/* @tier easy @module au @transform authorization-online */
/*
 * au_ol_0001.pgc - 승인한도 온라인 서비스 (AU_OL_0001)  [tier=easy]
 *
 * 처리키(KEY)로 승인원장을 조회하고, 해당 가맹점의 승인한도 마스터
 * (au_limit)에서 일한도/기사용액을 임베디드 SQL 로 읽어 가용한도
 * (avail = daily_limit - used_amt)를 산출해 함께 응답한다. (조회 전용)
 */
#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_0001, ctx)
{
    EXEC SQL BEGIN DECLARE SECTION;
    char h_merch_id[16];
    long h_daily_limit;
    long h_used_amt;
    EXEC SQL END DECLARE SECTION;

    au_rec_t rec;
    char key[16];
    char avail_won[32];
    long avail;
    int  rc;

    tx_log(TX_LOG_INFO, "[AU_OL_0001] 승인한도 단건조회 서비스 진입");

    if (tx_buf_get(ctx->in, "KEY", key, sizeof(key)) != TX_OK) {
        tx_log(TX_LOG_ERROR, "[AU_OL_0001] KEY 누락");
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }

    memset(&rec, 0, sizeof(rec));
    rc = au_rec_select(key, &rec);
    if (rc != TX_OK) {
        tx_log(TX_LOG_WARN, "[AU_OL_0001] 조회 실패 key=%s rc=%d(%s)",
               key, rc, tx_strerror(rc));
        tx_return(ctx, rc, ctx->out);
        return;
    }

    /* 가맹점 승인한도 마스터 조회 (임베디드 SQL) */
    strncpy(h_merch_id, rec.merch_id, sizeof(h_merch_id) - 1);
    h_merch_id[sizeof(h_merch_id) - 1] = '\0';
    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_NOTFOUND) {
        tx_log(TX_LOG_WARN, "[AU_OL_0001] 한도마스터 미등록 merch=%s", rec.merch_id);
    } else if (sqlca.sqlcode != TX_SQL_OK) {
        TX_DBIO_LOG_ERR("SELECT au_limit");
        tx_return(ctx, TX_EDB, ctx->out);
        return;
    }

    avail = h_daily_limit - h_used_amt;
    if (avail < 0)
        avail = 0;
    amount_format_won(avail, avail_won, sizeof(avail_won));

    tx_buf_reset(ctx->out);
    tx_buf_sets(ctx->out, "KEY", rec.key);
    tx_buf_sets(ctx->out, "MERCHID", rec.merch_id);
    tx_buf_setlong(ctx->out, "AMOUNT", rec.amount);
    tx_buf_sets(ctx->out, "STATUS", rec.status);
    tx_buf_setlong(ctx->out, "DAILYLIMIT", h_daily_limit);
    tx_buf_setlong(ctx->out, "USEDAMT", h_used_amt);
    tx_buf_setlong(ctx->out, "AVAIL", avail);
    tx_buf_sets(ctx->out, "AVAILWON", avail_won);

    tx_log(TX_LOG_INFO, "[AU_OL_0001] 조회완료 key=%s amount=%ld 가용한도=%ld",
           key, rec.amount, avail);
    tx_return(ctx, TX_OK, ctx->out);
}