/* @tier easy @module st @transform settlement-online */
/*
 * st_ol_0016.pgc - 카드사(발급사) 정산 계산 (ST_OL_0016)  [tier=easy]
 *
 * 발급 카드사로부터 수취할 정산금 = 매출총액 - 정산수수료(인터체인지).
 * 인터체인지 요율(만분율)을 적용해 발급사 정산순액을 산출한다. 요율
 * 미입력 시 발급사 인터체인지 마스터(st_interchange)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_0016, ctx)
{
    EXEC SQL BEGIN DECLARE SECTION;
    char h_issuer[12];
    long h_ic_bp;
    EXEC SQL END DECLARE SECTION;

    char issuer[12];
    long gross = 0, ic_bp = 0, ic_fee, net;
    const char *rate_src = "INPUT";

    tx_log(TX_LOG_INFO, "[ST_OL_0016] 카드사 정산 계산 진입");

    if (tx_buf_get(ctx->in, "ISSUER", issuer, sizeof(issuer)) != TX_OK) {
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }
    tx_buf_getlong(ctx->in, "GROSS", &gross);
    tx_buf_getlong(ctx->in, "ICBP",  &ic_bp);

    /* 인터체인지 요율 조회 */
    if (ic_bp <= 0) {
        strncpy(h_issuer, issuer, sizeof(h_issuer) - 1);
        h_issuer[sizeof(h_issuer) - 1] = '\0';
        h_ic_bp = 0;
        EXEC SQL SELECT interchange_bp
            INTO :h_ic_bp
            FROM st_interchange
            WHERE issuer_code = :h_issuer;
        if (sqlca.sqlcode == TX_SQL_OK && h_ic_bp > 0) {
            ic_bp    = h_ic_bp;
            rate_src = "MASTER";
        } else if (sqlca.sqlcode == TX_SQL_NOTFOUND) {
            rate_src = "DEFAULT";
        } else if (sqlca.sqlcode != TX_SQL_OK) {
            TX_DBIO_LOG_ERR("SELECT st_interchange");
        }
    }
    if (ic_bp <= 0 || ic_bp > 10000) ic_bp = 120;   /* 인터체인지 1.2% */

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

    ic_fee = st_fee_round(gross, ic_bp);
    net    = gross - ic_fee;

    tx_buf_reset(ctx->out);
    tx_buf_sets(ctx->out, "RESPCODE", RESP_OK);
    tx_buf_sets(ctx->out, "ISSUER", issuer);
    tx_buf_sets(ctx->out, "RATESRC", rate_src);
    tx_buf_setlong(ctx->out, "GROSS", gross);
    tx_buf_setlong(ctx->out, "ICBP", ic_bp);
    tx_buf_setlong(ctx->out, "ICFEE", ic_fee);
    tx_buf_setlong(ctx->out, "NET", net);
    tx_log(TX_LOG_INFO, "[ST_OL_0016] 카드사 정산 issuer=%s gross=%ld fee=%ld net=%ld",
           issuer, gross, ic_fee, net);
    tx_return(ctx, TX_OK, ctx->out);
}