class MonsterSpawn < ApplicationRecord
  belongs_to :monster
  belongs_to :location
  has_many :monster_spawn_combats

  after_initialize :set_starting_hp
  after_create :send_chat_message

  validates :starting_hp, presence: true, numericality: { greater_than_or_equal_to: 1, only_integer: true }

  def alive?
    self.remaining_hp > 0
  end

  def remaining_hp
    self.starting_hp - MonsterSpawnCombat.where(monster_spawn: self).sum(:hp_lost)
  end

  private
    def set_starting_hp
      self.starting_hp = monster.max_hp
    end

    def send_chat_message
      chat_message = ChatMessage.new(body: "A leviathan has appeared in #{location.name}!",
                                     chat_room: ChatRoom.find_by_gid("news"))
      if chat_message.save
        ChatRoomChannel.broadcast_chat_message(chat_message)
      end
    end
end