Subscription tests and domain (#2209)

* Save work

* Subscriptions and trials domain

* Store family ID on customer

* Remove indirection of stripe calls

* Test simplifications

* Update brakeman

* Fix stripe tests in CI

* Update billing page to show subscription details

* Remove legacy columns

* Complete billing settings page

* Fix hardcoded plan name

* Handle subscriptions for self hosting mode

* Lint fixes

app/models/family/subscribeable.rb

@@ -0,0 +1,81 @@
+module Family::Subscribeable
+  extend ActiveSupport::Concern
+
+  included do
+    has_one :subscription, dependent: :destroy
+  end
+
+  def billing_email
+    primary_admin = users.admin.order(:created_at).first
+
+    unless primary_admin.present?
+      raise "No primary admin found for family #{id}.  This is an invalid data state and should never occur."
+    end
+
+    primary_admin.email
+  end
+
+  def upgrade_required?
+    return false if self_hoster?
+    return false if subscription&.active? || subscription&.trialing?
+
+    true
+  end
+
+  def can_start_trial?
+    subscription&.trial_ends_at.blank?
+  end
+
+  def start_trial_subscription!
+    create_subscription!(
+      status: "trialing",
+      trial_ends_at: Subscription.new_trial_ends_at
+    )
+  end
+
+  def trialing?
+    subscription&.trialing? && days_left_in_trial.positive?
+  end
+
+  def has_active_subscription?
+    subscription&.active?
+  end
+
+  def needs_subscription?
+    subscription.nil? && !self_hoster?
+  end
+
+  def next_billing_date
+    subscription&.current_period_ends_at
+  end
+
+  def start_subscription!(stripe_subscription_id)
+    if subscription.present?
+      subscription.update!(status: "active", stripe_id: stripe_subscription_id)
+    else
+      create_subscription!(status: "active", stripe_id: stripe_subscription_id)
+    end
+  end
+
+  def days_left_in_trial
+    return -1 unless subscription.present?
+    ((subscription.trial_ends_at - Time.current).to_i / 86400) + 1
+  end
+
+  def percentage_of_trial_remaining
+    return 0 unless subscription.present?
+    (days_left_in_trial.to_f / Subscription::TRIAL_DAYS) * 100
+  end
+
+  def percentage_of_trial_completed
+    return 0 unless subscription.present?
+    (1 - days_left_in_trial.to_f / Subscription::TRIAL_DAYS) * 100
+  end
+
+  private
+    def sync_trial_status!
+      if subscription&.status == "trialing" && days_left_in_trial < 0
+        subscription.update!(status: "paused")
+      end
+    end
+end