--
-- 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_recoup_refresh(
  IN shard_suffix VARCHAR DEFAULT NULL
)
RETURNS VOID
LANGUAGE plpgsql
AS $$
DECLARE
  table_name VARCHAR DEFAULT 'recoup_refresh';
BEGIN

  PERFORM create_partitioned_table(
    'CREATE TABLE IF NOT EXISTS %I'
      '(recoup_refresh_uuid BIGINT GENERATED BY DEFAULT AS IDENTITY' -- UNIQUE'
      ',coin_pub BYTEA NOT NULL CHECK (LENGTH(coin_pub)=32)' -- REFERENCES known_coins (coin_pub)
      ',known_coin_id BIGINT NOT NULL' -- REFERENCES known_coins (known_coin_id) ON DELETE CASCADE
      ',coin_sig BYTEA NOT NULL CHECK(LENGTH(coin_sig)=64)'
      ',coin_blind BYTEA NOT NULL CHECK(LENGTH(coin_blind)=32)'
      ',amount_val INT8 NOT NULL'
      ',amount_frac INT4 NOT NULL'
      ',recoup_timestamp INT8 NOT NULL'
      ',rrc_serial INT8 NOT NULL' -- REFERENCES refresh_revealed_coins (rrc_serial) ON DELETE CASCADE -- UNIQUE'
    ') %s ;'
    ,table_name
    ,'PARTITION BY HASH (coin_pub)'
    ,shard_suffix
  );

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

  -- FIXME: any query using this index will be slow. Materialize index or change query?
  -- Also: which query uses this index?
  EXECUTE FORMAT (
    'CREATE INDEX IF NOT EXISTS ' || table_name || '_by_rrc_serial_index '
    'ON ' || table_name || ' '
    '(rrc_serial);'
  );
  EXECUTE FORMAT (
    'CREATE INDEX IF NOT EXISTS ' || table_name || '_by_coin_pub_index '
    'ON ' || table_name || ' '
    '(coin_pub);'
  );

END
$$;

CREATE OR REPLACE FUNCTION add_constraints_to_recoup_refresh_partition(
  IN partition_suffix VARCHAR
)
RETURNS VOID
LANGUAGE plpgsql
AS $$
BEGIN
  EXECUTE FORMAT (
    'ALTER TABLE recoup_refresh_' || partition_suffix || ' '
      'ADD CONSTRAINT recoup_refresh_' || partition_suffix || '_recoup_refresh_uuid_key '
        'UNIQUE (recoup_refresh_uuid) '
  );
END
$$;