/* @tier easy @module lg @transform ledger-online */
/*
 * lg_ol_0004.pgc - 원장 온라인 서비스 (LG_OL_0004)  [tier=easy]
 *
 * 정산원장 반영: 요청 영업일(BIZDATE)의 승인완료(status='M') 건을
 * 정산완료(status='S')로 전이한다. 전이 전 SUM(amount)/COUNT 로
 * 정산 대상 금액을 확정 조회한 뒤 UPDATE 하며, 정산 반영 건수와
 * 정산금액 합계를 응답한다.
 *
 * TxCore TX_SERVICE 엔트리. 요청 TXBUF 를 검증하고 lg_ledger 에
 * 직접 임베디드 SQL 을 수행한 뒤 응답 TXBUF 를 구성한다.
 */
#include <stdio.h>
#include <string.h>

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

EXEC SQL INCLUDE sqlca;

TX_SERVICE(LG_OL_0004, ctx)
{
    EXEC SQL BEGIN DECLARE SECTION;
    char h_biz_date[9];
    char h_st_done[2];
    char h_st_settled[2];
    long h_sum;
    int  h_cnt;
    EXEC SQL END DECLARE SECTION;

    char bizdate[16];
    long affected = 0;

    tx_log(TX_LOG_INFO, "[LG_OL_0004] 정산원장 반영 서비스 진입");

    /* ---- 1. 요청 필드 수신 및 검증 ---- */
    if (tx_buf_get(ctx->in, "BIZDATE", bizdate, sizeof(bizdate)) != TX_OK ||
        !date_is_valid(bizdate)) {
        tx_log(TX_LOG_ERROR, "[LG_OL_0004] BIZDATE 오류 date=%s", bizdate);
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_INVALID);
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }

    strncpy(h_biz_date, bizdate, sizeof(h_biz_date) - 1);
    h_biz_date[sizeof(h_biz_date) - 1] = '\0';
    strncpy(h_st_done, LG_ST_DONE, sizeof(h_st_done) - 1);
    h_st_done[sizeof(h_st_done) - 1] = '\0';
    strncpy(h_st_settled, LG_ST_SETTLED, sizeof(h_st_settled) - 1);
    h_st_settled[sizeof(h_st_settled) - 1] = '\0';

    /* ---- 2. 정산대상(M) 금액/건수 사전 집계 ---- */
    EXEC SQL SELECT coalesce(sum(amount), 0), count(*)
        INTO :h_sum, :h_cnt
        FROM lg_ledger
        WHERE biz_date = :h_biz_date
          AND status   = :h_st_done;

    if (sqlca.sqlcode != TX_SQL_OK && sqlca.sqlcode != TX_SQL_NOTFOUND) {
        TX_DBIO_LOG_ERR("LG_OL_0004 sum");
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_SYSERR);
        tx_return(ctx, TX_EDB, ctx->out);
        return;
    }

    tx_log(TX_LOG_INFO, "[LG_OL_0004] 정산대상 date=%s 건수=%d 금액=%ld",
           bizdate, h_cnt, h_sum);

    if (h_cnt == 0) {
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_OK);
        tx_buf_sets(ctx->out, "BIZDATE", bizdate);
        tx_buf_setlong(ctx->out, "SETTLED", 0);
        tx_buf_setlong(ctx->out, "SUMAMT", 0);
        tx_log(TX_LOG_INFO, "[LG_OL_0004] 정산대상 없음 date=%s", bizdate);
        tx_return(ctx, TX_OK, ctx->out);
        return;
    }

    /* ---- 3. 트랜잭션 시작 → 승인완료(M) → 정산완료(S) 전이 ---- */
    if (tx_begin() != TX_OK) {
        tx_log(TX_LOG_ERROR, "[LG_OL_0004] 트랜잭션 시작 실패");
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_SYSERR);
        tx_return(ctx, TX_FAIL, ctx->out);
        return;
    }

    EXEC SQL UPDATE lg_ledger
        SET status = :h_st_settled, upd_ts = now()
        WHERE biz_date = :h_biz_date
          AND status   = :h_st_done;

    if (sqlca.sqlcode != TX_SQL_OK) {
        TX_DBIO_LOG_ERR("LG_OL_0004 update");
        tx_abort();
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_SYSERR);
        tx_return(ctx, TX_EDB, ctx->out);
        return;
    }

    affected = (long)sqlca.sqlerrd[2];

    if (tx_commit() != TX_OK) {
        tx_log(TX_LOG_ERROR, "[LG_OL_0004] 커밋 실패 date=%s", bizdate);
        tx_abort();
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_SYSERR);
        tx_return(ctx, TX_FAIL, ctx->out);
        return;
    }

    /* ---- 4. 응답 구성 ---- */
    tx_buf_reset(ctx->out);
    tx_buf_sets(ctx->out, "RESPCODE", RESP_OK);
    tx_buf_sets(ctx->out, "BIZDATE", bizdate);
    tx_buf_setlong(ctx->out, "SETTLED", affected);
    tx_buf_setlong(ctx->out, "SUMAMT", h_sum);
    tx_buf_sets(ctx->out, "STATUS", LG_ST_SETTLED);

    tx_log(TX_LOG_INFO, "[LG_OL_0004] 정산원장 반영 완료 date=%s 정산=%ld건 금액=%ld",
           bizdate, affected, h_sum);
    tx_return(ctx, TX_OK, ctx->out);
}