/* @tier hard @module st @transform settlement-online */
/*
 * st_ol_0004.pgc - VAN 수수료(건당 정액) 계산 (ST_OL_0004)  [tier=hard]
 *
 * 승인 건수에 VAN 건당 정액 수수료를 곱하여 총 VAN 수수료를 산출한다.
 * 정률 요소가 없는 건당 과금(전표/통신비) 모델. 승인건수 미입력 시
 * 당일 원장(st_ledger)의 실제 승인건수를 집계하여 사용한다.
 */
#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_0004, ctx)
{
    EXEC SQL BEGIN DECLARE SECTION;
    char h_merch[16];
    char h_bizdate[9];
    long h_txn_cnt;
    long h_unit_fee;
    EXEC SQL END DECLARE SECTION;

    char merch[16], bizdate[16];
    long amount = 0, txn_cnt = 0, unit_fee = 0, van_fee, net;

    tx_log(TX_LOG_INFO, "[ST_OL_0004] VAN 건당정액 수수료 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, "AMOUNT", &amount);
    tx_buf_getlong(ctx->in, "TXNCNT", &txn_cnt);

    strncpy(h_merch, merch, sizeof(h_merch) - 1);
    h_merch[sizeof(h_merch) - 1] = '\0';

    /* VAN 건당 정액 요율 조회 (없으면 기본 120원) */
    h_unit_fee = 0;
    EXEC SQL SELECT unit_fee
        INTO :h_unit_fee
        FROM st_van_fee
        WHERE merch_id = :h_merch;
    if (sqlca.sqlcode == TX_SQL_OK && h_unit_fee > 0)
        unit_fee = h_unit_fee;
    else if (sqlca.sqlcode != TX_SQL_OK && sqlca.sqlcode != TX_SQL_NOTFOUND)
        TX_DBIO_LOG_ERR("SELECT st_van_fee");
    if (unit_fee <= 0)
        unit_fee = 120;

    /* 승인건수 미입력 시 당일 원장 실제 승인건수 집계 */
    if (txn_cnt <= 0 &&
        tx_buf_get(ctx->in, "BIZDATE", bizdate, sizeof(bizdate)) == TX_OK &&
        date_is_valid(bizdate)) {
        strncpy(h_bizdate, bizdate, sizeof(h_bizdate) - 1);
        h_bizdate[sizeof(h_bizdate) - 1] = '\0';
        h_txn_cnt = 0;
        EXEC SQL SELECT count(*)
            INTO :h_txn_cnt
            FROM st_ledger
            WHERE merch_id = :h_merch
              AND biz_date = :h_bizdate;
        if (sqlca.sqlcode == TX_SQL_OK)
            txn_cnt = h_txn_cnt;
    }

    if (txn_cnt <= 0) {
        tx_log(TX_LOG_WARN, "[ST_OL_0004] 승인건수 오류 cnt=%ld", txn_cnt);
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_INVALID);
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }

    van_fee = unit_fee * txn_cnt;
    net     = amount - van_fee;

    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, "TXNCNT", txn_cnt);
    tx_buf_setlong(ctx->out, "UNITFEE", unit_fee);
    tx_buf_setlong(ctx->out, "VANFEE", van_fee);
    tx_buf_setlong(ctx->out, "NET", net);
    tx_log(TX_LOG_INFO, "[ST_OL_0004] VAN 수수료 cnt=%ld unit=%ld total=%ld",
           txn_cnt, unit_fee, van_fee);
    tx_return(ctx, TX_OK, ctx->out);
}