/* @tier medium @module py @transform payment-online */
/*
 * py_ol_0009.pgc - 지급 이자계산(지연일수 이자 산출) (PY_OL_0009)  [tier=medium]
 *
 * TxCore TX_SERVICE 엔트리. 요청 TXBUF 를 검증하고 임베디드 SQL / 표준
 * DBIO / tx_call 로 처리한 뒤 응답 TXBUF 를 구성한다.
 */
#include <stdio.h>
#include <string.h>

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

EXEC SQL INCLUDE sqlca;

TX_SERVICE(PY_OL_0009, ctx)
{
    char key[16];
    if (tx_buf_get(ctx->in, "KEY", key, sizeof(key)) != TX_OK) {
        tx_log(TX_LOG_ERROR, "[PY_OL_0009] KEY 누락");
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }
    EXEC SQL BEGIN DECLARE SECTION;
    char h_key[16], h_bdate[9];
    long h_amount, h_interest;
    EXEC SQL END DECLARE SECTION;

    char today[16];
    long days = 0;

    tx_log(TX_LOG_INFO, "[PY_OL_0009] 지급 이자계산 진입");
    tx_buf_getlong(ctx->in, "DELAYDAYS", &days);
    if (days < 0) days = 0;
    strncpy(h_key, key, 15); h_key[15] = '\0';

    EXEC SQL SELECT amount, biz_date INTO :h_amount, :h_bdate
        FROM py_ledger WHERE key = :h_key;
    if (sqlca.sqlcode == TX_SQL_NOTFOUND) { tx_return(ctx, TX_ENOENT, ctx->out); return; }

    /* 연 7.3% -> 일 0.02% (2 basis point) */
    h_interest = h_amount * 2 * days / 10000;

    if (tx_begin() != TX_OK) tx_log(TX_LOG_WARN, "[PY_OL_0009] tx_begin 경고");
    EXEC SQL UPDATE py_ledger SET fee = :h_interest, upd_ts = now() WHERE key = :h_key;
    if (sqlca.sqlcode != TX_SQL_OK) {
        TX_DBIO_LOG_ERR("py_ol_0009 이자"); tx_abort();
        tx_return(ctx, TX_EDB, ctx->out); return;
    }
    tx_commit();

    date_today(today);
    tx_buf_reset(ctx->out);
    tx_buf_setlong(ctx->out, "PRINCIPAL", h_amount);
    tx_buf_setlong(ctx->out, "DELAYDAYS", days);
    tx_buf_setlong(ctx->out, "INTEREST", h_interest);
    tx_log(TX_LOG_INFO, "[PY_OL_0009] 이자 key=%s days=%ld interest=%ld", key, days, h_interest);
    tx_return(ctx, TX_OK, ctx->out);
}