changes in stock module -vadivel J

app/Controllers/StockController.php

@@ -891,16 +891,37 @@ private function updateGasStockConsumption($date , $consumption){
               ->first();
         
         if($resultExists){
-
+            
             $resultExists['consumption'] = $resultExists['consumption']+($consumption);
+            $resultExists['balanceStock'] = $resultExists['opening'] - $resultExists['consumption'];
             $this->gasStockDetails_model->update($resultExists['id'],$resultExists);
-        }
-        else if(true){
-            //previous month stock to be subtracted with consumption if stock is present .
- 
+           
         }
         else{
 
+           
+
+            $previousMonthDate = new DateTime($date);
+            $previousMonthDate = $previousMonthDate->modify('first day of this month')
+                                                   ->modify('-1 day')
+                                                   ->format('Y-m-d');
+
+            
+        
+            $previousMonthResultExists = $this->gasStockDetails_model
+                  ->where('date',$previousMonthDate)
+                  ->first();
+
+                  
+
+            $opening = 0;
+
+                  if(!empty($previousMonthResultExists) && isset($previousMonthResultExists['balanceStock']) ){
+                    $opening =$previousMonthResultExists['balanceStock'];
+                  }
+
+            
+
             $startDate = DateTime::createFromFormat('Y-m-d', $date)->modify('first day of this month')->format('Y-m-d');
             $endDate =   DateTime::createFromFormat('Y-m-d', $date)->modify('last day of this month')->format('Y-m-d');
 
@@ -918,17 +939,28 @@ private function updateGasStockConsumption($date , $consumption){
             }
 
             foreach ($datesInMonth as $datesInMonthIndex => $dateInMonth) {
+
+                //update previousMonthResultExists
+                $balanceStock = $opening ;
+                $consumptionForDate = 0;
+                if($dateInMonth == $date){
+                    $consumptionForDate = $consumption;
+                    $balanceStock = $opening - $consumption ;
+                }
             
                 $inserts[] = [
                     'date'            => $dateInMonth,
-                    'opening'         => 0,
+                    'opening'         => $opening,
                     'purchaseBharath' => 0,
-                    'purchaseIndian'  => 0,
+                    'purchaseIndian'  => 0, 
                     'total'           => 0,
-                    'consumption'     => $dateInMonth == $date ? $consumption : 0 ,
-                    'balanceStock'    => 0
+                    'consumption'     => $consumptionForDate,
+                    'balanceStock'    => $balanceStock
                 ];
 
+                    $opening = $balanceStock;
+                
+
             }
 
             if(!empty($inserts)){