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

  PERFORM create_partitioned_table(
    'CREATE TABLE IF NOT EXISTS %I '
      '(purse_merge_request_serial_id BIGINT GENERATED BY DEFAULT AS IDENTITY '-- UNIQUE
      ',partner_serial_id INT8' -- REFERENCES partners(partner_serial_id) ON DELETE CASCADE
      ',reserve_pub BYTEA NOT NULL CHECK(length(reserve_pub)=32)'--REFERENCES reserves (reserve_pub) ON DELETE CASCADE
      ',purse_pub BYTEA NOT NULL CHECK (LENGTH(purse_pub)=32)' --REFERENCES purse_requests (purse_pub) ON DELETE CASCADE
      ',merge_sig BYTEA NOT NULL CHECK (LENGTH(merge_sig)=64)'
      ',merge_timestamp INT8 NOT NULL'
      ',PRIMARY KEY (purse_pub)'
    ') %s ;'
    ,table_name
    ,'PARTITION BY HASH (purse_pub)'
    ,shard_suffix
  );

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

  -- FIXME: change to materialized index by reserve_pub!
  EXECUTE FORMAT (
    'CREATE INDEX IF NOT EXISTS ' || table_name || '_reserve_pub '
    'ON ' || table_name || ' '
    '(reserve_pub);'
  );
  EXECUTE FORMAT (
    'COMMENT ON INDEX ' || table_name || '_reserve_pub '
    'IS ' || quote_literal('needed in reserve history computation') || ';'
  );

END
$$;

CREATE OR REPLACE FUNCTION add_constraints_to_purse_merges_partition(
  IN partition_suffix VARCHAR
)
RETURNS VOID
LANGUAGE plpgsql
AS $$
BEGIN
  EXECUTE FORMAT (
    'ALTER TABLE purse_merges_' || partition_suffix || ' '
      'ADD CONSTRAINT purse_merges_' || partition_suffix || '_purse_merge_request_serial_id_key '
        'UNIQUE (purse_merge_request_serial_id) '
  );
END
$$;


INSERT INTO exchange_tables
    (name
    ,version
    ,action
    ,partitioned
    ,by_range)
  VALUES
    ('purse_merges'
    ,'exchange-0002'
    ,'create'
    ,TRUE
    ,FALSE);