--
-- This file is part of TALER
-- Copyright (C) 2014--2022 Taler Systems SA
--
-- TALER is free software; you can redistribute it and/or modify it under the
-- terms of the GNU General Public License as published by the Free Software
-- Foundation; either version 3, or (at your option) any later version.
--
-- TALER is distributed in the hope that it will be useful, but WITHOUT ANY
-- WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
-- A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
--
-- You should have received a copy of the GNU General Public License along with
-- TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
--


CREATE OR REPLACE FUNCTION create_table_known_coins(
  IN shard_suffix VARCHAR DEFAULT NULL
)
RETURNS VOID
LANGUAGE plpgsql
AS $$
DECLARE
  table_name VARCHAR default 'known_coins';
BEGIN

  PERFORM create_partitioned_table(
    'CREATE TABLE IF NOT EXISTS %I'
      '(known_coin_id BIGINT GENERATED BY DEFAULT AS IDENTITY' -- UNIQUE'
      ',denominations_serial INT8 NOT NULL' -- REFERENCES denominations (denominations_serial) ON DELETE CASCADE'
      ',coin_pub BYTEA NOT NULL PRIMARY KEY CHECK (LENGTH(coin_pub)=32)'
      ',age_commitment_hash BYTEA CHECK (LENGTH(age_commitment_hash)=32)'
      ',denom_sig BYTEA NOT NULL'
      ',remaining_val INT8 NOT NULL DEFAULT(0)'
      ',remaining_frac INT4 NOT NULL DEFAULT(0)'
    ') %s ;'
    ,table_name
    ,'PARTITION BY HASH (coin_pub)' -- FIXME: or include denominations_serial? or multi-level partitioning?;
    ,shard_suffix
  );

  table_name = concat_ws('_', table_name, shard_suffix);

END
$$;

CREATE OR REPLACE FUNCTION add_constraints_to_known_coins_partition(
  IN partition_suffix VARCHAR
)
RETURNS void
LANGUAGE plpgsql
AS $$
BEGIN
  EXECUTE FORMAT (
    'ALTER TABLE known_coins_' || partition_suffix || ' '
      'ADD CONSTRAINT known_coins_' || partition_suffix || '_known_coin_id_key '
        'UNIQUE (known_coin_id)'
  );
END
$$;