feat(facebook): use HUMAN_AGENT tag for Messenger replies when human-agent config is enabled (#13690)

This PR updates Facebook Messenger outbound tagging in Chatwoot to
support Human Agent messaging when enabled.

Previously, Facebook outbound text and attachment messages were always
sent with:

```
messaging_type: MESSAGE_TAG
tag: ACCOUNT_UPDATE
```
With this change, the tag is selected dynamically:

```
HUMAN_AGENT when ENABLE_MESSENGER_CHANNEL_HUMAN_AGENT is enabled
ACCOUNT_UPDATE as fallback when the flag is disabled
```

app/services/facebook/send_on_facebook_service.rb

@@ -49,7 +49,7 @@ class Facebook::SendOnFacebookService < Base::SendOnChannelService
       recipient: { id: contact.get_source_id(inbox.id) },
       message: fb_text_message_payload,
       messaging_type: 'MESSAGE_TAG',
-      tag: 'ACCOUNT_UPDATE'
+      tag: message_tag
     }
   end
 
@@ -90,10 +90,14 @@ class Facebook::SendOnFacebookService < Base::SendOnChannelService
         }
       },
       messaging_type: 'MESSAGE_TAG',
-      tag: 'ACCOUNT_UPDATE'
+      tag: message_tag
     }
   end
 
+  def message_tag
+    @message_tag ||= GlobalConfigService.load('ENABLE_MESSENGER_CHANNEL_HUMAN_AGENT', nil) ? 'HUMAN_AGENT' : 'ACCOUNT_UPDATE'
+  end
+
   def attachment_type(attachment)
     return attachment.file_type if %w[image audio video file].include? attachment.file_type
 

spec/services/facebook/send_on_facebook_service_spec.rb

@@ -7,6 +7,7 @@ describe Facebook::SendOnFacebookService do
     allow(Facebook::Messenger::Subscriptions).to receive(:subscribe).and_return(true)
     allow(bot).to receive(:deliver).and_return({ recipient_id: '1008372609250235', message_id: 'mid.1456970487936:c34767dfe57ee6e339' }.to_json)
     create(:message, message_type: :incoming, inbox: facebook_inbox, account: account, conversation: conversation)
+    GlobalConfig.clear_cache
   end
 
   let!(:account) { create(:account) }
@@ -90,6 +91,17 @@ describe Facebook::SendOnFacebookService do
                                                     }, { page_id: facebook_channel.page_id })
       end
 
+      it 'sends with HUMAN_AGENT tag when ENABLE_MESSENGER_CHANNEL_HUMAN_AGENT is enabled' do
+        with_modified_env ENABLE_MESSENGER_CHANNEL_HUMAN_AGENT: 'true' do
+          message = create(:message, message_type: 'outgoing', inbox: facebook_inbox, account: account, conversation: conversation)
+          described_class.new(message: message).perform
+          expect(bot).to have_received(:deliver).with(
+            hash_including(tag: 'HUMAN_AGENT'),
+            { page_id: facebook_channel.page_id }
+          )
+        end
+      end
+
       it 'if message is sent with multiple attachments' do
         message = build(:message, content: nil, message_type: 'outgoing', inbox: facebook_inbox, account: account, conversation: conversation)
         avatar = message.attachments.new(account_id: message.account_id, file_type: :image)