module JamRuby
  # not a active_record model; just a search result
  class Search
    attr_accessor :bands, :musicians, :fans, :recordings, :friends, :search_type
    LIMIT = 10

    # 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=nil)
      @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)
            @search_type = PARAM_MUSICIAN
          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

    attr_accessor :user_counters, :page_num, :page_count

    PARAM_MUSICIAN = :srch_m
    PARAM_BAND = :srch_b

    B_PER_PAGE = M_PER_PAGE = 10
    M_MILES_DEFAULT = 500
    B_MILES_DEFAULT = 0

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

    DISTANCE_OPTS = B_DISTANCE_OPTS = M_DISTANCE_OPTS = [['Any', 0], [1000.to_s, 1000], [500.to_s, 500], [250.to_s, 250], [100.to_s, 100], [50.to_s, 50], [25.to_s, 25]]

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

    def self.musician_search(params={}, current_user=nil)
      rel = User.musicians
      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

      rel = MaxMindGeo.where_latlng(rel, params, current_user)

      sel_str = 'users.*'
      case ordering = self.order_param(params)
      when :plays  # FIXME:  double counting?
        sel_str = "COUNT(records)+COUNT(sessions) AS play_count, #{sel_str}"
        rel = rel.joins("LEFT JOIN music_sessions AS sessions ON sessions.user_id = users.id")
          .joins("LEFT JOIN recordings AS records ON records.owner_id = users.id")
          .group("users.id")
          .order("play_count DESC, users.created_at DESC")
      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")
          .group("users.id")
          .order("COUNT(follows) DESC, users.created_at DESC")
      when :playing
        rel = rel.joins("LEFT JOIN connections ON connections.user_id = users.id")
          .where(['connections.music_session_id IS NOT NULL AND connections.aasm_state != ?',
                  'expired'])
          .order("users.created_at DESC")
      end

      rel = rel.select(sel_str)
      perpage = [(params[:per_page] || M_PER_PAGE).to_i, 100].min
      page = [params[:page].to_i, 1].max
      rel = rel.paginate(:page => page, :per_page => perpage)
      rel = rel.includes([:instruments, :followings, :friends])

      objs = rel.all
      srch = Search.new
      srch.page_num, srch.page_count = page, objs.total_pages
      srch.musician_results_for_user(objs, current_user)
    end

    RESULT_FOLLOW = :follows
    RESULT_FRIEND = :friends

    COUNT_FRIEND = :count_friend
    COUNT_FOLLOW = :count_follow
    COUNT_RECORD = :count_record
    COUNT_SESSION = :count_session
    COUNTERS = [COUNT_FRIEND, COUNT_FOLLOW, COUNT_RECORD, COUNT_SESSION]

    def musician_results_for_user(results, user)
      @search_type, @musicians = PARAM_MUSICIAN, results
      if user
        @user_counters = results.inject({}) { |hh,val| hh[val.id] = []; hh }
        mids = "'#{@musicians.map(&:id).join("','")}'"

        # this gets counts for each search result on friends/follows/records/sessions
        results.each do |uu|
          counters = { }
          counters[COUNT_FRIEND] = Friendship.where(:user_id => uu.id).count
          counters[COUNT_FOLLOW] = UserFollowing.where(:user_id => uu.id).count
          counters[COUNT_RECORD] = ClaimedRecording.where(:user_id => uu.id).count
          counters[COUNT_SESSION] = MusicSession.where(:user_id => uu.id).count
          @user_counters[uu.id] << counters
        end

        # this section determines follow/like/friend status for each search result
        # so that action links can be activated or not
        rel = User.select("users.id AS uid")
        rel = rel.joins("LEFT JOIN users_followers AS follows ON follows.follower_id = '#{user.id}'")
        rel = rel.where(["users.id IN (#{mids}) AND follows.user_id = users.id"])
        rel.all.each { |val| @user_counters[val.uid] << RESULT_FOLLOW }

        rel = User.select("users.id AS uid")
        rel = rel.joins("LEFT JOIN friendships AS friends ON friends.friend_id = '#{user.id}'")
        rel = rel.where(["users.id IN (#{mids}) AND friends.user_id = users.id"])
        rel.all.each { |val| @user_counters[val.uid] << RESULT_FRIEND }

