/* @tier hard @module au @transform authorization-online */
/*
 * au_ol_0009.pgc - 대행승인 fallback(주센터 실패시 백업) (AU_OL_0009)  [tier=hard]
 *
 * 주센터(au_center) 가동상태를 임베디드 SQL 로 확인해 정상이면 주센터
 * (AU_ISSUER)로, 장애면 곧바로 대행센터(AU_STANDIN)로 tx_call 한다.
 * 주센터 tx_call 이 실패해도 대행센터로 전환하며, 대행 처리분은
 * 대행승인 이력(au_standin_log)에 기록한다.
 */
#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_0009, ctx)
{
    EXEC SQL BEGIN DECLARE SECTION;
    char h_center_id[8];
    char h_center_status[2];
    char h_key[16];
    long h_amount;
    EXEC SQL END DECLARE SECTION;

    TXBUF *req;
    char key[16];
    long amount = 0;
    int  rc, standin = 0, primary_down;

    tx_log(TX_LOG_INFO, "[AU_OL_0009] 대행승인 fallback 진입");

    if (tx_buf_get(ctx->in, "KEY", key, sizeof(key)) != TX_OK) {
        tx_log(TX_LOG_ERROR, "[AU_OL_0009] KEY 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';
    h_amount = amount;

    /* 주센터 가동상태 조회 (center_id='PRIMARY') */
    strcpy(h_center_id, "PRIMARY");
    strcpy(h_center_status, "U");
    EXEC SQL SELECT center_status
        INTO :h_center_status
        FROM au_center
        WHERE center_id = :h_center_id;
    if (sqlca.sqlcode != TX_SQL_OK && sqlca.sqlcode != TX_SQL_NOTFOUND) {
        TX_DBIO_LOG_ERR("SELECT au_center");
        tx_return(ctx, TX_EDB, ctx->out);
        return;
    }
    /* 상태 'U'(Up)=정상, 그 외는 장애로 간주 */
    primary_down = (strncmp(h_center_status, "U", 1) != 0);

    req = tx_buf_alloc();
    if (!req) {
        tx_return(ctx, TX_ENOMEM, ctx->out);
        return;
    }
    tx_buf_sets(req, "KEY", key);
    tx_buf_setlong(req, "AMOUNT", amount);

    if (!primary_down) {
        rc = tx_call("AU_ISSUER", req, ctx->out);
        if (rc != TX_OK) {
            tx_log(TX_LOG_WARN, "[AU_OL_0009] 주센터 응답실패 rc=%d, 대행 전환", rc);
            primary_down = 1;
        }
    } else {
        rc = TX_FAIL;
        tx_log(TX_LOG_WARN, "[AU_OL_0009] 주센터 장애(status=%s), 대행 전환",
               h_center_status);
    }

    if (primary_down) {
        tx_buf_reset(ctx->out);
        rc = tx_call("AU_STANDIN", req, ctx->out);
        standin = (rc == TX_OK);
    }
    tx_buf_free(req);

    if (rc != TX_OK) {
        tx_log(TX_LOG_ERROR, "[AU_OL_0009] 대행승인까지 실패 rc=%d", rc);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_SYSERR);
        tx_return(ctx, rc, ctx->out);
        return;
    }

    tx_buf_sets(ctx->out, "STANDIN", standin ? "Y" : "N");

    /* 대행 처리분은 이력에 기록 */
    if (standin) {
        if (tx_begin() != TX_OK)
            tx_log(TX_LOG_WARN, "[AU_OL_0009] tx_begin 경고");
        EXEC SQL INSERT INTO au_standin_log
            (req_key, req_amount, center_status)
            VALUES
            (:h_key, :h_amount, :h_center_status);
        if (sqlca.sqlcode != TX_SQL_OK) {
            TX_DBIO_LOG_ERR("INSERT au_standin_log");
            tx_abort();
        } else {
            tx_commit();
        }
    }

    tx_log(TX_LOG_INFO, "[AU_OL_0009] fallback 처리완료 key=%s standin=%s",
           key, standin ? "Y" : "N");
    tx_return(ctx, TX_OK, ctx->out);
}