/* @tier hard @module au @transform authorization-online */
/*
 * au_ol_0008.pgc - 승인요청 매입사 중계(tx_call) (AU_OL_0008)  [tier=hard]
 *
 * 요청 승인건에 대해 가맹점 승인한도(au_limit)를 임베디드 SQL 로 확인하고,
 * 승인요청 이력행(au_appr_req)을 적재한 뒤 매입사(AU_ISSUER)로 tx_call
 * 중계한다. 매입사 승인응답이 정상이면 가맹점 기사용액(used_amt)을 증액
 * 반영한다. 원장 반영은 하나의 트랜잭션으로 처리한다.
 */
#include <stdio.h>
#include <string.h>

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

EXEC SQL INCLUDE sqlca;

TX_SERVICE(AU_OL_0008, ctx)
{
    EXEC SQL BEGIN DECLARE SECTION;
    char h_key[16];
    char h_merch_id[16];
    char h_card_no[20];
    long h_amount;
    long h_daily_limit;
    long h_used_amt;
    EXEC SQL END DECLARE SECTION;

    TXBUF *req;
    char key[16], merch[16], card[20], resp[8];
    long amount = 0, avail;
    int  rc;

    tx_log(TX_LOG_INFO, "[AU_OL_0008] 승인요청 중계 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_log(TX_LOG_ERROR, "[AU_OL_0008] 필수 필드 누락");
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }
    tx_buf_getlong(ctx->in, "AMOUNT", &amount);

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

    /* 1) 가맹점 승인한도 확인 */
    h_daily_limit = 0;
    h_used_amt    = 0;
    EXEC SQL SELECT daily_limit, used_amt
        INTO :h_daily_limit, :h_used_amt
        FROM au_limit
        WHERE merch_id = :h_merch_id;
    if (sqlca.sqlcode != TX_SQL_OK && sqlca.sqlcode != TX_SQL_NOTFOUND) {
        TX_DBIO_LOG_ERR("SELECT au_limit");
        tx_return(ctx, TX_EDB, ctx->out);
        return;
    }
    avail = h_daily_limit - h_used_amt;
    if (h_daily_limit > 0 && amount > avail) {
        tx_log(TX_LOG_WARN, "[AU_OL_0008] 한도초과 merch=%s req=%ld avail=%ld",
               merch, amount, avail);
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_INVALID);
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }

    /* 2) 승인요청 이력행 적재 (요청상태 'Q') */
    if (tx_begin() != TX_OK) {
        tx_log(TX_LOG_ERROR, "[AU_OL_0008] 트랜잭션 시작 실패");
        tx_return(ctx, TX_FAIL, ctx->out);
        return;
    }
    EXEC SQL INSERT INTO au_appr_req
        (req_key, merch_id, card_no, req_amount, req_status)
        VALUES
        (:h_key, :h_merch_id, :h_card_no, :h_amount, 'Q');
    if (sqlca.sqlcode != TX_SQL_OK) {
        TX_DBIO_LOG_ERR("INSERT au_appr_req");
        tx_abort();
        tx_return(ctx, TX_EDB, ctx->out);
        return;
    }

    /* 3) 매입사 중계 (tx_call) */
    req = tx_buf_alloc();
    if (!req) {
        tx_abort();
        tx_return(ctx, TX_ENOMEM, ctx->out);
        return;
    }
    tx_buf_sets(req, "KEY", key);
    tx_buf_sets(req, "MERCHID", merch);
    tx_buf_sets(req, "CARDNO", card);
    tx_buf_setlong(req, "AMOUNT", amount);
    tx_buf_sets(req, "MTI", MSG_TYPE_RECV);

    rc = tx_call("AU_ISSUER", req, ctx->out);
    tx_buf_free(req);
    if (rc != TX_OK) {
        tx_log(TX_LOG_ERROR, "[AU_OL_0008] 매입사 중계 실패 rc=%d(%s)", rc, tx_strerror(rc));
        tx_abort();
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_SYSERR);
        tx_return(ctx, rc, ctx->out);
        return;
    }

    if (tx_buf_get(ctx->out, "RESPCODE", resp, sizeof(resp)) != TX_OK)
        strcpy(resp, RESP_OK);

    /* 4) 승인 성공 시 요청상태 완료 + 기사용액 증액 */
    EXEC SQL UPDATE au_appr_req
        SET req_status = 'A'
        WHERE req_key = :h_key;
    if (sqlca.sqlcode != TX_SQL_OK) {
        TX_DBIO_LOG_ERR("UPDATE au_appr_req");
        tx_abort();
        tx_return(ctx, TX_EDB, ctx->out);
        return;
    }

    EXEC SQL UPDATE au_limit
        SET used_amt = used_amt + :h_amount
        WHERE merch_id = :h_merch_id;
    if (sqlca.sqlcode != TX_SQL_OK) {
        TX_DBIO_LOG_ERR("UPDATE au_limit used_amt");
        tx_abort();
        tx_return(ctx, TX_EDB, ctx->out);
        return;
    }

    tx_commit();

    tx_log(TX_LOG_INFO, "[AU_OL_0008] 중계 응답 key=%s resp=%s used+=%ld",
           key, resp, amount);
    tx_return(ctx, TX_OK, ctx->out);
}