/* @tier medium @module cm @transform common-online */
/*
 * cm_ol_0021.pgc - 통화 환산 서비스 (CM_OL_0021)  [tier=medium]
 *
 * 요청의 원화금액(AMOUNT)/통화코드(CUR)로 환율 마스터(cm_rate)를 조회하여
 * 외화 환산액을 정수 스케일 연산으로 산출해 응답한다. 환율은 스케일드
 * 정수(rate/rate_scale)로 보관되며 반올림 처리한다. 대외정산 환산 공통 서비스.
 * (ATMI void SVC(TPSVCINFO*) 대응)
 */
#include <stdio.h>
#include <string.h>

#include "txcore.h"
#include "txcore_dbio.h"
#include "acq_util.h"
#include "cm_core.h"

EXEC SQL INCLUDE sqlca;

TX_SERVICE(CM_OL_0021, ctx)
{
    EXEC SQL BEGIN DECLARE SECTION;
    char h_cur[8];
    char h_base[8];
    long h_rate;
    long h_scale;
    EXEC SQL END DECLARE SECTION;

    char cur[8];
    char rate_disp[24];
    long amount = 0;
    long converted;
    long numer;

    tx_log(TX_LOG_INFO, "[CM_OL_0021] 통화 환산 서비스 진입");

    if (tx_buf_get(ctx->in, "CUR", cur, sizeof(cur)) != TX_OK) {
        tx_log(TX_LOG_ERROR, "[CM_OL_0021] CUR 누락");
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }
    if (tx_buf_getlong(ctx->in, "AMOUNT", &amount) != TX_OK) {
        tx_log(TX_LOG_ERROR, "[CM_OL_0021] AMOUNT 누락");
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }
    if (!amount_is_valid(amount)) {
        tx_log(TX_LOG_WARN, "[CM_OL_0021] 금액 범위 오류 amount=%ld", amount);
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }

    memset(h_cur,  0, sizeof(h_cur));
    memset(h_base, 0, sizeof(h_base));
    strncpy(h_cur, cur, sizeof(h_cur) - 1);
    h_rate  = 0;
    h_scale = 0;

    EXEC SQL SELECT rate, rate_scale, base_cd
          INTO :h_rate, :h_scale, :h_base
          FROM cm_rate
         WHERE cur_cd = :h_cur
           AND use_yn = 'Y';

    if (sqlca.sqlcode == TX_SQL_NOTFOUND) {
        tx_log(TX_LOG_WARN, "[CM_OL_0021] 환율 없음 cur=%s", cur);
        tx_return(ctx, TX_ENOENT, ctx->out);
        return;
    }
    if (sqlca.sqlcode != TX_SQL_OK) {
        TX_DBIO_LOG_ERR("CM_OL_0021 SELECT cm_rate");
        tx_return(ctx, TX_EDB, ctx->out);
        return;
    }
    if (h_rate <= 0 || h_scale <= 0) {
        tx_log(TX_LOG_ERROR, "[CM_OL_0021] 환율 데이터 오류 rate=%ld scale=%ld",
               h_rate, h_scale);
        tx_return(ctx, TX_FAIL, ctx->out);
        return;
    }

    /* 외화 = 원화 * scale / rate (반올림). rate 는 base 1단위당 원화가격. */
    numer     = amount * h_scale;
    converted = (numer + (h_rate / 2)) / h_rate;

    /* 적용환율 표시: rate/scale 를 소수로 재구성 */
    snprintf(rate_disp, sizeof(rate_disp), "%ld.%0*ld",
             h_rate / h_scale, 2, (h_rate % h_scale) * 100 / h_scale);

    tx_buf_reset(ctx->out);
    tx_buf_sets(ctx->out, "CUR", cur);
    tx_buf_sets(ctx->out, "BASE", h_base);
    tx_buf_setlong(ctx->out, "AMOUNT", amount);
    tx_buf_setlong(ctx->out, "CONVERTED", converted);
    tx_buf_setlong(ctx->out, "RATE", h_rate);
    tx_buf_setlong(ctx->out, "SCALE", h_scale);
    tx_buf_sets(ctx->out, "RATEDISP", rate_disp);
    tx_log(TX_LOG_INFO, "[CM_OL_0021] 환산완료 %ld원 -> %s %ld (rate=%s)",
           amount, cur, converted, rate_disp);
    tx_return(ctx, TX_OK, ctx->out);
}
