module Teams
  class GenerateSlug
    def self.call(team)
      new(team).call
    end

    def initialize(team)
      @team = team
    end

    def call
      base = @team.name.to_s.parameterize.presence || "squadra"
      slug = base
      n = 2
      while conflict?(slug)
        slug = "#{base}-#{n}"
        n += 1
      end
      slug
    end

    private

    def conflict?(slug)
      scope = Team.where(slug: slug)
      scope = scope.where.not(id: @team.id) if @team.persisted?
      scope.exists?
    end
  end
end