/* @tier easy @module st @transform settlement-online */
/*
 * st_ol_0005.pgc - 중계 수수료 계산 (ST_OL_0005)  [tier=easy]
 *
 * 결제 중계사(PG/중계) 수수료 = 정률(만분율) + 건당 정액 합산 모델.
 * 정률분과 정액분을 각각 산출하여 합산한다.
 */
#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_0005, ctx)
{
    char merch[16];
    long amount = 0, rate_bp = 0, txn_cnt = 0, flat = 0;
    long rate_part, flat_part, relay_fee, net;

    tx_log(TX_LOG_INFO, "[ST_OL_0005] 중계 수수료 계산 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);
    tx_buf_getlong(ctx->in, "RATEBP", &rate_bp);
    tx_buf_getlong(ctx->in, "TXNCNT", &txn_cnt);
    if (tx_buf_getlong(ctx->in, "FLATFEE", &flat) != TX_OK || flat < 0)
        flat = 30;                      /* 중계 건당 기본 30원 */
    if (txn_cnt <= 0) txn_cnt = 1;

    if (!amount_is_valid(amount) || rate_bp < 0 || rate_bp > 10000) {
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_INVALID);
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }

    rate_part = st_fee_round(amount, rate_bp);
    flat_part = flat * txn_cnt;
    relay_fee = rate_part + flat_part;
    net       = amount - relay_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, "RATEPART", rate_part);
    tx_buf_setlong(ctx->out, "FLATPART", flat_part);
    tx_buf_setlong(ctx->out, "RELAYFEE", relay_fee);
    tx_buf_setlong(ctx->out, "NET", net);
    tx_log(TX_LOG_INFO, "[ST_OL_0005] 중계수수료 정률=%ld 정액=%ld 합=%ld",
           rate_part, flat_part, relay_fee);
    tx_return(ctx, TX_OK, ctx->out);
}
