/* @tier easy @module ac @transform acquire-online */
/*
 * ac_ol_0010.pgc - 매입 온라인 서비스 (AC_OL_0010)  [tier=easy]
 *
 * 매입 한도체크: 가맹점의 당일 누적매입액(미확정 제외)에 신규 매입금액을
 * 더해 merchant.limit_amt 를 넘는지 검사한다. 초과 시 TX_FAIL 로 거절한다.
 */
#include <stdio.h>
#include <string.h>

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

EXEC SQL INCLUDE sqlca;

TX_SERVICE(AC_OL_0010, ctx)
{
    EXEC SQL BEGIN DECLARE SECTION;
    char h_merch[16];
    char h_today[9];
    long h_limit;
    long h_used;
    EXEC SQL END DECLARE SECTION;

    char merch[16];
    char today[9];
    long amount = 0;
    long remain;
    int  over;

    tx_log(TX_LOG_INFO, "[AC_OL_0010] 매입 한도체크 서비스 진입");

    if (tx_buf_get(ctx->in, "MERCHID", merch, sizeof(merch)) != TX_OK) {
        tx_log(TX_LOG_ERROR, "[AC_OL_0010] MERCHID 누락");
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }
    tx_buf_getlong(ctx->in, "AMOUNT", &amount);

    if (merch[0] == '\0' || !amount_is_valid(amount)) {
        tx_log(TX_LOG_WARN, "[AC_OL_0010] 입력 검증 실패 merch=%s amount=%ld", merch, amount);
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }

    strncpy(h_merch, merch, sizeof(h_merch) - 1);
    h_merch[sizeof(h_merch) - 1] = '\0';

    EXEC SQL SELECT limit_amt
        INTO :h_limit
        FROM merchant
        WHERE merch_id = :h_merch;

    if (sqlca.sqlcode == TX_SQL_NOTFOUND) {
        tx_log(TX_LOG_WARN, "[AC_OL_0010] 가맹점 없음 merch=%s", merch);
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_NOMERCH);
        tx_return(ctx, TX_ENOENT, ctx->out);
        return;
    }
    if (sqlca.sqlcode != TX_SQL_OK) {
        TX_DBIO_LOG_ERR("AC_OL_0010 merchant select");
        tx_return(ctx, TX_EDB, ctx->out);
        return;
    }

    date_today(today);
    strncpy(h_today, today, sizeof(h_today) - 1);
    h_today[sizeof(h_today) - 1] = '\0';

    EXEC SQL SELECT coalesce(sum(amount), 0)
        INTO :h_used
        FROM ac_ledger
        WHERE merch_id = :h_merch
          AND biz_date = :h_today
          AND status  <> 'U';

    if (sqlca.sqlcode != TX_SQL_OK) {
        TX_DBIO_LOG_ERR("AC_OL_0010 ac_ledger sum select");
        tx_return(ctx, TX_EDB, ctx->out);
        return;
    }

    over = (h_used + amount > h_limit) ? 1 : 0;
    remain = h_limit - h_used - amount;
    if (remain < 0)
        remain = 0;

    tx_buf_reset(ctx->out);
    if (over) {
        tx_log(TX_LOG_WARN, "[AC_OL_0010] 한도초과 merch=%s used=%ld amount=%ld limit=%ld",
               merch, h_used, amount, h_limit);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_INVALID);
        tx_buf_setlong(ctx->out, "OVER", 1);
        tx_buf_setlong(ctx->out, "LIMIT", h_limit);
        tx_buf_setlong(ctx->out, "USED", h_used);
        tx_buf_setlong(ctx->out, "REMAIN", 0);
        tx_return(ctx, TX_FAIL, ctx->out);
        return;
    }

    tx_buf_sets(ctx->out, "RESPCODE", RESP_OK);
    tx_buf_setlong(ctx->out, "OVER", 0);
    tx_buf_setlong(ctx->out, "LIMIT", h_limit);
    tx_buf_setlong(ctx->out, "USED", h_used);
    tx_buf_setlong(ctx->out, "REMAIN", remain);
    tx_log(TX_LOG_INFO, "[AC_OL_0010] 한도체크 통과 merch=%s remain=%ld", merch, remain);
    tx_return(ctx, TX_OK, ctx->out);
}