-- 회의 생성 시 문서 템플릿은 선택 사항이다. 템플릿 없이도 회의를 시작할 수
-- 있어야 하며(데스크톱 동작과 동일), 문서 생성 시점에 사용자 템플릿 라이브러리
-- 에서 템플릿이 해결된다. meetings.template_id 컬럼과 소유권/생성 무결성
-- 트리거(enforce_meeting_template_owner_v1, enforce_meeting_creation_identity_v1)
-- 는 이미 NULL을 허용하므로 생성 RPC의 인자 검증만 완화한다.
--
-- 주의: idempotency 요청 해시에 template_id가 포함되므로, 같은 idempotency
-- 키를 NULL/NOT NULL 템플릿으로 재시도하면 creation_request_hash 불일치로
-- meeting_creation_idempotency_conflict가 발생한다 — 의도된 방어 동작이다.

CREATE OR REPLACE FUNCTION public.mobile_create_meeting_workspace_v2(
  p_title text,
  p_attendees jsonb,
  p_language text,
  p_template_id uuid,
  p_idempotency_key uuid
)
RETURNS public.meetings
LANGUAGE plpgsql
SECURITY DEFINER
SET search_path = pg_catalog, public, auth, extensions
AS $$
DECLARE
  actor_id uuid := auth.uid();
  safe_title text := regexp_replace(trim(p_title), '[[:space:]]+', ' ', 'g');
  safe_language text := lower(trim(p_language));
  safe_attendees jsonb;
  request_digest text;
  created public.meetings;
BEGIN
  IF actor_id IS NULL THEN
    RAISE EXCEPTION 'authentication_required' USING ERRCODE = '42501';
  END IF;
  IF p_idempotency_key IS NULL THEN
    RAISE EXCEPTION 'meeting_creation_identifiers_required' USING ERRCODE = '22023';
  END IF;
  IF p_title IS NULL OR char_length(safe_title) NOT BETWEEN 1 AND 160 THEN
    RAISE EXCEPTION 'invalid_meeting_title' USING ERRCODE = '22023';
  END IF;
  IF p_language IS NULL OR safe_language NOT IN ('ko', 'en', 'ja', 'zh-cn') THEN
    RAISE EXCEPTION 'invalid_meeting_language' USING ERRCODE = '22023';
  END IF;
  IF NOT public.is_valid_meeting_attendees_v1(p_attendees) THEN
    RAISE EXCEPTION 'invalid_meeting_attendees' USING ERRCODE = '22023';
  END IF;
  IF p_template_id IS NOT NULL AND NOT EXISTS (
    SELECT 1
    FROM public.user_templates
    WHERE id = p_template_id
      AND user_id = actor_id
      AND template_kind = 'meeting_document'
  ) THEN
    RAISE EXCEPTION 'meeting_template_not_found' USING ERRCODE = 'P0002';
  END IF;

  PERFORM set_config('d3ro.meeting_creation_actor', actor_id::text, true);

  SELECT coalesce(
    jsonb_agg(
      to_jsonb(regexp_replace(trim(item.value #>> '{}'), '[[:space:]]+', ' ', 'g'))
      ORDER BY item.ordinality
    ),
    '[]'::jsonb
  )
  INTO safe_attendees
  FROM jsonb_array_elements(p_attendees) WITH ORDINALITY AS item(value, ordinality);

  request_digest := encode(extensions.digest(
    jsonb_build_object(
      'title', safe_title,
      'attendees', safe_attendees,
      'language', safe_language,
      'template_id', p_template_id
    )::text,
    'sha256'
  ), 'hex');

  INSERT INTO public.meetings(
    user_id, title, status, language, attendees, template_id,
    creation_idempotency_key, creation_request_hash
  )
  VALUES (
    actor_id, safe_title, 'recording', safe_language, safe_attendees,
    p_template_id, p_idempotency_key, request_digest
  )
  ON CONFLICT (user_id, creation_idempotency_key)
    WHERE creation_idempotency_key IS NOT NULL
  DO NOTHING
  RETURNING * INTO created;

  IF created.id IS NULL THEN
    SELECT * INTO created
    FROM public.meetings
    WHERE user_id = actor_id
      AND creation_idempotency_key = p_idempotency_key;
    IF created.id IS NULL THEN
      RAISE EXCEPTION 'meeting_creation_retry_state_missing' USING ERRCODE = 'PT409';
    END IF;
    IF created.creation_request_hash <> request_digest THEN
      RAISE EXCEPTION 'meeting_creation_idempotency_conflict' USING ERRCODE = 'PT409';
    END IF;
  END IF;

  RETURN created;
END;
$$;

REVOKE ALL ON FUNCTION public.mobile_create_meeting_workspace_v2(text, jsonb, text, uuid, uuid)
  FROM PUBLIC, anon;
GRANT EXECUTE ON FUNCTION public.mobile_create_meeting_workspace_v2(text, jsonb, text, uuid, uuid)
  TO authenticated;