#define _GNU_SOURCE
#define DEFAULT_QUOTA_SIZ 1048576

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <dirent.h>
#include <errno.h>

 typedef struct msg{
    char *destination;
    char *subject;
    char *text;
}message;

/* User Data.
 * It contains all data stored of an user.
 */
typedef struct userData{
    char *username;
    char *password;
    long int nMessages;
    long int bytes_quota;
    message *msgs;
}user;

int addUser(char *username, user *users, int nAccounts){
    char *path;
    FILE *fp;
    int i,last;
    last=nAccounts-1;
    users[last].username=malloc(BUFSIZ);
    users[last].password=malloc(BUFSIZ);

    users[last].username=username;
    printf(" ___ADD_USER___\n");
    for(i=0;i<(nAccounts);i++){
        printf("username: %s\npassword: %s\nbytes_quota: %ld\nnMessages: %ld\n", users[i].username, users[i].password, users[i].bytes_quota, users[i].nMessages);
    }

    printf("Insert a password for the '%s' account: \n",users[last].username);
    scanf("%s",users[last].password);
    for(i=0;i<nAccounts;i++){
        printf("username: %s\npassword: %s\nbytes_quota: %ld\nnMessages: %ld\n", users[i].username, users[i].password, users[i].bytes_quota, users[i].nMessages);
    }
    printf("non arrivo qui-");
    users[last].bytes_quota=DEFAULT_QUOTA_SIZ; /* default quota: 1MB */
    printf("non arrivo qui-");
    path="dir/";
    /* Creating user mailbox file */
    sprintf(path,"%s",username);
    fp=fopen(path, "w");
        if(fp==NULL){
            perror("user file creation");
            return EXIT_FAILURE;
        }
    fwrite(&users[last],sizeof(user),1,fp);
    fclose(fp);

    /* Updating 'usrs' file with the new user */
    fp=fopen("dir/usrs", "a");
    if(fp==NULL){
        perror("user file creation");
        return EXIT_FAILURE;
    }
    fprintf(fp,"%s",username);
    fclose(fp);
    return EXIT_SUCCESS;
}