/* @tier easy @module st @transform settlement-online */
/*
 * st_ol_0017.pgc - 구간요율 수수료율 적용 (ST_OL_0017)  [tier=easy]
 *
 * 거래금액 구간(band)별 차등 수수료율(만분율)을 적용하여 수수료를
 * 산출한다. 소액/중액/고액 3구간 슬라브 요율 모델.
 */
#include <stdio.h>
#include <string.h>

#include "txcore.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_0017, ctx)
{
    char merch[16];
    long amount = 0, bp, fee, net;

    tx_log(TX_LOG_INFO, "[ST_OL_0017] 구간요율 적용 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, "AMOUNT", &amount);
    if (!amount_is_valid(amount)) {
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_INVALID);
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }

    if (amount < 50000L)
        bp = 250;                       /* 5만원 미만 2.50% */
    else if (amount < 500000L)
        bp = 180;                       /* 50만원 미만 1.80% */
    else
        bp = 140;                       /* 그 이상 1.40% */

    fee = st_fee_round(amount, bp);
    net = amount - fee;

    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, "AMOUNT", amount);
    tx_buf_setlong(ctx->out, "BPUSED", bp);
    tx_buf_setlong(ctx->out, "FEE", fee);
    tx_buf_setlong(ctx->out, "NET", net);
    tx_log(TX_LOG_INFO, "[ST_OL_0017] 구간요율 amount=%ld bp=%ld fee=%ld",
           amount, bp, fee);
    tx_return(ctx, TX_OK, ctx->out);
}
