# -*- coding: utf-8 -*-
module JamRuby
  class EmailBatchProgression < EmailBatchPeriodic

    BATCH_SIZE = 3
    SINCE_WEEKS = 2

    SUBTYPES = [:client_notdl,  # Registered Musician Has Not Downloaded Client
                :client_dl_notrun,  # Registered Musician Has Downloaded Client But Not Yet Run It
                :client_run_notgear,  # Registered Musician Has Run Client But Not Successfully Qualified Audio Gear
                :gear_notsess,  # Registered Musician Has Successfully Qualified Audio Gear But Has Not Participated in a ‘Real’ Session
                :sess_notgood,  # Registered Musician Has Participated In a "Real" Session But Has Not Had a "Good" Session
                :reg_notinvite, # Registered Musician Has Not Invited Friends to Join JamKazam
                :reg_notconnect,  # Registered Musician Has Not Connected with any Friends on JamKazam
                :reg_notlike,  # Registered Musician Has Not Liked Jamkazam
                :sess_notrecord  # Registered Musician Has Participated In a "Real" Session But Has Not Made a Recording
               ]

    SUBTYPE_METADATA = {
      :client_notdl => {
        :subject => "Get the free JamKazam app now and start playing with others!", 
        :title => "Download the Free JamKazam App"
      },
      :client_dl_notrun => {
        :subject => "Having trouble running the JamKazam application?", 
        :title => "Running the JamKazam App"
      },
      :client_run_notgear => {
        :subject => "Having trouble setting up your audio gear for JamKazam?", 
        :title => "Setting Up and Qualifying Your Audio Gear on JamKazam"
      },
      :gear_notsess => {
        :subject => "Having trouble getting into a session with other musicians?", 
        :title => "Tips on Getting into Sessions with Other Musicians"
      },
      :sess_notgood => {
        :subject => "Have you played in a “good” session on JamKazam yet?", 
        :title => "Having a Good Session on JamKazam"
      },
      :reg_notinvite => {
        :subject => "Invite your friends to JamKazam, best way to play online!", 
        :title => "Invite Your Friends to Come and Play with You"
      },
      :reg_notconnect => {
        :subject => "Make friends on JamKazam and play more music!", 
        :title => "Connecting with Friends on JamKazam"
      },
      :reg_notlike => {
        :subject => "Please give us a LIKE!", 
        :title => "Like/Follow JamKazam"
      },
      :sess_notrecord => {
        :subject => "Want to make recordings during your JamKazam sessions?", 
        :title => "Making & Sharing Recordings on JamKazam"
      },
    }

    def self.subject(subtype=nil)
      SUBTYPE_METADATA[subtype][:subject] if subtype
    end

    def self.title(subtype=nil)
      SUBTYPE_METADATA[subtype][:title] if subtype
    end

    def self.subtype_trigger_interval(subtype)
      [:reg_notlike, :sess_notrecord].include?(subtype) ? [7,14,21] : [2,5,14]
    end

    def self.days_past_for_trigger_index(subtype, idx)
      self.subtype_trigger_interval(subtype)[idx]
    end

    def days_past_for_trigger_index(idx)
      self.class.subtype_trigger_interval(self.sub_type)[idx]
    end

    def fetch_recipients(since=nil)
      since ||= Time.now - SINCE_WEEKS.weeks
      User.geocoded_users
        .email_opt_in
        .where(['created_at < ?', since])
        .find_in_batches(batch_size: self::BATCH_SIZE) do |users|
        new_musicians = users.inject({}) do |hh, uu|
          if 0 < (nearby = uu.nearest_musicians).count
            hh[uu] = nearby
          end
          hh
        end
        yield(new_musicians) if block_given?
      end
    end

    def trigger_date_constraint(trigger_idx, date_column)
      intervals = self.class.subtype_trigger_interval(self.sub_type)
      case trigger_idx
      when 1
          return ["#{date_column} >= ? AND #{date_column} < ?", 
                  Time.now - intervals[0].days,
                  Time.now - intervals[1].days]
      else
          return ["#{date_column} < ?", Time.now - intervals[trigger_idx].days]
      end      
    end

    def fetch_client_notdl(trigger_idx=0)
      fetched = []
      rel = User
        .joins("LEFT JOIN email_batch_sets AS ebs ON ebs.user_id = users.id AND ebs.sub_type = '#{self.sub_type}'")
        .email_opt_in
        .musicians
        .where("ebs.id IS NULL OR (SELECT MAX(trigger_index) FROM email_batch_sets ebs WHERE ebs.sub_type = '#{self.sub_type}' AND ebs.user_id = users.id ) < #{trigger_idx}")
        .where("first_downloaded_client_at IS NULL")
        .where(self.trigger_date_constraint(trigger_idx, "users.created_at"))
        .find_in_batches(batch_size: 100) do |users|
        block_given? ? yield(users) : fetched.concat(users)
      end
      fetched
    end

    def deliver_batch_sets!
      self.opt_in_count = 0
      sent = 0
      3.times do |trigger_idx| 
        self.send("fetch_#{self.sub_type}", trigger_idx) do |users|
          users.each do |uu|
            self.email_batch_sets << (bset = EmailBatchSet.progress_set(self, uu, trigger_idx))
            ProgressMailer.send_reminder(bset).deliver
            sent += 1
          end
        end
      end
      self.sent_count = sent
      self.save
      self.did_batch_run!
    end

  end
end