module Teams
  class StaffAssignment
    def self.call(team:, user:, staff_kind: "transmission", membership: nil)
      new(team: team, user: user, staff_kind: staff_kind, membership: membership).call
    end

    def initialize(team:, user:, staff_kind: "transmission", membership: nil)
      @team = team
      @user = user
      @staff_kind = "transmission"
      @membership = membership
    end

    def call
      StaffEmailValidator.assert_available!(
        team: @team, email: @user.email, except_user: @user
      )

      ut = @membership || @user.user_teams.find_by!(team: @team)
      return ut if ut.staff_kind == "transmission"

      Entitlements.new(@team).assert_can_invite!
      ut.update!(staff_kind: "transmission")
      ut
    end
  end
end