feat: Sentiment Analysis (#7475)

enterprise/app/models/enterprise/message.rb

@@ -0,0 +1,5 @@
+module Enterprise::Message
+  def update_message_sentiments
+    ::Enterprise::SentimentAnalysisJob.perform_later(self)
+  end
+end

enterprise/app/models/enterprise/sentiment_analysis_helper.rb

@@ -0,0 +1,45 @@
+module Enterprise::SentimentAnalysisHelper
+  extend ActiveSupport::Concern
+
+  included do
+    def opening_sentiments
+      records = incoming_messages.first(average_message_count)
+      average_sentiment(records)
+    end
+
+    def closing_sentiments
+      return unless resolved?
+
+      records = incoming_messages.last(average_message_count)
+      average_sentiment(records)
+    end
+
+    def average_sentiment(records)
+      {
+        label: average_sentiment_label(records),
+        score: average_sentiment_score(records)
+      }
+    end
+
+    private
+
+    def average_sentiment_label(records)
+      value = records.pluck(:sentiment).sum { |a| a['value'].to_i }
+      value.negative? ? 'negative' : 'positive'
+    end
+
+    def average_sentiment_score(records)
+      total = records.pluck(:sentiment).sum { |a| a['score'].to_f }
+      total / average_message_count
+    end
+
+    def average_message_count
+      # incoming_messages.count >= 10 ? 5 : ((incoming_messages.count / 2) - 1)
+      5
+    end
+
+    def incoming_messages
+      messages.incoming.where(private: false)
+    end
+  end
+end