module JamRuby
  # not a active_record model; just a search result
  class Search
    attr_accessor :bands, :musicians, :fans, :recordings, :friends

    PARAM_MUSICIAN = :search_m

    LIMIT = 10
    M_PER_PAGE = 20

    M_ORDER_FOLLOWS = ['Most Followed', :followed]
    M_ORDER_PLAYS = ['Most Plays', :plays]
    M_ORDER_PLAYING = ['Playing Now', :playing]
    M_ORDERINGS = [M_ORDER_FOLLOWS, M_ORDER_PLAYS, M_ORDER_PLAYING]
    M_ORDERING_KEYS = M_ORDERINGS.collect { |oo| oo[1] }

    def self.musician_order_param(params)
      ordering = params[:orderby]
      ordering.blank? ? M_ORDERING_KEYS[0] : M_ORDERING_KEYS.detect { |oo| oo.to_s == ordering }
    end

    def self.musician_search(params={}, current_user=nil)
      rel = User.where(:musician => true)
      unless (instrument = params[:instrument]).blank?
        rel = rel.joins("RIGHT JOIN musicians_instruments AS minst ON minst.user_id = users.id")
          .where(['minst.instrument_id = ? AND users.id IS NOT NULL', instrument])
      end

      location_distance, location_city = params[:distance], params[:city]
      if location_distance && location_city
        if geo = MaxMindGeo.where(:city => params[:city]).limit(1).first
          citylatlng = [geo.lat, geo.lng]
          rel = rel.within(location_distance, :origin => citylatlng)
        end
      elsif current_user 
        latlng = []
        if current_user.lat.nil?
          if params[:remote_ip]
            if geo = MaxMindGeo.ip_lookup(params[:remote_ip])
              latlng = [geo.lat, geo.lng]
            end
          end
        else
          latlng = [current_user.lat, current_user.lng]
        end
        distance = location_distance || 50
        rel = rel.within(distance, :origin => latlng) unless latlng.blank?
      end

      sel_str = 'users.*'
      case ordering = self.musician_order_param(params)
      when :plays
      when :followed
        sel_str = "COUNT(follows) AS search_follow_count, #{sel_str}"
        rel = rel.joins("LEFT JOIN users_followers AS follows ON follows.user_id = users.id")
        rel = rel.group("users.id")
        rel = rel.order("COUNT(follows) DESC, users.created_at DESC")
      when :playing
      end

      rel = rel.joins("LEFT JOIN friendships AS friends ON friends.user_id = users.id")
      sel_str = "#{sel_str}, COUNT(friends) AS search_friend_count"
      rel = rel.joins("LEFT JOIN recordings AS records ON records.owner_id = users.id")
      sel_str = "#{sel_str}, COUNT(records) AS search_recording_count"
      rel = rel.joins("LEFT JOIN music_sessions AS sessions ON sessions.user_id = users.id")
      sel_str = "#{sel_str}, COUNT(sessions) AS search_session_count"
      rel = rel.select(sel_str)

      perpage = params[:per_page] || M_PER_PAGE
      page = [params[:page].to_i, 1].max
      rel = rel.paginate(:page => page, :per_page => perpage)
      rel.includes([:instruments, :followings])

      Search.new(rel.all)
    end

    # performs a site-white search
    def self.search(query, user_id = nil)

      users = User.search(query, :limit => LIMIT)
      bands = Band.search(query, :limit => LIMIT)
      # NOTE: I removed recordings from search here. This is because we switched
      # to "claimed_recordings" so it's not clear what should be searched.

      friends = Friendship.search(query, user_id, :limit => LIMIT)

      return Search.new(users + bands + friends)
    end

    # performs a friend search scoped to a specific user
    # def self.search_by_user(query, user_id)
    #   friends = Friendship.search(query, user_id, :limit => LIMIT)
    #   return Search.new(friends)
    # end

    # search_results - results from a Tire search across band/user/recording
    def initialize(search_results)
      @bands = []
      @musicians = []
      @fans = []
      @recordings = []
      @friends = []

      if search_results.nil?
        return
      end

      search_results.take(LIMIT).each do |result| 
        if result.class == User
          if result.musician
            @musicians.push(result)
          else
            @fans.push(result)
          end
        elsif result.class == Band
          @bands.push(result)
        elsif result.class == Recording
          @recordings.push(result)
        elsif result.class == Friendship
          @friends.push(result.friend)
        else
          raise Exception, "unknown class #{result.class} returned in search results"
        end     
      end
    end
    
    def self.create_tsquery(query)
      # empty queries don't hit back to elasticsearch
      if query.nil? || query.length == 0
        return nil
      end

      search_terms = query.split

      if search_terms.length == 0
        return nil
      end

      args = nil
      search_terms.each do |search_term|
        if args == nil  
          args = search_term
        else
          args = args + " & " + search_term
        end
        
      end
      args = args + ":*"

      return args
    end

  end
end