#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <ctype.h>
#include <errno.h>
#include <sys/wait.h>

int main(int argc, const char* argv[])
{
	if (argc > 2)
    {
		fprintf(stdout, "Bunu 152120151053 @atacankilic yazdi.\n");
        fprintf(stderr, "%s fazlasiyla arguman ile calistirildi, iptal ediliyor!\n", argv[0]);
        exit(0);
		
    if (argc < 2)
    {
		fprintf(stdout, "Bunu 152120151053 @atacankilic yazdi.\n");
        fprintf(stderr, "%s integer arguman ile calistirilmali, iptal ediliyor\n", argv[0]);
        exit(0);
    }
    
    }
    if (argc == 2)
    {
        if (atoi(argv[1]) < 2 || !isdigit(argv[1][0]))
        {
			fprintf(stdout, "Bunu 152120151053 @atacankilic yazdi.\n");
            fprintf(stderr, "Yanlis arguman. Derinlik degeri birden buyuk bir integer olmalidir (%d).\n", atoi(argv[1]));
            return 0;
        }
    }
	
    const int agacDerinligi = atoi(argv[1]);
    int geciciDerinlik = agacderinligi;
	
    int pidEbeveyn = getpid();
    int pid;
	
    while (geciciDerinlik--)
    {
        pid = fork();
		
        if ((geciciDerinlik + 1) == agacDerinligi)
        {
			
            if (pid == 0)
			
            {
                printf("----------logs/151053_uyg2A_logAll.log----------\n\n");
                system("[ -r logs/151053_uyg2A_logAll.log ] && cat logs/151053_uyg2A_logAll.log");
                printf("-----------------------------------\n\n");
                printf("-----------------------------------\n");
                sleep(2);
            }
            else
            {
                fprintf(stdout, "Process ID : %d, Parent Process ID : %d forked...\n", getpid(), getppid());
                fprintf(stdout, "will create logs/ folder 1 second later\n\n");
                sleep(1);
                system("mkdir -p logs && \
                        touch logs/151053_uyg2A_logAll.log && \
                        echo "" >> logs/151053_uyg2A_logAll.log && \
                        date >> logs/151053_uyg2A_logAll.log");
            }
        }
        else if ((pid != 0) || (pidEbeveyn == getpid()))
        {
            if (pid != 0) break;
            else if (pidEbeveyn == getpid())
            {
                pid_t child_two_pid = getpid();
                fprintf(stdout, "Process ID : %d, Parent Process ID : %d forked...\n", getpid(), getppid());
                break;
            }
        }
        else
        {
            fprintf(stdout, "Process ID : %d, Parent Process ID : %d forked...\n", getpid(), getppid());
        }
    }
    sleep(1);
    if (pidEbeveyn == getpid() && pid != 0)
    {
        char command[1024];
        sprintf(command, "  pstree -p %d && \
                            echo 'PID: %d depth: %d' >> logs/151053_uyg2A_logAll.log && \
                            pstree -p %d >> logs/151053_uyg2A_logAll.log && \
                            echo "" >> logs/151053_uyg2A_logAll.log",
            pidEbeveyn, pidEbeveyn, agacDerinligi, pidEbeveyn);
        system(command);
    }
	
    wait(NULL);
    int status;
    wait(&status);
    if (WIFEXITED(status)) printf("Process ID : %d, Parent Process ID : %d terminated... \n", getpid(), getppid());
	
    return 0;
}