module MotherBrain::API::Validators
  # Coerce a URI friendly version string into a SemVer string
  #
  # @example coercing a URI friendly string into a SemVer string
  #
  #   "1_0_0" => "1.0.0"
  class SemVer < Grape::Validations::Validator
    def validate_param!(attr_name, params)
      return nil if params[attr_name].nil?

      ver_string = params[attr_name].gsub('_', '.')
      Solve::Version.split(ver_string)
      params[attr_name] = ver_string
    rescue Solve::Errors::InvalidVersionFormat => ex
      throw :error, status: 400, message: ex.to_s
    end
  end
end