/* @tier easy @module st @transform settlement-online */
/*
 * st_ol_0006.pgc - 정산금 netting 계산 (ST_OL_0006)  [tier=easy]
 *
 * 매출 - 환불 - 수수료 - 조정 을 상계(netting)하여 최종 지급 정산금을
 * 산출한다. 음수(가맹점 채무) 방향도 부호로 반환한다. 매출/환불 미입력
 * 시 당일 원장(st_ledger)에서 정산/실패 상태 합계로 대체 집계한다.
 */
#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;


TX_SERVICE(ST_OL_0006, ctx)
{
    EXEC SQL BEGIN DECLARE SECTION;
    char h_merch[16];
    char h_bizdate[9];
    long h_gross;
    long h_refund;
    EXEC SQL END DECLARE SECTION;

    char merch[16], bizdate[16];
    long gross = 0, refund = 0, fee = 0, adj = 0, net;
    const char *dir;

    tx_log(TX_LOG_INFO, "[ST_OL_0006] 정산금 netting 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, "GROSS",  &gross);
    tx_buf_getlong(ctx->in, "REFUND", &refund);
    tx_buf_getlong(ctx->in, "FEE",    &fee);
    tx_buf_getlong(ctx->in, "ADJ",    &adj);

    /* 매출/환불 미입력 시 원장에서 상태별 합계로 대체 집계 */
    if ((gross <= 0 || refund <= 0) &&
        tx_buf_get(ctx->in, "BIZDATE", bizdate, sizeof(bizdate)) == TX_OK &&
        date_is_valid(bizdate)) {
        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_gross = 0;
        h_refund = 0;
        EXEC SQL SELECT
                coalesce(sum(amount) filter (where amount >= 0), 0),
                coalesce(-sum(amount) filter (where amount < 0), 0)
            INTO :h_gross, :h_refund
            FROM st_ledger
            WHERE merch_id = :h_merch
              AND biz_date = :h_bizdate;
        if (sqlca.sqlcode == TX_SQL_OK) {
            if (gross  <= 0) gross  = h_gross;
            if (refund <= 0) refund = h_refund;
        } else if (sqlca.sqlcode != TX_SQL_NOTFOUND) {
            TX_DBIO_LOG_ERR("SELECT netting 집계");
        }
    }

    if (gross < 0 || refund < 0 || fee < 0) {
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_INVALID);
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }

    net = gross - refund - fee + adj;
    dir = (net >= 0) ? "PAY" : "CLAWBACK";   /* 지급 / 회수 */

    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, "GROSS", gross);
    tx_buf_setlong(ctx->out, "REFUND", refund);
    tx_buf_setlong(ctx->out, "FEE", fee);
    tx_buf_setlong(ctx->out, "NET", net);
    tx_buf_sets(ctx->out, "DIR", dir);
    tx_log(TX_LOG_INFO, "[ST_OL_0006] netting gross=%ld refund=%ld fee=%ld net=%ld(%s)",
           gross, refund, fee, net, dir);
    tx_return(ctx, TX_OK, ctx->out);
}
