-- ============================================================================
-- RAPPORT — Mitarbeiter einladen (Admin-Aktion)
-- ============================================================================
-- Two-Step-Flow (vom Frontend orchestriert):
--   1. Admin ruft `supabase.auth.signUp(email, tempPassword)` mit einem
--      temporären Client (ohne Session-persist), damit Admin-Session nicht
--      "übernommen" wird. → liefert neue user_id.
--   2. Admin ruft `attach_user_to_studio(user_id, studio_id, role, username, name)`
--      mit seinem eigenen Auth-Token. RPC prüft, dass Caller Admin im
--      Ziel-Studio ist, und legt Profil + Membership an.
--
-- Sicherheit: nur Admins eines Studios können dort Mitglieder hinzufügen.
-- `attach` ist idempotent (ON CONFLICT update), damit der Flow re-runnable ist.
-- ============================================================================

create or replace function attach_user_to_studio(
  p_user_id      uuid,
  p_studio_id    uuid,
  p_app_role_id  text,
  p_username     text,
  p_display_name text
)
  returns void
  language plpgsql
  security definer
as $$
declare
  v_caller_id uuid := auth.uid();
begin
  if v_caller_id is null then
    raise exception 'Authentication required';
  end if;

  -- Caller muss Admin in Ziel-Studio sein
  if not exists (
    select 1 from studio_members
    where user_id = v_caller_id
      and studio_id = p_studio_id
      and app_role_id = 'r-admin'
      and active = true
  ) then
    raise exception 'Only admins of the studio can invite members';
  end if;

  -- Profile
  insert into profiles (id, username, display_name)
  values (p_user_id, p_username, p_display_name)
  on conflict (id) do update set
    username = excluded.username,
    display_name = excluded.display_name;

  -- Membership (idempotent)
  insert into studio_members (studio_id, user_id, app_role_id)
  values (p_studio_id, p_user_id, p_app_role_id)
  on conflict (studio_id, user_id) do update set
    app_role_id = excluded.app_role_id,
    active = true;
end;
$$;

grant execute on function attach_user_to_studio(uuid, uuid, text, text, text) to authenticated;