/* @tier easy @module vl @transform validation-online */
/*
 * vl_ol_0007.pgc - 금액 tolerance 정합 검증 서비스 (VL_OL_0007)
 *
 * 원장(vl_rec_select) 의 거래금액과 승인원천(vl_authorized) 의 승인금액을
 * 대사한다. 입력 허용오차(TOL, 기본 0원) 이내면 정합, 초과하면 불일치(VL07xx).
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

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

EXEC SQL INCLUDE sqlca;

TX_SERVICE(VL_OL_0007, ctx)
{
    EXEC SQL BEGIN DECLARE SECTION;
    char h_key[16];
    long h_appr_amt;
    EXEC SQL END DECLARE SECTION;

    vl_rec_t rec;
    char key[16];
    long tol = 0, diff, absdiff;
    int  rc;

    tx_log(TX_LOG_INFO, "[VL_OL_0007] 금액 tolerance 검증 서비스 진입");

    if (tx_buf_get(ctx->in, "KEY", key, sizeof(key)) != TX_OK) {
        tx_log(TX_LOG_ERROR, "[VL_OL_0007] KEY 누락");
        tx_buf_sets(ctx->out, "ERRCODE", "VL0700");
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }
    tx_buf_getlong(ctx->in, "TOL", &tol);
    if (tol < 0)
        tol = 0;

    /* 1) 원장 금액 확보 */
    memset(&rec, 0, sizeof(rec));
    rc = vl_rec_select(key, &rec);
    if (rc != TX_OK) {
        tx_log(TX_LOG_WARN, "[VL_OL_0007] 원장 조회 실패 key=%s rc=%d", key, rc);
        tx_buf_sets(ctx->out, "ERRCODE", "VL0701");
        tx_return(ctx, rc, ctx->out);
        return;
    }

    /* 2) 승인금액 조회 */
    strncpy(h_key, key, sizeof(h_key) - 1);
    h_key[sizeof(h_key) - 1] = '\0';
    h_appr_amt = 0;

    EXEC SQL SELECT approval_amount
          INTO :h_appr_amt
          FROM vl_authorized
         WHERE txn_key = :h_key;

    if (sqlca.sqlcode == TX_SQL_NOTFOUND) {
        tx_log(TX_LOG_WARN, "[VL_OL_0007] 승인원천 없음 key=%s", key);
        tx_buf_sets(ctx->out, "RESULT", "MISMATCH");
        tx_buf_sets(ctx->out, "ERRCODE", "VL0702");
        tx_return(ctx, TX_ENOENT, ctx->out);
        return;
    }
    if (sqlca.sqlcode != TX_SQL_OK) {
        TX_DBIO_LOG_ERR("SELECT vl_authorized");
        tx_buf_sets(ctx->out, "ERRCODE", "VL0709");
        tx_return(ctx, TX_EDB, ctx->out);
        return;
    }

    /* 3) 허용오차 판정 */
    diff = rec.amount - h_appr_amt;
    absdiff = labs(diff);

    tx_buf_reset(ctx->out);
    tx_buf_sets(ctx->out, "KEY", key);
    tx_buf_setlong(ctx->out, "LEDGERAMT", rec.amount);
    tx_buf_setlong(ctx->out, "APPRAMT", h_appr_amt);
    tx_buf_setlong(ctx->out, "DIFF", diff);
    tx_buf_setlong(ctx->out, "TOL", tol);

    if (absdiff > tol) {
        tx_log(TX_LOG_WARN, "[VL_OL_0007] 허용오차 초과 key=%s diff=%ld tol=%ld",
               key, diff, tol);
        tx_buf_sets(ctx->out, "RESULT", "MISMATCH");
        tx_buf_sets(ctx->out, "ERRCODE", "VL0703");
        tx_return(ctx, TX_OK, ctx->out);
        return;
    }

    tx_buf_sets(ctx->out, "RESULT", "MATCH");
    tx_buf_sets(ctx->out, "ERRCODE", RESP_OK);
    tx_log(TX_LOG_INFO, "[VL_OL_0007] 금액 정합 key=%s diff=%ld", key, diff);
    tx_return(ctx, TX_OK, ctx->out);
}