-- Extend the authenticated AI-output report boundary to generated meeting
-- documents. Existing ephemeral generations continue to require a live receipt;
-- meeting documents instead require an owned document plus its immutable
-- generation audit row.

BEGIN;

CREATE OR REPLACE FUNCTION public.submit_content_report_v1(
  p_actor_id uuid,
  p_idempotency_key uuid,
  p_kind text,
  p_source_type text,
  p_source_id uuid,
  p_reason text,
  p_comment text,
  p_snapshot text
) RETURNS jsonb
LANGUAGE plpgsql
SECURITY DEFINER
SET search_path = pg_catalog, public, auth, extensions
AS $$
DECLARE
  request_payload jsonb;
  request_digest text;
  existing_report public.content_reports%ROWTYPE;
  receipt public.content_generation_receipts%ROWTYPE;
  created_report public.content_reports%ROWTYPE;
  resolved_generation_receipt_id uuid;
  normalized_comment text;
  normalized_snapshot text;
BEGIN
  IF auth.role() <> 'service_role' THEN
    RAISE EXCEPTION 'service_role_required' USING ERRCODE = '42501';
  END IF;
  IF p_actor_id IS NULL OR p_idempotency_key IS NULL OR p_source_id IS NULL THEN
    RAISE EXCEPTION 'content_report_identifiers_required' USING ERRCODE = '22023';
  END IF;
  IF p_kind <> 'ai_output'
     OR p_source_type NOT IN (
       'talk_response', 'command_response', 'action_response', 'meeting_document'
     ) THEN
    RAISE EXCEPTION 'unsupported_content_report_source' USING ERRCODE = '22023';
  END IF;
  IF p_reason NOT IN (
    'harmful', 'sexual', 'hateful', 'violent', 'self_harm',
    'misinformation', 'privacy', 'spam', 'other'
  ) THEN
    RAISE EXCEPTION 'invalid_content_report_reason' USING ERRCODE = '22023';
  END IF;

  normalized_comment := CASE WHEN p_comment IS NULL THEN NULL ELSE trim(p_comment) END;
  normalized_snapshot := trim(coalesce(p_snapshot, ''));
  IF normalized_comment IS NOT NULL
     AND char_length(normalized_comment) NOT BETWEEN 1 AND 500 THEN
    RAISE EXCEPTION 'invalid_content_report_comment' USING ERRCODE = '22023';
  END IF;
  IF char_length(normalized_snapshot) NOT BETWEEN 1 AND 4000 THEN
    RAISE EXCEPTION 'invalid_content_report_snapshot' USING ERRCODE = '22023';
  END IF;

  request_payload := jsonb_build_object(
    'kind', p_kind,
    'source', jsonb_build_object('type', p_source_type, 'generationId', p_source_id),
    'reason', p_reason,
    'comment', normalized_comment,
    'snapshot', normalized_snapshot
  );
  request_digest := encode(extensions.digest(request_payload::text, 'sha256'), 'hex');

  -- One actor lock covers idempotency, duplicate-source detection and both
  -- rate windows. Concurrent calls cannot observe the same remaining slot.
  PERFORM pg_advisory_xact_lock(
    pg_catalog.hashtextextended('d3ro:content-report:' || p_actor_id::text, 0)
  );

  SELECT * INTO existing_report
  FROM public.content_reports
  WHERE reporter_id = p_actor_id AND idempotency_key = p_idempotency_key;

  IF existing_report.id IS NOT NULL THEN
    IF existing_report.request_hash <> request_digest THEN
      RAISE EXCEPTION 'content_report_idempotency_conflict' USING ERRCODE = 'PT409';
    END IF;
    RETURN jsonb_build_object(
      'reportId', existing_report.id,
      'status', 'submitted',
      'idempotent', true,
      'createdAt', existing_report.created_at
    );
  END IF;

  -- Keep account deletion from invalidating the reporter foreign key between
  -- source verification and the report insert. A deletion that wins first is
  -- intentionally indistinguishable from any other missing source.
  PERFORM 1 FROM auth.users WHERE id = p_actor_id FOR KEY SHARE;
  IF NOT FOUND THEN
    RAISE EXCEPTION 'content_report_source_not_found' USING ERRCODE = 'P0002';
  END IF;

  IF p_source_type = 'meeting_document' THEN
    -- A document is reportable only when it belongs to the actor and an
    -- immutable generation audit row proves that the document came from the
    -- server-side generation path. Manual or cross-user rows fail identically.
    PERFORM 1
    FROM public.meeting_documents AS document
    INNER JOIN public.meeting_document_generation_audit AS generation
      ON generation.document_id = document.id
     AND generation.user_id = document.user_id
     AND generation.meeting_id = document.meeting_id
    WHERE document.id = p_source_id
      AND document.user_id = p_actor_id
    FOR KEY SHARE OF document, generation;
    IF NOT FOUND THEN
      RAISE EXCEPTION 'content_report_source_not_found' USING ERRCODE = 'P0002';
    END IF;
    resolved_generation_receipt_id := NULL;
  ELSE
    SELECT * INTO receipt
    FROM public.content_generation_receipts
    WHERE id = p_source_id
      AND user_id = p_actor_id
      AND purpose = p_source_type
      AND expires_at > now()
    FOR KEY SHARE;
    IF receipt.id IS NULL THEN
      -- Missing, expired and cross-user receipts intentionally look identical.
      RAISE EXCEPTION 'content_report_source_not_found' USING ERRCODE = 'P0002';
    END IF;
    resolved_generation_receipt_id := receipt.id;
  END IF;

  IF EXISTS (
    SELECT 1 FROM public.content_reports
    WHERE reporter_id = p_actor_id
      AND source_type = p_source_type
      AND source_id = p_source_id
  ) THEN
    RAISE EXCEPTION 'content_report_source_already_reported' USING ERRCODE = 'PT409';
  END IF;

  IF (
    SELECT count(*) FROM public.content_reports
    WHERE reporter_id = p_actor_id
      AND created_at > now() - interval '1 hour'
  ) >= 10 OR (
    SELECT count(*) FROM public.content_reports
    WHERE reporter_id = p_actor_id
      AND created_at > now() - interval '24 hours'
  ) >= 30 THEN
    RAISE EXCEPTION 'content_report_rate_limited' USING ERRCODE = 'PT429';
  END IF;

  INSERT INTO public.content_reports(
    reporter_id, idempotency_key, request_hash, kind, source_type, source_id,
    generation_receipt_id, reason, reporter_comment, reported_snapshot,
    snapshot_sha256
  ) VALUES (
    p_actor_id, p_idempotency_key, request_digest, p_kind, p_source_type, p_source_id,
    resolved_generation_receipt_id, p_reason, normalized_comment, normalized_snapshot,
    encode(extensions.digest(normalized_snapshot, 'sha256'), 'hex')
  )
  RETURNING * INTO created_report;

  RETURN jsonb_build_object(
    'reportId', created_report.id,
    'status', 'submitted',
    'idempotent', false,
    'createdAt', created_report.created_at
  );
END;
$$;

REVOKE ALL ON FUNCTION public.submit_content_report_v1(
  uuid, uuid, text, text, uuid, text, text, text
) FROM PUBLIC, anon, authenticated;
GRANT EXECUTE ON FUNCTION public.submit_content_report_v1(
  uuid, uuid, text, text, uuid, text, text, text
) TO service_role;

COMMIT;