module Mutator
  class Transition
    attr_reader :to, :from, :machine

    def initialize(to:, from:, machine:)
      @to, @from, @machine = to, from, machine
    end

    def valid?
      transitions.present?
    end

    def stateholder
      machine.stateholder
    end

  protected

    def transitions
      machine.transitions.select do |t|
        t[:to] == to && t[:from].include?(from)
      end
    end
  end
end