#include "ucore/clock.h"
#include "ucore/utils.h"

#ifdef __GNUC__
#define UNUSED __attribute__((__unused__))
#else
#define UNUSED
#endif

static void uc_timeofday_now(const struct UCoreClock *uclock UNUSED, struct timeval *tv)
{
    gettimeofday(tv, NULL);
}

static void uc_time_now(const struct UCoreClock *uclock UNUSED, struct timeval *tv)
{
    tv->tv_sec = time(NULL);
    tv->tv_usec = 0;
}

struct UCoreClock uc_timeofday_clock = {
    .name = "gettimeofday",
    .now = uc_timeofday_now,
};

struct UCoreClock uc_time_clock = {
    .name = "time",
    .now = uc_time_now,
};

static void uc_cached_clock_now(const struct UCoreClock *uclock,
                                    struct timeval *tv)
{
    const struct UCoreCachedClock *cached_clock;
    cached_clock = UC_CONST_CONTAINER_OF(uclock, const struct UCoreCachedClock, clock),

    *tv = cached_clock->cache;
}

void uc_cached_clock_init(struct UCoreCachedClock *uclock, struct UCoreClock *real_clock)
{
    uclock->clock.name = "cached clock";
    uclock->clock.now = uc_cached_clock_now;

    uclock->real_clock = real_clock;

    uc_cached_clock_update(uclock);
}

void uc_cached_clock_update(struct UCoreCachedClock *uclock)
{
    uclock->real_clock->now(&uclock->clock, &uclock->cache);
}

static void uc_settable_clock_now(const struct UCoreClock *uclock, struct timeval *tv)
{
    const struct UCoreSettableClock *cached_clock;
    cached_clock = UC_CONST_CONTAINER_OF(uclock, const struct UCoreSettableClock, clock),

    *tv = cached_clock->now;
}

void uc_settable_clock_init(struct UCoreSettableClock *uclock)
{
    uclock->clock.name = "settable clock";
    uclock->clock.now = uc_settable_clock_now;

    uclock->now.tv_sec = 0;
    uclock->now.tv_usec = 0;
}

void uc_settable_clock_set_tv(struct UCoreSettableClock *uclock, const struct timeval *tv)
{
    uclock->now = *tv;
}

void uc_settable_clock_set(struct UCoreSettableClock *uclock, time_t secs, suseconds_t usecs)
{
    uclock->now.tv_sec = secs;
    uclock->now.tv_usec = usecs;
}