;
		}

		// Mehraufwand-Produkte uebernehmen (als origin='added' ohne fk_commandedet)
		$maProductsJson = GETPOST('ma_products', 'restricthtml');
		if (!empty($maProductsJson)) {
			$maProducts = json_decode($maProductsJson, true);
			if (is_array($maProducts)) {
				foreach ($maProducts as $ma) {
					$fkProduct = isset($ma['fk_product']) ? (int)$ma['fk_product'] : 0;
					$description = isset($ma['description']) ? $ma['description'] : '';
					$qty = isset($ma['qty']) ? (float)$ma['qty'] : 0;

					// Pruefen ob dieses Mehraufwand-Produkt schon auf dem STZ ist
					$sqlCheckMA = "SELECT rowid FROM ".MAIN_DB_PREFIX."stundenzettel_product";
					$sqlCheckMA .= " WHERE fk_stundenzettel = ".((int)$stzId);
					$sqlCheckMA .= " AND origin = 'added'";
					$sqlCheckMA .= " AND (fk_commandedet IS NULL OR fk_commandedet = 0)";
					if ($fkProduct > 0) {
						$sqlCheckMA .= " AND fk_product = ".((int)$fkProduct);
					} else {
						$sqlCheckMA .= " AND (fk_product IS NULL OR fk_product = 0)";
						$sqlCheckMA .= " AND description = '".$db->escape($description)."'";
					}
					$resCheckMA = $db->query($sqlCheckMA);
					if ($resCheckMA && $db->num_rows($resCheckMA) > 0) continue; // Bereits vorhanden

					// Produkt-Label laden
					$productLabel = '';
					if ($fkProduct > 0) {
						$sqlProd = "SELECT ref, label FROM ".MAIN_DB_PREFIX."product WHERE rowid = ".((int)$fkProduct);
						$resProd = $db->query($sqlProd);
						if ($resProd && ($objProd = $db->fetch_object($resProd))) {
							$productLabel = $objProd->label;
						}
					}

					$stz->addProduct(
						$fkProduct > 0 ? $fkProduct : null,
						null,                // fk_commandedet (kein Auftragsbezug)
						null,
						$qty,                // qty_original = Zielmenge
						0,                   // qty_done
						'added',
						$description ?: $productLabel
					);
					$added++;
				}
			}
		}

		$response['success'] = true;
		$response['added'] = $added;
		break;

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

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