module Validations
  def validate_name(name)
    raise "Name shouldn't be empty" if name.empty?
    raise 'Name should be string' if name.class != String
    raise 'Name should be at least 3 characters long' if name.length < 3
    raise "Name shouldn't be more than 20 characters long" if name.length > 20
  end

  def validate_guess(guess)
    raise "Name shouldn't be empty" if guess.empty?
    raise 'Name should be at least 3 characters long' if guess.length < 4
    raise 'Name shouldn\'t be more than 4 characters long' if guess.length > 4
  end

  def validate_difficulty(difficulty)
    raise "Input shouldn't be empty" if difficulty.empty?
    raise 'You should enter one of the following options: easy, medium, hell' unless difficulty.match?(/easy|medium|hell/)
  end
end