trigger StockItemTrigger on Stock_Item__c(before insert, before delete) {





        /*set<string> stockItemNames = new Set<string>();

        for(Stock_Item__c newItems:trigger.new){
            stockItemNames.add(newItems.Item_Name__c);
        }
        if(stockItemNames.size()>0) {
            List<Stock_Item__c> oldItems =
            [Select Item_Name__c, Id
             From Stock_Item__c
             Where Item_Name__c IN: stockItemNames];
            ) {*/
        Map<Id,Stock_Item__c> duplicateMap = new Map<Id,Stock_Item__c>([
            Select Id,Item_Name__c
            From Stock_Item__c]);
        for(Stock_Item__c newItems: trigger.new){
            if(duplicateMap.containsKey(newItems.Item_Name__c)){
                newItems.Item_Name__c.addError('A stock item with this name already exists');
            }
        }

    }

   /* stockItemNames.add(newItems.Item_Name__c);

                 for(Stock_Item__c matchingItems:[
                     Select Item_Name__c, Id
                     From Stock_Item__c
                     Where Item_Name__c = :stockItemNames])

                 stockItemNames.add(matchingItems.Item_Name__c);

                 for(Stock_Item__c stockItemNames : duplicateItems){
                     //If(matchingItems.size()>0){
                      if(newItems.Item_Name__c == matchingItems.Item_Name__c){
                         newItems.Item_Name__c = newItems.Item_Name__c + 'Duplicate Item';

                     //optional solution that gives user an error and doesn't insert new recod
                     //newItems.addError('There is already a stock item with this name.  The record cannot be created.');
                     }
                 }
                   {

                 }
         }


        //if(Trigger.isInsert){
            //StockItemDupCheck_2.stockItemDupCheck(Trigger.new);
       // }
        //else if(Trigger.isUpdate){
            //StockItemDupCheck_2.stockItemDupCheck(Trigger.new);
            //
            */



    if(Trigger.isDelete && Trigger.isBefore) {
        List<Case> newCases = new List<Case>();


        Id runningUserId = UserInfo.getUserId();
        List<Stock_Item__c> sIventory = new List<Stock_Item__c>();

        for (Stock_Item__c item : Trigger.old) {

            if (item.stock_on_hand__c != 0 ) {
                //create a case

                Case c = new Case();
                c.Type = 'Other';
                c.Reason = 'Inventory';
                c.recordtypeID = '0121N000000o82k';
                c.Origin = 'Stock Item Check';
                c.Subject = Item.Item_Name__c + ': Check Stock Item for accurate inventory';
                c.Description = 'Stock Item Name: ' + Item.Item_Name__c + ' with Stock on hand = '+ item.Stock_on_hand__c + ', is requested for deletion. Please retrieve from the Recycle Bin if Stock Item is needed.';
                c.Deleted_Inventory_ID__c = item.ID;
                newCases.add(c);
                //item.addError('You can not delete a Stock Item with Inventory');
            }
        }
        insert newCases;
        System.debug('new case has been created.'+newcases);


    }
}