feat: add global config for captain settings (#13141)

Co-authored-by: aakashb95 <aakashbakhle@gmail.com>
Co-authored-by: Aakash Bakhle <48802744+aakashb95@users.noreply.github.com>

app/models/concerns/captain_featurable.rb

@@ -0,0 +1,62 @@
+# frozen_string_literal: true
+
+module CaptainFeaturable
+  extend ActiveSupport::Concern
+
+  included do
+    validate :validate_captain_models
+
+    # Dynamically define accessor methods for each captain feature
+    Llm::Models.feature_keys.each do |feature_key|
+      # Define enabled? methods (e.g., captain_editor_enabled?)
+      define_method("captain_#{feature_key}_enabled?") do
+        captain_features_with_defaults[feature_key]
+      end
+
+      # Define model accessor methods (e.g., captain_editor_model)
+      define_method("captain_#{feature_key}_model") do
+        captain_models_with_defaults[feature_key]
+      end
+    end
+  end
+
+  def captain_preferences
+    {
+      models: captain_models_with_defaults,
+      features: captain_features_with_defaults
+    }.with_indifferent_access
+  end
+
+  private
+
+  def captain_models_with_defaults
+    stored_models = captain_models || {}
+    Llm::Models.feature_keys.each_with_object({}) do |feature_key, result|
+      stored_value = stored_models[feature_key]
+      result[feature_key] = if stored_value.present? && Llm::Models.valid_model_for?(feature_key, stored_value)
+                              stored_value
+                            else
+                              Llm::Models.default_model_for(feature_key)
+                            end
+    end
+  end
+
+  def captain_features_with_defaults
+    stored_features = captain_features || {}
+    Llm::Models.feature_keys.index_with do |feature_key|
+      stored_features[feature_key] == true
+    end
+  end
+
+  def validate_captain_models
+    return if captain_models.blank?
+
+    captain_models.each do |feature_key, model_name|
+      next if model_name.blank?
+      next if Llm::Models.valid_model_for?(feature_key, model_name)
+
+      allowed_models = Llm::Models.models_for(feature_key)
+      errors.add(:captain_models, "'#{model_name}' is not a valid model for #{feature_key}. Allowed: #{allowed_models.join(', ')}")
+    end
+  end
+end