/* @tier medium @module au @transform authorization-online */
/*
 * au_ol_0021.pgc - 가맹점별 한도잔여 조회(승인율 포함) (AU_OL_0021)  [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_0021, ctx)
{
    EXEC SQL BEGIN DECLARE SECTION;
    char h_merch[16];
    long h_used;
    int  h_total, h_appr;
    EXEC SQL END DECLARE SECTION;

    char merch[16];
    long limit_amt = 200000000L;
    int  ratio = 0;

    tx_log(TX_LOG_INFO, "[AU_OL_0021] 가맹점 한도잔여 조회 진입");
    if (tx_buf_get(ctx->in, "MERCHID", merch, sizeof(merch)) != TX_OK) {
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }
    strncpy(h_merch, merch, 15); h_merch[15] = '\0';

    EXEC SQL SELECT coalesce(sum(amount), 0),
                    count(*),
                    count(*) FILTER (WHERE status IN ('M','S'))
        INTO :h_used, :h_total, :h_appr
        FROM au_ledger WHERE merch_id = :h_merch;
    if (sqlca.sqlcode != TX_SQL_OK) {
        TX_DBIO_LOG_ERR("au_ol_0021 잔여조회");
        tx_return(ctx, TX_EDB, ctx->out);
        return;
    }
    if (h_total > 0) ratio = h_appr * 100 / h_total;

    tx_buf_reset(ctx->out);
    tx_buf_sets(ctx->out, "MERCHID", merch);
    tx_buf_setlong(ctx->out, "REMAIN", (limit_amt > h_used) ? limit_amt - h_used : 0);
    tx_buf_setlong(ctx->out, "APPRRATE", ratio);
    tx_log(TX_LOG_INFO, "[AU_OL_0021] merch=%s used=%ld 승인율=%d%%", merch, h_used, ratio);
    tx_return(ctx, TX_OK, ctx->out);
}