-- ============================================================================
-- Team activity feed
-- ----------------------------------------------------------------------------
-- Adds a team-scoped activity/comment stream so members can see shared notes
-- and system events (member changes, invites, shared meetings/documents).
--
-- Follows the locked RPC write model established in
-- 20260821000008_atomic_team_security.sql: team tables have no direct
-- INSERT/UPDATE/DELETE policies, so all writes go through SECURITY DEFINER
-- RPCs. Reads are RLS-filtered to team members via public.user_team_ids().
--
-- Also registers the team tables (and this one) with the realtime publication.
-- Previously teams/team_members/team_invites were never added, so the mobile
-- team Realtime subscriptions could not receive postgres_changes events.
-- ============================================================================

BEGIN;

CREATE TABLE IF NOT EXISTS public.team_activities (
  id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
  team_id uuid NOT NULL REFERENCES public.teams(id) ON DELETE CASCADE,
  actor_id uuid REFERENCES auth.users(id) ON DELETE SET NULL,
  kind text NOT NULL CHECK (
    kind IN (
      'note',
      'member_joined',
      'member_left',
      'invite_created',
      'meeting_shared',
      'document_shared'
    )
  ),
  body text CHECK (body IS NULL OR char_length(body) <= 2000),
  metadata jsonb NOT NULL DEFAULT '{}'::jsonb,
  created_at timestamptz NOT NULL DEFAULT now()
);

CREATE INDEX IF NOT EXISTS idx_team_activities_team_created
  ON public.team_activities (team_id, created_at DESC);

ALTER TABLE public.team_activities ENABLE ROW LEVEL SECURITY;

DROP POLICY IF EXISTS team_activities_read_member ON public.team_activities;
CREATE POLICY team_activities_read_member ON public.team_activities
  FOR SELECT
  TO authenticated
  USING (team_id IN (SELECT public.user_team_ids(auth.uid())));

-- Writes are RPC-only: no INSERT/UPDATE/DELETE policies exist on purpose.
GRANT SELECT ON public.team_activities TO authenticated;
REVOKE INSERT, UPDATE, DELETE ON public.team_activities FROM PUBLIC, anon, authenticated;

CREATE OR REPLACE FUNCTION public.create_team_activity(
  p_team_id uuid,
  p_kind text,
  p_body text,
  p_metadata jsonb DEFAULT '{}'::jsonb
)
RETURNS jsonb
LANGUAGE plpgsql
SECURITY DEFINER
SET search_path = ''
AS $$
DECLARE
  current_user_id uuid := auth.uid();
  member_role text;
  normalized_body text;
  new_id uuid;
BEGIN
  IF current_user_id IS NULL THEN
    RAISE EXCEPTION 'authentication_required' USING ERRCODE = '42501';
  END IF;
  IF p_kind IS NULL OR p_kind NOT IN (
    'note',
    'member_joined',
    'member_left',
    'invite_created',
    'meeting_shared',
    'document_shared'
  ) THEN
    RAISE EXCEPTION 'invalid_activity_kind' USING ERRCODE = '22023';
  END IF;
  normalized_body := nullif(btrim(coalesce(p_body, '')), '');
  IF normalized_body IS NOT NULL AND char_length(normalized_body) > 2000 THEN
    RAISE EXCEPTION 'activity_body_too_long' USING ERRCODE = '22001';
  END IF;
  IF normalized_body IS NULL AND p_kind = 'note' THEN
    RAISE EXCEPTION 'activity_body_required' USING ERRCODE = '22023';
  END IF;
  PERFORM pg_advisory_xact_lock(hashtextextended(p_team_id::text, 73053));
  SELECT role INTO member_role FROM public.team_members
  WHERE team_id = p_team_id AND user_id = current_user_id;
  IF member_role IS NULL THEN
    RAISE EXCEPTION 'team_member_required' USING ERRCODE = '42501';
  END IF;
  INSERT INTO public.team_activities (team_id, actor_id, kind, body, metadata)
  VALUES (
    p_team_id,
    current_user_id,
    p_kind,
    normalized_body,
    coalesce(p_metadata, '{}'::jsonb)
  )
  RETURNING id INTO new_id;
  RETURN jsonb_build_object(
    'id', new_id,
    'team_id', p_team_id,
    'actor_id', current_user_id,
    'kind', p_kind,
    'body', normalized_body,
    'created_at', now()
  );
END;
$$;

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

-- Realtime: register team tables + activities. ALTER PUBLICATION ADD TABLE has
-- no IF NOT EXISTS, so probe pg_publication_tables first.
DO $$
DECLARE
  t text;
BEGIN
  FOR t IN
    SELECT unnest(ARRAY[
      'team_activities',
      'teams',
      'team_members',
      'team_invites'
    ])
  LOOP
    IF NOT EXISTS (
      SELECT 1
      FROM pg_publication_tables
      WHERE pubname    = 'supabase_realtime'
        AND schemaname = 'public'
        AND tablename  = t
    ) THEN
      EXECUTE format(
        'ALTER PUBLICATION supabase_realtime ADD TABLE public.%I',
        t
      );
    END IF;
  END LOOP;
END $$;

COMMIT;