require_relative './errors/errors'

class Difficult
  include Errors

  DIFFICULTS = {
    easy: 'easy',
    medium: 'medium',
    hell: 'hell'
  }.freeze

  attr_reader :level

  def initialize(level)
    raise WrongDifficultError unless valid? level

    @level = level.downcase
  end

  def to_i
    case @level.downcase
    when DIFFICULTS[:hell] then 1
    when DIFFICULTS[:medium] then 2
    when DIFFICULTS[:easy] then 3
    end
  end

  private

  def valid?(level)
    level.is_a?(String) && DIFFICULTS.values.include?(level.downcase)
  end
end