feat: Add support for Whatsapp template messages in the UI (#4711)

Co-authored-by: Pranav Raj S <pranav@chatwoot.com>

app/services/whatsapp/send_on_whatsapp_service.rb

@@ -6,16 +6,18 @@ class Whatsapp::SendOnWhatsappService < Base::SendOnChannelService
   end
 
   def perform_reply
-    # can reply checks if 24 hour limit has passed.
-    if message.conversation.can_reply?
-      send_on_whatsapp
-    else
+    should_send_template_message = template_params.present? || !message.conversation.can_reply?
+    if should_send_template_message
       send_template_message
+    else
+      send_session_message
     end
   end
 
   def send_template_message
+    channel.sync_templates
     name, namespace, lang_code, processed_parameters = processable_channel_message_template
+
     return if name.blank?
 
     message_id = channel.send_template(message.conversation.contact_inbox.source_id, {
@@ -28,6 +30,16 @@ class Whatsapp::SendOnWhatsappService < Base::SendOnChannelService
   end
 
   def processable_channel_message_template
+    if template_params.present?
+      return [
+        template_params['name'],
+        template_params['namespace'],
+        template_params['language'],
+        template_params['processed_params'].map { |_, value| { type: 'text', text: value } }
+      ]
+    end
+
+    # Delete the following logic once the update for template_params is stable
     # see if we can match the message content to a template
     # An example template may look like "Your package has been shipped. It will be delivered in {{1}} business days.
     # We want to iterate over these templates with our message body and see if we can fit it to any of the templates
@@ -78,8 +90,12 @@ class Whatsapp::SendOnWhatsappService < Base::SendOnChannelService
     template['components'].find { |obj| obj['type'] == 'BODY' && obj.key?('text') }
   end
 
-  def send_on_whatsapp
+  def send_session_message
     message_id = channel.send_message(message.conversation.contact_inbox.source_id, message)
     message.update!(source_id: message_id) if message_id.present?
   end
+
+  def template_params
+    message.additional_attributes && message.additional_attributes['template_params']
+  end
 end