/* @tier medium @module st @transform settlement-online */
/*
 * st_ol_0027.pgc - 부분취소 정산 반영 (ST_OL_0027)  [tier=medium]
 *
 * 원거래 부분취소 시 취소금액을 차감한 잔여금액을 산출하고, 수수료를
 * 잔여금액 기준으로 비례 재계산한다. KEY 지정 시 원장(st_ledger)의 금액/
 * 수수료를 잔여기준으로 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_0027, ctx)
{
    EXEC SQL BEGIN DECLARE SECTION;
    char h_key[16];
    long h_orig;
    long h_remain;
    long h_new_fee;
    long h_affected;
    EXEC SQL END DECLARE SECTION;

    char merch[16], key[16];
    long orig = 0, cancel = 0, std_bp = 0, remain, new_fee, fee_refund, orig_fee;
    int  applied = 0, has_key;

    tx_log(TX_LOG_INFO, "[ST_OL_0027] 부분취소 정산 반영 진입");

    if (tx_buf_get(ctx->in, "MERCHID", merch, sizeof(merch)) != TX_OK) {
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }
    has_key = (tx_buf_get(ctx->in, "KEY", key, sizeof(key)) == TX_OK);
    tx_buf_getlong(ctx->in, "ORIG", &orig);
    tx_buf_getlong(ctx->in, "CANCEL", &cancel);
    tx_buf_getlong(ctx->in, "STDBP", &std_bp);
    if (std_bp <= 0) std_bp = 180;

    /* KEY 지정 시 원장 원금 조회 */
    if (has_key && orig <= 0) {
        strncpy(h_key, key, sizeof(h_key) - 1);
        h_key[sizeof(h_key) - 1] = '\0';
        h_orig = 0;
        EXEC SQL SELECT amount
            INTO :h_orig
            FROM st_ledger
            WHERE key = :h_key;
        if (sqlca.sqlcode == TX_SQL_OK)
            orig = h_orig;
        else if (sqlca.sqlcode != TX_SQL_NOTFOUND)
            TX_DBIO_LOG_ERR("SELECT st_ledger 부분취소");
    }

    if (orig <= 0 || cancel < 0 || cancel > orig) {
        tx_log(TX_LOG_WARN, "[ST_OL_0027] 취소금액 오류 orig=%ld cancel=%ld", orig, cancel);
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_INVALID);
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }

    remain     = orig - cancel;
    orig_fee   = st_fee_round(orig, std_bp);
    new_fee    = st_fee_round(remain, std_bp);
    fee_refund = orig_fee - new_fee;

    /* 원장 잔여금액/수수료 반영 */
    if (has_key) {
        strncpy(h_key, key, sizeof(h_key) - 1);
        h_key[sizeof(h_key) - 1] = '\0';
        h_remain  = remain;
        h_new_fee = new_fee;
        if (tx_begin() != TX_OK)
            tx_log(TX_LOG_WARN, "[ST_OL_0027] tx_begin 경고");
        EXEC SQL UPDATE st_ledger
            SET amount = :h_remain, fee = :h_new_fee, upd_ts = now()
            WHERE key = :h_key;
        if (sqlca.sqlcode != TX_SQL_OK) {
            TX_DBIO_LOG_ERR("UPDATE st_ledger 부분취소");
            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, "MERCHID", merch);
    tx_buf_setlong(ctx->out, "ORIG", orig);
    tx_buf_setlong(ctx->out, "REMAIN", remain);
    tx_buf_setlong(ctx->out, "NEWFEE", new_fee);
    tx_buf_setlong(ctx->out, "FEEREFUND", fee_refund);
    tx_buf_sets(ctx->out, "APPLIED", applied ? "Y" : "N");
    tx_log(TX_LOG_INFO, "[ST_OL_0027] 부분취소 orig=%ld cancel=%ld 잔여=%ld 수수료환급=%ld apply=%s",
           orig, cancel, remain, fee_refund, applied ? "Y" : "N");
    tx_return(ctx, TX_OK, ctx->out);
}