#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <ctype.h>
#include <time.h>
#include <string.h>
#include <sys/wait.h>
#define BUFFER 1024
int main(int argc, const char* argv[])
{
    if (argc < 2)//parametrelerin dogru girilip girilmediginin kontorlu
    {
        fprintf(stderr, "%s must be executed with an argument!\n", argv[0]);
        fprintf(stdout, "Aborted automatically...\n");
        exit(0);
    }
    if (argc > 2)//parametrelerin dogru girilip girilmediginin kontorlu
    {
        fprintf(stderr, "%s was executed with too many arguments!\n", argv[0]);
        fprintf(stdout, "Aborted automatically...\n");
        exit(0);
    }
    if (argc == 2)//parametrelerin dogru girilip girilmediginin kontorlu
    {
        if (!isdigit(argv[1][0]) || atoi(argv[1]) < 2)//girilen parametrenin int olup olmadigi ve derinlik kontolu
        {
            fprintf(stderr, "Wrong argument! Depth value must be an integer greater than one (%d).\n", atoi(argv[1]));
            fprintf(stdout, "Aborted automatically...\n");
            return 0;
        }
    }
    const int depth = atoi(argv[1]);//derinlik int'e cevrilip bir degiskende tutuluyor
    int level = depth;//dongude karsilastirmak adina derinlik bir baska degere esitleniyor
    pid_t top_parent_pid = getpid();//root parent id'si
    pid_t pid;//dongude kullanmak icin bir pid_t tanimliyoruz
    while (level--)//derinlik kadar donguyu dondurmek icin level'i birer azaltıyoruz
	for(int i = level ; 0>i;i--)
    {
        pid = fork();
        if ((level + 1) == depth)//dongu baslangicinda level-- ile basladigi icin derinligi level+1 ile kontrol ediyoruz
        {
            if (pid == 0)//log dosyalarini terminale yazdiriyoruz
            {
                printf("----------logs/151068_uyg2A_logAll.log----------\n\n");
                system("[ -r logs/151068_uyg2A_logAll.log ] && cat logs/151068_uyg2A_logAll.log");
                printf("-----------------------------------\n\n");
                printf("-----------------------------------\n");
                sleep(2);
            }
            else
            {
                fprintf(stdout, "Process ID : %d, Parent Process ID : %d forked...\n", getpid(), getppid());//parent process'in terminale yazdirilmasi
                fprintf(stdout, "will create logs/ folder 1 second later\n\n");
                sleep(1);//bu satirdan sonraki satirda log dosyasinin olusturulmasi vardir
                system("mkdir -p logs && \
                        touch logs/151068_uyg2A_logAll.log && \
                        echo "" >> logs/151068_uyg2A_logAll.log && \
                        date >> logs/151068_uyg2A_logAll.log");
            }
        }
        else if ((pid != 0) || (top_parent_pid == getpid()))
        {
            if (pid != 0) break;
            else if (top_parent_pid == getpid())
            {
                pid_t child_two_pid = getpid();//child 2 process(tek bir kez uretilecek cocuk)
                fprintf(stdout, "Process ID : %d, Parent Process ID : %d forked...\n", getpid(), getppid());//child 2 nin terminale yazdirilmasi
                break;
            }
        }
        else//grandchild'in id'sinin terminale yazdirilmasi
        {
            fprintf(stdout, "Process ID : %d, Parent Process ID : %d forked...\n", getpid(), getppid());
        }
    }
    sleep(1);
    if (top_parent_pid == getpid() && pid != 0)//pstree'nin terminale ve log dosyasina yazilmasi
    {
        char command[BUFFER];
        sprintf(command, "  pstree -p %d && \
                            echo 'PID: %d depth: %d' >> logs/151068_uyg2A_logAll.log && \
                            pstree -p %d >> logs/151068_uyg2A_logAll.log && \
                            echo "" >> logs/151068_uyg2A_logAll.log",
            top_parent_pid, top_parent_pid, depth, top_parent_pid);
        system(command);
    }
    wait(NULL);
    int status;
    wait(&status);
    if (WIFEXITED(status)) printf("Process ID : %d, Parent Process ID : %d terminated... \n", getpid(), getppid());//butun processlerin terminate edilmesi
    return 0;
}