/* @tier medium @module st @transform settlement-online */
/*
 * st_ol_0011.pgc - 지연정산 이자 계산 (ST_OL_0011)  [tier=medium]
 *
 * 정산 지급 지연일수에 대한 지연이자(연리 일할)를 산출한다.
 * 이자 = 원금 x 연리(만분율) x 지연일수 / 365 (원단위 반올림).
 * 연리 미입력 시 지연이자 정책(st_delay_policy)에서 조회한다.
 */
#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_0011, ctx)
{
    EXEC SQL BEGIN DECLARE SECTION;
    char h_grade[2];
    long h_annual_bp;
    EXEC SQL END DECLARE SECTION;

    char merch[16], grade[4];
    long principal = 0, annual_bp = 0, delay_days = 0, interest, total;

    tx_log(TX_LOG_INFO, "[ST_OL_0011] 지연정산 이자 계산 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, "PRINCIPAL", &principal);
    tx_buf_getlong(ctx->in, "ANNUALBP",  &annual_bp);
    tx_buf_getlong(ctx->in, "DELAYDAYS", &delay_days);
    if (tx_buf_get(ctx->in, "GRADE", grade, sizeof(grade)) != TX_OK)
        strncpy(grade, "A", sizeof(grade) - 1);

    /* 등급별 지연이자 연리 조회 */
    if (annual_bp <= 0) {
        strncpy(h_grade, grade, sizeof(h_grade) - 1);
        h_grade[sizeof(h_grade) - 1] = '\0';
        h_annual_bp = 0;
        EXEC SQL SELECT annual_bp
            INTO :h_annual_bp
            FROM st_delay_policy
            WHERE grade = :h_grade;
        if (sqlca.sqlcode == TX_SQL_OK && h_annual_bp > 0)
            annual_bp = h_annual_bp;
        else if (sqlca.sqlcode != TX_SQL_OK && sqlca.sqlcode != TX_SQL_NOTFOUND)
            TX_DBIO_LOG_ERR("SELECT st_delay_policy");
    }
    if (annual_bp <= 0) annual_bp = 1500;   /* 지연이자 연 15% */

    if (principal <= 0 || delay_days < 0) {
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_INVALID);
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }

    interest = st_fee_round(principal, annual_bp) * delay_days / 365;
    total    = principal + interest;

    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, "PRINCIPAL", principal);
    tx_buf_setlong(ctx->out, "ANNUALBP", annual_bp);
    tx_buf_setlong(ctx->out, "DELAYDAYS", delay_days);
    tx_buf_setlong(ctx->out, "INTEREST", interest);
    tx_buf_setlong(ctx->out, "TOTAL", total);
    tx_log(TX_LOG_INFO, "[ST_OL_0011] 지연이자 원금=%ld 일수=%ld 이자=%ld",
           principal, delay_days, interest);
    tx_return(ctx, TX_OK, ctx->out);
}