/* @tier easy @module ac @transform acquire-online */
/*
 * ac_ol_0007.pgc - 부분매입 서비스 (AC_OL_0007)  [tier=easy]
 *
 * 원거래 금액 중 일부(CAPAMT)만 매입 처리한다. 원장의 잔여금액을 차감
 * 갱신하고, 부분매입 내역행(acq_type='PART', orig_key 연결)을 별도 적재
 * 한 뒤 남은 잔여금액을 반환한다.
 */
#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_0007, ctx)
{
    EXEC SQL BEGIN DECLARE SECTION;
    char h_key[16];
    long h_orig_amount;
    char h_merch_id[16];
    char h_card_no[20];
    char h_biz_date[9];
    long h_cap_amount;
    long h_remaining;
    char h_part_key[16];
    char h_status[2];
    EXEC SQL END DECLARE SECTION;

    char key[16];
    long capamt = 0;
    size_t klen;

    tx_log(TX_LOG_INFO, "[AC_OL_0007] 부분매입 서비스 진입");

    if (tx_buf_get(ctx->in, "KEY", key, sizeof(key)) != TX_OK) {
        tx_log(TX_LOG_ERROR, "[AC_OL_0007] KEY 누락");
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }
    if (tx_buf_getlong(ctx->in, "CAPAMT", &capamt) != TX_OK) {
        tx_log(TX_LOG_ERROR, "[AC_OL_0007] CAPAMT 누락");
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }

    strncpy(h_key, key, sizeof(h_key) - 1);
    h_key[sizeof(h_key) - 1] = '\0';

    EXEC SQL SELECT amount, merch_id, card_no, biz_date
          INTO :h_orig_amount, :h_merch_id, :h_card_no, :h_biz_date
          FROM ac_ledger
         WHERE key = :h_key;

    if (sqlca.sqlcode == TX_SQL_NOTFOUND) {
        tx_log(TX_LOG_WARN, "[AC_OL_0007] 원거래 없음 key=%s", key);
        tx_return(ctx, TX_ENOENT, ctx->out);
        return;
    }
    if (sqlca.sqlcode != TX_SQL_OK) {
        TX_DBIO_LOG_ERR("SELECT ac_ledger(부분매입대상)");
        tx_return(ctx, TX_EDB, ctx->out);
        return;
    }

    if (!amount_is_valid(capamt) || capamt > h_orig_amount) {
        tx_log(TX_LOG_WARN, "[AC_OL_0007] 부분금액 오류 cap=%ld orig=%ld",
               capamt, h_orig_amount);
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }

    h_cap_amount = capamt;
    h_remaining  = h_orig_amount - capamt;

    if (tx_begin() != TX_OK)
        tx_log(TX_LOG_WARN, "[AC_OL_0007] tx_begin 경고");

    EXEC SQL UPDATE ac_ledger
           SET amount = :h_remaining,
               upd_ts = now()
         WHERE key = :h_key;

    if (sqlca.sqlcode != TX_SQL_OK || sqlca.sqlerrd[2] != 1) {
        TX_DBIO_LOG_ERR("UPDATE ac_ledger(부분매입)");
        tx_abort();
        tx_return(ctx, TX_EDB, ctx->out);
        return;
    }

    /* 부분매입 내역키 = 원키 앞부분 13자 + "-P" (16바이트 한도 준수) */
    klen = strlen(h_key);
    if (klen > 13)
        klen = 13;
    memcpy(h_part_key, h_key, klen);
    h_part_key[klen] = '\0';
    strcat(h_part_key, "-P");
    strncpy(h_status, AC_ST_DONE, sizeof(h_status));

    EXEC SQL INSERT INTO ac_ledger
            (key, merch_id, card_no, amount, biz_date, status, fee,
             acq_type, orig_key)
        VALUES
            (:h_part_key, :h_merch_id, :h_card_no, :h_cap_amount, :h_biz_date,
             :h_status, 0, 'PART', :h_key);

    if (sqlca.sqlcode != TX_SQL_OK || sqlca.sqlerrd[2] != 1) {
        TX_DBIO_LOG_ERR("INSERT ac_ledger(부분매입내역)");
        tx_abort();
        tx_return(ctx, TX_EDB, ctx->out);
        return;
    }

    tx_commit();

    tx_buf_reset(ctx->out);
    tx_buf_sets(ctx->out, "KEY", key);
    tx_buf_setlong(ctx->out, "CAPAMT", capamt);
    tx_buf_setlong(ctx->out, "REMAINING", h_remaining);
    tx_log(TX_LOG_INFO, "[AC_OL_0007] 부분매입 완료 key=%s cap=%ld 잔여=%ld",
           key, capamt, h_remaining);
    tx_return(ctx, TX_OK, ctx->out);
}