/* @tier easy @module mm @transform master-online */
/*
 * mm_ol_0019.pgc - 가맹점 등급변경 서비스 (MM_OL_0019)  [tier=easy]
 *
 * 신규 등급코드의 유효성(mm_grade_code 사용중 여부)을 확인한 뒤
 * mm_merchant.grade 를 UPDATE 하고, 등급변경 이력(mm_grade_hist)에
 * 이전등급/신규등급/변경자 행을 남긴다. (CRUD + 이력)
 */
#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_0019, ctx)
{
    EXEC SQL BEGIN DECLARE SECTION;
    char h_merch_id[16];
    char h_new_grade[4];
    char h_old_grade[4];
    char h_oper[16];
    char h_chg_date[9];
    long h_valid;
    EXEC SQL END DECLARE SECTION;

    char merch_id[16];
    char new_grade[4];
    char oper[16];

    tx_log(TX_LOG_INFO, "[MM_OL_0019] 가맹점 등급변경 서비스 진입");

    if (tx_buf_get(ctx->in, "MERCHID", merch_id, sizeof(merch_id)) != TX_OK ||
        tx_buf_get(ctx->in, "GRADE",   new_grade, sizeof(new_grade)) != TX_OK ||
        tx_buf_get(ctx->in, "OPER",    oper,      sizeof(oper))      != TX_OK) {
        tx_log(TX_LOG_ERROR, "[MM_OL_0019] 필수 필드 누락");
        tx_buf_sets(ctx->out, "ERRCODE", "MM1900");
        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';
    strncpy(h_new_grade, new_grade, sizeof(h_new_grade) - 1);
    h_new_grade[sizeof(h_new_grade) - 1] = '\0';
    strncpy(h_oper, oper, sizeof(h_oper) - 1);
    h_oper[sizeof(h_oper) - 1] = '\0';
    date_today(h_chg_date);

    /* 1) 신규 등급코드 유효성(사용중 'Y') 확인 */
    EXEC SQL
        SELECT COUNT(*) INTO :h_valid
          FROM mm_grade_code
         WHERE grade = :h_new_grade
           AND use_yn = 'Y';

    if (sqlca.sqlcode != TX_SQL_OK && sqlca.sqlcode != TX_SQL_NOTFOUND) {
        TX_DBIO_LOG_ERR("SELECT mm_grade_code");
        tx_buf_sets(ctx->out, "ERRCODE", "MM1909");
        tx_return(ctx, TX_EDB, ctx->out);
        return;
    }
    if (h_valid <= 0) {
        tx_log(TX_LOG_WARN, "[MM_OL_0019] 유효하지 않은 등급코드 grade=%s", new_grade);
        tx_buf_sets(ctx->out, "ERRCODE", "MM1901");
        tx_return(ctx, TX_FAIL, ctx->out);
        return;
    }

    /* 2) 현재 등급 조회(이력용 이전값 확보) */
    EXEC SQL
        SELECT grade INTO :h_old_grade
          FROM mm_merchant
         WHERE merch_id = :h_merch_id;

    if (sqlca.sqlcode == TX_SQL_NOTFOUND) {
        tx_log(TX_LOG_WARN, "[MM_OL_0019] 가맹점 없음 merch=%s", merch_id);
        tx_buf_sets(ctx->out, "ERRCODE", "MM1902");
        tx_return(ctx, TX_ENOENT, ctx->out);
        return;
    }
    if (sqlca.sqlcode != TX_SQL_OK) {
        TX_DBIO_LOG_ERR("SELECT mm_merchant grade");
        tx_buf_sets(ctx->out, "ERRCODE", "MM1909");
        tx_return(ctx, TX_EDB, ctx->out);
        return;
    }

    if (strcmp(h_old_grade, h_new_grade) == 0) {
        tx_log(TX_LOG_WARN, "[MM_OL_0019] 등급 변동 없음 merch=%s grade=%s",
               merch_id, new_grade);
        tx_buf_sets(ctx->out, "ERRCODE", "MM1903");
        tx_return(ctx, TX_FAIL, ctx->out);
        return;
    }

    /* 3) 트랜잭션: 등급 UPDATE + 이력 INSERT */
    if (tx_begin() != TX_OK)
        tx_log(TX_LOG_WARN, "[MM_OL_0019] tx_begin 경고");

    EXEC SQL
        UPDATE mm_merchant
           SET grade = :h_new_grade,
               upd_date = :h_chg_date
         WHERE merch_id = :h_merch_id;

    if (sqlca.sqlcode != TX_SQL_OK) {
        TX_DBIO_LOG_ERR("UPDATE mm_merchant grade");
        tx_abort();
        tx_buf_sets(ctx->out, "ERRCODE", "MM1904");
        tx_return(ctx, TX_EDB, ctx->out);
        return;
    }

    EXEC SQL
        INSERT INTO mm_grade_hist
               (merch_id, old_grade, new_grade, chg_date, oper)
        VALUES (:h_merch_id, :h_old_grade, :h_new_grade, :h_chg_date, :h_oper);

    if (sqlca.sqlcode != TX_SQL_OK) {
        TX_DBIO_LOG_ERR("INSERT mm_grade_hist");
        tx_abort();
        tx_buf_sets(ctx->out, "ERRCODE", "MM1905");
        tx_return(ctx, TX_EDB, ctx->out);
        return;
    }

    tx_commit();

    tx_buf_reset(ctx->out);
    tx_buf_sets(ctx->out, "MERCHID", merch_id);
    tx_buf_sets(ctx->out, "OLDGRADE", h_old_grade);
    tx_buf_sets(ctx->out, "NEWGRADE", h_new_grade);
    tx_buf_sets(ctx->out, "CHGDATE", h_chg_date);
    tx_buf_sets(ctx->out, "ERRCODE", RESP_OK);
    tx_log(TX_LOG_INFO, "[MM_OL_0019] 등급변경 완료 merch=%s %s->%s",
           merch_id, h_old_grade, h_new_grade);
    tx_return(ctx, TX_OK, ctx->out);
}