/* @tier medium @module st @transform settlement-online */
/*
 * st_ol_0029.pgc - 수수료 상/하한(cap/floor) 적용 (ST_OL_0029)  [tier=medium]
 *
 * 정률 수수료 산출 후 건별 최소수수료(floor)와 최대수수료(cap) 로
 * 클램핑하여 최종 수수료를 확정한다. floor/cap 미입력 시 가맹점 수수료
 * 한도 마스터(st_fee_bound)에서 조회한다.
 */
#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_0029, ctx)
{
    EXEC SQL BEGIN DECLARE SECTION;
    char h_merch[16];
    long h_floor;
    long h_cap;
    EXEC SQL END DECLARE SECTION;

    char merch[16];
    long amount = 0, bp = 0, floor = 0, cap = 0, raw, fee;
    const char *clamp;

    tx_log(TX_LOG_INFO, "[ST_OL_0029] 수수료 상/하한 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);
    tx_buf_getlong(ctx->in, "BP", &bp);
    tx_buf_getlong(ctx->in, "FLOOR", &floor);
    tx_buf_getlong(ctx->in, "CAP", &cap);
    if (bp <= 0) bp = 180;

    /* 수수료 한도 조회 */
    if (floor <= 0 || cap <= 0) {
        strncpy(h_merch, merch, sizeof(h_merch) - 1);
        h_merch[sizeof(h_merch) - 1] = '\0';
        h_floor = 0;
        h_cap = 0;
        EXEC SQL SELECT floor_fee, cap_fee
            INTO :h_floor, :h_cap
            FROM st_fee_bound
            WHERE merch_id = :h_merch;
        if (sqlca.sqlcode == TX_SQL_OK) {
            if (floor <= 0) floor = h_floor;
            if (cap <= 0)   cap   = h_cap;
        } else if (sqlca.sqlcode != TX_SQL_NOTFOUND) {
            TX_DBIO_LOG_ERR("SELECT st_fee_bound");
        }
    }
    if (floor <= 0) floor = 100;         /* 최소 100원 */
    if (cap <= 0) cap = 50000;           /* 최대 5만원 */

    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;
    }

    raw = st_fee_round(amount, bp);
    if (raw < floor)      { fee = floor; clamp = "FLOOR"; }
    else if (raw > cap)   { fee = cap;   clamp = "CAP"; }
    else                  { fee = raw;   clamp = "NONE"; }

    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, "RAWFEE", raw);
    tx_buf_setlong(ctx->out, "FLOOR", floor);
    tx_buf_setlong(ctx->out, "CAP", cap);
    tx_buf_setlong(ctx->out, "FEE", fee);
    tx_buf_sets(ctx->out, "CLAMP", clamp);
    tx_log(TX_LOG_INFO, "[ST_OL_0029] cap/floor raw=%ld fee=%ld clamp=%s",
           raw, fee, clamp);
    tx_return(ctx, TX_OK, ctx->out);
}