/* @tier medium @module st @transform settlement-online */
/*
 * st_ol_0007.pgc - 정산 부가세(VAT) 처리 (ST_OL_0007)  [tier=medium]
 *
 * 수수료(공급가액) 기준 부가세 10% 를 산출한다. 공급가/세액/합계를
 * 원단위 반올림으로 분해하여 세금계산서 항목을 구성하고, 부가세 대장
 * (st_vat_book)에 기표 로그를 적재한다.
 */
#include <stdio.h>
#include <string.h>

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

EXEC SQL INCLUDE sqlca;


static long st_fee_round(long amount, long rate_bp)
{
    /* 요율(만분율, basis point) x 금액 -> 원단위 반올림 (BigDecimal HALF_UP 대응) */
    if (amount < 0)
        return -(((-amount) * rate_bp + 5000) / 10000);
    return (amount * rate_bp + 5000) / 10000;
}

TX_SERVICE(ST_OL_0007, ctx)
{
    EXEC SQL BEGIN DECLARE SECTION;
    char h_merch[16];
    long h_supply;
    long h_vat;
    long h_total;
    EXEC SQL END DECLARE SECTION;

    char merch[16];
    long fee_supply = 0, vat, total;

    tx_log(TX_LOG_INFO, "[ST_OL_0007] 부가세(VAT) 처리 진입");

    if (tx_buf_get(ctx->in, "MERCHID", merch, sizeof(merch)) != TX_OK) {
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }
    tx_buf_getlong(ctx->in, "FEESUPPLY", &fee_supply);
    if (fee_supply < 0) {
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_INVALID);
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }

    vat   = st_fee_round(fee_supply, 1000);   /* 10% = 1000 만분율 */
    total = fee_supply + vat;

    /* 부가세 대장 기표 (트랜잭션 경계) */
    strncpy(h_merch, merch, sizeof(h_merch) - 1);
    h_merch[sizeof(h_merch) - 1] = '\0';
    h_supply = fee_supply;
    h_vat    = vat;
    h_total  = total;

    if (tx_begin() != TX_OK)
        tx_log(TX_LOG_WARN, "[ST_OL_0007] tx_begin 경고");

    EXEC SQL INSERT INTO st_vat_book
            (merch_id, supply_amt, vat_amt, total_amt, book_ts)
        VALUES
            (:h_merch, :h_supply, :h_vat, :h_total, now());

    if (sqlca.sqlcode != TX_SQL_OK) {
        TX_DBIO_LOG_ERR("INSERT st_vat_book");
        tx_abort();
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_SYSERR);
        tx_return(ctx, TX_EDB, ctx->out);
        return;
    }
    tx_commit();

    tx_buf_reset(ctx->out);
    tx_buf_sets(ctx->out, "RESPCODE", RESP_OK);
    tx_buf_sets(ctx->out, "MERCHID", merch);
    tx_buf_setlong(ctx->out, "SUPPLY", fee_supply);
    tx_buf_setlong(ctx->out, "VAT", vat);
    tx_buf_setlong(ctx->out, "TOTAL", total);
    tx_log(TX_LOG_INFO, "[ST_OL_0007] VAT 공급가=%ld 세액=%ld 합계=%ld",
           fee_supply, vat, total);
    tx_return(ctx, TX_OK, ctx->out);
}
