Implement copilot review comments

Author: esrakartalOpt

lib/optimizely/event/entity/event_batch.rb

@@ -48,7 +48,7 @@ def build
         event_batch.anonymize_ip = @anonymize_ip
         event_batch.enrich_decisions = @enrich_decisions
         event_batch.visitors = @visitors
-        event_batch.region = @region || 'US'
+        event_batch.region = @region.nil? || 'US': @region
         event_batch
       end
 

lib/optimizely/event/event_factory.rb

@@ -72,7 +72,7 @@ def create_log_event(user_events, logger)
         builder.with_visitors(visitors)
         event_batch = builder.build
 
-        endpoint = ENDPOINTS[user_context[:region].to_sym] || ENDPOINTS[:US]
+        endpoint = ENDPOINTS[user_context[:region].to_s.upcase.to_sym] || ENDPOINTS[:US]
 
         Event.new(:post, endpoint, event_batch.as_json, POST_HEADERS)
       end

lib/optimizely/event_builder.rb

@@ -131,7 +131,7 @@ def create_impression_event(project_config, experiment, variation_id, user_id, a
       impression_params = get_impression_params(project_config, experiment, variation_id)
       event_params[:visitors][0][:snapshots].push(impression_params)
 
-      endpoint = ENDPOINTS[region.to_sym]
+      endpoint = ENDPOINTS[region.to_s.upcase.to_sym]
 
       Event.new(:post, endpoint, event_params, POST_HEADERS)
     end
@@ -152,7 +152,7 @@ def create_conversion_event(project_config, event, user_id, attributes, event_ta
       conversion_params = get_conversion_params(event, event_tags)
       event_params[:visitors][0][:snapshots] = [conversion_params]
 
-      endpoint = ENDPOINTS[region.to_sym]
+      endpoint = ENDPOINTS[region.to_s.upcase.to_sym]
 
       Event.new(:post, endpoint, event_params, POST_HEADERS)
     end