chore: GPT Reply suggestion & summarize endpoints (#7011)

Adds additional endpoints for OpenAI integration which will allow
- Reply Suggestions
- Summarization

ref: #6436
fixes: https://linear.app/chatwoot/issue/CW-1596/backend-for-generating-conversation-summary

spec/lib/integrations/openai/processor_service_spec.rb

@@ -3,19 +3,23 @@ require 'rails_helper'
 RSpec.describe Integrations::Openai::ProcessorService do
   subject { described_class.new(hook: hook, event: event) }
 
-  let(:hook) { create(:integrations_hook, :openai) }
+  let(:account) { create(:account) }
+  let(:hook) { create(:integrations_hook, :openai, account: account) }
   let(:expected_headers) { { 'Authorization' => "Bearer #{hook.settings['api_key']}" } }
   let(:openai_response) do
     {
       'choices' => [
         {
           'message' => {
-            'content' => 'This is a rephrased test message.'
+            'content' => 'This is a reply from openai.'
           }
         }
       ]
     }.to_json
   end
+  let!(:conversation) { create(:conversation, account: account) }
+  let!(:customer_message) { create(:message, account: account, conversation: conversation, message_type: :incoming, content: 'hello agent') }
+  let!(:agent_message) { create(:message, account: account, conversation: conversation, message_type: :outgoing, content: 'hello customer') }
 
   describe '#perform' do
     context 'when event name is rephrase' do
@@ -36,11 +40,60 @@ RSpec.describe Integrations::Openai::ProcessorService do
           .to_return(status: 200, body: openai_response, headers: {})
 
         result = subject.perform
-        expect(result).to eq('This is a rephrased test message.')
+        expect(result).to eq('This is a reply from openai.')
       end
     end
 
-    context 'when event name is not rephrase' do
+    context 'when event name is reply_suggestion' do
+      let(:event) { { 'name' => 'reply_suggestion', 'data' => { 'conversation_display_id' => conversation.display_id } } }
+
+      it 'returns the suggested reply' do
+        request_body = {
+          'model' => 'gpt-3.5-turbo',
+          'messages' => [
+            { role: 'system', content: 'Please suggest a reply to the following conversation between support agents and customer' },
+            { role: 'user', content: customer_message.content },
+            { role: 'assistant', content: agent_message.content }
+          ]
+        }.to_json
+
+        # Update the stub_request with the correct messages order
+        stub_request(:post, 'https://api.openai.com/v1/chat/completions')
+          .with(body: request_body, headers: expected_headers)
+          .to_return(status: 200, body: openai_response, headers: {})
+
+        result = subject.perform
+        expect(result).to eq('This is a reply from openai.')
+      end
+    end
+
+    context 'when event name is summarize' do
+      let(:event) { { 'name' => 'summarize', 'data' => { 'conversation_display_id' => conversation.display_id } } }
+      let(:conversation_messages) do
+        "Customer #{customer_message.sender.name} : #{customer_message.content}\nAgent #{agent_message.sender.name} : #{agent_message.content}\n"
+      end
+
+      it 'returns the summarized message' do
+        request_body = {
+          'model' => 'gpt-3.5-turbo',
+          'messages' => [
+            { 'role' => 'system',
+              'content' => 'Please summarize the key points from the following conversation between support agents and customer ' \
+                           'as bullet points for the next support agent looking into the conversation' },
+            { 'role' => 'user', 'content' => conversation_messages }
+          ]
+        }.to_json
+
+        stub_request(:post, 'https://api.openai.com/v1/chat/completions')
+          .with(body: request_body, headers: expected_headers)
+          .to_return(status: 200, body: openai_response, headers: {})
+
+        result = subject.perform
+        expect(result).to eq('This is a reply from openai.')
+      end
+    end
+
+    context 'when event name is not one that can be processed' do
       let(:event) { { 'name' => 'unknown', 'data' => {} } }
 
       it 'returns nil' do