# lib/questions_crafter/controller_helpers.rb
module QuestionsCrafter
  module ControllerHelpers
    def self.included(base)
      base.class_eval do
        extend ClassMethods
        include InstanceMethods
      end
    end

    module ClassMethods
      # Class methods for controllers using QuestionsCrafter
      def handles_questions(questions_class, on_success:)
        underscore_questions_class_name = questions_class.name.underscore
        define_method :questions_action_name do
          underscore_questions_class_name
        end

        define_method :questions_class do
          questions_class
        end

        define_method :questions_params do
          question_definitions = questions_class.questions
          permitted_params = question_definitions.map do |q|
            if q[:type] == :checkbox_group
              # For checkbox groups, permit an array of values
              { q[:name] => [] }
            else
              q[:name]
            end
          end

          params.require(underscore_questions_class_name).permit(permitted_params)
        end

        # This is the action that gets injected into the controller with the name of the provided class
        # but with underscore for example SignUpQuestions -> sign_up_questions
        # It is meant to handle both the GET and the POST verbs
        define_method underscore_questions_class_name do
          if request.post?
            send("#{underscore_questions_class_name}_post")
          elsif request.get?
            send("#{underscore_questions_class_name}_get")
          end
        end

        # The POST action is used to handle the form submission and redisplay if there are still validation errors
        define_method "#{underscore_questions_class_name}_post" do
          questions_object = questions_class.new(questions_params)
          success = false
          method_res = if questions_object.valid?
            success = true
            send(on_success, questions_object)
          end
          # method_res has a 302 if a redirect happened in the on_success method
          # TODO: should we halt the chain and handle the redirect after showing the confirmation with the read only form?
          # Maybe we should be able to render the form with a confirmation message and a countdown to redirect
          # TODO: What should we do here if all goes well? Display the form again with the values already filled but NON editable

          render QuestionsCrafter::Ui::Components::QuestionsPage.new(
            questions_object: questions_object,
            form_url: "#",
            form_method: :post,
            read_only: success
          ) unless method_res == 302
        end

        # The GET action is used to display the form
        define_method "#{underscore_questions_class_name}_get" do
          questions_object = questions_class.new
          render QuestionsCrafter::Ui::Components::QuestionsPage.new(
            questions_object: questions_object,
            form_url: "#",
            form_method: :post,
            read_only: false
          )
        end
      end
    end

    module InstanceMethods
      # Instance methods for controllers using QuestionsCrafter
    end
  end
end