<?php
/* Copyright (C) 2026		Eduard Wisch				<data@data-it-solution.de>
 *
 * AJAX: Update product stock (Inventory mode)
 */

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

// Load Dolibarr environment
$res = 0;
if (!$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(['success' => false, 'error' => 'Failed to load Dolibarr']));
}

require_once DOL_DOCUMENT_ROOT.'/product/class/product.class.php';
require_once DOL_DOCUMENT_ROOT.'/product/stock/class/mouvementstock.class.php';

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

// Security check
if (!$user->hasRight('stock', 'mouvement', 'creer')) {
	echo json_encode(['success' => false, 'error' => 'Access denied - no stock movement rights']);
	exit;
}

// Get parameters
$productId = GETPOSTINT('product_id');
$newStock = GETPOSTFLOAT('stock');

if (empty($productId)) {
	echo json_encode(['success' => false, 'error' => 'Missing product_id']);
	exit;
}

if ($newStock === null || $newStock === '') {
	echo json_encode(['success' => false, 'error' => 'Missing stock value']);
	exit;
}

// Load product
$product = new Product($db);
if ($product->fetch($productId) <= 0) {
	echo json_encode(['success' => false, 'error' => 'Product not found']);
	exit;
}

$currentStock = (float) $product->stock_reel;
$newStock = (float) $newStock;
$diff = $newStock - $currentStock;

if ($diff == 0) {
	echo json_encode(['success' => true, 'message' => 'No change needed']);
	exit;
}

// Get default warehouse from config or use first available
$warehouseId = getDolGlobalInt('HANDYBARCODESCANNER_DEFAULT_WAREHOUSE', 0);

if ($warehouseId <= 0) {
	// Get first warehouse
	$sql = "SELECT rowid FROM ".MAIN_DB_PREFIX."entrepot WHERE statut = 1 AND entity IN (".getEntity('stock').") ORDER BY rowid ASC LIMIT 1";
	$resql = $db->query($sql);
	if ($resql && $db->num_rows($resql) > 0) {
		$obj = $db->fetch_object($resql);
		$warehouseId = $obj->rowid;
	}
}

if ($warehouseId <= 0) {
	echo json_encode(['success' => false, 'error' => 'No warehouse configured']);
	exit;
}

// Create stock movement
$movementStock = new MouvementStock($db);
$movementStock->origin_type = 'handybarcodescanner';
$movementStock->origin_id = 0;

$inventoryCode = 'INV-SCAN-'.date('Ymd-His');
$label = 'Inventur per HandyBarcodeScanner';

if ($diff > 0) {
	// Increase stock
	$result = $movementStock->reception($user, $productId, $warehouseId, $diff, 0, $label, '', '', '', '', 0, $inventoryCode);
} else {
	// Decrease stock
	$result = $movementStock->livraison($user, $productId, $warehouseId, abs($diff), 0, $label, '', '', '', '', 0, $inventoryCode);
}

if ($result < 0) {
	echo json_encode(['success' => false, 'error' => 'Stock movement failed: ' . $movementStock->error]);
	exit;
}

// Reload product to get updated stock
$product->fetch($productId);

echo json_encode([
	'success' => true,
	'old_stock' => $currentStock,
	'new_stock' => (float) $product->stock_reel,
	'difference' => $diff,
	'warehouse_id' => $warehouseId
]);