/* @tier hard @module mm @transform master-online */
/*
 * mm_ol_0031.pgc - 마스터 변경이력조회 서비스 (MM_OL_0031)  [tier=hard]
 *
 * 가맹점의 변경이력(mm_merchant_hist) 중 가장 최근 1건을 조회하여
 * 변경유형(I/U/C/D)/변경일/변경상태를 응답하고, 유형코드를 한글 라벨로
 * 매핑한다. 이력 총건수도 함께 집계한다. 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_0031, ctx)
{
    EXEC SQL BEGIN DECLARE SECTION;
    char h_merch_id[16];
    char h_chg_type[2];
    char h_chg_date[9];
    char h_chg_status[2];
    long h_hist_cnt;
    EXEC SQL END DECLARE SECTION;

    char merch_id[16];
    char type_nm[16];

    tx_log(TX_LOG_INFO, "[MM_OL_0031] 마스터 변경이력조회 서비스 진입");

    if (tx_buf_get(ctx->in, "MERCHID", merch_id, sizeof(merch_id)) != TX_OK) {
        tx_log(TX_LOG_ERROR, "[MM_OL_0031] MERCHID 누락");
        tx_buf_sets(ctx->out, "ERRCODE", "MM3100");
        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';

    /* 1) 최근 변경이력 1건 */
    EXEC SQL SELECT chg_type, chg_date, chg_status
          INTO :h_chg_type, :h_chg_date, :h_chg_status
          FROM mm_merchant_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_0031] 변경이력 없음 merch=%s", merch_id);
        tx_buf_sets(ctx->out, "ERRCODE", "MM3101");
        tx_return(ctx, TX_ENOENT, ctx->out);
        return;
    }
    if (sqlca.sqlcode != TX_SQL_OK) {
        TX_DBIO_LOG_ERR("SELECT mm_merchant_hist recent");
        tx_buf_sets(ctx->out, "ERRCODE", "MM3109");
        tx_return(ctx, TX_EDB, ctx->out);
        return;
    }

    /* 2) 이력 총건수 집계 */
    h_hist_cnt = 0;
    EXEC SQL SELECT COUNT(*) INTO :h_hist_cnt
          FROM mm_merchant_hist
         WHERE merch_id = :h_merch_id;

    if (sqlca.sqlcode != TX_SQL_OK && sqlca.sqlcode != TX_SQL_NOTFOUND) {
        TX_DBIO_LOG_ERR("COUNT mm_merchant_hist");
        tx_buf_sets(ctx->out, "ERRCODE", "MM3109");
        tx_return(ctx, TX_EDB, ctx->out);
        return;
    }

    /* 변경유형 → 한글 라벨 */
    if (strcmp(h_chg_type, "I") == 0)
        strncpy(type_nm, "등록", sizeof(type_nm) - 1);
    else if (strcmp(h_chg_type, "U") == 0)
        strncpy(type_nm, "대표자변경", sizeof(type_nm) - 1);
    else if (strcmp(h_chg_type, "C") == 0)
        strncpy(type_nm, "연락처변경", sizeof(type_nm) - 1);
    else if (strcmp(h_chg_type, "D") == 0)
        strncpy(type_nm, "해지", sizeof(type_nm) - 1);
    else
        strncpy(type_nm, "기타", sizeof(type_nm) - 1);

    tx_buf_reset(ctx->out);
    tx_buf_sets(ctx->out, "MERCHID", merch_id);
    tx_buf_sets(ctx->out, "CHGTYPE", h_chg_type);
    tx_buf_sets(ctx->out, "CHGTYPENM", type_nm);
    tx_buf_sets(ctx->out, "CHGDATE", h_chg_date);
    tx_buf_sets(ctx->out, "CHGSTATUS", h_chg_status);
    tx_buf_setlong(ctx->out, "HISTCNT", h_hist_cnt);
    tx_buf_sets(ctx->out, "ERRCODE", RESP_OK);
    tx_log(TX_LOG_INFO, "[MM_OL_0031] 변경이력조회 완료 merch=%s 유형=%s 총%ld건",
           merch_id, type_nm, h_hist_cnt);
    tx_return(ctx, TX_OK, ctx->out);
}