/* @tier easy @module mm @transform master-online */
/*
 * mm_ol_0023.pgc - 한도 이력조회 서비스 (MM_OL_0023)  [tier=easy]
 *
 * 가맹점의 한도변경 이력(mm_limit_hist) 중 가장 최근 1건을 조회하여
 * 이전한도/신규한도/변경일/변경자를 응답한다. 조회 전용(읽기) 서비스.
 * (마스터 이력 참조)
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

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

EXEC SQL INCLUDE sqlca;

TX_SERVICE(MM_OL_0023, ctx)
{
    EXEC SQL BEGIN DECLARE SECTION;
    char h_merch_id[16];
    char h_chg_date[9];
    char h_oper[16];
    long h_old_limit;
    long h_new_limit;
    EXEC SQL END DECLARE SECTION;

    char merch_id[16];
    char won_buf[32];
    long delta;

    tx_log(TX_LOG_INFO, "[MM_OL_0023] 한도 이력조회 서비스 진입");

    if (tx_buf_get(ctx->in, "MERCHID", merch_id, sizeof(merch_id)) != TX_OK) {
        tx_log(TX_LOG_ERROR, "[MM_OL_0023] MERCHID 누락");
        tx_buf_sets(ctx->out, "ERRCODE", "MM2300");
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }

    strncpy(h_merch_id, merch_id, sizeof(h_merch_id) - 1);
    h_merch_id[sizeof(h_merch_id) - 1] = '\0';

    /* 최근 한도변경 1건 (변경일 내림차순 선두) */
    EXEC SQL SELECT old_limit, new_limit, chg_date, oper
          INTO :h_old_limit, :h_new_limit, :h_chg_date, :h_oper
          FROM mm_limit_hist
         WHERE merch_id = :h_merch_id
         ORDER BY chg_date DESC, seq DESC
         FETCH FIRST 1 ROWS ONLY;

    if (sqlca.sqlcode == TX_SQL_NOTFOUND) {
        tx_log(TX_LOG_WARN, "[MM_OL_0023] 한도 이력 없음 merch=%s", merch_id);
        tx_buf_sets(ctx->out, "ERRCODE", "MM2301");
        tx_return(ctx, TX_ENOENT, ctx->out);
        return;
    }
    if (sqlca.sqlcode != TX_SQL_OK) {
        TX_DBIO_LOG_ERR("SELECT mm_limit_hist");
        tx_buf_sets(ctx->out, "ERRCODE", "MM2309");
        tx_return(ctx, TX_EDB, ctx->out);
        return;
    }

    delta = h_new_limit - h_old_limit;
    amount_format_won(h_new_limit, won_buf, sizeof(won_buf));

    tx_buf_reset(ctx->out);
    tx_buf_sets(ctx->out, "MERCHID", merch_id);
    tx_buf_setlong(ctx->out, "OLDLIMIT", h_old_limit);
    tx_buf_setlong(ctx->out, "NEWLIMIT", h_new_limit);
    tx_buf_setlong(ctx->out, "DELTA", delta);
    tx_buf_sets(ctx->out, "NEWLIMITWON", won_buf);
    tx_buf_sets(ctx->out, "CHGDATE", h_chg_date);
    tx_buf_sets(ctx->out, "OPER", h_oper);
    tx_buf_sets(ctx->out, "ERRCODE", RESP_OK);
    tx_log(TX_LOG_INFO, "[MM_OL_0023] 한도 이력조회 완료 merch=%s 한도=%ld(변동%ld)",
           merch_id, h_new_limit, delta);
    tx_return(ctx, TX_OK, ctx->out);
}
