feat: Add support for realtime-events in copilot-threads and copilot-messages (#11557)

- Add API support for creating a thread
- Add API support for creating a message
- Remove uuid from thread (no longer required, we will use existing
websocket connection to send messages)
- Update message_type to a column (user, assistant, assistant_thinking)

enterprise/app/models/copilot_message.rb

@@ -4,24 +4,47 @@
 #
 #  id                :bigint           not null, primary key
 #  message           :jsonb            not null
-#  message_type      :string           not null
+#  message_type      :integer          default("user")
 #  created_at        :datetime         not null
 #  updated_at        :datetime         not null
 #  account_id        :bigint           not null
 #  copilot_thread_id :bigint           not null
-#  user_id           :bigint           not null
 #
 # Indexes
 #
 #  index_copilot_messages_on_account_id         (account_id)
 #  index_copilot_messages_on_copilot_thread_id  (copilot_thread_id)
-#  index_copilot_messages_on_user_id            (user_id)
 #
 class CopilotMessage < ApplicationRecord
   belongs_to :copilot_thread
-  belongs_to :user
   belongs_to :account
 
-  validates :message_type, presence: true, inclusion: { in: %w[user assistant assistant_thinking] }
+  before_validation :ensure_account
+
+  enum message_type: { user: 0, assistant: 1, assistant_thinking: 2 }
+
+  validates :message_type, presence: true, inclusion: { in: message_types.keys }
   validates :message, presence: true
+
+  after_create_commit :broadcast_message
+
+  def push_event_data
+    {
+      id: id,
+      message: message,
+      message_type: message_type,
+      created_at: created_at.to_i,
+      copilot_thread: copilot_thread.push_event_data
+    }
+  end
+
+  private
+
+  def ensure_account
+    self.account = copilot_thread.account
+  end
+
+  def broadcast_message
+    Rails.configuration.dispatcher.dispatch(COPILOT_MESSAGE_CREATED, Time.zone.now, copilot_message: self)
+  end
 end