/* @tier easy @module st @transform settlement-online */
/*
 * st_ol_0010.pgc - 선정산 한도/금액 산정 (ST_OL_0010)  [tier=easy]
 *
 * 예상 정산순액에 선정산 인출비율을 적용하여 선지급 가능액을 산정하고
 * 선이자(일할)를 차감한 실 선지급액을 산출한다. 인출비율/연리 미입력 시
 * 가맹점 선정산 약정(st_advance_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_0010, ctx)
{
    EXEC SQL BEGIN DECLARE SECTION;
    char h_merch[16];
    long h_adv_rate_bp;
    long h_annual_bp;
    EXEC SQL END DECLARE SECTION;

    char merch[16];
    long expected = 0, advance_rate_bp = 0, days = 0, annual_bp = 0;
    long advance, interest, payout;

    tx_log(TX_LOG_INFO, "[ST_OL_0010] 선정산 산정 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, "EXPECTED", &expected);
    tx_buf_getlong(ctx->in, "ADVRATE",  &advance_rate_bp);
    tx_buf_getlong(ctx->in, "DAYS",     &days);
    tx_buf_getlong(ctx->in, "ANNUALBP", &annual_bp);
    if (days < 0) days = 0;

    /* 선정산 약정 조회 (인출비율/연리) */
    if (advance_rate_bp <= 0 || annual_bp <= 0) {
        strncpy(h_merch, merch, sizeof(h_merch) - 1);
        h_merch[sizeof(h_merch) - 1] = '\0';
        h_adv_rate_bp = 0;
        h_annual_bp   = 0;
        EXEC SQL SELECT advance_rate_bp, annual_bp
            INTO :h_adv_rate_bp, :h_annual_bp
            FROM st_advance_policy
            WHERE merch_id = :h_merch;
        if (sqlca.sqlcode == TX_SQL_OK) {
            if (advance_rate_bp <= 0) advance_rate_bp = h_adv_rate_bp;
            if (annual_bp <= 0)       annual_bp       = h_annual_bp;
        } else if (sqlca.sqlcode != TX_SQL_NOTFOUND) {
            TX_DBIO_LOG_ERR("SELECT st_advance_policy");
        }
    }
    if (advance_rate_bp <= 0 || advance_rate_bp > 10000) advance_rate_bp = 8000; /* 80% */
    if (annual_bp <= 0) annual_bp = 700;   /* 연 7% */

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

    advance  = st_fee_round(expected, advance_rate_bp);
    interest = st_fee_round(advance, annual_bp) * days / 365;
    payout   = advance - 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, "ADVANCE", advance);
    tx_buf_setlong(ctx->out, "INTEREST", interest);
    tx_buf_setlong(ctx->out, "PAYOUT", payout);
    tx_log(TX_LOG_INFO, "[ST_OL_0010] 선정산 advance=%ld 선이자=%ld 지급=%ld",
           advance, interest, payout);
    tx_return(ctx, TX_OK, ctx->out);
}