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

    $product_sku = $data['product_sku'] ?? '';
    $lot_number  = $data['lot_number']  ?? '';

    if (!$product_sku || !$lot_number) {
        $answer['output']  = [];
        $answer['success'] = 1;
        exit(json_encode($answer));
    }

    // Discover all warehouses
    $sth = $pdo2->prepare(
        "SELECT id, warehouse_name FROM md_warehouse
         WHERE company_id = :company_id AND status = 1"
    );
    $sth->execute([':company_id' => $company_id]);
    $warehouses = $sth->fetchAll(PDO::FETCH_ASSOC);

    $rows = [];
    foreach ($warehouses as $wh) {
        $safe  = preg_replace('/[^a-zA-Z0-9_]/', '', $wh['warehouse_name']);
        $table = "td_stock_{$safe}";

        $sth = $pdo2->prepare(
            "SELECT
                s.id,
                s.date,
                s.type,
                s.zone,
                s.aisle,
                s.rack,
                ROUND(COALESCE(s.`in`,  0), 2) AS stock_in,
                ROUND(COALESCE(s.`out`, 0), 2) AS stock_out,
                s.serial_number,
                s.description,
                '{$wh['warehouse_name']}' AS warehouse_name
             FROM `{$table}` s
             WHERE s.company_id  = :company_id
               AND s.product_sku = :product_sku
               AND s.lot_number  = :lot_number
             ORDER BY s.date DESC"
        );
        $sth->execute([
            ':company_id'  => $company_id,
            ':product_sku' => $product_sku,
            ':lot_number'  => $lot_number,
        ]);
        $rows = array_merge($rows, $sth->fetchAll(PDO::FETCH_ASSOC));
    }

    // Sort all rows by date DESC
    usort($rows, fn($a, $b) => strcmp($b['date'], $a['date']));

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