module Contentful
  module Management
    # Utility methods used by the contentful management gem
    module Support
      class << self
        # Transforms CamelCase into snake_case (taken from zucker)
        def snakify(object)
          snake = String(object).gsub(/(?<!^)[A-Z]/) { "_#$&" }
          snake.downcase
        end

        # Merges two hashes with recursion
        def deep_hash_merge(query_hash, attribute_hash)
          query_hash.merge(attribute_hash) do |_key, oldval, newval|
            oldval = oldval.to_hash if oldval.respond_to?(:to_hash)
            newval = newval.to_hash if newval.respond_to?(:to_hash)
            oldval.class.to_s == 'Hash' && newval.class.to_s == 'Hash' ? deep_hash_merge(oldval, newval) : newval
          end
        end

        def normalize_select!(parameters)
          return parameters unless parameters.key?(:select)

          parameters[:select] = parameters[:select].split(',').map(&:strip) if parameters[:select].is_a? String
          parameters[:select] = parameters[:select].reject { |p| p.start_with?('sys.') }
          parameters[:select] << 'sys' unless parameters[:select].include?('sys')
          parameters[:select] = parameters[:select].join(',')

          parameters
        end
      end
    end
  end
end