class Match < ApplicationRecord
  belongs_to :player1, class_name: "User"
  belongs_to :player2, class_name: "User"

  enum :status, {
    ongoing: 0,
    player1_won: 1,
    player2_won: 2,
    draw: 3,
    abandoned: 4
  }

  before_validation :assign_uuid, on: :create

  validates :uuid, presence: true, uniqueness: true
  validates :status, presence: true
  validates :game_server, presence: true
  validates :started_at, presence: true
  validates :duration_seconds, numericality: { only_integer: true, greater_than_or_equal_to: 0 }, allow_nil: true
  validates :player1_rating_before, :player2_rating_before,
    presence: true, numericality: { only_integer: true }
  validates :player1_rating_change, :player2_rating_change,
    presence: true, numericality: { only_integer: true }
  validate :players_must_differ

  scope :finished, -> { where.not(finished_at: nil) }
  scope :for_user, ->(user_or_id) {
    id = user_or_id.is_a?(User) ? user_or_id.id : user_or_id
    where(player1_id: id).or(where(player2_id: id))
  }

  private

  def assign_uuid
    self.uuid ||= SecureRandom.uuid
  end

  def players_must_differ
    if player1_id.present? && player1_id == player2_id
      errors.add(:player2, "must differ from player1")
    end
  end
end