/* @tier medium @module cm @transform common-online */
/*
 * cm_ol_0006.pgc - 순번 채번 서비스 (CM_OL_0006)  [tier=medium]
 *
 * 요청의 채번키(SEQKEY)로 공통 순번 마스터(cm_seq)를 UPDATE 로 1
 * 증가시킨 뒤 증가된 순번을 SELECT 하여 발급한다. 채번은 트랜잭션
 * 경계 안에서 원자적으로 수행한다(tx_begin/commit). 순환최대치를
 * 넘으면 1 로 리셋한다.
 * (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_0006, ctx)
{
    EXEC SQL BEGIN DECLARE SECTION;
    char h_seqkey[16];
    char h_prefix[8];
    long h_seqval;
    long h_maxval;
    int  h_width;
    EXEC SQL END DECLARE SECTION;

    char seqkey[16];
    char issued[32];

    tx_log(TX_LOG_INFO, "[CM_OL_0006] 순번 채번 서비스 진입");

    memset(seqkey, 0, sizeof(seqkey));
    memset(issued, 0, sizeof(issued));

    if (tx_buf_get(ctx->in, "SEQKEY", seqkey, sizeof(seqkey)) != TX_OK) {
        tx_log(TX_LOG_ERROR, "[CM_OL_0006] 채번키(SEQKEY) 누락");
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }

    if (tx_begin() != TX_OK) {
        tx_log(TX_LOG_ERROR, "[CM_OL_0006] 트랜잭션 시작 실패");
        tx_return(ctx, TX_FAIL, ctx->out);
        return;
    }

    memset(h_seqkey, 0, sizeof(h_seqkey));
    memset(h_prefix, 0, sizeof(h_prefix));
    strncpy(h_seqkey, seqkey, sizeof(h_seqkey) - 1);
    h_seqval = 0;
    h_maxval = 0;
    h_width  = 0;

    /* 순환최대치/자리수/접두어 확보 (행잠금) */
    EXEC SQL SELECT cur_val, max_val, seq_width, prefix
          INTO :h_seqval, :h_maxval, :h_width, :h_prefix
          FROM cm_seq
         WHERE seq_key = :h_seqkey
           FOR UPDATE;

    if (sqlca.sqlcode == TX_SQL_NOTFOUND) {
        tx_log(TX_LOG_WARN, "[CM_OL_0006] 채번키 미등록 seqkey=%s", seqkey);
        tx_abort();
        tx_return(ctx, TX_ENOKEY, ctx->out);
        return;
    }
    if (sqlca.sqlcode != TX_SQL_OK) {
        TX_DBIO_LOG_ERR("CM_OL_0006 SELECT cm_seq");
        tx_abort();
        tx_return(ctx, TX_EDB, ctx->out);
        return;
    }

    /* 다음 순번 산출 (순환) */
    h_seqval = h_seqval + 1;
    if (h_maxval > 0 && h_seqval > h_maxval) {
        h_seqval = 1;
        tx_log(TX_LOG_INFO, "[CM_OL_0006] 순번 순환 리셋 seqkey=%s", seqkey);
    }

    EXEC SQL UPDATE cm_seq
           SET cur_val = :h_seqval,
               upd_ts  = CURRENT_TIMESTAMP
         WHERE seq_key = :h_seqkey;

    if (sqlca.sqlcode != TX_SQL_OK) {
        TX_DBIO_LOG_ERR("CM_OL_0006 UPDATE cm_seq");
        tx_abort();
        tx_return(ctx, TX_EDB, ctx->out);
        return;
    }

    tx_commit();

    /* 접두어 + 자리수 zero-padding 으로 발급번호 조립 */
    if (h_width <= 0 || h_width > 18) {
        h_width = 10;
    }
    snprintf(issued, sizeof(issued), "%s%0*ld", h_prefix, h_width, h_seqval);

    tx_buf_reset(ctx->out);
    tx_buf_sets(ctx->out, "SEQKEY", seqkey);
    tx_buf_setlong(ctx->out, "SEQVAL", h_seqval);
    tx_buf_sets(ctx->out, "ISSUEDNO", issued);

    tx_log(TX_LOG_INFO, "[CM_OL_0006] 채번완료 seqkey=%s no=%s", seqkey, issued);
    tx_return(ctx, TX_OK, ctx->out);
}