/* @tier easy @module lg @transform ledger-online */
/*
 * lg_ol_0006.pgc - 원장 온라인 서비스 (LG_OL_0006)  [tier=easy]
 *
 * 원장 정정: 단건 원장(KEY)의 금액/수수료를 정정한다. 기존 행을
 * 먼저 조회해 정정 전 금액을 확보한 뒤, 요청받은 새 금액(AMOUNT)과
 * 재산정 수수료로 UPDATE 하고 정정 전/후 금액을 응답한다.
 *
 * TxCore TX_SERVICE 엔트리. 요청 TXBUF 를 검증하고 lg_ledger 에
 * 직접 임베디드 SQL 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_0006, ctx)
{
    EXEC SQL BEGIN DECLARE SECTION;
    char h_key[16];
    long h_old_amount;
    long h_old_fee;
    long h_new_amount;
    long h_new_fee;
    EXEC SQL END DECLARE SECTION;

    char key[16];
    long new_amount = 0;

    tx_log(TX_LOG_INFO, "[LG_OL_0006] 원장 정정 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_0006] KEY 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_getlong(ctx->in, "AMOUNT", &new_amount) != TX_OK ||
        !amount_is_valid(new_amount)) {
        tx_log(TX_LOG_WARN, "[LG_OL_0006] 정정금액 오류 amount=%ld", new_amount);
        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. 정정 대상 기존 행 조회 ---- */
    EXEC SQL SELECT amount, fee
        INTO :h_old_amount, :h_old_fee
        FROM lg_ledger
        WHERE key = :h_key;

    if (sqlca.sqlcode == TX_SQL_NOTFOUND) {
        tx_log(TX_LOG_WARN, "[LG_OL_0006] 정정 대상 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_0006 select");
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_SYSERR);
        tx_return(ctx, TX_EDB, ctx->out);
        return;
    }

    h_new_amount = new_amount;
    h_new_fee    = new_amount / 100;   /* 정정 수수료 재산정(1%) */

    tx_log(TX_LOG_INFO, "[LG_OL_0006] 정정 key=%s 금액 %ld→%ld 수수료 %ld→%ld",
           key, h_old_amount, h_new_amount, h_old_fee, h_new_fee);

    /* ---- 3. 트랜잭션 시작 → 금액/수수료 정정 ---- */
    if (tx_begin() != TX_OK) {
        tx_log(TX_LOG_ERROR, "[LG_OL_0006] 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 UPDATE lg_ledger
        SET amount = :h_new_amount, fee = :h_new_fee, upd_ts = now()
        WHERE key = :h_key;

    if (sqlca.sqlcode != TX_SQL_OK) {
        TX_DBIO_LOG_ERR("LG_OL_0006 update");
        tx_abort();
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_SYSERR);
        tx_return(ctx, TX_EDB, ctx->out);
        return;
    }
    if (sqlca.sqlerrd[2] == 0) {
        tx_log(TX_LOG_WARN, "[LG_OL_0006] 정정 반영 0건 key=%s", key);
        tx_abort();
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_INVALID);
        tx_return(ctx, TX_ENOENT, ctx->out);
        return;
    }

    if (tx_commit() != TX_OK) {
        tx_log(TX_LOG_ERROR, "[LG_OL_0006] 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;
    }

    /* ---- 4. 정정 전/후 응답 구성 ---- */
    tx_buf_reset(ctx->out);
    tx_buf_sets(ctx->out, "RESPCODE", RESP_OK);
    tx_buf_sets(ctx->out, "KEY", key);
    tx_buf_setlong(ctx->out, "OLDAMT", h_old_amount);
    tx_buf_setlong(ctx->out, "NEWAMT", h_new_amount);
    tx_buf_setlong(ctx->out, "OLDFEE", h_old_fee);
    tx_buf_setlong(ctx->out, "NEWFEE", h_new_fee);

    tx_log(TX_LOG_INFO, "[LG_OL_0006] 원장 정정 완료 key=%s", key);
    tx_return(ctx, TX_OK, ctx->out);
}
