/*
 * cm_fxspread_batch.pgc - cm 환율 최대/최소/평균 분포 집계 배치 (XA).
 *
 * ATMI client: tpinit/tpopen open the ECPG XA RM, tpbegin starts ONE global
 * transaction; 기준일 환율의 max/min/avg(3개 집계, avg 는 CAST ... AS BIGINT)
 * 를 한 행으로 뽑아 C 에서 스프레드(max-min)를 계산; then tpcommit.
 * Usage: cm_fxspread_batch [YYYY-MM-DD]
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <atmi.h>
#include "cm_dbio.h"

int main(int argc, char **argv)
{
    const char *bizdate = (argc > 1) ? argv[1] : "2026-07-19";
    EXEC SQL BEGIN DECLARE SECTION;
    char h_bizdate[16];
    long h_max = 0, h_min = 0, h_avg = 0, h_spread = 0;
    EXEC SQL END DECLARE SECTION;

    strncpy(h_bizdate, bizdate, sizeof(h_bizdate)-1); h_bizdate[sizeof(h_bizdate)-1] = 0;

    if (tpinit(NULL) < 0) { fprintf(stderr, "tpinit FAIL: %s\n", tpstrerror(tperrno)); return 1; }
    if (tpopen() < 0)     { fprintf(stderr, "tpopen FAIL: %s\n", tpstrerror(tperrno)); return 1; }
    if (tpbegin(60, 0) < 0) { fprintf(stderr, "tpbegin FAIL: %s\n", tpstrerror(tperrno)); return 1; }

    EXEC SQL SELECT coalesce(max(rate_bps),0), coalesce(min(rate_bps),0),
                    CAST(coalesce(avg(rate_bps),0) AS BIGINT)
        INTO :h_max, :h_min, :h_avg FROM cm_fx_rate WHERE base_date = :h_bizdate;
    if (sqlca.sqlcode < 0) { fprintf(stderr, "cm_fxspread_batch FAIL [%d] %s\n", sqlca.sqlcode, sqlca.sqlerrm.sqlerrmc); tpabort(0); return 1; }
    h_spread = h_max - h_min;

    if (tpcommit(0) < 0) { fprintf(stderr, "tpcommit FAIL: %s\n", tpstrerror(tperrno)); tpabort(0); return 1; }
    printf(">>> cm_fxspread_batch COMMIT: bizdate=%s max=%ld min=%ld avg=%ld spread=%ld\n", bizdate, h_max, h_min, h_avg, h_spread);

    tpclose(); tpterm();
    return 0;
}
