catstodon/app/lib/account_reach_finder.rb

# frozen_string_literal: true

class AccountReachFinder
  RECENT_LIMIT = 2_000
  STATUS_LIMIT = 200
  STATUS_SINCE = 2.days

  def initialize(account)
    @account = account
  end

  def inboxes
    (followers_inboxes + reporters_inboxes + recently_mentioned_inboxes + relay_inboxes).uniq
  end

  private

  def followers_inboxes
    @account.followers.inboxes
  end

  def reporters_inboxes
    Account.where(id: @account.targeted_reports.select(:account_id)).inboxes
  end

  def recently_mentioned_inboxes
    Account
      .joins(:mentions)
      .where(mentions: { status: recent_statuses })
      .inboxes
      .take(RECENT_LIMIT)
  end

  def relay_inboxes
    Relay.enabled.pluck(:inbox_url)
  end

  def oldest_status_id
    Mastodon::Snowflake
      .id_at(STATUS_SINCE.ago, with_random: false)
  end

  def recent_statuses
    @account
      .statuses
      .recent
      .where(id: oldest_status_id...)
      .limit(STATUS_LIMIT)
  end
end