/* @tier easy @module mm @transform master-online */
/*
 * mm_ol_0004.pgc - 가맹점 상태변경 서비스 (MM_OL_0004)  [tier=easy]
 *
 * 가맹점 상태를 전이규칙(R->M->S, M->U 등)에 따라 검증한 뒤 mm_merchant
 * status 를 UPDATE 하고 상태이력(mm_status_hist) 에 이전/이후 상태를 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_0004, ctx)
{
    EXEC SQL BEGIN DECLARE SECTION;
    char h_merch_id[16];
    char h_cur_st[2];
    char h_new_st[2];
    char h_chg_date[9];
    long h_cnt;
    EXEC SQL END DECLARE SECTION;

    char merch_id[16];
    char new_st[2];
    int  allowed;

    tx_log(TX_LOG_INFO, "[MM_OL_0004] 가맹점 상태변경 서비스 진입");

    if (tx_buf_get(ctx->in, "MERCHID", merch_id, sizeof(merch_id)) != TX_OK ||
        tx_buf_get(ctx->in, "NEWST", new_st, sizeof(new_st)) != TX_OK) {
        tx_log(TX_LOG_ERROR, "[MM_OL_0004] 필수 필드 누락");
        tx_buf_sets(ctx->out, "ERRCODE", "MM0400");
        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_st, new_st, sizeof(h_new_st) - 1);
    h_new_st[sizeof(h_new_st) - 1] = '\0';
    date_today(h_chg_date);

    /* 현재 상태 조회 */
    EXEC SQL SELECT status INTO :h_cur_st
          FROM mm_merchant
         WHERE merch_id = :h_merch_id;

    if (sqlca.sqlcode == TX_SQL_NOTFOUND) {
        tx_log(TX_LOG_WARN, "[MM_OL_0004] 미등록 가맹점 merch=%s", merch_id);
        tx_buf_sets(ctx->out, "ERRCODE", "MM0401");
        tx_return(ctx, TX_ENOENT, ctx->out);
        return;
    }
    if (sqlca.sqlcode != TX_SQL_OK) {
        TX_DBIO_LOG_ERR("SELECT status mm_merchant");
        tx_buf_sets(ctx->out, "ERRCODE", "MM0402");
        tx_return(ctx, TX_EDB, ctx->out);
        return;
    }

    /* 상태전이 규칙검증: R->M, M->S, M->U 만 허용 */
    allowed = 0;
    if (strcmp(h_cur_st, MM_ST_RECV) == 0 && strcmp(h_new_st, MM_ST_DONE) == 0)
        allowed = 1;
    else if (strcmp(h_cur_st, MM_ST_DONE) == 0 && strcmp(h_new_st, MM_ST_SETTLED) == 0)
        allowed = 1;
    else if (strcmp(h_cur_st, MM_ST_DONE) == 0 && strcmp(h_new_st, MM_ST_FAIL) == 0)
        allowed = 1;

    if (!allowed) {
        tx_log(TX_LOG_WARN, "[MM_OL_0004] 상태전이 위반 %s->%s", h_cur_st, h_new_st);
        tx_buf_sets(ctx->out, "ERRCODE", "MM0403");
        tx_return(ctx, TX_FAIL, ctx->out);
        return;
    }

    if (tx_begin() != TX_OK)
        tx_log(TX_LOG_WARN, "[MM_OL_0004] tx_begin 경고");

    EXEC SQL UPDATE mm_merchant
           SET status   = :h_new_st,
               upd_date = :h_chg_date
         WHERE merch_id = :h_merch_id;

    if (sqlca.sqlcode != TX_SQL_OK) {
        TX_DBIO_LOG_ERR("UPDATE status mm_merchant");
        tx_abort();
        tx_buf_sets(ctx->out, "ERRCODE", "MM0404");
        tx_return(ctx, TX_EDB, ctx->out);
        return;
    }

    EXEC SQL INSERT INTO mm_status_hist
               (merch_id, prev_status, new_status, chg_date)
        VALUES (:h_merch_id, :h_cur_st, :h_new_st, :h_chg_date);

    if (sqlca.sqlcode != TX_SQL_OK) {
        TX_DBIO_LOG_ERR("INSERT mm_status_hist");
        tx_abort();
        tx_buf_sets(ctx->out, "ERRCODE", "MM0405");
        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, "PREVST", h_cur_st);
    tx_buf_sets(ctx->out, "NEWST", h_new_st);
    tx_buf_sets(ctx->out, "CHGDATE", h_chg_date);
    tx_buf_sets(ctx->out, "ERRCODE", RESP_OK);
    tx_log(TX_LOG_INFO, "[MM_OL_0004] 상태변경완료 merch=%s %s->%s",
           merch_id, h_cur_st, h_new_st);
    tx_return(ctx, TX_OK, ctx->out);
}