/* @tier easy @module ac @transform acquire-online */
/*
 * ac_ol_0030.pgc - 매입 온라인 서비스 (AC_OL_0030)  [tier=easy]
 *
 * 매입 중복해제: 동일 가맹점/카드번호/금액/영업일 조합으로 중복 접수된
 * ac_ledger 건 중 최초 건(최소 key)만 유효로 남기고 나머지는 중복
 * 무효(status='U') 처리한다.
 */
#include <stdio.h>
#include <string.h>

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

EXEC SQL INCLUDE sqlca;

TX_SERVICE(AC_OL_0030, ctx)
{
    /* ---- ECPG 호스트 변수 선언부 ---- */
    EXEC SQL BEGIN DECLARE SECTION;
    char h_merch_id[16];
    char h_card_no[20];
    long h_amount;
    char h_biz_date[9];
    char h_status_fail[2];
    long h_dupcnt;
    EXEC SQL END DECLARE SECTION;

    char merch[16], cardno[20], bizdate[9];
    long amount = 0;
    long voided = 0;

    tx_log(TX_LOG_INFO, "[AC_OL_0030] 매입 중복해제 서비스 진입");

    /* ---- 1. 입력 검증 ---- */
    if (tx_buf_get(ctx->in, "MERCHID", merch, sizeof(merch)) != TX_OK ||
        tx_buf_get(ctx->in, "CARDNO", cardno, sizeof(cardno)) != TX_OK ||
        tx_buf_get(ctx->in, "BIZDATE", bizdate, sizeof(bizdate)) != TX_OK) {
        tx_log(TX_LOG_ERROR, "[AC_OL_0030] 필수 필드 누락");
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_INVALID);
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }
    tx_buf_getlong(ctx->in, "AMOUNT", &amount);

    if (!amount_is_valid(amount) || !date_is_valid(bizdate)) {
        tx_log(TX_LOG_WARN, "[AC_OL_0030] 입력 검증 실패 amount=%ld date=%s",
               amount, bizdate);
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_INVALID);
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }

    memset(h_merch_id, 0, sizeof(h_merch_id));
    strncpy(h_merch_id, merch, sizeof(h_merch_id) - 1);
    memset(h_card_no, 0, sizeof(h_card_no));
    strncpy(h_card_no, cardno, sizeof(h_card_no) - 1);
    memset(h_biz_date, 0, sizeof(h_biz_date));
    strncpy(h_biz_date, bizdate, sizeof(h_biz_date) - 1);
    h_amount = amount;
    strncpy(h_status_fail, AC_ST_FAIL, sizeof(h_status_fail) - 1);
    h_status_fail[sizeof(h_status_fail) - 1] = '\0';

    /* ---- 2. 중복 집합 크기 사전 확인 ---- */
    EXEC SQL SELECT COUNT(*)
          INTO :h_dupcnt
          FROM ac_ledger
         WHERE merch_id = :h_merch_id
           AND card_no  = :h_card_no
           AND amount   = :h_amount
           AND biz_date = :h_biz_date;

    if (sqlca.sqlcode != TX_SQL_OK && sqlca.sqlcode != TX_SQL_NOTFOUND) {
        TX_DBIO_LOG_ERR("SELECT ac_ledger 중복집합 확인");
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_SYSERR);
        tx_return(ctx, TX_EDB, ctx->out);
        return;
    }
    if (h_dupcnt <= 1) {
        tx_log(TX_LOG_INFO, "[AC_OL_0030] 중복건 없음 merch=%s card=%s", merch, cardno);
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_OK);
        tx_buf_sets(ctx->out, "MERCHID", merch);
        tx_buf_setlong(ctx->out, "VOIDED", 0);
        tx_return(ctx, TX_OK, ctx->out);
        return;
    }

    /* ---- 3. 트랜잭션: 최초 건(최소 key) 제외 나머지 무효화 ---- */
    if (tx_begin() != TX_OK) {
        tx_log(TX_LOG_ERROR, "[AC_OL_0030] 트랜잭션 시작 실패");
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_SYSERR);
        tx_return(ctx, TX_FAIL, ctx->out);
        return;
    }

    EXEC SQL UPDATE ac_ledger
           SET status = :h_status_fail, upd_ts = now()
         WHERE merch_id = :h_merch_id
           AND card_no  = :h_card_no
           AND amount   = :h_amount
           AND biz_date = :h_biz_date
           AND key <> (
                SELECT MIN(key)
                  FROM ac_ledger
                 WHERE merch_id = :h_merch_id
                   AND card_no  = :h_card_no
                   AND amount   = :h_amount
                   AND biz_date = :h_biz_date
           );

    if (sqlca.sqlcode != TX_SQL_OK) {
        TX_DBIO_LOG_ERR("UPDATE ac_ledger 중복무효");
        tx_abort();
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_SYSERR);
        tx_return(ctx, TX_EDB, ctx->out);
        return;
    }
    voided = sqlca.sqlerrd[2];

    if (tx_commit() != TX_OK) {
        tx_log(TX_LOG_ERROR, "[AC_OL_0030] 커밋 실패");
        tx_abort();
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_SYSERR);
        tx_return(ctx, TX_FAIL, ctx->out);
        return;
    }

    /* ---- 4. 응답 구성 ---- */
    tx_buf_reset(ctx->out);
    tx_buf_sets(ctx->out, "RESPCODE", RESP_OK);
    tx_buf_sets(ctx->out, "MERCHID", merch);
    tx_buf_setlong(ctx->out, "VOIDED", voided);

    tx_log(TX_LOG_INFO,
           "[AC_OL_0030] 중복해제완료 merch=%s card=%s 무효건수=%ld",
           merch, cardno, voided);
    tx_return(ctx, TX_OK, ctx->out);
}