/* @tier medium @module lg @transform ledger-online */
/*
 * lg_ol_0016.pgc - 원장 온라인 서비스 (LG_OL_0016)  [tier=medium]
 *
 * 원장 역분개(逆分介): 원거래(KEY)를 조회해 동일 가맹점/카드/영업일로
 * 부호를 반대로 뒤집은(amount, fee 부호 반전) 새 역분개 원장행을
 * 생성한다. 역분개 키는 원거래 키에 'R' 접미를 붙여 구성하며 상태는
 * 처리완료(status='M')로 기표한다. 원거래 취소/상계 처리에 쓰인다.
 *
 * TxCore TX_SERVICE 엔트리. 요청 TXBUF 를 검증하고 lg_ledger 에
 * 직접 임베디드 SQL(SELECT/INSERT) 을 수행한 뒤 응답을 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_0016, ctx)
{
    EXEC SQL BEGIN DECLARE SECTION;
    char h_key[16];
    char h_rev_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], revkey[16];
    int  n;

    tx_log(TX_LOG_INFO, "[LG_OL_0016] 원장 역분개 서비스 진입");

    /* ---- 1. 요청 필드 수신 및 검증 ---- */
    if (tx_buf_get(ctx->in, "KEY", key, sizeof(key)) != TX_OK || key[0] == '\0') {
        tx_log(TX_LOG_ERROR, "[LG_OL_0016] KEY 누락");
        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. 원거래 조회 ---- */
    EXEC SQL SELECT merch_id, card_no, amount, biz_date, fee
        INTO :h_merch_id, :h_card_no, :h_amount, :h_biz_date, :h_fee
        FROM lg_ledger
        WHERE key = :h_key;

    if (sqlca.sqlcode == TX_SQL_NOTFOUND) {
        tx_log(TX_LOG_WARN, "[LG_OL_0016] 원거래 없음 key=%s", key);
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_INVALID);
        tx_return(ctx, TX_ENOENT, ctx->out);
        return;
    }
    if (sqlca.sqlcode != TX_SQL_OK) {
        TX_DBIO_LOG_ERR("LG_OL_0016 select");
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_SYSERR);
        tx_return(ctx, TX_EDB, ctx->out);
        return;
    }

    /* ---- 3. 역분개 키 구성 (원키[최대14] + 'R') ---- */
    n = (int)strlen(key);
    if (n > (int)sizeof(revkey) - 2)
        n = (int)sizeof(revkey) - 2;
    memcpy(revkey, key, n);
    revkey[n]     = 'R';
    revkey[n + 1] = '\0';

    strncpy(h_rev_key, revkey, sizeof(h_rev_key) - 1);
    h_rev_key[sizeof(h_rev_key) - 1] = '\0';

    /* ---- 4. 역분개 키 중복 확인 ---- */
    EXEC SQL SELECT count(*)
        INTO :h_dup
        FROM lg_ledger
        WHERE key = :h_rev_key;

    if (sqlca.sqlcode != TX_SQL_OK && sqlca.sqlcode != TX_SQL_NOTFOUND) {
        TX_DBIO_LOG_ERR("LG_OL_0016 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_0016] 이미 역분개됨 revkey=%s", revkey);
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_INVALID);
        tx_buf_sets(ctx->out, "REVKEY", revkey);
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }

    /* ---- 5. 부호 반전 후 역분개행 INSERT ---- */
    h_amount = -h_amount;
    h_fee    = -h_fee;
    strncpy(h_status, LG_ST_DONE, sizeof(h_status) - 1);
    h_status[sizeof(h_status) - 1] = '\0';

    if (tx_begin() != TX_OK) {
        tx_log(TX_LOG_ERROR, "[LG_OL_0016] 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_rev_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_0016 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_0016] 커밋 실패 revkey=%s", revkey);
        tx_abort();
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_SYSERR);
        tx_return(ctx, TX_FAIL, ctx->out);
        return;
    }

    /* ---- 6. 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, "REVKEY", revkey);
    tx_buf_setlong(ctx->out, "REVAMT", h_amount);
    tx_buf_setlong(ctx->out, "REVFEE", h_fee);
    tx_buf_sets(ctx->out, "STATUS", LG_ST_DONE);

    tx_log(TX_LOG_INFO, "[LG_OL_0016] 역분개 완료 원키=%s 역키=%s 역금액=%ld",
           key, revkey, h_amount);
    tx_return(ctx, TX_OK, ctx->out);
}
