chore: Move agent availability to Account level (#3074)

- Move agent availability to the account level

app/models/account_user.rb

@@ -2,14 +2,16 @@
 #
 # Table name: account_users
 #
-#  id         :bigint           not null, primary key
-#  active_at  :datetime
-#  role       :integer          default("agent")
-#  created_at :datetime         not null
-#  updated_at :datetime         not null
-#  account_id :bigint
-#  inviter_id :bigint
-#  user_id    :bigint
+#  id           :bigint           not null, primary key
+#  active_at    :datetime
+#  auto_offline :boolean          default(TRUE), not null
+#  availability :integer          default("online"), not null
+#  role         :integer          default("agent")
+#  created_at   :datetime         not null
+#  updated_at   :datetime         not null
+#  account_id   :bigint
+#  inviter_id   :bigint
+#  user_id      :bigint
 #
 # Indexes
 #
@@ -24,15 +26,20 @@
 #
 
 class AccountUser < ApplicationRecord
+  include AvailabilityStatusable
+
   belongs_to :account
   belongs_to :user
   belongs_to :inviter, class_name: 'User', optional: true
 
   enum role: { agent: 0, administrator: 1 }
+  enum availability: { online: 0, offline: 1, busy: 2 }
+
   accepts_nested_attributes_for :account
 
   after_create_commit :notify_creation, :create_notification_setting
   after_destroy :notify_deletion, :remove_user_from_account
+  after_save :update_presence_in_redis, if: :saved_change_to_availability?
 
   validates :user_id, uniqueness: { scope: :account_id }
 
@@ -56,4 +63,8 @@ class AccountUser < ApplicationRecord
   def notify_deletion
     Rails.configuration.dispatcher.dispatch(AGENT_REMOVED, Time.zone.now, account: account)
   end
+
+  def update_presence_in_redis
+    OnlineStatusTracker.set_status(account.id, user.id, availability)
+  end
 end