-- Deploy numerus:next_invoice_number to pg
-- requires: schema_numerus
-- requires: invoice_number_counter

begin;

set search_path to numerus, public;

create or replace function next_invoice_number(company integer, invoice_date date) returns text
as
$$
declare
	num integer;
	invoice_number text;
begin
	insert into invoice_number_counter (company_id, year, currval)
	values (next_invoice_number.company, date_part('year', invoice_date), 1)
	on conflict (company_id, year) do
	update
	set currval = invoice_number_counter.currval + 1
	returning currval
	into num;

	select to_char(invoice_date, to_char(num, 'FM' || replace(invoice_number_format, '"', '\""')))
	into invoice_number
	from company
	where company_id = next_invoice_number.company;

	return invoice_number;
end;
$$
language plpgsql;

revoke execute on function next_invoice_number(integer, date) from public;
grant execute on function next_invoice_number(integer, date) to invoicer;
grant execute on function next_invoice_number(integer, date) to admin;

commit;