NotificationService for resolving email notification logic

app/services/notification_service.rb

@@ -0,0 +1,51 @@
+# NotificationService class
+#
+# Used for notifing users with emails about different events
+#
+# Ex.
+#   NotificationService.new.new_issue(issue, current_user)
+#
+class NotificationService
+  # Always notify user about ssh key added
+  # only if ssh key is not deploy key
+  def new_key(key)
+    if key.user
+      Notify.delay.new_ssh_key_email(key.id)
+    end
+  end
+
+  # TODO: When we close an issue we should send next emails:
+  #
+  #  * issue author if his notification level is not Disabled
+  #  * issue assignee if his notification level is not Disabled
+  #  * project team members with notification level higher then Participating
+  #
+  def close_issue(issue, current_user)
+    [issue.author, issue.assignee].compact.uniq.each do |recipient|
+      Notify.delay.issue_status_changed_email(recipient.id, issue.id, issue.state, current_user.id)
+    end
+  end
+
+  # When we reassign an issue we should send next emails:
+  #
+  #  * issue author if his notification level is not Disabled
+  #  * issue assignee if his notification level is not Disabled
+  #
+  def reassigned_issue(issue, current_user)
+    recipient_ids = [issue.assignee_id, issue.assignee_id_was].keep_if {|id| id && id != current_user.id }
+
+    recipient_ids.each do |recipient_id|
+      Notify.delay.reassigned_issue_email(recipient_id, issue.id, issue.assignee_id_was)
+    end
+  end
+
+  # When we reassign an issue we should send next emails:
+  #
+  #  * issue assignee if his notification level is not Disabled
+  #
+  def new_issue(issue, current_user)
+    if issue.assignee && issue.assignee != current_user
+      Notify.delay.new_issue_email(issue.id)
+    end
+  end
+end