public class EventTriggerHandler {
	public static void addSubject(List<Event> lstevent){
		Set<Id> setOfConId = new Set<Id>();
        Set<Id> setOfEventid = New Set<Id>();
        List<Event>lstUpadteEvent = new List<Event>();
        Map<Id,Contact> MapOfIdToCon = New Map<id,contact>();
        for(Event objevent : lstevent){
                if(objevent.WhoId != null && objevent.WhoId.getSObjectType().getDescribe().getName() == 'Contact' && objevent.Subject == null && (objevent.Type__c == 'Candidate Meeting (Internal Interview)' || objevent.Type__c == 'Candidate Meeting (Interview Debrief)' || objevent.Type__c == '	Candidate Meeting (Other)' || objevent.Type__c == 'Client Interview (Direct Hire)' || objevent.type__c == 'Client Meeting (Intake)' || objevent.type__c == 'Client Meeting (Interview Debrief)' || objevent.type__c == 'Client Meeting (Other)' || objevent.type__c == 'Client Meeting (PEM)' || objevent.type__c == 'Client Meeting (Prospecting)' || objevent.type__c == 'Internal Meeting' || objevent.type__c == 'Networking Event' || objevent.type__c == 'Partner/Referral Meeting' || objevent.type__c == 'Vendor Meeting' || objevent.type__c == 'Vendor Prospect Meeting')){
                    setOfConId.add(objevent.WhoId);
                    setOfEventid.add(objevent.Id);
                }
         }
         System.debug('<---setOfEventid--->'+setOfEventid);
         System.debug('<---setOfConId---->'+setOfConId);
         for(Contact objConatct : [Select Id,Name,Current_Title__c,Current_Company__c,Account.Name from Contact where Id IN:setOfConId]){
            if(objConatct.Name != null || objConatct.Current_Title__c != null || objConatct.Current_Company__c != null || objConatct.Account.Name != null){
                 MapOfIdToCon.put(objConatct.id, objConatct);
            }
         }
         System.debug('<---MapOfIdToCon--->'+MapOfIdToCon);
        for(Event objevent : [Select Id,WhoId,Owner.Name,Subject,Type__c from Event where Id IN:setOfEventid]){
            if(MapOfIdToCon.containsKey(objevent.WhoId) && (objevent.Type__c == 'Candidate Meeting (Internal Interview)' || objevent.Type__c == 'Candidate Meeting (Interview Debrief)' || objevent.Type__c == 'Candidate Meeting (Other)')){
                objevent.Subject = (MapOfIdToCon.get(objevent.WhoId).Name == null ? ' ' : MapOfIdToCon.get(objevent.WhoId).Name)+','+ +(MapOfIdToCon.get(objevent.whoId).Current_Title__c == null ? ' ' : MapOfIdToCon.get(objevent.whoId).Current_Title__c)+','+' '+(MapOfIdToCon.get(objevent.WhoId).Current_Company__c == null ? ' ' : (MapOfIdToCon.get(objevent.WhoId).Current_Company__c))+' '+'&'+' '+(objevent.Owner.Name == null ? ' ' :objevent.Owner.Name)+','+' '+(objevent.Type__c == null ? ' ' :objevent.Type__c); 
    			System.debug('<---subject-->'+objevent.Subject);
                lstUpadteEvent.add(objevent);
            }
            else if(MapOfIdToCon.containsKey(objevent.WhoId) && (objevent.Type__c == 'Client Interview (Direct Hire)' || objevent.type__c == 'Client Meeting (Intake)' || objevent.type__c == 'Client Meeting (Interview Debrief)' || objevent.type__c == 'Client Meeting (Other)' || objevent.type__c == 'Client Meeting (PEM)' || objevent.type__c == 'Client Meeting (Prospecting)' || objevent.type__c == 'Internal Meeting' || objevent.type__c == 'Networking Event' || objevent.type__c == 'Partner/Referral Meeting' || objevent.type__c == 'Vendor Meeting' || objevent.type__c == 'Vendor Prospect Meeting')){
                    objevent.Subject = objevent.Subject = (MapOfIdToCon.get(objevent.WhoId).Name == null ? ' ' : MapOfIdToCon.get(objevent.WhoId).Name)+','+ +(MapOfIdToCon.get(objevent.whoId).Current_Title__c == null ? ' ' : MapOfIdToCon.get(objevent.whoId).Current_Title__c)+','+' '+(MapOfIdToCon.get(objevent.WhoId).Account.Name == null ? ' ' : (MapOfIdToCon.get(objevent.WhoId).Account.Name))+' '+'&'+' '+(objevent.Owner.Name == null ? ' ' :objevent.Owner.Name)+','+' '+(objevent.Type__c == null ? ' ' :objevent.Type__c); 
					System.debug('<---subject-->'+objevent.Subject);
					lstUpadteEvent.add(objevent);
            }
        }
        //Event Before update
        System.debug('<--Before lstUpadteEvent--->'+lstUpadteEvent);
        if(lstUpadteEvent.size() > 0){
            update lstUpadteEvent;
        }
        //Event After Update
        System.debug('<---After lstUpadteEvent---->'+lstUpadteEvent);
	} 
}

@isTest
public class EventTriggerhandlerTest {
    Static testmethod void Method1(){
        //Insertion of Account
        Account objacc				 		= New Account();
        objacc.Name					 		= 'test';
        objacc.Company_Allocation__c 		= 'New';
        objacc.Type__c 				 		= 'Client';
        objacc.Market__c 			 		= 'Boston';
        objacc.Industry__c 			 		= 'agriculture';
		objacc.Physical_City__c 	 		= 'Test';
        objacc.Physical_State_Province__c   = 'Test';
        
        // Account DML
        insert objacc;
        
        //Insertion of contact
        Contact objContact 	       			= new Contact();
        objContact.AccountId				= objacc.Id;
        objContact.LastName					= 'Testing Trigger 1';
        objContact.Contact_Type__c 			= 'Not DM';
        objContact.Contact_Allocation__c 	= 'New';
        objContact.Title					= 'Test 1';
        objContact.Linked_In_URL__c 		= '@#$$';
        objContact.Functional_Area__c 		= 'Accounting';
        objContact.Title_Level__c			= 'Accounting Director';
        objContact.Database_Sourced__c 		= 'Rahul Merani';
        objContact.Current_Title__c         = 'Test';
        objContact.Current_Company__c		= 'Test Comp';
        
        //Contact DMl
        Insert objContact;
        
        //Insertion of event
        
        Event objevent = New Event();
        objevent.StartDateTime = System.today();
        objEvent.EndDateTime = System.today();
        objEvent.WhoId = objevent.Id;
        objEvent.Type__c = 'Candidate Meeting (Internal Interview)';
        insert objevent;
    }
}