#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <time.h>
#include <fcntl.h>

/*
 * -t float
 * -s text
 * -d int
 **/
char *str;

struct timespec t_spec;

void timeToStruct(float whole_secs){
    int sec;
    float nsec;
    sec = whole_secs;
    nsec = whole_secs - sec;

    t_spec.tv_sec = sec;
    t_spec.tv_nsec = nsec*1000000000;
}


void parse_args(int argc, char **argv){
    int opt, desc;
    float timeArg;
    char *descriptor;

    while((opt = getopt(argc, argv,"t:s:d:"))!= -1){
        switch(opt){
            case 't':
                timeArg = strtod(optarg, NULL);
                timeToStruct(timeArg);
                printf("%d %.9ld\n", t_spec.tv_sec, t_spec.tv_nsec);
            break;
            case 's':
                str = malloc(strlen(optarg));
                strcpy(str,optarg);
                for(int i = 0; i<strlen(optarg); i++){
                    printf("%c", str[i]);
                }
            break;
            case 'd':
                descriptor = malloc(strlen(optarg));
                strcpy(descriptor, optarg);
                for(int counter = 0; counter<strlen(optarg); counter++){
                    if(descriptor[counter] < '0' || descriptor[counter] > '9'){
                        printf("not a number\n");
                        exit(0);
                    }
                }
                desc = atoi(descriptor);
                printf("%d\n", desc);
            break;
            default:
            break;
        }
    }
}

void progDeathRand(){
    int r = 0;
    srand(time(NULL));
    while( 1 ){
        r = rand()%100;
        printf("sleep %d\n", r);
        if(r < 50){
            printf("should exit\n");
            exit(0);
        }
        nanosleep(&t_spec, NULL);
    }
}


void main(int argc, char **argv){
    if(argc != 7){
        printf("USAGE: %s -t <f> -s <string> -d <int[0-2]>\n",argv[0]);
        exit(0);
    }

    parse_args(argc, argv);
    FILE* file;
    file = fopen("./startup", "w+");
    if(file == -1){
        perror("open:");
    }
    close(file);

    //progDeathRand()   ;

}


/*  if(pipe(pipefd) == -1){
        perror("pipe");
        exit(0);
    }

    c_pid = fork();
    if(c_pid == 0){
        close(pipefd[0]);
        while(write(pipefd[1], str, sizeof(str))){
            nanosleep(&t_spec, NULL);
        }
    }
    if(c_pid < 0){
        perror("fork:");
        exit(0);
    }
    else{
        close(pipefd[1]);
        while(read(pipefd[0], readBuffer, sizeof(readBuffer))){
            printf("Received string: %s", readBuffer);
        }
    }

    //


}*/