/* @tier easy @module vl @transform validation-online */
/*
 * vl_ol_0012.pgc - 가맹점 한도 정합 검증 서비스 (VL_OL_0012)
 *
 * 가맹점 일한도(vl_limit) 를 조회하고, 당일 원장(vl_ledger) 누적금액을 합산한
 * 뒤 신규 요청금액을 더해 한도 초과 여부를 판정한다. 초과 시 불일치(VL12xx).
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

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

EXEC SQL INCLUDE sqlca;

TX_SERVICE(VL_OL_0012, ctx)
{
    EXEC SQL BEGIN DECLARE SECTION;
    char h_merch[16];
    char h_bizdate[9];
    long h_daily_limit;
    long h_used_amt;
    EXEC SQL END DECLARE SECTION;

    char merch[16], bizdate[16];
    long amount = 0, projected;

    tx_log(TX_LOG_INFO, "[VL_OL_0012] 한도 정합 검증 서비스 진입");

    if (tx_buf_get(ctx->in, "MERCHID", merch, sizeof(merch)) != TX_OK ||
        tx_buf_get(ctx->in, "BIZDATE", bizdate, sizeof(bizdate)) != TX_OK) {
        tx_log(TX_LOG_ERROR, "[VL_OL_0012] 필수 필드 누락(MERCHID/BIZDATE)");
        tx_buf_sets(ctx->out, "ERRCODE", "VL1200");
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }
    tx_buf_getlong(ctx->in, "AMOUNT", &amount);
    if (!date_is_valid(bizdate) || amount < 0) {
        tx_log(TX_LOG_WARN, "[VL_OL_0012] 입력값 오류 date=%s amt=%ld", bizdate, amount);
        tx_buf_sets(ctx->out, "ERRCODE", "VL1201");
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }

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

    /* 1) 가맹점 일한도 조회 */
    EXEC SQL SELECT daily_limit
          INTO :h_daily_limit
          FROM vl_limit
         WHERE merch_id = :h_merch;

    if (sqlca.sqlcode == TX_SQL_NOTFOUND) {
        tx_log(TX_LOG_WARN, "[VL_OL_0012] 한도 미설정 merch=%s", merch);
        tx_buf_sets(ctx->out, "RESULT", "MISMATCH");
        tx_buf_sets(ctx->out, "ERRCODE", "VL1202");
        tx_return(ctx, TX_ENOENT, ctx->out);
        return;
    }
    if (sqlca.sqlcode != TX_SQL_OK) {
        TX_DBIO_LOG_ERR("SELECT vl_limit");
        tx_buf_sets(ctx->out, "ERRCODE", "VL1209");
        tx_return(ctx, TX_EDB, ctx->out);
        return;
    }

    /* 2) 당일 누적금액 합산 */
    EXEC SQL SELECT COALESCE(SUM(amount), 0)
          INTO :h_used_amt
          FROM vl_ledger
         WHERE merch_id = :h_merch
           AND txn_date = :h_bizdate;

    if (sqlca.sqlcode != TX_SQL_OK && sqlca.sqlcode != TX_SQL_NOTFOUND) {
        TX_DBIO_LOG_ERR("SELECT SUM vl_ledger");
        tx_buf_sets(ctx->out, "ERRCODE", "VL1219");
        tx_return(ctx, TX_EDB, ctx->out);
        return;
    }

    /* 3) 한도 판정 */
    projected = h_used_amt + amount;

    tx_buf_reset(ctx->out);
    tx_buf_sets(ctx->out, "MERCHID", merch);
    tx_buf_setlong(ctx->out, "DAILYLIMIT", h_daily_limit);
    tx_buf_setlong(ctx->out, "USEDAMT", h_used_amt);
    tx_buf_setlong(ctx->out, "REQAMT", amount);
    tx_buf_setlong(ctx->out, "PROJECTED", projected);

    if (projected > h_daily_limit) {
        tx_log(TX_LOG_WARN, "[VL_OL_0012] 한도 초과 merch=%s proj=%ld limit=%ld",
               merch, projected, h_daily_limit);
        tx_buf_sets(ctx->out, "RESULT", "MISMATCH");
        tx_buf_sets(ctx->out, "ERRCODE", "VL1203");
        tx_return(ctx, TX_OK, ctx->out);
        return;
    }

    tx_buf_sets(ctx->out, "RESULT", "MATCH");
    tx_buf_sets(ctx->out, "ERRCODE", RESP_OK);
    tx_log(TX_LOG_INFO, "[VL_OL_0012] 한도 이내 merch=%s proj=%ld limit=%ld",
           merch, projected, h_daily_limit);
    tx_return(ctx, TX_OK, ctx->out);
}
