more OOP and restructure utils

app/ics/api/engine_report/warehouse_stats.php

@@ -2,22 +2,12 @@
     session_start();
 
     require '../../../assets/utils/db_auth.php';
+    require '../../../assets/utils/classes/Reports.php';
 
+    $report = new Reports($pdo2, $company_id);
 
-    $sql = "SELECT SUM(capacity) as total_capacity, count(*) as total_warehouse
-        FROM md_warehouse a
-        WHERE 
-            a.company_id = :company_id
-        ";
-    $sth = $pdo2->prepare($sql);
-    $sth->execute([
-        ":company_id" => $company_id
-    ]);
-    db_check($sth, $answer);
-
-    $output = $sth->fetch(PDO::FETCH_ASSOC);
-    
-    $answer["output"] = $output;
+    $answer["total_capacity"]  = $report->getTotalCapacity();
+    $answer["total_warehouse"] = $report->getTotalWarehouse();
     $answer["success"] = 1;
     exit(json_encode($answer));