<?php
    session_start();
    require_once '../../../assets/utils/db_auth.php';
    require_once '../../../assets/utils/classes/WarehouseManager.php';

    // What one location holds — the quantity a stock-out or transfer from it moves
    // (StockManager takes the whole approved stock-in row in the bin).
    try {
        $whMgmt = new WarehouseManager($pdo2, $company_id);
        $row    = $whMgmt->getBinStock(
            (int)($data['warehouse'] ?? 0),
            $data['zone']  ?? '',
            $data['aisle'] ?? '',
            $data['bin']   ?? ''
        );

        $output = null;
        if ($row) {
            $sth = $pdo2->prepare("SELECT uom FROM md_product WHERE company_id = :c AND sku = :sku LIMIT 1");
            $sth->execute([':c' => $company_id, ':sku' => $row['product_sku']]);
            $output = [
                'product_sku'   => $row['product_sku'],
                'lot_number'    => $row['lot_number'],
                'serial_number' => $row['serial_number'],
                'quantity'      => (float)$row['in'],
                'uom'           => (string)($sth->fetchColumn() ?: ''),
            ];
        }

        $answer['output']  = $output;
        $answer['success'] = 1;
    } catch (Exception $e) {
        $answer['message'] = $e->getMessage();
        http_response_code(400);
    }

    exit(json_encode($answer));
?>