public class Controller {
    
    // This method is called when a new ContentDocument is inserted
    public static void ControllerMethod(List<ContentDocument> cdlist) {
        try {
            String cdid = '', Title = '';
            // Iterating over the inserted ContentDocuments
            for (ContentDocument cd : cdlist) {
                cdid = cd.Id;
                Title = cd.Title;
            }
            // Debugging the data
            system.debug('@@@@ getting data' + cdlist + 'ontent Document id:' + cdid);
            // Calling the checkDoc method with the Id and Title of the last ContentDocument in the list
            Controller.checkDoc(cdid, Title);
        } catch (Exception e) {
            system.debug('Error in ControllerMethod: ' + e);
        }
    }
    
    // This future method is used to perform operations that need to be done asynchronously
    @future
    public static void checkDoc(String docId, String Title) {
        try {
            // Fetching all ContentDocumentLink records associated with the given ContentDocument Id
            List<ContentDocumentLink> cdlList = [SELECT Id,LinkedEntityId FROM ContentDocumentLink WHERE ContentDocumentId = :docId];
            system.debug('@@@@@ ContentDocumentLink Record:' + cdlList+'Title of content document:'+ Title);
            
            List<Id> LinkedEntyId = new List<Id>();
            // Extracting the LinkedEntityIds from the fetched ContentDocumentLink records
            for (ContentDocumentlink cd1 : cdlList) {
                LinkedEntyId.add(cd1.LinkedEntityId);
            }
            system.debug('@@@@@ LinkedEntityId' + LinkedEntyId);
            
            // Fetching all Contact records associated with the LinkedEntityIds
            List<Contact> cList = [SELECT Id, LastName, Profile_Image__c, Image_url__c, Description FROM Contact WHERE Id = :LinkedEntyId];
            system.debug('Contact list where attachment is added' + cList);
            
            // Fetching the ContentVersion record associated with the given ContentDocument Id
            ContentVersion cv = [SELECT Id, ContentBodyId FROM ContentVersion WHERE ContentDocumentId = :docId];
            system.debug('@@@@@ contentVersion records:' + cv);
            
            List<Contact> updatedContacts = new List<Contact>();
            for (Contact contact : cList) {
                if (Title.containsIgnoreCase('Profile')) {
                    // If the title of the document contains 'Profile', updating the Image_url__c and Description fields of the Contact record
                    contact.Image_url__c = 'https://suprnova-dev-ed.develop.file.force.com/sfc/servlet.shepherd/version/renditionDownload?rendition=ORIGINAL_Jpg&versionId=' + cv.Id + '&operationContext=CHATTER&contentId=' + cv.ContentBodyId;
                    contact.Description = 'Profile Photo Updated';
                } 
                updatedContacts.add(contact);
            }
            // Updating the Contact records
            update updatedContacts;
            
        } catch (Exception e) {
            system.debug('Error in checkDoc: ' + e);
        }
    }
    static Id linkedEntityId;
    
    // This method is called when a ContentDocument is deleted
    public static void deletemethod(List<ContentDocument> cdlist){
        
        String oldId='';
        // Iterating over the deleted ContentDocuments
        for(ContentDocument p:cdlist){
            oldId=p.Id;
        }
        system.debug('@@@@@ deleted document id:'+oldId);
        ContentDocumentLink cdl = [SELECT LinkedEntityId FROM ContentDocumentLink WHERE ContentDocumentId = :oldId LIMIT 1];
        system.debug('@@@@@cdl:'+cdl);
        linkedEntityId = cdl.LinkedEntityId;
        system.debug('@@@@@linkedEntityId:'+linkedEntityId);
        
        // Calling the checkDoc2 method with the Id of the last deleted ContentDocument in the list
        Controller.checkDoc2(linkedEntityId);
    }
    
    // This future method is used to perform operations that need to be done asynchronously after a ContentDocument is deleted
    @future
    public static void checkDoc2(Id linkedEntityId){  
        
        try{     
            system.debug('Entered In delete Method'+linkedEntityId);
            
            // Fetching the LinkedEntityId from the ContentDocumentLink record associated with the given ContentDocument Id
            // ContentDocumentLink odlEntityId=[SELECT LinkedEntityId FROM ContentDocumentLink WHERE ContentDocumentId=:docId2];
            // system.debug('@@@@@ linked entity id:'+odlEntityId);
            
            // Fetching all ContentDocuments related to the same Contact as the deleted document
            ContentDocumentLink allRelatedCd=[SELECT ContentDocumentId FROM  ContentDocumentLink WHERE LinkedEntityId=:linkedEntityId];
            system.debug('###allRelatedCd'+allRelatedCd);
            List<ContentDocument> idTitles=[SELECT Id,Title FROM ContentDocument WHERE Id=:allRelatedCd.ContentDocumentId ];
            List<Id>idofProfile=new List<Id>();
            
            for(ContentDocument vb:idTitles){
                if(vb.Title.containsIgnoreCase('Profile')){
                    idofProfile.add(vb.Id);
                }
            }
            system.debug('@@@@@ idofProfile'+idofProfile);
            
            // Fetching the latest ContentDocument with a title containing 'Profile'
            ContentDocument contentList0=[SELECT Id,Title FROM ContentDocument WHERE Id =:idofProfile ORDER BY CreatedDate DESC LIMIT 1];
            system.debug('@@@@@ ids of profile named files:'+ contentList0);
            
            List<Contact> updatedContacts = new List<Contact>();
            // Fetching all Contact records associated with the LinkedEntityId
            List<Contact>cList=[SELECT Id,LastName,Profile_Image__c,Image_url__c,Description FROM Contact WHERE Id =:linkedEntityId];
            system.debug('Contact list where attachment is added'+cList);
            // Storing the Id and title of the fetched ContentDocument
            if(contentList0!=null){
                String profileid=contentList0.Id;
                String Title=contentList0.Title;
                
                
                
                system.debug('@@@@@ List of ids:'+profileid);
                system.debug('@@@@@ List of ids:'+Title);
                
                // Fetching the LinkedEntityId from the ContentDocumentLink record associated with the fetched ContentDocument
                //List<ContentDocumentLink>cdLinkList=[SELECT Id,LinkedEntityId FROM ContentDocumentLink WHERE ContentDocumentId=:profileid];
                
                // String entityId='';
                //for(ContentDocumentLink cdo:cdLinkList){
                //    entityId=cdo.LinkedEntityId;
                //}
                //system.debug('@@@@ linked entity id :'+ entityId);
                
                
                
                // Fetching the ContentVersion record associated with the fetched ContentDocument
                ContentVersion cv = [SELECT Id,ContentBodyId FROM ContentVersion WHERE ContentDocumentId = :profileid];
                system.debug('@@@@@ contentVersion records:'+cv);
                
                
                // Updating the Contact records
                for (Contact contact : cList) {
                    contact.Image_url__c='https://suprnova-dev-ed.develop.file.force.com/sfc/servlet.shepherd/version/renditionDownload?rendition=ORIGINAL_Jpg&versionId='+cv.Id+'&operationContext=CHATTER&contentId='+cv.ContentBodyId;
                    contact.Description = 'previous profile photo updated';
                    updatedContacts.add(contact);
                }
                
            }
            else{
                for (Contact contact : cList) {
                    contact.Image_url__c='No profile';
                    contact.Description = 'No previous profile ';
                    updatedContacts.add(contact);
                }
            }
            update updatedContacts;
        }
        
        catch(Exception e){
            System.debug('@@@@@@  error:'+e);
        }
    }
    
}