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

struct crontask {
	void (*run)();
	int last_run; // 0: run immediately on start, -1: run interval seconds after start
	int interval;
};

#define TASKCOUNT 4
static struct crontask tasks[TASKCOUNT] = {
	{&traffic_updatetotal, 0, 10},
	{&traffic_writetotal, -1, 3600},
	{&traffic_updatespeeds, 0, 2},
	{&temperature_update, 0, 60}
};

/* Public functions */

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

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;
}