      else
        @user_counters = {}
      end
      self
    end

    private 

    def _count(musician, key)
      if mm = @user_counters[musician.id] 
        return mm.detect { |ii| ii.is_a?(Hash) }[key]
      end if @user_counters
      0
    end

    public

    def follow_count(musician)
      _count(musician, COUNT_FOLLOW)
    end

    def friend_count(musician)
      _count(musician, COUNT_FRIEND)
    end

    def record_count(musician)
      _count(musician, COUNT_RECORD)
    end

    def session_count(musician)
      _count(musician, COUNT_SESSION)
    end

    def is_friend?(musician)
      if mm = @user_counters[musician.id] 
        return mm.include?(RESULT_FRIEND)
      end if @user_counters
      false
    end
    def is_follower?(musician)
      if mm = @user_counters[musician.id] 
        return mm.include?(RESULT_FOLLOW)
      end if @user_counters
      false
    end

    def self.new_musicians(usr, since_date=Time.now - 1.week, max_count=50, radius=M_MILES_DEFAULT)
      rel = User.musicians
        .where(['created_at >= ? AND users.id != ?', since_date, usr.id])
        .within(radius, :origin => [usr.lat, usr.lng])
        .order('created_at DESC')
        .limit(max_count)
      objs = rel.all.to_a
      if block_given?
        yield(objs) if 0 < objs.count
      else
        return objs
      end
    end

    def self.band_search(params={}, current_user=nil)
      rel = Band.scoped
      # rel = Arel::Table.new(:bands)

      unless (genre = params[:genre]).blank?
        rel = Band.joins("RIGHT JOIN band_genres AS bgenres ON bgenres.band_id = bands.id")
          .where(['bgenres.genre_id = ? AND bands.id IS NOT NULL', genre])
      end

      rel = MaxMindGeo.where_latlng(rel, params, current_user)

      sel_str = 'bands.*'
      case ordering = self.order_param(params)
      when :plays  # FIXME:  double counting?
        sel_str = "COUNT(records)+COUNT(sessions) AS play_count, #{sel_str}"
        rel = rel.joins("LEFT JOIN music_sessions AS sessions ON sessions.user_id = users.id")
          .joins("LEFT JOIN recordings AS records ON records.owner_id = users.id")
          .group("users.id")
          .order("play_count DESC, users.created_at DESC")
      when :followed
        sel_str = "COUNT(follows) AS search_follow_count, #{sel_str}"
        rel = rel.joins("LEFT JOIN bands_followers AS follows ON follows.band_id = bands.id")
          .group("bands.id")
          .order("COUNT(follows) DESC, bands.created_at DESC")
      when :playing
        rel = rel.joins("LEFT JOIN connections ON connections.user_id = users.id")
          .where(['connections.music_session_id IS NOT NULL AND connections.aasm_state != ?',
                  'expired'])
          .order("users.created_at DESC")
      end

      rel = rel.select(sel_str)
      perpage = [(params[:per_page] || M_PER_PAGE).to_i, 100].min
      page = [params[:page].to_i, 1].max
      rel = rel.paginate(:page => page, :per_page => perpage)
      rel = rel.includes([:users])

      objs = rel.all
      srch = Search.new
      srch.page_num, srch.page_count = page, objs.total_pages
      srch.band_results_for_user(objs, current_user)
    end

    def band_results_for_user(results, user)
      @search_type, @bands = PARAM_BAND, results
      if user
        @user_counters = results.inject({}) { |hh,val| hh[val.id] = []; hh }
        mids = "'#{@bands.map(&:id).join("','")}'"

        # this gets counts for each search result 
        results.each do |bb|
          counters = { }
          counters[COUNT_FOLLOW] = BandFollowing.where(:band_id => bb.id).count
          # counters[COUNT_RECORD] = ClaimedRecording.where(:band_id => bb.id).count
          # counters[COUNT_SESSION] = MusicSession.where(:band_id => bb.id).count
          @user_counters[bb.id] << counters
        end

        # this section determines follow/like/friend status for each search result
        # so that action links can be activated or not

        rel = Band.select("bands.id AS bid")
        rel = rel.joins("LEFT JOIN bands_followers AS follows ON follows.follower_id = '#{user.id}'")
        rel = rel.where(["bands.id IN (#{mids}) AND follows.band_id = bands.id"])
        rel.all.each { |val| @user_counters[val.bid] << RESULT_FOLLOW }

      else
        @user_counters = {}
      end
      self
    end

  end
end