/* @tier hard @module mm @transform master-online */
/*
 * mm_ol_0020.pgc - 가맹점 비활성(해지) 서비스 (MM_OL_0020)  [tier=hard]
 *
 * 가맹점 해지 요청 시 미정산 잔액(mm_settle_balance)을 먼저 확인하고,
 * 잔액이 남아 있으면 해지를 반려한다. 잔액이 0 이면 mm_merchant.status
 * 를 'U'(해지)로 UPDATE 하고 상태변경 이력(mm_status_hist)을 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_0020, ctx)
{
    EXEC SQL BEGIN DECLARE SECTION;
    char h_merch_id[16];
    char h_reason[64];
    char h_oper[16];
    char h_old_status[2];
    char h_new_status[2];
    char h_chg_date[9];
    long h_balance;
    EXEC SQL END DECLARE SECTION;

    char merch_id[16];
    char reason[64];
    char oper[16];
    char won_buf[32];

    tx_log(TX_LOG_INFO, "[MM_OL_0020] 가맹점 해지 서비스 진입");

    if (tx_buf_get(ctx->in, "MERCHID", merch_id, sizeof(merch_id)) != TX_OK ||
        tx_buf_get(ctx->in, "OPER",    oper,     sizeof(oper))     != TX_OK) {
        tx_log(TX_LOG_ERROR, "[MM_OL_0020] 필수 필드 누락");
        tx_buf_sets(ctx->out, "ERRCODE", "MM2000");
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }
    if (tx_buf_get(ctx->in, "REASON", reason, sizeof(reason)) != TX_OK)
        strncpy(reason, "가맹점요청", sizeof(reason) - 1);

    strncpy(h_merch_id, merch_id, sizeof(h_merch_id) - 1);
    h_merch_id[sizeof(h_merch_id) - 1] = '\0';
    strncpy(h_oper, oper, sizeof(h_oper) - 1);
    h_oper[sizeof(h_oper) - 1] = '\0';
    strncpy(h_reason, reason, sizeof(h_reason) - 1);
    h_reason[sizeof(h_reason) - 1] = '\0';
    strncpy(h_new_status, MM_ST_FAIL, sizeof(h_new_status));  /* 'U' 해지 */
    date_today(h_chg_date);

    /* 1) 현재 상태 확인 (이미 해지면 반려) */
    EXEC SQL
        SELECT status INTO :h_old_status
          FROM mm_merchant
         WHERE merch_id = :h_merch_id;

    if (sqlca.sqlcode == TX_SQL_NOTFOUND) {
        tx_log(TX_LOG_WARN, "[MM_OL_0020] 가맹점 없음 merch=%s", merch_id);
        tx_buf_sets(ctx->out, "ERRCODE", "MM2001");
        tx_return(ctx, TX_ENOENT, ctx->out);
        return;
    }
    if (sqlca.sqlcode != TX_SQL_OK) {
        TX_DBIO_LOG_ERR("SELECT mm_merchant status");
        tx_buf_sets(ctx->out, "ERRCODE", "MM2009");
        tx_return(ctx, TX_EDB, ctx->out);
        return;
    }
    if (strcmp(h_old_status, MM_ST_FAIL) == 0) {
        tx_log(TX_LOG_WARN, "[MM_OL_0020] 이미 해지된 가맹점 merch=%s", merch_id);
        tx_buf_sets(ctx->out, "ERRCODE", "MM2002");
        tx_return(ctx, TX_FAIL, ctx->out);
        return;
    }

    /* 2) 미정산 잔액 확인 */
    h_balance = 0;
    EXEC SQL
        SELECT COALESCE(SUM(balance), 0) INTO :h_balance
          FROM mm_settle_balance
         WHERE merch_id = :h_merch_id
           AND settle_yn = 'N';

    if (sqlca.sqlcode != TX_SQL_OK && sqlca.sqlcode != TX_SQL_NOTFOUND) {
        TX_DBIO_LOG_ERR("SELECT mm_settle_balance");
        tx_buf_sets(ctx->out, "ERRCODE", "MM2009");
        tx_return(ctx, TX_EDB, ctx->out);
        return;
    }
    if (h_balance > 0) {
        amount_format_won(h_balance, won_buf, sizeof(won_buf));
        tx_log(TX_LOG_WARN, "[MM_OL_0020] 미정산 잔액 존재 merch=%s 잔액=%ld",
               merch_id, h_balance);
        tx_buf_reset(ctx->out);
        tx_buf_setlong(ctx->out, "BALANCE", h_balance);
        tx_buf_sets(ctx->out, "BALWON", won_buf);
        tx_buf_sets(ctx->out, "ERRCODE", "MM2003");
        tx_return(ctx, TX_FAIL, ctx->out);
        return;
    }

    /* 3) 트랜잭션: 상태 UPDATE + 이력 INSERT */
    if (tx_begin() != TX_OK)
        tx_log(TX_LOG_WARN, "[MM_OL_0020] tx_begin 경고");

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

    if (sqlca.sqlcode != TX_SQL_OK) {
        TX_DBIO_LOG_ERR("UPDATE mm_merchant status");
        tx_abort();
        tx_buf_sets(ctx->out, "ERRCODE", "MM2004");
        tx_return(ctx, TX_EDB, ctx->out);
        return;
    }

    EXEC SQL
        INSERT INTO mm_status_hist
               (merch_id, old_status, new_status, chg_date, oper, reason)
        VALUES (:h_merch_id, :h_old_status, :h_new_status, :h_chg_date,
                :h_oper, :h_reason);

    if (sqlca.sqlcode != TX_SQL_OK) {
        TX_DBIO_LOG_ERR("INSERT mm_status_hist");
        tx_abort();
        tx_buf_sets(ctx->out, "ERRCODE", "MM2005");
        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, "STATUS", h_new_status);
    tx_buf_sets(ctx->out, "CHGDATE", h_chg_date);
    tx_buf_sets(ctx->out, "ERRCODE", RESP_OK);
    tx_log(TX_LOG_INFO, "[MM_OL_0020] 가맹점 해지완료 merch=%s", merch_id);
    tx_return(ctx, TX_OK, ctx->out);
}
