/* @tier medium @module st @transform settlement-online */
/*
 * st_ol_0020.pgc - 정산 수수료 재계산 (ST_OL_0020)  [tier=medium]
 *
 * 원장 건을 조회하여 표준요율로 수수료를 재계산하고, 재계산 전/후
 * 수수료와 정산순액 변동분(delta)을 응답한다. APPLY=Y 이면 재계산
 * 수수료를 원장(st_ledger)에 임베디드 UPDATE 로 반영한다.
 */
#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_0020, ctx)
{
    EXEC SQL BEGIN DECLARE SECTION;
    char h_key[16];
    long h_amount;
    long h_old_fee;
    long h_new_fee;
    long h_affected;
    EXEC SQL END DECLARE SECTION;

    char key[16], apply[4];
    long std_bp = 0, new_fee, delta, new_net;
    int  applied = 0;

    tx_log(TX_LOG_INFO, "[ST_OL_0020] 정산 재계산 진입");

    if (tx_buf_get(ctx->in, "KEY", key, sizeof(key)) != TX_OK) {
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }
    tx_buf_getlong(ctx->in, "STDBP", &std_bp);
    if (std_bp <= 0) std_bp = 180;
    if (tx_buf_get(ctx->in, "APPLY", apply, sizeof(apply)) != TX_OK)
        strcpy(apply, "N");

    /* 원장 금액/기존 수수료 조회 */
    strncpy(h_key, key, sizeof(h_key) - 1);
    h_key[sizeof(h_key) - 1] = '\0';
    h_amount = 0;
    h_old_fee = 0;
    EXEC SQL SELECT amount, fee
        INTO :h_amount, :h_old_fee
        FROM st_ledger
        WHERE key = :h_key;

    if (sqlca.sqlcode == TX_SQL_NOTFOUND) {
        tx_return(ctx, TX_ENOENT, ctx->out);
        return;
    }
    if (sqlca.sqlcode != TX_SQL_OK) {
        TX_DBIO_LOG_ERR("SELECT st_ledger 재계산");
        tx_return(ctx, TX_EDB, ctx->out);
        return;
    }

    new_fee = st_fee_round(h_amount, std_bp);
    delta   = new_fee - h_old_fee;
    new_net = h_amount - new_fee;

    /* APPLY=Y 이면 재계산 수수료 반영 */
    if (strcmp(apply, "Y") == 0 && delta != 0) {
        h_new_fee = new_fee;
        if (tx_begin() != TX_OK)
            tx_log(TX_LOG_WARN, "[ST_OL_0020] tx_begin 경고");
        EXEC SQL UPDATE st_ledger
            SET fee = :h_new_fee, upd_ts = now()
            WHERE key = :h_key;
        if (sqlca.sqlcode != TX_SQL_OK) {
            TX_DBIO_LOG_ERR("UPDATE st_ledger 수수료반영");
            tx_abort();
            tx_return(ctx, TX_EDB, ctx->out);
            return;
        }
        h_affected = sqlca.sqlerrd[2];
        tx_commit();
        applied = (h_affected > 0);
    }

    tx_buf_reset(ctx->out);
    tx_buf_sets(ctx->out, "RESPCODE", RESP_OK);
    tx_buf_sets(ctx->out, "KEY", key);
    tx_buf_setlong(ctx->out, "OLDFEE", h_old_fee);
    tx_buf_setlong(ctx->out, "NEWFEE", new_fee);
    tx_buf_setlong(ctx->out, "DELTA", delta);
    tx_buf_setlong(ctx->out, "NEWNET", new_net);
    tx_buf_sets(ctx->out, "APPLIED", applied ? "Y" : "N");
    tx_log(TX_LOG_INFO, "[ST_OL_0020] 재계산 key=%s old=%ld new=%ld delta=%ld apply=%s",
           key, h_old_fee, new_fee, delta, applied ? "Y" : "N");
    tx_return(ctx, TX_OK, ctx->out);
}