/* @tier hard @module ac @transform acquire-online */
/*
 * ac_ol_0008.pgc - 할부매입 서비스 (AC_OL_0008)  [tier=hard]
 *
 * 총 매입금액을 개월수(MONTHS, install_month>=2)로 분할하여 월별
 * ac_ledger 행(키: KEY-01..KEY-NN, acq_type='INST')을 순차 INSERT 한다.
 * 나머지 금액은 1회차에 몰아준다. 전 과정은 하나의 트랜잭션으로 처리.
 */
#include <stdio.h>
#include <string.h>

#include "txcore.h"
#include "txcore_dbio.h"
#include "acq_util.h"
#include "ac_core.h"

EXEC SQL INCLUDE sqlca;

TX_SERVICE(AC_OL_0008, ctx)
{
    EXEC SQL BEGIN DECLARE SECTION;
    char h_merch_id[16];
    char h_card_no[20];
    char h_biz_date[9];
    char h_status[2];
    char h_acq_type[4];
    char h_row_key[16];
    long h_row_amount;
    long h_row_fee;
    int  h_install_month;
    EXEC SQL END DECLARE SECTION;

    char key[16], merch[16], card[20], bizdate[16];
    char base_key[16];
    long amount = 0, months_l = 0;
    long monthly, remainder, row_amt, totalfee = 0;
    int  months, i, errcnt = 0;
    size_t klen;

    tx_log(TX_LOG_INFO, "[AC_OL_0008] 할부매입 서비스 진입");

    if (tx_buf_get(ctx->in, "KEY", key, sizeof(key)) != TX_OK ||
        tx_buf_get(ctx->in, "MERCHID", merch, sizeof(merch)) != TX_OK ||
        tx_buf_get(ctx->in, "CARDNO", card, sizeof(card)) != TX_OK ||
        tx_buf_get(ctx->in, "BIZDATE", bizdate, sizeof(bizdate)) != TX_OK) {
        tx_log(TX_LOG_ERROR, "[AC_OL_0008] 필수 필드 누락");
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }
    tx_buf_getlong(ctx->in, "AMOUNT", &amount);
    tx_buf_getlong(ctx->in, "MONTHS", &months_l);

    if (!amount_is_valid(amount) || !date_is_valid(bizdate)) {
        tx_log(TX_LOG_WARN, "[AC_OL_0008] 입력 검증 실패 amount=%ld date=%s",
               amount, bizdate);
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }
    if (months_l < 2) {
        tx_log(TX_LOG_WARN, "[AC_OL_0008] 할부개월 오류 months=%ld", months_l);
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }
    months = (int)months_l;

    monthly   = amount / months;
    remainder = amount - (monthly * months);

    /* 원거래키 앞부분 12자 + "-NN" (16바이트 한도 준수) */
    klen = strlen(key);
    if (klen > 12)
        klen = 12;
    memcpy(base_key, key, klen);
    base_key[klen] = '\0';

    strncpy(h_merch_id, merch, sizeof(h_merch_id) - 1);
    h_merch_id[sizeof(h_merch_id) - 1] = '\0';
    strncpy(h_card_no, card, sizeof(h_card_no) - 1);
    h_card_no[sizeof(h_card_no) - 1] = '\0';
    strncpy(h_biz_date, bizdate, sizeof(h_biz_date) - 1);
    h_biz_date[sizeof(h_biz_date) - 1] = '\0';
    strncpy(h_status, AC_ST_RECV, sizeof(h_status));
    strncpy(h_acq_type, "INST", sizeof(h_acq_type) - 1);
    h_acq_type[sizeof(h_acq_type) - 1] = '\0';

    if (tx_begin() != TX_OK)
        tx_log(TX_LOG_WARN, "[AC_OL_0008] tx_begin 경고");

    for (i = 1; i <= months; i++) {
        row_amt = (i == 1) ? (monthly + remainder) : monthly;

        snprintf(h_row_key, sizeof(h_row_key), "%s-%02d", base_key, i);
        h_row_amount    = row_amt;
        h_row_fee       = row_amt * 25 / 10000;   /* 할부 수수료 0.25% */
        h_install_month = i;

        EXEC SQL INSERT INTO ac_ledger
                (key, merch_id, card_no, amount, biz_date, status, fee,
                 acq_type, install_month)
            VALUES
                (:h_row_key, :h_merch_id, :h_card_no, :h_row_amount, :h_biz_date,
                 :h_status, :h_row_fee, :h_acq_type, :h_install_month);

        if (sqlca.sqlcode != TX_SQL_OK || sqlca.sqlerrd[2] != 1) {
            TX_DBIO_LOG_ERR("INSERT ac_ledger(할부회차)");
            errcnt++;
            break;
        }

        totalfee += h_row_fee;
    }

    if (errcnt > 0) {
        tx_abort();
        tx_return(ctx, TX_EDB, ctx->out);
        return;
    }

    tx_commit();

    tx_buf_reset(ctx->out);
    tx_buf_sets(ctx->out, "KEY", key);
    tx_buf_setlong(ctx->out, "MONTHCNT", months);
    tx_buf_setlong(ctx->out, "FIRSTAMT", monthly + remainder);
    tx_buf_setlong(ctx->out, "MONTHLYAMT", monthly);
    tx_buf_setlong(ctx->out, "TOTALFEE", totalfee);
    tx_log(TX_LOG_INFO,
           "[AC_OL_0008] 할부매입 완료 key=%s 총액=%ld 개월=%d 1회차=%ld 월분=%ld",
           key, amount, months, monthly + remainder, monthly);
    tx_return(ctx, TX_OK, ctx->out);
}