--
-- 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 FUNCTION create_table_purse_merges(
  IN partition_suffix TEXT DEFAULT NULL
)
RETURNS VOID
LANGUAGE plpgsql
AS $$
DECLARE
  table_name TEXT DEFAULT 'purse_merges';
BEGIN
  PERFORM create_partitioned_table(
    'CREATE TABLE %I '
    '(purse_merge_request_serial_id BIGINT GENERATED BY DEFAULT AS IDENTITY'
    ',partner_serial_id INT8'
    ',reserve_pub BYTEA NOT NULL CHECK(length(reserve_pub)=32)'
    ',purse_pub BYTEA NOT NULL CHECK (LENGTH(purse_pub)=32)'
    ',merge_sig BYTEA NOT NULL CHECK (LENGTH(merge_sig)=64)'
    ',merge_timestamp INT8 NOT NULL'
    ',PRIMARY KEY (purse_pub)'
    ') %s ;'
    ,table_name
    ,'PARTITION BY HASH (purse_pub)'
    ,partition_suffix
  );
  PERFORM comment_partitioned_table(
     'Merge requests where a purse-owner requested merging the purse into the account'
    ,table_name
    ,partition_suffix
  );
  PERFORM comment_partitioned_column(
     'identifies the partner exchange, NULL in case the target reserve lives at this exchange'
    ,'partner_serial_id'
    ,table_name
    ,partition_suffix
  );
  PERFORM comment_partitioned_column(
     'public key of the target reserve'
    ,'reserve_pub'
    ,table_name
    ,partition_suffix
  );
  PERFORM comment_partitioned_column(
     'public key of the purse'
    ,'purse_pub'
    ,table_name
    ,partition_suffix
  );
  PERFORM comment_partitioned_column(
     'signature by the purse private key affirming the merge, of type TALER_SIGNATURE_WALLET_PURSE_MERGE'
    ,'merge_sig'
    ,table_name
    ,partition_suffix
  );
  PERFORM comment_partitioned_column(
     'when was the merge message signed'
    ,'merge_timestamp'
    ,table_name
    ,partition_suffix
  );
END
$$;


CREATE FUNCTION constrain_table_purse_merges(
  IN partition_suffix TEXT
)
RETURNS VOID
LANGUAGE plpgsql
AS $$
DECLARE
  table_name TEXT DEFAULT 'purse_merges';
BEGIN
  table_name = concat_ws('_', table_name, partition_suffix);
  -- FIXME: change to materialized index by reserve_pub!
  EXECUTE FORMAT (
    'CREATE INDEX ' || table_name || '_reserve_pub '
    'ON ' || table_name || ' '
    '(reserve_pub);'
  );
  EXECUTE FORMAT (
    'COMMENT ON INDEX ' || table_name || '_reserve_pub '
    'IS ' || quote_literal('needed in reserve history computation') || ';'
  );
  EXECUTE FORMAT (
    'ALTER TABLE ' || table_name ||
    ' ADD CONSTRAINT ' || table_name || '_purse_merge_request_serial_id_key'
    ' UNIQUE (purse_merge_request_serial_id) '
  );
END
$$;


CREATE FUNCTION foreign_table_purse_merges()
RETURNS VOID
LANGUAGE plpgsql
AS $$
DECLARE
  table_name TEXT DEFAULT 'purse_merges';
BEGIN
  EXECUTE FORMAT (
    'ALTER TABLE ' || table_name ||
    ' ADD CONSTRAINT ' || table_name || '_foreign_partner_serial_id'
    ' FOREIGN KEY (partner_serial_id) '
    ' REFERENCES partners(partner_serial_id) ON DELETE CASCADE'
    ',ADD CONSTRAINT ' || table_name || '_foreign_purse_pub'
    ' FOREIGN KEY (purse_pub) '
    ' REFERENCES purse_requests (purse_pub) ON DELETE CASCADE'
  );
END
$$;


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