https://www.bloc.io/ruby-warrior/ Level 9

ruby-warrior.rb

class Player

  def initialize
    @max_health = 20
    @last_health = 20
    @critical_health = 10
    @direction = :forward  
  end

  def play_turn(warrior)
    @warrior = warrior

    if near_wall? 
      warrior.pivot!
    end
   
    queue_commands(create_commands).execute
  
    @last_health = @warrior.health
  end

  def create_commands
   walk = WalkCommand.new(@warrior, @direction)
   rescue_captive = RescueCommand.new(@warrior, @direction)
   heal = RestCommand.new(@warrior, @direction, taking_damage?)
   bow_attack = BowAttackCommand.new(@warrior, @direction, taking_damage?)
   attack = AttackCommand.new(@warrior, @direction)
   commands = [bow_attack, attack, heal, rescue_captive, walk]
  end 
   
  def queue_commands(commands)
   commands.each_cons(2) {|cmd, succ| cmd.set_successor(succ)}
   commands.first
  end
  
  def taking_damage?
    @warrior.health < @last_health
  end
    
  def near_wall?
    @warrior.feel(@direction).wall?
  end
end

class CommandBase
  def initialize(warrior, direction, under_attack = false )
    @warrior = warrior
    @wdirection = direction
    @under_attack = under_attack
  end
  def set_successor(command)
    @successor = command
  end
  def execute
    @warrior.walk!(@wdirection)
  end
  def can_execute_successor?
    @successor != nil
  end
end

class AttackCommand < CommandBase
  def execute
      return @warrior.attack! if can_sword_attack?
      @successor.execute if can_execute_successor?
  end
  def can_sword_attack?
    @warrior.feel(@wdirection).enemy?
  end
end

class BowAttackCommand < CommandBase
  def execute
    return @warrior.shoot! if can_attack_from_safety?
    @successor.execute if can_execute_successor?
  end
  def can_attack_from_safety?
    can_see_enemy? && !@under_attack
  end
  def can_see_enemy?
    @warrior.look(@wdirection).any? {|space| space.enemy?}
  end
end

class RescueCommand < CommandBase
  def execute
   return @warrior.rescue!(@wdirection) if can_rescue_captive?
    @successor.execute if can_execute_successor?  
  end
  
  def can_rescue_captive?
    @warrior.feel(@wdirection).captive?
  end
end

class RestCommand < CommandBase
  def execute
    return @warrior.walk!(:backward) if should_retreat?
    return @warrior.rest! if can_heal_safely?    
    @successor.execute if can_execute_successor?
  end
  def can_heal_safely?
    !@under_attack && is_wounded?
  end
  def should_retreat?
    @took_damage && has_critical_health?
  end
  def is_wounded? 
    @warrior.health < 20
  end
  def has_critical_health?
    @warrior.health < 10
  end
end

class WalkCommand < CommandBase
  def execute
    return @warrior.walk!(@wdirection) if can_walk?
    @successor.execute if can_execute_successor?
  end
  def can_walk?
    @warrior.feel(@wdirection).empty?
  end
end