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

    $type    = $data['type'] ?? '';
    $whMgmt  = new WarehouseManager($pdo2, $company_id);

    // Resolve warehouse — supports warehouse, warehouse_from, warehouse_to
    $warehouse = (int)($data['warehouse'] ?? 0);
    if (isset($data['warehouse_from']) && $type === 'from') $warehouse = (int)$data['warehouse_from'];
    if (isset($data['warehouse_to'])   && $type === 'to')   $warehouse = (int)$data['warehouse_to'];

    if ($type === 'to') {
        // Stock_in destination — empty racks only
        $output = $whMgmt->getZonesIn($warehouse);

    } elseif ($type === 'from') {
        // Stock_out source — filter by sku + lot + serial
        $output = $whMgmt->getZonesOut(
            $warehouse,
            $data['product_sku']   ?? '',
            $data['lot_number']    ?? null,
            $data['serial_number'] ?? null
        );

    } else {
        // Admin / read-only — all zones in the warehouse
        $sth = $pdo2->prepare(
            "SELECT DISTINCT zone FROM md_rack
             WHERE company_id = :company_id AND warehouse = :warehouse
             ORDER BY CAST(zone AS UNSIGNED), zone"
        );
        $sth->execute([':company_id' => $company_id, ':warehouse' => $warehouse]);
        $output = $sth->fetchAll(PDO::FETCH_ASSOC);
    }

    // Edit mode — return all zones regardless of occupancy
    if (!empty($data['id'])) {
        $sth = $pdo2->prepare(
            "SELECT DISTINCT zone FROM md_rack
             WHERE company_id = :company_id AND warehouse = :warehouse
             ORDER BY CAST(zone AS UNSIGNED), zone"
        );
        $sth->execute([':company_id' => $company_id, ':warehouse' => $warehouse]);
        $output = $sth->fetchAll(PDO::FETCH_ASSOC);
    }

    $answer['output']  = $output;
    $answer['success'] = 1;
    exit(json_encode($answer));
?>