stub out active_music_sessions#ams_index

ruby/lib/jam_ruby/models/active_music_session.rb

@@ -314,6 +314,73 @@ module JamRuby
       return query
     end
 
+    # Generate a list of active music sessions filtered by genre, language, keyword, and sorted
+    # (and tagged) by rsvp'd (1st), invited (2nd), and musician can join (3rd). within a group
+    # tagged the same, sorted by score. date seems irrelevant as these are active sessions.
+    def self.ams_index(current_user, options = {})
+      client_id = options[:client_id]
+      genre = options[:genre]
+      lang = options[:lang]
+      keyword = options[:keyword]
+      offset = options[:offset]
+      limit = options[:limit]
+
+      connection = Connection.where(user_id: current_user.id, client_id: client_id).first!
+      my_locidispid = connection.locidispid
+      my_audio_latency = connection.last_jam_audio_latency
+
+      query = ActiveMusicSession
+      .select('active_music_sessions.*, 1 as tag, 15 as latency')
+      .joins(
+        %Q{
+          INNER JOIN
+            music_sessions
+          ON
+            music_sessions.id = active_music_sessions.id
+        }
+      )
+
+      # TODO integrate ams_music_session_tmp into the processing
+      # query = query.joins(
+      #   %Q{
+      #     INNER JOIN
+      #       ams_music_session_tmp
+      #     ON
+      #       ams_music_session_tmp.music_session_id = active_music_sessions.id
+      #   }
+      # )
+
+      query = query.order(
+        %Q{
+          tag, latency
+        }
+      )
+
+      if (offset)
+        query = query.offset(offset)
+      end
+
+      if (limit)
+        query = query.limit(limit)
+      end
+
+      # cleanse keyword so it is only word characters. ignore if less than 3 characters long or too long
+      # TODO do we want to force match of whole words only? this just picks the first word out...
+
+      unless keyword.nil? or keyword.length < 3 or keyword.length > 100
+        w = keyword.split(/\W+/)
+        if w.length > 0 and w.length >= 3
+          query = query.where("music_sessions.description like '%#{w[0]}%'")
+        end
+      end
+
+      query = query.where("music_sessions.genre_id in (?)", genres) unless genres.nil?
+
+      # TODO filter by lang
+
+      return query
+    end
+
     def self.participant_create user, music_session_id, client_id, as_musician, tracks
       music_session = MusicSession.find(music_session_id)