/* @tier hard @module st @transform settlement-online */
/*
 * st_ol_0013.pgc - 정산금 분할(N분할) 계산 (ST_OL_0013)  [tier=hard]
 *
 * 총 정산금을 N 회차로 균등 분할하되, 원단위 잔여(remainder)를 마지막
 * 회차에 몰아 합계가 원금과 일치하도록 배분한다.
 */
#include <stdio.h>
#include <string.h>

#include "txcore.h"
#include "acq_util.h"
#include "st_core.h"

EXEC SQL INCLUDE sqlca;


TX_SERVICE(ST_OL_0013, ctx)
{
    char merch[16];
    long total = 0, parts = 0, base_part, last_part, i, acc = 0;

    tx_log(TX_LOG_INFO, "[ST_OL_0013] 정산금 분할 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, "TOTAL", &total);
    tx_buf_getlong(ctx->in, "PARTS", &parts);

    if (total <= 0 || parts <= 0 || parts > 60) {
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_INVALID);
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }

    base_part = total / parts;
    for (i = 0; i < parts - 1; i++)
        acc += base_part;
    last_part = total - acc;            /* 잔여 마지막 회차 흡수 */

    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, "TOTAL", total);
    tx_buf_setlong(ctx->out, "PARTS", parts);
    tx_buf_setlong(ctx->out, "BASEPART", base_part);
    tx_buf_setlong(ctx->out, "LASTPART", last_part);
    tx_log(TX_LOG_INFO, "[ST_OL_0013] 분할 total=%ld parts=%ld base=%ld last=%ld",
           total, parts, base_part, last_part);
    tx_return(ctx, TX_OK, ctx->out);
}
