-- Post opening balances (accounting.opening_balances) to the general ledger as a
-- single "Opening Balances" journal entry, so they flow into every GL-based
-- report (Trial Balance, General Ledger, P&L, Balance Sheet) from one source.
--
-- Scoped by accounting.gl_managed(): only companies whose GL we generate (no
-- imported/foreign journal entries). Imported-GL companies (e.g. Bridgewater,
-- Bent Oak) already carry their opening balances inside the imported GL, so we
-- must NOT post theirs again. Keyed external_source='acmacc_opening',
-- external_id=company_id (one entry per company) — idempotent.

create or replace function accounting.post_opening_balance_gl(_company_id uuid) returns void
language plpgsql security definer set search_path to 'public','accounting' as $$
declare _dt date; _je uuid; _has boolean;
begin
  perform accounting._gl_clear(_company_id, 'acmacc_opening', _company_id::text);
  if not accounting.gl_managed(_company_id) then return; end if;

  select exists (
    select 1 from accounting.opening_balances
    where company_id=_company_id and (coalesce(debit,0) <> 0 or coalesce(credit,0) <> 0)
  ) into _has;
  if not _has then return; end if;

  select as_of_date into _dt from accounting.opening_balances_setup where company_id=_company_id;
  _dt := coalesce(_dt, date_trunc('year', now())::date);

  insert into accounting.journal_entries (company_id, date, description, reference, external_source, external_id)
  values (_company_id, _dt, 'Opening Balances', 'OPENING', 'acmacc_opening', _company_id::text)
  returning id into _je;

  insert into accounting.journal_entry_lines (journal_entry_id, account_id, debit, credit, description)
  select _je, ob.account_id, coalesce(ob.debit,0), coalesce(ob.credit,0), 'Opening balance'
  from accounting.opening_balances ob
  where ob.company_id=_company_id and (coalesce(ob.debit,0) <> 0 or coalesce(ob.credit,0) <> 0);
end$$;

create or replace function accounting.tg_opening_balance_gl() returns trigger
language plpgsql security definer set search_path to 'public','accounting' as $$
begin
  begin
    perform accounting.post_opening_balance_gl(coalesce(new.company_id, old.company_id));
  exception when others then
    raise warning 'accounting: opening-balance GL post failed for %: %', coalesce(new.company_id, old.company_id), sqlerrm;
  end;
  return coalesce(new, old);
end$$;

drop trigger if exists trg_acct_opening_gl on accounting.opening_balances;
create trigger trg_acct_opening_gl after insert or update or delete on accounting.opening_balances
  for each row execute function accounting.tg_opening_balance_gl();

drop trigger if exists trg_acct_opening_setup_gl on accounting.opening_balances_setup;
create trigger trg_acct_opening_setup_gl after insert or update on accounting.opening_balances_setup
  for each row execute function accounting.tg_opening_balance_gl();