FEATURE: Allow admin to auto reopen at topic.

* This commit also introduces a `TopicStatusUpdate`
  model to support other forms of deferred topic
  status update in the future.

app/controllers/topics_controller.rb

@@ -21,7 +21,7 @@ class TopicsController < ApplicationController
                                           :merge_topic,
                                           :clear_pin,
                                           :re_pin,
-                                          :autoclose,
+                                          :status_update,
                                           :bulk,
                                           :reset_new,
                                           :change_post_owners,
@@ -284,20 +284,33 @@ class TopicsController < ApplicationController
     toggle_mute
   end
 
-  def autoclose
-    params.permit(:auto_close_time, :timezone_offset)
-    params.require(:auto_close_based_on_last_post)
+  def status_update
+    params.permit(:time, :timezone_offset, :based_on_last_post)
+    params.require(:status_type)
 
-    topic = Topic.find_by(id: params[:topic_id].to_i)
+    status_type =
+      begin
+        TopicStatusUpdate.types.fetch(params[:status_type].to_sym)
+      rescue
+        invalid_param(:status_type)
+      end
+
+    topic = Topic.find_by(id: params[:topic_id])
     guardian.ensure_can_moderate!(topic)
 
-    topic.auto_close_based_on_last_post = params[:auto_close_based_on_last_post]
-    topic.set_auto_close(params[:auto_close_time], {by_user: current_user, timezone_offset: params[:timezone_offset] ? params[:timezone_offset].to_i : nil})
+    topic_status_update = topic.set_or_create_status_update(
+      status_type,
+      params[:time],
+      by_user: current_user,
+      timezone_offset: params[:timezone_offset]&.to_i,
+      based_on_last_post: params[:based_on_last_post]
+    )
 
     if topic.save
       render json: success_json.merge!({
-        auto_close_at: topic.auto_close_at,
-        auto_close_hours: topic.auto_close_hours
+        execute_at: topic_status_update&.execute_at,
+        duration: topic_status_update&.duration,
+        based_on_last_post: topic_status_update&.based_on_last_post
       })
     else
       render_json_error(topic)