/* @tier medium @module st @transform settlement-online */
/*
 * st_ol_0020.pgc - 정산 수수료 재계산 (ST_OL_0020)  [tier=medium]
 *
 * 원장 건을 조회하여 표준요율로 수수료를 재계산하고, 재계산 전/후
 * 수수료와 정산순액 변동분(delta)을 응답한다.
 */
#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_0020, ctx)
{
    st_rec_t rec;
    char key[16];
    long std_bp = 0, new_fee, delta, new_net;
    int  rc;

    tx_log(TX_LOG_INFO, "[ST_OL_0020] 정산 재계산 진입");

    if (tx_buf_get(ctx->in, "KEY", key, sizeof(key)) != TX_OK) {
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }
    tx_buf_getlong(ctx->in, "STDBP", &std_bp);
    if (std_bp <= 0) std_bp = 180;

    memset(&rec, 0, sizeof(rec));
    rc = st_rec_select(key, &rec);
    if (rc != TX_OK) {
        tx_return(ctx, rc, ctx->out);
        return;
    }

    new_fee = st_fee_round(rec.amount, std_bp);
    delta   = new_fee - rec.fee;
    new_net = rec.amount - new_fee;

    tx_buf_reset(ctx->out);
    tx_buf_sets(ctx->out, "RESPCODE", RESP_OK);
    tx_buf_sets(ctx->out, "KEY", key);
    tx_buf_setlong(ctx->out, "OLDFEE", rec.fee);
    tx_buf_setlong(ctx->out, "NEWFEE", new_fee);
    tx_buf_setlong(ctx->out, "DELTA", delta);
    tx_buf_setlong(ctx->out, "NEWNET", new_net);
    tx_log(TX_LOG_INFO, "[ST_OL_0020] 재계산 key=%s old=%ld new=%ld delta=%ld",
           key, rec.fee, new_fee, delta);
    tx_return(ctx, TX_OK, ctx->out);
}
