user upgrades: send dmail to purchaser for gifted upgrades.

* Refactor to move upgrade logic from UserPromotion to UserUpgrade.
* Send the recipient and the purchaser of a gifted upgrade separate
  dmail notifications.

app/logical/user_promotion.rb

@@ -1,13 +1,12 @@
 class UserPromotion
-  attr_reader :user, :promoter, :new_level, :old_can_approve_posts, :old_can_upload_free, :can_upload_free, :can_approve_posts, :is_upgrade
+  attr_reader :user, :promoter, :new_level, :old_can_approve_posts, :old_can_upload_free, :can_upload_free, :can_approve_posts
 
-  def initialize(user, promoter, new_level, can_upload_free: nil, can_approve_posts: nil, is_upgrade: false)
+  def initialize(user, promoter, new_level, can_upload_free: nil, can_approve_posts: nil)
     @user = user
     @promoter = promoter
     @new_level = new_level.to_i
     @can_upload_free = can_upload_free
     @can_approve_posts = can_approve_posts
-    @is_upgrade = is_upgrade
   end
 
   def promote!
@@ -21,7 +20,7 @@ class UserPromotion
     user.can_approve_posts = can_approve_posts unless can_approve_posts.nil?
     user.inviter = promoter
 
-    create_user_feedback unless is_upgrade
+    create_user_feedback
     create_dmail
     create_mod_actions
 
@@ -40,8 +39,7 @@ class UserPromotion
     end
 
     if user.level_changed?
-      category = is_upgrade ? :user_account_upgrade : :user_level_change
-      ModAction.log(%{"#{user.name}":#{Routes.user_path(user)} level changed #{user.level_string_was} -> #{user.level_string}}, category, promoter)
+      ModAction.log(%{"#{user.name}":#{Routes.user_path(user)} level changed #{user.level_string_was} -> #{user.level_string}}, :user_level_change, promoter)
     end
   end
 
@@ -54,8 +52,6 @@ class UserPromotion
       raise User::PrivilegeError, "You can't promote other users to your rank or above"
     elsif user.level >= promoter.level
       raise User::PrivilegeError, "You can't promote or demote other users at your rank or above"
-    elsif is_upgrade && user.is_builder?
-      raise User::PrivilegeError, "You can't upgrade a user that is above Platinum level"
     end
   end
 

app/models/user_upgrade.rb

@@ -81,21 +81,50 @@ class UserUpgrade < ApplicationRecord
     recipient != purchaser
   end
 
-  def process_upgrade!(payment_status)
-    recipient.with_lock do
-      return if status == "complete"
+  concerning :UpgradeMethods do
+    def process_upgrade!(payment_status)
+      recipient.with_lock do
+        return if status == "complete"
 
-      if payment_status == "paid"
-        upgrade_recipient!
-        update!(status: :complete)
-      else
-        update!(status: :processing)
+        if payment_status == "paid"
+          upgrade_recipient!
+          create_mod_action!
+          dmail_recipient!
+          dmail_purchaser!
+          update!(status: :complete)
+        else
+          update!(status: :processing)
+        end
       end
     end
-  end
 
-  def upgrade_recipient!
-    recipient.promote_to!(level, User.system, is_upgrade: true)
+    def upgrade_recipient!
+      recipient.update!(level: level, inviter: User.system)
+    end
+
+    def create_mod_action!
+      ModAction.log(%{"#{recipient.name}":#{Routes.user_path(recipient)} level changed #{User.level_string(recipient.level_before_last_save)} -> #{recipient.level_string}}, :user_account_upgrade, purchaser)
+    end
+
+    def dmail_recipient!
+      if is_gift?
+        body = "Congratulations, your account has been upgraded to #{level_string} by <@#{purchaser.name}>. Enjoy!"
+      else
+        body = "You are now a #{level_string} user. Thanks for supporting #{Danbooru.config.canonical_app_name}!"
+      end
+
+      title = "You have been upgraded to #{level_string}!"
+      Dmail.create_automated(to: recipient, title: title, body: body)
+    end
+
+    def dmail_purchaser!
+      return unless is_gift?
+
+      title = "#{recipient.name} has been upgraded to #{level_string}!"
+      body = "<@#{recipient.name}> is now a #{level_string} user. Thanks for supporting #{Danbooru.config.canonical_app_name}!"
+
+      Dmail.create_automated(to: purchaser, title: title, body: body)
+    end
   end
 
   concerning :StripeMethods do

db/populate.rb

@@ -68,14 +68,14 @@ if User.count == 0
       :password => "password1",
       :password_confirmation => "password1"
     )
-    newuser.promote_to!(User::Levels::BUILDER, :can_upload_free => true, :is_upgrade => true, :skip_dmail => true)
+    newuser.promote_to!(User::Levels::BUILDER, :can_upload_free => true, :skip_dmail => true)
 
     newuser = User.create(
       :name => "approver",
       :password => "password1",
       :password_confirmation => "password1"
     )
-    newuser.promote_to!(User::Levels::BUILDER, :can_approve_posts => true, :is_upgrade => true, :skip_dmail => true)
+    newuser.promote_to!(User::Levels::BUILDER, :can_approve_posts => true, :skip_dmail => true)
   end
 
   0.upto(10) do |i|