//Used for basic input/output stream
#include <stdio.h>
//Used for handling directory files
#include <dirent.h>
//For EXIT codes and error handling
#include <errno.h>
#include <stdlib.h>

void _ls(const char *dir,int op_a,int op_l)
{
	//Here we will list the directory
	struct dirent *d;
	DIR *dh = opendir(dir);
	if (!dh)
	{
		if (errno = ENOENT)
		{
			//If the directory is not found
			perror("Directory doesn't exist");
		}
		else
		{
			//If the directory is not readable then throw error and exit
			perror("Unable to read directory");
		}
		exit(EXIT_FAILURE);
	}
	//While the next entry is not readable we will print directory files
	while ((d = readdir(dh)) != NULL)
	{
		//If hidden files are found we continue
		if (!op_a && d->d_name[0] == '.')
			continue;
		printf("%s  ", d->d_name);
		if(op_l) printf("\n");
		if(d->d_type == DT_REG)
			printf("directory\n");
		else
			printf("file\n");
	}
	if(!op_l)
	printf("\n");
}
int main(int argc, const char *argv[])
{
	if (argc == 1)
	{
		_ls("KAL1",0,0);
	}
	else if (argc == 2)
	{
		if (argv[1][0] == '-')
		{
			//Checking if option is passed
			//Options supporting: a, l
			int op_a = 0, op_l = 0;
			char *p = (char*)(argv[1] + 1);
			while(*p){
				if(*p == 'a') op_a = 1;
				else if(*p == 'l') op_l = 1;
				else{
					perror("Option not available");
					exit(EXIT_FAILURE);
				}
				p++;
			}
			_ls(".",op_a,op_l);
		}
	}
	return 0;
}