public class DTCI_Attendee_AB_Ctrl {
    
    //Variables
    private CnP_PaaS_EVT__Event_attendee_session__c attendee; 

    // object variables for new attendees checking in   
        public String registrantId {get; set;}   
        public String ticketLevelId {get; set;}
        ...(other fields)
     
// additional var for Checked In attendees updating existing record, some values set by collecting URL parameters in the Contructor, other variables should pre-populate the Attendee Info form when it loads
        public String checkIn {get; set;}        
        public String attendeeId {get; set;}     
        public String attendeeFirstName {get; set;}     
        public String attendeeLastName {get; set;} 
        ... (other fields)

 //Constructor
    public DTCI_Attendee_AB_Ctrl(ApexPages.StandardController controller) {         
       attendee = (CnP_PaaS_EVT__Event_attendee_session__c) controller.getRecord();
        
        // New Attendees Checking In       
        ticketLevelId = ApexPages.currentPage().getParameters().get('ticketLevelId');
        isMinorStr = ApexPages.currentPage().getParameters().get('isMinorStr');

        //... if(){} that uses isMinorStr value to determine release type
        
        // additional var for Checked In attendees updating existing record
        attendeeId = ApexPages.currentPage().getParameters().get('attendeePageId');
        checkIn = ApexPages.currentPage().getParameters().get('checkIn');
        
        if(checkIn =='Complete' ){
        for(CnP_PaaS_EVT__Event_attendee_session__c att : [SELECT CnP_PaaS_EVT__EventId__r.CnP_PaaS_EVT__category__r.name FROM CnP_PaaS_EVT__Event_attendee_session__c WHERE Id =: attendeeId])
                     attendee = att;
        }



// Find the next registrant ticket of the same ticket type to select record to save values 

 public static List<CnP_PaaS_EVT__Event_attendee_session__c> nextAvailableTicket(String registrantId, String ticketLevelId) {
            List<CnP_PaaS_EVT__Event_attendee_session__c> nextAvailableTicket = [SELECT Id,                                                             
                CnP_PaaS_EVT__First_name__c,
                CnP_PaaS_EVT__Last_name__c,
            ...(other fields)
                                       
                            FROM CnP_PaaS_EVT__Event_attendee_session__c                                                                           
                            WHERE CnP_PaaS_EVT__Registrant_session_Id__c =:registrantId
                            AND CnP_PaaS_EVT__Registration_level__c =:ticketLevelId         
                            AND DTCI_Attendee_Info_Entered__c = FALSE
                            AND DTCI_Agreement_Active__c = FALSE
                            ORDER BY DTCI_Ticket_Order__c
                            LIMIT 1
                            ];
                            
                        return nextAvailableTicket;
        }  

public PageReference saveAttendee(){
            
            if(String.isBlank(attendeeId)){

                for (CnP_PaaS_EVT__Event_attendee_session__c firstResult : nextAvailableTicket(registrantId, ticketLevelId)) {
                     attendee = firstResult;
                     if (isMinor == true){
                        releaseType = 'Minor Visitor';
                        } else {
                        releaseType = 'Adult Visitor';    
                        }                    
                    break;
                    }
                }    
                                                             
        attendee.CnP_PaaS_EVT__First_name__c = attendeeFirstName;
        attendee.CnP_PaaS_EVT__Last_name__c = attendeeLastName ;
       ... (other fields)
        attendee.DTCI_Release_Type__c = releaseType;

        // last variable sets a checkbox field to checked so this ticket is no longer available for the nextAvailableTicket
        attendee.DTCI_Attendee_Info_Entered__c = attendeeInfoEntered;

       update attendee;
                                               
        PageReference sendToReleaseForm = new PageReference('/apex/DTCI_Release_Form_Page_AB' + '?attendeePageId=' + attendee.id + '&registrantPageId=' + registrantId + '&eventPageId=' + eventId + '&releasePageType=' + releaseType);  

       sendToReleaseForm.setRedirect(true);                        
       return sendToReleaseForm;
            
    } 

// functions for the Minor Question page, these originally included a query that updated the releaseType based on the response, and thus cause the overlap at check-in

       public PageReference minorYes(){...} 
       public PageReference minorYes(){..}    

  }