/* @tier medium @module au @transform authorization-online */
/*
 * au_ol_0003.pgc - 가맹점 한도 조회(잔여한도 산출) (AU_OL_0003)  [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 "au_core.h"

EXEC SQL INCLUDE sqlca;

TX_SERVICE(AU_OL_0003, ctx)
{
    char key[16];
    if (tx_buf_get(ctx->in, "KEY", key, sizeof(key)) != TX_OK) {
        tx_log(TX_LOG_ERROR, "[AU_OL_0003] KEY 누락");
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }
    EXEC SQL BEGIN DECLARE SECTION;
    char h_merch[16], h_bdate[9];
    long h_used;
    EXEC SQL END DECLARE SECTION;

    char merch[16], bdate[16];
    long limit_amt = 50000000L, remain;

    tx_log(TX_LOG_INFO, "[AU_OL_0003] 가맹점 한도조회 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);

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

    EXEC SQL SELECT coalesce(sum(amount), 0) INTO :h_used
        FROM au_ledger
        WHERE merch_id = :h_merch AND biz_date = :h_bdate
          AND status IN ('R', 'M', 'S');
    if (sqlca.sqlcode != TX_SQL_OK) {
        TX_DBIO_LOG_ERR("au_ol_0003 한도조회");
        tx_return(ctx, TX_EDB, ctx->out);
        return;
    }

    remain = limit_amt - h_used;
    if (remain < 0) remain = 0;

    tx_buf_reset(ctx->out);
    tx_buf_sets(ctx->out, "MERCHID", merch);
    tx_buf_setlong(ctx->out, "LIMIT", limit_amt);
    tx_buf_setlong(ctx->out, "USED", h_used);
    tx_buf_setlong(ctx->out, "REMAIN", remain);
    tx_log(TX_LOG_INFO, "[AU_OL_0003] 한도 used=%ld remain=%ld", h_used, remain);
    tx_return(ctx, TX_OK, ctx->out);
}