--
-- This file is part of TALER
-- Copyright (C) 2024 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 merchant_do_insert_transfer_details (
  IN in_instance_id TEXT,
  IN in_exchange_url TEXT,
  IN in_payto_uri TEXT,
  IN in_wtid BYTEA,
  IN in_execution_time INT8,
  IN in_exchange_pub BYTEA,
  IN in_exchange_sig BYTEA,
  IN in_total_amount taler_amount_currency,
  IN in_wire_fee taler_amount_currency,
  IN ina_coin_values taler_amount_currency[],
  IN ina_deposit_fees taler_amount_currency[],
  IN ina_coin_pubs BYTEA[],
  IN ina_contract_terms BYTEA[],
  OUT out_no_instance BOOL,
  OUT out_no_account BOOL,
  OUT out_no_exchange BOOL,
  OUT out_duplicate BOOL,
  OUT out_conflict BOOL)
LANGUAGE plpgsql
AS $$
DECLARE
  my_merchant_id INT8;
  my_signkey_serial INT8;
  my_credit_serial INT8;
  my_affected_orders RECORD;
  i INT8;
  curs CURSOR (arg_coin_pub BYTEA) FOR
    SELECT mcon.deposit_confirmation_serial,
           mcon.order_serial
      FROM merchant_deposits dep
      JOIN merchant_deposit_confirmations mcon
        USING (deposit_confirmation_serial)
      WHERE dep.coin_pub=arg_coin_pub;
  ini_coin_pub BYTEA;
  ini_contract_term BYTEA;
  ini_coin_value taler_amount_currency;
  ini_deposit_fee taler_amount_currency;
BEGIN

-- Which instance are we using?
SELECT merchant_serial
  INTO my_merchant_id
  FROM merchant_instances
 WHERE merchant_id=in_instance_id;

IF NOT FOUND
THEN
  out_no_instance=TRUE;
  out_no_account=FALSE;
  out_no_exchange=FALSE;
  out_duplicate=FALSE;
  out_conflict=FALSE;
  RETURN;
END IF;
out_no_instance=FALSE;

-- Determine account that was credited.
SELECT credit_serial
  INTO my_credit_serial
  FROM merchant_transfers
 WHERE exchange_url=in_exchange_url
     AND wtid=in_wtid
     AND account_serial=
     (SELECT account_serial
        FROM merchant_accounts
       WHERE payto_uri=in_payto_uri
         AND exchange_url=in_exchange_url
         AND merchant_serial=my_merchant_id);

IF NOT FOUND
THEN
  out_no_account=TRUE;
  out_no_exchange=FALSE;
  out_duplicate=FALSE;
  out_conflict=FALSE;
  RETURN;
END IF;
out_no_account=FALSE;

-- Find exchange sign key
SELECT signkey_serial
  INTO my_signkey_serial
  FROM merchant_exchange_signing_keys
 WHERE exchange_pub=in_exchange_pub
   ORDER BY start_date DESC
   LIMIT 1;

IF NOT FOUND
THEN
  out_no_exchange=TRUE;
  out_conflict=FALSE;
  out_duplicate=FALSE;
  RETURN;
END IF;
out_no_exchange=FALSE;

-- Add signature first, check for idempotent request
INSERT INTO merchant_transfer_signatures
  (credit_serial
  ,signkey_serial
  ,credit_amount
  ,wire_fee
  ,execution_time
  ,exchange_sig)
  VALUES
   (my_credit_serial
   ,my_signkey_serial
   ,in_total_amount
   ,in_wire_fee
   ,in_execution_time
   ,in_exchange_sig)
  ON CONFLICT DO NOTHING;

IF NOT FOUND
THEN
  PERFORM 1
    FROM merchant_transfer_signatures
    WHERE credit_serial=my_credit_serial
      AND signkey_serial=my_signkey_serial
      AND credit_amount=in_credit_amount
      AND wire_fee=in_wire_fee
      AND execution_time=in_execution_time
      AND exchange_sig=in_exchange_sig;
  IF FOUND
  THEN
    -- duplicate case
    out_duplicate=TRUE;
    out_conflict=FALSE;
    RETURN;
  END IF;
  -- conflict case
  out_duplicate=FALSE;
  out_conflict=TRUE;
  RETURN;
END IF;

out_duplicate=FALSE;
out_conflict=FALSE;


FOR i IN 1..array_length(ina_coin_pubs,1)
LOOP
  ini_coin_value=ina_coin_values[i];
  ini_deposit_fee=ina_deposit_fees[i];
  ini_coin_pub=ina_coin_pubs[i];
  ini_contract_term=ina_contract_terms[i];

  INSERT INTO merchant_transfer_to_coin
    (deposit_serial
    ,credit_serial
    ,offset_in_exchange_list
    ,exchange_deposit_value
    ,exchange_deposit_fee)
    SELECT
        dep.deposit_serial
       ,my_credit_serial
       ,i
       ,ini_coin_value
       ,ini_deposit_fee
      FROM merchant_deposits dep
      JOIN merchant_deposit_confirmations dcon
        USING (deposit_confirmation_serial)
      JOIN merchant_contract_terms cterm
        USING (order_serial)
      WHERE dep.coin_pub=ini_coin_pub
        AND cterm.h_contract_terms=ini_contract_term
        AND cterm.merchant_serial=my_merchant_id;

  RAISE NOTICE 'iterating over affected orders';
  OPEN curs (arg_coin_pub:=ini_coin_pub);
  LOOP
    FETCH NEXT FROM curs INTO my_affected_orders;
    EXIT WHEN NOT FOUND;

    RAISE NOTICE 'checking affected order for completion';

    -- First, check if deposit confirmation is done.
    UPDATE merchant_deposit_confirmations
       SET wire_pending=FALSE
     WHERE (deposit_confirmation_serial=my_affected_orders.deposit_confirmation_serial)
       AND NOT EXISTS
       (SELECT 1
          FROM merchant_deposits md
          LEFT JOIN merchant_deposit_to_transfer mdtt
            USING (deposit_serial)
          WHERE md.deposit_confirmation_serial=my_affected_orders.deposit_confirmation_serial
            AND mdtt.wtid IS NULL);
    -- wtid will be NULL due to LEFT JOIN
    -- if we do not have an entry in mdtt for the deposit
    -- and thus some entry in md was not yet wired.

    IF FOUND
    THEN
      -- Also update contract terms, if all (other) associated
      -- deposit_confirmations are also done.

      UPDATE merchant_contract_terms
         SET wired=TRUE
       WHERE (order_serial=my_affected_orders.order_serial)
         AND NOT EXISTS
         (SELECT 1
            FROM merchant_deposit_confirmations mdc
             WHERE mdc.wire_pending
               AND mdc.order_serial=my_affected_orders.order_serial);
    END IF;

  END LOOP; -- END curs LOOP
  CLOSE curs;
END LOOP; -- END FOR loop

END $$;