/*
 * py_stat_batch.pgc - py 집중 가맹점 통계 (GROUP BY HAVING 서브쿼리 배치, XA).
 *
 * Counts merchants whose daily payout amount clears a threshold using a single
 * GROUP BY ... HAVING subquery, under ONE XA transaction.
 * Usage: py_stat_batch [YYYY-MM-DD] [THRESHOLD]
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <atmi.h>
#include "py_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_thr, h_merchants;
    EXEC SQL END DECLARE SECTION;

    strncpy(h_bizdate, bizdate, sizeof(h_bizdate)-1); h_bizdate[sizeof(h_bizdate)-1] = 0;
    h_thr = (argc > 2) ? atol(argv[2]) : 1000000;

    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 count(*) INTO :h_merchants FROM (
        SELECT merchant_id FROM py_payout WHERE biz_date = :h_bizdate
        GROUP BY merchant_id HAVING coalesce(sum(net),0) >= :h_thr) t;
    if (sqlca.sqlcode < 0) { fprintf(stderr, "py_stat_batch FAIL [%d] %s\n", sqlca.sqlcode, sqlca.sqlerrm.sqlerrmc); tpabort(0); return 1; }

    if (tpcommit(0) < 0) { fprintf(stderr, "tpcommit FAIL: %s\n", tpstrerror(tperrno)); tpabort(0); return 1; }
    printf(">>> py_stat_batch COMMIT: bizdate=%s threshold=%ld top_merchants=%ld\n", bizdate, h_thr, h_merchants);

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