https://www.bloc.io/ruby-warrior/#/

warrior.rb

class Player
  attr_reader :w

  def play_turn(w)
    @w = w

    # can't @foo ||= :bar
    if @dir.nil?
      @dir = :backward
    end
    if @turn.nil?
      @turn = 1
    end

    level1
    #level2
    #level3
    #level4
    #level5
    #level6
    #level7

    if w.respond_to?(:health)
      @last_health = w.health
    end
    @turn += 1
  end

  def level1
    @level = 1
    w.walk!
  end

  def level2
    @level = 2
    feel_and_action
  end

  def level3
    @level = 3
    if damaged? && !damaged_last_turn?
      w.rest!
    else
      feel_and_action
    end
  end

  def level4
    @level = 4
    if damaged? && !damaged_last_turn?
      w.rest!
    else
      feel_and_action
    end
  end

  def level5
    @level = 5
    if damaged? && !damaged_last_turn?
      w.rest!
    else
      feel_and_action
    end
  end

  def level6
    @level = 6
    if @turn < 50 && w.health < 20
      if damaged? && damaged_last_turn?
        w.walk!(:backward)
      else
        w.rest!
      end
    else
      feel_and_action
    end
  end

  def level7
    @level = 7
    if @turn < 50 && w.health < 20
      if damaged? && damaged_last_turn?
        w.walk!(:right)
      else
        w.rest!
      end
    else
      feel_and_action
    end
  end

  def feel_and_action()
    obj = w.feel(current_dir)
    is = proc {|meth| obj.respond_to?(meth) && obj.send(meth) ? obj : nil}

    case obj
    when is[:captive?]
      w.rescue! current_dir
    when is[:enemy?]
      w.attack! current_dir
    when is[:empty?], is[:stairs?]
      w.walk! current_dir
    when is[:wall?]
      w_pivot
    else
      w.walk! current_dir
    end
  end

  def damaged_last_turn?
    w.health < @last_health 
  end

  def damaged?
    w.health < 20 # TODO: how to get full of health?
  end

  def w_pivot
    if current_dir == :left
      @current_dir = :right
    else
      @current_dir = :left
    end
    if @level >= 7
      w.pivot!(current_dir)
    end
  end

  def current_dir
    if @current_dir == :left || @current_dir == :backward
      @level <= 6 ? :backward : :left
    else
      @level <= 6 ? :forward : :right
    end
  end
end