#include <patty/timer.h>

int patty_timer_running(patty_timer *timer) {
    return (timer->flags & PATTY_TIMER_RUNNING)? 1: 0;
}

int patty_timer_expired(patty_timer *timer) {
    return (timer->flags & PATTY_TIMER_RUNNING) && timer->t.tv_sec <= 0? 1: 0;
}

void patty_timer_clear(patty_timer *timer) {
    timer->t.tv_sec  = 0;
    timer->t.tv_usec = 0;

    timer->flags &= ~PATTY_TIMER_RUNNING;
}

void patty_timer_start(patty_timer *timer,
                       time_t ms) {
    timer->t.tv_sec  =  ms / 1000;
    timer->t.tv_usec = (ms % 1000) * 1000;

    timer->flags |= PATTY_TIMER_RUNNING;
}

void patty_timer_stop(patty_timer *timer) {
    timer->flags &= ~PATTY_TIMER_RUNNING;
}

void patty_timer_tick(patty_timer *timer,
                      struct timeval *elapsed) {
    struct timeval res;

    if (!(timer->flags & PATTY_TIMER_RUNNING)) {
        return;
    }

    timersub(&timer->t, elapsed, &res);

    timer->t.tv_sec  = res.tv_sec;
    timer->t.tv_usec = res.tv_usec;
}