102 lines
3.4 KiB
Ruby
102 lines
3.4 KiB
Ruby
class EmailLogic
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attr_reader :open_percentage, :last_email_sent_at, :days_until_next_email, :articles_to_send
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def initialize(user)
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@user = user
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@open_percentage = nil
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@ready_to_receive_email = nil
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@last_email_sent_at = nil
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@days_until_next_email = nil
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@articles_to_send = []
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end
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def analyze
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@last_email_sent_at = get_last_digest_email_user_received
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@open_percentage = get_open_rate
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@days_until_next_email = get_days_until_next_email
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@ready_to_receive_email = get_user_readiness
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@articles_to_send = get_articles_to_send if @ready_to_receive_email
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self
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end
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def should_receive_email?
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@ready_to_receive_email
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end
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private
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def get_articles_to_send
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fresh_date = get_fresh_date
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articles = if user_has_followings?
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experience_level_rating = (@user.experience_level || 5)
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experience_level_rating_min = experience_level_rating - 3.6
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experience_level_rating_max = experience_level_rating + 3.6
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@user.followed_articles
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.where("published_at > ?", fresh_date)
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.where(published: true, email_digest_eligible: true)
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.where.not(user_id: @user.id)
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.where("score > ?", 12)
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.where("experience_level_rating > ? AND experience_level_rating < ?",
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experience_level_rating_min, experience_level_rating_max)
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.order(score: :desc)
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.limit(8)
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else
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Article.published
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.where("published_at > ?", fresh_date)
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.where(featured: true, email_digest_eligible: true)
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.where.not(user_id: @user.id)
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.where("score > ?", 25)
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.order(score: :desc)
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.limit(8)
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end
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@ready_to_receive_email = false if articles.length < 3
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articles
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end
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def get_days_until_next_email
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# Relies on hyperbolic tangent function to model the frequency of the digest email
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max_day = SiteConfig.periodic_email_digest_max
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min_day = SiteConfig.periodic_email_digest_min
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result = max_day * (1 - Math.tanh(2 * @open_percentage))
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result = result.round
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result < min_day ? min_day : result
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end
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def get_open_rate
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past_sent_emails = @user.email_messages.where(mailer: "DigestMailer#digest_email").limit(10)
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past_sent_emails_count = past_sent_emails.count
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# Will stick with 50% open rate if @user has no/not-enough email digest history
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return 0.5 if past_sent_emails_count < 10
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past_opened_emails_count = past_sent_emails.where("opened_at IS NOT NULL").count
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past_opened_emails_count / past_sent_emails_count
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end
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def get_user_readiness
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return true unless @last_email_sent_at
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# Has it been at least x days since @user received an email?
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Time.current - @last_email_sent_at >= @days_until_next_email.days.to_i
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end
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def get_last_digest_email_user_received
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@user.email_messages.where(mailer: "DigestMailer#digest_email").last&.sent_at
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end
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def get_fresh_date
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a_few_days_ago = 4.days.ago.utc
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return a_few_days_ago unless @last_email_sent_at
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a_few_days_ago > @last_email_sent_at ? a_few_days_ago : @last_email_sent_at
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end
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def user_has_followings?
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@user.cached_following_users_ids.any? || @user.cached_followed_tag_names.any?
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end
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end
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