MDL-84779 core_ai: Add method for getting model settings keys

.upgradenotes/MDL-84779-2025042903491664.yml

@@ -0,0 +1,8 @@
+issueNumber: MDL-84779
+notes:
+  core_ai:
+    - message: >-
+        The method `has_model_settings` inside `core_ai\aimodel\base`
+        is now determined by values returned from a new method called
+        `get_model_settings`.
+      type: changed

ai/classes/aimodel/base.php

@@ -56,6 +56,15 @@ abstract class base {
      * @return bool Whether the model has settings.
      */
     public function has_model_settings(): bool {
-        return false;
+        return !empty($this->get_model_settings());
+    }
+
+    /**
+     * Get all settings that can be configured for a model.
+     *
+     * @return string[] Array of settings.
+     */
+    public function get_model_settings(): array {
+        return [];
     }
 }

ai/classes/form/action_settings_form.php

@@ -72,4 +72,22 @@ class action_settings_form extends moodleform {
             return $data;
         }
     }
+
+    #[\Override]
+    public function get_data(): ?\stdClass {
+        $data = parent::get_data();
+
+        if ($data) {
+            if (isset($data->modeltemplate)) {
+                if ($data->modeltemplate === 'custom') {
+                    $data->model = $data->custommodel;
+                } else {
+                    // Set the model to the selected model template.
+                    $data->model = $data->modeltemplate;
+                }
+            }
+        }
+
+        return $data;
+    }
 }