/* monotonic_test.c — 宿主验证 ncm_now_ms(REALTIME) 与 ncm_monotonic_ms(MONOTONIC)。
 * 演示：用墙钟算 deadline 在「NTP 拨钟回退 Δ」时，(deadline-now) 被放大成巨大 rem；
 * 用单调钟则不受影响（每次至多等剩余 deadline）。
 */
#include "ncm.h"
#include "ncm_common.h"
#include <stdio.h>
#include <unistd.h>

int main(void) {
    int64_t w0 = ncm_now_ms();
    int64_t m0 = ncm_monotonic_ms();
    usleep(50 * 1000);
    int64_t w1 = ncm_now_ms();
    int64_t m1 = ncm_monotonic_ms();
    printf("REALTIME  advance: %lld ms\n", (long long)(w1 - w0));
    printf("MONOTONIC advance: %lld ms\n", (long long)(m1 - m0));
    if (w1 <= w0 || m1 <= m0) { printf("FAIL: clock not advancing\n"); return 1; }

    /* 模拟 NTP 把墙钟拨回 Δ=6h 后，(deadline-now) 的变化 */
    int64_t base_w = w0;
    int64_t base_m = m0;
    int64_t tmo = 15000;
    int64_t dline_w = base_w + tmo, dline_m = base_m + tmo;
    int64_t jump = 6 * 3600 * 1000;   /* 拨回 6 小时 */

    /* REALTIME：now 回退 jump → rem 巨大 */
    int64_t now_w = base_w - jump;
    uint32_t rem_w = (uint32_t)(dline_w - now_w);
    /* MONOTONIC：now 不受跳变影响 */
    int64_t now_m = base_m;
    uint32_t rem_m = (uint32_t)(dline_m - now_m);
    printf("REALTIME  rem after -6h jump = %u ms (%.1f h)\n", rem_w, rem_w / 3600000.0);
    printf("MONOTONIC rem after -6h jump = %u ms (%.2f s)\n", rem_m, rem_m / 1000.0);
    if (rem_w > rem_m) printf("OK: REALTIME overflow confirmed, MONOTONIC unaffected\n");
    else { printf("FAIL: expected REALTIME rem to blow up\n"); return 1; }
    return 0;
}