trigger Trg_Property_Contact on Property__c (before update,after update) {
   String UserID = UserInfo.getUserId();
   list<contact> contactlist = new list<contact>();
   set<id> pset = new set<id>();
   map<id,contact> conmap = new map<id,Contact>();
       for (Property__c p : trigger.new){
           pset.add(p.Agent__c);
        }
   list<contact> conlist = [select id,name,Default_commission_split__c,Year_To_date_Total_Sales__c from contact where id in: pset];
    for(contact c : conlist){
           conmap.put(c.id, c);
    }
if(trigger.isbefore){
    for(property__c p1: trigger.new){
        if(p1.status__C =='Closed Pending Approval'|| p1.Status__c =='Closed Approved'){
          p1.Agent_Commission_Per__c = conmap.get(p1.Agent__c).Default_commission_split__c;
    }
}
   
}
if(trigger.isafter){
      set<id> myset = new set<id>();
      map<id,contact> cmap = new map<id,Contact>();
      list<contact> contactlist = new list<contact>();
          for (Property__c p : trigger.old){
               myset.add(p.Agent__c);
          }
   list<contact> conlist = [select id,name,Default_commission_split__c,Year_To_date_Total_Sales__c from contact where id in: myset];
       for(contact ct : conlist){
           cmap.put(ct.id, ct);
          }
       for(property__c p3: trigger.old){
        if(p3.status__C =='Closed Pending Approval'){
            if(cmap.containskey(p3.Agent__c)){
               contact c1 = cmap.get(p3.Agent__c); 
               c1.Year_To_date_Total_Sales__c = c1.Year_To_date_Total_Sales__c + p3.Sales_price__c;
            }
    }
  }
    update contactlist;
}
}