feat: Reply suggestion and summary generation using OpenAI (#7029)

Add `reply_suggestions` and `summary_generation` options for OpenAI integration

Fixes: https://linear.app/chatwoot/issue/CW-1595/frontend-for-generating-conversation-summary

Co-authored-by: Nithin David Thomas <1277421+nithindavid@users.noreply.github.com>
Co-authored-by: Sojan Jose <sojan@pepalo.com>

lib/integrations/openai/processor_service.rb

@@ -35,20 +35,48 @@ class Integrations::Openai::ProcessorService
   end
 
   def conversation_messages(in_array_format: false)
-    conversation = hook.account.conversations.find_by(display_id: event['data']['conversation_display_id'])
-    messages = in_array_format ? [] : ''
+    conversation = find_conversation
+    messages = init_messages_body(in_array_format)
+
+    add_messages_until_token_limit(conversation, messages, in_array_format)
+  end
+
+  def find_conversation
+    hook.account.conversations.find_by(display_id: event['data']['conversation_display_id'])
+  end
+
+  def add_messages_until_token_limit(conversation, messages, in_array_format)
     character_count = 0
-
     conversation.messages.chat.reorder('id desc').each do |message|
-      character_count += message.content.length
-      break if character_count > TOKEN_LIMIT
-
-      formatted_message = format_message(message, in_array_format)
-      messages.prepend(formatted_message)
+      character_count, message_added = add_message_if_within_limit(character_count, message, messages, in_array_format)
+      break unless message_added
     end
     messages
   end
 
+  def add_message_if_within_limit(character_count, message, messages, in_array_format)
+    if valid_message?(message, character_count)
+      add_message_to_list(message, messages, in_array_format)
+      character_count += message.content.length
+      [character_count, true]
+    else
+      [character_count, false]
+    end
+  end
+
+  def valid_message?(message, character_count)
+    message.content.present? && character_count + message.content.length <= TOKEN_LIMIT
+  end
+
+  def add_message_to_list(message, messages, in_array_format)
+    formatted_message = format_message(message, in_array_format)
+    messages.prepend(formatted_message)
+  end
+
+  def init_messages_body(in_array_format)
+    in_array_format ? [] : ''
+  end
+
   def format_message(message, in_array_format)
     in_array_format ? format_message_in_array(message) : format_message_in_string(message)
   end