public with sharing class TaskTriggerHandler {
    
    private boolean trigger_isExecuting = false;
    
    public TaskTriggerHandler(){
        
    }
    
    public void OnAfterInsert(Task[] newObjects){
        // EXECUTE AFTER INSERT LOGIC
        updateAccountActivityFields(newObjects);
    }
    
    public void OnAfterUpdate(Task[] oldObjects, Task[] updatedObjects, Map<ID, Task> ObjectMap){
        //EXECUTE AFTER UPDATE LOGIC
        updateAccountActivityFields(updatedObjects);
    }
    
    public void updateAccountActivityFields(Task[] taskRecords){
    /* when a task of RecordType(Safelite_Task_Record_Type) is created/updated either from Account or Contact then 
    update Account fields : Last_Face_to_Face_Activity__c, Last_Visited_By__c & Last_Call_Activity__c based on task type
    */
        // find task record type 
        RecordType taskRec = [SELECT Id FROM RecordType WHERE SobjectType ='Task' AND DeveloperName ='Safelite_Task_Record_Type'];
        
        //Set of Account IDs getting updated
        Set<ID> aid = new Set<ID>();
        List<Account> accountsToUpdate = new List<Account>();
        Account a;
        
        //Map of Account IDs and Accounts
        Map<id,account> accMap = new Map<id,account>();
        
        //Get all the contactIds and accountIds of the task being inserted/updated
        for(Task tk : [SELECT Id, LastModifiedBy.name, type, LastModifiedDate, CreatedDate, RecordTypeId, whoid, whatid FROM task WHERE id in :taskRecords]){
            if(tk.RecordTypeId == taskRec.Id  && tk.Whoid!=null){
                If( tk.WhatId!=null ){
                aid.add(tk.whatid); 
                a = new Account(id = tk.WhatId);
                
                //convert task's CreatedDate, datetime to date
                Date createdDateJustDate = date.newinstance(tk.CreatedDate.year(), tk.CreatedDate.month(), tk.CreatedDate.day());
                
                //update the activity fields on account with Task's lastModifiedDate and LastModifiedBy based on Task Type
                if(tk.type=='Face 2 Face Meeting' || tk.type=='Lunch'){
                    a.Last_Face_to_Face_Activity__c = createdDateJustDate;
                    a.Last_Visited_By__c = tk.LastModifiedBy.name;
                }
                else{
                    a.Last_Call_Activity__c =  createdDateJustDate;
                }
                //Populate accMap with the Account IDs and Account record
                accountsToUpdate.add(a);
                accMap.put(a.id,a);
				}
            }
        }
        if(!accMap.isEmpty()){
            Update accMap.values();
        }
    }
}