trigger UpdateAccountContactL1 on Case (before insert) {

    for(Case c : Trigger.new){    
        // Set profile IDs to exclude
        Set<Id> proIds = new Set<Id>{'00ea0000001p149', '00ea0000001p15L', '00ea0000001p14A'};       
        //Only process changes for Support record type with Account Name and Contact Name fields are blank        
           if(c.RecordTypeId == '012a00000018Ens' &&  (c.AccountId == null || c.ContactId == null)) {
                  // Get profile ID of Case Owner if Owner is not a Queue
                    User u = [SELECT ProfileId FROM User WHERE Id = :c.OwnerId]; 
                    // Process Account and Contact update if the User is one of the L1 profiles
  
            if(proIds.contains(u.ProfileId)){
                 List<Account> accList = [SELECT Id FROM Account WHERE Name = 'Generic Supplier'];         
                List<Contact> conList = [SELECT Id FROM Contact WHERE Name = 'Supplier Issue'];
                      c.AccountId = accList.isEmpty() ? null : accList[0].Id;
                     c.ContactId = conList.isEmpty() ? null : conList[0].Id;
            }
        }
    }
}

trigger UpdateAccountContactL1 on Case (before insert) {     
	//Get record type ID
    String rt;
    List<RecordType> rts = [Select Id, Name FROM RecordType Where Name = 'Support' limit 1];
    if(rts.isEmpty()==false){
        rt = rts[0].id;
    }
  
    //List of users where this could apply.. goes against 
    List<User> t1Agents = [SELECT id, ProfileId from User where User.Profile.Name like '%Support Tier 1%'];
    Set<Id> agents = new Set<Id>(); 
    if(t1Agents.isEmpty()==false){
        for(User agent: t1Agents){
           agents.add(agent.id); 
        }
    }
   
    // Set ids to assign
        String accId;
       	String conId;
    	 List<Contact> cons = [Select Id,  AccountId From Contact WHERE Contact.Name = 'Supplier Issue'  AND Account.Name = 'Generic Supplier'];
    	if(cons.isEmpty()==false){
        System.debug(cons[0]);
        accId = cons[0].AccountId;
        conId = cons[0].id
         }
  
    for(Case c : Trigger.new){
        
       if(c.RecordTypeId == rt &&  (c.AccountId == null || c.ContactId == null)) {
            // Get profile ID of Case Owner if Owner is not a Queue
              
            // Process Account and Contact update if the User is one of the Tier 1 profiles
           if(agents.contains(c.OwnerId)){
                c.AccountId = accId;
                c.ContactId = conId;
              }
        }
    }
}

List<Contact> cons = [Select Id,  AccountId From Contact WHERE Contact.Name = 'Supplier Issue'  AND Account.Name = 'Generic Supplier'];
System.debug(cons);