--
-- 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_wad_in_entries(
  IN partition_suffix VARCHAR DEFAULT NULL
)
RETURNS VOID
LANGUAGE plpgsql
AS $$
DECLARE
  table_name VARCHAR DEFAULT 'wad_in_entries';
BEGIN
  PERFORM create_partitioned_table(
    'CREATE TABLE %I '
      '(wad_in_entry_serial_id BIGINT GENERATED BY DEFAULT AS IDENTITY'
      ',wad_in_serial_id INT8'
      ',reserve_pub BYTEA NOT NULL CHECK(LENGTH(reserve_pub)=32)'
      ',purse_pub BYTEA PRIMARY KEY CHECK(LENGTH(purse_pub)=32)'
      ',h_contract BYTEA NOT NULL CHECK(LENGTH(h_contract)=64)'
      ',purse_expiration INT8 NOT NULL'
      ',merge_timestamp INT8 NOT NULL'
      ',amount_with_fee_val INT8 NOT NULL'
      ',amount_with_fee_frac INT4 NOT NULL'
      ',wad_fee_val INT8 NOT NULL'
      ',wad_fee_frac INT4 NOT NULL'
      ',deposit_fees_val INT8 NOT NULL'
      ',deposit_fees_frac INT4 NOT NULL'
      ',reserve_sig BYTEA NOT NULL CHECK (LENGTH(reserve_sig)=64)'
      ',purse_sig BYTEA NOT NULL CHECK (LENGTH(purse_sig)=64)'
    ') %s ;'
    ,table_name
    ,'PARTITION BY HASH (purse_pub)'
    ,partition_suffix
  );
  PERFORM comment_partitioned_table(
     'list of purses aggregated in a wad according to the sending exchange'
    ,table_name
    ,partition_suffix
  );
  PERFORM comment_partitioned_column(
     'wad for which the given purse was included in the aggregation'
    ,'wad_in_serial_id'
    ,table_name
    ,partition_suffix
  );
  PERFORM comment_partitioned_column(
     'target account of the purse (must be at the local exchange)'
    ,'reserve_pub'
    ,table_name
    ,partition_suffix
  );
  PERFORM comment_partitioned_column(
     'public key of the purse that was merged'
    ,'purse_pub'
    ,table_name
    ,partition_suffix
  );
  PERFORM comment_partitioned_column(
    'hash of the contract terms of the purse'
    ,'h_contract'
    ,table_name
    ,partition_suffix
  );
  PERFORM comment_partitioned_column(
     'Time when the purse was set to expire'
    ,'purse_expiration'
    ,table_name
    ,partition_suffix
  );
  PERFORM comment_partitioned_column(
     'Time when the merge was approved'
    ,'merge_timestamp'
    ,table_name
    ,partition_suffix
  );
  PERFORM comment_partitioned_column(
     'Total amount in the purse'
    ,'amount_with_fee_val'
    ,table_name
    ,partition_suffix
  );
  PERFORM comment_partitioned_column(
     'Total wad fees paid by the purse'
    ,'wad_fee_val'
    ,table_name
    ,partition_suffix
  );
  PERFORM comment_partitioned_column(
     'Total deposit fees paid when depositing coins into the purse'
    ,'deposit_fees_val'
    ,table_name
    ,partition_suffix
  );
  PERFORM comment_partitioned_column(
     'Signature by the receiving reserve, of purpose TALER_SIGNATURE_ACCOUNT_MERGE'
    ,'reserve_sig'
    ,table_name
    ,partition_suffix
  );
  PERFORM comment_partitioned_column(
     'Signature by the purse of purpose TALER_SIGNATURE_PURSE_MERGE'
    ,'purse_sig'
    ,table_name
    ,partition_suffix
  );
END $$;


CREATE FUNCTION constrain_table_wad_in_entries(
  IN partition_suffix VARCHAR
)
RETURNS VOID
LANGUAGE plpgsql
AS $$
DECLARE
  table_name VARCHAR DEFAULT 'wad_in_entries';
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 || '_wad_in_entry_serial_id_key'
    ' UNIQUE (wad_in_entry_serial_id) '
  );
END $$;


CREATE FUNCTION foreign_table_wad_in_entries()
RETURNS VOID
LANGUAGE plpgsql
AS $$
DECLARE
  table_name VARCHAR DEFAULT 'wad_in_entries';
BEGIN
  EXECUTE FORMAT (
    'ALTER TABLE ' || table_name ||
    ' ADD CONSTRAINT ' || table_name || '_foreign_wad_in'
    ' FOREIGN KEY(wad_in_serial_id)'
    ' REFERENCES wads_in (wad_in_serial_id) ON DELETE CASCADE'
  );
END $$;


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