/* @tier easy @module st @transform settlement-online */
/*
 * st_ol_0032.pgc - 정산 예치금(보증금) 산정 (ST_OL_0032)  [tier=easy]
 *
 * 정산순액의 일부를 지급유보(리스크 예치금)로 적립한다. 예치요율
 * (만분율)을 적용하여 예치금과 실지급액을 산출하고, 예치금 원장
 * (st_reserve_book)에 적립 내역을 기표한다.
 */
#include <stdio.h>
#include <string.h>

#include "txcore.h"
#include "txcore_dbio.h"
#include "acq_util.h"
#include "st_core.h"

EXEC SQL INCLUDE sqlca;


static long st_fee_round(long amount, long rate_bp)
{
    /* 요율(만분율, basis point) x 금액 -> 원단위 반올림 (BigDecimal HALF_UP 대응) */
    if (amount < 0)
        return -(((-amount) * rate_bp + 5000) / 10000);
    return (amount * rate_bp + 5000) / 10000;
}

TX_SERVICE(ST_OL_0032, ctx)
{
    EXEC SQL BEGIN DECLARE SECTION;
    char h_merch[16];
    long h_reserve_bp;
    long h_reserve;
    long h_balance;
    EXEC SQL END DECLARE SECTION;

    char merch[16];
    long net = 0, reserve_bp = 0, reserve, payout, balance = 0;

    tx_log(TX_LOG_INFO, "[ST_OL_0032] 정산 예치금 산정 진입");

    if (tx_buf_get(ctx->in, "MERCHID", merch, sizeof(merch)) != TX_OK) {
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }
    tx_buf_getlong(ctx->in, "NET", &net);
    tx_buf_getlong(ctx->in, "RESERVEBP", &reserve_bp);

    strncpy(h_merch, merch, sizeof(h_merch) - 1);
    h_merch[sizeof(h_merch) - 1] = '\0';

    /* 예치요율 정책 조회 */
    if (reserve_bp <= 0) {
        h_reserve_bp = 0;
        EXEC SQL SELECT reserve_bp
            INTO :h_reserve_bp
            FROM st_reserve_policy
            WHERE merch_id = :h_merch;
        if (sqlca.sqlcode == TX_SQL_OK && h_reserve_bp >= 0)
            reserve_bp = h_reserve_bp;
        else if (sqlca.sqlcode != TX_SQL_OK && sqlca.sqlcode != TX_SQL_NOTFOUND)
            TX_DBIO_LOG_ERR("SELECT st_reserve_policy");
    }
    if (reserve_bp <= 0 || reserve_bp > 10000) reserve_bp = 500;  /* 5% 예치 */

    if (net <= 0) {
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_INVALID);
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }

    reserve = st_fee_round(net, reserve_bp);
    payout  = net - reserve;

    /* 예치금 원장 적립 (트랜잭션 경계) */
    h_reserve = reserve;
    if (tx_begin() != TX_OK)
        tx_log(TX_LOG_WARN, "[ST_OL_0032] tx_begin 경고");

    EXEC SQL INSERT INTO st_reserve_book
            (merch_id, reserve_amt, reg_ts)
        VALUES
            (:h_merch, :h_reserve, now());
    if (sqlca.sqlcode != TX_SQL_OK) {
        TX_DBIO_LOG_ERR("INSERT st_reserve_book");
        tx_abort();
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_SYSERR);
        tx_return(ctx, TX_EDB, ctx->out);
        return;
    }
    tx_commit();

    /* 누적 예치잔액 재집계 */
    h_balance = 0;
    EXEC SQL SELECT coalesce(sum(reserve_amt), 0)
        INTO :h_balance
        FROM st_reserve_book
        WHERE merch_id = :h_merch;
    if (sqlca.sqlcode == TX_SQL_OK)
        balance = h_balance;

    tx_buf_reset(ctx->out);
    tx_buf_sets(ctx->out, "RESPCODE", RESP_OK);
    tx_buf_sets(ctx->out, "MERCHID", merch);
    tx_buf_setlong(ctx->out, "NET", net);
    tx_buf_setlong(ctx->out, "RESERVE", reserve);
    tx_buf_setlong(ctx->out, "PAYOUT", payout);
    tx_buf_setlong(ctx->out, "BALANCE", balance);
    tx_log(TX_LOG_INFO, "[ST_OL_0032] 예치금 net=%ld reserve=%ld payout=%ld 잔액=%ld",
           net, reserve, payout, balance);
    tx_return(ctx, TX_OK, ctx->out);
}
