#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include <unistd.h>
#include <errno.h>

/* define aby strptime nie krzyczało */
/* http://stackoverflow.com/questions/15334558/compiler-gets-warnings-when-using-strptime-function-c */
#define		__USE_XOPEN
#define		_GNU_SOURCE

void simple_run(char **command) {
    pid_t pid = fork();
    if (pid == -1) {
        fprintf(stderr, "Can't fork, error %d\n", errno);
        exit(1);
    }
    if (pid == 0) {
        execvp(command[1],command+1);
        printf("Unkown command\n");
        exit(0);
    }
}

int main(int argc, char *argv[]) {
	struct tm *planned;
	time_t p_rawtime;

	time(&p_rawtime);
	planned = localtime(&p_rawtime);

	/* "parsowanie" godziny */
	//sscanf(argv[1],"%d:%d:%d",&planned->tm_hour,
	//		&planned->tm_min,&planned->tm_sec);
	strptime(argv[1], "%H:%M:%S",planned);
	p_rawtime = mktime(planned);

	double diff_secs;
	while(1) {
		diff_secs = difftime(p_rawtime,time(NULL));			/* ile sekund do "deadline" :) */
		if(diff_secs<0) {									/* sprawdzamy czy termin nie minął */
			planned->tm_mday++;								/* dzień++ - lec do nast dnia */
			p_rawtime = mktime(planned);
			//printf(ctime(&p_rawtime));
			diff_secs=difftime(p_rawtime,time(NULL));		/* ile teraz sekund do "deadline" ? */
		}
		//printf("ide spac na %.0lf sekund\n",diff_secs);
		sleep(diff_secs);
		//printf("wykonuje komende\n");
		simple_run(argv+1);
		sleep(1);											/* aby nie wykonalo sie kilka razy w sekunde */
	}
	return 0;
}