/* @tier hard @module ac @transform acquire-online */
/*
 * ac_ol_0028.pgc - 매입 온라인 서비스 (AC_OL_0028)  [tier=hard]
 *
 * 매입 세금계산서 발행집계: 지정 영업일의 완료(status='M') 매입 원장을
 * 가맹점별로 그룹핑하여 매입 합계금액을 공급가액으로, 그 10%를 부가세로
 * 산정한 세금계산서(tax_invoice)를 가맹점 단위로 1건씩 발행/적재한다.
 * 전 가맹점을 하나의 트랜잭션으로 묶어 처리하며, DB 오류 발생 시 전체
 * 롤백한다.
 */
#include <stdio.h>
#include <string.h>

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

EXEC SQL INCLUDE sqlca;

TX_SERVICE(AC_OL_0028, ctx)
{
    /* ---- ECPG 호스트 변수 선언부 ---- */
    EXEC SQL BEGIN DECLARE SECTION;
    char h_biz_date[9];
    char h_status_done[2];
    char h_merch_id[16];
    long h_supply;
    char h_tax_no[32];
    long h_vat;
    EXEC SQL END DECLARE SECTION;

    char bizdate[9];
    long merch_cnt  = 0;
    long tot_supply = 0;
    long tot_vat    = 0;
    long dberr      = 0;

    tx_log(TX_LOG_INFO, "[AC_OL_0028] 매입 세금계산서 발행집계 서비스 진입");

    /* ---- 1. 입력 검증 ---- */
    if (tx_buf_get(ctx->in, "BIZDATE", bizdate, sizeof(bizdate)) != TX_OK ||
        !date_is_valid(bizdate)) {
        tx_log(TX_LOG_ERROR, "[AC_OL_0028] BIZDATE 누락/오류");
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_INVALID);
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }

    memset(h_biz_date, 0, sizeof(h_biz_date));
    strncpy(h_biz_date, bizdate, sizeof(h_biz_date) - 1);
    strncpy(h_status_done, AC_ST_DONE, sizeof(h_status_done) - 1);
    h_status_done[sizeof(h_status_done) - 1] = '\0';

    /* ---- 2. 트랜잭션 시작 ---- */
    if (tx_begin() != TX_OK) {
        tx_log(TX_LOG_ERROR, "[AC_OL_0028] 트랜잭션 시작 실패");
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_SYSERR);
        tx_return(ctx, TX_FAIL, ctx->out);
        return;
    }

    /* ---- 3. 가맹점별 매입합계 그룹핑 커서 ---- */
    EXEC SQL DECLARE cur_ac_ol_0028 CURSOR FOR
        SELECT merch_id, SUM(amount)
          FROM ac_ledger
         WHERE biz_date = :h_biz_date
           AND status    = :h_status_done
         GROUP BY merch_id
         ORDER BY merch_id;

    EXEC SQL OPEN cur_ac_ol_0028;
    if (sqlca.sqlcode != TX_SQL_OK) {
        TX_DBIO_LOG_ERR("cur_ac_ol_0028 open");
        tx_abort();
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_SYSERR);
        tx_return(ctx, TX_EDB, ctx->out);
        return;
    }

    /* ---- 4. 가맹점 순회: 세금계산서 발행 ---- */
    for (;;) {
        EXEC SQL FETCH cur_ac_ol_0028 INTO :h_merch_id, :h_supply;

        if (sqlca.sqlcode == TX_SQL_NOTFOUND)
            break;
        if (sqlca.sqlcode != TX_SQL_OK) {
            TX_DBIO_LOG_ERR("cur_ac_ol_0028 fetch");
            dberr++;
            break;
        }

        /* 업무규칙: 매입 합계금액을 공급가액으로 보고 부가세 10% 산정 */
        h_vat = h_supply / 10;

        memset(h_tax_no, 0, sizeof(h_tax_no));
        snprintf(h_tax_no, sizeof(h_tax_no), "%s%s", h_biz_date, h_merch_id);

        EXEC SQL
            INSERT INTO tax_invoice (tax_no, merch_id, biz_date, supply_amt, vat_amt)
            VALUES (:h_tax_no, :h_merch_id, :h_biz_date, :h_supply, :h_vat);

        if (sqlca.sqlcode != TX_SQL_OK) {
            TX_DBIO_LOG_ERR("cur_ac_ol_0028 insert tax_invoice");
            dberr++;
            break;
        }

        merch_cnt++;
        tot_supply += h_supply;
        tot_vat    += h_vat;
        tx_log(TX_LOG_DEBUG,
               "[AC_OL_0028] 발행 merch=%s 공급가액=%ld 부가세=%ld",
               h_merch_id, h_supply, h_vat);
    }

    EXEC SQL CLOSE cur_ac_ol_0028;

    /* ---- 5. 커밋/롤백 ---- */
    if (dberr > 0) {
        tx_log(TX_LOG_ERROR, "[AC_OL_0028] DB 오류로 전체 롤백 dberr=%ld", dberr);
        tx_abort();
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_SYSERR);
        tx_return(ctx, TX_EDB, ctx->out);
        return;
    }

    if (tx_commit() != TX_OK) {
        tx_log(TX_LOG_ERROR, "[AC_OL_0028] 커밋 실패");
        tx_abort();
        tx_buf_reset(ctx->out);
        tx_buf_sets(ctx->out, "RESPCODE", RESP_SYSERR);
        tx_return(ctx, TX_FAIL, ctx->out);
        return;
    }

    /* ---- 6. 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, "MERCHCNT", merch_cnt);
    tx_buf_setlong(ctx->out, "TOTSUPPLY", tot_supply);
    tx_buf_setlong(ctx->out, "TOTVAT", tot_vat);

    tx_log(TX_LOG_INFO,
           "[AC_OL_0028] 발행집계완료 date=%s 가맹점수=%ld 공급가액합계=%ld 부가세합계=%ld",
           bizdate, merch_cnt, tot_supply, tot_vat);
    tx_return(ctx, TX_OK, ctx->out);
}