#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <stdlib.h>

struct account
{
    char user[30];
    char password[30];
    char newpassword [30];
    int control;
};

int passwordIsLongEnough(char str[]) //kontrollerar längden på lösenordet
{
    int i;
    int counter = 0;
    int returnera;
    for(i=0; str[i] !='\0'; i++)
        counter++;
    if(counter < 8)
        returnera = 0;

    else
        returnera = 1;
    return returnera;
}

int passwordContainsDigit(char str[]) //kontrollerar om det finns en siffra i lösenordet
{
    int i;
    int digit = 0;
    int returnera;
    for(i=0; str[i] !='\0'; i++)

        if(isdigit(str[i]))
            digit++;
    if(digit > 0)
        returnera = 1;
    else
        returnera = 0;
    return returnera;
}

int passwordHasMixedCase(char str[]) //kontrollerar om det finns en stor och en liten bokstav i lösenordet
{
    int i;
    int returnera = 0;
    int upper = 0;
    int lower = 0;

    for(i=0; str[i] !='\0'; i++)
    {
        if(islower(str[i]))
            lower++;

        if(isupper(str[i]))
            upper++;

        if(upper > 0 && lower > 0)
            returnera = 1;

        else
            returnera = 0;
    }

    return returnera;
}

int isItIdentical(char str[])
{
    int i;
    int returnera = 0;
    int name;
    int password = 0;
    for(i=0; str[i] !='\0'; i++)
    {
        if((name = password))
            returnera = 0;
    }
    return returnera;
        }


int isSafePassword(char str[])
{
    int length;
    int digit;
    int upperlowercase;
    int returnera;
    int identical;
    length = passwordIsLongEnough(str);
    digit = passwordContainsDigit(str);
    upperlowercase = passwordHasMixedCase(str);
    identical = isItIdentical(str);

    if(length == 1 && digit == 1 && upperlowercase == 1)
    {
        returnera = 1;
    }

    else
    {
        returnera = 0;
    }

    if(length == 0)
        printf("Your password is not long enough\n");

    if(digit == 0)
        printf("Your password must contain at least one number\n");

    if(upperlowercase == 0)
        printf("Your password must contain one upper case letter and one lower case letter\n");

    if(identical==0)
        printf("Your password cannot be identical");

    return returnera;
}


struct account konto(void)
{
    struct account userAccount;
    printf("Enter username:\n");
    scanf("%s", userAccount.user);

    do
    {
        do
        {
            printf("Enter password:\n");
            scanf("%s", userAccount.password);
            userAccount.control = isSafePassword(userAccount.password);
        }
        while(userAccount.control == 0);
        printf("Confirm your password:\n");
        scanf("%s", userAccount.newpassword);

        if(strcmp(userAccount.password, userAccount.newpassword)==0)
            printf("Password confirmed\n");
        else
            printf("Passwords do not match\n");
    }
    while(strcmp(userAccount.password, userAccount.newpassword)!=0);
    return userAccount;

}


int main (void)
{
    int konton;
    int i;

    printf("How many useraccounts should be used?\n");
    scanf("%d", &konton);
    struct account*arr = (struct account*)malloc(sizeof(struct account)*konton);

    if(arr==NULL)
        printf("Not possible to allocate %d elements", konton);
    else
        for(i=0; i<konton; i++)
        {
            arr[i] = konto();
        }
    printf("Username: \t \t Password: \n");
    for (i=0; i<konton; i++)

        printf("%s \t \t %s \n", arr[i].user, arr[i].password);
    free(arr);

    return 0;

}