#include <time.h>
#include <stdio.h>
#include <temperature.h>

struct crontask {
	void (*run)();
	int last_run; // Number of seconds after start to wait until running
	int interval;
};

#define TASKCOUNT 3
static struct crontask tasks[TASKCOUNT] = {
	{&temperature_update_sisa, 0, 60},
	{&humidity_update_sisa, 15, 60},
	{&temperature_update_ulko, 30, 60}
};

/* Public functions */

void cron_initialize() {
	int i;
	for (i = 0; i < TASKCOUNT; i++) {
		tasks[i].last_run += time(NULL) - tasks[i].interval;
	}
}

int cron_runtasks() {
	// Returns time of next event
	
	int i;
	int nextevent = -1;
	
	for (i = 0; i < TASKCOUNT; i++) {
		if (tasks[i].last_run + tasks[i].interval <= time(NULL)) {
			tasks[i].last_run = time(NULL);
			tasks[i].run();
		}
		
		int ne = tasks[i].last_run + tasks[i].interval;
		if (nextevent < 0 || ne < nextevent)
			nextevent = ne;
	}
	
	if (nextevent < 0)
		fprintf(stderr, "Nothing to run!\n");
	
	return nextevent;
}