#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>

typedef struct entry
{
	char *surname;
	char *name;
} entry_t;

void data_create(char *filename);
void pos_create(char *filename);
void data_insert(char *filename, char entry);
void pos_insert(char *filename, int num_of_bytes, int pos);
void delete_data(char *filename);
int bin_search(int total, int x);
void display_data(char *filename);



int main(int argc, char*argv[])
{
	data_create("data.bin");
	pos_create("pos.bin");




}

void data_create(char *filename)
{
   int fd1;

   if ((fd1 = open(filename, O_CREAT| O_RDWR | O_TRUNC | O_APPEND | O_EXCL, S_IRWXU)) == -1) {
		write(2,"file error...\n",20);
		_exit(1);

	}
	close(fd1);


}

void pos_create(char *filename)
{
   int fd2;
   if ((fd2 = open(filename, O_CREAT| O_RDWR | O_TRUNC | O_APPEND | O_EXCL, S_IRWXU)) == -1) {
      write(2,"file error...\n",20);
		_exit(1);

	}
	close(fd2);
}

void data_insert(char *filename, char entry)
{
	int fd1;
	if((fd1 = open(filename, O_CREAT| O_RDWR | O_TRUNC | O_APPEND | O_EXCL, S_IRWXU)) == -1) {
		write(2,"file error...\n",20);
		_exit(1);
	}

	lseek(fd1, 0, SEEK_END);

	write(fd1, &entry, sizeof(char));
	close(fd1);
}

void pos_insert(char *filename, int num_of_bytes, int pos)
{
	int i;
	int filesize;
	int fd2;

	if((fd2 = open(filename, O_CREAT| O_RDWR | O_TRUNC | O_APPEND | O_EXCL, S_IRWXU)) == -1) {
		write(2,"file error...\n",20);
		_exit(1);
	}

	lseek(fd2, pos*sizeof(char), SEEK_SET);
	//filesize = strlen??

}
int bin_search(int total, int x)
{
	char left, right, mid;

	mid = (left + right) / 2;

	if(left>right)
	return -1;

	if(x==mid)
	return mid;

	if(x>mid)
	{
		x*=1,5; //giati thelw to miso tou misou apo deksia px an exw total=100 -> mid=50 -> mid tou mid=75 (50*1,5)
		return x;
	}

	if(x<mid)
	{
		x*=0,5; //giati thelw to miso tou misou apo aristera px an exw total=100 -> mid=50 ->mid tou mid=25
		return x;
	}



}


void delete_data(char *filename)
{
	entry_t en;

    int fd1;
    int n,i;
    char size[n];
    write(1,"Give a surname and a name",n);
    for(i=0; i<n; i++)
    {
        size[i]= read(fd1,&size,sizeof(char));
    }
   //remove() na brw lower entolh

}

void display_data(char *filename)
{
	int fd1;
	char c;
	if(fd1 == NULL)
	{
		write(2, "cannot open file\n", 20);
		_exit(1);
	}
	c = read(1, fd1, sizeof(char));

	while(c != EOF) //ti sto dialo einai sto <stdio.h> kai den to anagnwrizei?
	{
		write(2, &c, sizeof(char));

	}
	close(fd1);

}