module JamRuby
  class UserSync < ActiveRecord::Base

    belongs_to :recorded_track
    belongs_to :mix
    belongs_to :quick_mix

    def self.show(id, user_id)
      self.index({user_id: user_id, id: id, limit: 1, offset: 0})[:query].first
    end

    def self.index(params)
      user_id = params[:user_id]
      limit = params[:limit].to_i
      limit = limit == 0 ? 20 : limit
      offset = params[:offset].to_i
      id = params[:id]
      recording_id = params[:recording_id]

      page = (offset / limit) + 1 # one-based madness

      raise 'no user id specified' if user_id.blank?

      query = UserSync.includes(recorded_track: [{recording: [:owner, {claimed_recordings: [:share_token]}, {recorded_tracks: [:user]}, {comments:[:user]}, :likes, :plays, :mixes]}, user: [], instrument:[]], mix: [], quick_mix:[]).where(user_id: user_id).paginate(:page => page, :per_page => limit).order('created_at DESC, unified_id')


      # allow selection of single user_sync, by ID
      unless id.blank?
        query = query.where(unified_id: id)
      end

      unless recording_id.blank?
        query = query.where(recording_id: recording_id)
      end

      if query.length == 0
        { query:query, next: nil}
      elsif query.length < limit
        { query:query, next: nil}
      else
        { query:query, next: offset + limit}
      end
    end
  end
end