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--
-- 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 exchange_do_reserve_open(
IN in_reserve_pub BYTEA,
IN in_total_paid taler_amount,
IN in_reserve_payment taler_amount,
IN in_min_purse_limit INT4,
IN in_default_purse_limit INT4,
IN in_reserve_sig BYTEA,
IN in_desired_expiration INT8,
IN in_reserve_gc_delay INT8,
IN in_now INT8,
IN in_open_fee taler_amount,
OUT out_open_cost taler_amount,
OUT out_final_expiration INT8,
OUT out_no_reserve BOOLEAN,
OUT out_no_funds BOOLEAN,
OUT out_reserve_balance taler_amount)
LANGUAGE plpgsql
AS $$
DECLARE
my_balance taler_amount;
my_cost taler_amount;
my_cost_tmp INT8;
my_years_tmp INT4;
my_years INT4;
my_needs_update BOOL;
my_expiration_date INT8;
reserve RECORD;
BEGIN
SELECT current_balance
,expiration_date
,purses_allowed
INTO reserve
FROM reserves
WHERE reserve_pub=in_reserve_pub;
IF NOT FOUND
THEN
RAISE NOTICE 'reserve not found';
out_no_reserve = TRUE;
out_no_funds = TRUE;
out_reserve_balance.val = 0;
out_reserve_balance.frac = 0;
out_open_cost.val = 0;
out_open_cost.frac = 0;
out_final_expiration = 0;
RETURN;
END IF;
out_no_reserve = FALSE;
out_reserve_balance = reserve.current_balance;
-- Do not allow expiration time to start in the past already
IF (reserve.expiration_date < in_now)
THEN
my_expiration_date = in_now;
ELSE
my_expiration_date = reserve.expiration_date;
END IF;
my_cost.val = 0;
my_cost.frac = 0;
my_needs_update = FALSE;
my_years = 0;
-- Compute years based on desired expiration time
IF (my_expiration_date < in_desired_expiration)
THEN
my_years = (31535999999999 + in_desired_expiration - my_expiration_date) / 31536000000000;
reserve.purses_allowed = in_default_purse_limit;
my_expiration_date = my_expiration_date + 31536000000000 * my_years;
END IF;
-- Increase years based on purses requested
IF (reserve.purses_allowed < in_min_purse_limit)
THEN
my_years = (31535999999999 + in_desired_expiration - in_now) / 31536000000000;
my_expiration_date = in_now + 31536000000000 * my_years;
my_years_tmp = (in_min_purse_limit + in_default_purse_limit - reserve.purses_allowed - 1) / in_default_purse_limit;
my_years = my_years + my_years_tmp;
reserve.purses_allowed = reserve.purses_allowed + (in_default_purse_limit * my_years_tmp);
END IF;
-- Compute cost based on annual fees
IF (my_years > 0)
THEN
my_cost.val = my_years * in_open_fee.val;
my_cost_tmp = my_years * in_open_fee.frac / 100000000;
IF (CAST (my_cost.val + my_cost_tmp AS INT8) < my_cost.val)
THEN
out_open_cost.val=9223372036854775807;
out_open_cost.frac=2147483647;
out_final_expiration=my_expiration_date;
out_no_funds=FALSE;
RAISE NOTICE 'arithmetic issue computing amount';
RETURN;
END IF;
my_cost.val = CAST (my_cost.val + my_cost_tmp AS INT8);
my_cost.frac = my_years * in_open_fee.frac % 100000000;
my_needs_update = TRUE;
END IF;
-- check if we actually have something to do
IF NOT my_needs_update
THEN
out_final_expiration = reserve.expiration_date;
out_open_cost.val = 0;
out_open_cost.frac = 0;
out_no_funds=FALSE;
RAISE NOTICE 'no change required';
RETURN;
END IF;
-- Check payment (coins and reserve) would be sufficient.
IF ( (in_total_paid.val < my_cost.val) OR
( (in_total_paid.val = my_cost.val) AND
(in_total_paid.frac < my_cost.frac) ) )
THEN
out_open_cost.val = my_cost.val;
out_open_cost.frac = my_cost.frac;
out_no_funds=FALSE;
-- We must return a failure, which is indicated by
-- the expiration being below the desired expiration.
IF (reserve.expiration_date >= in_desired_expiration)
THEN
-- This case is relevant especially if the purse
-- count was to be increased and the payment was
-- insufficient to cover this for the full period.
RAISE NOTICE 'forcing low expiration time';
out_final_expiration = 0;
ELSE
out_final_expiration = reserve.expiration_date;
END IF;
RAISE NOTICE 'amount paid too low';
RETURN;
END IF;
-- Check reserve balance is sufficient.
IF (out_reserve_balance.val > in_reserve_payment.val)
THEN
IF (out_reserve_balance.frac >= in_reserve_payment.frac)
THEN
my_balance.val=out_reserve_balance.val - in_reserve_payment.val;
my_balance.frac=out_reserve_balance.frac - in_reserve_payment.frac;
ELSE
my_balance.val=out_reserve_balance.val - in_reserve_payment.val - 1;
my_balance.frac=out_reserve_balance.frac + 100000000 - in_reserve_payment.frac;
END IF;
ELSE
IF (out_reserve_balance.val = in_reserve_payment.val) AND (out_reserve_balance.frac >= in_reserve_payment.frac)
THEN
my_balance.val=0;
my_balance.frac=out_reserve_balance.frac - in_reserve_payment.frac;
ELSE
out_final_expiration = reserve.expiration_date;
out_open_cost.val = my_cost.val;
out_open_cost.frac = my_cost.frac;
out_no_funds=TRUE;
RAISE NOTICE 'reserve balance too low';
RETURN;
END IF;
END IF;
UPDATE reserves SET
current_balance=my_balance
,gc_date=reserve.expiration_date + in_reserve_gc_delay
,expiration_date=my_expiration_date
,purses_allowed=reserve.purses_allowed
WHERE
reserve_pub=in_reserve_pub;
out_final_expiration=my_expiration_date;
out_open_cost = my_cost;
out_no_funds=FALSE;
RETURN;
END $$;
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