#ifndef NTP_TIME_H
#define NTP_TIME_H

#include <stdint.h>
#include <time.h>
#include "../lib/platform_compat.h"

#ifdef __cplusplus
extern "C" {
#endif

struct UTUN_INSTANCE;

#define NTP_DEFAULT_INTERVAL_SEC 3600
#define NTP_FIRST_SYNC_DELAY_SEC 0

struct NTP_TIME {
    int enabled;
    int synced;
    int64_t offset_us;       // local_time - ntp_time (positive = local clock ahead)
    uint64_t last_sync_tb;   // monotonic time of last successful sync (0.1ms units)
    void* timer;             // uasync timer handle
    char **servers;          // dynamic array, allocated at init
    int server_count;
    int server_current;
    int resync_interval_sec;
    struct sockaddr_in test_addr; // test mode: direct address when sin_port != 0
};

int ntp_time_init(struct UTUN_INSTANCE* instance);
void ntp_time_destroy(struct UTUN_INSTANCE* instance);

void ntp_time_set_test_addr(struct NTP_TIME* ntp, const char* ip, uint16_t port);

int64_t ntp_time_get_us(struct UTUN_INSTANCE* instance);
time_t ntp_time_get_seconds(struct UTUN_INSTANCE* instance);
int ntp_time_is_synced(struct UTUN_INSTANCE* instance);

#ifdef __cplusplus
}
#endif

#endif // NTP_TIME_H