class Player
  def initialize()
    @max_health = nil
    @prev_health = nil
    @warrior = nil
    @direction = :forward
    @health_history = []
    @direction_history = []
  end
 
  def play_turn(warrior)
    @max_health ||= warrior.health
 
    @warrior = warrior
    updateHistory
 
#?     return rescue! if captive_nearby?
    return walk! if feel.stairs?
    return rest! if needRest && !beingShotAt
    return attack! unless feel.empty?
#?     find_empty_direction
 
    reverse_direction if walking_into_fire
    walk!
  end
 
  def needRest
    @warrior.health < @max_health
  end
 
  def beingShotAt
    @warrior.health < @prev_health
  end
 
  def updateHistory
    @prev_health = @curr_health
    @curr_health = @warrior.health
    @health_history << @curr_health
    @direction = @warrior.direction_of_stairs
#?     @direction_history << @direction
  end
 
  def walk!
    @warrior.walk! @direction
  end
  def attack!
    @warrior.attack! @direction
  end
  def rescue!
    @warrior.rescue! @direction
  end
  def rest!
    @warrior.rest!
  end
  def feel
    @warrior.feel @direction
  end
 
  def captive_nearby?
    [:forward, :left, :right, :backward].each do |dir|
      return @direction = dir if @warrior.feel(dir).captive?
    end
  end
 
  def find_empty_direction
    [:forward, :left, :right, :backward].each do |dir|
      return @direction = dir if @warrior.feel(dir).empty?
    end
  end
 
  def walking_into_fire
    return false if @direction_history[-1] != @direction_history[-2] ||
        @direction_history[-2] != @direction_history[-3]
    @health_history[-1] < @health_history[-2] && @health_history[-2] < @health_history[-3]
  rescue
    false
  end
 
  def reverse_direction
    @direction = (@direction == :forward) ? :backward : :forward
  end
end