ALTER TABLE public.board_vote_responses
  ADD COLUMN IF NOT EXISTS board_member_id uuid REFERENCES public.board_members(id) ON DELETE CASCADE;

ALTER TABLE public.board_vote_responses
  ALTER COLUMN user_id DROP NOT NULL;

ALTER TABLE public.board_vote_responses
  DROP CONSTRAINT IF EXISTS board_vote_responses_board_vote_id_user_id_key;

CREATE UNIQUE INDEX IF NOT EXISTS board_vote_responses_unique_user
  ON public.board_vote_responses(board_vote_id, user_id)
  WHERE user_id IS NOT NULL;

CREATE UNIQUE INDEX IF NOT EXISTS board_vote_responses_unique_member
  ON public.board_vote_responses(board_vote_id, board_member_id)
  WHERE board_member_id IS NOT NULL;

ALTER TABLE public.board_vote_responses
  ADD CONSTRAINT board_vote_responses_identity_required
  CHECK (user_id IS NOT NULL OR board_member_id IS NOT NULL);

CREATE OR REPLACE FUNCTION public.record_board_vote_by_token(p_token uuid, p_option text)
 RETURNS jsonb
 LANGUAGE plpgsql
 SECURITY DEFINER
 SET search_path TO 'public'
AS $function$
DECLARE
  v_token RECORD;
  v_vote RECORD;
  v_member RECORD;
BEGIN
  SELECT * INTO v_token FROM public.board_vote_email_tokens WHERE token = p_token;
  IF v_token IS NULL THEN
    RETURN jsonb_build_object('ok', false, 'error', 'Invalid token');
  END IF;
  IF v_token.voted_at IS NOT NULL THEN
    RETURN jsonb_build_object('ok', false, 'error', 'Vote already recorded', 'already_voted', true);
  END IF;

  SELECT * INTO v_vote FROM public.board_votes WHERE id = v_token.board_vote_id;
  IF v_vote.status <> 'open' THEN
    RETURN jsonb_build_object('ok', false, 'error', 'Voting is closed for this item');
  END IF;
  IF NOT (p_option = ANY(v_vote.vote_options)) THEN
    RETURN jsonb_build_object('ok', false, 'error', 'Invalid vote option');
  END IF;

  SELECT * INTO v_member FROM public.board_members WHERE id = v_token.board_member_id;

  -- Record token usage
  UPDATE public.board_vote_email_tokens
  SET voted_at = now(), vote_option = p_option
  WHERE id = v_token.id;

  -- Mirror into board_vote_responses so it shows in the tally
  IF v_member.user_id IS NOT NULL THEN
    INSERT INTO public.board_vote_responses (board_vote_id, user_id, board_member_id, vote_option)
    VALUES (v_token.board_vote_id, v_member.user_id, v_token.board_member_id, p_option)
    ON CONFLICT (board_vote_id, user_id) WHERE user_id IS NOT NULL
    DO UPDATE SET vote_option = EXCLUDED.vote_option, updated_at = now();
  ELSE
    INSERT INTO public.board_vote_responses (board_vote_id, board_member_id, vote_option)
    VALUES (v_token.board_vote_id, v_token.board_member_id, p_option)
    ON CONFLICT (board_vote_id, board_member_id) WHERE board_member_id IS NOT NULL
    DO UPDATE SET vote_option = EXCLUDED.vote_option, updated_at = now();
  END IF;

  RETURN jsonb_build_object('ok', true);
END;
$function$;