feat: Add APIs for Dialogflow integration V1 (#2155)

Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>
Co-authored-by: Pranav Raj S <pranav@chatwoot.com>

spec/lib/integrations/dialogflow/processor_service_spec.rb

@@ -0,0 +1,73 @@
+require 'rails_helper'
+
+describe Integrations::Dialogflow::ProcessorService do
+  let(:account) { create(:account) }
+  let(:hook) { create(:integrations_hook, app_id: 'dialogflow', account: account) }
+  let(:conversation) { create(:conversation, account: account, status: :bot) }
+  let(:message) { create(:message, account: account, conversation: conversation) }
+  let(:event_name) { 'message.created' }
+  let(:event_data) { { message: message } }
+
+  describe '#perform' do
+    let(:dialogflow_service) { double }
+    let(:dialogflow_response) do
+      ActiveSupport::HashWithIndifferentAccess.new(
+        fulfillment_text: 'hello'
+      )
+    end
+
+    let(:processor) { described_class.new(event_name: event_name, hook: hook, event_data: event_data) }
+
+    before do
+      allow(dialogflow_service).to receive(:query_result).and_return(dialogflow_response)
+      allow(processor).to receive(:get_dialogflow_response).and_return(dialogflow_service)
+    end
+
+    context 'when valid message and dialogflow returns fullfillment text' do
+      it 'creates the response message' do
+        expect(processor.perform.content).to eql('hello')
+      end
+    end
+
+    context 'when dialogflow returns fullfillment text to be empty' do
+      let(:dialogflow_response) do
+        ActiveSupport::HashWithIndifferentAccess.new(
+          fulfillment_messages: [{ payload: { content: 'hello payload' } }]
+        )
+      end
+
+      it 'creates the response message based on fulfillment messages' do
+        expect(processor.perform.content).to eql('hello payload')
+      end
+    end
+
+    context 'when dialogflow returns action' do
+      let(:dialogflow_response) do
+        ActiveSupport::HashWithIndifferentAccess.new(
+          fulfillment_messages: [{ payload: { action: 'handoff' } }]
+        )
+      end
+
+      it 'handsoff the conversation to agent' do
+        processor.perform
+        expect(conversation.status).to eql('open')
+      end
+    end
+
+    context 'when conversation is not bot' do
+      let(:conversation) { create(:conversation, account: account, status: :open) }
+
+      it 'returns nil' do
+        expect(processor.perform).to be(nil)
+      end
+    end
+
+    context 'when message is private' do
+      let(:message) { create(:message, account: account, conversation: conversation, private: true) }
+
+      it 'returns nil' do
+        expect(processor.perform).to be(nil)
+      end
+    end
+  end
+end