store_poll.h

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#pragma once
#include <pebble.h>
#include <time.h>


static inline time_t store_poll_next(int poll_min, time_t now)
{
    time_t interval = (time_t)poll_min * SECONDS_PER_MINUTE;
    return ((now / interval) + 1) * interval;
}

static inline bool store_poll_due(int poll_min, time_t *next, time_t now)
{
    if (poll_min <= 0)
    {
        return false;
    }
 
    time_t interval = (time_t)poll_min * SECONDS_PER_MINUTE;
    if (*next > now + interval)
    {
        *next = store_poll_next(poll_min, now);
    }
 
    if (now < *next)
    {
        return false;
    }
 
    *next = store_poll_next(poll_min, now);
    return true;
}

static inline bool store_poll_reconnect_due(int age_s, int poll_min)
{
    if (poll_min <= 0)
    {
        return false;
    }
    // a clock set back makes a saved reading's age negative too, so it reads as never arrived and the
    // reconnect asks again. the first answer resets the age, and a reconnect means the phone is there
    // to give one, so it costs about one fetch. counting that age as fresh instead would skip every
    // reconnect fetch until the clock caught up, which can be hours
    return age_s < 0 || age_s >= poll_min * SECONDS_PER_MINUTE;
}

typedef struct
{
    time_t next;     
    int    poll_min; 
    bool   live;     
} StorePoll;

bool store_poll_set(StorePoll *poll, int poll_min, bool live, time_t now);

bool store_poll_turn(StorePoll *poll, time_t now);