/* @tier medium @module lg @transform ledger-online */
/*
 * lg_ol_0007.pgc - 원장 온라인 서비스 (LG_OL_0007)  [tier=medium]
 *
 * 대변(貸邊) 전표 생성: 요청 정보로 신규 원장 전표행을 생성한다.
 * 대변 전표는 금액을 양수(amount>0)로, 상태를 처리완료(status='M')
 * 로 기표하며, 수수료는 금액의 1%(amount/100)로 산정한다. 신규 키가
 * 이미 존재하면 중복으로 거부한다.
 *
 * TxCore TX_SERVICE 엔트리. 요청 TXBUF 를 검증하고 lg_ledger 에
 * 직접 임베디드 SQL(INSERT) 을 수행한 뒤 응답 TXBUF 를 구성한다.
 */
#include <stdio.h>
#include <string.h>

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

EXEC SQL INCLUDE sqlca;

TX_SERVICE(LG_OL_0007, ctx)
{
    EXEC SQL BEGIN DECLARE SECTION;
    char h_key[16];
    char h_merch_id[16];
    char h_card_no[20];
    long h_amount;
    char h_biz_date[9];
    char h_status[2];
    long h_fee;
    int  h_dup;
    EXEC SQL END DECLARE SECTION;

    char key[16], merch[16], bizdate[16], cardno[20];
    long amount = 0;

    tx_log(TX_LOG_INFO, "[LG_OL_0007] 대변 전표생성 서비스 진입");

    /* ---- 1. 요청 필드 수신 및 검증 ---- */
    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, "BIZDATE", bizdate, sizeof(bizdate)) != TX_OK) {
        tx_log(TX_LOG_ERROR, "[LG_OL_0007] 필수 필드 누락");
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_INVALID);
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }
    if (tx_buf_get(ctx->in, "CARDNO", cardno, sizeof(cardno)) != TX_OK)
        cardno[0] = '\0';
    tx_buf_getlong(ctx->in, "AMOUNT", &amount);

    /* 대변 전표는 반드시 양수 금액 */
    if (!amount_is_valid(amount) || amount <= 0) {
        tx_log(TX_LOG_WARN, "[LG_OL_0007] 대변금액 오류 amount=%ld", amount);
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_INVALID);
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }
    if (!date_is_valid(bizdate)) {
        tx_log(TX_LOG_WARN, "[LG_OL_0007] 영업일 오류 date=%s", bizdate);
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_INVALID);
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }

    strncpy(h_key, key, sizeof(h_key) - 1);
    h_key[sizeof(h_key) - 1] = '\0';

    /* ---- 2. 신규 키 중복 확인 ---- */
    EXEC SQL SELECT count(*)
        INTO :h_dup
        FROM lg_ledger
        WHERE key = :h_key;

    if (sqlca.sqlcode != TX_SQL_OK && sqlca.sqlcode != TX_SQL_NOTFOUND) {
        TX_DBIO_LOG_ERR("LG_OL_0007 dupchk");
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_SYSERR);
        tx_return(ctx, TX_EDB, ctx->out);
        return;
    }
    if (h_dup > 0) {
        tx_log(TX_LOG_WARN, "[LG_OL_0007] 전표키 중복 key=%s", key);
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_INVALID);
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }

    /* ---- 3. 호스트 변수 채우기 (대변: amount>0, status='M') ---- */
    strncpy(h_merch_id, merch, sizeof(h_merch_id) - 1);
    h_merch_id[sizeof(h_merch_id) - 1] = '\0';
    strncpy(h_card_no, cardno, 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, LG_ST_DONE, sizeof(h_status) - 1);
    h_status[sizeof(h_status) - 1] = '\0';
    h_amount = amount;
    h_fee    = amount / 100;

    /* ---- 4. 트랜잭션 시작 → 대변 전표 INSERT ---- */
    if (tx_begin() != TX_OK) {
        tx_log(TX_LOG_ERROR, "[LG_OL_0007] 트랜잭션 시작 실패");
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_SYSERR);
        tx_return(ctx, TX_FAIL, ctx->out);
        return;
    }

    EXEC SQL INSERT INTO lg_ledger
        (key, merch_id, card_no, amount, biz_date, status, fee, upd_ts)
        VALUES
        (:h_key, :h_merch_id, :h_card_no, :h_amount, :h_biz_date,
         :h_status, :h_fee, now());

    if (sqlca.sqlcode != TX_SQL_OK) {
        TX_DBIO_LOG_ERR("LG_OL_0007 insert");
        tx_abort();
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_SYSERR);
        tx_return(ctx, TX_EDB, ctx->out);
        return;
    }

    if (tx_commit() != TX_OK) {
        tx_log(TX_LOG_ERROR, "[LG_OL_0007] 커밋 실패 key=%s", key);
        tx_abort();
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_SYSERR);
        tx_return(ctx, TX_FAIL, ctx->out);
        return;
    }

    /* ---- 5. 응답 구성 ---- */
    tx_buf_reset(ctx->out);
    tx_buf_sets(ctx->out, "RESPCODE", RESP_OK);
    tx_buf_sets(ctx->out, "KEY", key);
    tx_buf_sets(ctx->out, "DRCR", "CR");            /* 대변 표시 */
    tx_buf_setlong(ctx->out, "AMOUNT", h_amount);
    tx_buf_setlong(ctx->out, "FEE", h_fee);
    tx_buf_sets(ctx->out, "STATUS", LG_ST_DONE);

    tx_log(TX_LOG_INFO, "[LG_OL_0007] 대변 전표생성 완료 key=%s 금액=%ld",
           key, h_amount);
    tx_return(ctx, TX_OK, ctx->out);
}