/* @tier medium @module mg @transform msg-gateway-online */
/*
 * mg_ol_0009.pgc - 재전송 요청 처리 서비스 (MG_OL_0009)  [tier=medium]
 *
 * 처리키(KEY)로 원장을 조회하여 현재 상태로 재전송 가능여부를 판정한다.
 * 실패('U')/접수('R') 상태만 재전송 가능하며, 가능 시 재전송 큐(mg_queue)에
 * EXEC SQL 로 등록하고 큐 순번을 응답한다.
 */
#include <stdio.h>
#include <string.h>

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

EXEC SQL INCLUDE sqlca;

TX_SERVICE(MG_OL_0009, ctx)
{
    EXEC SQL BEGIN DECLARE SECTION;
    char h_key[16];
    char h_status[2];
    long h_amount;
    long h_seq;
    EXEC SQL END DECLARE SECTION;

    char     key[16];
    mg_rec_t rec;
    int      rc;
    int      resendable;

    tx_log(TX_LOG_INFO, "[MG_OL_0009] 재전송 요청 처리 서비스 진입");

    /* 1) 재전송 대상 처리키 수신 */
    if (tx_buf_get(ctx->in, "KEY", key, sizeof(key)) != TX_OK || key[0] == '\0') {
        tx_log(TX_LOG_ERROR, "[MG_OL_0009] 처리키(KEY) 누락");
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }

    /* 2) 원장 조회 */
    memset(&rec, 0, sizeof(rec));
    rc = mg_rec_select(key, &rec);
    if (rc == TX_ENOENT) {
        tx_log(TX_LOG_WARN, "[MG_OL_0009] 재전송 대상 없음 key=%s", key);
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESP", RESP_INVALID);
        tx_return(ctx, TX_ENOENT, ctx->out);
        return;
    }
    if (rc != TX_OK) {
        tx_log(TX_LOG_ERROR, "[MG_OL_0009] 원장 조회 실패 key=%s rc=%d", key, rc);
        tx_return(ctx, rc, ctx->out);
        return;
    }

    /* 3) 상태 기반 재전송 가능여부 판정 */
    resendable = (strncmp(rec.status, MG_ST_FAIL, 1) == 0 ||
                  strncmp(rec.status, MG_ST_RECV, 1) == 0);
    if (!resendable) {
        tx_log(TX_LOG_WARN, "[MG_OL_0009] 재전송 불가 상태 key=%s status=%s",
               key, rec.status);
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESP", RESP_INVALID);
        tx_buf_sets(ctx->out, "STATUS", rec.status);
        tx_return(ctx, TX_FAIL, ctx->out);
        return;
    }

    /* 4) 재전송 큐 등록 */
    strncpy(h_key, rec.key, sizeof(h_key) - 1);   h_key[sizeof(h_key) - 1] = '\0';
    strncpy(h_status, rec.status, sizeof(h_status) - 1); h_status[sizeof(h_status) - 1] = '\0';
    h_amount = rec.amount;

    EXEC SQL INSERT INTO mg_queue
        (proc_key, prev_status, amount, enq_ts, retry_cnt)
        VALUES (:h_key, :h_status, :h_amount, now(), 0);

    if (sqlca.sqlcode != TX_SQL_OK) {
        TX_DBIO_LOG_ERR("MG_OL_0009 mg_queue insert");
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESP", RESP_SYSERR);
        tx_return(ctx, TX_EDB, ctx->out);
        return;
    }

    /* 5) 등록된 큐 순번 조회 */
    h_seq = 0;
    EXEC SQL SELECT COUNT(*) INTO :h_seq FROM mg_queue WHERE proc_key = :h_key;
    if (sqlca.sqlcode != TX_SQL_OK)
        h_seq = -1;

    /* 6) 재전송 접수 응답 */
    tx_buf_reset(ctx->out);
    tx_buf_sets(ctx->out, "RESP", RESP_OK);
    tx_buf_sets(ctx->out, "KEY", rec.key);
    tx_buf_setlong(ctx->out, "QSEQ", h_seq);
    tx_buf_setlong(ctx->out, "AMOUNT", rec.amount);
    tx_log(TX_LOG_INFO, "[MG_OL_0009] 재전송 큐 등록완료 key=%s qseq=%ld", rec.key, h_seq);
    tx_return(ctx, TX_OK, ctx->out);
}