/* @tier medium @module mg @transform msg-gateway-online */
/*
 * mg_ol_0019.pgc - 전문게이트웨이 공통헤더 파싱 서비스 (MG_OL_0019)  [tier=medium]
 *
 * 표준 고정 공통헤더를 원시전문(RAWMSG)에서 오프셋 단위로 파싱한다.
 * 공통헤더 레이아웃(총 25바이트):
 *   [전문길이 5][전문종별 4][채널 2][일자 8][시각 6]
 * 각 필드의 형식(숫자/종별화이트리스트)을 검증하고, 선언된 전문길이와
 * 실제 본문길이의 일치 여부를 교차검증하여 헤더 필드들을 응답한다.
 */
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

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

EXEC SQL INCLUDE sqlca;

#define HDR_LEN      25
#define OFF_LEN       0
#define OFF_TYPE      5
#define OFF_CHAN      9
#define OFF_DATE     11
#define OFF_TIME     19

/* 지정 구간이 전부 숫자인지 검사 */
static int all_digit(const char *p, int n)
{
    int i;
    for (i = 0; i < n; i++)
        if (p[i] < '0' || p[i] > '9')
            return 0;
    return 1;
}

TX_SERVICE(MG_OL_0019, ctx)
{
    char raw[256];
    char declen[6];
    char mtype[5];
    char chan[3];
    char cdate[9];
    char ctime[7];
    int  rawlen;
    long decl_body;
    long real_body;

    tx_log(TX_LOG_INFO, "[MG_OL_0019] 공통헤더 파싱 서비스 진입");

    rawlen = tx_buf_get(ctx->in, "RAWMSG", raw, sizeof(raw));
    if (rawlen <= 0) {
        tx_log(TX_LOG_ERROR, "[MG_OL_0019] RAWMSG 누락");
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }
    rawlen = (int)strlen(raw);
    if (rawlen < HDR_LEN) {
        tx_log(TX_LOG_WARN, "[MG_OL_0019] 헤더 길이부족 len=%d", rawlen);
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_INVALID);
        tx_return(ctx, TX_FAIL, ctx->out);
        return;
    }

    /* 오프셋 파싱 */
    memset(declen, 0, sizeof(declen));
    memset(mtype, 0, sizeof(mtype));
    memset(chan, 0, sizeof(chan));
    memset(cdate, 0, sizeof(cdate));
    memset(ctime, 0, sizeof(ctime));
    memcpy(declen, raw + OFF_LEN,  5);
    memcpy(mtype,  raw + OFF_TYPE, 4);
    memcpy(chan,   raw + OFF_CHAN, 2);
    memcpy(cdate,  raw + OFF_DATE, 8);
    memcpy(ctime,  raw + OFF_TIME, 6);

    /* 형식 검증: 길이/일자/시각은 숫자, 종별은 화이트리스트 */
    if (!all_digit(declen, 5) || !all_digit(cdate, 8) || !all_digit(ctime, 6)) {
        tx_log(TX_LOG_WARN, "[MG_OL_0019] 숫자필드 형식 오류");
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_INVALID);
        tx_return(ctx, TX_FAIL, ctx->out);
        return;
    }
    if (strcmp(mtype, MSG_TYPE_RECV) != 0 &&
        strcmp(mtype, MSG_TYPE_RESP) != 0 &&
        strcmp(mtype, MSG_TYPE_RECON) != 0) {
        tx_log(TX_LOG_WARN, "[MG_OL_0019] 전문종별 미허용 type=%s", mtype);
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_INVALID);
        tx_return(ctx, TX_FAIL, ctx->out);
        return;
    }
    if (!date_is_valid(cdate)) {
        tx_log(TX_LOG_WARN, "[MG_OL_0019] 일자 유효성 오류 date=%s", cdate);
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_INVALID);
        tx_return(ctx, TX_FAIL, ctx->out);
        return;
    }

    /* 선언 전문길이와 실제 본문길이 교차검증 */
    decl_body = (long)atoi(declen);
    real_body = (long)(rawlen - HDR_LEN);
    if (decl_body != real_body)
        tx_log(TX_LOG_WARN, "[MG_OL_0019] 길이불일치 decl=%ld real=%ld",
               decl_body, real_body);

    tx_buf_reset(ctx->out);
    tx_buf_sets(ctx->out, "RESPCODE", RESP_OK);
    tx_buf_sets(ctx->out, "MSGTYPE", mtype);
    tx_buf_sets(ctx->out, "CHAN", chan);
    tx_buf_sets(ctx->out, "TXNDATE", cdate);
    tx_buf_sets(ctx->out, "TXNTIME", ctime);
    tx_buf_setlong(ctx->out, "DECLLEN", decl_body);
    tx_buf_setlong(ctx->out, "REALLEN", real_body);
    tx_buf_sets(ctx->out, "LENMATCH", (decl_body == real_body) ? "Y" : "N");

    /* 공통헤더 파싱 이력(mg_hdr_log)을 임베디드 SQL 로 적재 */
    {
        EXEC SQL BEGIN DECLARE SECTION;
        char h_hl_type[8];
        char h_hl_chan[4];
        long h_hl_decl;
        long h_hl_real;
        EXEC SQL END DECLARE SECTION;

        strncpy(h_hl_type, mtype, sizeof(h_hl_type) - 1);
        h_hl_type[sizeof(h_hl_type) - 1] = '\0';
        strncpy(h_hl_chan, chan, sizeof(h_hl_chan) - 1);
        h_hl_chan[sizeof(h_hl_chan) - 1] = '\0';
        h_hl_decl = decl_body;
        h_hl_real = real_body;

        if (tx_begin() == TX_OK) {
            EXEC SQL INSERT INTO mg_hdr_log
                (msg_type, chan, decl_len, real_len)
                VALUES (:h_hl_type, :h_hl_chan, :h_hl_decl, :h_hl_real);
            if (sqlca.sqlcode != TX_SQL_OK) {
                TX_DBIO_LOG_ERR("INSERT mg_hdr_log");
                tx_abort();
            } else {
                tx_commit();
            }
        }
    }

    tx_log(TX_LOG_INFO, "[MG_OL_0019] 헤더파싱 완료 type=%s chan=%s date=%s time=%s",
           mtype, chan, cdate, ctime);
    tx_return(ctx, TX_OK, ctx->out);
}