trigger CreateOfferChatter on customobject__c (after Insert) {

  Set<Id> offerIds = new Set<Id>();  
  
  for(customobject__c offer : Trigger.new){
  
      offerIds.add(offer.id);
  }
  
  Map<Id, customobject__c> map_offer =  new Map<Id, customobject__c>([select id, name, LS_Project__r.Name from offer__c where id IN: offerIds]);

  for(customobject__c offer : Trigger.new){
  
    system.debug('@@Trigger Map : ' + map_offer );
    system.debug('@@Trigger Map values : ' + map_offer.values() );
    
    customobject__c offermap = map_offer.get(offer.id);
    system.debug('@@TRigger offermap  : ' + offermap );
    String feedMessage = ' New offer has been created for LS project : ' + offermap.LS_Project__r.Name;
    ConnectApi.MessageBodyInput messageInput = new ConnectApi.MessageBodyInput();
        messageInput.messageSegments = new List<ConnectApi.MessageSegmentInput>();
        ConnectApi.FeedItemInput inputdata = new ConnectApi.FeedItemInput();
        ConnectApi.TextSegmentInput textSegment = new ConnectApi.TextSegmentInput();
        String finalTextSeg = feedMessage;
            //Adding (@mention) in chatter
            
         String userToMention = UserInfo.GetUSerId();
         ConnectApi.MentionSegmentInput mentionSegment = new ConnectApi.MentionSegmentInput();
         mentionSegment.id = userToMention;
         messageInput.messageSegments.add(mentionSegment);
        ////Adding feed message in chatter
        textSegment.text = finalTextSeg;
        messageInput.messageSegments.add(textSegment);        
        inputdata.body = messageInput;
        inputdata.feedElementType = ConnectApi.FeedElementType.FeedItem;
        inputdata.subjectId = (String) offer.id;        
        try{
         
          ConnectApi.FeedElement feedElement = ConnectApi.ChatterFeeds.postFeedElement(null, inputdata);

        }
        catch(Exception e){
          System.debug('Exception : ' + e);
        } 
  }


}