Default to compatible pet types in new item page preview

Just adapted from Impress 2020 logic again, easy peasy!

app/controllers/items_controller.rb

@@ -214,10 +214,7 @@ class ItemsController < ApplicationController
   end
 
   def load_default_preview_pet_type
-    PetType.find_by_color_id_and_species_id(
+    @item.compatible_pet_type
-      Color.find_by_name("Blue"),
-      Species.find_by_name("Acara"),
-    )
   end
 
   def validate_preview

app/models/item.rb

@@ -489,6 +489,24 @@ class Item < ApplicationRecord
     }.merge(options))
   end
 
+  def compatible_body_ids
+    swf_assets.map(&:body_id).uniq
+  end
+
+  def compatible_pet_types
+    return PetType.all if compatible_body_ids.include?(0)
+    PetType.where(body_id: compatible_body_ids)
+  end
+
+  # Return a pet type that can wear this item, preferring simple colors and
+  # early-alphabetically species.
+  def compatible_pet_type
+    compatible_pet_types.joins(:color, :species).order(:species_id).
+      merge(Color.order(basic: :desc, standard: :desc, name: :asc)).
+      merge(Species.order(name: :asc)).
+      first
+  end
+
   def handle_assets!
     if @parent_swf_asset_relationships_to_update && @current_body_id
       new_swf_asset_ids = @parent_swf_asset_relationships_to_update.map(&:swf_asset_id)