/* @tier medium @module py @transform payment-online */
/*
 * py_ol_0020.pgc - 지급 한도확인(가맹점 일지급 한도) (PY_OL_0020)  [tier=medium]
 *
 * TxCore TX_SERVICE 엔트리. 요청 TXBUF 를 검증하고 임베디드 SQL / 표준
 * DBIO / tx_call 로 처리한 뒤 응답 TXBUF 를 구성한다.
 */
#include <stdio.h>
#include <string.h>

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

EXEC SQL INCLUDE sqlca;

TX_SERVICE(PY_OL_0020, ctx)
{
    EXEC SQL BEGIN DECLARE SECTION;
    char h_merch[16], h_bdate[9];
    long h_paid, h_req;
    EXEC SQL END DECLARE SECTION;

    char merch[16], bdate[16];
    long req = 0, limit_amt = 500000000L;

    tx_log(TX_LOG_INFO, "[PY_OL_0020] 지급 한도확인 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, "BIZDATE", bdate, sizeof(bdate)) != TX_OK)
        date_today(bdate);
    tx_buf_getlong(ctx->in, "AMOUNT", &req);

    strncpy(h_merch, merch, 15); h_merch[15] = '\0';
    strncpy(h_bdate, bdate, 8);  h_bdate[8] = '\0';
    h_req = req;

    EXEC SQL SELECT coalesce(sum(amount), 0) INTO :h_paid
        FROM py_ledger
        WHERE merch_id = :h_merch AND biz_date = :h_bdate AND status IN ('M','S');
    if (sqlca.sqlcode != TX_SQL_OK) { TX_DBIO_LOG_ERR("py_ol_0020"); tx_return(ctx, TX_EDB, ctx->out); return; }

    tx_buf_reset(ctx->out);
    if (h_paid + h_req > limit_amt) {
        tx_buf_sets(ctx->out, "OVERLIMIT", "Y");
        tx_buf_sets(ctx->out, "RESPCODE", RESP_INVALID);
        tx_log(TX_LOG_WARN, "[PY_OL_0020] 지급한도 초과 paid=%ld req=%ld", h_paid, h_req);
        tx_return(ctx, TX_FAIL, ctx->out); return;
    }
    tx_buf_sets(ctx->out, "OVERLIMIT", "N");
    tx_buf_setlong(ctx->out, "AVAIL", limit_amt - h_paid);
    tx_log(TX_LOG_INFO, "[PY_OL_0020] 지급한도 avail=%ld", limit_amt - h_paid);
    tx_return(ctx, TX_OK, ctx->out);
}