require "lasha/engine"

module Lasha
  INDEX_ACTIONS = %i[new show edit destroy]

  class << self
    def index_data(
      controller:,
      namespace: nil,
      model:     nil,
      actions:   nil,
      collection:,
      attributes:
    )
      index_data_hash = {
        namespace: set_or_guess_namespace(namespace, controller),
        model: set_or_guess_model(model, collection),
        collection: collection,
        attributes: attributes,
        actions: set_or_guess_actions(actions, controller)
      }
      validate_index_data(**index_data_hash)

      index_data_hash
    rescue ArgumentError => e
      puts "******** index_data argument error report"
      puts "Class:   #{e.class}"
      puts "Message: #{e.message}"
      puts e.backtrace
    end

    private

      def set_or_guess_namespace(namespace, controller)
        if namespace.present?
          namespace
        elsif controller.class.name.include?("::")
          controller.class.name.deconstantize.underscore.to_sym
        end
      end

      def set_or_guess_model(model, collection)
        if model.present?
          model
        elsif collection.present?
          collection.first.class
        end
      end

      def set_or_guess_actions(actions, controller)
        if actions.present?
          actions
        else
          controller.action_methods.to_a.map(&:to_sym) & INDEX_ACTIONS
        end
      end

      def validate_index_data(**index_data_hash)
        index_data_hash.each do |key, value|
          case key
          when :collection
            next if value.present?

            raise_args_error("Collection cannot be blank")
          # when :attributes
          when :model
            next if value.present?

            raise_args_error("Model cannot be deduced")
          when :actions
            next if (value - INDEX_ACTIONS).blank?

            raise_args_error("Uknown index action supplied")
          # when :namespace
          end
        end
      end

      def raise_arg_error(message)
        raise ArgumentError, message
      end
  end
end