/* @tier easy @module st @transform settlement-online */
/*
 * st_ol_0030.pgc - 정산 통화환산(원화) (ST_OL_0030)  [tier=easy]
 *
 * 외화 매출을 적용환율(1e4 스케일)로 원화 환산한다. 원화 환산액은
 * 원단위 미만을 절사하고, 수수료는 환산 후 원화 기준으로 산출한다.
 * 환율 미입력 시 통화별 고시환율(st_fx_rate)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_0030, ctx)
{
    EXEC SQL BEGIN DECLARE SECTION;
    char h_cur[4];
    long h_rate;
    EXEC SQL END DECLARE SECTION;

    char merch[16], cur[4];
    long fx_amount = 0, rate = 0, fee_bp = 0, krw, fee, net;

    tx_log(TX_LOG_INFO, "[ST_OL_0030] 정산 통화환산 진입");

    if (tx_buf_get(ctx->in, "MERCHID", merch, sizeof(merch)) != TX_OK) {
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }
    if (tx_buf_get(ctx->in, "CUR", cur, sizeof(cur)) != TX_OK)
        strncpy(cur, "USD", sizeof(cur) - 1);
    tx_buf_getlong(ctx->in, "FXAMT", &fx_amount);   /* 외화 최소단위 */
    tx_buf_getlong(ctx->in, "RATE", &rate);         /* 환율 x 10000 */
    tx_buf_getlong(ctx->in, "FEEBP", &fee_bp);
    if (fee_bp <= 0) fee_bp = 200;                  /* 2% */

    /* 고시환율 조회 (당일 최신 고시) */
    if (rate <= 0) {
        strncpy(h_cur, cur, sizeof(h_cur) - 1);
        h_cur[sizeof(h_cur) - 1] = '\0';
        h_rate = 0;
        EXEC SQL SELECT rate_x10000
            INTO :h_rate
            FROM st_fx_rate
            WHERE cur_code = :h_cur
            ORDER BY quote_ts DESC
            LIMIT 1;
        if (sqlca.sqlcode == TX_SQL_OK && h_rate > 0)
            rate = h_rate;
        else if (sqlca.sqlcode != TX_SQL_OK && sqlca.sqlcode != TX_SQL_NOTFOUND)
            TX_DBIO_LOG_ERR("SELECT st_fx_rate");
    }

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

    krw = fx_amount * rate / 10000;     /* 원단위 미만 절사 */
    fee = st_fee_round(krw, fee_bp);
    net = krw - fee;

    tx_buf_reset(ctx->out);
    tx_buf_sets(ctx->out, "RESPCODE", RESP_OK);
    tx_buf_sets(ctx->out, "MERCHID", merch);
    tx_buf_sets(ctx->out, "CUR", cur);
    tx_buf_setlong(ctx->out, "RATE", rate);
    tx_buf_setlong(ctx->out, "KRW", krw);
    tx_buf_setlong(ctx->out, "FEE", fee);
    tx_buf_setlong(ctx->out, "NET", net);
    tx_log(TX_LOG_INFO, "[ST_OL_0030] 환산 %s fx=%ld rate=%ld krw=%ld net=%ld",
           cur, fx_amount, rate, krw, net);
    tx_return(ctx, TX_OK, ctx->out);
}