class MonsterSpawnCombat < ApplicationRecord
  belongs_to :monster_spawn
  belongs_to :character

  validates :hp_lost, numericality: { greater_than_or_equal_to: 0, only_integer: true }

  after_create :check_hp

  private
    def check_hp
      return if monster_spawn.alive?
      monster = monster_spawn.monster
      message_body_parts = {}

      # TODO: HACK (should allow multiple xp awards, eventually)
      xp_award_data = monster.whatnot[:awards].find { |a| a[:type] == "xp" }
      involved_character_ids = MonsterSpawnCombat.where(monster_spawn: monster_spawn).pluck(:character_id).uniq
      involved_characters = Character.where(id: involved_character_ids)
      involved_characters.each do |character|
        total_xp = xp_award_data[:base] * MonsterSpawnCombat.where(monster_spawn: monster_spawn, character: character).count
        character.add_skill_xp(xp_award_data[:gid], total_xp)
        message_body_parts[character.id] ||= []
        message_body_parts[character.id].push("You got #{total_xp} #{Skill.find_by_gid(xp_award_data[:gid]).name} XP.")
      end

      monster.whatnot[:awards]&.each do |data|
        case data[:type]
        when "item"
          return if rand > (data[:chance] || 1)

          if data[:table]
            table_roll = rand

            data[:table].sort_by { |t| -t[:score] }.each do |table_entry|
              min_quantity = table_entry[:min_quantity] || table_entry[:quantity] || 1
              max_quantity = table_entry[:max_quantity] || table_entry[:quantity] || 1
              quantity = rand(min_quantity..max_quantity)

              score = table_entry[:score]

              if table_roll >= score
                winning_character = involved_characters.sample
                item = Item.find_by_gid(data[:gid])
                winning_character.shift_item(item, quantity)
                message_body_parts[winning_character.id] ||= []
                message_body_parts[winning_character.id].push("You got #{quantity} #{item.name}.k")
                break
              end
            end
          else
            min_quantity = data[:min_quantity] || data[:quantity] || 1
            max_quantity = data[:max_quantity] || data[:quantity] || 1
            quantity = rand(min_quantity..max_quantity)
            winning_character = involved_characters.sample
            item = Item.find_by_gid(data[:gid])
            winning_character.shift_item(item, quantity)
            message_body_parts[winning_character.id] ||= []
            message_body_parts[winning_character.id].push("You got #{quantity} #{item.name}.")
            break
          end
        end
      end

      message_body_parts.each do |character_id, body_parts|
        if body_parts.any?
          Message.create(recipient_id: character_id, subject: "#{monster.name} slain", body: body_parts.join(", "))
        end
      end

      chat_message = ChatMessage.new(body: "The #{monster.name} in #{monster_spawn.location.name} has been slain!",
                                     chat_room: ChatRoom.find_by_gid("news"))
      if chat_message.save
        ChatRoomChannel.broadcast_chat_message(chat_message)
      end
    end
end