class GameParticipant < ApplicationRecord
  belongs_to :game
  belongs_to :user

  validates :status, inclusion: { in: %w[joined ready finished] }
  validates :user_id, uniqueness: { scope: :game_id }
  validates :power, uniqueness: { scope: :game_id }, allow_nil: true

  # ステータス管理メソッド
  def joined?
    status == 'joined'
  end

  def ready?
    status == 'ready'
  end

  def finished?
    status == 'finished'
  end

  # パワー選択関連
  def has_selected_power?
    power.present?
  end

  def select_power!(power_name)
    update!(power: power_name, status: 'ready')
  end

  # ゲーム参加メソッド
  class << self
    def join_game!(game, user, password = nil)
      # パスワードチェック（プレイヤーモードの場合）
      if game.player_mode? && game.password.present?
        raise "Invalid password" unless game.password == password
      end

      # 既存参加チェック
      if game.game_participants.exists?(user_id: user.id)
        raise "Already joined this game"
      end

      # 定員チェック
      if game.player_mode? && game.full?
        raise "Game is full"
      end

      create!(game: game, user: user, joined_at: Time.current, status: 'joined')
    end
  end
end